DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

DAC-88 Series

High-Performance, 12-Bit DACs with Input Registers

MDA_DAC-88.A01 Page 1 of 6

Figure 1. DAC-88 Functional Block Diagram

MSB

BITS

LSB

1

LOAD 19

+5V

2 3 4

+15V

SUPPLY

22

14

13

18

20

SUMMING

JUNCTION

15

VOLTAGE

OUTPUT

21

5 6 7 8

9 10 11 12

REF.

OUT

24

BIPOLAR

OFFSET

17

GAIN

ADJUST

23

REF.

IN

16

REGISTER

74LS75

REGISTER

74LS75

REGISTER

74LS75

D/A CONVERTER

DIGITAL INPUTS

GROUND

10V RANGE

+5V

SUPPLY

–15V

SUPPLY

1 2 3 4

5 6 7 8

9 10 11 12

BLOCK DIAGRAM

The DAC-88 Series D/A converters are high

performance 12-bit devices with a fast settling

voltage output. They are compatible and pin-pin

replacement for the standard DAC88 and 3860

series. They incorporate a level-controlled input

storage register and are specifically designed for

systems applications such as data bus interfacing

with computers. When the “load/Register Enable”

input is high, data in the storage register is held,

and when the load input is low, data is transferred

through to the DAC. There are two basic models

available by coding option: binary and two’s com-

plement. The output voltage ranges are externally

pin programmable and include 0 to +10V, ±5V,

and ±10V. The DAC-88 Series contains a precision

zener reference circuit. This eliminates code-

dependent ground currents by routing current from

the positive supply to the internal ground node

as determined by the R-2R ladder network. The

internal feedback resistors for the on-board ampli-

fier track the ladder network resistors, enhancing

temperature performance. The excellent tracking

of the resistors results in a differential nonlinearity

tempco of ±2ppm/°C maximum. The temperature

coefficient of gain is ±20ppm/°C maximum, and

the tempco of zero is ±5ppm/°C maximum.

PRODUCT OVERVIEW

INPUT/OUTPUT CONNECTIONS

PIN

FUNCTION

PIN

FUNCTION

1

BIT 1 (MSB)

24

REFERENCE OUT

2

BIT 2

23

GAIN ADJUST

3

BIT 3

22

+15V SUPPLY

4

BIT 4

21

GROUND

5

BIT 5

20

SUMMING JUNCTION

6

BIT 6

19

LOAD/Register Enable

7

BIT 7

18

10V RANGE

8

BIT 8

17

BIPOLAR OFFSET

9

BIT 9

16

REFERENCE IN

10

BIT 10

15

VOLTAGE OUTPUT

11

BIT 11

14

–15V SUPPLY

12

BIT 12 (LSB)

13

+5V SUPPLY

FEATURES

12-Bit resolution

Integral nonlinearity error ±1/2LSB, max.

Differential nonlinearity error ±3/4LSB, max.

MIL-STD-883 high-reliability versions available

Input register

3μs fast output settling time

Guaranteed monotonicity over full temperature

range