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7720ADC‑A4 & 7720ADC‑A4‑B

Quad Analog Audio to Dual AES Converter and Balanced AES Converter

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The 7720ADC-A4 is a high-quality, 24-bit, analog to digital audio converter which provides digital conversion of 4 balanced analog audio channels and provides 2 unbalanced (or balanced from the 7720ADC-A4-B) AES/EBU channels out.

The sampling clock may free run at 48KHz or may be locked to either a DARS (Digital Audio Reference Signal) reference or composite video reference. Level control is provided via a card edge toggle switch. The input 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 from 8dBu to 27dBu with 0.5dB resolution.

The audio ADC 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.


  • Auto detect composite video or DARS on the reference input
  • 24-bit, high-quality analog to digital audio conversion
  • Support for 4 channels of analog audio (2 AES/EBU)
  • Local card edge display and control of input gain
  • 0dBFS programmable from 8dBu to 27dBu
  • Automatic DC removal
  • A card edge display provides a 4 channel bargraph type level indicator display for confidence monitoring
  • 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


Analog Audio Input

Type Balanced analog audio
Number of Inputs 4
Connector Removable terminal strip
Impedance 10kΩ minimum (differential)
Sampling Rate 48KHz (freerun or locked to the reference)
Signal Level 0dB FS =>8dBu to 27dBu (programmable via 0dB/+6dB jumper and card edge fine gain with -10dB to +10dB range)
Frequency Response < ±0.1dB, 20Hz to 20kHz
SNR 100dB with input at -1dB FS
THD+N < 0.001% (> 100dB) @ 20Hz to 20kHz, -1dB FS
CMRR > 100dB at 1kHz
Crosstalk < -100dB at 20Hz-20kHz
Interchannel Phase Error < 1°, 20Hz to 20kHz

Reference Video Input

Standard NTSC (SMPTE ST 170), PAL (ITU624-4), DARS
Number of Inputs 1
Connector BNC per IEC 61169-8 Annex A
Signal Level
Max 2V p-p video (composite only)
Min Sync level 150m (composite only)
DARS SMPTE ST 276, 1V p-p
Frequency Lock Range ±100ppm from nominal
Impedance High Impedance
Return Loss > 25dB to 10MHz (with external 75Ω termination)

AES Audio Output

Standard SMPTE ST 276 single ended AES
Number of Outputs 2
Connector BNC per IEC 61169-8 Annex A
Sampling Rate 48KHz
Impedance 75Ω unbalanced
Resolution 24 bits
Input/Output Delay 0.87ms


Voltage +12V DC
Power 10 Watts (nominal)
EMI/RFI Complies with FCC Part 15 Class A, EU EMC Directive


Number of Slots 1

Ordering Information

7720ADC‑A4 Quad Analog Audio to Dual AES Converter
7720ADC‑A4‑B Quad Analog Audio to Dual Balanced AES Converter

Ordering Options

Notes Rear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+1RU 1RU rear plate for use with 7701FR Multiframe
+SA Standalone Enclosure Rear Plate
+3RU 3RU rear plate for use with 350FR, 7700FR-C or 7800FR Multiframes


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
7701FR 1RU Multiframe which holds 3 single slot modules
S7701FR 7700 Series Standalone Enclosure


7800FC VistaLINK® Frame Controller
CP-2116E-H System Control Panel, One Touchscreen LCD and 16 LCD Buttons
CP-2232E System Control Panel, 2RU, Two Touchscreen LCDs and 32 LCD Buttons