MP7643

1

Rev. 1.00

4-Channel, Programmable Gain

Voltage Output, 15 MHz Input Bandwidth

8-Bit DACs with Multiplying

Parallel Digital Data Port

FEATURES

• Programmable Gain

• 4 Independent 2-Quadrant Multiplying 8-Bit DACs

with Output Amplifiers

• 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:

15 MHz

• Very Low Noise Gain Control

• Low Power: 80mW

• Low AC Voltage Reference Feedthrough

• Excellent Channel-to-Channel Isolation

• DNL = +0.5 LSB, INL = +1 LSB (typ)

• DACs Matched to +0.5% (typ)

• 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)

• Multiplier Replacement

GENERAL DESCRIPTION

The MP7643 is ideal for digital gain control of high frequency

analog signals such as video, composite video and CCD. The

device includes 4-channels of high speed, wide 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) load. DNL of better than +0.5 LSB is achieved with a

channel-to-channel matching of typically 0.5%. Stability, match-

ing, and precision of the DACs are achieved by using MPS’ thin

film technology. Excellent channel-to-channel isolation is also

achieved with MPS’ BiCMOS process which cannot be

achieved using a typical CMOS technology.

An open loop architecture (patent pending) provides wide

feedthrough isolation. The negative feedback terminal of the

output op amp is available for user gain control. 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

mum system design.

The MP7643 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.

ORDERING INFORMATION

Package

Type

Temperature

Range

Part No.

Gain Error

(% FSR)

SOIC

–40 to +85

MP7643AS

+0.5

+1+1.5

Plastic Dip

–40 to +85

MP7643AN

+0.5

+1+1.5

INL

(LSB)

DNL

(LSB)