ADC 2 Spécifications

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S/H
Comparator
CDAC
Input
MUX
AV
DD
REF
IN
SAR
S/H
Comparator
CDAC
REF
OUT
AGND
SAR
10-BitDAC
2.5VReference
ParallelInterface
CHA0+
CHA0-
CHA1+
CHA1-
BV
DD
DB[11:0]
CS
CLOCK
WR
RD
BUSY
CONVST
BGND
CHB0+
CHB0-
CHB1+
CHB1-
Input
MUX
ADS7865
www.ti.com
SBAS441C OCTOBER 2008REVISED APRIL 2012
Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling
Analog-to-Digital Converter
Check for Samples: ADS7865
1
FEATURES
DESCRIPTION
The ADS7865 is a dual, 12-bit, 2MSPS analog-to-
2
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
DD
and BV
DD
), 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.
1
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.
Copyright © 2008–2012, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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Résumé du contenu

Page 1 - Analog-to-Digital Converter

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

Page 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

Page 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

Page 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-

Page 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

Page 6 - DEVICE INFORMATION

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

Page 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

Page 8 - TIMING REQUIREMENTS

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

Page 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

Page 10 - = 32MHz, and f

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

Page 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

Page 12

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

Page 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

Page 14 - GENERAL DESCRIPTION

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

Page 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

Page 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

Page 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

Page 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

Page 19

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

Page 20 - BothCH0+

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

Page 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

Page 22

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

Page 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

Page 24

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

Page 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

Page 27 - REVISION HISTORY

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

Page 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

Page 29

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

Page 30 - PACKAGE MATERIALS INFORMATION

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

Page 31

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

Page 32

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

Page 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

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