Low-Power Single/Dual, Rail-to-Rail Op Amps...2 _____ MAX9614/MAX9616 Low-Power Single/Dual, Rail-to-Rail Op Amps Stresses beyond those listed under “Absolute Maximum Ratings”

_______________________________________________________________ Maxim Integrated Products 1

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

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Low-Power Single/Dual, Rail-to-Rail Op Amps

19-5302; Rev 0; 8/10

Typical Application Circuit

General DescriptionThe MAX9614/MAX9616 are low-power precision op amps that feature precision MOS inputs.

These devices are ideal for a large number of signal pro-cessing applications such as photodiode transimped-ance amplifiers and filtering/amplification of a wide variety of signals in industrial equipment. The devices also feature excellent RF immunity, making them ideal for portable applications.

The MAX9614/MAX9616 are capable of operating from a 2.5V to 5.5V supply voltage over the -40NC to +125NC automotive temperature range.

Both singles and duals are available in tiny SC70 pack-ages. The MAX9614 features an active-low shutdown pin.

ApplicationsNotebooks, Portable Media Players

Industrial and Medical Sensors

General Purpose Signal Processing

FeaturesS VCC = 2.5V to 5.5V (-40°C to +125°C)

S Low 100µV (max) VOS

S 1µA Supply Current in Shutdown, 175µA Operating

S Small SC70 Package

S 2.8MHz Bandwidth

S Excellent RF Immunity

+Denotes lead(Pb)-free/RoHS-compliant package.T = Tape and reel.

Ordering Information

PARTTEMP

RANGEPIN-PACKAGE

TOPMARK

MAX9614AXT+T-40NC to +125NC

6 SC70 +ADL

MAX9616AXA+T-40NC to +125NC

8 SC70 +AAE

VCC

VCC/2

20kI

100nF

INPUT

1.21kI

20kIMAX9614

MAX11613

66.5kI 66.5kI

220pF

ADC

121kI

USING THE MAX9614 OUTPUT AMPLIFIER AS AN ANTI-ALIASING FILTER (CORNER FREQUENCY = 1.3kHz) TO MAXIMIZE NYQUIST BANDWIDTH.

4.7nF

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

IN+, IN-, SHDN, VCC to GND..................................-0.3V to +6VOUT to GND ................................................-0.3V to VCC + 0.3VShort-Circuit (GND) Duration, OUT, OUTA, OUTB ................. 5sContinuous Input Current (any pin) .................................Q20mAThermal Limits (Note 1) Multilayer PCBContinuous Power Dissipation (TA = +70NC)

6-Pin SC70 (derate 3.1mW/NC above +70NC) .............245mW BJA .......................................................................326.5NC/W BJC ..........................................................................115NC/W

8-Pin SC70 (derate 3.1mW/NC above +70NC) .............245mW BJA ..........................................................................326NC/W BJC ..........................................................................115NC/W

Operating Temperature Range ........................ -40NC to +125NCJunction Temperature .....................................................+150NCLead Temperature (soldering, 10s) ................................+300NCSoldering Temperature (reflow) ......................................+240NC

ELECTRICAL CHARACTERISTICS(VCC = VSHDN = 3.3V, VIN+ = VIN- = VCM = GND, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless otherwise noted.) (Note 2)

ABSOLUTE MAXIMUM RATINGS

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC CHARACTERISTICS

Input Voltage Range VIN+, VIN- Guaranteed by CMRR test -0.1VCC - 1.4

V

Input Offset Voltage VOS

TA = +25NC 17 100

FVTA = -40NC to +125NC, after power-up autocalibration

165

TA = -40NC to +125NC 750

Input Offset Voltage Drift VOS - TC 1 7.5 FV/NC

Input Bias Current (Note 3) IB

TA = -40NC to +25°C 1 1.55

pATA = +70NC 45

TA = +85NC 135

TA = +125NC 1.55 nA

Input Offset Current (Note 3) IOS

TA = -40NC to +25°C 0.5

pATA = +70NC 7

TA = +85NC 25

TA = +125NC 4000

Common-Mode Rejection Ratio CMRR

VCM = -0.1V to VCC - 1.4V, TA = +25NC 80 95

dBVCM = -0.1V to VCC - 1.4V, TA = -40NC to +125NC

78

Open-Loop Gain AOL+0.4V P VOUT P VCC - 0.4V, RL = 10kI 99 115

dB+0.4V P VOUT P VCC - 0.4V, RL = 600I 93 110

Output Short-Circuit Current (Note 4)

