MP7641

1

Rev. 2.00

8-Channel Voltage Output

10 MHz Input Bandwidth 8-Bit

Multiplying DACs with

Serial Digital Port

FEATURES

• 8 Independent 2-Quadrant Multiplying 8-Bit DACs

• Dual Positive (+10 V and +5 V) Supplies or

Dual (+5 V) Supplies Capability

• High Speed:

–

12.5 MHz Digital Clock Rate

(typ)

–

Voltage Reference Input Bandwidth:

10 MHz

• Low Power: 150mW

• Low AC Voltage Reference Feedthrough

• Excellent Channel-to-Channel Isolation

• DNL = +0.8 LSB, INL = +1 LSB (typ)

• DACs Matched to +0.5% (typ)

• Chip Select Available: MP7651

• Low Harmonic Distortion: 0.25% typical with

• Latch-Up Free

• ESD Protection: 2000 V Minimum

APPLICATIONS

• Direct High-Frequency Automatic Gain Control

• Video AGC & CCD Level AGC

• Convergence Adjustment for High-Resolution

Monitors (Workstations)

GENERAL DESCRIPTION

The MP7641 is ideal for direct gain control of video, compos-

ite video, CCD and other high frequency analog signals. The de-

vice includes 8-channels of high speed, high bandwidth, two

quadrant multiplying, 8-bit accurate digital-to-analog converter.

It includes an output drive buffer per channel capable of driving a

+1mA (typ) to a load. DNL of better than +0.8 LSB is achieved

with a channel-to-channel matching of better than 0.5% (typ).

Stability, matching, and precision of the DACs are achieved by

using EXAR’s thin film technology. Also, excellent channel-to-

channel isolation is achieved with EXAR’s BiCMOS process

which cannot be achieved using a typical CMOS technology.

An open loop architecture (patent pending) provides wide

–65dB or better. In addition, low distortion in the order of 0.25%

with a 1 V p-p, 1 MHz signal is achieved.

The combination of a constant input Z and the ability to vary

AGND within +300 mV allows flexibility for optimum system de-

sign.

The MP7641 has a serial data 3-wire standard

logic interface to reduce pin count, package size, and board wire

(space).

The MP7641 is fabricated on a junction isolated, high speed

process enables precision high speed analog/digital (mixed-

mode) circuits to be fabricated on the same chip.