描述 Description

The ADC0808, ADC0809 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses successive approximation as the conversion technique. The converter features a high impedance chopper stabilized comparator, a 256R voltage divider with analog switch tree and a successive approximation register. The 8-channel multiplexer can directly access any of 8-single-ended analog signals.The device eliminates the need for external zero and full-scale adjustments. Easy interfacing to microprocessors is provided by the latched and decoded multiplexer address inputs and latched TTL TRI-STATE outputs.The design of the ADC0808, ADC0809 has been optimized by incorporating the most desirable aspects of several A/D conversion techniques. The ADC0808, ADC0809 offers high speed, high accuracy, minimal temperature dependence, excellent long-term accuracy and repeatability, and consumes minimal power. These features make this device ideally suited to applications from process and machine control to consumer and automotive applications. For 16-channel multiplexer with common output (sample/hold port) see ADC0816 data sheet. (See AN-247 (Literature Number SNOA595) for more information.)

特性 Features

? Easy Interface to All Microprocessors
? Operates Ratiometrically or with 5 VDC or Analog Span Adjusted Voltage Reference
? No Zero or Full-Scale Adjust Required
? 8-Channel Multiplexer with Address Logic
? 0V to VCC Input Range
? Outputs meet TTL Voltage Level Specifications
? ADC0808 Equivalent to MM74C949
? ADC0809 Equivalent to MM74C949-1
Key Specifications
? Resolution: 8 Bits
? Total Unadjusted Error: ±? LSB and ±1 LSB
? Single Supply: 5 VDC
? Low Power: 15 mW
? Conversion Time: 100 μs