ISCTo VCC 275

mATo GND 75

Output Voltage Low VOL

RL = 10kI 1 11

mVRL = 600I 11 100

RL = 32I 170

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ELECTRICAL CHARACTERISTICS (continued)(VCC = VSHDN = 3.3V, VIN+ = VIN- = VCM = GND, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless otherwise noted.) (Note 2)

Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.Note 3: Guaranteed by design, not production tested.Note 4: Do not exceeed package thermal dissipation in the Absolute Maximum Ratings section.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Voltage High VOH

RL = 10kIVCC -

11VCC -

2

mVRL = 600IVCC - 100

VCC - 30

RL = 32IVCC - 560

AC CHARACTERISTICS

Input Voltage Noise Density en f = 10kHz 28 nV/√HzInput Voltage Noise Total noise 0.1Hz P f P 10Hz 5 FVP-P

Input Current Noise Density In f = 10kHz 0.1 fA/√HzGain Bandwidth GBW 2.8 MHz

Slew Rate SR 1.3 V/Fs

Capacitive Loading CLOAD No sustained oscillation 200 pF

Total Harmonic Distortion THD f = 10kHz, VOUT = 2VP-P, AV = 1V/V -85 dB

POWER-SUPPLY CHARACTERISTICS

Power-Supply Range VCC Guaranteed by PSRR 2.5 5.5 V

Power-Supply Rejection Ratio PSRRTA = +25NC 85 106

dBTA = -40NC to +125NC 83

Quiescent Current ICCTA = +25NC, per amplifier 170 255

FATA = -40NC to +125NC, per amplifier 350

Shutdown Supply Current ISHDN MAX9614 only 1 FA

Shutdown Input Low VIL MAX9614 only 0.5 V

Shutdown Input High VIH MAX9614 only 1.4 V

Output Impedance in Shutdown ROUT_SHDN MAX9614 only 10 MI

Turn-On Time from SHDN tON MAX9614 only 20 Fs

Power-Up Time tUP 10 ms

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Typical Operating Characteristics(VCC = 3.3V, VIN+ = VIN- = 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)

INPUT BIAS CURRENT vs.COMMON-MODE VOLTAGE

MAX

9614

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COMMON-MODE VOLTAGE (V)

INPU

T BI

AS C

URRE

NT (

pA)

3.53.02.0 2.51.0 1.50.5

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1.0

-1.00 4.0

TA = +25°C

INPUT BIAS CURRENTvs. TEMPERATURE

MAX

9614

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TEMPERATURE (°C)

INPU

T BI

AS C

URRE

NT (p

A)

1007550250-25

0.1

1

10

100

0.01-50 125

VCM = 0V

POWER-UP TRANSIENTMMAX9614-16 toc09

VOUT200mV/div

VCC2V/div

GND

GND

4ms/div

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX

9614

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SUPPLY VOLTAGE (V)

SUPP

LY C

URRE

NT (µ

A)

5.55.04.54.03.53.0

50

100

150

200

250

300

02.5 6.0

TA = +125°C

TA = +25°C TA = +85°C

TA = -40°C

SUPPLY CURRENT vs. TEMPERATUREM

AX96

14 to

c05

TEMPERATURE (°C)

1007550250-25-50 125

SUPP

LY C

URRE

NT (µ

A)

