Page 2 - Safety Information
ADC1 Instruction Manual Page 2 Federal Communications Commission (FCC) Notice (U.S. Only) NOTICE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against ...
Page 3 - Contents
ADC1 Instruction Manual Page 3 Contents Overview 4 Features 6 Connections 7 Balanced Analog Line Inputs 7 Clock Reference Input 7 Digital Outputs 8 AES/EBU XLR Output 8 Optical Output 8 SPDIF/AES BNC Main and Aux Outputs 9 Word Clock Reference Output 10 AC Power Entry Connector 10 Fuse Holder 10 Ope...
Page 4 - Overview
ADC1 Instruction Manual Page 4 Overview The ADC1 is a reference-quality, 2-channel 192-kHz 24-bit audio analog-to-digital converter featuring Benchmark’s UltraLock ™ technology. The ADC1 is designed for maximum transparency. It is well suited for the most demanding applications in studios and master...
Page 6 - Features
ADC1 Instruction Manual Page 6 Features • Two analog-to-digital conversion channels • Two XLR balanced analog inputs providing high-performance over a 43 dB range • -14 dBu to +29 dBu input sensitivity range (at 0 dBFS) • Two 0 dB, 10dB, and 20 dB first-stage gain switches (1 per channel) • Two 41-d...
Page 7 - Connections; Balanced Analog Line Inputs; To adapt to unbalanced sources; Clock Reference Input
ADC1 Instruction Manual Page 7 Connections Main 24-Bit Digital Outputs Aux 24 or 16-Bit Digital Output Analog Line In AES/EBU ADAT/SPDI F SPDIF,AES WCOut AES, WC, SC Ref In Left Right Balanced Analog Line Inputs (XLR) Auxiliary Digital Output, BNC (AES) Clock Reference Input, BNC (AES, Wordclock, Su...
Page 8 - Digital Outputs; Main Outputs; Optical Output; AES/EBU Optical Output Mode
ADC1 Instruction Manual Page 8 Digital Outputs The ADC1 has four digital audio outputs: three Main Outputs and one Aux Output. Main Outputs • XLR connector, balanced, AES/EBU professional format, 24-bits • BNC connector, un-balanced, AES/EBU professional format, 24-bits, compatible with most SPDIF i...
Page 10 - Word Clock Reference Output; Fuse Holder
ADC1 Instruction Manual Page 10 Word Clock Reference Output This output provides a Word Clock signal for use with downstream components. AC Power Entry Connector The AC power input uses a standard IEC type connector. Within the USA and Canada, the ADC1 ships with a power cord. In other locations, a ...
Page 11 - Operation; Mode Switch and Display; To program the conversion mode; Programming the Outputs
ADC1 Instruction Manual Page 11 Operation Mode Display Mode Switch Meter Display Meter Switch Left First Stage Gain Right First Stage Gain Left Variable/Calibrated Gain Switch Right Variable/Calibrated Gain Switch Left Gain Preset Right Gain Preset Left Gain Right Gain Mode Switch and Display The AD...
Page 13 - Programming the Aux Output; To program the Aux Output; Meter Display
ADC1 Instruction Manual Page 13 Programming the Aux Output The Aux Output can be programmed to mirror the Main Outputs (bit for bit), or it can provide an independent low-resolution copy of the converted signal, at an independent sample rate. Column three of the Mode Indicator displays the Aux Outpu...
Page 14 - Adjusting Input Gain; First Stage Gain; To select the first stage gain; Second Stage Gain Controls
ADC1 Instruction Manual Page 14 The red 0 LED indicates that a full-scale digital code has been reached and that digital clipping has occurred. Full-scale events as short as one digital sample, will light the 0 LED. Short single-sample digital clipping events are often audible, and all 0 dBFS events...
Page 15 - Rack Mounting
ADC1 Instruction Manual Page 15 Down Position Rack Mounting To enable rack mounting, the front panel of the ADC1 has rack-mount holes that are machined to conform to standard rack mount dimensions. The width of the ADC1 panel is exactly ½ that of a standard 19” panel. The ADC1 is one rack unit high....
Page 17 - UltraLockTM ... What is It?
ADC1 Instruction Manual Page 17 UltraLock™ … What is It? Accurate 24-bit audio conversion requires a very low-jitter conversion clock. Jitter can very easily turn a 24-bit converter into a 16-bit converter (or worse). There is no point in buying a 24-bit converter if clock jitter has not been adequa...
Page 20 - Performance; Frequency Response
ADC1 Instruction Manual Page 20 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. The bass response extends well below the 10-Hz lim...
Page 21 - Inter-Channel Phase Response
ADC1 Instruction Manual Page 21 Inter-Channel Phase Response This graph shows that the differential phase is significantly better than ± 0.25º from 10 Hz to 20 kHz.
Page 26 - Specifications; Analog Audio Inputs; Worldclock Reference Output
ADC1 Instruction Manual Page 26 Specifications Analog Audio Inputs Number of Inputs (balanced) 2 Connector Gold-Pin Neutrik™ female XLR Impedance 200 k Ω Sensitivity -14dBu to +29 dBu (at 0 dBFS) Clock Reference Input Format Auto-detect AES/EBU, Word Clock, and Super Clock (256x) Impedance 75 Ω Sens...
Page 27 - Digital Audio Outputs
ADC1 Instruction Manual Page 27 Digital Audio Outputs Number of Digital Outputs 1 XLR Main 1 TOSLINK Main 1 BNC Main 1 BNC Aux Connectors Gold-Pin Neutrik™ male XLR Number of Audio Channels 2 Main Output Word Length 24 bits Main Output Sample Frequencies 44.1, 48, 88.2, 176.4, or 192 kHz Aux Output ...
Page 28 - Audio Performance
ADC1 Instruction Manual Page 28 Audio Performance Fs = 44.1 to 192 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted) SNR – A-Weighted, 0 dBFS = +8 to +29 dBu 121 dB SNR – Unweighted, 0 dBFS = +8 to +29 dBu 119 dB SNR – A-Weighted at max gain, 0 dBFS = -14 dBu 108 dB THD+N, 1 kHz...
Page 29 - LED Status Indicators
ADC1 Instruction Manual Page 29 Jitter Tolerance (With no Measurable Change in Performance) >12.75 UI sine, 100 Hz to 10 kHz > 3.5 UI sine at 20 kHz > 1.2 UI sine at 40 kHz > 0.4 UI sine at 80 kHz > 0.29 UI sine at 90 kHz > 0.25 UI sine above 160 kHz Maximum Amplitude of Jitter Ind...
Page 30 - AC Power Requirements
ADC1 Instruction Manual Page 30 AC Power Requirements Input Operating Voltage Range (VAC RMS) 110 V setting – 95 V min, 140 V max 220 V setting – 190 V min, 285 V max Frequency 50-60 Hz Power 16 Watts Idle 16 Watts Typical Program 20 Watts Maximum Fuses 5 x 20 mm (2 required) 110 V setting – 0.5 A 2...
Page 32 - Warranty Information; Benchmark 1 Year Warranty; The Benchmark 1 Year Warranty
ADC1 Instruction Manual Page 32 Warranty Information Benchmark 1 Year Warranty The Benchmark 1 Year Warranty Benchmark Media Systems, Inc. warrants its products to be free from defects in material and workmanship under normal use and service for a period of one (1) year from the date of delivery. Th...
Page 33 - Benchmark Extended Warranty; The Benchmark Extended 5* Year Warranty; International Warranty; Notes on Warranty Repairs
ADC1 Instruction Manual Page 33 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 origin...
