AD7893BRZ-2REEL

Overview

The AD7893BRZ-2REEL is a 12-bit successive approximation analog-to-digital converter (ADC) fabricated in LC2MOS technology. It operates from a single +5 V supply and features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. The BRZ-2 variant supports a unipolar input voltage range of 0 V to +2.5 V with straight binary output coding. Key electrical parameters include a maximum conversion time of 6 μs, a typical power dissipation of 25 mW, and a signal-to-noise ratio of 72 dB. The device is housed in an 8-pin SOIC package and functions within a temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates a 12-bit ADC, track/hold amplifier, and control logic into 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 two-wire high-speed serial interface utilizing SCLK and SDATA lines for simplified microcontroller connectivity.

Applications

• Battery-powered portable instrumentation
• Industrial process control systems
• Data acquisition modules

Procurement Notes

Verify the specific suffix 'REEL' indicates tape-and-reel packaging when sourcing components. Confirm that the 'B' grade designation corresponds to the required linearity accuracy and SNR specifications for your application. Ensure the ordering part number matches the exact pinout and thermal characteristics defined in the official Analog Devices documentation.

Selection Notes

Select the AD7893BRZ-2REEL when a 0 V to +2.5 V unipolar input range is required. Choose this model over other variants if the system demands a 72 dB SNR and ±1/2 LSB relative accuracy. Verify compatibility with single-supply +5 V operation and ensure the host processor can support the required serial clock timing for data retrieval.

Part Context

This component belongs to the AD7893 family of fast 12-bit ADCs. The 'B' suffix denotes a specific performance grade with tighter linearity and noise specifications compared to the 'A' version. The 'Z' indicates RoHS compliance, while 'REEL' specifies the bulk packaging format. This part is designed for applications requiring moderate speed and high accuracy in a minimal footprint.

Replacement Considerations

The AD7893ARZ-2REEL serves as a functional substitute with identical pinouts but lower SNR and linearity specifications. Other members of the AD7893 family may be considered if different input ranges or package types are acceptable.

FAQ

What is the output coding format for the AD7893BRZ-2?

The AD7893BRZ-2 uses straight (natural) binary output coding because it is a unipolar device.

How is the conversion cycle initiated?

Conversion is initiated by applying a rising edge pulse to the CONVST (Convert Start) input pin.

What is the minimum throughput rate for optimum performance?

Optimum performance requires a minimum throughput time of 8.52 μs, which allows for conversion, readout, and track/hold acquisition.