REV. A

AD5532B

–12–

TRACK

DAC

ACQUISITION

CIRCUIT

BUSY

OUTPUT

STAGE

CONTROLLER

THRESHOLD

VOLTAGE

PIN

DRIVER

DEVICE

UNDER

TEST

ONLY ONE CHANNEL SHOWN FOR SIMPLICITY

AD5532B

Figure 9. Typical ATE Circuit Using

TRACK Input

of the pin driver, the comparator output switches. The

µC/µP

then knows what code is required to be input in order to obtain

the desired voltage at the DUT. The

TRACK input is now

BUSY goes low until V

MODES OF OPERATION

The AD5532B can be used in four different modes of oper-

ation. These modes are set by two mode bits, the first two bits in

the serial word.

OFFSET SEL

A4 –A0

CAL

0

0

MSB

MODE BITS

0

TEST BIT

LSB

MODE BIT 1 MODE BIT 2

a. 10-Bit Input Serial Write Word (ISHA Mode)

OFFSET SEL

A4 –A0

CAL

1

0

MSB

MODE BITS

0

TEST BIT

LSB

DB13–DB0

b. 24-Bit Input Serial Write Word (DAC Mode)

OFFSET SEL

A4 –A0

CAL

0

1

MSB

LSB

MODE BITS

DB1 3 –DB0

0

TEST BIT

10-BIT

SERIAL WORD

WRITTEN TO PART

14-BIT DATA

READ FROM PART AFTER

NEXT FALLING EDGE OF

SYNC

(DB13 = MSB OF DAC WORD)

MSB

LSB

c. Input Serial Interface (Acquire and Readback Mode)

OFFSET SEL

A4 –A0

CAL

1

1

MSB

LSB

MODE BITS

DB1 3 –DB0

0

TEST BIT

10-BIT

SERIAL WORD

WRITTEN TO PART

14-BIT DATA

READ FROM PART AFTER

NEXT FALLING EDGE OF

SYNC

(DB13 = MSB OF DAC WORD)

MSB

LSB

d. Input Serial Interface (Readback Mode)

Figure 10. Serial Interface Formats

Table II. Modes of Operation

Mode Bit 1

Mode Bit 2

Operating Mode

00

ISHA Mode

01

DAC Mode

10

Acquire and Readback

11

Readback

1. ISHA Mode

In this mode, a channel is addressed and that channel