MP7643
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
– V
REF to
V
OUT
Settling Time: 150ns to 8-bit
(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
V
REF
= 1 V p-p @ 1 MHz
•
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
small signal bandwidth from V
REF
to output up to 15 MHz (typ),
fast output settling time of 150 ns, and excellent V
REF
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
V
REFN
within V
CC
–1.8 V to V
EE
+1.5 V allows flexibility for opti-
mum system design.
The MP7643 is fabricated on a junction isolated, high speed
BiCMOS (BiCMOS IV
TM
) process with thin film resistors. This
process enables precision high speed analog/digital (mixed-
mode) circuits to be fabricated on the same chip.
ORDERING INFORMATION
Package
Type
SOIC
Plastic Dip
Temperature
Range
–40 to +85
°
C
–40 to +85
°
C
Part No.
MP7643AS
MP7643AN
INL
(LSB)
+1
+1
DNL
(LSB)
+0.5
+0.5
Gain Error
(% FSR)
+1.5
+1.5
Rev. 1.00
1
EXAR [ EXAR CORPORATION ]
