AD7878LPZ-REEL

Overview

The AD7878LPZ-REEL is a complete 12-bit analog-to-digital converter featuring an integrated DSP interface with an 8-word FIFO memory. It operates on dual ±5 V supplies and accepts a bipolar analog input range of ±3 V. The device provides a signal-to-noise ratio of 72 dB at a 10 kHz input frequency and supports sampling rates up to 100 kHz. Key electrical parameters include a maximum data access time of 41 ns, a typical power dissipation of 60 mW, and a conversion time of 7 μs. The component utilizes Linear Compatible CMOS (LC2MOS) technology.

Feature Summary

• Integrates an 8-word first-in, first-out memory buffer to reduce microprocessor servicing overhead.
• Includes an on-chip track/hold amplifier, 3 V zener reference, and 12-bit successive approximation ADC.
• Features a versatile DSP interface with fast 41 ns data access time for direct processor connection.

Applications

• Digital Signal Processing
• Speech Recognition and Synthesis
• Spectrum Analysis
• High Speed Modems
• DSP Servo Control

Procurement Notes

Verify the specific grade suffix 'L' corresponds to the required performance tier, specifically the 72 dB SNR and 41 ns access time, as opposed to other variants in the family. Confirm that the 'REEL' designation matches the required tape and reel packaging format for automated assembly processes. Ensure compatibility with the specified ±5 V supply requirements during system design validation.

Selection Notes

Select this model when a high-speed 12-bit ADC with integrated FIFO buffering is required for DSP applications. The LPZ variant offers a 41 ns data access time, suitable for interfacing directly with high-speed processors like the ADSP-2100 or TMS320 series. Consider the 72 dB SNR specification for applications demanding higher dynamic performance compared to the standard 70 dB grade options available in the AD7878 family.

Part Context

The AD7878 is part of Analog Devices' LC2MOS family of complete A/D converters designed for high-speed digital signal processing. This specific part number represents the Plastic Leaded Chip Carrier (PLCC) package version with the 'L' grade, indicating enhanced dynamic specifications including 72 dB SNR and 41 ns access time. The REEL suffix denotes the bulk tape packaging configuration intended for surface-mount assembly lines.

Replacement Considerations

Public confirmed substitute part numbers: AD7878LN, AD7878KP, AD7878BQ.