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AD7264BCPZ Datasheet(PDF) 21 Page - Analog Devices

Part No. AD7264BCPZ
Description  1 MSPS, 14-Bit, Simultaneous Sampling SAR ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7264BCPZ Datasheet(HTML) 21 Page - Analog Devices

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AD7264
Data Sheet
Rev. D | Page 20 of 29
RS
RF
Cx–
Cx+
RS
SENSOR
COUTx
Figure 28. Recommended Comparator Connection Diagram
APPLICATION DETAILS
The AD7264 has been specifically designed to meet the require-
ments of any motor control shaft position feedback loop. The
device can interface directly to multiple sensor types, including
optical encoders, magnetoresistive sensors, and Hall effect sensors.
Its flexible analog inputs, which incorporate programmable gain,
ensure that identical board design can be utilized for a variety of
sensors, which results in reduced design cycles and costs.
The two simultaneous sampling ADCs are used to sample the
sine and cosine outputs from the sensor. No external buffering
is required between the sensor/transducer and the analog inputs
of the AD7264. The on-chip comparators can be used to monitor
the pole sensors, which can be Hall effect sensors or the inner
tracks from an optical encoder.
Figure 29 shows how the AD7264 can be used in a typical
application. An optical encoder is shown in Figure 29, but other
sensor types can as easily be used. Figure 29 indicates a typical
application configuration only; there are several other
configurations that render equally effective results.
VA+
VA
VB+
VB
VREFB
Z
B
A
U
V
W
COMP
COMP
H.E.
CB+
CB
CA+
CA
CD+
CD
CC+
CC
CA_CBVCC
CA_CB_GND
CC_CDVCC
CC_CD_GND
AGND
DGND
DOUTB
PD1
PD0/DIN
PD2
VREFA
AVCC
COMP
COMP
COMP
COMP
COUTC
COUTB
COUTA
COUTD
DOUTA
PGA
T/H
BUF
T/H
BUF
PGA
14-BIT
SUCCESSIVE
APPROXIMATION
ADC
REF
14-BIT
SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
OUTPUT
DRIVERS
OUTPUT
DRIVERS
OUTPUT
DRIVERS
OUTPUT
DRIVERS
VDRIVE
G3
G2
G1
G0
CAL
CS
SCLK
REFSEL
AD7264
OUTPUT
DRIVERS
OUTPUT
DRIVERS
Figure 29. Typical System Connection Diagram with Optical Encoder


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