User Manual

Applications Information (Continued)

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FIGURE 4. Better defining the ADC Reference Voltage. Self-bias is still used, but the reference voltages are trimmed

by providing a small trim current with the operational amplifiers.

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FIGURE 5. Driving the reference to force desired values requires driving with a low impedance source, provided by

the transistors. Note that pins 16 and 22 are not connected.

ADC1173