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Battery Operated Equipment
Low Power, Ratiometric A/D Converters
Digitally Controlled Gain Circuits
Digitally Controlled Attenuators
CRT Character Generation
Low Noise Audio Gain Control
GENERAL DESCRIPTION
The MP7523/XRD7523 is a low cost multiplying Digital-to-
Analog Converter. The device uses an advanced thin-film-on-
CMOS technology to provide 8-bit resolution with accuracy to
10-bits and very low power dissipation.
The MP7523/XRD7523鈥檚 excellent multiplying characteris-
tics and low cost allow it to be used in a wide ranging field of ap-
plications such as: low noise audio gain control, CRT character
generation, motor speed control, digitally controlled attenuators,
etc.
SIMPLIFIED BLOCK DIAGRAM
V
DD
2R
V
REF
4R
4R
4R
4R
2R
2R
R
FB
4R
4R
4R
R
I
OUT1
I
OUT2
2 to 3 Decoder
Switch Drivers & Switches
R = 10k
BIT 1
MSB
BIT 8
LSB
3 Segment D/A Converter with Termination to DGND
Logical 鈥?鈥?at Digital Input Steers Current to I
OUT1
Rev. 3.00
E1996
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
(510) 668-7010