Burr Brown Products
from Texas Instruments
AD
S7
863
AD
S
786
3
SBAS383 – JUNE 2007
Dual, 1.5MSPS, 12-Bit, 2 + 2 Channel, Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
•
•
•
•
•
•
•
•
Four Fully- or Six Pseudo-Differential Inputs
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
Operating Temperature Range: –40°C to
+125°C
Pin-Compatible with
and
(SSOP package)
DESCRIPTION
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
a critical performance characteristic in noisy
environments.
The ADS7863 is pin-compatible with the
but offers additional features such as a
programmable reference output, flexible supply
voltage (2.7V to 5.5V for AV
DD
and 1.65V to 5.5V for
BV
DD
), a pseudo-differential input multiplexer with
three channels per ADC, and several power-down
features.
The high-speed, dual serial interface is also
pin-compatible with the
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
AV
DD
CHA0+
CHA0-
CHA1+
CHA1-
Input
MUX
S/H
CDAC
Comparator
BV
DD
SDOA
SDOB
M0
APPLICATIONS
•
•
•
Motor Control
Multi-Axis Positioning Systems
Three-Phase Power Control
Serial Interface
M1
SDI
CLOCK
CS
RD
CHB0+
CHB0-
CHB1+
CHB1-
REF
IN
SAR
Input
MUX
S/H
CDAC
Comparator
BUSY
CONVST
BGND
REF
OUT
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
PRODUCT PREVIEW
BURR-BROWN [ BURR-BROWN CORPORATION ]
