Sonifex RB-ADDA2 - Combined A/D and D/A Converter (24 bit, 192kHz Capable) (1U)

Sonifex RB-ADDA2

The Sonifex RB-ADDA2 A/D and D/A converter is a 1U rack-mount which produces an AES/EBU, S/PDIF or TOSlink optical level digital audio output from a balanced XLR or unbalanced phono stereo audio input. It also produces a stereo balanced XLR or unbalanced phono output from an incoming AES/EBU, S/PDIF or TOSlink optical digital input signal.

The RB-ADDA2 is a high performance, enhanced version of the RB-ADDA providing the following additional features:

• It supports higher sample frequency rates up to and including 176.4kHz and 192kHz.
• It has additional independent AES/EBU and Word Clock synchronising inputs, so that the A/D and D/A sections can operate independently, with the digital outputs synchronised to an external master reference clock.
• It has TOSlink optical digital audio input and output.
• It has front panel push-button switches for all the main settings. The buttons are arranged in sets, where pressing the button advances the current selection and LED indicator.
• A serial RS232 port is included so that the RB-ADDA2 settings can be controlled remotely. The front panel LED indicators alter automatically when using RS232 commands.

The A/D SOURCE push-button is used to select from either the balanced or unbalanced stereo analogue inputs and this push-button also defines the input level for full scale digits at one of +12dBFS, +18dBFS or +24dBFS. These values can then be fine-tuned by using rear-panel pre-set potentiometers which give another ±3dB of gain adjustment, allowing a signal range from +9dBu to +27dBu. The RCA phono inputs have a further 10dB gain incorporated to give a total gain range of -1dBu to +17dBu for full-scale digits.

For the digital output, there are three push-button switches to select the sample frequency, bit depth and status bit modes. The FREQUENCY button allows selection of the master sample frequency from one of 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz. The BITS button sets the output bit depth as one of 16, 20 or 24 bits, and the CS DATA button defines the content of the channel status bits embedded within the digital audio stream. The status bits can be forced to either Professional Mode (PRO), Consumer Mode (CON) or to follow the mode of the input (FOLLOW).

The SYNC button is used to select the synchronisation input, from Word Clock, AES/EBU or the D/A input, and also the synchronisation mode of the digital output. The A/D section of the RB-ADDA2 operates in four selectable modes:

Master Mode
In this mode the unit receives an analogue audio signal, which is digitised and formatted for digital serial transmission (IEC958). The necessary clock signals are generated internally from an on board master clock at a selectable rate (32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz).

Slave Mode
In this mode the unit is synchronised to an external source, using the digital audio sync or D/A input signal from which the clock signals are stripped, or to the TTL level Word Clock. The FREQUENCY LED will indicate the synchronised sample frequency and if no sync is present, no output will be generated.

Auto Mode
Here, the unit is synchronised to an external source, using the digital audio sync or D/A input signal from which the clock signals are stripped, or to the TTL level Word Clock. If no sync signal is present the unit runs from the onboard master clock at a rate selected by the front panel control (32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz).

Auto Lock Mode
This operates like the auto mode except that if no sync signal is present the unit will run at the closest master clock rate to the last locked incoming signal. The FREQUENCY LED will indicate the synchronised sample frequency.

When operating in sync modes, the SYNC button flashes whenever the unit is not synchronised to the incoming digital signal. 

The D/A section has one SOURCE push-button which is used to select the digital input source from AES/EBU, S/PDIF or TOSlink optical and which also sets the analogue output level to be generated for full scale digits, from either +12dBFS, +18dBFS or +24dBFS. There are factory-set internal level controls for fine tuning the analogue output gain adjustment. If no digital audio source is present, the D/A SOURCE button flashes.

The RB-ADDA2 automatically decodes 50/15µs emphasis if this is indicated by certain channel status bits in the incoming digital audio data.

In both A/D and D/A sections, audio is sent to all of the outputs simultaneously. A red LED indicates when power to the RB-ADDA2 is on.

Sonifex RB-ADDA2 Specifications

Analogue To Digital Conversion

A/D Audio Specification

• Maximum Input Level: +27dBu balanced inputs, +17dBu unbalanced inputs
• Input Impedance: >10kΩ unbalanced, >20kΩ bridging balanced
• Dynamic Range: >110dB
• Gain Range: Adjustable input gain of ±3dB on selected +12dBu, +18dBu or +24dBu, ref FSD
• Distortion & Noise: >96dB THD + N at 1kHz   

A/D Connections

• Analogue Inputs:
  
  • 2 x XLR 3 pin (balanced)
  • 2 x RCA phono (unbalanced)
• Sync Inputs:
  
  • 1 x AES/EBU XLR 3 pin female 
  • 1 x TTL Word clock BNC
• Digital Outputs:
  
  • 1 x AES/EBU XLR 3 pin male
  • 1 x S/PDIF RCA phono
  • 1 x TOSlink optical
• Serial RS232: x 9 pin D-type plug
• Mains Input: Filtered IEC, continuously rated 85-264VAC @ 47-63Hz, 10W max
• Fuse Rating: Anti-surge fuse 1A 20 x 5mm   

A/D Operational Controls

• Analogue Input Source: Balanced XLR or unbalanced phono, via A/D SOURCE push-button 
• Analogue Input Level for FSD: +12dBFS, +18dBFS or +24dBFS, via A/D SOURCE push-button
• Analogue Input Level Adjust: +9dBu to +27dBu via rear-panel pre-set pots
• Sample Frequency Rates: 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz, via FREQUENCY push-button
• Bit Depth: 16, 20 or 24 bits, via BITS push-button
• Channel Status Bits: Consumer mode, professional mode or follow input, via CS DATA push-button
• Sync Input Select: AES/EBU, Word Clock or D/A input, via SYNC push-button
• Sync Mode Select: Master, slave, auto, auto lock, via SYNC push-button   

Digital to Analogue Conversion

D/A Audio Specification

• Maximum Output Level: +24dBu balanced output, +14dBu unbalanced output
• Output Impedance: <50Ω balanced, <75Ω unbalanced
• Dynamic Range: >110dB   

D/A Connections

• Digital Inputs:
  • 1 x AES/EBU XLR 3 pin female
  • 1 x S/PDIF RCA phono
  • 1 x TOSlink optical
• Analogue Outputs:
  
  • 2 x XLR 3 pin male (balanced)
  • 2 x RCA phono (unbalanced)    

D/A Operational Controls

• Digital Input Select: AES/EBU, S/PDIF or TOSlink optical, via push-button
• Analogue Output Level for FSD: Selectable +12dBu, +18dBu or +24dBu output level, ref FSD, via D/A SOURCE push-button      

Physical Specification

• Dimensions: 
  
  • 48cm (W) x 15.8cm (D*) x 4.2cm (H) (1U)
  • 19” (W) x 6.2” (D*) x 1.7” (H) (1U)
• Weight:
  
  • 1.6kg Gross: 2.3kg
  • 3.5lbs Gross: 5lbs