Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to ... · General Description The MAX4012 single, MAX4016 dual, MAX4018 triple, and MAX4020 quad op amps are unity-gain-stable

General DescriptionThe MAX4012 single, MAX4016 dual, MAX4018 triple,and MAX4020 quad op amps are unity-gain-stabledevices that combine high-speed performance with Rail-to-Rail outputs. The MAX4018 has a disable feature thatreduces power-supply current to 400µA and places itsoutputs into a high-impedance state. These devicesoperate from a 3.3V to 10V single supply or from ±1.65Vto ±5V dual supplies. The common-mode input voltagerange extends beyond the negative power-supply rail(ground in single-supply applications).These devices require only 5.5mA of quiescent supplycurrent while achieving a 200MHz -3dB bandwidth anda 600V/µs slew rate. These parts are an excellent solu-tion in low-power/low-voltage systems that require widebandwidth, such as video, communications, and instru-mentation. In addition, when disabled, their high-outputimpedance makes them ideal for multiplexing applications.The MAX4012 comes in a miniature 5-pin SOT23 and 8-pin SO package, while the MAX4016 comes in 8-pinµMAX® and SO packages. The MAX4018/MAX4020 areavailable in a space-saving 16-pin QSOP, as well as a14-pin SO.

ApplicationsSet-Top BoxesSurveillance Video SystemsBattery-Powered InstrumentsVideo Line DriverAnalog-to-Digital Converter InterfaceCCD Imaging SystemsVideo Routing and Switching Systems

____________________________Features♦ Low-Cost

♦ High Speed:200MHz -3dB Bandwidth (MAX4012)150MHz -3dB Bandwidth(MAX4016/MAX4018/MAX4020)30MHz 0.1dB Gain Flatness600V/µs Slew Rate

♦ Single 3.3V/5.0V Operation

♦ Rail-to-Rail Outputs

♦ Input Common-Mode Range Extends Beyond VEE

♦ Low Differential Gain/Phase: 0.02%/0.02°

♦ Low Distortion at 5MHz:-78dBc SFDR-75dB Total Harmonic Distortion

♦ High-Output Drive: ±120mA

♦ 400µA Shutdown Capability (MAX4018)

♦ High-Output Impedance in Off State (MAX4018)

♦ Space-Saving SOT23, SO, µMAX, or QSOPPackages

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20

Low-Cost, High-Speed, Single-SupplyOp Amps with Rail-to-Rail Outputs

________________________________________________________________ Maxim Integrated Products 1

VEE

IN-IN+

1 5 VCCOUT

MAX4012

SOT23-5

TOP VIEW

2

3 4

OUTIN+

N.C.VEE

1

2

8

7

N.C.

VCCIN-

N.C.

SO

3

4

6

5

MAX4012

Pin Configurations

RO50Ω

IN

VOUTZO = 50Ω

UNITY-GAIN LINE DRIVER(RL = RO + RTO)

RF24Ω

RTO50Ω

RTIN50Ω

MAX4012

Typical Operating Circuit

19-1246; Rev 3; 8/04

Ordering Information

Ordering Information continued at end of data sheet.

Pin Configurations continued at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

PARTTEMP

RANGEPIN-PACKAGE

5 SOT23-5MAX4012EUK-T -40°C to +85°C

TOPMARK

ABZP

8 SOMAX4012ESA -40°C to +85°C —

8 SOMAX4016ESA -40°C to +85°C —

8 µMAXMAX4016EUA -40°C to +85°C —

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, EN_ = 5V, RL = ∞ to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Supply Voltage (VCC to VEE) ..................................................12VIN_-, IN_+, OUT_, EN_ .....................(VEE - 0.3V) to (VCC + 0.3V)Output Short-Circuit Duration to VCC or VEE............. ContinuousContinuous Power Dissipation (TA = +70°C)

5-Pin SOT23 (derate 7.1mW/°C above +70°C) ...........571mW8-Pin SO (derate 5.9mW/°C above +70°C) .................471mW

8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW14-Pin SO (derate 8.3mW/°C above +70°C) ...............667mW16-Pin QSOP (derate 8.3mW/°C above +70°C) ..........667mW

Operating Temperature Range ...........................-40°C to +85°CStorage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°C

Guaranteed by CMRR test

(VEE - 0.2V) ≤ VCM ≤ (VCC - 2.25V)

Any channels for MAX4016/MAX4018/MAX4020

(Note 2)

(Note 2)

Differential mode (-1V ≤ VIN ≤ +1V)

