1 ADS7864
®
500kHz, 12-Bit, 6-Channel
Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
l 6 SIMULTANEOUS SAMPLING CHANNELS
l FULLY DIFFERENTIAL INPUTS
l 2µs TOTAL THROUGHPUT PER CHANNEL
l GUARANTEED NO MISSING CODES
l PARALLEL INTERFACE
l 1MHz EFFECTIVE SAMPLING RATE
l LOW POWER: 50mW
l 6X FIFO
APPLICATIONS
l MOTOR CONTROL
l MULTI-AXIS POSITIONING SYSTEMS
l 3-PHASE POWER CONTROL
DESCRIPTION
The ADS7864 is a dual 12-bit, 500kHz Analog-to-
Digital (A/D) converter with 6 fully differential input
channels grouped into three pairs for high speed simul-
taneous signal acquisition. Inputs to the sample-and-
hold amplifiers are fully differential and are main-
tained differential to the input of the A/D converter.
This provides excellent common-mode rejection of
80dB at 50kHz which is important in high noise
environments.
The ADS7864 offers a parallel interface and control
inputs to minimize software overhead. The output data
for each channel is available as a 16-bit word (address
and data). The ADS7864 is offered in a TQFP-48
package and is fully specified over the –40°C to +85°C
operating range.
ADS7864
Copyright © 2000, Texas Instruments Incorporated PDS-1581A Printed in U.S.A. September, 2000
SAR
Interface
Conversion
and
Control
FIFO
Registers
COMP
CS
CLOCK
BYTE
A0
Channel/
Data Output
16
RESET
BUSY
RD
A1
A2
CDAC
Internal
2.5V
Reference
CH A0–
CH A0+
CH B0–
CH B0+
HOLDA
HOLDB
HOLDC
REF
IN
CH C1–
CH C1+
SAR
COMP
CDAC
MUX
MUX
CH A1–
CH A1+
CH B1–
CH B1+
S/H
Amp
S/H
Amp
S/H
Amp
S/H
Amp
S/H
Amp
S/H
Amp
CH C1–
CH C1+
REF
OUT
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
http://www.burr-brown.com/ http://www.ti.com/
ADS7864

SBAS141