Related Manuals for Benchmark ADC1
Summary of Contents for Benchmark ADC1
- Page 1 Benchmark ADC1 Instruction Manual 2-Channel 24-bit 192-kHz Audio Analog-to-Digital Converter...
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Page 2: Safety Information
Do NOT substitute parts or make any modifications without the written approval of • Reorient or relocate receiving antenna. Benchmark Media Systems, Inc. Doing so • Increase the separation between the may create safety hazards and void the equipment and receiver. -
Page 3: Table Of Contents
Benchmark Extended Warranty Reading Sample Rates off of the Mode Display Programming the Aux Output ADAT or AES/EBU on the Optical Output 13 Resetting the ADC1 to Factory Default Settings Meter Display Adjusting Input Gain First Stage Gain Second Stage Gain Controls... -
Page 4: Overview
ADC1 an excellent choice for location resolution recordings. For example, the main recording, broadcast facilities, and mobile outputs of the ADC1 can be set to 192 kHz rigs. The internal power supply supports all 24-bits while the auxiliary output is set to international voltages and has generous 44.1 kHz 16-bits for a safety backup or CDR... - Page 5 The Auto mode allows the ADC1 to lock to an The ADC1 is phase accurate between external clock reference. In Auto mode, the channels, and between other ADC1 boxes ADC1 will follow changes in sample rate, when locked to AES/EBU or word clock and/or changes in the type of reference signal reference signals.
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Page 6: 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 7: Connections
(adapter cable required). automatically follows changes in sample-rate. Direct connection of piezo pickups is not When Auto mode is active the ADC1 will lock recommended as these pickups require higher to the external clock source. Benchmark’s input impedances (to prevent low-frequency UltraLock circuitry isolates the conversion roll-off problems). -
Page 8: Digital Outputs
110 Ohm load. Use 110 Ohm digital Digital Outputs cable when connecting this output to other The ADC1 has four digital audio outputs: devices. The use of analog audio cables may three Main Outputs and one Aux Output. -
Page 9: Spdif/Aes Bnc Main And Aux Outputs
The ADC1 ships with BNC-to-RCA ADAT Optical Output Mode adapters. These adapters allow easy interfacing with consumer-style digital • Data Format = ADAT interfaces. BNC to RCA coaxial cords are also • Word Length = 24 bits available from Benchmark. -
Page 10: Word Clock Reference Output
The AC input has a very wide input voltage range and can operate over a frequency range of 50 to 60 Hz. At 110, the ADC1 will operate normally over a range of 95 to 140 VAC. At 220, the ADC1 will operate normally over a range of 190 to 285 VAC. -
Page 11: Operation
Locking to an External Clock Source to the ADC1 conversion mode, while pressing The ADC1 can sync to a variety of external and holding the switch results in a different clock sources, including Word Clock, Super change. -
Page 12: Selecting A Fixed Frequency Using The Internal Clock Source
Black = Lit locked to an external clock source. If the Ext White = Not Lit LED is off, then the ADC1 is set to operate at Gray = Irrelevant a fixed sample rate using the internal clock source. If the Ext LED is on, the ADC1 is locked to an external clock. -
Page 13: Adat Or Aes/Ebu On The Optical Output
Resetting the ADC1 to Factory programmed it does not affect the Main Default Settings Outputs in any way. The ADC1 can be easily reset to Factory Default settings. To program the Aux Output Press down on the Mode Switch repeatedly to... -
Page 14: Adjusting Input Gain
(up) as shown in the diagram below. Input Gain Stages First Stage Gain Up Position Each channel on the ADC1 is equipped with a 3-position first-stage gain switch. The first To use the Gain Calibration gain stage provides exceptional noise... -
Page 15: Rack Mounting
The width of the ADC1 panel is exactly ½ that of a standard 19” panel. The ADC1 is one rack unit high. Either ear of the ADC1 can be mounted directly to a standard 19” rack. A machined junction block connects the other ear to a ½... -
Page 16: Using Adat S/Mux
Controls S/MUX using a standard 8-channel 44.1 or 48 kHz ADAT recorder. In either case it is important Most devices (including the ADC1) to identify S/MUX recordings so that they can automatically enable and disable S/MUX in be properly decoded upon playback. Failure to response to changes in sample rate. -
Page 17: Ultralock
(ADC) or in a analog-to-digital converter (DAC). The ADC1, DAC-104 and the ADC-104 employ Benchmark’s new UltraLock technology to Many converters use a single-stage Phase eliminate all jitter-induced performance Lock Loop (PLL) circuit to derive their problems. - Page 18 Any attempt to cure jitter outside of an ADC or DAC will prove ADC1 Instruction Manual Page 18...
