New Product Recommendation: Silipu Launches the TPDA7008, an 8-channel PDM-to-I2S/TDM Converter.

As a leading supplier of automotive and industrial interface solutions, Silipu has built upon the mature application framework of its audio‑transmission ASN chip to launch the TPDA7008—an 8‑channel PDM‑to‑I2S/TDM converter. This device is ideal for multi‑microphone array and high‑quality audio‑capture system designs, enhancing the ASN chip’s versatility across applications such as education and conferencing, while also serving standalone use in professional recording equipment, tablets, headphones, and other consumer electronics. The TPDA7008 offers low power consumption, a high signal‑to‑noise ratio, and flexible interface configurations. Moreover, it leverages a fully domestic supply chain, combining cost advantages with reliable delivery capabilities to ensure comprehensive supply‑chain security.

I. Multi-channel audio capture, enhancing the core user experience

As people increasingly rely on recording devices and their usage scenarios grow more complex, they have become ever more sensitive to sound quality. Single-microphone or limited‑microphone solutions can no longer meet the demands of high‑performance audio capture. Multi‑microphone array pickup, when integrated into multi‑channel data‑acquisition systems, does not merely amplify volume; rather, it fundamentally enhances the quality of captured speech, providing stable, reliable, high‑quality audio support for intelligent voice applications.

1. Advantages of the Duomai Array System

- Strong noise reduction and anti-interference capabilities: Multiple microphones simultaneously capture audio, which is then processed by an algorithm to distinguish speech from background noise and achieve precise noise suppression.

- Strong directivity: It can pick up sound in a specific direction, capturing audio only from a designated area.

- Echo and reverberation suppression: Multi-channel processing enables precise source localization, distinguishing between direct sound and reflected sound.

- Enhances speech recognition performance: Multi-channel data offers a higher signal-to-noise ratio, resulting in clear and stable far-field audio pickup.

- Strong sense of space: Multi-channel output delivers immersive stereo and surround sound, resulting in recordings that sound more natural and layered.

Currently, intelligent voice technology, far-field sound pickup, and immersive audio experiences are rapidly gaining traction, underscoring the growing importance of system‑level multi‑channel audio capture. Consequently, higher standards and more stringent requirements are being imposed on how multi‑channel acquisition and transmission are implemented.

Silicon Labs’ PDM-to-I2S/TDM converter, the TPDA7008, is specifically designed to process PDM data from multiple digital microphones and efficiently convert it into standard audio PCM format. This simplifies the audio‑capture front end of the entire system, minimizing the demand on processor I/O resources and enabling customers to rapidly build lightweight, high‑performance multi‑channel audio‑capture systems.

2. Product Features and Advantages

- High signal-to-noise ratio: The A-weighted SNR reaches up to 126 dB, making it ideal for high-fidelity recording and far-field voice recognition.

- High sampling rate: Supports 24-bit audio sampling, fully preserving audio details and compatible with high‑SPL digital microphones.

- Wide sampling rate: The output sampling rate supports 4 kHz to 192 kHz, covering the full range of applications from voice communication to Hi-Fi audio.

- Low-power design: With all 8 channels enabled and at a 48 kHz sampling rate, the operating current is only 2.5 mA (at a 1.8 V supply), and the shutdown current is less than 5 μA.

- Flexible interface configuration: Supports I2S and TDM (up to TDM‑16) output formats, enabling seamless integration with mainstream DSPs and microcontrollers.

- Dual-mode control: supports both I2C software configuration mode and hardware pin‑based control mode.

- Automatic clock management: When the bit clock (BCLK) is removed, the device automatically enters a power‑down state, further reducing power consumption.

- ESD: 7 kV; superior performance effectively enhances product reliability and service life.

- Operating temperature: -40℃ to 85℃

- Package type: 0.50 mm pitch QFN16, 3 mm × 3 mm; fully compatible with mainstream industry solutions for drop-in replacement.

II. Outstanding Objective Metrics to Ensure System Audio Recording Quality

In audio equipment development, objective metrics—such as FFT, group delay, and THD+N—are essential tools for evaluating the overall performance of an audio system. By providing quantifiable, repeatable measurements, they offer a scientific basis for the design, debugging, and optimization of audio devices. In the design of the TPDA7008, we likewise adhered to industry‑standard benchmarks for these objective parameters and implemented extensive optimization measures, achieving high‑level performance across all key metrics (detailed test results are shown in the accompanying figures). This approach reduced subsequent development costs and risks while significantly enhancing the product’s market competitiveness.

III. Easily build an audio capture frontend, freeing up processor I/O resources.

Currently, mainstream SoCs and DSPs typically feature only one or two PDM inputs. However, in many application scenarios, support for four or even eight microphone inputs is often required, which prevents certain functionalities from being implemented. Even when such implementations are feasible, they can consume substantial processor I/O resources, thereby increasing the design complexity.

By using the Silipu TPDA7008, multi-microphone requirements can be easily met, effectively saving DSP/SOC data and clock‑pin resources. Moreover, with just two TPDA7008 devices, up to 16 PDM microphone inputs can be supported while utilizing only a single data channel in TDM16 mode. From an overall design perspective, the TPDA7008 captures multi‑microphone data, converts it into PCM format, and outputs it via the TDM interface, significantly reducing the development complexity and cost of SOC/DSP implementations.

IV. Collaborate with ASN to Expand the Scope of Diverse Applications

The ASN series is a fully domestically developed audio data‑transmission interface chip independently designed by Silipu. Its main products include models such as TPDA1000, TPDA1001, TPDA1008, TPDA1009, TPDA1033, TPDA1100, and TPDA1101, and it is now widely used in automotive, conferencing, and educational systems. This chip enables precise phase alignment of multi‑microphone data and, with its ultra‑low latency, delivers highly efficient performance when paired with the TPDA7008. Together, they meet the core requirements for multi‑channel data acquisition and transmission, providing a comprehensive solution for microphone array system design.

As a bridge between digital microphones and digital audio processors, the TPDA7008 provides a robust hardware foundation for next‑generation smart audio devices. Combining high performance, low power consumption, and a compact form factor, it is an ideal choice for multi‑microphone recording systems. Looking ahead, Silipu will continue to drive the large‑scale adoption of the TPDA7008 in consumer products such as smart speakers, smartphones, tablets, and headphones. At the same time, the company will deepen its expertise in the audio interface domain, pursue ongoing product and technological innovation, and introduce more high‑performance, highly competitive audio components, thereby empowering the industry’s intelligent upgrade and supporting the high‑quality development of the audio sector.

(Source: Silipu Official Website)