PCM1750U/1K

ADCs/DACs - Special Purpose Overview

The PCM1750U/1K is a dual 18-bit CMOS analog-to-digital converter optimized for dynamic signal applications. It features true co-phased inputs with an internal sample/hold function for each channel and includes an internal reference. The device operates on ±5V supplies with a maximum power dissipation of 300mW. Key electrical parameters include a minimum conversion time of 4.5μs, a typical Signal-to-Noise Ratio of 90dB at 192kHz sampling, and a Total Harmonic Distortion + Noise of -88dB without external adjustments. It supports 4X oversampling per channel and outputs serial data in a format compatible with digital filter chips.

ADCs/DACs - Special Purpose Feature Summary

• Dual 18-bit low-power CMOS A/D converter with co-phased sampling
• Internal reference and dual sample/hold functions
• Fast 4.5μs minimum conversion time including S/H
• Very low max THD+N of –88dB without external adjustments

ADCs/DACs - Special Purpose Applications

• Digital audio systems requiring high dynamic range
• Applications utilizing 4X oversampling to relax anti-aliasing filter requirements
• Systems compatible with companion digital decimation filters like the DF1750

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type matches the required form factor, as the PCM1750 is available in both 28-pin Plastic DIP (PCM1750P) and SOIC (PCM1750U). Confirm that the system design accommodates the specific ±5V analog supply and +5V digital supply requirements. Ensure the application circuit respects the absolute maximum ratings for input voltages and power dissipation to maintain device reliability.

ADCs/DACs - Special Purpose Selection Notes

Select this component when an 18-bit resolution with co-phased stereo sampling is required. It is suitable for designs operating at standard audio rates or higher oversampling frequencies up to 192kHz. Designers must account for the bipolar ±2.75V input range and ensure the digital interface logic levels are compatible with the specified VIH and VIL thresholds.

ADCs/DACs - Special Purpose Part Context

The PCM1750 is part of the Burr-Brown/Texas Instruments audio converter family. It is often paired with the DF1750 digital filter chip to achieve optimal performance through 4X oversampling and decimation. The 'U' suffix indicates the 28-pin SOIC package, while '/1K' typically denotes a reel packaging quantity, though specific packaging details should be confirmed with the distributor.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Designers should evaluate other dual 18-bit ADCs from the manufacturer's portfolio if pin compatibility or specific performance metrics differ.