AD7895AN-10

Overview

The AD7895AN-10 is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-pin plastic dual-in-line 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 bipolar input voltage range of ±10 V with a maximum conversion time of 3.8 μs in Mode 1 operation. Key electrical specifications include a signal-to-noise ratio of 70 dB, differential nonlinearity of ±1 LSB, and integral nonlinearity of ±1 LSB. Power consumption is limited to 20 mW maximum, with a typical dissipation of 16 mW.

Feature Summary

• Integrated signal scaling allows direct handling of ±10 V analog inputs while operating from a single +5 V supply.
• On-chip track/hold amplifier ensures accurate digitization of full-scale sine waves at high sampling rates.
• High-speed serial interface utilizes only two wires for data transmission, simplifying microcontroller integration.
• Automatic power-down mode significantly reduces current consumption during idle periods between conversions.

Applications

• Battery-powered portable instrumentation systems requiring low power consumption.
• Industrial process control loops utilizing standard ±10 V sensor signals.
• Data acquisition systems interfacing with microcontrollers or DSP processors via serial protocols.

Procurement Notes

Verify the specific suffix AN-10 corresponds to the Plastic DIP package and ±10 V input range when sourcing. Confirm that the required temperature range aligns with the specified -40 °C to +85 °C operational limits. Ensure external reference components meet the ±5% tolerance requirement for the +2.5 V REF IN pin to maintain specified accuracy levels.

Selection Notes

Select this component when a single-supply solution is required for bipolar ±10 V signals without external scaling circuitry. Consider the 3.8 μs conversion time and 192 kHz throughput rate against system latency requirements. Evaluate the serial interface compatibility with the host processor's available GPIO pins and clock speeds to ensure proper data retrieval timing.

Part Context

The AD7895 series includes variants with different input ranges and packages. The AD7895AN-10 specifically denotes the through-hole PDIP version designed for the widest analog input span. Other family members like the AD7895AR-10 offer surface mount options, while the AD7895-3 and AD7895-2 provide narrower voltage ranges for different application needs.

Replacement Considerations

The AD7894 is identified as a 14-bit pin-compatible upgrade within the same package footprint. Verify pinout compatibility if substituting with other SAR ADCs, as serial interface protocols may differ. Check thermal impedance ratings if replacing in dense PCB layouts, as the PDIP package has a thermal resistance of 130 °C/W.