Aphex 141 User Manual

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I N T E R FACES

M O D E L 1 4 1 / 1 4 2 / 1 4 4

O W N E R ’ S G U I D E

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Model 141 ADAT to Analog Converter

INSTRUCTION-ANUAL

A MESSAGE FROM THE PRESIDENT

Safety Declarations

This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to

The user is cautioned that changes and modifications made to the equipment without approval of the manufacturer could

Model 142 Analog to ADAT Converter Model 144 AES/ADAT Bi-directional Converter

1.0 Introduction

The Aphex Models 141, 142 and 144 were developed as interfaces between the Aphex Anaconda digital snake system and other devices. Each model was designed to do its job without any extra

unnecessary bells or whistles. While they each fulll that design specication, each model is an

excellent, useful product in it own right.

Since the I/O of the Anaconda is ADAT, there is an ADAT connection in each model. The ADAT eight channel format has been a standard in the audio industry for years. It is a reliable, mature, cost effective technology albeit with limitations. The prime limitation is the distance that ADAT audio can

be safely transmitted through ‘Lightpipe’ ber. Some claim that it could be as far as 30 feet, but our experience shows that there can be signicant audible artifacts at 20 feet. We strongly recommend that the distance be as short as possible, preferably less than 10 feet (3 meters).

The other limitation is that its maximum sample rate is 48kHz for eight channel operation. There is a technology called S-Mux that doubles the maximum frequency but halves the channel count. We have elected to stay with the sample rate of 48kHz in the Model 142, but Models 141 and 144 can work at 44.1 or 48kHz.

There are many other products on the market that do similar functions. But none as simply or as well or as cost effectively, as these units. You will enjoy many years of excellent uninterrupted performance.

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Model 141 ADAT to Analog Converter Model 142 Analog to ADAT Converter Model 144 AES/ADAT Bi-directional Converter

2.0 Installation and Interfacing

Rack Installation

All three models are 1.75” high (1RU), 8.25” wide and 7.25” deep. They can be rack mounted by using the Aphex accessory # 44-008SA rack kit. One kit can be used to mount a pair of units or a single unit in 1RU. Follow the instructions included with the rack kit for assembly.

Make sure that there is sufcient airow around the units. Do not mount them directly on top of

equipment that generates excessive heat or near equipment that generates large magnetic hum

elds.

AC connections

All the models have internal power supplies that are preset to a specic operating voltage. Make sure

that the unit is set to the proper voltage for your area before connecting to AC power.

Audio connections

Analog audio connections in the Models 141 and 142 are through TASCAM analog standard 25 pin D-Sub. Both input on the Model 142 and output on the Model 141 are female D-Sub connectors on the chassis. D-Sub connections are as follows:

Balanced inputs

The analog audio input stages in the Model 142 are balanced. They can be driven by either a balanced or an unbalanced input. If unbalanced, connect the “Hot” to the “+” pin on the input connector. Connect ground to the “G” pin and “ - “ pin. Maximum input level, balanced or unbalanced is +24dBu.

Balanced outputs

The analog audio outputs of the Model 141 are impedance balanced. This is a true balanced circuit, however audio signals appear only on the “+” connector pins. If driving a balanced input connect the output pins “+” and “-” to the appropriate input connections. It is recommended that the ground be connected only at the receiving end. If driving an unbalanced input connect “+” to the “hot” input and connect “G” to the ground connection at the receiving end. You can leave the “-” unconnected or it can be tied to ground. Maximum output level is +24dBu.

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Owner’s Manual

Model 141 ADAT to Analog Converter Model 142 Analog to ADAT Converter Model 144 AES/ADAT Bi-directional Converter

ADAT connections

ADAT connections use a standard TOSLINK optical transmitter and receiver on the Model 144, a receiver on the Model 141 and a transmitter on the Model 142. Keep ADAT connections as short as possible.

AES connections

AES connections use Aphex standard 15 pin D-Sub. The AES output from the Model 144 is female and the AES input to the Model 144 is male. The connections are as follows:

Word clock

The Anaconda system is designed to work at 48kHz sampling frequency only. In order to achieve its unmatched performance, the clock must be within +/-5Hz of 48kHz. That is why the Anaconda has its own super stable and accurate clock generator and distribution system.

The Model 142 has a word clock input on a standard BNC with an internal 75Ω terminating resistor.

If there is no word clock connected, the clock will be approximately 48kHz, but not exactly. It is highly recommended that a 48kHz word clock be connected to the Model 142 even if the unit is not part of an Anaconda system.

The Model 141 needs no clock as it converts whatever is on the ADAT input to analog. It can accept

44.1kHz or 48kHz.

The Model 144 has no separate clock input. However, the same word clock (either 44.1kHz or 48kHz)

must be used for all the AES sources. Also, AES input channels 1 and 2 must be connected to the Model 144 in order for the clock to be derived for the ADAT output.