CONDITIONS

µV/°C8TCVOSInput Offset VoltageTemperature Coefficient

mV4 20VOS

VVEE - VCC -0.20 2.25

VCMInput Common-Mode Voltage Range

Input Offset Voltage (Note 2)

dBAVOLOpen-Loop Gain (Note 2)

dB70 100CMRRCommon-Mode Rejection Ratio

mV±1Input Offset Voltage Matching

µA5.4 20IBInput Bias Current

µA0.1 20IOSInput Offset Current

kΩ70RINInput Resistance

UNITSMIN TYP MAXSYMBOLPARAMETER

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or at any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposureto absolute maximum rating conditions for extended periods may affect device reliability.

Common mode (-0.2V ≤ VCM ≤ +2.75V) MΩ3

0.25V ≤ VOUT ≤ 4.75V, RL = 2kΩ 61

0.5V ≤ VOUT ≤ 4.5V, RL = 150Ω 52 59

1.0V ≤ VOUT ≤ 4V, RL = 50Ω 57

VVOUTOutput Voltage Swing(Note 2)

RL = 2kΩ0.06

0.06

RL = 150Ω0.30

0.30

0.6 1.5

0.6 1.5

VCC - VOH

VOL - VEE

VCC - VOH

VOL - VEE

VCC - VOH

VOL - VEERL = 75Ω

RL = 75Ωto ground

1.1 2.0VCC - VOH

0.05 0.50VOL - VEE

±70 ±120

±150

8

Sinking or sourcing

ROUT

ISC

Open-Loop Output Resistance

Output Short-Circuit Current

ΩmA

mAOutput Current±60

RL = 20Ω to VCC orVEE

IOUTTA = +25°C

TA = TMIN to TMAX

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)(VCC = 5V, VEE = 0, EN_ = 5V, RL = ∞ to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

VCC = 5V, VEE = 0, VCM = 2.0V

VCC = 5V, VEE = -5V, VCM = 0

VCC to VEE

CONDITIONS

dB

46 57

PSRRPower-Supply Rejection Ratio(Note 3)

54 66

V3.15 11.0VSOperating Supply-VoltageRange

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC = 3.3V, VEE = 0, VCM = 0.90V 45

EN_ = 0, 0 ≤ VOUT ≤ 5V (Note 4) kΩ28 35ROUT (OFF)Disabled Output Resistance

VVCC - 2.6VILEN_ Logic-Low Threshold

VVCC - 1.6VIHEN_ Logic-High Threshold

0.5

EN_ = 5V µA0.5 10IIHEN_ Logic Input High Current

EnabledmA

5.5 7.0IS

Quiescent Supply Current (per Amplifier) MAX4018, disabled (EN_ = 0) 0.40 0.65

(VEE + 0.2V) ≤ EN_ ≤ VCCµA

200 400IILEN_ Logic Input Low Current

EN_ = 0

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


4 _______________________________________________________________________________________

Note 1: The MAX4012EUT is 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed bydesign.

Note 2: Tested with VCM = 2.5V.Note 3: PSR for single 5V supply tested with VEE = 0, VCC = 4.5V to 5.5V; for dual ±5V supply with VEE = -4.5V to -5.5V,

VCC = 4.5V to 5.5V; and for single 3.3V supply with VEE = 0, VCC = 3.15V to 3.45V.Note 4: Does not include the external feedback network’s impedance.Note 5: Guaranteed by design.

AC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, VCM = 2.5V, EN_ = 5V, RF = 24Ω, RL = 100Ω to VCC/2, VOUT = VCC/2, AVCL = 1, TA = +25°C, unless otherwisenoted.)

