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Summary of Contents for Benchmark ADC1 USB
- Page 1 Benchmark ADC1 USB Instruction Manual 2-Channel 24-bit 192-kHz Audio Analog-to-Digital Converter...
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Page 2: Table Of Contents
32K B-H FFT, -3 dBFS, 10 KHz Specifications Analog Audio Inputs Clock Reference Input Word Clock Reference Output Digital Audio Outputs Audio Performance Group Delay (Latency) LED Status Indicators AC Power Requirements Dimensions Weight ADC1 USB Instruction Manual – Rev C Page 2... -
Page 3: Overview
ADC1 USB to precise studio reference The Ext mode allows the ADC1 USB to lock to levels. The variable gain controls may be used an external clock reference. In Ext mode, the... - Page 4 ADC1 boxes when locked to AES/EBU or word clock reference signals. The word clock output from one ADC1 USB may be connected to the clock input on another ADC1 USB to expand the number of phase-accurate conversion channels.
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Page 5: Features
Multifunction clock input with auto-recognition of AES, SPDIF, Word Clock, or Super Clock • Word Clock output • Total jitter immunity with Benchmark’s, phase-accurate UltraLock™ technology • Simultaneous output of up to three different sample rates • Simultaneous dithered 16 and 24-bit outputs •... -
Page 6: Front Panel Descriptions
Factory Default Settings panel of the operating systems (e.g. The ADC1 USB can be easily reset to factory ‘AudioMIDI Setup’ in Mac OS X). default settings by pressing and holding the Mode Switch up for approximately 3 seconds. -
Page 7: Mode Display
If the Ext LED is flashing, the outputs. It does not display the sample rate ADC1 USB is set to sync to an external clock of the USB output. The USB sample rate is source and is locking to that source. The set within the software of the host computer. - Page 8 2X and 4X sample rates (88.2 if the ‘44’ and ‘x2’ LED's are on, the sample kHz, 96 kHz, 176.4 kHz, and 192 kHz). rate is 88.2 kHz (44.1 x 2 = 88.2). ADC1 USB Instruction Manual – Rev C Page 8...
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Page 9: Meter Switch
Peak Hold function and set the scale to a 1 dB step. The ADC1 USB has a very large dynamic Set the Meter Switch to “1” (center) to • range (especially when operating at 24-bit disable the Peak Hold function and set output word lengths). -
Page 10: First-Stage Gain Switch
-5 dB to +19 dB. In order to Set the switch to “20” (up) to select 20 • use the trim pots the Second-Stage Gain dB gain for the first-stage. Switch must be set to Calibrated (down). ADC1 USB Instruction Manual – Rev C Page 10... -
Page 11: Back Panel Descriptions
Optical Output has two modes of operation; AES/EBU and ADAT. The ADAT mode supports ADAT (44.1 and 48 kHz), ADAT S/MUX (88.2 and 96 kHz), and ADAT S/MUX (176.4 and 192 kHz). ADC1 USB Instruction Manual – Rev C Page 11... -
Page 12: Balanced Analog Line Inputs
Word Length = 16 bits TPDF dithered, connectors. Compliance with the 1 Vpp digital • or 24 bits audio standards increases the reliability of digital connections, and often allows increased transmission distances. ADC1 USB Instruction Manual – Rev C Page 12... -
Page 13: Toslink Optical Output
5 = Right a, 6 = Right b, 7 = Right TOSLINK, Type FO5, or 5 mm optical c, 8 = Right d connector. The ADC1 USB uses a special high- ** a, b, c, and d are successive •... -
Page 14: Word Clock Reference Output
ADC1 USB directly to a computer’s USB range of 50 to 60 Hz. At 110, the ADC1 USB output. The USB interface utilizes USB 1.1 will operate normally over a range of 90 to protocol, and is compatible with both USB 1.1... -
Page 15: Rack Mounting
Rack Mounting Rack Mount Coupler The ADC1 USB is part of Benchmark’s ½-wide System1™ product family. Each is one rack unit high and is exactly ½ the width of a standard 19” rack panel. The front panels on System1™ products have rack-mount holes that are machined to conform to standard rack-mount dimensions. -
Page 16: Performance
Frequency Response The above graphs show the frequency response of the ADC1 USB when it is operating at a 192-kHz sample rate. Note that the amplitude response is down by less than 0.05 dB at 10 Hz and 80 kHz. -
Page 17: Inter-Channel Phase Response
Inter-Channel Phase Response This graph shows that the differential phase is significantly better than ± 0.25º from 10 Hz to 20 kHz. ADC1 USB Instruction Manual Page 17... -
Page 18: Thd+N Vs. Level, 1 Khz
THD+N vs. Level, 1 KHz w/20 kHz LPF unweighted Below –4 dBFS, distortion is lower than the noise floor of the converter. Above –3 dBFS, distortion reaches a maximum value of only –107 dBFS. ADC1 USB Instruction Manual Page 18... -
