Digital Electronics: Principles, Devices and Applications

514 Digital ElectronicsR-NetworkTop(PMOSBody)15 1011ClockP-ResistorN-BodyV SS6450300256RNetworkAnalogSwitchesSelectionAndControlLogic98StartConversionEnd ofConversion(EOC)-V GG3001508-BitLatch7 TristateOutput18 EnableV DDDigitalGroundComparator5124 3 2 1 17 16 14 13R-NetworkBottomV inAnalogInputMSBComplementaryDigital OutputLSBFigure 12.41 Internal architecture of AD 0800.Figures 12.42(a) and (b) show application circuits using AD-0800. Figure 12.42(a) shows typicalcircuit connections for a ±5 V input voltage range and TTL-compatible output levels, whereasFig. 12.42(b) shows the connections for a 0–10 V input range and 0–10 V output levels.12.12.2 ADC-0808ADC 0808 is an eight-bit CMOS successive approximation type A/D converter. The device hasan eight-channel multiplexer and a microprocessor-compatible control logic. Salient features ofthe device include eight-bit resolution, no missing codes, a conversion time of 100 s (typical),