AD7871JP

Overview

The AD7871JP is a complete monolithic 14-bit analog-to-digital converter fabricated in LC2MOS technology. It integrates a track-and-hold amplifier, successive approximation ADC, and a 3 V buried Zener reference. The device operates from ±5 V supplies with a typical power dissipation of 50 mW. It supports an input voltage range of ±3 V and achieves a throughput rate of 83 kSPS. Key dynamic specifications include an 80 dB signal-to-noise ratio at a 10 kHz input frequency and a total harmonic distortion of -86 dB max. The part features a 57 ns data access time and utilizes two's complement coding for digital output.

Feature Summary

• Integrates a laser-trimmed internal clock oscillator, eliminating the need for external timing components.
• Provides versatile interface logic supporting parallel, byte, and serial data output formats.
• Includes a factory-trimmed 3 V buried Zener reference with decoupling point for noise minimization.
• Features a high-speed track-and-hold amplifier capable of acquiring signals to 14-bit accuracy within 2 μs.

Applications

• Digital signal processing systems
• High speed modem implementations
• Speech recognition and synthesis hardware
• Spectrum analysis equipment
• DSP servo control loops

Procurement Notes

Verify the suffix JP indicates the J version operating range of 0°C to +70°C. Confirm the package type matches the required 28-pin PDIP configuration. Ensure supply voltages are strictly maintained within ±5% of nominal ±5 V levels. Check that analog and digital grounds are properly referenced to prevent offset errors during acquisition.

Selection Notes

Select the AD7871JP when a parallel or byte interface is required alongside 14-bit resolution. Choose this component over the AD7872 if system architecture demands multi-format data output flexibility. Verify that the 83 kSPS throughput meets the Nyquist requirements for the specific input bandwidth. Consider the internal clock stability versus external clock synchronization needs for jitter-sensitive applications.

Part Context

The AD7871 is part of the AD7871/AD7872 family of fast, complete 14-bit sampling ADCs. While the AD7872 offers only serial output in a smaller footprint, the AD7871 provides comprehensive interface options including parallel and byte modes. Both devices share identical core conversion performance and analog specifications but differ in digital connectivity and pin count.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. No cross-model substitutes are listed in the ordering guide or revision history.