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ADS7863
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SBAS383–JUNE 2007
Dual, 1.5MSPS, 12-Bit, 2 + 2 Channel, Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
DESCRIPTION
•
•
•
Four Fully- or Six Pseudo-Differential Inputs
The ADS7863 is
a
dual, 12-bit, 1.5MSPS,
analog-to-digital converter (ADC) with four fully
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 80dB at 50kHz, which is
SINAD: 70dB (min), THD: –75dB (max)
Programmable and Buffered Internal 2.5V
Reference
•
•
•
•
Flexible Power-Down Features
Variable Power Supply Ranges
Low Power Operation: 40mW at 5V
a
critical performance characteristic in noisy
Operating Temperature Range: –40°C to
+125°C
environments.
The ADS7863 is pin-compatible with the ADS8361,
but offers additional features such as
programmable reference output, flexible supply
voltage (2.7V to 5.5V for AVDD and 1.65V to 5.5V for
BVDD), a pseudo-differential input multiplexer with
three channels per ADC, and several power-down
features.
•
Pin-Compatible with ADS7861 and ADS8361
(SSOP package)
a
APPLICATIONS
•
•
•
Motor Control
Multi-Axis Positioning Systems
Three-Phase Power Control
The high-speed, dual serial interface is also
pin-compatible with the ADS7861 while offering
additional flexibility. 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.
SAR
BVDD
AVDD
SDOA
SDOB
M0
CHA0+
CHA0-
Input
CDAC
S/H
MUX
CHA1+
M1
CHA1-
Comparator
SDI
CLOCK
CHB0+
CS
RD
CHB0-
Input
CDAC
S/H
MUX
CHB1+
BUSY
CHB1-
Comparator
CONVST
REFIN
BGND
SAR
REFOUT
AGND
10-Bit DAC
2.5V Reference
Functional Block Diagram
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.
All trademarks are the property of their respective owners.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2007, Texas Instruments Incorporated