Burr Brown Products
from Texas Instruments
ADS7864
SBAS141A – SEPTEMBER 2000 – REVISED MARCH 2005
500kHz, 12-Bit, 6-Channel Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
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6 Simultaneous Sampling Channels
Fully Differential Inputs
2µs Total Throughput per Channel
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 differen-
tial input channels grouped into three 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 re-
jection 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
Motor Control
Multi-Axis Positioning Systems
3-Phase Power Control
HOLDA
CH A0+
CH A0−
CH B0+
CH B0−
S/H
Amp
CDAC
Conversion
and
Control
SAR
S/H
Amp
COMP
Interface
A2
A1
A0
BYTE
CLOCK
CS
Internal
2.5V
Reference
FIFO
Registers
HOLDB
HOLDC
CH C1+
CH C1−
S/H
Amp
MUX
REF
IN
REF
OUT
RD
BUSY
RESET
Channel/
Data Output
CH A1+
CH A1−
S/H
Amp
CH B1+
CH B1−
CH C1+
CH C1−
S/H
Amp
MUX
SAR
S/H
Amp
CDAC
COMP
16
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2005, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
