CAT515 Datasheet, PDF (1/12 Pages) Catalyst Semiconductor – 8-Bit Quad Digital POT with Independent Reference Inputs

CAT515
8-Bit Quad Digital POT with Independent Reference Inputs
FEATURES
APPLICATIONS
s Output settings retained without power
s Independent Reference Inputs
s Output range includes both supply rails
s Programming voltage generated on-chip
s 4 independently addressable outputs
s Serial µP interface
s Single supply operation: 2.7V-5.5V
s Automated product calibration.
s Remote control adjustment of equipment
s Offset, gain and zero adjustments in Self-
Calibrating and Adaptive Control systems.
s Tamper-proof calibrations.
DESCRIPTION
The CAT515 is a quad 8-Bit Memory DAC designed as
an electronic replacement for mechanical potentiom-
eters and trim pots. Intended for final calibration of
products such as camcorders, fax machines and cellular
telephones on automated high volume production lines
and systems capable of self calibration, it is also well
suited for applications were equipment requiring peri-
odic adjustment is either difficult to access or located in
a hazardous environment.
The CAT515 offers 4 independently programmable DACs
each having its own reference inputs and each capable
of rail to rail output swing. Output settings, stored 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.
FUNCTIONAL DIAGRAM
V _DD
3
Control of the CAT515 is accomplished with a simple 3
wire serial interface. A Chip Select pin allows several
CAT515's to share a common serial interface and com-
munications back to the host controller is via a single
serial data line thanks to the CAT515’s Tri-Stated Data
Output pin. A RDY/BSYoutput working in concert with
an internal low voltage detector signals proper operation
of EEPROM Erase/Write cycle.
The CAT515 operates from a single 3–5 volt power
supply. The high voltage required for EEPROM Erase/
Write operations is generated on-chip.
The CAT515 is available in the 0°C to 70°C Commercial
and –40°C to +85°C Industrial operating temperature
ranges and offered in 20-pin plastic DIP and Surface
mount packages.
PIN CONFIGURATION
5
RDY/BSY
9
PROG
PROGRAM
CONTROL
SERIAL DATA OUTPUT
EEPROM
LATCH
DAC 1
CLK
4
6
CS
DI
7
DATA
CONTROLLER
EEPROM
LATCH
DAC 2
EEPROM
LATCH
DAC 3
H.V.
CHARGE
PUMP
CAT515
EEPROM
LATCH
DAC 4
10
GND
8
DO
2
VREF H1
18
VOUT 1
11
VREF L1
1
VREF H2
17
VOUT 2
12
VREF L2
20
VREF H3
16
VOUT 3
13
VREF L3
19
VREF H4
15
VOUT 4
14
VREF L4
DIP Package (P)
SOIC Package (J)
VREF ^H4
VREF ^H1
DVD
CLK
RDY/BSY
CS
DI
DO
PROG
GND
1
20
2
19
3
18
4
17
5 _CAT51516
6
15
7
14
8
13
9
12
10
11
VREF ^H3 VREF ^H4
VREF ^H4 _VREF H1
VOUT1
DVD
VOUT2
CLK
VOUT3
VOUT4
RDY/BSY
CS
VREF ^L4
DI
VREF L3
DO
VREF L2
VREF ^L1
PROG
GND
1
20
2
19
3
18
4
17
5
16
CAT515
6
15
7
14
8
13
9
12
10
11
VREF ^H3
VREF ^H4
VOUT1
VOUT2
VOUT3
VOUT4
VREF ^L4
VREF L3
VREF L2
VREF ^L1
© 2000 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25077-00 2/98 M-1