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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

Specifications

Unbalanced AES Audio Inputs

7720DAC-A4
Number of Inputs 2
Standard SMPTE ST 276M, unbalanced AES
Connectors BNC per IEC 169-8
Signal Level 0.1 to 2.5V p-p
Equalization > 1000m @ 48kHz with 1V p-p drive and Belden 8281 or equivalent coax cable
Resolution 24-bit
Sample Rate 44.1, 48kHz, ±100ppm (all other rates between 42 – 50kHz will remain audible but somewhat distorted)
Input Impedance 75Ω, AC-coupled
Return Loss < 25dB, 0.1 – 6.0MHz
BNC Grounding AC-coupled (for 60Hz ground loop current protection)

Balanced AES Audio Inputs

7720DAC-A4-B
Number of Inputs 2
Standard AES3-1992, balanced AES
Connectors 3-pin removable terminal strip
Signal Level 0.2 to 10V p-p
Equalization > 400m @ 48kHz with 2 – 10V p-p drive and Belden 1800B or equiv. shielded twisted pair cable
Resolution 24-bit
Sample Rate 44.1, 48kHz, ±100ppm (all other rates between 42 – 50kHz will remain audible but somewhat distorted)
Input Impedance 110Ω ±10%, transformer coupled
Shield Grounding AC-coupled (for 60Hz ground loop current protection)

Analog Audio Output

Number of Outputs 4
Type Balanced analog audio
Connectors 2x 6-pin removable terminal strip
Output Impedance 66Ω
Signal Level 0dB FS ⇒ 12-25dBu into 10kΩ load (user configurable)
0dB FS ⇒ 12-24dBu into 600Ω load
Frequency Response < ±0.05dB (20Hz to 20kHz)
Dynamic Range 24-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 Delay 0.95m sec

Electrical

Voltage +12V DC
Power 12 watts
EMI/RFI Complies with FCC Part 15, Class A, EU EMC directive

Physical

Number of Slots 2

Ordering Information

7720DAC‑A4 Dual AES to Quad Analog Audio Converter with unbalanced AES inputs
7720DAC‑A4‑B Dual AES to Quad Analog Audio Converter with balanced AES inputs

Ordering Options

Notes Rear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+SA Standalone Enclosure Rear Plate
+3RU 3RU rear plate for use with 350FR, 7700FR-C, 7800FR or 7801FR Multiframes

Enclosures

350FR Portable Multiframe which holds 7 single slot modules
7700FR-C 3RU Multiframe which holds 15 single slot modules
7800FR 3RU Multiframe which holds 15 single slot modules
7801FR 1RU Multiframe which holds 4 single slot modules
S7701FR 7700 Series Standalone Enclosure

Accessories

7800FC VistaLINK® Frame Controller
CP-2116E-H Remote Control Panel
CP-2232E Remote Control Panel