AD7892ANZ-1

Overview

The AD7892ANZ-1 is a 12-bit successive approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a single +5 V supply and achieves a throughput rate of 500 kSPS with a conversion time of 1.6 µs. The device features an on-chip track/hold amplifier, an internal +2.5 V reference, and signal scaling for ±5 V or ±10 V input ranges. It supports both parallel and serial interfaces via a MODE pin. The component is housed in a 24-lead plastic DIP package and functions within a temperature range of -40 °C to +85 °C.

Feature Summary

• Integrated signal scaling allows direct handling of ±5 V or ±10 V analog inputs while operating from a single +5 V supply.
• Versatile interface logic enables flexible connection to microprocessors through selectable parallel or serial modes.
• On-chip track/hold amplifier ensures accurate acquisition of full-scale sine waves up to the Nyquist rate.

Applications

• Industrial process control systems requiring high-speed data acquisition
• Portable instrumentation powered by single-supply batteries
• Digital signal processing front-ends

Procurement Notes

Verify the specific suffix 'ANZ-1' against the manufacturer's current ordering guide to confirm package type and accuracy grade. Ensure the application requires the specified ±5 V or ±10 V input range compatible with this version. Confirm that the 24-lead PDIP package aligns with the PCB footprint design before finalizing procurement.

Selection Notes

Select this model when a 500 kSPS sampling rate and 12-bit resolution are sufficient for the application. It is suitable for designs requiring bipolar input ranges of ±5 V or ±10 V without external scaling circuitry. Consider alternative versions if higher throughput rates or different input voltage ranges are required.

Part Context

The AD7892 belongs to a family of high-speed, low-power ADCs designed for single-supply operation. Variants within the series differ primarily in input voltage ranges and maximum throughput speeds. This specific part represents the standard accuracy version optimized for general-purpose applications.

Replacement Considerations

Direct replacements include other AD7892 variants such as AD7892BN-1 for improved accuracy or AD7892AR-1 for surface mount packaging. Verify pin compatibility and electrical specifications before substituting.

FAQ

How is the analog input range configured for the AD7892-1?

The input range is determined by the connection of the VIN2 pin. Connecting VIN2 to AGND sets the range to ±10 V, while connecting VIN2 to VIN1 sets it to ±5 V.

What is the function of the MODE pin?

The MODE pin selects the data output interface. A logic high selects the parallel interface mode, while a logic low selects the serial interface mode.

Can the internal reference be used externally?

Yes, the internal +2.5 V reference is available at the REF OUT/REF IN pin. However, it should be buffered externally if driving loads beyond the chip's internal buffer capability due to its nominal 5.5 kΩ output impedance.