Verified Supplier | Shenzhen Longruixian...

Shenzhen Longruixiang Trade Co., Ltd.

China (Mainland) | Contact Details
Established 2008
Response Rate
Company Feedback
1 Transaction for US $30,000+ in 12 months

Quick Details

  • Brand Name: Topping
  • Model Number: D20
  • Type: Professional Amplifier
  • Channels: 3 (2.1)

Packaging & Delivery

Packaging Details: Dimensions:106*40*141 mm(not included the prominent part)
114*47*165 mm(includes protrusions)
Delivery Detail: 3-7days


1.Precision power circuit
2.LPF filter circuit
3.DIR-DAC circuit

TOPPING TP-D20 24/96 High-Bit Multi-function Decoder&USB&Optical &Coaxial DAC



Product description:


D20 uses in a wide range of devices ,such as computers, digital turntables, DVD players, digital playback that are with the USB interface, the coaxial output or optical output .



1, support for three types of input signal: SPDIF digital coaxial signal, SPDIF digital optical signals and USB signals, covering all common signal;

2, support for a wide range . Meet the PCM format, including 44.1kHz, 48kHz, 88.2kHz, 96kHz, 16bit to 24bit range, digital coaxial and digital optical signal can be the perfect support;

3, Use TI HIFI-level High Definition 192kHz 24bit DAC chip PCM1793;
4, Use the reception of the TI chip DIR9001, has the characteristics of ultra-low Jetter;

5, built-in Texas Instruments' TI's USB chip PCM2704, whichever is the digital output to the DAC chip decoder to get better results, as high-fidelity external sound card to replace the original sound card of the computer use;


6, all-aluminum chassis precision machining using CNC machining centers made superb visual impact and operating feel





Aluminum shell, exclusive thickening of the panel the 8MM before the panel and the 3MM,all CNC precison machining


The panel font using laser engraving technology,never fade
Power special handling instructions and UNLOCK instructions,conspicuous without glare
The rear panel is the CNC precision machining,perfect details,non-processing rough stamping process comparable
Coaxial input Block and analog output with high quality 24K gold-plated terminals, good contact, durable



Internal uses a lot of the fidelity of HIFI devices carefully matched






 PCB with Immersion Gold technology manufacturing, components on the PCB by automatic precision SMT processing






TP-D20, power supply customized, a manual, A USB cable




 The Precision power supply circuit


  D20 uses U.S. National's LM1875, external input power is converted into the the HIFI universal dual power.The power supply circuit with a capacitance of of Japan nichicon Gold and Panasonic HF FC Series capacitor ripple and noise control excellent.




  Fever LPF filter circuit

     Output signa of D20 DAC chip PCM1793 output signal contains the high-frequency waves, the active low-pass circuit LPF.LPF circuit uses the U.S. Texas Instruments HIFI op amp OPA2134, with the KOA resistors, capacitors Siemens, the ERO capacitor, capacitance to form nichicon Gold.


  High-accuracy USB-to-coaxial

      USB access to the signal from the Texas Instruments PCM2704 converted to SPDIF digital signal processing by the decoding circuit. D20 extension products customized for the PCM2704 with high precision crystal oscillator, to improve the stability and accuracy of this section.Although the PCM2704 can only support up to 48kHz/16bit, but the most common digital audio source is still 44.1kHz or 48kHz, 16bit, the PCM2704 already sufficient.



 DIR-DAC circuit

      This is the core of the D20 Part 2. Using a Texas Instruments the DIR9001 and PCM1793. The DIR9001 will input SPDIF signal conversion accepted by IIS signal as DAC, it has a very low jetter. PCM1793 converts to IIS into the output signal.





InputUSB input (supports USB 2.0 FULL SPEED, 48kHz, 16bit)
SPDIF format RCA coaxial input (44.1kHz-96kHz, 16bit-24bit)
SPDIF format optical input (44.1kHz-96kHz, 16bit-24bit)
OutputRCA Block output, analog signal strength is about 2.0VRMS
Distortion <0.0013% (A weighted)
Power supplyAC100V-240V (power adapter), DC15V (host)

106*40*141 mm(not included the prominent part)

114*47*165 mm(includes protrusions)



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Verified Supplier - Shenzhen Longruixiang Trade Co., Ltd.
China (Mainland) | Contact Details
Established 2008
Response Rate
Company Feedback
1 Transaction for US $30,000+ in 12 months