Benchmark ADC1 USB Manuale utente

Benchmark ADC1 USB

Instruction Manual

2-Channel 24-bit 192-kHz

Audio Analog-to-Digital Converter

ADC1 USB Instruction Manual – Rev C Page 2

Contents

Overview 3

Features

Front Panel Descriptions 6

1) Mode Switch 6

2) Mode Display 7

3) Meter Switch 9

4) Meter Display 9

5) First-Stage Gai Switch 10

6) Seco d-Stage Gai Switch 10

7) Seco d-Stage Gai Dial 10

8) Seco d-Stage Calibratio Trimmer 10

Back Panel Descriptions 11

1) Bala ced A alog Li e I puts 12

2) Aux BNC Output 12

3) Mai BNC Output 12

4) TOSLINK Optical Output 13

5) AES/EBU XLR Output 13

6) Clock Refere ce I put 13

7) Word Clock Refere ce Output 14

8) Fuse Holder 14

9) AC Power E try Co ector 14

10) USB Computer I terface Output 14

Rack Mounting 1

Rack Mou t Coupler 15

Bla k Rack Pa el 15

Performance 16

Freque cy Respo se 16

I ter-Cha el Phase Respo se 17

THD+N vs. Level, 1 KHz 18

32K B-H FFT, Idle Cha el Noise 19

32K B-H FFT, -3 dBFS, 1 KHz 20

32K B-H FFT, -3 dBFS, 10 KHz 21

Specifications 22

A alog Audio I puts 22

Clock Refere ce I put 22

Word Clock Refere ce Output 22

Digital Audio Outputs 23

Audio Performa ce 24

Group Delay (Late cy) 25

LED Status I dicators 25

AC Power Requireme ts 26

Dime sio s 26

Weight 26

ADAT S/MUX 27

UltraLock™ … What Is It? 28

Regulatory Compliance 31

CE Certificate of Co formity 31

RoHS Complia ce 32

Warranty Information 32

1 Year Warra ty 32

Exte ded 5 Year Warra ty 32

Exte ded 2 Year I ter atio al Warra ty 33

Warra ty Repair Procedure 33

ADC1 USB Instruction Manual – Rev C Page 3

Overview

The ADC1 USB is a refere ce-quality, 2-

cha el, 192-kHz, 24-bit, a alog-to-digital

co verter featuri g Be chmark's Adva ced

USB Audio™ tech ology, phase-accurate

UltraLock™ clock system with multi-fu ctio

clock i put a d word clock output, a d

Be chmark’s 9-segme t dual-ra ge digital

LED meteri g. The ADC1 USB is desig ed for

maximum tra spare cy a d is well suited for

the most dema di g applicatio s i studios

a d masteri g facilities. A rugged a d

compact half-wide 1 RU e closure also makes

the ADC1 USB a excelle t choice for locatio

recordi g, broadcast facilities, a d mobile

rigs. The i ter al power supply supports all

i ter atio al voltages a d has ge erous

margi s for over a d u der voltage

co ditio s.

The ADC1 USB achieves outsta di g

performa ce over a wide ra ge of i put

levels. Each cha el has a 41-dete t variable

gai co trol, a 10-tur gai calibratio

trimmer, a d a 3-positio first-stage gai

switch (0, 10, a d 20 dB). The gai

calibratio co trols may be used to calibrate

the ADC1 USB to precise studio refere ce

levels. The variable gai co trols may be used

to optimize the gai -stagi g betwee a

micropho e preamplifier a d the ADC1 USB.

Both the pot a d the trimmer have a 24 dB

adjustme t ra ge. I combi atio with the

first-stage gai switch, these co trols provide

exceptio al SNR a d THD+N performa ce

over a 44 dB adjustme t ra ge. Each cha el

has a two-positio toggle switch that selects

betwee the variable a d calibrated gai

co trol.

The ADC1 USB has a total of 5 stereo digital

outputs (1 XLR, 2 coaxial, 1 optical a d 1

USB). The digital outputs ca operate

simulta eously at up to three i depe de t

sample rates. The auxiliary coaxial output

ca be co figured for 16-bit TPDF dithered

output. This u ique flexibility e ables

simulta eous recordi g to a CDR, a high-

resolutio digital recorder, a d a high

resolutio DAW. For example the CDR may

operate at 44.1/16, while the DAW operates

at 88.2/24, while the digital recorder operates

at 192/24. The optical output supports AES

or ADAT formats at resolutio s up to 192/24.

