DENAFRIPS IRIS User manual

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
V1.0
19th July 2020
IRIS
DDC
OWNER’S MANUAL

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
Contents
1. INSTALLATION & SAFETY INSTRUCTIONS ........................................................................... 2
2. INTRODUCTION .................................................................................................................. 3
3. DESIGN HIGHLIGHTS ........................................................................................................... 4
3.1 DIGITAL ISOLATION ..................................................................................................... 4
3.2 FEMTO CRYSTAL OSCILLATOR ..................................................................................... 4
3.3 ADAPTIVE FIFO BUFFER RECLOCKING ......................................................................... 4
3.4 PROPRIETARY, STATE-OF-THE-ART USB INTERFACE ................................................... 5
3.5 DDC ARCHITECTURE .................................................................................................... 5
3.6 CLOCK IN ...................................................................................................................... 5
4. OPERATING INSTRUCTION .................................................................................................. 6
4.1 Quick Start Guide ........................................................................................................ 6
4.2 USB DRIVER INSTALLATION – WINDOWS OS ............................................................ 10
5. SPECIFICATIONS ................................................................................................................ 14
6. WARRANTY ....................................................................................................................... 15

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
1. INSTALLATION & SAFETY INSTRUCTIONS
This DDC is designed and built to provide trouble-free performance, but as with all
electronic devices it is necessary to observe a few precautions:
 Unpack the DDC carefully.
 Position the DDC on a stable, horizontal surface, i.e. sturdy rack.
 The DDC supports 100/250VAC mains voltage. Please check the voltage switch
underneath the DDC, switch it to the correct voltage before connecting the AC
mains. Please connect the AC power cord with earth(ground) pin unless it is
absolutely required to reduce hum from the ground loops of the connected devices.
 Always ensure that when disconnecting and reconnecting your audio equipment the
mains supply is turned off.
 Position the power cord and signal interconnects where they are not likely cause trip
and fall hazard.
 Do not use the DDC near water, or place water-filled containers on the DDC. Entry of
liquid into the DDC is hazardous and may cause electric shock and/or fire hazard.
 Do not place the unit under direct sunlight or heat source.
 Do not remove any covers or try to gain access to the inside. There are no user
adjustments or fuses to change without qualification.
 Clean regularly with a damp soft cloth. Do not use any cleaning agents as it might
damage the surface finishing.
 The electronics in modern hi-fi equipment is complex and may, therefore, be
adversely affected or damaged by lightning. For protection of the audio system
during electrical storms, disconnect the mains plugs.

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
2. INTRODUCTION
Thank you for purchasing the DENAFRIPS IRIS DDC.
The entry DDC, built upon the success of the DENAFRIPS Digital Know-How. IRIS DDC isolates
and buffers the USB input data, re-clock them via the local FEMTO Crystal Oscillators. The
cleansed, ultra-low jitters digital output can be connected to any external DAC.
It transforms the Computer Audio System into a high-quality transport. The sonic
improvement is evident as soon as the IRIS DDC is added into the Digital Audio chain.

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
3. DESIGN HIGHLIGHTS
3.1 DIGITAL ISOLATION
The IRIS Digital Signals are completely isolated by the 50-Mbps high speed photocouplers.
The optical isolation yields even lowered noise-floor and achieved high signal to noise ratio.
3.2 FEMTO CRYSTAL OSCILLATOR
The IRIS is equipped with dual FEMTO Clocks operating at audio frequencies 45.1584Mhz,
49.152Mhz. The dual FEMTO Clocks are powered by the o-core transformer, multi-stages
linear regulators. The clean linear power supply ensure superior stability and linearity of the
FEMTO Clocks output frequency.
3.3 ADAPTIVE FIFO BUFFER RECLOCKING
The DENAFRIPS approach to address the jitters issue by FIFO BUFFER RECLOCKING. The
adaptive FIFO buffer store the source digital audio data in the memory. These data are read
from the memory using the FEMTO CLOCK, located right in the DDC.

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
3.4 PROPRIETARY, STATE-OF-THE-ART USB INTERFACE
The IRIS is equipped with the proprietary USB Audio Solution, powered by STM32F446
Advanced AMR Based MCU. DENAFRIPS redesigned and optimized circuitry, allow the DDC
to be used as high-end DDC with computers / streamers. It supports 24bit/768kHz PCM data
stream, and native processing of DSD up to DSD1024. It comes with licensed THESYCON USB
Driver for Windows Platform.
NOTE: The USB Module is designed to trigger on only when USB Input is selected. This is
intended design to reduce digital input interfaces cross-interference for best sound
reproduction.
3.5 DDC ARCHITECTURE
DIGITAL SIGNAL PROCESSING – All digital input data are stored in the on-board FPGA high-
speed RAM.
FEMTO CLOCKS – These data are read from the memory using the ultra-low phase noise,
super accurate FEMTO CLOCKS, located right in the DDC. The processed data are sent to the
digital outputs.
DIGITAL OUTPUTS – The cleansed, ultra-low jitters data are output via multiple digital
output interfaces simultaneously to the external DAC.
3.6 CLOCK IN
The IRIS supports clock in of audio frequencies 45.1584Mhz, 49.152Mhz. It makes a perfect
companion with the TERMINATOR-PLUS to synchronize the CLOCKS.

