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ADS119 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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4 / 8 page ® ® ADS-119 4 Figure 4. Typical Connection Diagram CALIBRATION PROCEDURE (Refer to Figures 3 and 4, Table 1) Any offset and/or gain calibration procedures should not be implemented until devices are fully warmed up. To avoid interaction, offset must be adjusted before gain. The ranges of adjustment for the circuits in Figure 3 and 4 are guaranteed to compensate for the ADS-119's initial accuracy errors and may not be able to compensate for additional system errors. A/D converters are calibrated by positioning their digital outputs exactly on the transition point between two adjacent digital output codes. This can be accomplished by connecting LED's to the digital outputs and adjusting until certain LED's "flicker" equally between on and off. Other approaches employ digital comparators or microcontrollers to detect when the outputs change from one code to the next. Offset adjusting for the ADS-119 is normally accomplished at the point where the MSB is a 1 and all other output bits are 0's and the LSB just changes from a 0 to a 1. This digital output transition ideally occurs when the applied analog input is +½ LSB (+366µV). Gain adjusting is accomplished when all bits are 1's and the LSB just changes from a 1 to a 0. This transition ideally occurs when the analog input is at +full scale minus 1 ½ LSB's (+1.4989V). Zero/Offset Adjust Procedure 1. Apply a train of pulses to the START CONVERT input (pin 16) so the converter is continuously converting. 2. Apply +366µV to the ANALOG INPUT (pin 19). 3. Adjust the offset potentiometer until the output bits are 1000 0000 0000 and the LSB flickers between 0 and 1. Gain Adjust Procedure 1. Apply +1.4989V to the ANALOG INPUT (pin 19). 2. Adjust the gain potentiometer until all output bits are 1's and the LSB flickers between 1 and 0. 3. To confirm proper operation of the device, vary the input signal to obtain the output coding listed in Table 1. +FS–1 LSB +1.49927V 1111 1111 1111 +3/4 FS +1.12500V 1110 0000 0000 +1/2 FS +0.75000V 1100 0000 0000 0 0.00000V 1000 0000 0000 –1/2 FS –0.75000V 0100 0000 0000 –3/4 FS –1.12500V 0010 0000 0000 –FS +1 LSB –1.49927V 0000 0000 0001 –FS –1.50000V 0000 0000 0000 BIPOLAR ADS-119 OUTPUT CODING SCALE INPUT VOLTAGE OFFSET BINARY (±1.5V RANGE) MSB LSB Table 1. Output Coding for Bipolar Operation To Pin 19 of ADS-119 –15V SIGNAL INPUT GAIN ADJUST 1.98k Ω 50 Ω +15V 2k Ω Figure 3. Optional Calibration Circuit, ADS-119 0.1µF 0.1µF 4.7µF 4.7µF 13, 20 20 18, 20 ADS-119 –5V 20k Ω +5V 14 –5V +5V 19 17 16 12 11 10 9 8 7 6 5 4 3 2 1 15 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) DATA VALID ANALOG INPUT START CONVERT A single +5V supply should be used for both the +5V analog and +5V digital. If separate supplies are used, the difference between the two cannot exceed 100mV. OFFSET ADJUST |
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