I ADAT mode, high sample rates are

supported usi g SMUX2 a d SMUX4. Backup

a d/or demo recordi gs ca be created with

ease while high-resolutio outputs are fed to

primary recordi g devices.

The ADC1 USB has a BNC Word Clock output

that follows the sample rate of the Mai

Outputs. Word Clock output is active i all

modes of operatio .

A multi-format clock-i put automatically

recog izes AES/EBU, SPDIF, Word Clock, or

Super Clock sig als. This clock i put is used

to sy chro ize the Mai Outputs. If desired,

the Mai Outputs may be drive from i ter al

sources. The ADC1 USB will automatically

revert to a i ter al clock source whe the

exter al clock is lost.

The ADC1 USB has two clock modes: Exter al

(Ext) a d I ter al. Both modes support 44.1,

48, 88.2, 96, 176.4 a d 192 kHz.

The Ext mode allows the ADC1 USB to lock to

a exter al clock refere ce. I Ext mode, the

ADC1 USB will follow cha ges i sample rate,

a d/or cha ges i the type of refere ce sig al

(AES, SPDIF, word clock, or super clock).

Whe a clock refere ce is ot available, the

i ter al mode must be used, a d a sample-

rate must be selected (44.1, 48, 88.2, 96,

176.4, or 192 kHz). Whe the I ter al mode

is active, the ADC1 USB is acti g as clock

master, operati g at the selected sample

rate, a d a y sig al at the clock refere ce

i put will be ig ored. If i ter al mode is used,

all devices co ected to the ADC1 USB digital

outputs will eed to be co figured to lock to

the ADC1 USB. The clock output o the back

of the ADC1 USB ca be used if the co ected

device(s) require word clock.

The Be chmark UltraLock™ system is 100%

jitter immu e. The A/D co versio clock is

totally isolated from the AES/EBU, SPDIF,

ADAT, WC, a d super clock i terfaces. This

ADC1 USB Instruction Manual – Rev C Page 4

topology outperforms two-stage PLL desig s.

I fact, o jitter-i duced artifacts ca be

detected usi g a Audio Precisio System 2

Cascade test set. Measureme t limits i clude

detectio of artifacts as low as -140 dBFS,

applicatio of jitter amplitudes as high as

12.75 u it i tervals (UI) a d applicatio of

jitter over a freque cy ra ge of 2 Hz to 200

kHz. A poor-quality refere ce clock will ot

degrade the jitter performa ce of the ADC1

USB. I additio , the AES/EBU receiver IC

used for AES clock refere ce has bee

selected for its ability to decode sig als i the

prese ce of very high levels of jitter. The

Be chmark UltraLock system delivers

co siste t performa ce u der all operati g

co ditio s.

The ADC1 USB is desig ed to perform

gracefully i the prese ce of errors a d

i terruptio s at the clock refere ce i put. The

ADC1 USB will eve lock to a AES/EBU

sig al that has its sample-rate bit status set

i correctly si ce the sample rate is

determi ed by measuri g the i comi g

sig al. Lack of sample-rate status bits or

i correctly set status bits will ot cause loss

of audio.

The ADC1 USB is phase-accurate betwee

cha els a d betwee other ADC1 boxes

whe locked to AES/EBU or word clock

refere ce sig als. The word clock output from

o e ADC1 USB may be co ected to the clock

i put o a other ADC1 USB to expa d the

umber of phase-accurate co versio

cha els.

ADC1 USB Instruction Manual – Rev C Page 5

Features

• Two cha els of a alog-to-digital co versio

• Two XLR bala ced a alog i puts providi g high-performa ce over a 44 dB ra ge

• -15 dBu to +29 dBu i put se sitivity ra ge (at 0 dBFS)

• First-stage gai switches (1 per cha el): 0 dB, 10 dB a d 20 dB

• 41-dete t variable gai co trols (1 per cha el) with a 24 dB gai ra ge

• 10-tur gai calibratio co trols (1 per cha el) with a 24 dB gai ra ge

• 9-segme t dual-ra ge digital LED meters

• Sample rate LED i dicators for ‘Mai ’ a d ‘Aux’ digital outputs

• Sample rate for USB output is determi ed by computer (D.A.W./software)

