ADS7861 Datasheet, PDF (1/15 Pages) Burr-Brown (TI) – Dual, 500kHz, 12-Bit, 2 2 Channel, Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER

®
ADS7861
ADS7861
Dual, 500kHz, 12-Bit, 2 + 2 Channel,
Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 4 INPUT CHANNELS
q FULLY DIFFERENTIAL INPUTS
q 2µs TOTAL THROUGHPUT PER CHANNEL
q GUARANTEED NO MISSING CODES
q 1MHz EFFECTIVE SAMPLING RATE
q LOW POWER: 40mW
q SSI SERIAL INTERFACE
APPLICATIONS
q MOTOR CONTROL
q MULTI-AXIS POSITIONING SYSTEMS
q 3-PHASE POWER CONTROL
DESCRIPTION
The ADS7861 is a dual, 12-bit, 500kHz, analog-to-
digital converter with 4 fully differential input channels
grouped into two pairs for high speed, simultaneous
signal acquisition. Inputs to the sample-and-hold ampli-
fiers are fully differential and are maintained differen-
tial 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 ADS7861 offers a high speed, dual serial interface
and control inputs to minimize software overhead. The
output data for each channel is available as a 12-bit
word. The ADS7861 is offered in a 24-lead SSOP
package and is fully specified over the –40°C to +85°C
operating range.
CH A0+
CH A0–
CH A1+
CH A1–
REF_IN
REF_OUT
CH B0+
CH B0–
CH B1+
CH B1–
SHA
CDAC
SAR
COMP
Internal
2.5V
Reference
SHA
CDAC
COMP
SAR
Serial
Interface
SERIAL DATA A
SERIAL DATA B
M0
M1
A0
CLOCK
CS
RD
BUSY
CONVST
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© 1998 Burr-Brown Corporation
PDS-1508A
Printed in U.S.A. December, 1998