Page 19: B-H Fft, Idle Channel Noise
32K B-H FFT, Idle Channel Noise The above graph demonstrates that the ADC1 USB is free from idle tones and clock crosstalk. The highest spurious tone measures –128 dBFS and is AC line related hum. The highest non-line related tone measures –135 dBFS. -
Page 20: B-H Fft, -3 Dbfs, 1 Khz
32K B-H FFT, -3 dBFS, 1 KHz The above FFT plot shows that the ADC1 USB has very little harmonic distortion. Distortion is exceptionally low and is dominated by 2 harmonic distortion. Note the near absence of spurious tones. ADC1 USB Instruction Manual... -
Page 21: B-H Fft, -3 Dbfs, 10 Khz
32K B-H FFT, -3 dBFS, 10 KHz The above FFT plot shows that the ADC1 USB is free from jitter-induced sidebands. Any jitter present at the conversion sampling circuit would produce sidebands equally spaced above and below the 10 kHz test tone. The tone at 20 kHz is due to second harmonic distortion, and measures almost 120 dB below full scale. -
Page 22: Specifications
Transformer Coupled DC Blocking Capacitors Transient and Over-Voltage Protection Jitter Attenuation Method Benchmark UltraLock™ Word Clock Reference Output Impedance Level 5 Vpp 2.5 Vpp into 75 Transformer Coupled DC Blocking Capacitors Transient and Over-Voltage Protection ADC1 USB Instruction Manual Page 22... -
Page 23: Digital Audio Outputs
44.1, 48, 88.2, 96, 176.4, or 192 kHz (at 24 bits) 44.1 or 48 (at 16 bits) Impedance Level 4 Vpp into 110 1 Vpp into 75 Transformer Coupled DC Blocking Capacitors Transient and Over-Voltage Protection ADC1 USB Instruction Manual Page 23... -
Page 24: Audio Performance
-0.10 dB at 22 kHz -3 dB at 23 kHz, -110 dB at 27 kHz Passband Ripple +/- 0.008 dB Crosstalk -105 dB at 20 kHz -130 dB at 1 kHz -200 dB at 20 Hz ADC1 USB Instruction Manual Page 24... -
Page 25: Group Delay (Latency)
Maximum Amplitude of AC line related Hum & Noise -130 dBFS Interchannel Differential Phase (Stereo Pair) +/- 0.5 degrees at 20 kHz Interchannel Differential Phase (Between ADC1 USB +/- 0.5 degrees at 20 kHz Units) Maximum Lock Time after Fs change <... -
Page 26: Ac Power Requirements
9.5” (249 mm) Height 1.725” (44.5 mm) Weight ADC1 USB only 3.6 lb. ADC1 USB with power cord, 3 BNC-to-RCA adapters, 4.9 lb. extra fuses, and manual Rack mount kit (blank panel, junction block, and rack- 0.32 lb. mount screws) Shipping weight 7 lb. -
Page 27: Adat S/Mux
Sample Rate Controls S/MUX that they can be properly decoded upon playback. Failure to properly decode an Most devices (including the ADC1 USB) S/MUX recording will add unwanted artifacts automatically enable and disable S/MUX in to the audio. The severity of these artifacts is response to changes in sample rate. -
Page 28: Ultralock
AES/EBU receiver will be reproduced without converter (ADC) or in an analog-to-digital the addition of any measurable jitter artifacts. converter (DAC). The ADC1 USB, DAC-104 and the ADC-104 Many converters use a single-stage Phase employ Benchmark’s new UltraLock™ Lock Loop (PLL) circuit to derive their... - Page 29 100 dB of stop-band attenuation. But, digital filters are designed using the mathematical assumption that the time interval between samples is a constant. Unfortunately, sample clock jitter in an ADC or DAC varies the ADC1 USB Instruction Manual Page 29...
- Page 30 It is therefore important to attack jitter at both ends of the audio chain. The ADC1 USB is a great start, as it will allow accurate assessment of various A/D converters. It is impossible to evaluate ADC performance without a good DAC.
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Page 31: Regulatory Compliance
Regulatory Compliance CE Certificate of Conformity ADC1 USB Instruction Manual Page 31... -
Page 32: Rohs Compliance
Canada, please refer to the Extended Two started, if requested by the customer. (2)** Year International Warranty. Attempts to deliberately deface, mutilate, or remove the product's label will render this warranty void. Any ADC1 USB with a serial ADC1 USB Instruction Manual Page 32... -
Page 33: Extended 2 Year International Warranty
Customer Service Department, is required when sending products for repair. They must be shipped to Benchmark Media Systems prepaid and preferably in their original shipping carton with the RMA number clearly visible on the exterior of the packaging. - Page 34 Copyright © 2007 Benchmark Media Systems, Inc. All rights reserved. Benchmark Media Systems, Inc. 5925 Court Street Road Syracuse, NY 13206-1707 +1-315 437-6300, FAX +1-315-437-8119 http://www.benchmarkmedia.com ADC1 USB Instruction Manual Page 34...
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