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PecanPi® Implementation, Spec, & Test Results

Implementation

DAC Chips

Dual flagship Burr-Brown PCM1794As in monaural mode

Digital HW Volume Control and Re-clocking

  • Crystek CCHD-575 oscillator — ultra-low clock jitter of 82fSec
  • SRC4193 for volume control

S/PDIF Receiver

Cirrus Logic CS8416 (starting at DAC rev 3.0)

Output stage

True balanced dual differential output stages, using OPA1612s, low noise Panasonic resistors, and proprietary filtering topology.

Ultra-low Noise Linear Power Supplies

  • LT3045 (0.8uV noise) for positive op-amp power supply
  • LT3090 (18uV noise) for negative op-amp power supply
  • LT3042 (0.8uV noise) for DAC Chips

Headphone Driver

  • Dual parallel OPA1622s for regular headphones
  • Quad parallel OPA1622s for balanced headphones

Specifications

XLR Output (including headphone driver):

  • Signal-to-Noise Ratio (SNR): 130dB (A-weighted)
  • Residual Noise: 1.6uV (A-weighted)
  • Dynamic Range (DNR): 125dB
  • Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
  • Frequency Response: DC (0Hz) to 22kHz @ 48kHz sample rate
  • Frequency Response: DC (0Hz) to 44kHz @ 96kHz sample rate
  • Frequency Response: DC (0Hz) to 88kHz @ 192kHz sample rate
  • Output Voltage: 5Vrms (+16.2dBu)
  •  

Balanced Headphone Output:

  • Power into 32Ω: 1.56W peak
  • Power into 150Ω: 333mW peak
  • Power into 600Ω: 83.5mW peak
  • Damping Factor: >210

Input Power:

  • Input Connector:  Barrel Plug, 2.1mm I.D. x 5.5mm O.D. x 9.5mm
  • Input Voltage: 9VDC
  • Input Power: 20W Max (w/ Raspberry Pi)

Size:

  • Streamer / Ultra: 195 x 120 x 100mm (7.7 x 4.75 x 4.25in) 
  • DAC: 97mm (3.82”) x 78.5mm (3.09”) x 38.1 mm (1.5”)

RCA Output (including headphone driver):

  • Signal-to-Noise Ratio (SNR): 124dB (A-weighted)
  • Residual Noise: 1.6uV (A-weighted) 
  • Dynamic Range (DNR): 122dB
  • Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
  • Frequency Response: DC (0Hz) to 22kHz @ 48kHz sample rate
  • Frequency Response: DC (0Hz) to 44kHz @ 96kHz sample rate
  • Frequency Response: DC (0Hz) to 88kHz @ 192kHz sample rate
  • Output Voltage: 2.5Vrms  (+10.2dBu)

Regular Headphone Output:

  • Power into 16Ω: 781mW peak
  • Power into 32Ω: 390mW peak
  • Power into 150Ω: 83.5mW peak
  • Power into 300Ω: 41.6mW peak
  • Damping Factor: >230

General

  • Sampling Rates: 44.1, 48, 88.2, 96, 176.4 and 192kHz
  • Bit Rates: 16 and 24-bit
  • Formats: Supports all formats.
  • DAC Compatible Rpi Models: 1B+, 1A+, 2B, 3B, 3B+, 4B, 5, Zero, & ZeroW
  • DAC Compatible Asus Models: Tinker Board & Tinker Board S
  • S/PDIF Input: Compatible with all sampling and bit rates listed above

Test Results

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