GENERAL DESCRIPTION

The MP7641 is ideal for direct gain control of video, composite video, CCD and other high frequency analog signals. The device 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-tochannel isolation is achieved with EXAR’s BiCMOS process which cannot be achieved using a typical CMOS technology.

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)