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PecanPi® USB - DAC and Headphone Amplifier


Senior Member
Aug 24, 2018
Succasunna, NJ
Introducing the PecanPi® USB
IMG_1437.JPG IMG_1436.JPG

DAC chips:

  • Dual flagship Burr-Brown PCM1794As in monaural mode
  • Crystek CCHD-575 oscillator -- ultra-low clock jitter of 82fSec
  • SRC4193 for reclocking
Output stage: True balanced dual different output stages
  • Uses OPA1612s
  • 0.1% low noise Panasonic resistors
  • 1% high-quality COG capacitors
  • Proprietary filtering topology
Ultra-low noise linear power supplies:
  • TPS7A4700 (4.17uV noise) for positive op-amp power supply
  • TPS7A3301 (16uV noise) for negative op-amp power supply
  • TPS7A4901 (15.4uV noise) for DAC Chips
USB Interface
  • miniDSP - USB Streamer Kit
    • XMOS asynchronous USB to I2S
OS Compatability
  • Windows: ASIO driver
  • MAC OS X: driverless
  • Linux Alsa 2.0: Compliant
  • Android/iOS: Compliant
Input Power
  • Input Connector: Barrel Plug, 2.1mm I.D. x 5.5mm O.D. x 9.5mm
  • Input Voltage: 9VDC
  • Input Power: 20W
  • Sampling Rates: PCM up to 192kHz
  • Bit Rates: Up to 24-bit

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Dashboard View XLR
Dashboard (XLR).JPG

Dashboard View RCA
Dashboard (RCA).JPG

Dynamic Range XLR (a-weighted)
Dynamic Range (XLR).JPG

Dynamic Range RCA (a-weighed)
Dynamic Range (RCA).JPG

Frequency Response XLR
Frequency Response (XLR).JPG

Frequency Response RCA
Frequency Response (RCA).JPG

THD+N vs Frequency at 0dBFS XLR

THD+N vs Frequency at 0dBFS RCA

THD+N vs Level XLR
THD+N vs Level (XLR).JPG

THD+N vs Level RCA
THD+N vs Level (RCA).JPG

Intermodulation Distortion XLR

Intermodulation Distortion RCA

Jitter Spectrum and Noise XLR
Jitter (XLR).JPG

Jitter Spectrum and Noise RCA
Jitter (RCA).JPG

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