PARAMETER SYMBOL MIN TYP MAX UNITS

Bandwidth for 0.1dB GainFlatness

BW0.1dB 6 30 MHz

Large-Signal -3dB Bandwidth BWLS 140 MHz

Slew Rate SR 600 V/µs

Settling Time to 0.1% tS 45 ns

Rise/Fall Time tR, tF 1 ns

-78dBc

Small-Signal -3dB Bandwidth BWSS

200

MHz150

Harmonic Distortion HD-82

-75 dB

Two-Tone, Third-OrderIntermodulation Distortion

IP3 35 dBc

Input 1dB Compression Point 11 dBm

Differential Phase Error DP 0.02 degrees

Differential Gain Error DG 0.02 %

Input Noise-Voltage Density en 10 nV/√Hz

Input Noise-Current Density in 1.3 pA/√Hz

Input Capacitance CIN 1 pF

Disabled Output Capacitance COUT (OFF) 2 pF

Output Impedance ZOUT 6 ΩAmplifier Enable Time tON 100 ns

CONDITIONS

VOUT = 2VP-P

VOUT = 2V step

VOUT = 2V step

f1 = 10.0MHz, f2 = 10.1MHz, VOUT = 1VP-P

VOUT = 100mVP-P

fC = 5MHz, VOUT = 2VP-P

fC = 10MHz, AVCL = 2

NTSC, RL = 150ΩNTSC, RL = 150Ω

VOUT = 20mVP-P

f = 10kHz

f = 10kHz

MAX4018, EN_ = 0

f = 10MHz

MAX4018

MAX4012

MAX4016/MAX4018/MAX4020

VOUT = 20mVP-P (Note 5)

2nd harmonic

3rd harmonic

Total harmonic distortion

Spurious-Free DynamicRange

SFDR -78 dBcfC = 5MHz, VOUT = 2VP-P

Amplifier Disable Time tOFF 1 µsMAX4018

Amplifier Gain Matching 0.1 dBMAX4016/MAX4018/MAX4020,f = 10MHz, VOUT = 20mVP-P

Amplifier Crosstalk XTALK -95 dBMAX4016/MAX4018/MAX4020,f = 10MHz, VOUT = 2VP-P, RS = 50Ω to ground

4

-6100k 1M 10M 100M 1G

MAX4012SMALL-SIGNAL GAIN vs. FREQUENCY

(AVCL = 1)

-4

MAX

4012

-01

FREQUENCY (Hz)

GAIN

(dB)

-2

0

2

3

-5

-3

-1

1

AVCL = 1VOUT = 20mVP-P

3

-7100k 1M 10M 100M 1G

MAX4016/MAX4018/MAX4020SMALL-SIGNAL GAIN vs. FREQUENCY

(AVCL = 1)

-5

MAX

4012

-02

FREQUENCY (Hz)

GAIN

(dB)

-3

-1

1

2

-6

-4

-2

0


9

-1100k 1M 10M 100M 1G

MAX4012SMALL-SIGNAL GAIN vs. FREQUENCY

(AVCL = 2)

1

MAX

4012

-03

FREQUENCY (Hz)

GAIN

(dB)

3

5

7

8

0

2

4

6


9

-1100k 1M 10M 100M 1G

MAX4016/MAX4018/MAX4020SMALL-SIGNAL GAIN vs. FREQUENCY

(AVCL = 2)

1

MAX

4012

-04

FREQUENCY (Hz)

GAIN

(dB)

3

5

7

8

0

2

4

6


0.5

-0.50.1M 1M 10M 100M 1G

MAX4016/MAX4018/MAX4020GAIN FLATNESS vs. FREQUENCY

-0.3

MAX

4012

-07

FREQUENCY (Hz)

GAIN

(dB)

-0.1

0.1

0.3

0.4

-0.4

-0.2

0

0.2


4

-6100k 1M 10M 100M 1G

LARGE-SIGNAL GAIN vs. FREQUENCY

-4

MAX

4012

-05

FREQUENCY (Hz)

GAIN

(dB)

-2

0

2

3

-5

-3

-1

1

VOUT = 2VP-PVOUT BIAS = 1.75V

0.7

-0.30.1M 1M 10M 100M 1G

MAX4012GAIN FLATNESS vs. FREQUENCY

-0.1

MAX

4012

-06

FREQUENCY (Hz)

GAIN

(dB)

0.1

0.3

0.5

0.6

-0.2

0

0.2

0.4


50

-150100k 1M 10M 100M 1G

MAX4016/MAX4018/MAX4020CROSSTALK vs. FREQUENCY

-110

MAX

4212

-08

FREQUENCY (Hz)

CROS

STAL

K (d

B)

-70

-30

10

30

-130

-90

-50

-10

RS = 50Ω1000

0.10.1M 1M 10M 100M

CLOSED-LOOP OUTPUT IMPEDANCEvs. FREQUENCY

MAX

4012

-09

FREQUENCY (Hz)

IMPE

DANC

E (Ω

)

100

1

10

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


_______________________________________________________________________________________ 5

Typical Operating Characteristics(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


6 _______________________________________________________________________________________

0

-100100k 1M 10M 100M

HARMONIC DISTORTION vs. FREQUENCY (AVCL = 1)

-80

MAX

4012

-10

FREQUENCY (Hz)