• Co versio at 44.1, 48, 88.2, 96, 176.4, a d 192 kHz

• USB output resolutio 24 bits at 44.1, 48, 88.2, or 96 kHz

• Versatile exter al a d i ter al clock modes

• Multifu ctio clock i put with auto-recog itio of AES, SPDIF, Word Clock, or Super Clock

• Word Clock output

• Total jitter immu ity with Be chmark’s, phase-accurate UltraLock™ tech ology

• Simulta eous output of up to three differe t sample rates

• Simulta eous dithered 16 a d 24-bit outputs

• Five digital outputs (1 XLR, 2 Coax, 1 Optical, 1 USB)

• AES/EBU, ADAT, a d ADAT S/MUX2, a d ADAT S/MUX4 output formats

• THD+N = -104 dB, 0.00063% @ -3 dBFS i put, SNR 121 dB A-weighted

• Reliable a d co siste t performa ce u der all operati g co ditio s

• I ter al 115 V, 230 V, 50-60 Hz i ter atio al power supply with very wide operati g ra ge

• Low radiatio toroidal power tra sformer sig ifica tly reduces hum a d li e i terfere ce

• Meets FCC Class B a d CE emissio s requireme ts

ADC1 USB Instruction Manual – Rev C Page 6

Front Panel Descriptions

1) Mode Switch

The Mode Switch is a o -locki g toggle

switch which co trols the co versio modes

of the ADC1 USB.

Mode Switch Operation

The ADC1 USB ca be programmed to

fu ctio i a variety of co versio modes,

i cludi g simulta eous multiple sample rates,

bit depths, a d output formats usi g i ter al

a d/or exter al clock sources.

The USB output sample rate is always

co trolled by the computer with which it is

operati g. This is typically set i the

recordi g software (DAW), but it is

sometimes set withi the audio-utility co trol

pa el of the operati g systems (e.g.

‘AudioMIDI Setup’ i Mac OS X).

The co versio modes of the other four

outputs (XLR, optical, mai coax, a d

auxiliary coax) are set with the Mode Switch

by usi g press-a d-release or press-a d-hold

actio s. These fu ctio s are described i the

“Co versio Mode Programmi g” sectio .

Conversion Mode Programming

• Press-a d-release the Mode Switch up

to cycle through the clock source a d

sample rate optio s for the Mai

Outputs.

• Press-a d-release the Mode Switch

dow to cycle through the sample rate

a d bit depth optio s for the Aux

Output.

• Press-a d-hold the Mode Switch dow

for approximately 3 seco ds to switch

the optical output mode betwee

AES/EBU a d ADAT.

• Press-a d-hold the Mode Switch up for

approximately 3 seco ds to reset the

ADC1 USB to Factory Default setti gs.

Factory Default Settings

The ADC1 USB ca be easily reset to factory

default setti gs by pressi g a d holdi g the

Mode Switch up for approximately 3 seco ds.

The factory default setti g sy cs the mai

a d aux outputs to the exter al clock a d

co figures the optical output i AES/EBU

format.

ADC1 USB Instruction Manual – Rev C Page

2) Mode Display

The Mode Display i dicates the clock source,

sample rate, Aux output mode, a d optical

mode (ADAT, etc).

The Mode Display i dicates the operati g

mode of the digital XLR, optical, a d coax

outputs. It does ot display the sample rate

of the USB output. The USB sample rate is

set withi the software of the host computer.

Output Programming

The Mai Outputs ca be set to operate at a

fixed sample rate usi g the i ter al clock

source or they ca be set to follow a d lock to

a exter al clock source.

The Aux Output ca be set to typical DAT or

CD-writer resolutio s (TPDF-dithered; 16-bit;

44.1 or 48 kHz), or it ca be set to mirror the

Mai Output (bit-for-bit).

The Optical Output ca be set to AES/EBU

mode or ADAT mode.

The USB Output is sy chro ized to the

computer host. The sample-rate is

determi ed by the recordi g software.

External Clock Source ocking

The ADC1 USB ca sy c to a variety of

exter al clock sources, i cludi g Word Clock,

Super Clock, AES, a d SPDIF. O ce the ADC1

USB is locked to the exter al clock, it will

sy chro ize the Mai Outputs (a d Aux if

selected) to the sample rate of the Ext Ref

I put (exter al refere ce clock).

