Terra-BerryDAC 2

Terra-BerryDAC2 AK4490 DAC part side Terra-BerryDAC2i solder side RaspberryPi and Terra-BerryDAC AK4490 DAC with RCA board

Small High quality RaspberryPi Audio DAC.

Feature

  • Raspberry Pi HAT compatible, GPIO I2S connection
  • AKM AK4490 DAC PCM:up to 768KH/32bitz, DSD up to 11.2MHz
  • Two low jitter Crystal oscillator for MCLK 45.158400MHz/49.152000MHz
  • Re-clocking and up sampling by AKM AK4137 SRC with onboard MCLK osillator
  • Onboard I2S DoP decoder by AK4137
  • Independent power circuit for DAC VREF
  • Automatic MCLK selection by LRCLK frequency
  • Balance / Unbalance output
  • Independent DAC power input connector
  • Combo384 support
DAC2 AK4490 and AK4137

Topics

Terra-BerryDAC2 enhanced power unit.
  1. Separate power connector
    RPi
    +5V
    RPi
    GND
    DAC
    GND
    DAC
    +5V
  2. Enhanced power circuit

    Suppressing the fluctuation of VREF by separating the power supply circuit.

    analog power

General spec.

  • I2S input:PCM up to768KHz, DSD(I2S DoP) up to11.2MHz
  • SRC output(DAC input):
    PCM :705.6KHz/32bit or 768KHz/32bit
    DSD(DoP):DSD11.2MHz
*DoP marker are 0x05,0xFA,0xAA.

Description of Connectors

Connector description

Analog output pins

  1. Unbalance output: Rch out,GND/Rch out,GND
  2. Balance output : L+(HOT), L-(COLD), GND/R+(HOT), R-(COLD), GND

Switch and Indicator pins

I2S inputSW1SW2SRC output
(DAC mode)
LED1
Auto/Manual
LED2
PCM/DSD
Mode selection
PCMOFF--PCMOFFOFFAuto setting
DSD(DoP)OFF--DSDOFFONAuto setting
PCMONOFFPCMONOFFManual setting
PCMONONDSDONONManual setting
DSD(DoP)ONOFFPCMONOFFManual setting
DSD(DoP)ONONDSDONONManual setting
  • SW OFF is open/SW ON is short to GND
  • SW2 is ignored when SW1 is OFF
  • SRC output format

    I2S input Output mode
    (DAC input mode)
    Auto setting
    (SW1=OFF)
    PCM output
    (SW1=ON/SW2=OFF)
    DSD output
    (SW1=ON/SW2=ON)
    PCM 32KHz PCM 768KHz PCM 768KHz OFF
    PCM 44.1KHz PCM 705.6KHz PCM 705.6KHz DSD 5.6MHz
    PCM 48KHz PCM 768KHz PCM 768KHz DSD 6.1MHz
    PCM 88.2KHz PCM 705.6KHz PCM 705.6KHz DSD 5.6MHz
    PCM 192KHz PCM 768KHz PCM 768Hz DSD 12.2MHz
    PCM 384KHz PCM 768KHz PCM 768KHz DSD 12.2MHz
    DSD 2.8MHz
    (DoP 176.4KHz)
    DSD 11.2MHz PCM 705.6KHz DSD 11.2MHz
    DSD 5.6MHz
    (DoP 352.8KHz)
    DSD 11.2MHz PCM 768KHzz DSD 11.2MHz

    This spec depend on AK4137.

    System

    board connection
    Terra-Berry DAC with Raspberry Pi
    Raspberry Pi I2S DAC
    Terra-Berry DAC2 with Combo384
    Combo384 USB DAC

    * Combo384 connecter is not included.

    Network players

    Application RaspberryPi model
    Raspberry Pi B+ Raspberry Pi 2 B Raspberry Pi 3 B
    volumio-1.55 PCM:Up to 192KHz
    DSD:2.8MHz
    PCM:Up to 192KHz
    DSD:2.8MHz
    PCM:Up to192KHz
    DSD:2.8MHz
    volumio-2 Unconfirmed PCM:Up to192KHz
    DSD:2.8MHz
    PCM:Up to192KHz
    DSD:2.8MHz
    lightMPD-v1.0.2 PCM:Up to192KHz
    DSD:2.8MHz
    PCM:Up to192KHz
    DSD:2.8MHz
    --
    RuneAudio 0.3 PCM:Up to 192KHz
    DSD:2.8MHz
    Unconfirmed Unconfirmed
    RuneAudio 0.4 Unconfirmed Unconfirmed PCM:Up to192KHz
    DSD:2.8MHz
    PicoPlayer 2.05 PCM:Up to192KHz Unconfirmed Unconfirmed
    modeaudio
    Release: 2.7
    Unconfirmed PCM:Up to192KHz
    DSD:2.8MHz
    Unconfirmed
    modeaudio
    Release: 3.1 2016-12-05
    Advanced kernel
    Uunconfirmed PCM:Up to384KHz
    DSD:5.6MHz
    PCM:Up to384KHz
    DSD:5.6MHz
    *Pop noise will occur when DSD start play/stop, skip.