AD7898AR-10

Overview

The AD7898AR-10 is a fast 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-lead SOIC package. It operates from a single 5 V supply and achieves a throughput rate of up to 220 kSPS. The device features an on-chip track/hold amplifier, an internal clock oscillator, and a high-speed serial interface compatible with 3 V processors via the VDRIVE pin. Designed for bipolar input signals, the AD7898-10 variant supports an input voltage range of ±10 V. Key performance specifications include a minimum Signal to (Noise + Distortion) Ratio of 71 dB, a maximum power dissipation of 22.5 mW, and integral linearity error of ±1 LSB.

Feature Summary

• Single 5 V supply operation with low power consumption suitable for battery-powered applications
• Flexible serial interface allowing direct connection to 3 V or 5 V processor systems
• On-chip signal scaling and track/hold amplifier for handling wide input ranges
• Proprietary power-down mode for extended standby current reduction

Applications

• Portable data acquisition systems requiring space-saving solutions
• Industrial process control monitoring
• Battery-operated instrumentation
• Subsampling applications utilizing high full-power bandwidth

Procurement Notes

Verify the specific ordering suffix to confirm package type and lead-free status. The 'Z' suffix indicates a Pb-Free component compliant with RoHS standards. Ensure the required temperature range matches the 'A' version specification of -40°C to +85°C. Confirm availability of evaluation boards if system integration testing is planned prior to production deployment.

Selection Notes

Select the AD7898AR-10 when a ±10 V input range is required; use the AD7898AR-3 for ±2.5 V inputs. Consider Mode 1 operation if external clock synchronization or power-down capabilities are necessary. Verify that the source impedance remains within limits to maintain Total Harmonic Distortion specifications. Ensure the reference voltage is stable at 2.5 V ± 5% for optimal accuracy.

Part Context

The AD7898 series integrates a 12-bit ADC, track/hold, and serial interface logic into a compact 8-lead package. This design reduces board space compared to discrete solutions. The family includes variants with different input ranges and packaging options, such as tape-and-reel configurations for automated assembly. All versions share the same core architecture and electrical characteristics.

Replacement Considerations

Direct functional substitutes within the same package and specification profile are not explicitly listed in the provided documentation. Cross-reference with other Analog Devices 12-bit SAR ADCs if pin compatibility is not required. Verify that replacement parts support the required ±10 V input range and 220 kSPS throughput.