HARM

ONIC

DIS

TORT

ION

(dBc

)

-60

-40

-20

-10

-90

-70

-50

-30

VOUT = 2VP-PAVCL = 1

2ND HARMONIC

3RD HARMONIC

0

-100100k 1M 10M 100M


-80

MAX

4012

-11

FREQUENCY (Hz)

HARM

ONIC

DIS

TORT

ION

(dBc

)

-60

-40

-20

-10

-90

-70

-50

-30


2ND HARMONIC

3RD HARMONIC

0

-100100k 1M 10M 100M


-80

MAX

4012

-12

FREQUENCY (Hz)

HARM

ONIC

DIS

TORT

ION

(dBc

)

-60

-40

-20

-10

-90

-70

-50

-30


2ND HARMONIC

3RDHARMONIC

0

-10

-20

-30

-60

-70

-90

-80

-40

-50

-100

MAX

4012

-13

LOAD (Ω)0 200 400 600 800 1000

HARMONIC DISTORTION vs. LOAD

HARM

ONIC

DIS

TORT

ION

(dBc

)

f = 5MHzVOUT = 2VP-P

3rd HARMONIC

2rd HARMONIC

0

-100100k 1M 10M 100M

COMMON-MODE REJECTIONvs. FREQUENCY

-80

MAX

4012

-16

FREQUENCY (Hz)

CMR

(dB)

-60

-40

-20

-10

-90

-70

-50

-30

0

-10

-20

-30

-60

-70

-90

-80

-40

-50

-100

MAX

4012

-14

OUTPUT SWING (Vp-p)0.5 1.0 1.5 2.0

HARMONIC DISTORTION vs. OUTPUT SWING

HARM

ONIC

DIS

TORT

ION

(dBc

)

fO = 5MHz

3RD HARMONIC

2ND HARMONIC

-0.010 100

0 100

DIFFERENTIAL GAIN AND PHASE

-0.01

0.00

0.00

0.01

0.01

0.02

0.02

0.03

0.03

IRE

IRE

DIFF

. PHA

SE (d

eg)

DIFF

. GAI

N (%

)

MAX

4012

-15

VCM = 1.35V

VCM = 1.35V

20

-80100k 1M 10M 100M

POWER-SUPPLY REJECTIONvs. FREQUENCY

-60

MAX

4012

-17

FREQUENCY (Hz)

POW

ER-S

UPPL

Y RE

JECT

ION

(dB)

-40

-20

0

10

-70

-50

-30

-10

4.5

4.0

3.5

2.5

2.0

1.5

3.0

1.0

MAX

4012

-18

LOAD RESISTANCE (Ω)25 50 75 100 125 150

OUTPUT SWING vs. LOAD RESISTANCE

OUTP

UT S

WIN

G (V

p-p)

AVCL = 2

RL to VCC/2

RL to GROUND

Typical Operating Characteristics (continued)(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


_______________________________________________________________________________________ 7

IN(50mV/

div)

OUT(25mV/

div)

VOLT

AGE

SMALL-SIGNAL PULSE RESPONSE(AVCL = 1)

MAX4012-19

20ns/divVCM = 2.5V, RL = 100Ω to GROUND

IN(25mV/

div)

OUT(25mV/

div)

VOLT

AGE

SMALL-SIGNAL PULSE RESPONSE(AVCL = 2)

MAX4012-20


IN(50mV/

div)

OUT(25mV/

div)

VOLT

AGE

SMALL-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = 1)

MAX4012-21


IN(1V/div)

OUT(1V/div)

VOLT

AGE

LARGE-SIGNAL PULSE RESPONSE(AVCL = 1)

MAX4012-22


100

10

11 10 1k 10M1M

VOLTAGE-NOISE DENSITYvs. FREQUENCY

MAX

4012

-25

FREQUENCY (Hz)

VOLT

AGE-

NOIS

E DE

NSIT

Y

100 10k 100k

IN(500mV/

div)

OUT(500mV/

div)

VOLT

AGE

LARGE-SIGNAL PULSE RESPONSE(AVCL = 2)

MAX4012-23


IN(1V/div)

OUT(500mV/

div)

VOLT

AGE

LARGE-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = 2)

MAX4012-24


10

11 10 1k 10M1M

CURRENT-NOISE DENSITYvs. FREQUENCY

MAX

4012

-26

FREQUENCY (Hz)

CURR

ENT-

NOIS

E DE

NSIT

Y

100 10k 100k

EN_

5.0V (ENABLE)