50

100

150

200

250

300

0

RLOAD = NO LOAD

INPUT BIAS CURRENTvs. COMMON-MODE VOLTAGE

MAX

9614

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INPU

T BI

AS C

URRE

NT (

pA)

2.52.01.51.00.5

0.1

1

10

100

1000

10,000

0.010 3.0

TA = +125°C

TA = +85°C

TA = +25°C

TA = -40°C TA = 0°C

OFFSET VOLTAGEvs. COMMON-MODE VOLTAGE

MAX

9614

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OFFS

ET V

OLTA

GE (µ

V)

2.01.51.00.50

-50

0

50

100

150

200TA = +125°C

TA = +25°C

TA = +85°C

TA = -40°C

250

-100-0.5 2.5

OFFSET VOLTAGE vs. SUPPLY VOLTAGE

MAX

9614

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SUPPLY VOLTAGE (V)

OFFS

ET V

OLTA

GE (µ

V)

5.04.54.03.53.02.52.0

10

20

30

40

50

60

01.5 5.5

OFFSET VOLTAGE HISTOGRAM

MAX

9614

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OFFSET VOLTAGE (µV)

OCCU

RANC

E (%

)

504010 20 30

5

10

15

20

25

30

35

40

00 60

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Typical Operating Characteristics (continued)(VCC = 3.3V, VIN+ = VIN- = 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)

COMMON-MODE REJECTION RATIOvs. FREQUENCY

MAX

9614

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FREQUENCY (kHz)

COM

MON

-MOD

E RE

JECT

ION

RATI

O (d

B)

10001001010.1

10

20

30

40

50

60

70

80

90

100

00.01 10,000

POWER-SUPPLY REJECTION RATIOvs. FREQUENCY

MAX

9614

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FREQUENCY (kHz)

POW

ER-S

UPPL

Y RE

JECT

ION

RATI

O (d

B)

10001001010.10.01

20

40

60

80

100

120

00.001 10,000

INPUT VOLTAGE NOISE vs. FREQUENCY

MAX

9614

toc1

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FREQUENCY (Hz)

INPU

T VO

LTAG

E NO

ISE

(nV/√

Hz)

10k1k

10

20

30

40

50

60

70

80

90

100

0100 100k

INPUT CURRENT NOISE vs. FREQUENCY

MAX

9614

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FREQUENCY (Hz)

INPU

T CU

RREN

T NO

ISE

(fA/√

Hz)

10k1k100

0.05

0.10

0.15

0.20

0.25

0.30

010 100k

RECOVERY FROM SHUTDOWNMAX9614-16 toc14

VOUT200mV/div

VCC2V/div

GND

GND

10µs/div

TOTAL HARMONIC DISTORTION

MAX

9614

toc1

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FREQUENCY (Hz)

TOTA

L HA

RMON

IC D

ISTO

RTIO

N (d

B)

10k1k100

-110

-100

-90

-80

-70

-60

-12010 100k

VIN = 2VP-PAV = 1V/V

TOTAL HARMONIC DISTORTIONPLUS NOISE

MAX

9614

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FREQUENCY (Hz)

TOTA

L HA

RMON

IC D

ISTO

RTIO

N PL

US N

OISE

(dB)

10k1k100

-100

-80

-60

-40

-20

0

-12010 100k

VIN = 2VP-PAV = 1V/V

OUTPUT HIGH VOLTAGEvs. OUTPUT SOURCE CURRENT

MAX

9614

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OUTPUT SOURCE CURRENT (mA)

OUTP

UT H

IGH

VOLT

AGE

(V)

252015105

2.5

2.6

2.7

2.8

2.9

3.0

3.1

3.2

3.3

3.4

2.40 30

TA = -40°C

TA = +25°C

TA = +85°C

TA = +125°C

OUTPUT LOW VOLTAGEvs. OUTPUT SINK CURRENT

MAX

9614

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OUTPUT SINK CURRENT (mA)

OUTP

UT L

OW V

OLTA

GE (V

)

