AD7819

a FEATURES 8-Bit ADC with 4.5 ␮ s Conversion Time On-Chip Track and Hold Operating Supply Range: +2.7 V to +5.5 V Specifications at +2.7 V – 3.6 V and 5 V ؎ 10% 8-Bit Parallel Interface 8-Bit Read Power Performance Normal Operation 10.5 mW, VDD = 3 V Automatic Power-Down 57.75 ␮W @ 1 kSPS, VDD = 3 V Analog Input Range: 0 V to V REF Reference Input Range: 1.2 V to VDD +2.7 V to +5.5 V, 200 kSPS 8-Bit Sampling ADC AD7819 FUNCTIONAL BLOCK DIAGRAM VDD AGND VREF AD7819 CHARGE REDISTRIBUTION DAC CLOCK OSC THREESTATE DRIVERS DB7 DB0 COMP VIN T/H CONTROL LOGIC BUSY CS RD CONVST GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7819 is a high speed, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 200 kSPS. The converter operates off a single +2.7 V to +5.5 V supply and contains a 4.5 µs successive approximation A/D converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. Using only address decoding logic the AD7819 is easily mapped into the microprocessor address space. When used in its power-down mode, the AD7819 automatically powers down at the end of a conversion and powers up at the start of a new conversion. This feature significantly reduces the power consumption of the part at lower throughput rates. The AD7819 can also operate in a high speed mode where the part is not powered down between conversions. In ...