2

3

10

14

18

COMPARATOR A

SW1

VDD

OUT-

SW2

VDD

CON

OUT+

LE

RE

RON

COMPARATOR B

“

”

©

http://www.maxim-ic.com.cn/NewsBrief

“ ”

3

RL

GATE-DRIVEAMPLIFIER

TRIANGLE-WAVEOSCILLATOR

GND

COUT

t

VO(t)

VDD VDD

VO_AVGCF

VL

LF

VAUDIO+

-

++

-

-

4

|A| A OFFON =

0(0)I)(TI(t)dtVL

1LSWL

T

0

L

SW

=-=∫

∫= (t)dtVL1

(t)I LL

TSW

VDDVO

GND

NOTE: FOR CLARITY, SIGNAL PERIODS ARE NOT SHOWN TO SCALE.

INPUTSIGNAL

TRIANGLE-WAVEOSCILLATOR SIGNAL

5

Σ ΔVDD

AOFFAOFF

AON

AON = - (VDD - VO) x tONAOFF = - VO x tOFFS

AL (t)

VDD - VO

VO (t)

- VO

IL (t)

tON

AON

tOFF

IAVG

TSW

t

t

t

VIN (s)

En (s)

En (s) = NOISE DUE TO PWM NONLINEARITIES, OUTPUT-STAGE NONLINEARITIES, AND SUPPLY DEVIATIONS

+

+

+

-

1

s

FEEDBACKNETWORK

PWMSIGNAL-TRANSFER

FUNCTIONNOISE-TRANSFER

FUNCTION

OUTPUT LPFRESPONSE

SHAPED NOISE

f

POW

ER S

PECT

RAL

DENS

ITY

= 1

(s)Es1

s(s)V

s11

(s)V nINO ++×

+=

—

Ω

Ω

—

6

7

OFF

OUT-

ON

RSPKR LFLF

IL

VDD

OUT+

ON

OFFPWMOUTPUTCF CF

ON

OUT-

OFF

RSPKR LFLF

IL

VDD

OUT+

OFF

ONPWMOUTPUT CF CF

OUT+

OUT-

DIFFERENTIAL OUTPUT(OUT+ - OUT-)

VDD

VDD

VDD

-VDD

GND

GND

2 x VDD

8

COMPARATOR A

SW1

VDD

OUT-

SW2

VDD

CON

OUT+

LE

RE

RON

COMPARATOR B

VIN-

VIN+

-VDD

VDD

VDD

VDD

VOUT+ - VOUT-

TSW

OUT-

OUT+ t ON(

MIN

)

0V

GND

GND

9

*

±

*

20

-801M 10M 100M 1G

-60

FREQUENCY (Hz)

OUTP

UT M

AGNI

TUDE

(dBV

)

-40

-20

0

-10

-30

-50

-70

10RBW = 10kHzMEASURED BETWEEN OUT+ OROUT- AND GROUND

20

-801M 10M 100M 1G

-60

FREQUENCY (Hz)

OUTP

UT M

AGNI

TUDE

(dBV

)

-40

-20

0

-10

-30

-50

-70

10RBW = 10kHzMEASURED BETWEEN OUT+ OROUT- AND GROUND

10

—

“ ”

—

® ®

11

—

®

•

•

•

•

DS3600

SPI™ BUS

HIGH

-SPE

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LEAR

DEVICEREGISTERS

64-BYTEENCRYPTION-

KEY SRAM

TEMP SENSOR

RTC OSCILLATOR

TAMPERCOMPARATORS

POR AND BATTERYCONTROL

SYSTEMPROCESSOR

EXTERNALSRAM

RESI

STIV

E M

ESH

TAM

PER

SENS

OR

SYST

EM V

OLTA

GE

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

—

•

•

•

•

•

“ ”

•

•

•

•

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12

13

14

μ

μ

W

CS

•

• μ

• “ ” “ ”

•

μ

•

• μ μ

•

•

®

( )

1-Wire,LIN bus,

SensorPath

RS-485, LVDS,CAN, USB 2.0,

FireWire®

I2C, SMBus™SPI™,

MICROWIRE™

15

“ ”

μ μ μ

μ μ

“ ”

CS

16

17

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“ ”

“

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“ ”

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“ ”

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”

http://www.interbusclub.com/http://www.m-bus.com/http://www.maxim-ic.com.cn/AN1796http://www.lin-subbus.org/http://www.national.com/nationaledge/jan04/article.htmlhttp://www.maxim-ic.com.cn/AN244http://www.maxim-ic.com.cn/AN244http://www.maxim-ic.com.cn/AN148http://www.maxim-ic.com.cn/AN155http://www.maxim-ic.com.cn/AN155http://www.maxim-ic.com.cn/AN3829http://www.maxim-ic.com.cn/AN178http://www.maxim-ic.com.cn/AN186http://www.maxim-ic.com.cn/AN3675http://www.maxim-ic.com.cn/AN3826http://www.maxim-ic.com.cn/AN3826http://www.nxp.com/acrobat_download/literature/9398/39340011.pdfhttp://www.nxp.com/acrobat_download/literature/9398/39340011.pdfhttp://www.smbus.org/specs/http://www.freescale.com/files/microcontrollers/doc/data_sheet/M68HC11E.pdfhttp://www.freescale.com/files/microcontrollers/doc/data_sheet/M68HC11E.pdfhttp://www.national.com/an/AN/AN-452.pdfhttp://www.ausairpower.net/OSR-0201.htmlhttp://www.usb.org/developers/docshttp://www.national.com/appinfo/lvds/files/ownersmanual.pdfhttp://www.lammertbies.nl/comm/info/RS-485.htmlhttp://www.semiconductors.bosch.de/pdf/can2spec.pdfhttp://www.can-cia.org/downloads/ciaspecifications/?269pdfserv.maxim-ic.com/cn/ej/DallasEJ2.pdfpdfserv.maxim-ic.com/cn/ej/DallasEJ2.pdf

18

“ ”

“ ”

1-WireDEVICE

VCC

R

PIO

1-Wire HOST(µC)

1-WireDEVICE

GNDTXD

RXD

PARASITEPOWERSUPPLY

INTERFACECONTROL

64-BIT ID

DEVICEFUNCTION

INTERNAL VDD

1-WIRE

PORTCONTROL

PIO PIN

“ ”

19

WRITE 0 WRITE 1 READ 1

MS: MASTER SAMPLESS: SLAVE SAMPLE

MASTER-INITIATEDREAD/WRITE TIME SLOTS

MS

READ 0

MSSS

SS

http://www.maxim-ic.com.cn/1-Wire