ADS7865_14 Datasheet, PDF (1/33 Pages) Texas Instruments – Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling Analog-to-Digital Converter

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
1
•2 Six Pseudo- or Four Fully Differential Inputs
• SNR: 71.7dB, THD: –87dB
• Programmable Channel Sequencer
• Programmable and Buffered Internal 2.5V
Reference
• Flexible Power-Down Features
• Variable Power-Supply Ranges: 2.7V to 5.5V
• Low-Power Operation: 44mW Maximum at 5V
• Operating Temperature Range:
–40°C to +125°C
• Pin-Compatible Upgrade for the ADS7862
APPLICATIONS
• Motor Control
• Multi-Axis Positioning Systems
• Three-Phase Power Control
DESCRIPTION
The ADS7865 is a dual, 12-bit, 2MSPS analog-to-
digital converter (ADC) with four fully differential or six
pseudo-differential input channels grouped into two
pairs for high-speed, simultaneous signal acquisition.
Inputs to the sample-and-hold (S/H) amplifiers are
fully differential and are maintained differentially to
the input of the ADC. This architecture provides
excellent common-mode rejection of 72dB at 100kHz,
which is a critical performance characteristic in noisy
environments.
The ADS7865 is pin-compatible with the ADS7862,
but offers additional features such as a
programmable channel sequencer and reference
output, flexible supply voltage (2.7V to 5.5V for AV_DD
and BV_DD), a pseudo-differential input multiplexer with
three channels per ADC, and several power-down
features.
The ADS7865 is offered in a TQFP-32 package. It is
specified over the extended operating temperature
range of –40°C to +125°C.
AV_DD
CHA0+
CHA0-
CHA1+
CHA1-
CHB0+
CHB0-
CHB1+
CHB1-
REF_IN
Input
MUX
Input
MUX
REF_OUT
AGND
SAR
S/H
CDAC
Comparator
S/H
CDAC
Comparator
SAR
10-Bit DAC
2.5V Reference
BV_DD
DB[11:0]
CS
CLOCK
WR
RD
BUSY
CONVST
BGND
1
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2
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.
Copyright © 2008–2012, Texas Instruments Incorporated