SBAS253 MAY 2003
12 Bit, 12 Channel
ANALOG TO DIGITAL CONVERTER
ADS7869
FEATURES
D
Seven Sample-and-Hold Capacitors
D
Fully Differential Inputs
D
Flexible Digital Interface
D
UpDown Counter On-Chip
D
12-Bit Gain Adjustment for Every Channel
D
10-Bit Offset Adjustment for Every Channel
D
Three Interface Modes
APPLICATIONS
D
Motor Control
DESCRIPTION
The ADS7869 is a motor-control front-end that includes three
analog-to-digital converters (ADCs) with a total of seven
sample-and-hold capacitors and 12 fully differential input
channels. Connected to four input channels are four sign
comparators. There are also three additional fully differential
that are each connected to a window comparator and a sign
comparator.
The ADS7869 also offers a very flexible interface with a
parallel port that can be configured to two different standards.
In addition, a serial peripheral interface (SPI) and a
specialized serial interface with three data lines are provided.
In this way, the ADS7869 will interface to every digital signal
processor (DSP) or microcontroller. The chip is specialized
for motor-control applications. For the encoder analyses, two
up-down counters are added to ensure that the analog input
of the encoder is held at the same point of time as the counter
value.
PRODUCT PREVIEW
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2003, Texas Instruments Incorporated
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