AD7895ARZ-2

Overview

The AD7895ARZ-2 is a 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. 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 unipolar analog input range of 0 V to +2.5 V and utilizes straight binary output coding. Key electrical specifications include a maximum conversion time of 3.8 μs in Mode 1 operation, a signal-to-noise ratio of 70 dB, and a maximum power dissipation of 20 mW. It is housed in an 8-pin SOIC package with a specified operating temperature range of -40 °C to +85 °C.

Feature Summary

• Integrated on-chip track/hold amplifier for accurate signal acquisition
• High-speed two-wire serial interface for data retrieval
• Automatic power-down mode for low-power applications
• Single +5 V supply operation capability

Applications

• Battery-powered or portable electronic systems
• Industrial process control monitoring
• Data acquisition systems requiring serial connectivity

Procurement Notes

Verify the specific suffix '2' to confirm the 0 V to +2.5 V unipolar input range, as other variants like AD7895-10 or AD7895-3 support different voltage ranges. Ensure the external reference voltage connected to the REF IN pin is within the specified 2.375 V to 2.625 V limits to maintain accuracy. Confirm that the application circuitry respects the absolute maximum ratings for analog inputs to prevent device damage.

Selection Notes

Select this component when a compact 8-pin solution is required for 12-bit resolution tasks. The AD7895ARZ-2 is suitable for designs needing a unipolar 0 V to +2.5 V input range. Consider the 3.8 μs conversion time and 192 kHz throughput rate against system timing requirements. Verify compatibility with the host microcontroller's serial clock frequency, which must not exceed 15 MHz.

Part Context

The AD7895ARZ-2 belongs to the AD7895 family of fast 12-bit ADCs. This series includes variants with different input ranges, such as the AD7895-10 for ±10 V and AD7895-3 for ±2.5 V bipolar inputs. All variants share the same 8-pin mini-DIP and SOIC packages and similar performance characteristics regarding conversion speed and power consumption.

Replacement Considerations

The datasheet identifies the AD7894 as a 14-bit pin-compatible upgrade option. Designers requiring higher resolution may consider the AD7894 series, which maintains the same package footprint and interface logic while offering increased bit depth.