0(DISABLE)

1V

0

OUT

ENABLE RESPONSE TIMEMAX4012-27

1µs/divVIN = 1.0V


MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


8 _______________________________________________________________________________________

70

50

60

40

30

20

MAX

4012

-28

LOAD RESISTANCE (Ω)0 200 400 600 800 1k

OPEN-LOOP GAINvs. LOAD RESISTANCE

OPEN

-LOO

P GA

IN (d

B)

400

350

300

250

150

50

100

200

0

MAX

4012

-29

LOAD RESISTANCE (Ω)1000 200 500400300 600

CLOSED-LOOP BANDWIDTHvs. LOAD RESISTANCE

CLOS

ED-L

OOP

BAND

WID

TH (M

Hz)

10

-90100k 10M 100M1M

OFF-ISOLATION vs. FREQUENCY

-80

MAX

4012

-30

FREQUENCY (Hz)

OFF-

ISOL

ATIO

N (d

B)

-70

-60

-50

-40

-30

-20

-10

0

7

6

4

5

3

MAX

4012

-31

TEMPERATURE (°C)-25-50 0 755025 100

SUPPLY CURRENTvs. TEMPERATURE

SUPP

LY C

URRE

NT (m

A)

10

8

6

4

2

0

MAX

4012

-34

SUPPLY VOLTAGE (V)43 5 6 7 8 9 10 11

SUPPLY CURRENTvs. SUPPLY VOLTAGE

SUPP

LY C

URRE

NT (m

A)

6.0

5.5

4.5

5.0

4.0

MAX

4012

-32

TEMPERATURE (°C)-25-50 0 755025 100

INPUT BIAS CURRENTvs. TEMPERATURE

INPU

T BI

AS C

URRE

NT (µ

A)

0.20

0.16

0.12

0.04

0.08

0

MAX

4012

-33

TEMPERATURE (°C)-25-50 0 755025 100

INPUT OFFSET CURRENTvs. TEMPERATURE

INPU

T OF

FSET

VOL

TAGE

5

4

3

1

2

0

MAX

4012

-35

TEMPERATURE (°C)-25-50 0 755025 100

INPUT OFFSET VOLTAGEvs. TEMPERATURE

INPU

T OF

FSET

VOL

TAGE

(mV)

5.0

4.8

4.6

4.2

4.4

4.0

MAX

4012

-36

TEMPERATURE (°C)-25-50 0 755025 100

OUTPUT VOLTAGE SWINGvs. TEMPERATURE

OUTP

UT V

OLTA

GE S

WIN

G (V

p-p)

RL = 150Ω TO VCC/2


MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


_______________________________________________________________________________________ 9

Pin Description

PIN

MAX4012 MAX4012 MAX4018 MAX4020

SO-8 SOT23

MAX4016SO/µMAX

SO QSOP SO QSOP

NAME FUNCTION

1, 5, 8 — — — 8, 9 — 8, 9 N.C.No Connection. Not internally connected. Tieto ground or leave open.

6 1 — — — — — OUT Amplifier Output

4 2 4 11 13 11 13 VEENegative Power Supply or Ground (in single-supply operation)

3 3 — — — — — IN+ Noninverting Input

2 4 — — — — — IN- Inverting Input7 5 8 4 4 4 4 VCC Positive Power Supply

— — 1 7 7 1 1 OUTA Amplifier A Output— — 2 6 6 2 2 INA- Amplifier A Inverting Input

— — 3 5 5 3 3 INA+ Amplifier A Noninverting Input— — 7 8 10 7 7 OUTB Amplifier B Output

— — 6 9 11 6 6 INB- Amplifier B Inverting Input— — 5 10 12 5 5 INB+ Amplifier B Noninverting Input— — — 14 16 8 10 OUTC Amplifier C Output

— — — 13 15 9 11 INC- Amplifier C Inverting Input— — — 12 14 10 12 INC+ Amplifier C Noninverting Input

— — — — — 14 16 OUTD Amplifier D Output— — — — — 13 15 IND- Amplifier D Inverting Input

— — — — — 12 14 IND+ Amplifier D Noninverting Input— — — — — — — EN Enable Amplifier

— — — 1 1 — — ENA Enable Amplifier A— — — 3 3 — — ENB Enable Amplifier B

— — — 2 2 — — ENC Enable Amplifier C

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20 Detailed Description

The MAX4012/MAX4016/MAX4018/MAX4020 are sin-gle-supply, rail-to-rail, voltage-feedback amplifiers thatemploy current-feedback techniques to achieve600V/µs slew rates and 200MHz bandwidths. Excellentharmonic distortion and differential gain/phase perfor-mance make these amplifiers an ideal choice for a widevariety of video and RF signal-processing applications.

