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:

Multi-mic Beamforming: Enhancing voice clarity during calls.
Active Noise Cancellation (ANC): Processing external environmental noise for headphones.
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.

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.
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.
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:

Snapdragon SoC: Via SLIMbus or SoundWire for digital data.
Microphones: Up to 4-6 analog or digital MEMS microphones.
Headphone Jack: Driving the 3.5mm output (where applicable) with an integrated high-impedance amplifier.
Speaker Amps: Feeding signals to external “Smart Amps” like the WSA8810 for the main loudspeaker.

WCD 9340 Mobile Phone IC