The bottom left LED i the Mode Display is

the Ext I dicator. If the Ext LED is off, the

the ADC1 USB is set to operate at a fixed

sample rate usi g the i ter al clock source.

If this LED is illumi ated the the ADC1 USB

is locked to a exter al clock source. Whe

locked, the Mode Display will i dicate the

sample rate.

If the refere ce sample rate is cha ged, the

ADC1 USB will automatically switch sample

rates to match the cha ge i the refere ce

sample rate. If the Ext LED is flashi g, the

ADC1 USB is set to sy c to a exter al clock

source a d is locki g to that source. The

ADC1 USB should lock i less tha 5 seco ds.

If a lock does ’t occur withi a 5 seco d

wi dow, there may be a problem with the

exter al refere ce clock. If a sy c error

occurs, verify a secure co ectio is prese t

betwee the ADC1 USB a d the exter al clock

source. The ADC1 USB is very tolera t of

low-level low-quality refere ce sig als.

External Clock Source

Synchronization

• Press up repeatedly o the Mode

Switch a d cycle through the Mai

Output modes u til the lower left Ext

LED is either o or flashi g.

Fixed Sample-Rate Conversion

The ADC1 USB ca be programmed to

co vert at a fixed sample rate usi g a

i ter al clock source. The followi g sample

rate freque cies are available: 44.1, 48, 88.2,

96, 176.4, a d 192 kHz. The Ext Ref I put is

ig ored whe the i ter al clock source is

selected.

Off = I ter al Sy c

O = Locked to Exter al Sy c

Flashi g = Exter al Sy c is

Selected, Not Locked

ADC1 USB Instruction Manual – Rev C Page 8

Setting the Fixed Sample Rate on

the Main Outputs

• Press-a d-release the Mode Switch up

repeatedly to cycle through the

available sample rates. The four LED's

i the upper left of the Mode Display

i dicate the sample rate, as illustrated

i the diagrams below.

Black = Lit

White = Not Lit

Gray = Irrelevant

44.1kHz 48 kHz 88.2 kHz

96 kHz 176.4 kHz 192 kHz

Sample Rate Display

Main Output

Colum o e of the Mode Display has a ‘48’

LED a d a ‘44’ LED. These i dicate sample

rates of 48 kHz a d 44.1 kHz respectively.

Colum two has a ‘x4’ LED a d a ‘x2’ LED.

These i dicate 4x or 2x multipliers. Multiply

the sample rate show i colum o e by the

multiplier show i colum two. For example,

if the ‘44’ a d ‘x2’ LED's are o , the sample

rate is 88.2 kHz (44.1 x 2 = 88.2).

Aux Output

The Aux Output ca be programmed to mirror

the Mai Outputs (bit for bit), or it ca

provide a lower-resolutio copy of the

co verted sig al at a i depe de t sample

rate. Colum three of the Mode Display

displays the Aux Output mode setti g.

NOTE: The Aux Output setti g does ot affect

the Mai Outputs i a y way.

Aux Output Programming

Press-a d-release the Mode Switch repeatedly

to cycle through the Aux Output mode

setti gs. The right-ha d colum of LED’s i

the Mode Display i dicates the Aux Output

mode as illustrated i the followi g diagram:

Exact Copy of

Mai Outputs

(24 bit)

44.1 kHz

16 bit

Dithered

48 kHz

16 bit

Dithered

ADAT or AES/EBU Selection for

the Optical Output

The Optical Output (o e of the three Mai

Outputs) ca provide either AES/EBU or ADAT

format. The AES/EBU mode works with most

S/PDIF optical i puts.

Press a d hold the Mode Switch dow to

cha ge the Optical Output mode. The

bottom-ce ter LED i dicates the optical mode

as illustrated i the followi g diagram:

Off = AES/EBU o Optical

Output

O = ADAT o Optical Output

Whe ADAT is active, S/MUX is automatically

e abled at all 2X a d 4X sample rates (88.2

kHz, 96 kHz, 176.4 kHz, a d 192 kHz).

ADC1 USB Instruction Manual – Rev C Page 9

3) Meter Switch

The Meter Switch selects the scale a d mode

of the 9-segme t LED Meter Display.

Meter Scale and Peak Hold

Function Selection

• Set the Meter Switch to “H” (top) to

e able the Peak Hold fu ctio a d set

the scale to a 1 dB step.

