Catalog
CMOS 12-Bit Successive Approximation ADC
Key Features
• 12-Bit Successive Approximation ADC
• No Missed Codes Over Full Temperature Range
• Low Total Unadjusted Error ±1LSB max
• High Impedance Analog Input
• Autozero Cycle for Low Offset Voltage
• Low Power, 75mW typ
• Small Size: 0.3", 24-Pin Package
• Conversion Time of 100µs
Description
AI
The AD7578 is a medium speed, monolithic 12-bit CMOS A/D converter which uses the successive approximation technique to provide a conversion time of 100µs. 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 interfacing using standard control signals;CS(decoded device address),RD(READ)andWR(WRITE).Conversion results are available in two bytes, 8LSBs and 4MSBs, 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.PRODUCT HIGHLIGHTSThe AD7578 is a complete 12-bit A/D converter in a 24-pinpackage requiring only a few passive components and a voltge referenceAutozero cycle realizes very low offset voltages, typically 100µVStandard microprocessor control signals to allow easy interfacingto most popular 8- and 16-bit processors.Monolithic construction for increased reliability and small 0.3", 24-pin package.
