AD7893BR-10

Overview

The AD7893BR-10 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 features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. The device accepts a bipolar analog input range of ±10 V with a maximum conversion time of 6 μs and a throughput rate up to 117 kHz. Key electrical specifications include a typical power dissipation of 25 mW, a signal-to-noise ratio of 72 dB, and relative accuracy of ±1/2 LSB. It is housed in an 8-pin SOIC package and supports an operating temperature range of –40 °C to +85 °C.

Feature Summary

• Integrates a fast 12-bit ADC, track/hold amplifier, and control logic within a compact 8-pin package for space-efficient designs.
• Operates from a single +5 V supply with low power consumption, making it suitable for battery-powered applications.
• Features a simple two-wire serial interface utilizing SCLK and SDATA lines for easy microcontroller integration.

Applications

• Battery-powered portable instrumentation
• Industrial data acquisition systems
• Process control monitoring

Procurement Notes

Verify the specific suffix BR-10 against the manufacturer's current ordering guide to confirm package type and temperature grade. Ensure the external reference voltage matches the required +2.5 V specification for optimal performance. Check for RoHS compliance status if environmental regulations apply to the target assembly.

Selection Notes

Select this component when a single-channel, 12-bit resolution is required with a ±10 V input range. Compare the 72 dB SNR and ±1/2 LSB linearity against system noise floors. Consider the 8-pin SOIC footprint constraints and verify that the serial interface timing meets the host processor's speed requirements.

Part Context

The AD7893 series includes variants with different input ranges: AD7893-2 (0 V to +2.5 V), AD7893-3 (±2.5 V), AD7893-5 (0 V to +5 V), and AD7893-10 (±10 V). The BR suffix indicates a B-grade version with improved linearity compared to the A-grade AN/AR versions. All variants share the same pinout and core architecture.

Replacement Considerations

Direct replacements within the AD7893 family include AD7893AN-10 or AD7893AR-10 for similar functionality with potentially different linearity grades. Cross-family replacements require verifying pin compatibility and serial interface protocols.

FAQ

What is the output coding format for the AD7893-10?

The AD7893-10 uses two's complement binary output coding.

How is the conversion initiated on the AD7893?

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

What is the minimum acquisition time required before the next conversion?

To achieve optimum performance, a minimum of 600 ns should be allowed after the read operation ends before initiating the next conversion.