ADC 2 Especificações descarregar pdf

S/H

Comparator

CDAC

Input

MUX

REF

SAR

S/H

Comparator

CDAC

REF

OUT

AGND

SAR

10-BitDAC

2.5VReference

ParallelInterface

CHA0+

CHA0-

CHA1+

CHA1-

DB[11:0]

CLOCK

BUSY

CONVST

BGND

CHB0+

CHB0-

CHB1+

CHB1-

Input

MUX

ADS7865

www.ti.com

SBAS441C –OCTOBER 2008–REVISED APRIL 2012

Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling

Analog-to-Digital Converter

Check for Samples: ADS7865

FEATURES

DESCRIPTION

The ADS7865 is a dual, 12-bit, 2MSPS analog-to-

• Six Pseudo- or Four Fully Differential Inputs

digital converter (ADC) with four fully differential or six

• SNR: 71.7dB, THD: –87dB

pseudo-differential input channels grouped into two

• Programmable Channel Sequencer

pairs for high-speed, simultaneous signal acquisition.

Inputs to the sample-and-hold (S/H) amplifiers are

• Programmable and Buffered Internal 2.5V

fully differential and are maintained differentially to

Reference

the input of the ADC. This architecture provides

• Flexible Power-Down Features

excellent common-mode rejection of 72dB at 100kHz,

• Variable Power-Supply Ranges: 2.7V to 5.5V

which is a critical performance characteristic in noisy

environments.

• Low-Power Operation: 44mW Maximum at 5V

• Operating Temperature Range:

The ADS7865 is pin-compatible with the ADS7862,

but offers additional features such as a

–40°C to +125°C

programmable channel sequencer and reference

• Pin-Compatible Upgrade for the ADS7862

output, flexible supply voltage (2.7V to 5.5V for AV

and BV

), a pseudo-differential input multiplexer with

APPLICATIONS

three channels per ADC, and several power-down

features.

• Motor Control

• Multi-Axis Positioning Systems

The ADS7865 is offered in a TQFP-32 package. It is

specified over the extended operating temperature

• Three-Phase Power Control

range of –40°C to +125°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

1 2 3 4 5 6 ... 32 33

Resumo do Conteúdo

Página 1 - Analog-to-Digital Converter

S/HComparatorCDACInputMUXAVDDREFINSARS/HComparatorCDACREFOUTAGNDSAR10-BitDAC2.5VReferenceParallelInterfaceCHA0+CHA0-CHA1+CHA1-BVDDDB[11:0]CSCLOCKWR

Página 2 - ABSOLUTE MAXIMUM RATINGS

-40 -25 -10 1251109580655035205Temperature( C)°OffsetErrorandOffsetMatch(LSB)2.01.51.00.500.51.01.52.0----OffsetErrorOffsetMatchAV (V)DD1.00.8

Página 3 - ELECTRICAL CHARACTERISTICS

Frequency(Hz)0-20-40-140Amplitude(dB)0 200k 1M-60-80-120400k 600k 800k-100Frequency(kHz)0-20-40-140Amplitude(dB)0 100 750-60-80-120200 300 400-100

Página 4 - error V

-40 -25 -10 1251109580655035205Temperature( C)°THD(dB)-------88907880828486AV =5VDDAV =2.7VDDf (kHz)IN-76-78-92THD(dB)-84AV =2.7VDD-86AV =5VDD-

Página 5 - EQUIVALENT INPUT CIRCUIT

-40 -25 -10 1251109580655035205Temperature( C)°AV (mA)DD1.81.61.41.21.00.80.60.40.20AV =5VDDAV =2.7VDDDataRate(kSPS)60AV (mA)DD0 500 1000 15004Re

Página 6 - DEVICE INFORMATION

InputMUXADC+ADC-CHx1+CHx1-CHx0+CHx0-ADS7865SBAS441C –OCTOBER 2008–REVISED APRIL 2012www.ti.comAPPLICATION INFORMATIONGENERAL DESCRIPTIONThe ADS7865 in

Página 7 - TIMING CHARACTERISTICS

f =-3dBln(2) (n+1)´2 tp ´ACQADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012Analog-to-Digital Converter (ADC)The minimum –3dB bandwidth of

Página 8 - TIMING REQUIREMENTS

ADS7865SBAS441C –OCTOBER 2008–REVISED APRIL 2012www.ti.comRESETreference stable (see the previous discussion ofREFIN). For applications that use an ex

Página 9 - TYPICAL CHARACTERISTICS

ADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012DIGITAL DP: Deep power-down enable('1' = device in deep power-down mode)This secti

Página 10 - = 32MHz, and f

CLOCKCONVSTWRRDCSDB[11:0]B SU YPrevious Con rsve ionofBothCHxxConversionofBothDifferentialCHx0ConversionofBothDifferentialCHx1OutputC AH xOutp

