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7720DAC-A4 & 7720DAC-A4-B

Dual AES to Quad Analog Audio Converter with Unbalanced/Balanced AES Inputs

Product ManualManual
  • VistaLINK® enabled

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
Block DiagramBlock Diagram

Specifications

Analog Audio Input
Number of Inputs4
TypeBalanced analog audio
ConnectorRemovable terminal strip
Input Impedance10kΩ minimum (differential)
Sampling Frequency48kHz (freerun or locked to the reference)
Signal Level0dB FS = 8dBu to 27dBu (programmable via 0dB/+6dB jumper and card edge fine gain with -10dB +10dB range)
Frequency Response±0.1dB (20Hz to 20kHz)
SNR100dB with input at -1dB FS
THD+N< 0.001% (> 100dB) @ 20Hz to 20kHz, -1dB FS
CMRR> 100dB @ 1kHz
Crosstalk< -100dB @ 20Hz-20kHz
Inter-channel Phase Error< 1°, 20Hz-20kHz
Reference Input
StandardNTSC (SMPTE ST 170), PAL (ITU624-4), DARS
Number of Inputs1
ConnectorBNC per IEC 61169-8 Annex A
Signal Level
Video
Maximum2V p-p video (composite only)
MinimumSync level 150m (composite only)
DARSSMPTE 276M, 1V p-p
Frequency Lock Range±100ppm from nominal
Input ImpedanceHigh impedance
Return Loss> 25dB to 10MHz (with external 75Ω termination)
AES Audio Output
StandardSMPTE 276M single ended AES
Number of Outputs2
ConnectorsBNC per IEC 61169-8 Annex A
Resolution24-bits
Sampling Rate48kHz
Impedance75Ω unbalanced
I/O Delay0.87ms
Electrical
Voltage+12V DC
Power10 watts (nominal)
EMI/RFIComplies with FCC Part 15, Class A
EU EMC Directive
Physical
Number of Slots1

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