MP7651
8-Channel, Voltage Output
10 MHz Input Bandwidth 8-Bit Multiplying
DACs with Serial Digital Data Port
and Chip Select Decoder
FEATURES
•
8 Independent 2-Quadrant Multiplying 8-Bit DACs
•
Serial Digital Input Data and Address Port (3-Wire
Standard) plus Internal Chip Address Decoder©
•
Dual Supplies (+5 V typ.)
•
High Speed:
– 12.5 MHz Digital Clock Rate
– V
REF
to V
OUT
Settling Time: 150ns to
8-bit (typ)
– Voltage Reference Input Bandwidth:
10 MHz (typ)
•
Low Power: 150mW (typ)
•
Low AC Voltage Reference Feedthrough
•
Excellent Channel-to-Channel Isolation
•
DNL = +0.8 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
•
V
REF
/2 Output Preset Level
•
Latch-Up Proof
•
Greater than 2000 V ESD Protection
APPLICATIONS
•
ATE
•
Process Control (Low Noise)
•
Convergence Adjustment for High
Resolution Monitors (Work Stations)
•
Digital Gain/Attenuation/Offset Control
•
Trimmer Replacement
GENERAL DESCRIPTION
The MP7651 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
+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%. Stabil-
ity, matching, and precision of the DACs is achieved by using
EXAR’s thin film technology. Also, excellent channel-to-channel
isolation is achieved with EXAR’s BiCMOS process which can-
not 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 10 MHz (typ),
fast output settling time, and V
REF
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.
A specified and constant input impedance of each V
REF+
in-
put gives flexibility for optimal system design. The serial data
3-wire standard
µ-processor
logic interface reduces pin count,
package size (28 pin), and board wire (space). Additionally, the
internal chip select decoder allows for easy daisy chaining with-
out the addition of separate control logic.
MP7651 is fabricated on a junction isolated, high speed, dual
metal, linear compatible BiCMOS (BiCMOS IV
TM
) thin film resis-
tors. This process enables precision high speed analog/digital
(mixed-mode) circuits to be fabricated on the same chip.
Rev. 2.00
1
EXAR [ EXAR CORPORATION ]