- Page 19 It is therefore important to attack jitter at both ends of the audio chain. The ADC1 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 20: Performance
Performance Frequency Response The above graphs show the frequency response of the ADC1 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 21: 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 Instruction Manual Page 21... -
Page 22: 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 Instruction Manual Page 22... -
Page 23: 32K B-H Fft, Idle Channel Noise
32K B-H FFT, Idle Channel Noise The above graph demonstrates that the ADC1 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 24: 32K B-H Fft, -3 Dbfs, 1 Khz
32K B-H FFT, -3 dBFS, 1 KHz The above FFT plot shows that the ADC1 has very little harmonic distortion. Distortion is exceptionally low and is dominated by 2 harmonic distortion. Note the near absence of spurious tones. ADC1 Instruction Manual... -
Page 25: 32K B-H Fft, -3 Dbfs, 10 Khz
32K B-H FFT, -3 dBFS, 10 KHz The above FFT plot shows that the ADC1 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 26: Specifications
DC Blocking Capacitors Transient and Over-Voltage Protection Jitter Attenuation Method Benchmark UltraLock™ Worldclock 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 Instruction Manual Page 26... -
Page 27: Digital Audio Outputs
THD+N, 1 kHz at –1 dBFS -102 dBFS, -101 dB, 0.00089% THD+N, 1 kHz at –3 dBFS -107 dBFS, -104 dB, 0.00063% THD+N, 20 to 20 kHz test tone at –3 dBFS -106 dBFS, -103 dB, 0.00071% ADC1 Instruction Manual Page 27... - Page 28 -130 dBFS 0 dBFS test signal Maximum Amplitude of Idle Tones -145 dBFS Maximum Amplitude of AC line related Hum -130 dBFS & Noise Interchannel Differential Phase (Stereo Pair) +/- 0.5 degrees at 20 kHz ADC1 Instruction Manual Page 28...
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Page 29: Group Delay (Latency)
5 x 20 mm (2 required) ® 110 V setting – 0.5 A 250 V Slo-Blo Type ® 220 V setting – 0.5 A 250 V Slo-Blo Type Dimensions Form Factor ½ Rack Wide, 1 RU High ADC1 Instruction Manual Page 29... -
Page 30: Weight
(European Union) directive 2002/95/EC, or, RoHS (Restrictions of Hazardous Substances). RoHS Compliant Information As of July 01, 2006, All Benchmark Media Systems, Inc. products placed on the European Union market are compliant (containing quantity limit weight less than or equal to 0.1% (1000 ppm) of any homogeneous Lead (Pb), Mercury (Hg), Hexavalent Chromium (Cr VI), and flame retardant Polybrominated Biphenyls (PBB) or Polybrominated Diphenyl Ethers (PBDE)). -
Page 31: Certificate Of Conformity
Certificate of Conformity ADC1 Instruction Manual Page 31... -
Page 32: Warranty Information
In the event of failure of a product under this warranty, Benchmark Media Systems, Inc. will repair, at no charge, the product returned to its factory. Benchmark Media Systems, Inc. may, at its option, replace the product in lieu of repair. -
Page 33: Benchmark Extended Warranty
Benchmark Extended Warranty The Benchmark Extended 5* Year Warranty Benchmark Media Systems, Inc. optionally extends the standard one (1) year warranty to a period of five (5)* years from the date of delivery. *For the extended warranty to become effective, the original purchaser must register the product at the time of purchase either by way of the prepaid registration card or through the product registration section of the Benchmark Media Systems, Inc. - Page 34 Copyright © 2005 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 Instruction Manual Page 34...
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