MDC_HDAS-524/528.B01 Page 1 of 5

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HDAS-524, HDAS-528

12-Bit, 400kHz

, Complete

Data Acquisition System

Figure 1. Functional Block Diagram

FEATURES

12-Bit resolution, 400kHz throughput

8 Channels single-ended or 4 channels

differential

Miniature, 40-pin, ceramic DDIP

Full scale input range from 100mV to 10V

Three-state outputs

No missing codes

Typical topology is shown.

GENERAL DESCRIPTION

The HDAS-524 and HDAS-528 are complete data acquisition systems. Each

contains an internal multiplexer, instrumentation amplifier, sample-hold,

analog-to-digital converter and three-state outputs. Packaged in miniature,

40-pin, double-dip packages, the HDAS-524/528 have a low power dissipation

of 2.6 Watts.

The HDAS-524 provides 4 differential inputs, and the HDAS-528 provides

8 single-ended inputs. An internal instrumenta- tion amplifier is characterized

for gains of 1, 2, 4, 8, 10 and 100. The gain range is selectable through a

single external resistor.

HDAS-524/528 OPERATION

The HDAS devices accept either 8 single-ended or 4 differential input signals.

Tie unused channels to SIGNAL GROUND, pin 14. Channel selection is

accomplished using the multiplexer address pins as shown in Table 1. Obtain

additional channels by connecting external multiplexers.

The acquisition time is the amount of time the multiplexer, instrumentation

amplifier and sample-hold require to settle within a specified range of accu-

racy. The acquisition time can be measured by how long EOC is low before

the rising edge of the START CONVERT pulse for continuous operation. Higher

PIN

FUNCTION

PIN

FUNCTION

1

CH0/CH0 HI

40

START CONVERT

2

CH1/CH1 HI

39

CA2

3

CH2/CH2 HI

38

CA1

4

CH3/CH3 HI

37

CA0

5

CH7/CH3 LO

36

+5V SUPPLY

6

CH6/CH2 LO

35

DIGITAL GROUND

7

CH5/CH1 LO

34

ENABLE

8

CH4/CH0 LO

33

BIT 1 (MSB)

9

COMP BIN

32

BIT 2

10

RGAIN LO

31

BIT 3

11

RGAIN HI

30

BIT 4

12

S/H OUT

29

BIT 5

13

+10V REFERENCE OUT

28

BIT 6

14

SIGNAL GROUND

27

BIT 7

15

GAIN ADJUST

26

BIT 8

16

OFFSET ADJUST

25

BIT 9

17

BIPOLAR

24

BIT 10

18

–15V SUPPLY

23

BIT 11

19

ANALOG GROUND

22

BIT 12 (LSB)

20

+15V SUPPLY

21

EOC

INPUT/OUTPUT CONNECTIONS

15

12

(524)

(528)

2 x 4:1

HDAS-524

MUX

8:1

HDAS-528

CH0/CH0 HI 1

CH1/CH1 HI 2

CH2/CH2 HI 3

CH3/CH3 HI 4

CH4/CH0 LO 8

CH5/CH1 LO 7

CH6/CH2 LO 6

CH7/CH3 LO 5

33 BIT 1 (MSB)

32 BIT 2

31 BIT 3

30 BIT 4

29 BIT 5

28 BIT 6

27 BIT 7

26 BIT 8

25 BIT 9

24 BIT 10

23 BIT 11

22 BIT 12 (LSB)

34

9

3 STATE

OUTPUT

SIGNAL GROUND 14

S/H

I/A

12-BIT

A/D

39

38

37

19

35

36

20

18

13

40

21

11

10

17

16

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