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The ADC16 from Benchmark Media is a sixteen-channel, analog-to-digital converter with a flexible input/output routing solution. In keeping with the company's "pure audio" philosophy, the unit utilizes the UltraLockDDS clock system for virtually indistinguishable jitter. Sixteen transformerless analog inputs with 20 dB gain controls feed the eight converters that feature their own matched-impedance transmission lines, and jitter distortion is always a comfortable 135 dB below the level of music.
By avoiding an asynchronous sample rate conversion system, the converter is able to reduce latency and provide the most direct path from the analog to digital converter to the digital outputs. The UltraLockDDS clock system is based on technology originally intended for high-frequency RF communications systems. It features a fixed-frequency, low-phase noise oscillator with temperature compensation capable of +/-2 PPM frequency accuracy.
The UltraLockDDS system can lock to any sample rate between 28 and 200 kHz almost instantly and is designed with pull-up/pull-down sample rates to handle film or video transfers flawlessly. Jitter is always attenuated to levels that are well below audibility and jitter performance is identical in all modes of operation. A multi-format clock input automatically recognizes AES/EBU, S/PDIF, Wordclock, or Super Clock signals and is used to synchronize the digital outputs. The digital outputs can be clocked to the unit's high-precision internal clock and will automatically revert to the internal clock source if an external clock is interrupted.
With the installed FireWire card the unit can function as a sole interface for a FireWire-equipped DAW. For older systems, connection is possible via the ADAT or coaxial outputs to systems that support those input formats. Front-panel, nine-segment, single-sample accurate meters are included on each channel for monitoring of input levels. The meters can be set to display in 6 dB or 1 dB increments, and in both cases can be put into "peak-hold" mode, which will hold the highest-valued sample until the mode is reset. "Press-and-Hold" buttons are provided for critical settings to avoid any accidental resetting of the unit.
Sixteen channels of analog-to-digital conversion
Two DB25 connectors for transformerless balanced analog input
Input gain trim pots for each channel provide high performance over 20 dB range
Wide input sensitivity range
Nine-segment dual-range digital LED meters with "peak-hold"
Conversion at standard sample-rates (44.1, 48, 88.2, 96, 176.4, and 192 kHz) and will also lock to non-standard rates (anything between 28 kHz and 200 kHz)
Multi-function clock input with auto recognition of AES, S/PDIF, Wordclock, or Super Clock
Total jitter immunity with the company's phase-accurate UltraLockDDS technology
Four sets of digital outputs (balanced AES, coaxial, optical, FireWire)
Independently controlled sourcing (A/D or DAW) for each set of digital outputs
AES/EBU, ADAT, and ADAT S/MUX2 and S/MUX4 optical output formats
"Press-and-Hold" buttons to prevent catastrophic incidents
Internal international power supply with very wide operating range
Meets FCC Class B and CE emissions requirements
In the Box
Benchmark ADC16 - Analog to Digital Converter (FireWire)
Delay (Analog Input to Digital Output) 1.49 ms @ 44.1 kHz 1.37 ms @ 48 kHz 0.75 ms @ 88.2 kHz 0.68 ms @ 96 kHz 0.37 ms @ 176.4 kHz 0.34 ms @ 192 kHz
@192 kHz 2 Hz to 94 kHz, -3 dB, +0.0 dB 20 Hz to 20 kHz, +/- 0.02 dB @96 kHz 1 Hz to 47 kHz, -3 dB, +0.0 dB 20 Hz to 20 kHz, +/- 0.01 dB @48 kHz 1 Hz to 23.6 kHz, -3 dB, +0.0 dB 20 Hz to 20 kHz, +/- 0.01 dB
121 dB, A-weighted, 0 dBFS = +16 to +29 dBu 119 dB, unweighted, 0 dBFS = +16 to +29 dBu 117 dB, A-weighted at maximum gain, 0 dBFS = -10 dBV
+/- 0.001 dB @ 44.1, 48 kHz +/- 0.003 dB @ 88.2, 96 kHz +/- 0.007 dB @ 176.4, 192 kHz
-96 dB @ 20 kHz -120 dB @ 1 kHz <-135 dB @ 20 Hz
Jitter tolerance with no measurable change in THD+N performance >12.75 UI sine 100 Hz to 10 kHz >3.5 UI sine @ 20 kHz >1.2 UI sine @ 40 kHz >0.4 UI sine @ 80 kHz >0.29 UI sine @ 90 kHz >0.25 UI sine above 160 kHz
Maximum Amplitude of Jitter-Induced Sidebands: <-116 dB (10 kHz 0 dBFS test tone, 12.75 UI sinusoidal jitter at 1 kHz) Maximum Amplitude of Spurious Tones with 0 dBFS Test Signal: -130 dBFS Maximum Amplitude of Idle Tones: -130 dBFS
Audio Channels: 16 Input/16 Output Sample Rates: Up to 200 kHz Output Word Length: 24-bits External Interface: FireWire
Maximum Amplitude of AC Line Related Hum and Noise: -140 dBFS Inter-Channel Differential Phase (Stereo Pair): +/- 0.25° @ 20 kHz Inter-Channel Differential Phase (Between ADC16 Units): +/- 0.25° @ 20 kHz Maximum Lock Time After Fs Change: <8 seconds Mute on Sample Rate Change: Less than 8 seconds duration Mute on Loss of External Clock: After 5 seconds of no clock Mute on Lock Error: After 5 seconds of no lock
90~264VAC, 47-63 Hz, internal universal power supply
19 x 12.5 x 1.73" (483 x 318 x 44 mm)
7 lb (3.2 kg)
Benchmark ADC16 - Analog to Digital Converter (FireWire) Review