AD5533

–8–

REV. 0

PIN FUNCTION DESCRIPTIONS

Pin

Function

AGND(1–2)

Analog GND Pins.

Analog Supply Pins. Voltage range from 4.75 V to 5.25 V.

DGND

Digital GND Pins.

Digital Supply Pins. Voltage range from 2.7 V to 5.25 V.

DAC_GND(1–2)

Reference GND Supply for All the DACs.

REF_IN

Reference Voltage for Channels 0–31.

REF_OUT

Reference Output Voltage.

Analog Output Voltages from the 32 Channels.

Analog Input Voltage. Connect this to AGND if operating in DAC mode only.

A4–A1

Parallel Interface: 5-Address Pins for 32 Channels. A4 = MSB of Channel Address. A0 = LSB.

CS/SYNC

This pin is both the active low Chip Select pin for the parallel interface and the Frame Synchronization pin

for the serial interface.

Parallel Interface: Write pin. Active low. This is used in conjunction with the

CS pin to address the device

using the parallel interface.

OFFSET_SEL

1

Parallel Interface: Offset Select Pin. Active high. This is used to select the offset channel.

SCLK

2

Serial Clock Input for Serial Interface. This operates at clock speeds up to 20 MHz.

2

Data Input for Serial Interface. Data must be valid on the falling edge of SCLK.

Output from the DAC Registers for readback. Data is clocked out on the rising edge of SCLK and is valid

on the falling edge of SCLK.

SER/

This pin allows the user to select whether the serial or parallel interface will be used. If the pin is tied low,

the parallel interface will be used. If it is tied high, the serial interface will be used.

OFFS_IN

Offset Input. The user can supply a voltage here to offset the output span. OFFS_OUT can also be tied to

this pin if the user wants to drive this pin with the Offset Channel.

OFFS_OUT

Offset Output. This is the acquired/programmed offset voltage which can be tied to the OFFS_IN pin

to offset the span.

BUSY

This output tells the user when the input voltage is being acquired. It goes low during acquisition and

returns high when the acquisition operation is complete.

of

TRACK. See TRACK Input section for further information. This input can also be used as a means of

resetting the complete device to its power-on-reset conditions. This is achieved by applying a low-going

pulse of between 50 ns and 150 ns to this pin. See section on

RESET Function for further details.

NOTES