252015105

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

00 30

TA = +125°C

TA = +85°C

TA = -40°C

TA = +25°C

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RECOVERY FROM SATURATIONOUTPUT SATURATED TO GND

MAX9614-16 toc25

VOUT500mV/div

VIN50mV/div

GND

GND

10µs/div

AV = 10V/V

0.1Hz TO 10Hz NOISEMAX9614 toc19

VOUT1µV/div

OPEN-LOOP GAIN vs. FREQUENCY

MAX

9614

-16

toc2

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FREQUENCY (kHz)

OPEN

-LOO

P GA

IN (d

B)

10001001010.10.01

20

40

60

80

100

120

00.001 10,000

STABILITY vs. CAPACITIVE ANDRESISTIVE LOAD IN PARALLEL

MAX

9614

toc2

1

CAPACITIVE LOAD (pF)

RESI

STIV

E LO

AD (kI

)

900800700600500400300200100

2

4

6

8

10

12

14

00 1000

UNSTABLE

STABLE

STABILITY vs. CAPACITIVE WITHSERIES ISOLATION RESISTOR

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9614

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CAPACITIVE LOAD (pF)

RESI

STIV

E LO

AD (I

)

1000800200 400 600

10

20

30

40

50

60

70

80

00 1200

UNSTABLE

STABLE

100mV STEP RESPONSECLOAD = 200pF

MAX9614-16 toc23

VOUT50mV/div

VIN50mV/div

GND

GND

1µs/div

2V STEP RESPONSECLOAD = 200pF

MAX9614-16 toc24

VOUT1V/div

VIN1V/div

GND

GND

4µs/div

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Pin Description

Pin Configuration


RECOVERY FROM SATURATIONOUTPUT SATURATED TO VCC

MAX9614-16 toc26

VOUT1V/div

VIN1V/div

GND

GND

10µs/div

AV = 10V/V

NO PHASE REVERSALMAX9614 toc28

VIN1V/div

VOUT1V/div

200µs/div

OUTPUT IMPEDANCE vs. FREQUENCY

MAX

9614

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FREQUENCY (kHz)

RESI

STAN

CE (I

)

10001001010.1

5

10

15

20

25

00 10,000

6 SC70

TOP VIEWNOT TO SCALE

MAX9614

IN-

1

2GND

IN+

3 OUT

6

5

VCC

SHDN

4

+

8 SC70

MAX9616

INA+

INA-

OUTA

INB-

INB+

VCC

OUTB

8

7

6

5

1

2

3

GND 4

+

PINNAME FUNCTION

MAX9614 MAX9616

1 — IN+ Positive Input

— 3 INA+ Positive Input A

— 5 INB+ Positive Input B

2 4 GND Ground

3 — IN- Negative Input

— 2 INA- Negative Input A

— 6 INB- Negative Input B

4 — OUT Output

— 1 OUTA Output A

— 7 OUTB Output B

5 — SHDN Active-Low Shutdown

6 8 VCC Positive Power Supply. Bypass with a 0.1FF capacitor to ground.

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Detailed DescriptionThe MAX9614/MAX9616 are low-power op amps ideal for signal processing applications due to the devices’ high precision and CMOS inputs.

The MAX9614 also features a low-power shutdown mode that greatly reduces quiescent current while the device is not operational.

The MAX9614/MAX9616 self-calibrate on power-up to elim-inate effects of temperature and power-supply variation.

RF ImmunityThe MAX9614/MAX9616 feature robust internal EMI filters that reduce the devices’ susceptibility to high-frequency RF signals such as from wireless and mobile devices. This, combined with excellent DC and AC specifications, makes these devices ideal for a wide variety of portable audio and sensitive signal-conditioning applications.

Applications InformationPower-Up Autotrim

The MAX9614/MAX9616 feature an automatic power-up autotrim that self-calibrates the VOS of these devices to less than 100FV of input offset voltage. The autotrim sequence takes approximately 10ms to complete, and is triggered by an internal power-on reset (POR) circuitry. During this time, the inputs and outputs are put into high impedance and left unconnected. This self-calibration feature allows the device to eliminate input offset voltage effects due to power supply and operating temperature variation simply by cycling its power.

