PCM1750U

ADCs/DACs - Special Purpose Overview

The PCM1750U is a dual 18-bit CMOS analog-to-digital converter designed for digital audio applications. It features true co-phased inputs with internal sample/hold functions and an integrated band-gap reference. The device operates on ±5V supplies, dissipating a maximum of 300mW. Key electrical specifications include a minimum conversion time of 4.5μs, a dynamic range of +88dB (THD+N at –60dB), and a signal-to-noise ratio of +88dB at 192kHz sampling. It supports 4X oversampling per channel to relax anti-aliasing filter requirements and outputs serial data in MSB-first binary two's complement format.

ADCs/DACs - Special Purpose Feature Summary

• Dual 18-bit resolution with simultaneous left/right channel sampling
• Internal sample/hold and band-gap reference circuitry
• Low power consumption: 300mW max at ±5V supplies
• Serial output compatible with standard digital filters

ADCs/DACs - Special Purpose Applications

• Digital audio recording systems
• Professional audio mixing consoles
• High-fidelity audio digitization equipment

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type matches the required footprint; the 'U' suffix denotes a 28-pin Plastic SOIC. Confirm supply voltage compatibility with ±5V analog and +5V digital rails. Check for RoHS compliance status if environmental regulations apply to the target assembly. Ensure the design accounts for the specified operating temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Selection Notes

Select this component when 18-bit resolution and low power are prioritized over higher bit-depth converters. It is suitable for systems requiring co-phase sampling to minimize stereo phasing errors. Designers must provide external clocking via Pin 4 and a Convert Command on Pin 11. Consider using the companion DF1750 digital filter to fully utilize the 4X oversampling capability and achieve optimal THD+N performance.

ADCs/DACs - Special Purpose Part Context

The PCM1750U belongs to the Burr-Brown PCM17xx series of audio ADCs. It is functionally similar to the PCM1750P but utilizes a Surface Mount Technology (SMT) package instead of a through-hole DIP. This series was engineered to provide high dynamic range with simplified external component counts by integrating references and S/H circuits on-chip.

ADCs/DACs - Special Purpose Replacement Considerations

The PCM1750P is the pin-compatible through-hole alternative within the same family. No direct modern equivalents with identical specifications are listed in the provided documentation. Verify interface timing and pinout compatibility before substituting with other 18-bit or 24-bit audio ADCs.