SPT9712

12-BIT, 100 MWPS ECL D/A CONVERTER

TECHNICAL DATA

FEBRUARY 15, 2001

APPLICATIONS

• Fast frequency hopping spread spectrum radios

• Direct sequence spread spectrum radios

• Microwave and satellite modems

• Test & measurement instrumentation

FEATURES

• 12-Bit, 100 MWPS digital-to-analog converter

• ECL compatibility

• Low power: 600 mW

• 1/2 LSB DNL

• 40 MHz multiplying bandwidth

• Industrial temperature range

• Superior performance over AD9712

– Improved settling time of 13 ns

– Improved glitch energy 15 pV-s

– Master-slave latches

GENERAL DESCRIPTION

The SPT9712 is a 12-bit, 100 MWPS digital-to-analog

converter designed for direct digital synthesis, high reso-

lution imaging, and arbitrary waveform generation applica-

tions.

This device is pin-for-pin compatible with the AD9712 with

significantly improved performance. The only difference

between the SPT9712 and the AD9712 is that the Latch

Enable (LE, pin 26) for the SPT9712 is rising-edge trig-

gered (see figure 1), whereas the Latch Enable (LE, pin

26) for the AD9712 functions in the transparent mode.

The SPT9712 is an ECL-compatible device. It features a

fast settling time of 13 ns and low glitch impulse energy of

15 pV-s, which results in excellent spurious-free dynamic

range characteristics.

The SPT9712 is available in a 28-lead PLCC package in

the industrial temperature range (–40 to +85 °C).

BLOCK DIAGRAM

Control Amp In

(MSB)

Latch Enable

Digital

Inputs

D1

through

D12

Ref In

Decoders

and

Drivers

(LSB)

–

Control

Amp

+

Control

Amp Out

Internal

Voltage

Reference

Ref Out

Switch

Network