Product ManualManual

The 7720DAC-A4 is a high-quality, 24-bit, digital to analog audio converter which converts 2 AES/EBU digital signals to 4 balanced analog audio signals. The 7720DAC-A4 has two independent AES/EBU converters. The inputs sample rate supported are 44.1 KHz and 48KHz. All analog audio outputs levels may be set individually from the front panel.

Level control is provided via a card edge toggle and the set gain level can be read out from a card edge display for convenience. The full scale digital signal can be calibrated to accommodate peak levels ranging of 12dBu to 25dBu with 0.1dB resolution.

The audio DAC features a card edge VU meter for quick confidence monitoring. Four separate level indicators are provided via bargraphs for quick validation of audio program material.

Features
  • AES3/IEC-958 or AES-3id/SMPTE276/S/PDIF
  • 24-bit, high-quality conversion
  • 44.1 and 48KHz sampling rate
  • 0dBFS programmable from 12dBu to 25dBu
  • Support for 4 channels of balanced analog audio (2 AES/EBU)
  • Clock recovery via VCXO for extra stable sample clock generation
  • A card edge display provides a 4 channel bar graph type level indicator display for confidence monitoring
  • Local card edge display for level setup
  • Drives directly 600Ω loads
  • VistaLINK® capable for remote monitoring, control and configuration capabilities via SNMP; using VistaLINK® PRO, CP-2116E or CP-2232E Control Panels. VistaLINK® is available when modules are used with the 3RU 7800FR frame and a 7800FC VistaLINK® Frame Controller module in slot 1 of the frame

Download Datasheet

Specifications

Unbalanced AES Audio Inputs7720DAC-A4
Number of Inputs2
StandardSMPTE ST 276M, unbalanced AES
ConnectorsBNC per IEC 169-8
Signal Level0.1 to 2.5V p-p
Equalization> 1000m @ 48kHz with 1V p-p drive and Belden 8281 or equivalent coax cable
Resolution24-bit
Sample Rate44.1, 48kHz, ±100ppm (all other rates between 42 – 50kHz will remain audible but somewhat distorted)
Input Impedance75Ω, AC-coupled
Return Loss< 25dB, 0.1 – 6.0MHz
BNC GroundingAC-coupled (for 60Hz ground loop current protection)
Balanced AES Audio Inputs7720DAC-A4-B
Number of Inputs2
StandardAES3-1992, balanced AES
Connectors3-pin removable terminal strip
Signal Level0.2 to 10V p-p
Equalization> 400m @ 48kHz with 2 – 10V p-p drive and Belden 1800B or equiv. shielded twisted pair cable
Resolution24-bit
Sample Rate44.1, 48kHz, ±100ppm (all other rates between 42 – 50kHz will remain audible but somewhat distorted)
Input Impedance110Ω ±10%, transformer coupled
Shield GroundingAC-coupled (for 60Hz ground loop current protection)
Analog Audio Output
Number of Outputs4
TypeBalanced analog audio
Connectors2x 6-pin removable terminal strip
Output Impedance66Ω
Signal Level0dB FS ⇒ 12-25dBu into 10kΩ load (user configurable)
0dB FS ⇒ 12-24dBu into 600Ω load
Frequency Response< ±0.05dB (20Hz to 20kHz)
Dynamic Range24-bit
THD+N< -100dB RMS @ 20Hz to 20kHz, with 24dBu output, unweighted
SNR> 110dB RMS (20Hz to 20kHz), unweighted
Crosstalk Isolation> 110dB RMS (20Hz to 20kHz), unweighted
Inter-Channel Phase Error< ±1°(20Hz to 20kHz)
Digital to Analog Delay0.95m sec
Electrical
Voltage+12V DC
Power12 watts
EMI/RFIComplies with FCC Part 15, Class A, EU EMC directive
Physical
Number of Slots2

Ordering Information

7720DAC-A4Dual AES to Quad Analog Audio Converter with unbalanced AES inputs
7720DAC-A4-BDual AES to Quad Analog Audio Converter with balanced AES inputs
Ordering Options
NotesRear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+SAStandalone Enclosure Rear Plate
+3RU3RU rear plate for use with 350FR, 7700FR-C, 7800FR or 7801FR Multiframes
Enclosures
350FRPortable Multiframe which holds 7 single slot modules
7700FR-C3RU Multiframe which holds 15 single slot modules
7800FR3RU Multiframe which holds 15 single slot modules
7801FR1RU Multiframe which holds 4 single slot modules
S7701FR7700 Series Standalone Enclosure
Accessories
7800FCVistaLINK® Frame Controller
CP-2116E-HRemote Control Panel
CP-2232ERemote Control Panel