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Benchmark ADC1 USB Instruction Manual

2-channel 24-bit 192-khz audio analog-to-digital converter
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Benchmark ADC1 USB
Instruction Manual
2-Channel 24-bit 192-kHz
Audio Analog-to-Digital Converter

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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...

  • Page 2: Table Of Contents

    Inter-Channel Phase Response THD+N vs. Level, 1 KHz 32K B-H FFT, Idle Channel Noise 32K B-H FFT, -3 dBFS, 1 KHz 32K B-H FFT, -3 dBFS, 10 KHz Specifications Analog Audio Inputs Clock Reference Input ADC1 USB Instruction Manual Page 2...

  • Page 3: Overview

    ADC1 USB. sample rate, and will ignore any signal at the The ADC1 USB has a total of 5 digital outputs clock reference input. If Internal mode is (1 XLR, 2 coaxial, 1 optical and 1 USB) which...
  • Page 4 ADC1 USB 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.

  • 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 at two different sample rates • Simultaneous 16 and 24-bit outputs •...

  • Page 6: Front Panel Descriptions

    Output Programming Factory Default Settings Pressing up on the mode switch will cycle The ADC1 USB can be easily reset to Factory through the clock source and sample rate Default settings by pressing and holding the options for the Main Outputs. The Main Mode Switch up for approximately 3 seconds.
  • Page 7 Black = Lit the Ext Indicator. If the Ext LED is off, then White = Not Lit the ADC1 USB is set to operate at a fixed Gray = Irrelevant sample rate using the internal clock source. If this LED is illuminated then the ADC1 USB is locked to an external clock source.

  • Page 8: Meter Switch

    Main Outputs 16-bit 16-bit (24-bit) 4) Meter Display The ADC1 USB is equipped with a multi- ADAT or AES/EBU on the Optical function 9-segment LED meter. The Meter Output Switch selects either a 6 dB step or 1 dB step scale and controls the peak-hold function.

  • Page 9: First Stage Gain Switches

    • Set the Gain Switch to “10” (down) to select 10 dB gain for the first-stage. The ADC1 USB has a very large dynamic • Set the Gain Switch to “20” (up) to range (especially when operating at 24-bit select 20 dB gain for the first-stage.

  • Page 10: Back Panel Descriptions

    Main Outputs. recommended and may cause data transmission errors. • XLR connector, balanced, AES/EBU Many customers are more familiar with professional format, 24-bits consumer-style RCA-equipped SPDIF digital interfaces. The ADC1 USB ships with BNC-to- ADC1 USB Instruction Manual Page 10...

  • Page 11: Balanced Analog Line Inputs

    The Optical Output uses what is often called a plug, case on RCA plug) to XLR pins 3 and TOSLINK, Type FO5, or 5 mm optical connector. The ADC1 USB uses a special high- bandwidth version that supports AES/EBU ADC1 USB Instruction Manual...

  • Page 12: Aes/Ebu Xlr Output

    2 = Right, 3-8 = muted signals, and automatically follows changes in sample-rate. When Auto mode is active the ADAT S/MUX Optical Output ADC1 USB will lock to the external clock Mode source. Benchmark’s UltraLock™ circuitry isolates the conversion clock from any jitter •...

  • Page 13: Ac Power Entry Connector

    The AC input has a very wide input voltage range and can operate over a frequency • Windows Vista range of 50 to 60 Hz. At 110, the ADC1 USB • Windows XP will operate normally over a range of 90 to 140 VAC.

  • Page 14: 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 15: 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 16: 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 16...

  • Page 17: 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 17...

  • Page 18: 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 19: 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 20: 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 21: Specifications

    DC Blocking Capacitors Transient and Over-Voltage Protection Jitter Attenuation Method Benchmark UltraLock™ World Clock Reference Output Impedance 75 Ω Level 5 Vpp 2.5 Vpp into 75 Ω Transformer Coupled DC Blocking Capacitors Transient and Over-Voltage Protection ADC1 USB Instruction Manual Page 21...

  • Page 22: Digital Audio Outputs

    44.1 or 48 at 16 bits Impedance 110 Ω XLR 75 Ω BNC Level 4 Vpp into 100 Ω XLR 1 Vpp into 75 Ω BNC Transformer Coupled DC Blocking Capacitors Transient and Over-Voltage Protection ADC1 USB Instruction Manual Page 22...

  • Page 23: 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 23...

  • Page 24: 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 25: 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 26: 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 27: 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 28 100 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 28...
  • Page 29 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.

  • Page 30: Regulatory Compliance

    Regulatory Compliance CE Certificate of Conformity ADC1 USB Instruction Manual Page 30...

  • Page 31: 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 31...

  • Page 32: 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 33 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 33...

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