PecanPi®+

IMPLEMENTATION − SPECIFICATIONS − TEST RESULTS

Implementation

DAC CHIPS
Asahi Kasei Microdevices (AKM) flagship AK4499EXEQ combined with AK4191EQ

CLOCKING
Crystek CCHD-575 oscillator — ultra-low clock jitter of 82fSec

S/PDIF RECEIVER
Cirrus Logic CS8416

OUTPUT STAGE
True balanced fully 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): 133dB (A-weighted)
Residual Noise: 1.174uV (A-weighted)
Dynamic Range (DNR): 129dB
Total Harmonic Distortion + Noise (THD+N) @ 0dBFS:
-116dB or 0.00016%
Total Harmonic Distortion + Noise (THD+N) @ -6dBFS:
-119dB or 0.00011%
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: 5.22Vrms (+16.6dBu)

BALANCED HEADPHONE OUTPUT

Power into 32Ω: 1.7W peak
Power into 150Ω: 363mW peak
Power into 600Ω: 90mW peak
Output Impedance: < 60mΩ

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)

GENERAL:

Sampling Rates: 44.1, 48, 88.2, 96, 176.4, 192,
352.8, and 384kHz (S/PDIF limited to 192k)
Bit Rates: 16, 24 and 32-bits (S/PDIF limited to 24-bits)
Formats: Supports all formats. DSD is converter
to PCM before playback.
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

RCA OUTPUT (INCLUDING HEADPHONE DRIVER):

Signal-to-Noise Ratio (SNR): 128dB (A-weighted)
Residual Noise: 1.308uV (A-weighted)
Dynamic Range (DNR): 124dB
Total Harmonic Distortion + Noise (THD+N) @ 0dBFS:
-112dB or 0.00025%
Total Harmonic Distortion + Noise (THD+N) @ -6dBFS:
-116dB or 0.00016%
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: 2.61Vrms (+10.6dBu)

REGULAR HEADPHONE OUTPUT:

Power into 16Ω: 851mW peak
Power into 32Ω: 425mW peak
Power into 150Ω: 91mW peak
Power into 300Ω: 45.5mW peak
Output Impedance: < 550mΩ