1

GND

CLK

CS

DI

DO

DVD

PROG

RDY/BSY

VREF H1

1

2

3

4

5

6

7

10

9

8

20

19

18

17

14

13

12

11

16

15

VREF H4

VREF H4

VREF H3

VREF L1

V

REF

L2

VREF L4

V

REF

L3

VOUT1

V

OUT

2

V

OUT

3

V

OUT

4

GND

CLK

CS

DI

DO

DVD

PROG

RDY/BSY

VREF H1

1

2

3

4

5

6

7

10

9

8

20

19

18

17

14

13

12

11

16

15

VREF H4

VREF H4

VREF H3

VREF L1

V

REF

L2

VREF L4

V

REF

L3

VOUT1

V

OUT

2

V

OUT

3

V

OUT

4

CAT515

8-Bit Quad Digital POT with Independent Reference Inputs

FEATURES

APPLICATIONS

Calibrating and Adaptive Control systems.

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.

GND

DAC 3

DAC 2

16

EEPROM

LATCH

EEPROM

LATCH

EEPROM

LATCH

EEPROM

LATCH

17

DAC 1

18

15

13

14

12

DAC 4

V

4

OUT

PROG

RDY/BSY

PROGRAM

CONTROL

H.V.

CHARGE

PUMP

SERIAL DATA OUTPUT

V

L4

REF

V

H4

REF

V

3

OUT

V

L3

REF

V

H3

REF

V

2

OUT

V

L2

REF

V

H2

REF

V

1

OUT

V

L1

REF

V

H1

REF

DO

V

DD

DATA

CONTROLLER

1

2

5

CLK

CS

DI

4

6

7

9

20

19

11

10

3

8

FUNCTIONAL DIAGRAM

PIN CONFIGURATION

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.

DIP Package (P)

SOIC Package (J)

CAT515

CAT515

CAT515

© 2000 by Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

Doc. No. 25077-00 2/98 M-1