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AD7821 Datasheet(PDF) 11 Page - Analog Devices |
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AD7821 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD7821 REV. A –11– APPLYING THE AD7821 The AD7821 is specified for a unipolar input range of 0 to +5 V and a bipolar input range of –2.5 V to +2.5 V. The VREF(–) and VREF(+) voltages required for these input ranges are outlined be- low. See the Typical Performance Characteristics section for op- eration with unspecified input voltage ranges. UNIPOLAR OPERATION Figure 18 gives the configuration and reference voltages re- quired for 0 V to +5 V operation. The nominal transfer charac- teristic for this input range is shown in Figure 19. The output code is Natural Binary with 1 LSB = (5/256) V = 19.5 mV. Figure 18. AD7821 Unipolar/Bipolar Operation Figure 19. Nominal Transfer Characteristic for Unipolar (0 V to +5 V) Operation BIPOLAR OPERATION Figure 18 gives the configuration and reference voltages required for –2.5 V to +2.5 V operation. The nominal transfer characteristic for this input range is shown in Figure 20. The output code is Offset Binary with 1 LSB = ([+2.5 – (–2.5)]/256) V = 19.5 mV. Figure 20. Nominal Transfer Characteristic for Bipolar (–2.5 V to +2.5 V) Operation 16-CHANNEL TELECOM A/D CONVERTER The fast sampling rate (1 MHz) and bipolar operation of the AD7821 makes it useful in Telecom applications for sampling a number of input channels using a multiplexer. Figure 21 shows a circuit for such an application. The maximum signal frequency required for acceptable quality in Telecom applications is 3 kHz. The circuit given in Figure 21 permits each of the 16-input channels to be sampled at a rate of 16 kHz maximum. The sampling rate takes account of such multiplexer parameters as tON, settling time etc. The circuit also eases the problem of the antialiasing filter design by sampling at a rate much greater than that required by the Nyquist criterion. Figure 21. 16-Channel Telecom A/D Converter System |
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