MDC_HDAS-524/528.B01 Page 3 of 5

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HDAS-524, HDAS-528

12-Bit, 400kHz

, Complete

Data Acquisition System

Notes:

1. For unipolar operation, connect pin 12 to pin 17.

2. For bipolar operation, connect pin 13 to pin 17.

Use RN55C, 1% resistors.

4. If gain and offset adjusts are not used, connect pin 15

to ground and leave pin 16 open.

Figure 2. Typical Connection Diagram

MUX ADDRESS PINS

39

38

37

CA2

CA1

CA0

CHANNEL

0

0

0

0

0

0

1

1

HDAS-524

0

1

0

2

(2-BIT ADDRESS)

0

1

1

3

1

0

0

4

1

0

1

5

HDAS-528

1

1

0

6

(3-BIT ADDRESS)

1

1

1

7

Table 1. MUX Channel Addressing

ZERO ADJUST

GAIN ADJUST

INPUT RANGE

+1/2LSB

+FS – 1 1/2LSB

0 to +10V

+1.22mV

+9.9963V

±10V

+2.44mV

+9.9927V

Table 3. Zero and Gain Adjust

INPUT RANGE

GAIN

THROUGHPUT

0 to +10V

1

OPEN

400kHz

0 to +5V

2

2k

325kHz

0 to +2.5V

4

665

275kHz

0 to +1.25V

8

287

225kHz

0 to +1V

10

221

175kHz

0 to +100mV

100

20

40kHz

±10V

1

OPEN

400kHz

±5V

2

2k

325kHz

±2.5V

4

665

275kHz

±1.25V

8

287

225kHz

±1V

10

221

175kHz

±100mV

100

20

40kHz

Table 2. Input Range Parameters

(GAIN –1)

2k

GAIN =

+1

2k

11

10

13

GAIN ADJUST

19

35

36

+5V

20

+15V

18

–15V

OFFSET ADJUST

R

GAIN

HI

RGAIN LO

19

15

16

–15V

–15V

+15V

+15V

20k

20k

+10V REF

4.7µF

0.1µF

R GAIN

4.7µF

0.1µF

4.7µF

0.1µF

4.7µF

0.1µF

+

+

+

+

DGND

AGND

The HDAS devices enter the hold mode and are ready for conversion upon

the start convert going high. The conversion is complete within a maximum of

800ns (+25°C). EOC returns low, the data is valid and sent to the three-state

output buffers. The sample/hold is now ready to acquire new data.

CALIBRATION PROCEDURE

1.

Connect the converter per Figure 2 and Tables 2 and 3 for the appropriate

input range. Apply a pulse of 100 nano-seconds (typical) to the START

CONVERT input (pin 40) at a rate of 100kHz. This rate is chosen to reduce

flicker if LED’s are used on the outputs for calibration purposes.

2.

Zero Adjustments

Apply a precision voltage reference source between the analog input and

SIGNAL GROUND (pin 14). Adjust the output of the reference source per

Table 3. For unipolar, adjust the zero trimming potentiometer so that the

output code flickers equally between 0000 0000 0000 and 0000 0000

0001 with the COMP BIN (pin 9) tied high (straight binary) or between

1111 1111 1111 and 1111 1111 1110 with the COMP BIN (pin 9) tied low

(complementary binary).

For bipolar operation, adjust the potentiometer such that the code flickers

equally between 1000 0000 0000 and 1000 0000 0001 with COMP BIN

(pin 9) tied high (offset binary) or between 0111 1111 1111 and 0111

1111 1110 with COMP BIN (pin 9) tied low (complementary offset binary).

3.

Full-Scale Adjustment

Set the output of the voltage reference used in step 2 to the value shown

in Table 3. Adjust the gain trimming potentiometer so that the output

code flickers equally between 1111 1111 1110 and 1111 1111 1111 or

0000 0000 0001 and 0000 0000 0000 for complementary coding.

4.

To confirm proper operation of the device, vary the precision reference

voltage source to obtain the output coding listed in Table 4.