ADS7861_14 Datasheet, PDF (1/33 Pages) Texas Instruments – Dual, 500kSPS, 12-Bit, 2 + 2 Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER

ADS7861
ADS7861
ADS7861
SBAS110D – DECEMBER 1998 – REVISED AUGUST 2007
Dual, 500kSPS, 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 NO MISSING CODES
q 1MHz EFFECTIVE SAMPLING RATE
q LOW POWER: 40mW
q SSI SERIAL INTERFACE
q OPERATING TEMPERATURE RANGE:
–40°C to +125°C
APPLICATIONS
q MOTOR CONTROL
q MULTI-AXIS POSITIONING SYSTEMS
q 3-PHASE POWER CONTROL
CH A0+
CH A0–
CH A1+
CH A1–
REF_IN
REF_OUT
CH B0+
CH B0–
DESCRIPTION
The ADS7861 is a dual, 12-bit, 500kSPS, Analog-to-Digital
(A/D) converter with four fully differential input channels
grouped into two pairs for high speed, simultaneous signal
acquisition. Inputs to the sample-and-hold amplifiers are fully
differential and are maintained differential to the input of the
A/D converter. This provides excellent common-mode rejec-
tion 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 both an SSOP-24 and a QFN-32 package and is
fully specified over the –40°C to +125°C operating range.
SHA
CDAC
SAR
COMP
Internal
2.5V
Reference
SHA
CDAC
COMP
Serial
Interface
SERIAL DATA A
SERIAL DATA B
M0
M1
A0
CLOCK
CS
RD
BUSY
CONVST
CH B1+
CH B1–
SAR
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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