WM8781GEDS/RV

ADCs/DACs - Special Purpose Overview

The WM8781GEDS/RV is a stereo 24-bit audio analog-to-digital converter (ADC) designed for recordable media applications. It features an internal operational amplifier to accommodate line-level inputs exceeding 1Vrms and includes a digital high-pass filter to remove DC offsets. The device supports sampling rates from 8kHz to 192kHz with master or slave clocking modes. Key electrical specifications include a signal-to-noise ratio of 102dB at 48kHz, total harmonic distortion of -90dB, and operation with analogue supply voltages between 2.7V and 5.5V.

ADCs/DACs - Special Purpose Feature Summary

• Stereo 24-bit sigma-delta ADC with 102dB SNR (A-weighted @ 48kHz)
• Internal op-amp accommodates analogue input signals greater than 1Vrms
• Hardware-controlled interface via FORMAT, IWL, and M/S pins
• Supports Master/Slave clocking with system clocks from 128fs to 768fs

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the ordering suffix when sourcing components. The 'DS' suffix indicates tube packaging, while 'RV' denotes tape and reel packaging containing 2,000 units per reel. Both variants share identical electrical characteristics and operate within the -25°C to +85°C temperature range. Confirm moisture sensitivity level MSL3 requirements during storage and assembly.

ADCs/DACs - Special Purpose Selection Notes

Select this component for hardware-controlled stereo digitization where register programming is undesirable. Ensure the analogue supply voltage (AVDD) is within the 2.7V to 5.5V range and the digital core (DVDD) remains between 2.7V and 3.6V. Verify that the required sampling rate aligns with the available oversampling ratios: 128x for 48kHz, 64x for 96kHz, and 32x for 192kHz.

ADCs/DACs - Special Purpose Part Context

The WM8781 is manufactured by Wolfson Microelectronics plc, which was acquired by Cirrus Logic. This specific part number represents a stereo ADC variant within the broader WM878x family. Unlike full audio codecs, it lacks digital-to-analogue conversion capabilities, focusing exclusively on high-fidelity analogue-to-digital conversion for recording chains.

ADCs/DACs - Special Purpose Replacement Considerations

The WM8781GEDR is a pin-compatible alternative offering identical functionality in a different package style. When substituting, verify that the target device supports the same hardware-controlled interface logic and maintains compatibility with the required 20-lead SSOP form factor.