AD7893BR-2

Overview

The AD7893BR-2 is a 12-bit successive approximation analog-to-digital converter (ADC) fabricated in LC2MOS technology. It operates from a single +5 V supply and consumes 25 mW typical power. The device features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. It accepts a unipolar analog input range of 0 V to +2.5 V with a maximum conversion time of 6 μs and a throughput rate up to 117 kHz. The part is housed in an 8-pin SOIC package and provides a signal-to-noise ratio of 72 dB.

Feature Summary

• Integrated signal scaling for direct handling of 0 V to +2.5 V analog inputs without external attenuation circuitry
• On-chip track/hold amplifier ensures accurate digitization of full-scale sine waves at maximum sampling rates
• Two-wire serial interface simplifies connection to microcontrollers and DSP processors

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Medical equipment signal conditioning

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature range. Ensure the reference voltage source meets the specified current and accuracy requirements for optimal performance.

Selection Notes

Select this component when a compact 8-pin solution is required for low-power 12-bit conversion. Confirm that the system timing allows for the necessary 600 ns acquisition window between conversions to maintain specified linearity and noise performance.

Part Context

This model belongs to the AD7893 family of fast 12-bit ADCs. Variants within the series differ primarily by analog input voltage ranges and packaging options. The BR-2 designation indicates a commercial temperature range and specific linearity error specifications compared to other family members.

Replacement Considerations

Direct pin-compatible replacements are not explicitly documented in the provided datasheet. Evaluate alternative Analog Devices SAR ADCs with similar serial interfaces and input ranges if sourcing constraints exist.

FAQ

What is the output coding format for the AD7893BR-2?

The AD7893BR-2 uses straight (natural) binary output coding.

How is the conversion cycle initiated?

Conversion is initiated on the rising edge of the CONVST input signal.

What is the minimum recommended interval before starting the next conversion?

A minimum of 600 ns should be allowed after the read operation ends before initiating the next conversion to optimize track/hold settling.