AD7862AR-2 datasheet(15/16 Pages) AD

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AD7862

–15–

REV. 0

VOLTAGE

ATTENUATORS

DAC

TORQUE

SETPOINT

*ADDITIONAL PINS OMITTED FOR CLARITY

TORQUE & FLUX

CONTROL LOOP

CALCULATIONS &

TWO TO THREE

PHASE

INFORMATION

TRANSFORMATION

TO TORQUE &

FLUX CURRENT

COMPONENTS

FLUX

SETPOINT

DRIVE

CIRCUITRY

ISOLATION

AMPLIFIERS

AD7862*

DSP

MICROPROCESSOR

PHASE

MOTOR

Figure 19. Vector Motor Control Using the AD7862

MULTIPLE AD7862S

Figure 20 shows a system where a number of AD7862s can be

configured to handle multiple input channels. This type of

configuration is common in applications such as sonar, radar,

etc. The AD7862 is specified with typical limits on aperture

delay. This means that the user knows the difference in the

sampling instant between all channels. This allows the user to

maintain relative phase information between the different

channels.

A common read signal from the microprocessor drives the RD

input of all AD7862s. Each AD7862 is designated a unique

address selected by the address decoder. The reference output

of AD7862 number 1 is used to drive the reference input of all

other AD7862s in the circuit shown in Figure 20. One VREF

pin can drive several AD7862 REF IN pins. Alternatively, an

external or system reference can be used to drive all VREF

inputs. A common reference ensures good full-scale tracking

between all channels.

AD7862(1)

AD7862(2)

AD7862(n)

ADDRESS

VREF

REF IN

ADDRESS

DECODE

Figure 20. Multiple AD7862s in Multichannel System

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