The output voltage swing comes to within 50mV of eachsupply rail. Local feedback around the output stageassures low open-loop output impedance to reducegain sensitivity to load variations. This feedback alsoproduces demand-driven current bias to the outputtransistors for ±120mA drive capability, while constrain-ing total supply current to less than 7mA. The inputstage permits common-mode voltages beyond the nega-tive supply and to within 2.25V of the positive supply rail.

Applications InformationChoosing Resistor Values

Unity-Gain ConfigurationThe MAX4012/MAX4016/MAX4018/MAX4020 are inter-nally compensated for unity gain. When configured forunity gain, the devices require a 24Ω resistor (RF) inseries with the feedback path. This resistor improvesAC response by reducing the Q of the parallel LC cir-

cuit formed by the parasitic feedback capacitance andinductance.

Inverting and Noninverting ConfigurationsSelect the gain-setting feedback (RF) and input (RG)resistor values to fit your application. Large resistor val-ues increase voltage noise and interact with the amplifi-er’s input and PC board capacitance. This cangenerate undesirable poles and zeros and decreasebandwidth or cause oscillations. For example, a nonin-verting gain-of-two configuration (RF = RG) using 1kΩresistors, combined with 1pF of amplifier input capaci-tance and 1pF of PC board capacitance, causes a poleat 159MHz. Since this pole is within the amplifier band-width, it jeopardizes stability. Reducing the 1kΩ resis-tors to 100Ω extends the pole frequency to 1.59GHz,but could limit output swing by adding 200Ω in parallelwith the amplifier’s load resistor. Table 1 shows sug-gested feedback, gain resistors, and bandwidth forseveral gain values in the configurations shown inFigures 1a and 1b.

Layout and Power-Supply BypassingThese amplifiers operate from a single 3.3V to 11V powersupply or from dual supplies to ±5.5V. For single-supplyoperation, bypass VCC to ground with a 0.1µF capacitoras close to the pin as possible. If operating with dual sup-plies, bypass each supply with a 0.1µF capacitor.


10 ______________________________________________________________________________________

IN

RG

VOUT = [1+ (RF / RG)] VIN

RF

RTO

RTIN

RO

VOUTMAX40_ _

INRG

VOUT = -(RF / RG) VIN

RF

RTO

RS

RTIN

RO

VOUTMAX40_ _

Figure 1a. Noninverting Gain Configuration Figure 1b. Inverting Gain Configuration

Maxim recommends using microstrip and stripline tech-niques to obtain full bandwidth. To ensure that the PCboard does not degrade the amplifier’s performance,design it for a frequency greater than 1GHz. Pay care-ful attention to inputs and outputs to avoid large para-sitic capacitance. Whether or not you use a constant-impedance board, observe the following guidelineswhen designing the board:

• Don’t use wire-wrap boards because they are tooinductive.

• Don’t use IC sockets because they increase parasiticcapacitance and inductance.

• Use surface-mount instead of through-hole compo-nents for better high-frequency performance.

• Use a PC board with at least two layers; it should beas free from voids as possible.

• Keep signal lines as short and as straight as possi-ble. Do not make 90° turns; round all corners.

Rail-to-Rail Outputs, Ground-Sensing Input

The input common-mode range extends from (VEE - 200mV) to (VCC - 2.25V) with excellent common-mode rejection. Beyond this range, the amplifier outputis a nonlinear function of the input, but does not under-go phase reversal or latchup.

The output swings to within 60mV of either power-supply rail with a 2kΩ load. The input ground-sensingand the rail-to-rail output substantially increase thedynamic range. With a symmetric input in a single 5Vapplication, the input can swing 2.95VP-P, and the out-put can swing 4.9VP-P with minimal distortion.

Enable Input and Disabled OutputThe enable feature (EN_) allows the amplifier to beplaced in a low-power, high-output-impedance state.Typically, the EN_ logic low input current (IIL) is small.However, as the EN voltage (VIL) approaches the nega-tive supply rail, IIL increases (Figure 2). A single resis-tor connected as shown in Figure 3 prevents the rise inthe logic-low input current. This resistor provides afeedback mechanism that increases VIL as the logicinput is brought to VEE. Figure 4 shows the resultinginput current (IIL).

