AD7813 Datasheet | Analog Devices

FEATURES 8-/10-Bit ADC with 2.3 ␮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 + 2-Bit Read Power Performance Normal Operation 10.5 m W, VDD = 3 V Automatic Power-Down 34.6 ␮ W @ 1 k SPS, 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, 400 k SPS 8-/10-Bit Sampling ADC AD7813 FUNCTIONAL BLOCK DIAGRAM VDD AGND VREF CHARGE REDISTRIBUTION DAC CLOCK OSC THREESTATE DRIVERS DB7 DB0 T/H CONTROL LOGIC BUSY CS RD CONVST GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7813 is a high-speed, microprocessor-patible, 8-/10-bit analog-to-digital converter with a maximum throughput of 400 k SPS. The converter operates off a single +2.7 V to +5.5 V supply and contains a 2.3 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. The 10-bit conversion result is read by carrying out two 8-bit read operations. The first read operation accesses the 8 MSBs of the ADC conversion result and the second read accesses the 2 LSBs. Using only address decoding logic the AD7813 is easily mapped into the microprocessor address space. When used in its power-down mode, the AD7813 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 AD7813 can also operate in a high speed mode where the part is not powered down between conversions. In this mode of operation the part is capable of providing 400 k SPS throughput. The part is available in a small, 16-lead, 0.3" wide, plastic dualin-line package (DIP), in a 16-lead, 0.15" wide, narrow body small outline IC (SOIC) and in a 16-lead thin shrink small outline package (TSSOP). 1....