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
4. OPERATING INSTRUCTION
4.1 Quick Start Guide
Figure 1. Front Panel
(1) Setup Button
Press the setup button once to enable/disable the CLOCK-IN feature.
 Press Setup button once
 CLOCK light should be on/off as the Setup button is pressed momentarily
 CLOCK light on = Enable clock in
 CLOCK light off = Disable clock in
1
2

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
(2) Digital Audio Signal Input Sampling Rate
The following table illustrate the Input Sampling Rate LED status.
Base Sampling Rate Indicator Input Format
44.1 kHz
44.1K 44.1 kHz
88.2K 88.2 kHz
176.4K 176.4 kHz
352.8K 352.8 kHz
705.6K 705.6 kHz
48 kHz
48K 48 kHz
96K 96 kHz
192K 192 kHz
384K 384 kHz
768K 768 kHz
DSD
64 DSD 64
128 DSD 128
256 DSD 256
512 DSD 512
Table 1. Sampling Rate

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
Figure 2. Read Panel
Description:
(1) AC Power Supply
CAUTION! IRIS supports AC mains range from 100-250VAC. Please check the voltage switch
underneath the DDC, switch it to the correct voltage before connecting the AC mains.
(2) Digital Input Interface
IRIS support USB input only.
(3) Digital Output Interface
There are 5 Digital Output Interfaces, namely, COAX, AES, OPT, I2S-A, I2S-C. All outputs are
active simultaneously.
I2S-A HDMI (LVDS) I2S-C RJ45 (LVCMOS)
1
3
2
4

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
(4) CLOCK IN
The IRIS supports the following clock frequencies input, leveraging the high-quality OCXO of
the TERMINATOR-PLUS DAC, it may be connected to IRIS CLOCK-IN to improve the sonic
performance.
MASTER CLOCK
 45.1548MHz, 49.152Mhz

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
4.2 USB DRIVER INSTALLATION – WINDOWS OS
USB driver is required for Windows Operating System (Windows 7/8/8.1/10, X86/X64). The
USB driver is licensed by THESYCON to provide the highest quality audio playback for
Computer Audio System.
NOTE: Mac and Linux OS do not require the USB driver.
Installation Guide:
 Download the driver from the support page: https://www.denafrips.com/support
 Do not connect the USB cable from the computer to the DDC. Remove it before the
USB driver installation
 Double click the “DENAFRIPS_UsbAudio_v4.82.0” (or the latest version) to install the
USB driver.
 Follow the on-screen instruction to complete the installation
Figure 3. Welcome screen

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
Figure 4. Default Installation Directory
Figure 5. Preinstallation Successful

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
Figure 6. Completed
 Restart the computer to complete the installation
 Connect the USB cable to the DDC
 Power on the DDC. Select USB input
 The USB DDC shall be detected. The driver status can be monitored as follows
Figure 7. Taskbar & Control Panel

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
 Select DENAFRIPS USB DDC as default Windows OS Soundcard
Press Set Default button
Properties of the DENAFRIPS USB
DDC
Direct
-
Sound default format
ASIO Buffer Size
Playback software recommendation:
 roon
 JRiver
 Foobar2000
 Sonicstudio Amarra

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
5. SPECIFICATIONS
Description Parameters
AC Power 110VAC or 240VAC
Power Consumption < 20W
Digital Input USB
External Clock Input 45.1584MHz
49.152Mhz
Digital Output
Coax SPDIF via RCA
TOSLink x 1
AES/EBU x 1
I²S HDMI LVDS Standard
I²S RJ45 LVCMOS Standard
Supported Format (DSD) DSD64 All Input
DSD64 – DSD512 USB & I²S Only
Supported Format (PCM) 24bit/44.1, 48, 88.2, 96, 176.4, 192 kHz All Input
44.1 – 768 kHz USB & I²S Only
Dimension 220W x 250D x 44H mm (Feet +18mm)
Weight 3.5 Kg

© DENAFRIPS CO. LTD. & VINSHINE AUDIO PTE. LTD. (SINGAPORE)
ALL RIGHTS RESERVED
6. WARRANTY
DENAFRIPS IRIS purchased from the Authorized Distributor comes with 36 months of
warranty from the date of purchase / delivery (whichever later).
Defective
Within
Warranty Policy
First 30 Days
DENAFRIPS
to bear both way shipping fee.
Within 1st Year
Customer to bear one
-
way shipping fee.
DENAFRIPS
shall
cover the return shipping fee.
Within Warranty
Period
Customer to bear both way shipping fee.
DENAFRIPS
to repair
at free of charge.
Out of Warranty Customer to bear both way shipping cost. DENAFRIPS to
provide repair / maintenance services at cost.