When the MAX4018 is disabled, the amplifier’s outputimpedance is 35kΩ. This high resistance and the low2pF output capacitance make this part ideal inRF/video multiplexer or switch applications. For largerarrays, pay careful attention to capacitive loading. Seethe Output Capacitive Loading and Stability section formore information.

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


______________________________________________________________________________________ 11

RF (Ω) 24 500

RG (Ω) ∞ 500

COMPONENT

RS (Ω) — 0

RTIN (Ω) 49.9 56

Small-Signal -3dB Bandwidth (MHz) 200 90

RTO (Ω) 49.9 49.9

Table 1. Recommended Component Values

Note: RL = RO + RTO; RTIN and RTO are calculated for 50Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the following equation:

500

500

—

49.9

105

49.9

500

250

0

62

60

49.9

500

124

—

49.9

25

49.9

500

100

0

100

33

49.9

500

56

—

49.9

11

49.9

500

50

0

∞

25

49.9

500

20

—

49.9

6

49.9

GAIN (V/V)

1200

50

0

∞

10

49.9

+1 -1 +2 -2 +5 -5 +10 -10 +25 -25

R = 75

1-75R

TIN

G

Ω

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20

To implement the mux function, the outputs of multipleamplifiers can be tied together, and only the amplifierwith the selected input will be enabled. All of the otheramplifiers will be placed in the low-power shutdownmode, with their high output impedance presentingvery little load to the active amplifier output. For gainsof +2 or greater, the feedback network impedance ofall the amplifiers used in a mux application must beconsidered when calculating the total load on theactive amplifier output

Output Capacitive Loading and StabilityThe MAX4012/MAX4016/MAX4018/MAX4020 are opti-mized for AC performance. They are not designed todrive highly reactive loads, which decreases phasemargin and may produce excessive ringing and oscilla-tion. Figure 5 shows a circuit that eliminates this prob-lem. Figure 6 is a graph of the optimal isolation resistor(RS) vs. capacitive load. Figure 7 shows how a capaci-tive load causes excessive peaking of the amplifier’sfrequency response if the capacitor is not isolated fromthe amplifier by a resistor. A small isolation resistor(usually 20Ω to 30Ω) placed before the reactive loadprevents ringing and oscillation. At higher capacitiveloads, AC performance is controlled by the interactionof the load capacitance and the isolation resistor.Figure 8 shows the effect of a 27Ω isolation resistor onclosed-loop response.

Coaxial cable and other transmission lines are easilydriven when properly terminated at both ends with theircharacteristic impedance. Driving back-terminatedtransmission lines essentially eliminates the line’scapacitance.


12 ______________________________________________________________________________________

OUT

IN-EN_

IN+

10kΩ

ENABLE

MAX40_ _

20

-1600 50 100 150 300 350 500

-100

-120

0

mV ABOVE VEE

INPU

T CU

RREN

T (µ

A)

200 250 400 450

-60

-140

-20

-40

-80

0

-100 50 100 150 300 350 500

-7

-8

-1

mV ABOVE VEE

INPU

T CU

RREN

T (µ

A)

200 250 400 450

-3

-5

-9

-2

-4

-6

Figure 2. Enable Logic-Low Input Current vs. VIL

Figure 4. Enable Logic-Low Input Current vs. VIL with 10kΩSeries Resistor

Figure 3. Circuit to Reduce Enable Logic-Low Input Current

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


______________________________________________________________________________________ 13

RG RF

RISO

50Ω

CL

VOUT

VIN

RTIN

MAX40_ _

Figure 5. Driving a Capacitive Load through an Isolation Resistor

30

25

20

5

10

15

0

CAPACITIVE LOAD (pF)500 100 200150 250

ISOL

ATIO

N RE

SIST

ANCE

, RIS

O (Ω

)

Figure 6. Capacitive Load vs. Isolation Resistance

6

-4100k 10M 100M1M 1G

-2

FREQUENCY (Hz)

GAIN

(dB)

0

2

4

5

-3

-1

1

3

CL = 10pF

CL = 15pF

CL = 5pF

Figure 7. Small-Signal Gain vs. Frequency with LoadCapacitance and No Isolation Resistor

3

-7100k 10M 100M1M 1G

-5

FREQUENCY (Hz)

GAIN

(dB)

-3

-1

1

2

-6

-4

-2

0CL = 68pF

RISO = 27Ω

CL = 120pF

CL = 47pF

Figure 8. Small-Signal Gain vs. Frequency with LoadCapacitance and 27Ω Isolation Resistor

