ADS-117MC datasheet(4/6 Pages) ETC

4 / 6 page

®®

ADS-117

CALIBRATION PROCEDURE

1. Connect the converter per Figure 3, Figure 4, and Table 1

for the appropriate input range. Apply a pulse of 150

nanoseconds to the START CONVERT input (pin 16) at a

rate of 250kHz. 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

amplifier’s analog input and ground. Adjust the output of the

reference source per Table 2. For unipolar, adjust the zero

trimming potentiometer so that the output code flickers

equally between 0000 0000 0000 and 0000 0000 0001 with

the pin 18 tied high (straight binary) or between 1111 1111

1111 and 1111 1111 1110 with the pin 18 tied low (comple-

mentary binary).

For bipolar operation, adjust the potentiometer such that

the code flickers equally between 1000 0000 0000 and

1000 0000 0001 with pin 18 tied high (offset binary) or

between 0111 1111 1111 and 0111 1111 1110 with pin 18

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 1. Adjust the gain trimming potentiom-

eter so that the output code flickers equally between 1111

1111 1110 and 1111 1111 1111 for pin 18 tied high or

between 0000 0000 0001 and 0000 0000 0000 for pin 18

tied low.

4. To confirm proper operation of the device, vary the preci-

sion reference voltage source to obtain the output coding

listed in Table 3.

To Pin19

of ADS-117

–15V

+15V

For values of R1 and R2 refer to Table 1.

Ω

10k

Ω

ZERO/

OFFSET

ADJUST

SIGNAL

INPUT

GAIN

ADJUST

Ω

➀

Figure 3. ADS-117 Connection Diagram

Table 1. Input Connections (using external calibration)

INPUT RANGE

UNIT

0 +10V, ±5

Ω

0 to 5V, ±2.5V

Ω

0 to +2.5V, ±1.25V

Ω

Table 2. Zero and Gain Adjustments

Input

Zero Adjust

Gain Adjust

Range

+1/2 LSB

+FS – 1 1/2 LSB

0 to +10V

+1.22mV

+9.9963V

±5V

+1.22mV

+4.9963V

Figure 4. Optional Calibration Circuit

0.1µF

4.7µF

ADS-117

BIT 1 (MSB)

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12 (LSB)

EOC

ENABLE (1-12)

ANALOG INPUT

START CONVERT

+5V

–15V

+15V

0.1µF

4.7µF

0.1µF

4.7µF

COMP BIN

0.1µF

4.7µF

21 +10V REF.

UNIPOLAR

OPERATION

+5V

NOTE:

BIPOLAR INPUT

For unipolar operation, ground pin 20.

For bipolar operation, connect pin 20 to pin 21.

Always bypass pin 21 as shown for both unipolar

and bipolar operation.

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