ADS7864
ADS
786
4
500kHz, 12-Bit, 6-Channel
Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
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q
q
q
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6 SIMULTANEOUS SAMPLING CHANNELS
FULLY DIFFERENTIAL INPUTS
2
µ
s TOTAL THROUGHPUT PER CHANNEL
GUARANTEED NO MISSING CODES
PARALLEL INTERFACE
1MHz EFFECTIVE SAMPLING RATE
LOW POWER: 50mW
6X FIFO
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.
APPLICATIONS
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MOTOR CONTROL
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MULTI-AXIS POSITIONING SYSTEMS
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3-PHASE POWER CONTROL
CH A0+
CH A0–
HOLDA
SAR
S/H
Amp
COMP
S/H
Amp
Interface
CDAC
Conversion
and
Control
A2
A1
A0
BYTE
CLOCK
CS
Internal
2.5V
Reference
FIFO
Registers
S/H
Amp
COMP
CDAC
S/H
Amp
RD
BUSY
RESET
Channel/
Data Output
HOLDB
CH B0+
CH B0–
HOLDC
CH C1+
CH C1–
S/H
Amp
REF
IN
MUX
REF
OUT
CH A1+
CH A1–
16
CH B1+
CH B1–
CH C1+
CH C1–
S/H
Amp
MUX
SAR
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/
®
Copyright © 2000, Texas Instruments Incorporated
PDS-1581A
1
Printed in U.S.A. September, 2000
ADS7864
SBAS141
BURR-BROWN [ BURR-BROWN CORPORATION ]