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


14 ______________________________________________________________________________________

TOP VIEW

14

13

12

11

10

9

8

1

2

3

4

5

6

7

OUTC

INC-

INC+

VEEVCC

ENB

ENC

ENA

MAX4018

INB+

INB-

OUTBOUTA

INA-

INA+

SO

14

13

12

11

10

9

8

1

2

3

4

5

6

7

OUTD

IND-

IND+

VEEVCC

INA+

INA-

OUTA

MAX4020

INC+

INC-

OUTCOUTB

INB-

INB+

SO

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

OUTC

INC-

INC+

VEE

INB+

INB-

OUTB

N.C.

ENA

ENC

ENB

VCC

INA+

INA-

OUTA

N.C.

MAX4018

QSOP

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

OUTD

IND-

IND+

VEE

INC+

INC-

OUTC

N.C.

OUTA

INA-

INA+

VCC

INB+

INB-

OUTB

N.C.

MAX4020

QSOP

INB-

INB+VEE

1

2

8

7

VCC

OUTBINA-

INA+

OUTA

SO/µMAX

3

4

6

5

MAX4016

Pin Configurations (continued)

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


______________________________________________________________________________________ 15

___________________Chip InformationOrdering Information (continued)

PARTTEMP

RANGETOP

MARKPIN-PACKAGE

14 SO

16 QSOP

14 SO

16 QSOP

MAX4018ESD -40°C to +85°C

MAX4018EEE -40°C to +85°C

MAX4020ESD -40°C to +85°C

MAX4020EEE -40°C to +85°C

—

—

—

—

MAX4012 TRANSISTOR COUNT: 95MAX4016 TRANSISTOR COUNT: 190MAX4018 TRANSISTOR COUNT: 299MAX4020 TRANSISTOR COUNT: 362

SO

T-23

5L

.EP

S

E1

121-0057

PACKAGE OUTLINE, SOT-23, 5L

Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to www.maxim-ic.com/packages.)

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


16 ______________________________________________________________________________________

8LU

MA

XD

.EP

S

PACKAGE OUTLINE, 8L uMAX/uSOP

11

21-0036 JREV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

MAX0.043

0.006

0.014

0.120

0.120

0.198

0.026

0.007

0.037

0.0207 BSC

0.0256 BSC

A2 A1

ce

b

A

L

FRONT VIEW SIDE VIEW

E H

0.6±0.1

0.6±0.1

ÿ 0.50±0.1

1

TOP VIEW

D

8

A2 0.030

BOTTOM VIEW

16∞

S

b

L

HE

De

c

0∞

0.010

0.116

0.116

0.188

0.016

0.005

84X S

INCHES

-

A1

A

MIN

0.002

0.950.75

0.5250 BSC

0.25 0.36

2.95 3.05

2.95 3.05

4.78

0.41

0.65 BSC

5.03

0.66

6∞0∞

0.13 0.18

MAXMIN

MILLIMETERS

- 1.10

0.05 0.15

α

α

DIM

QS

OP

.EP

S

E1

121-0055

PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH

Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to www.maxim-ic.com/packages.)

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

17 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

MA

X4

01

2/M

AX

40

16

/MA

X4

01

8/M

AX

40

20


SO

ICN

.EP

S

PACKAGE OUTLINE, .150" SOIC

11

21-0041 BREV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

TOP VIEW

FRONT VIEW

MAX

0.010

0.069

0.019

0.157

0.010

INCHES

0.150

0.007

E

C

DIM

0.014

0.004

B

A1

MIN

0.053A

0.19

3.80 4.00

0.25

MILLIMETERS

0.10

0.35

1.35

MIN

0.49

0.25

MAX

1.75

0.0500.016L 0.40 1.27

0.3940.386D

D

MINDIM

D

INCHES

MAX

9.80 10.00

MILLIMETERS

MIN MAX

16 AC

0.337 0.344 AB8.758.55 14

0.189 0.197 AA5.004.80 8

N MS012

N

SIDE VIEW

H 0.2440.228 5.80 6.20

e 0.050 BSC 1.27 BSC

C

HE

e B A1

A

D

0∞-8∞L

1

VARIATIONS:

Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to www.maxim-ic.com/packages.)

Documents

Low-Cost, High-Speed, Single-Supply Op Amps with Rail-to ... · General Description The MAX4012 single, MAX4016 dual, MAX4018 triple, and MAX4020 quad op amps are unity-gain-stable