ADS7863_08 Datasheet, PDF (1/40 Pages) Texas Instruments – Dual, 2MSPS, 12-Bit, 2 + 2 or 3 + 3 Channel, Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER

ADS7863
ADS7863
ADS7863
www.ti.com
SBAS383B – JUNE 2007 – REVISED MARCH 2008
Dual, 2MSPS, 12-Bit, 2 + 2 or 3 + 3 Channel, Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
1
•2 Four Fully- or Six Pseudo-Differential Inputs
• SNR: 71dB, THD: –81dB
• Programmable and Buffered Internal 2.5V
Reference
• Flexible Power-Down Features
• Variable Power-Supply Ranges: 2.7V to 5.5V
• Low-Power Operation: 45mW at 5V
• Operating Temperature Range: –40°C to
+125°C
• Pin-Compatible with ADS7861 and ADS8361
(SSOP package)
APPLICATIONS
• Motor Control
• Multi-Axis Positioning Systems
• Three-Phase Power Control
DESCRIPTION
The ADS7863 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 differential 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 ADS7863 is pin-compatible with the ADS7861,
but offers additional features such as a
programmable 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 ADS7863 is offered in an SSOP-24 and a
4x4mm QFN-24 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
SAR
S/H
CDAC
Comparator
S/H
CDAC
Comparator
SAR
BV_DD
SDOA
SDOB
M0
M1
SDI
CLOCK
CS
RD
BUSY
CONVST
BGND
REF_OUT
AGND
10-Bit DAC
2.5V Reference
Functional Block Diagram
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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 © 2007–2008, Texas Instruments Incorporated