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ADC76A Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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ADC76A Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 8 page ® ADC76 8 FIGURE 10. Two Methods of Connecting Optional Offset Adjust. FIGURE 11. Connecting Optional Gain Adjust. Adjust the Offset potentiometer until the actual end point transition voltage occurs at E IN Off. The ideal transition voltage values of the input are given in Table I. Gain—Connect the Gain adjust potentiometer as shown in Figure 11. Sweep the input through the end point transition voltage; that should cause an output transition to all bits on E IN On. Adjust the Gain potentiometer until the actual end point transition voltage occurs at E IN On. Table I details the transition voltage levels required. CONVERT COMMAND CONSIDERATIONS Convert command resets the converter whenever taken high. This insures a valid conversion on the first conversion after power-up. Convert command must stay low during a conversion unless it is desired to reset the converter during a conversion. OPTIONAL CONVERSION TIME ADJUSTMENT The ADC76 may be operated with faster conversion times for resolutions less than 14 bits by connecting the Short Cycle (pin 32) as shown in Table III. Typical conversion times for the resolution and connections are indicated. Resolution (Bits) 16 15 14 13 12 Connect Pin 32 to Open Pin 16 Pin 15 Pin 14 Pin 13 Typical Conversion Time 17 µs16µs15µs13µs12µs TABLE III. Short Cycle Connections for 12- to 16-Bit Resolutions. Clock Rate Control may be connected to an external multi- turn trim potentiometer with a TCR of ±10ppm/°C or less as shown in Figure 12. The typical conversion time versus the Clock Rate Control voltage is shown in Figure 13. The effect of varying the conversion time and the resolution on Linear- ity Error and Differential Linearity Error is shown in Figure 6. FIGURE 12. Clock Rate Control, Optional Fine Adjust. Control Voltage on Pin 23 (V) 0 2 4 6 8 20 15 10 Typical 14-Bit Operation 16-Bit Operation FIGURE 13. Conversion Time vs Clock Rate Control Voltage. 180k Ω +15VDC –15VDC 10k to 100k Offset Adjust Ω Ω 22k Ω (b) 1.8M Ω 27 +15VDC –15VDC 10k to 100k Offset Adjust Ω Ω (a) Comparator In 27 Comparator In 180k Ω R1 R1 270k Ω 22 +15VDC –15VDC 10k to 100k Gain Adjust Ω Ω Gain Adjust 0.01µF 29 Analog Common Clock Rate Control +15VDC 5k Ω Internal Clock Frequency Adjust 23 |
Similar Part No. - ADC76A |
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Similar Description - ADC76A |
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