WM8741GEDS/V

Overview

The WM8741GEDS/V is a stereo digital-to-analogue converter (DAC) from Cirrus Logic, housed in a 28-lead SSOP package. It features a multi-bit sigma-delta architecture supporting PCM data word lengths of 16 to 32 bits and sampling rates up to 192 kHz. The device also handles DSD bit-stream formats for SACD applications. Electrical specifications include a typical SNR of 125 dB (A-weighted stereo at 48 kHz) and -100 dB THD. It operates with analogue supplies of 4.5 V to 5.5 V and digital supplies of 3.15 V to 3.6 V.

Feature Summary

• Advanced multi-bit sigma-delta architecture with selectable digital filters including linear, minimum phase, and non-half band responses.
• Supports PCM modes (32 kHz to 192 kHz) and DSD modes (Direct and Plus) with specific interface timing requirements.
• Includes fine resolution volume control (0.125 dB steps), soft mute, anti-clipping mode, and digital de-emphasis.
• Offers flexible control via 2-wire or 3-wire serial interfaces, or hardware control pins.

Applications

• Professional recording systems
• High specification CD, DVD, and SACD audio players
• Home theatre systems
• A/V receivers

Procurement Notes

Verify the ordering suffix 'V' indicates the tape and reel packaging variant with a reel quantity of 2,000 units, distinct from the tube-packaged 'DS' version. Confirm the temperature range is -0°C to +70°C and that the component is lead-free. Check for any product change notices regarding pin compatibility with the WM8740.

Selection Notes

Select this component when differential analogue voltage outputs are required. Ensure the system design accommodates separate analogue (AVDD) and digital (DVDD) supply rails within their specified ranges. Verify that the master clock frequency supports the desired sample rate, as MCLK must be established before audio data begins.

Part Context

The WM8741GEDS/V is part of the WM8741 family, which is pin-compatible with the WM8740. It serves as a high-performance alternative for stereo DAC applications requiring low jitter tolerance and advanced digital filtering capabilities. The device integrates dithered digital interpolation filters and a switched capacitor multi-bit stage.

Replacement Considerations

The WM8741 is pin-compatible with the WM8740. Designers replacing other components should verify if the target application requires the specific DSD support or filter characteristics unique to the WM8741 architecture.

FAQ

What are the supported digital audio input formats?

The WM8741 supports standard PCM formats including right justified, left justified, I2S, and DSP serial port interfaces. It also supports DSD bit-streams in both direct and PCM-converted (DSD Plus) modes.

How does the device handle power-up sequences?

The WM8741 includes internal Power On Reset circuits for both analogue and digital sections. DVDD must be established before MCLK starts, and AVDD must be established before the device outputs signals to ensure proper initialization.

What is the maximum load capacitance for the DAC outputs?

The maximum capacitance load for the differential analogue voltage outputs is 1 nF.