Mini USB DAC Mini USB DAC Decoder PCM2704 USB Sound Card Analog DAC Decoding Board

Product Parameters

Power supply voltage: DC 5V (USB powered)

Distortion: THD+N: 0.006% (RL>10 K Ω)

Distortion: THD+N: 0.025% (RL=32 Ω)

Signal to noise ratio: 98 dB

Dynamic Range 98 DB

Earphone output power: 12MW (RL=32 Ω)

USB supports sampling rate: 16BIT/32-48KHZ

USB support system: WINXP/WIN7/WIN8, Apple MAC OS 9/OS X, Android 4.1 or above (requires models that support OTG)

Product Introduction

The main chip adopts PCM2704 USB decoding chip, which has better performance than the most commonly used low-end chip CM102S series on the market. The power supply is USB powered, and the output terminal can be directly connected to headphones or used as a front-end Digital output can provide SPDIF digital signals for more advanced DAC decoders to achieve better sound quality Due to being an external sound card, it avoids severe electromagnetic interference inside the chassis, improving signal-to-noise ratio and sound quality.

PCM2704 is a single-chip digital to analog conversion chip. It has two analog-to-digital conversion output channels and an integrated USB interface controller. The interface complies with the USB 1.1 standard. PCM2704 can receive 16 bit stereo or mono audio data with sampling rates of 48KHz, 44KHz, and 32KHZ. The chip integrates software volume and mute functions, which can synchronously adjust the volume and mute of the computer.

Product Features

What is a USB sound card?

The USB sound card is an external sound card that looks very much like a USB flash drive The top of the USB sound card has a USB cable, which is used to plug into the USB interface of the motherboard, while the other end of the sound card cable is used to connect to a regular speaker. Unlike other external devices that require a separate power supply, small USB devices are powered by the host and do not use an external power source. USB sound cards are no exception, as their USB cables have four strands in use, two of which are used to obtain power from the host, while the other two strands are information and data cables.

USB sound card is another rising independent sound card product, but it is closely related to the onboard AC'97 sound card. This is mainly due to the fact that the AC'97 sound card separates the digital and analog circuits of the sound card, and integrates the audio controller directly connected to the PCI bus into the chipset. This allows the digital to analog conversion circuit and analog output circuit of the AC'97 soft sound card to operate without relying on the PCI bus. That is to say, the use of the AC'97 specification allows the sound card to break free from the constraints of ISA bus and PCI bus, which is also a necessary condition for the formation of external independent sound cards such as USB. With the support of an operating system that supports the AC'97 soft sound card, when it is plugged into a USB interface, the system will automatically recognize it as an AC'97 codec and set it as a USB AC'97 controller. This is the general principle of forming a USB sound card.

The biggest advantage of a USB sound card is that as long as the machine provides a USB interface, you can enjoy the benefits of the sound card anytime and anywhere. The advantage of using a USB interface is that it reduces the digital to analog conversion process of sound, is not affected by motherboard circuit noise and voltage interference, and theoretically obtains purer sound signals. Moreover, using a USB interface is more flexible and convenient in terms of mobility. These are the main reasons why USB sound cards are recognized by most consumers in the market now.

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