orchardaudio
23-03-2019, 02:15
Meet the PecanPi DAC
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The PecanPi DAC is the only DAC for the RapsberryPi that utilized dual DACs in monaural mode. It also features true balanced dual differential output stages along with full HW digital volume control and re-clocking using a Crystek femtosecond jitter oscillator.
Specifications for XLR Output:
Signal to Noise Ratio (SNR): 130dB (A-weighted)
Dynamic Range (DNR): 125dB
Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
Output Voltage: 5Vrms
Specifications for RCA Output:
Signal to Noise Ratio (SNR): 127dB (A-weighted)
Dynamic Range (DNR): 121dB
Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
Output Voltage: 2.5Vrms
Specifications for Headphone Amplifier:
390mW peak power into 32 ohms
780mW peak power into 16 ohms
General Specifications:
Sample Rates: Up to 192kHz
Bit Rates: Up to 24-bit
Compatible Rpi Models: 1B+, 1A+, 2B, 3B, 3B+ Zero, ZeroW
Optional Case Size: 125mm (5") x 125mm (5") x 70mm (2.8")
Bi-amp speakers by using XLR and RCA at the same time.
Test Results:
THD+N vs Frequency at 0dBFS (XLR)
25617
THD+N vs Level at 1kHz. (XLR)
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Jitter Spectrum and Noise 256k point FFT with 16 averages(XLR)
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Implementation Details:
DAC chips:
Dual flagship Burr-Brown PCM1794A (http://www.ti.com/product/PCM1794A)s in monaural mode
Digital HW Volume Control and Re-clocking:
Crystek CCHD-575 (http://www.crystek.com/crystal/spec-sheets/clock/CCHD-575.pdf) oscillator -- ultra low clock jitter of 82fSec
SRC4193 (http://www.ti.com/product/SRC4193) for volume control
Output stage: True balanced dual different output stages
Uses OPA1612 (http://www.ti.com/product/OPA1612)s
Low Noise Panasonic Resistors
Proprietary filtering topology
Ultra low noise analog power supplies:
TPS7A4700 (http://www.ti.com/product/TPS7A47) (4.17uV noise) for positive op-amp power supply
TPS7A3301 (http://www.ti.com/product/TPS7A33) (16uV noise) for negative op-amp power supply
TPS7A4901 (http://www.ti.com/product/TPS7A49) (15.4uV noise) for DAC Chips
Headphone driver:
Dual parallel OPA1622 (http://www.ti.com/product/OPA1622)s
It can be preordered here for $224.99 (25% off) until mid May:
https://orchardaudio.com/shop?olsPage=products%2Fpcnp-dac
All preorders will ship between June and August.
25612 25613
The PecanPi DAC is the only DAC for the RapsberryPi that utilized dual DACs in monaural mode. It also features true balanced dual differential output stages along with full HW digital volume control and re-clocking using a Crystek femtosecond jitter oscillator.
Specifications for XLR Output:
Signal to Noise Ratio (SNR): 130dB (A-weighted)
Dynamic Range (DNR): 125dB
Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
Output Voltage: 5Vrms
Specifications for RCA Output:
Signal to Noise Ratio (SNR): 127dB (A-weighted)
Dynamic Range (DNR): 121dB
Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
Output Voltage: 2.5Vrms
Specifications for Headphone Amplifier:
390mW peak power into 32 ohms
780mW peak power into 16 ohms
General Specifications:
Sample Rates: Up to 192kHz
Bit Rates: Up to 24-bit
Compatible Rpi Models: 1B+, 1A+, 2B, 3B, 3B+ Zero, ZeroW
Optional Case Size: 125mm (5") x 125mm (5") x 70mm (2.8")
Bi-amp speakers by using XLR and RCA at the same time.
Test Results:
THD+N vs Frequency at 0dBFS (XLR)
25617
THD+N vs Level at 1kHz. (XLR)
25616
Jitter Spectrum and Noise 256k point FFT with 16 averages(XLR)
25615
Implementation Details:
DAC chips:
Dual flagship Burr-Brown PCM1794A (http://www.ti.com/product/PCM1794A)s in monaural mode
Digital HW Volume Control and Re-clocking:
Crystek CCHD-575 (http://www.crystek.com/crystal/spec-sheets/clock/CCHD-575.pdf) oscillator -- ultra low clock jitter of 82fSec
SRC4193 (http://www.ti.com/product/SRC4193) for volume control
Output stage: True balanced dual different output stages
Uses OPA1612 (http://www.ti.com/product/OPA1612)s
Low Noise Panasonic Resistors
Proprietary filtering topology
Ultra low noise analog power supplies:
TPS7A4700 (http://www.ti.com/product/TPS7A47) (4.17uV noise) for positive op-amp power supply
TPS7A3301 (http://www.ti.com/product/TPS7A33) (16uV noise) for negative op-amp power supply
TPS7A4901 (http://www.ti.com/product/TPS7A49) (15.4uV noise) for DAC Chips
Headphone driver:
Dual parallel OPA1622 (http://www.ti.com/product/OPA1622)s
It can be preordered here for $224.99 (25% off) until mid May:
https://orchardaudio.com/shop?olsPage=products%2Fpcnp-dac
All preorders will ship between June and August.