AD7893BRZ-2

Overview

The AD7893BRZ-2 is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-pin SOIC package. 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 supports a unipolar input voltage range of 0 V to +2.5 V with straight binary output coding. Key electrical specifications include a maximum conversion time of 6 μs, a typical power dissipation of 25 mW, and a signal-to-noise ratio of 72 dB. Relative accuracy is specified at ±1/2 LSB, with differential nonlinearity and integral nonlinearity within ±1 LSB.

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 up to the Nyquist rate.
• Two-wire serial interface simplifies connection to microcontrollers and DSP processors by requiring only a clock and data line.

Applications

• Battery-powered portable instrumentation due to low power consumption and single-supply operation.
• Industrial process control systems requiring isolated or remote sensor signal acquisition.
• Data acquisition modules in embedded systems utilizing serial communication protocols.

Procurement Notes

Verify that the specific ordering suffix corresponds to the BRZ variant, which indicates the B-grade temperature range and RoHS-compliant plastic SOIC packaging. Confirm that the required input range matches the -2 designation (0 V to +2.5 V), as other suffixes handle different voltage spans. Ensure the design accommodates the external +2.5 V reference requirement, as the part does not contain an internal reference source.

Selection Notes

Select this component when a compact 8-pin solution is required for 12-bit resolution applications with moderate throughput needs around 117 kHz. Choose the BRZ-2 version specifically for unipolar signals within the 0 V to +2.5 V window. Consider alternative models if bipolar input ranges or higher sampling rates are necessary, as this device is optimized for low-power, space-constrained environments rather than high-speed multi-channel systems.

Part Context

The AD7893 series utilizes Analog Devices' LC2MOS process, combining precision bipolar circuits with low-power CMOS logic. This technology enables the integration of the ADC, track/hold, and serial interface into a minimal footprint. The BRZ-2 variant represents the commercial temperature grade (-40°C to +85°C) with enhanced linearity specifications compared to the standard A-grade parts, offering improved accuracy for precision measurement tasks.

Replacement Considerations

Public confirmed substitute part numbers: AD7893ARZ-2, AD7893AN-2, AD7893BN-2.