Take care to ensure that the power supply settles within 0.4ms of power-up after it crosses a POR threshold of 0.5V to ensure that a stable power supply is present when it steps through its autotrim sequence. If the power supply glitches below the 0.5V threshold, the POR cir-cuitry reactivates during next power-up.

Shutdown OperationThe MAX9614 features an active-low shutdown mode that puts both inputs and outputs into a high-impedance state. In this mode, the quiescent current is less than 1FA. Putting the output in high-impedance allows mul-tiple signal outputs to be multiplexed onto a single output line without the additional external buffers. The device

does not self-calibrate when exiting shutdown mode, and retains its power-up trim settings. The device also instantly recovers from shutdown.

The shutdown logic levels of the device are independent of supply allowing the shutdown to operate by either a 1.8V or 3.3V microcontroller.

Interfacing with the MAX11613The MAX9616 dual amplifier’s low power and tiny size is ideal for driving multichannel analog-to-digital con-verters (ADCs) such as the MAX11613 (see the Typical Application Circuit). The MAX11613 is a low-power, 12-bit I2C ADC that measures either four single-ended or two differential channels in an 8-pin FMAX® pack-age. Operating from a single 3V or 3.3V supply, the MAX11613 draws a low 380FA supply current when sam-pling at 10ksps.The MAX11613 family also offers pin-compatible 5V ADCs (MAX11612) and 8-bit (MAX11601) and 10-bit (MAX11607) options.

The MAX9614/MAX9616’s output voltage low is designed to be especially close to ground—it is only 11mV above ground, allowing maximum dynamic range in single-supply applications. High output cur-rent and capacitance drive capability of the part help it to be useful in ADC driver and line-driver.

Figure 1. Autotrim Timing Diagram

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

CALIBRATEDAMPLIFIER

ACTIVE

0.4ms

10ms

0V

2V

0V0.5V

VCC

VOUT*

5V

TIME FOR POWER SUPPLYTO SETTLE

AMPLIFIER AUTOTRIM

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Input Bias CurrentThe MAX9614/MAX9616 feature a high-impedance CMOS input stage and a specialized ESD structure that allows low input bias current operation at low input common-mode voltages. Low input bias current is useful when interfacing with high-ohmic sensors. It is also beneficial for designing transimpedance ampli-fiers for photodiode sensors. This makes the MAX9614/MAX9616 ideal for ground referenced medical and industrial sensor applications.

Active FiltersThe MAX9614/MAX9616 are ideal for a wide variety of active filter circuits that make use of their rail-to-rail output stages and high impedance CMOS inputs. The Typical Application Circuit shows an example multiple feedback active filter circuit with a corner frequency of 1.3kHz. At low frequencies, the amplifier behaves like a simple low-distortion inverting amplifier of gain = -1, while its high bandwidth gives excellent stopband attenuation above its corner frequency. See the Typical Application Circuit.

Chip InformationPROCESS: BiCMOS

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Package InformationFor the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.

6 SC70 X6SN-1 21-0077 90-0189

8 SC70 X8SN-1 21-0460 —

SC

70, 6

L.E

PS

http://pdfserv.maxim-ic.com/package_dwgs/21-0077.PDF

http://pdfserv.maxim-ic.com/land_patterns/90-0189.PDF

http://pdfserv.maxim-ic.com/package_dwgs/21-0460.PDF

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Package Information (continued)For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

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

12 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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Revision History

REVISIONNUMBER

REVISIONDATE

DESCRIPTIONPAGES

CHANGED

0 8/10 Initial release —

Documents

Low-Power Single/Dual, Rail-to-Rail Op Amps...2 _____ MAX9614/MAX9616 Low-Power Single/Dual, Rail-to-Rail Op Amps Stresses beyond those listed under “Absolute Maximum Ratings”