LED Indicators

Models 141 and 142 have a single bi-color red/green LED labeled “Power/Locked”. The LED will be red when power is supplied but without any ADAT connected to the Model 141 or word clock

connected to the Model 142. When there is a valid ADAT signal (either at 44.1kHz or 48kHz)

connection to the Model 141 the LED will turn green.

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Model 141 ADAT to Analog Converter Model 142 Analog to ADAT Converter Model 144 AES/ADAT Bi-directional Converter

When there is a valid word clock connection to the Model 142 (at 48 kHz only ), the LED will turn

green.There is a red LED next to each input trimmer on Model 142. It illuminates when the input signal exceeds +24dBu to indicate clipping on that channel.

There are three green LED’s on the Model 144. When power is applied the “Power” LED is lit.

When a valid ADAT signal is present (either at 44.1kHz or at 48kHz) the “ADAT LOCKED” LED is lit.

Wen

When there is AES input (there must be the connection to AES Channel 1,2 at either 44.1 or 48kHz)

the “AES LOCKED” LED is lit. If there are any red LED’s illuminated it indicates a problem somewhere in the system.

Note: The ADAT to AES circuit is completely independent from the AES to ADAT circuit.

Analog Audio Level

+24dBu is the maximum analog audio input level into the Model 142 and the maximum analog audio

output level from the Model 141. This level corresponds to 0dBfs (full scale) in the digital domain.

There is a trimmer for each analog audio input to the Model 142 that adjusts the gain by 12dB.If the

unit is being fed by a professional level device (0Vu = +4dBu) the gain trimmer should be set to “0”. If the Model 142 is being fed by a consumer level device (0Vu = -10dBV) the trimmer should be set to

“+12”.

There is a trimmer for each analog audio output of the Model 141 that adjusts the gain by 12 dB. If

the unit is feeding a professional level device (0Vu = + 4 dBu ) then the trimmer should be set to “ 0 “ .

If the Model 141 is feeding a consummer level device ( 0 Vu = - 10 dBV ) the trimmer should be set to “- 12“.

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Model 141 ADAT to Analog Converter Model 142 Analog to ADAT Converter Model 144 AES/ADAT Bi-directional Converter

3.0 specication

Specications

Model 141 142 144

Max Input 0dBfs +24dBu 0dBfs

Max Output +24dBu 0dBfs 0dBfs

THD+Noise -100dB -100dB N/A

Dynamic Range 114dB 114dB N/A

Trim Range 12dB 12dB N/A

Jitter <1nsec <1nsec <1nsec

Power Consumption 10 Watts

Frequency Response 20Hz 20kHz ±0.5dB N/A

Size 1RU 1/2 Rack Width 1.75”H x 8.25”W x 7.25”D

Weight 3.5lbs (1.6kg) (44.5mm x 209.5mm x 184.2mm)

Connectors Toslink Toslink Toslink (2)

25 Pin D-sub Tascam Format 25 Pin D-sub Tascam Format 15 Pin D-sub Aphex Format (2)

BNC Word Clock

All specications are subject to change without notice.

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Other brand and product names are Trademarks of their respective holders.

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Model 141 ADAT to Analog Converter

MODEL 141

8 CHANNEL

D TO A CONVERTER

APHEX SYSTEMS

AC LINE

10 WATTS

Model 142 Analog to ADAT Converter

AC LINE

10 WATTS

SUN VALLEY, CA

MADE IN USA

From ADAT source

MODEL 142

8 CHANNEL

A TO D CONVERTER

APHEX SYSTEMS

SUN VALLEY, CA

MADE IN USA

To ANALOG input

WORD

CLOCK

INPUT

ADAT

INPUT

ADAT

OUTPUT

ANALOG OUTPUTS

CH2

CH4 CH6

G CH1

CH3

CH5

ANALOG INPUTS

CH2

CH4 CH6

G CH1

CH3

CH5

CHAN

POS(+) NEG(-) GND

CH8

CH7

CH8

CH7

PIN 13 NC - NO CONNECTION

CHAN

POS(+) NEG(-) GND

PIN 13 NC - NO CONNECTION

From WORD CLOCK

source

To ADAT input

From ANALOG source

Model 144 AES/ADAT Bi-directional Converter

MODEL 144

APHEX SYSTEMS

AC LINE

10 WATTS

From ADAT source

SUN VALLEY, CA

MADE IN USA

ADAT TO AES AES TO ADAT

To AES input

ADAT

INPUT

AES OUTPUTS

CH7,8

CH5,6 CH3,4

G G G

CH1,2

From AES source *

* Channel 1,2 must

be connected

AES INPUTS

CH1,2

CH3,4 CH5,6

G G G

CH7,8

To ADAT input

ADAT

OUTPUT

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Aphex Systems Ltd.

USA

HANNEL

11068 Randall St.

Sun Valley CA 91352 , USA

Tel: (818) 767 - 2929 Fax: (818) 767- 2641

Web: www.aphex.com

Email: sales@aphex.com