• Set the Meter Switch to “1” (ce ter) to

disable the Peak Hold fu ctio a d set

the scale to 1 dB step.

• Set the Meter Switch to “6” (dow ) to

disable the Peak Hold fu ctio a d set

the scale to a 6 dB step.

4) Meter Display

The ADC1 USB is equipped with a multi-

fu ctio 9-segme t LED meter. The Meter

Switch selects either a 6 dB step or 1 dB step

scale a d co trols the peak-hold fu ctio .

Meteri g is fully digital a d post-co versio

for absolute accuracy. The u its are dBFS (dB

below the level of a full-scale si e wave, or

more simply, dB below digital clip).

Time co sta ts are built i to the meters so all

tra sie t peaks ca be observed easily. If a

tra sie t peak has a duratio as short as o e

digital sample, a LED will be illumi ated a d

remai illumi ated lo g e ough to be

observed by the huma eye.

A peak i dicatio mimics the actio of the

eedle o a peak-readi g a alog meter, while

the remai i g LED's will follow the

i sta ta eous level of the audio.

The red 0 LED i dicates that a full-scale

digital code has bee reached a d that digital

clippi g has occurred. Full-scale eve ts as

short as o e digital sample, will light the 0

LED. Short si gle-sample digital clippi g

eve ts are ofte audible, a d all 0 dBFS

eve ts should be avoided.

The ADC1 USB has a very large dy amic

ra ge (especially whe operati g at 24-bit

output word le gths). It is wise to use some

of this dy amic ra ge to provide more

headroom as i sura ce agai st clippi g.

Leave some extra headroom betwee your

highest a ticipated peak a d the red 0 dBFS

LED.

Input Gain Adjustment

Each cha el o the ADC1 USB is equipped

with a 3-positio first-stage gai switch. The

first gai -stage provides exceptio al oise

performa ce at gai s of 0 dB, +10 dB, or +20

dB. This stage is followed by a seco d-stage

havi g a co ti uously variable gai ra ge of

-5 dB to +19 dB. This gai structure provides

ultra-high performa ce at a y gai setti g

betwee -5 dB a d +39 dB. The higher gai

setti gs will allow direct co ectio s from

ma y electro ic i strume ts a d i strume ts

with pickups ( o DI box required).

At a gai setti g of 0 dB, the co verter will

reach full-scale (0 dBFS) with a +24 dBu

i put level. The calibrated gai trim-pots are

factory calibrated for 0 dB seco d-stage gai .

ADC1 USB Instruction Manual – Rev C Page 10

) First-Stage Gain Switch

Input Gain Stages

The First-Stage Gai Switches ca apply

a alog gai (0, 10, or 20 dB) to the left

a d/or right cha el. Both cha els have

their ow dedicated switches. The First-Stage

Gai ca be used i ‘Calibrated’ or ‘Variable’

mode.

To select the first-stage gain

• Set the switch to “0” (ce ter) to select

0 dB (u ity) gai for the first-stage.

• Set the switch to “10” (dow ) to select

10 dB gai for the first-stage.

• Set the switch to “20” (up) to select 20

dB gai for the first-stage.

6) Second-Stage Gain Switch

The Seco d-Stage Gai Switch determi es

the type of seco d-stage gai co trol. The

switches (o e for each cha el) ca be set to

either ‘Variable’ or ‘Calibrated’. Whe the

switch is set to ‘Variable’, the seco d-stage

gai for that respective cha el is determi ed

by the Seco d-Stage Gai K ob. Co versely,

whe the switch is set to ‘Calibrated’, the

Seco d-Stage Calibratio Trimmer adjusts the

gai for fi ely-tu ed, calibrated operatio .

7) Second-Stage Gain Dial

The Seco d-Stage Gai Dial is a 41-dete t

gai co trol with a usable ra ge of

approximately -5 dB to +19 dB. I order to

use this gai co trol for a cha el, that

cha el’s respective Seco d-Stage Gai

Switch must be set to Variable (up).

8) Second-Stage Calibration

Trimmer

The Seco d-Stage Calibratio Trimmers are

10-tur gai trim pots with a useable ra ge of

approximately -5 dB to +19 dB. I order to

use the trim pots the Seco d-Stage Gai

Switch must be set to Calibrated (dow ).

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