CAT504
8-Bit Quad DACpot
FEATURES
APPLICATIONS
■ Output settings retained without power
■ Output range includes both supply rails
■ 4 independently addressable outputs
■ 1 LSB Accuracy
■ Automated product calibration.
■ Remote control adjustment of equipment
■ Offset, gain and zero adjustments in Self-
Calibrating and Adaptive Control systems.
■ Tamper-proof calibrations.
■ Serial µP interface
■ Single supply operation: 2.7V-5.5V
■ Setting read-back without effecting outputs
DESCRIPTION
The CAT504 is a quad 8-Bit Memory DAC designed as
an electronic replacement for mechanical potentiom-
eters and trim pots. Intended for final calibration of
productssuchascamcorders,faxmachinesandcellular
telephones on automated high volume production lines,
it is also well suited for systems capable of self calibra-
tion, and applications where equipment which is either
difficult to access or in a hazardous environment, re-
quires periodic adjustment.
Control of the CAT504 is accomplished with a simple 3
wire serial interface. A Chip Select pin allows several
CAT504s to share a common serial interface and com-
munication back to the host controller is via a single
serial data line thanks to the CAT504’s Tri-Stated Data
Output pin.
The CAT504 operates from a single 3–5 volt power
supply drawing just a few milliwatts of power. When
storing data in EEPROM memory an additional 20 volt
low current supply is required.
The 4 independently programmable DAC's have an
output range which includes both supply rails. Output
settings, stored in non-volatile EEPROM memory, are
not lost when the device is powered down and are
automatically reinstated when power is returned. Each
output can be dithered to test new output values without
effecting the stored settings and stored settings can be
read back without disturbing the DAC’s output.
The CAT504 is available in the 0 to 70° C Commercial
and –40° C to + 85° C Industrial operating temperature
ranges and offered in 14-pin plastic DIP and Surface
mount packages.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
V
V
V
H
PP
DD
REF
DIP Package (P)
SOIC Package (J)
3
1
14
H
1
H
1
V
V
V
V
1
2
3
4
5
6
14
13
12
11
10
9
V
V
DD
1
2
3
4
5
6
14
13
12
11
10
9
DD
REF
REF
7
PROGRAM
CONTROL
PROG
CLK
CLK
OUT
13
12
11
10
6
OUT
V
1
2
3
4
DAC 1
DAC 2
OUT
2
3
4
2
3
4
V
V
V
V
PP
PP
OUT
V
OUT
OUT
V
OUT
V
OUT
CAT
504
CAT
504
CS
DI
CS
DI
5
2
DI
V
V
OUT
OUT
L
L
DATA
REGISTER
& EEPROM
DO
V
REF
GND
DO
V
REF
GND
SERIAL
CONTROL
CLK
PROG
PROG
8
7
8
7
DAC 3
DAC 4
V
OUT
4
CS
V
OUT
SERIAL
DATA
OUTPUT
REGISTER
DO
CAT504
8
9
GND
V
L
REF
Doc. No. 25048-0A 2/98 M-1
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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