AD7264BSTZ datasheet(19/32 Pages) AD

19 / 32 page

AD7264

Rev. A | Page 19 of 32

Cx–

Cx+

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 could 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

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

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

CAL

SCLK

REFSEL

AD7264

OUTPUT

DRIVERS

OUTPUT

DRIVERS

Figure 29. Typical System Connection Diagram with Optical Encoder

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