ADI AD7582BQ

The AD7582 is a medium speed, 4-channel 12-bit CMOS A/D converter which uses the successive approximation technique to provide a conversion time of 100μs per channel. An auto-zero cycle occurs at the start of each conversion resulting in very low system offset voltages, typically less than 100μV. The device is designed for easy microprocessor interface using standard control signals; CS (decoded device address), RD (READ) and WR (WRITE). The 4-channel input multiplexer is controlled via address inputs A0 and A1. Conversion results are available in two bytes, 8LSB's and 4MSB's, over an 8-bit three state output bus. Either byte can be read first. Two converter busy flags are available to facilitate polling of the converter's status. The analog input voltage range is 0V to +5V when using a reference voltage of +5V. The four analog inputs are all high impedance inputs with tight channel-to-channel matching -- typically 0.1LSBs.

• 12-Bit Successive Approximation ADC
• Four High Impedance Input Channels
• Analog Input Voltage Range of 0 to +5V with Positive Reference of ±5V
• Conversion Time of 100μs per Channel
• No Missed Codes Over Full Temperature Range
• Low Total Unadjusted Error ± 1LSB max
• Autozero Cycle for Low Offset Voltage
• Monolithic Construction