PecanPi® Implementation, Spec, & Test Results
Implementation
DAC Chips
Dual flagship Burr-Brown PCM1794As in monaural mode
Digital HW Volume Control and Re-clocking
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
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
