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S/H
Comparator
CDAC
Input
MUX
AV
DD
REF
IN
SAR
S/H
Comparator
CDAC
REF
OUT
AGND
SAR
10-BitDAC
2.5VReference
ParallelInterface
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 2008–REVISED 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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