AD7899SRZ-1

Overview

The AD7899SRZ-1 is a 14-bit successive-approximation analog-to-digital converter (ADC) from Analog Devices, designed for high-speed data acquisition. It operates on a single 5 V supply and achieves a maximum throughput rate of 400 kSPS with a conversion time of 2.2 µs. The device features an internal 2.5 V reference, on-chip clock oscillator, and signal conditioning circuitry. It accepts bipolar input ranges of ±5 V or ±10 V. The part utilizes a high-speed parallel interface compatible with both 3 V and 5 V logic levels via the VDRIVE pin. It is housed in a 28-lead SOIC package and supports an extended operating temperature range from -55°C to +125°C.

Feature Summary

• Integrated track/hold amplifier with fast acquisition time for accurate sampling at high speeds.
• High-speed parallel data bus allows direct interfacing with 3 V or 5 V microprocessors and DSPs.
• Built-in overvoltage protection on analog inputs prevents damage during voltage excursions.
• Configurable power-saving standby mode reduces current consumption significantly.

Applications

• Industrial process control systems requiring precise signal digitization.
• Portable instrumentation benefiting from low power consumption and single-supply operation.
• Data acquisition modules interfacing with digital signal processors.
• Medical equipment requiring isolated or protected analog front ends.

Procurement Notes

Verify the specific suffix 'SRZ-1' against the manufacturer's current ordering guide to confirm the military-grade temperature range (-55°C to +125°C) and RoHS compliance status. Ensure the design accommodates the 28-lead SOIC package dimensions and thermal requirements. Cross-reference the datasheet revision to confirm pinout compatibility if replacing older versions.

Selection Notes

Select this component when a 14-bit resolution and 400 kSPS throughput are required within a single-supply architecture. The AD7899SRZ-1 is suitable for applications needing bipolar input ranges of ±5 V or ±10 V without external scaling amplifiers. Consider the parallel interface complexity versus serial alternatives like the AD7894 if pin count is constrained. Verify that the system can support the 80 mW typical power dissipation.

Part Context

The AD7899 series includes variants with different input ranges and accuracy grades. The '-1' suffix denotes the version supporting ±5 V and ±10 V bipolar input ranges. The 'S' indicates the military temperature grade (-55°C to +125°C), while 'AR' typically denotes commercial grade. The 'Z' suffix generally signifies lead-free/RoHS compliance. This specific model combines the high-temperature rating with the standard industrial input ranges.

Replacement Considerations

The AD7899ARZ-1 is a pin-compatible alternative but operates in the commercial temperature range (-40°C to +85°C). For higher speed or lower power needs, consider the AD768x series, though these may require interface changes. Serial ADCs like the AD7894 offer fewer pins but lower throughput.