RME / ADI-2 FS　AD/DAコンバーター

AD/DA converter

■ AD/DA converter
ADI-2 FS is a 2-channel high-end AD/DA converter with a precise and compact design. It provides high-performance AD/DA conversion function up to 192kHz for SPDIF, AES, and ADAT. The analog inputs are based on the highly regarded ADI-2 Pro advanced circuit design, which provides excellent low noise, distortion and frequency response. In addition, the latest RME clock technology "Steady Clock FS" installed suppresses the jitter value with the accuracy of femtosecond unit, and guarantees excellent sound quality regardless of the quality of the reference clock. ADI-2 FS also inherits the conversion technology of ADI-2 Pro. The adopted AK557x and AK4490 offer 192 kHz sampling frequency, low distortion and 120 dBA dynamic range.

When the input selection is set to DIG (digital), the device acts as a digital format converter with monitoring capabilities. The AD converter is disabled and the DA converter is used for digital input signal monitoring, rear output and headphone output. It can convert between SPDIF coaxial (or AES) and all professional or consumer status, ADAT formats. The "Analog Bypass" function, which connects the analog output circuit directly to the analog input circuit, also allows the ADI-2 FS to be used as an analog preamplifier. It can also be used as a balanced <> unbalanced converter.
The ADI-2 FS has a powerful headphone output that exceeds the proven high power headphone output used in many RME interfaces. With 0.45W per channel, 0.1Ω output impedance, maximum output level +19dBu, and very low THD, the new generation high power circuit is ideal for many headphones including IEM (In-ear Monitor). To demonstrate. It can be switched on/off by a relay without a click sound.
Power is supplied via the included external switching power supply. It is also ideal for applications such as development and measurement that require galvanic insulation.

■Technical specifications
AD
o SN ratio @ +19 dBu: 117 dB RMS unweighted, 121 dBA
o Frequency response @ 44.1 kHz, -0.1 dB: 5 Hz to 20.5 kHz
o Frequency response @ 96 kHz, -0.5 dB: 3 Hz to 45.5 kHz
o Frequency response @ 192 kHz, -1 dB: 2 Hz to 92.7 kHz
o THD @ -1 dBFS: -114 dB, 0.00015%
o THD+N @ -1 dBFS: -112 dB, 0.00025%
o Channel separation:> 110 dB
o AD maximum input level: +19 dBu
o Input: XLR or 1/4" TRS balanced
Input impedance: balanced: 36 kΩ, unbalanced: 18 kΩ
o Input sensitivity switching: +4 dBu, +13 dBu, +19 dBu @ 0 dBFS
DA
o SN ratio: 117 dB RMS unweighted, 120 dBA
o Frequency response @ 44.1 kHz, -0.1 dB: 10 Hz to 20.2 kHz
o Frequency response @ 96 kHz, -0.5 dB: 5 Hz to 44.9 kHz
o Frequency response @ 192 kHz, -1 dB: 3 Hz to 88 kHz
o THD@ -1 dBFS: -112 dB, 0.00025%
o THD+N @ -1 dBFS: -110 dB, 0.00032%
o THD @ -3 dBFS: -116 dB, 0.00016%
o Channel separation:> 110 dB
o Max maximum output level: +19 dBu
o Output: XLR or 1/4" TRS balanced
o Output impedance: XLR balanced 150 Ω, TS unbalanced 100 Ω
o Input sensitivity switching: +4 dBu, +13 dBu, +19 dBu @ 0 dBFS
DA- Stereo monitor output (Phones)
Common with DA. However, only the following points are different
o Output: 6.3 mm stereo TRS, unbalanced
o Output impedance: 0.1 Ω
o Output level @ 0 dBFS, load 100 Ω or more: +19 dBu (6.9 Vrms)
o Maximum power 32 Ω load: 0.7 W per channel (0.01% THD, +16 dBu, 4.9 Vrms)
o THD 32 Ω load @ +15 dBu: -110 dB, 0.0003%
Mode ANA (Analog input to analog output)
o SN ratio @ +19 dBu: 123 dB RMS unweighted, 126 dBA
o SN ratio @ +13 dBu: 119 dB RMS unweighted, 122 dBA
o SN ratio @ +4 dBu: 112 dB RMS unweighted, 115 dBA
o Frequency response -0.5 dB: 1 Hz to 120 kHz
o THD+N @ +19 dBu: -116 dB, 0.00016%
o Channel separation:> 120 dB
o Maximum input/output level: +22 dBu
Digital
o Clock: Internal, ADAT input, SPDIF input
o External clock jitter suppression:> 50 dB (2.4 kHz)
o Clock jitter during AD/DA conversion: almost zero
o Zero dropout guaranteed by PLL even with jitter of 100ns or more
o Bitclock PLL: Trouble-free even at variable speed of ADAT operation (varispeed)
o External clock (SPDIF) supported sample rate: 28kHz to 200 kHz
o External clock (ADAT) supported sample rate: 40kHz to 49kHz
o Internal clock: 32, 44.1, 48, 64, 88.2, 96, 176,8, 192 kHz