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MP7641AS

8-Channel Voltage Output 10 MHz Input Bandwidth 8-Bit Multiplying DACs with Serial Digital Port

Exar Corporation 

MP7641

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

– VREF to VOUT Settling Time: 150ns to 8–bit

(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

VREF = 1 V p-p @ 1 MHz

• VREF/2 Output Preset Level

• 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

small signal bandwidth from VREF to output up to 10 MHz (typ),

fast output settling time, and VREF feedthrough isolation of

–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 µ-processor

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

(space).

The MP7641 is fabricated on a junction isolated, high speed

BiCMOS (BiCMOS IVTM) process with thin film resistors. This

process enables precision high speed analog/digital (mixed-

mode) circuits to be fabricated on the same chip.

Rev. 2.00

1

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