WM8985CGEFL Equivalent & Substitute Parts

Part Overview

The WM8985CGEFL is a stereo audio codec interface manufactured by Cirrus Logic Inc., designed for 24-bit I2S and PCM audio applications. This component integrates 2 ADCs and 2 DACs with Sigma Delta modulation, delivering 92.5 dB and 98 dB signal-to-noise ratios respectively. The device operates across analog supply voltages of 2.5V to 3.6V and digital supply voltages of 1.71V to 3.6V, with an operating temperature range of -40°C to 85°C.

The WM8985CGEFL is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for legacy systems or new designs requiring compatible audio codec functionality.

Substiute Parts

WM8985CGEFL

Cirrus Logic Inc.In Stock: 969WM8985CGEFL Datasheet

Current PartRFQ

WM8904CGEFL/RV

Cirrus Logic Inc.In Stock: 110416WM8904CGEFL/RV Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WM8985CGEFL is determined by the following critical parameters:

Resolution (Bits): Both the main part and substitute must support 24-bit audio resolution to maintain signal fidelity and compatibility with existing audio processing pipelines.

ADCs / DACs Configuration: The substitute must provide 2 ADCs and 2 DACs to match the stereo audio processing capability of the original part.

Sigma Delta Modulation: The substitute must incorporate Sigma Delta modulation to ensure equivalent noise shaping and audio quality characteristics.

Operating Temperature Range: The substitute must support the full -40°C to 85°C operating temperature range to maintain functionality across industrial and commercial applications.

Mounting Type and Surface Mount Compatibility: Both parts must be surface mount devices to ensure compatibility with existing PCB layouts and assembly processes.

RoHS and Environmental Compliance: The substitute must maintain RoHS compliance and REACH unaffected status to satisfy regulatory requirements.

The WM8904CGEFL/RV meets these substitution criteria while offering an active product status, improved availability, and enhanced supply voltage flexibility.

Parameter Comparison

Engineering Selection Recommendations

The WM8904CGEFL/RV is the manufacturer-recommended substitute for the obsolete WM8985CGEFL. Both devices maintain identical core audio specifications: 24-bit resolution, 2 ADCs and 2 DACs, Sigma Delta modulation, and full -40°C to 85°C operating temperature coverage.

The WM8904CGEFL/RV offers active product status with significantly higher inventory availability (110,362 units in stock versus 871 units for the WM8985CGEFL), ensuring long-term supply chain reliability. Both parts maintain equivalent regulatory compliance with REACH unaffected status and EAR99 export classification.

Key design considerations include package footprint differences: the WM8985CGEFL uses a 32-QFN (5x5) package while the WM8904CGEFL/RV uses a 32-QFN (4x4) package. PCB layout modifications are required to accommodate the smaller footprint of the substitute part. Additionally, the WM8904CGEFL/RV features a reduced analog supply voltage range (1.71V to 2V) compared to the WM8985CGEFL (2.5V to 3.6V), requiring verification that existing power supply designs operate within the substitute's specified voltage window. The WM8904CGEFL/RV maintains ROHS3 compliance, representing an updated environmental standard relative to the RoHS compliance of the original part.

Frequently Asked Questions (FAQ)

Q: Can the WM8904CGEFL/RV directly replace the WM8985CGEFL without PCB modifications?

A: No. While both devices are 32-QFN packages, the WM8985CGEFL uses a 5x5 footprint and the WM8904CGEFL/RV uses a 4x4 footprint. PCB layout modifications are required to accommodate the smaller package dimensions.

Q: What are the critical differences in power supply requirements between these two parts?

A: The WM8985CGEFL requires analog supply voltage between 2.5V and 3.6V, while the WM8904CGEFL/RV operates with analog supply voltage between 1.71V and 2V. Designs must verify that power supply circuits can deliver the lower voltage range required by the substitute part.

Q: Are the audio quality specifications equivalent between these two codecs?

A: Both parts deliver 24-bit resolution with Sigma Delta modulation. The WM8904CGEFL/RV exhibits slightly lower S/N ratios: 91 dB for ADCs (versus 92.5 dB) and 96 dB for DACs (versus 98 dB). These differences are within typical audio application tolerances.

Q: What is the impact of the different Moisture Sensitivity Levels (MSL)?

A: The WM8985CGEFL has MSL 1 (unlimited shelf life), while the WM8904CGEFL/RV has MSL 3 (168-hour limit after moisture exposure). The substitute part requires stricter moisture control during storage and handling to prevent degradation.

Q: Are both parts compatible with I2S and PCM audio interfaces?

A: The WM8985CGEFL explicitly supports I2S and PCM data interfaces. The WM8904CGEFL/RV data interface specification is not provided in the available documentation. Detailed datasheet review is necessary to confirm interface compatibility for specific audio protocol requirements.

Q: What is the inventory status for each part?

A: The WM8985CGEFL has 871 units in stock (obsolete status). The WM8904CGEFL/RV has 110,362 units in stock (active status), providing substantially greater availability for production and design implementation.