®
ADS
786
1
ADS7861
Dual, 500kHz, 12-Bit, 2 + 2 Channel,
Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
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4 INPUT CHANNELS
FULLY DIFFERENTIAL INPUTS
2
µ
s TOTAL THROUGHPUT PER CHANNEL
GUARANTEED NO MISSING CODES
1MHz EFFECTIVE SAMPLING RATE
LOW POWER: 40mW
SSI SERIAL INTERFACE
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.
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–
SAR
SHA
CDAC
CH A1+
CH A1–
COMP
SERIAL DATA A
SERIAL DATA B
M0
REF
IN
Internal
2.5V
Reference
Serial
Interface
M1
A0
CLOCK
CS
REF
OUT
CH B0+
CH B0–
SHA
CDAC
COMP
RD
BUSY
CONVST
CH B1+
CH B1–
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 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1998 Burr-Brown Corporation
PDS-1508A
Printed in U.S.A. December, 1998
SBAS110
ETC [ ETC ]
