WCD 9340 Mobile Phone IC
High-Performance Mobile Connectivity
The WCD 9340 Mobile Phone IC ensures seamless performance and excellent connectivity for modern smartphones. Designed to meet the demands of today’s technology, it provides efficient power usage and capabilities suited for diverse applications. WCD 9340 Mobile Phone IC
Compact and Reliable Design
This integrated chip (IC) is engineered with precision, ensuring it fits easily within a wide range of devices. Its compact design ensures stability, efficiency, and long-lasting performance for all your mobile applications. WCD 9340 Mobile Phone IC
Optimized for Versatile Applications
The WCD 9340 IC is not just about compatibility; it excels in a variety of tasks, including network communication and sound processing. Reliable and versatile, it is the ideal choice for manufacturers aiming to incorporate modern, high-quality components into their devices. WCD 9340 Mobile Phone IC
The Qualcomm WCD9340, often marketed under the Qualcomm Aqstic™ brand, is a high-fidelity audio codec IC (Integrated Circuit) designed primarily for flagship mobile devices. It gained prominence as the companion audio hub for the Snapdragon 835 and 845 platforms, powering iconic devices like the Samsung Galaxy S8/S9, LG G6/G7, and Xiaomi Mi 6/8. WCD 9340 Mobile Phone IC
The WCD9340 is not just a simple digital-to-analog converter (DAC); it is a sophisticated “Audio Subsystem” that manages everything from voice assistant wake-word detection to high-resolution “audiophile-grade” playback. WCD 9340 Mobile Phone IC
1. Technical Specification Summary
The following table outlines the core technical parameters of the WCD9340 based on its architectural design and performance benchmarks. WCD 9340 Mobile Phone IC
| Feature | Specification | Details |
| Manufacturer | Qualcomm | Part of the Aqstic Audio series |
| Platform Compatibility | Snapdragon 835, 845 | Designed as a companion codec |
| Max Sampling Rate | Up to 192 kHz / 384 kHz | High-Resolution playback (32-bit/384kHz) |
| Bit Depth | 24-bit / 32-bit | Supports Hi-Fi audio standards |
| DAC Dynamic Range | Up to 130 dB | Extremely low noise floor |
| THD+N (Playback) | < -109 dB | Total Harmonic Distortion + Noise |
| ADC Dynamic Range | Up to 109 dB | High-fidelity recording |
| Audio Channels | 8 Channels | Supports complex multi-mic/speaker setups |
| Digital Interfaces | SLIMbus, I2S, PCM, SoundWire | Flexible SoC communication |
| Voice Activation | Always-on Support | Optimized for Google Assistant/Alexa |
| Power Consumption | ~6mW (Low power playback) | Highly energy efficient |
| Package Type | 144-ball BGA / WLPSP | Ball Grid Array for dense PCB layouts |
| Operating Voltage | 1.8V (Digital) / 2.8V (Analog) | Dual rail for efficiency and signal purity |
2. Functional Capabilities
The WCD9340 is engineered to handle three primary domains: Playback (Rx), Recording (Tx), and Voice UI.
A. High-Fidelity Playback (DAC)
The IC features a dedicated hardware DAC that supports DSD (Direct Stream Digital) and high-resolution PCM audio. By integrating the DAC directly into the codec rather than using the SoC’s internal processing, Qualcomm reduces electromagnetic interference (EMI) and improves the Signal-to-Noise Ratio (SNR).
B. Advanced Recording & Noise Suppression
With support for up to 8 channels, the WCD9340 can manage:
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Multi-mic Beamforming: Enhancing voice clarity during calls.
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Active Noise Cancellation (ANC): Processing external environmental noise for headphones.
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High-AOP Microphones: Supporting high Acoustic Overload Point mics for recording in loud environments (like concerts) without clipping.
C. Always-On Voice UI
A key selling point of the WCD9340 is its dedicated DSP (Digital Signal Processor) for “Always-on, Always-listening” features. It can listen for specific trigger words (e.g., “Hey Google”) at a power draw as low as 0.65 mA, meaning it won’t significantly drain the battery while waiting for a command.
3. Comparison with Previous Generations
The WCD9340 represented a significant leap over the older WCD9335 (Snapdragon 820 era).
| Feature | WCD9335 (Older) | WCD9340 (Aqstic) |
| SNR | 115 dB | 130 dB |
| PCM Support | 24-bit / 192 kHz | 32-bit / 384 kHz |
| Idle Power | ~15 mA | ~9 mA |
| Speaker Driver | External Required | Integrated Class-D Support |
4. Hardware Integration & Repair Notes
Because the WCD9340 is a BGA (Ball Grid Array) chip, it is soldered directly to the smartphone motherboard using tiny solder balls.
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Common Failure Symptoms: If this IC fails, the phone may experience a “total audio loss” (no sound from speakers, earpiece, or microphone), or it may hang/loop at the boot screen if the SoC cannot communicate with the codec via the SLIMbus.
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Repair Difficulty: High. Replacing the chip requires a hot air rework station, high-quality flux, and precision “reballing” if a new chip isn’t used.
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Variants: You may see part numbers like
WCD9340-001. These are typically minor revisions or different manufacturing batches, but they are generally interchangeable within the same device model.
5. Typical Application Circuit
In a modern smartphone, the WCD9340 acts as the bridge between the digital brain (Snapdragon SoC) and the analog world (speakers and mics). It interfaces with:
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Snapdragon SoC: Via SLIMbus or SoundWire for digital data.
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Microphones: Up to 4-6 analog or digital MEMS microphones.
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Headphone Jack: Driving the 3.5mm output (where applicable) with an integrated high-impedance amplifier.
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Speaker Amps: Feeding signals to external “Smart Amps” like the WSA8810 for the main loudspeaker.
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