Página 11

ADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012Sequencer RegisterA/B data of the second-last channel in the sequence,and so on. Trying to r

Página 12

ADS7865SBAS441C –OCTOBER 2008–REVISED APRIL 2012www.ti.comThis integrated circuit can be damaged by ESD. Texas Instruments recommends that all integra

Página 13

ConvA ConvB ConvCConvA ConvB ConvCConvA ConvB ConvCCONVSTBUSYMode0(One-shotconversionstart,oneBUSYforwholesequence)CONVSTBUSYMode1

Página 14 - GENERAL DESCRIPTION

WRRDCSDB[11:0]b01xxxxx001DAC lVa ueb01xxxxx011 DAC lVa ueADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012Programming the Reference DACTo ver

Página 15 - and also

ADS7865SBAS441C –OCTOBER 2008–REVISED APRIL 2012www.ti.comPower-Down Modes and ResetThe auto-nap power-down mode is very similar tothe nap mode. The o

Página 16

f =-3dBln(2) 2´2 16 tp ´ ´CLKADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012ADS7862 COMPATIBILITY DAC properly via the DAC register while r

Página 17

f =FILTERln(2) (n+1)´2 2 Rp ´ C´ ´ ´R=tACQln(2) 2(n+1) C´ ´ ´BGNDCHB1+CHB1-CHB0+CHB0-CHA1+CHA1-CHA0+CHA0-REFINREFOUTAGNDBGNDBVDDDB[11:0]BUSYCLOCK

Página 18 - 1 00 h D 00 h

ADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012LAYOUT Depending on the circuit density of the board,placement of the analog and digital com

Página 19

LEGENDTOPlayer;copperpourandtraceslowerlayer;AGNDarealowerlayer;BGNDareaviaTop ViewADS7865IREFINREFOUTAGND22BGNDBVDD212032 31 30 29 28 27to

Página 20 - BothCH0+

ADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012REVISION HISTORYNOTE: Page numbers for previous revisions may differ from page numbers in th

Página 21 - 11 10 9 8 7 6 5 4 3 2 1 0

PACKAGE OPTION ADDENDUMwww.ti.com10-Jun-2014Addendum-Page 1PACKAGING INFORMATIONOrderable Device Status(1)Package Type PackageDrawingPins PackageQtyEc

Página 22

PACKAGE OPTION ADDENDUMwww.ti.com10-Jun-2014Addendum-Page 2continues to take reasonable steps to provide representative and accurate information but m

Página 23 - 2 16 tp ´ ´

ADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012ELECTRICAL CHARACTERISTICSAt TA= –40°C to +125°C; over entire power-supply voltage range, VR

Página 24

TAPE AND REEL INFORMATION*All dimensions are nominalDevice PackageTypePackageDrawingPins SPQ ReelDiameter(mm)ReelWidthW1 (mm)A0(mm)B0(mm)K0(mm)P1(mm)W

Página 25

*All dimensions are nominalDevice Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)ADS7865IPBSR TQFP PBS 32 1000 367.0 367.0 38

Página 26 - Top View

Página 27 - REVISION HISTORY

IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and otherch

Página 28 - PACKAGE OPTION ADDENDUM

ADS7865SBAS441C –OCTOBER 2008–REVISED APRIL 2012www.ti.comELECTRICAL CHARACTERISTICS (continued)At TA= –40°C to +125°C; over entire power-supply volta

Página 29

R =200WSERR =50WSWCHXX+R =200WSERR =50WSWCHXX-C =5pFPARC =5pFPARC =2pFSC =2pFSADS7865www.ti.comSBAS441C –OCTOBER 2008–REVISED APRIL 2012ELECTR

Página 30 - PACKAGE MATERIALS INFORMATION

REFINREFOUTAGNDAVDDDB11DB10DB9DB8BVDDBGNDWRRDCSCLOCKCONVSTBUSY123456782423222120191817CHA0+32DB79CHA0-31DB610CHA1+30DB511CHA1-29DB412CHB0-28DB313CHB0+

Página 31

CLOCKCONVSTWRRDCSDB[11:0]BUSY1 1614tCLKtCLKHtCLKLt1t2t5t6t10t11CHAxOutputt13InputDatat6t7CHBxOutputPreviousConversion Resultst14Conversion CycletCONV

Página 32

CLOCKCONVST10nsCyc el 1Cyc el 2AB C10ns5ns 5nsADS7865SBAS441C –OCTOBER 2008–REVISED APRIL 2012www.ti.comTIMING REQUIREMENTS(1)ADS7865PARAMETER TEST CO

Página 33 - IMPORTANT NOTICE

-40 -25 -10 1251109580655035205Temperature( C)°INL(LSB)PositiveNegative1.000.750.500.2500.250.500.751.00----DataRate(MSPS)1.000.750.500.2500.250.5