MDC_HDAS-16/8.B01 Page 3 of 7

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HDAS-16, HDAS-8

POWER REQUIREMENTS

MIN.

TYP.

MAX.

UNITS

Power Supply Ranges

+15V Supply

+14.5

+15.0

+15.5

Volts

–15V Supply

–14.5

–15.0

–15.5

Volts

+5VSuppy

+4.75

+5.0

+5.25

Volts

Power Supply Currents

+15VSupply

—

—

+33

mA

–15V Supply

—

—

–30

mA

+5VSuppy

—

—

+15

mA

PowerDissipation

—

—

1.25

Watts

PHYSICAL/ENVIRONMENTAL

Operating Temp. Range, Case

MC Models

0

—

+70

°C

MM/883 Models

–55

—

+125

°C

StorageTemperatureRange

–65

—

+150

°C

Weight

1.4 ounces (39.7 grams)

PackageType

62-pin cermanic DIP

Footnotes:

Analog inputs will withstand ±35V with power on. If the power is off, the maximum

safe input (no damage) is ±20V.

The gain equation error is guaranteed before external trimming and applies at

gains less than 50. This error increases at gains over 50.

Adjustable to zero.

STROBE pulse width must be less than EOC period to achieve maximum

throughput rate.

FUNCTIONAL SPECIFICATIONS (Continued)

PIN NO.

HDAS-16

HDAS-8

1

CH3 IN

CH3 HIGH IN

2

CH2 IN

CH2 HIGH IN

3

CH1 IN

CH1 HIGH IN

4

CH0 IN

CH0 HIGH IN

5

MUX ENABLE

*

6

RDELAY

*

7

EOC

*

8

STROBE

*

9

A8

MULTIPLEXER

*

10

A4

ADDRESS

*

11

A2

OUT

*

12

A1

*

13

RA8

MULTIPLEXER

*

14

RA4

ADDRESS

*

15

RA2

IN

*

16

RA1

*

17

DIGITAL COMMON

*

18

+5V SUPPLY

*

19

LOAD

*

20

CLEAR

*

21

ENABLE (Bits 9–12)

*

22

BIT 12 (LSB)

*

23

BIT 11

*

24

BIT 10

*

25

BIT 9

*

26

ENABLE (Bits 5–8)

*

27

BIT 8

*

28

BIT 7

*

29

BIT 6

*

30

BIT 5

*

31

ENABLE (Bits 1–4)

*

32

BIT 4

*

33

BIT 3

*

34

BIT 2

*

35

BIT 1 (MSB)

*

36

GAIN ADJUST

*

37

OFFSET ADJUST

*

38

BIPOLAR INPUT

*

39

SAMPLE/HOLD OUT

*

40

+10V REFERENCE OUT

*

41

ANALOG SIGNAL COMMON

*

42

ANALOG POWER COMMON

*

43

+15V SUPPLY

44

–15V SUPPLY

*

45

ANALOG SIGNAL COMMON

*

46

ANALOG SIGNAL COMMON

*

47

RGAIN LOW

*

48

RGAIN HIGH

*

49

AMP. IN HIGH

*

50

AMP. IN LOW

*

51

CH15 IN

CH7 LOW IN

52

CH14 IN

CH6 LOW IN

53

CH13 IN

CH5 LOW IN

54

CH12 IN

CH4 LOW IN

55

CH11 IN

CH3 LOW IN

56

CH10 IN

CH2 LOW IN

57

CH9 IN

CH1 LOW IN

58

CH8 IN

CH0 LOW IN

59

CH7 IN

CH7 HIGH IN

60

CH6 IN

CH6 HIGH IN

61

CH5 IN

CH5 HIGH IN

62

CH4 IN

CH4 HIGH IN

INPUT/OUTPUT CONNECTIONS

*Same as HDAS-16

Caution: Pins 49 and 50 do not have overvoltage protection; therefore, protected multiplexers,

such as MPS’s MX-1606 and MX-808 are recommended. See the General Operation description.

TECHNICAL NOTES

1. Input channels are protected to 20 Volts beyond the powersupplies.

All digital output pins have one second short-circuit protection.

2. To retain high system throughput rates while digitizing low-level signals,

apply external high-gain amplifiers foreach channel. MPS’s AM-551 is

suggested for such amplifier-per-channel applications.

3. The HDAS devices have self-starting circuits for free-running sequential

operation. If, however, in a power-upcondition the supply voltage slew rate

is less than 3V per microsecond, the free running state might not be initial-

ized. Apply a negative pulse to the STROBE, to eliminate this condition.

4. For unipolar operation, connect BIPOLAR INPUT (pin 38) to S/H OUT (pin 39).

For bipolar operation, connect BIPOLAR INPUT (pin 38) to +10V REFERENCE

OUT (pin 40).

5. RDELAY may be a standard value 5% carbon composition or film-type resistor.

6. RGAIN must be very accurate with low temperature coefficients. If neces-

sary, fabricate the gain resistor from a precision metal-film type in series

with a low value trim resistor or potentiometer. The total resistor tempera-

ture coefficient must be no greater than ±10ppm/°C.

7. ANALOG SIGNAL COMMON, POWER COMMON and DIGITAL COMMON are

connected internally. For optimal performance, tie all ground pins (17, 41,

42, 45, 46) directly to a large analog ground plane beneath the package.

8. For HDAS-16, tie pin 50 to a “signal source common” if possible. Otherwise

tie pin 50 to pin 41 (ANA SIG COM).