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ADS-112MC Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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ADS-112MC Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 6 page  ® ® ADS-112 4 CALIBRATION PROCEDURE 1. Connect the converter per Figures 3 and 4 and Tables 1 and 3 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 the 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 COMP BIN (pin 18) tied high (straight binary) or between 1111 1111 1111 and 1111 1111 1110 with pin 18 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 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 2. 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. To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding listed in Table 4. Figure 3. Typical ADS-112 Connection Diagram Table 1. Input Range Selection INPUT RANGE INPUT PIN TIE TOGETHER ±5v Pin 19 Pin 20 to Pin 21 0 to +10V Pin 19 Pin 20 to Ground Table 3. Input Range (using external calibration) INPUT RANGE R1 R2 UNIT 0 to 10V, ±5 2 2 k Ω 0 to 5V, ±2.5V 2 6 k Ω 0 to +2.5V, ±1.25V 2 14 k Ω To Pin19 of ADS-112 –15V +15V For values of R1 and R2 refer to Table 3. R2 R1 5k Ω 50 Ω 10k Ω ZERO/ OFFSET ADJUST SIGNAL INPUT GAIN ADJUST 5k Ω Figure 4. Optional Calibration Circuit Table 2. Zero and Gain Adjust 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 0.1µF 4.7µF 13 14 ADS-112 19 16 12 11 10 9 8 7 6 5 4 3 2 1 15 17 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 23 22 0.1µF 4.7µF 24 20 COMP BIN 0.1µF + 4.7µF 21 +10V REF. UNIPOLAR OPERATION BIPOLAR OPERATION 20 21 18 +5V Note: Always bypass pin 21 to ground |
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