AD7878JPZ-REEL

Overview

The AD7878JPZ-REEL is a complete 12-bit, 100 kHz sampling Analog-to-Digital Converter (ADC) fabricated in Linear Compatible CMOS (LC2MOS). It features an on-chip track/hold amplifier with a 2 μs acquisition time, a 3 V internal reference, and an 8-word First-In-First-Out (FIFO) memory. The device provides a DSP-compatible interface with a maximum data access time of 57 ns. It operates on dual ±5 V supplies and supports a bipolar analog input range of ±3 V. Key dynamic performance metrics include a Signal-to-Noise Ratio (SNR) of 70 dB at a 10 kHz input frequency and a typical power dissipation of 60 mW.

Feature Summary

• Integrated 8-word FIFO memory reduces software overhead by allowing multiple samples to be digitized before microprocessor servicing.
• DSP-compatible parallel interface with dedicated control signals for direct connection to high-speed processors like the ADSP-2100.
• On-chip status and control register enables programmable FIFO word counts and real-time monitoring of buffer status.

Applications

• Digital Signal Processing systems
• Speech recognition and synthesis hardware
• Spectrum analysis equipment
• High-speed modem implementations
• DSP servo control loops

Procurement Notes

Verify the specific grade suffix against the ordering guide to confirm temperature range and performance specifications. The JPZ designation indicates a Plastic Leaded Chip Carrier package with a commercial temperature range. Ensure the reel packaging matches the REEL7 or standard reel requirements for automated assembly processes.

Selection Notes

Select this component when interfacing directly with DSPs requiring low-latency data access and integrated buffering. The ±3 V input range and internal 3 V reference simplify biasing circuits. Consider the 57 ns access time compatibility with the target processor's bus speed and verify that the 28-pin PLCC package fits the PCB footprint constraints.

Part Context

This part belongs to the AD7878 family of complete ADCs designed specifically for digital signal processing applications. The J variant denotes a commercial temperature range (0°C to +70°C), while the P suffix identifies the 28-pin Plastic Leaded Chip Carrier package. The REEL suffix indicates tape-and-reel packaging for surface-mount technology.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7878KPZ (higher accuracy grade) or AD7878LPZ (faster access time). Verify that the substitute maintains the required SNR and access time specifications for the specific application bandwidth.