WM8781GEDS/V

ADCs/DACs - Special Purpose Overview

The WM8781GEDS/V is a stereo 24-bit audio Analog-to-Digital Converter (ADC) manufactured by Cirrus Logic. It supports sampling rates from 8kHz to 192kHz and features an internal operational amplifier for handling line-level inputs exceeding 1Vrms. The device includes a digital high-pass filter to remove DC offsets and offers hardware-configurable interface modes via dedicated pins. Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 102dB at 48kHz and Total Harmonic Distortion (THD) of -90dB. It operates with analogue supply voltages between 2.7V and 5.5V, and digital core supplies between 2.7V and 3.6V.

ADCs/DACs - Special Purpose Feature Summary

• Stereo 24-bit sigma-delta ADC with 102dB SNR (A-weighted @ 48kHz)
• Hardware-controlled interface supporting I2S, Left Justified, and Right Justified formats
• Integrated front-end op-amp accommodating input signals > 1Vrms
• Master or Slave clocking mode selectable via M/S pin

ADCs/DACs - Special Purpose Applications

• Recordable DVD Players
• Personal Video Recorders (PVRs)
• Set-Top Boxes (STB)
• Studio Audio Processing Equipment

ADCs/DACs - Special Purpose Procurement Notes

Verify the ordering suffix against the manufacturer's data sheet to confirm packaging type. The GEDS suffix indicates a tube package, while GEDR/RV indicates tape and reel. Ensure the temperature range (-25°C to +85°C) and Moisture Sensitivity Level (MSL3) align with assembly requirements. Confirm that the Pb-free status meets environmental compliance standards for the target market.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a low-cost, high-performance stereo ADC is required for recordable media applications. It is suitable for systems needing hardware-only configuration without serial control interfaces. Ensure the system clock (MCLK) supports the desired oversampling ratios (128fs to 768fs). Verify that the analogue supply voltage range (2.7V–5.5V) matches the available power rails in the design.

ADCs/DACs - Special Purpose Part Context

The WM8781 is part of Wolfson Microelectronics' (now Cirrus Logic) stereo ADC portfolio, designed specifically for consumer electronics and professional audio recording devices. It serves as a direct replacement for legacy stereo ADCs requiring simple hardware control. The device is often used in conjunction with DACs or CODECs in complete audio signal chains for home hi-fi and automotive equipment.

ADCs/DACs - Special Purpose Replacement Considerations

The WM8781GEDR is a functional equivalent with identical electrical characteristics but supplied in tape and reel packaging instead of tubes. Other models in the series may offer different pin counts or additional features such as integrated DACs, which require careful interface compatibility checks.