AD7892ANZ-3

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Analog to Digital Converters (ADC) are key components used to allow digital processing of analog signals. The AD7892ANZ-3 is an integrated circuit (IC) containing an 8-bit A/D converter, track-and-hold circuitry, and reference from Analog Devices. The AD7892ANZ-3 is a low power, 8-bit sampling, analog-to-digital data acquisition system designed to operate in a variety of single-supply and battery-operated analog sensing applications.

Features

• Low-Power (<3 mA @ 3V supply, 20 mA @ 5V supply) A/D Converter
• Command Mode for Automatic Conversion
• 8-bit Monotonically Increasing Digital Output Code
• No Missing Codes
• On-Chip Track-and-Hold Circuit
• Differential or Single-Ended Inputs
• Selectable Input Range of ±2.5V, ±5V, or +2.5V to +5V
• ±1.5 LSB Integral Nonlinearity Error (INL)
• 3V to 5.5V Single Supply Operation
• On-Chip Reference Input
• Microprocessor-Compatible Serial Data Output

Application Field

The AD7892ANZ-3 is ideally suited for applications such as battery-operated data loggers, portable instrumentation systems, 4-20mA transmitters and receivers, and portable industrial controllers. The track-and-hold circuitry is useful for processing slowly changing analog signals from a variety of sources and the on-chip reference makes the part easily configurable for a broad range of input signal ranges.

Working Principle

The AD7892ANZ-3 consists of a differential/single ended 8-bit ADC, track-and-hold circuitry and a 2.5V precision voltage reference. The IC integrates an 8-bit CMOS ADC and a track-and-hold amplifier (THA) on the same die, and features differential/single ended selection and three different input ranges (2.5 V, 5 V and 2.5 to 5 V). The signal to be converted is applied to the differential input pins of the IC, while the track-and-hold amplifier (THA) extracts the signal sample. The signal sample is stored by the track-and-hold stage and, when required, is converted by the on-chip ADC. The result is presented as a digital code on a serial interface. The AD7892ANZ-3 also has an on-chip reference, which allows operation from a single power supply (2.7 to 5.5V).

Conclusion

The AD7892ANZ-3 is an 8-bit A/D converter which is ideal for portable, battery-operated applications. It has a variety of features, such as differential/single ended inputs and selectable input ranges, which make it highly configurable for different signal sources and input ranges. The integrated track-and-hold circuitry, and the on-chip reference make the part easy to set up and use. These features make the AD7892ANZ-3 an excellent choice for applications requiring low power A/D conversion.

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