Product ManualManual

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

Download Datasheet


Analog Audio Input
TypeBalanced analog audio
Number of Inputs4
ConnectorRemovable terminal strip
Impedance10kΩ minimum (differential)
Sampling Rate48KHz (freerun or locked to the reference)
Signal Level0dB 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
SNR100dB 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
StandardNTSC (SMPTE ST 170), PAL (ITU624-4), DARS
Number of Inputs1
ConnectorBNC per IEC 61169-8 Annex A
Signal Level
Max2V p-p video (composite only)
MinSync level 150m (composite only)
DARSSMPTE ST 276, 1V p-p
Frequency Lock Range±100ppm from nominal
ImpedanceHigh Impedance
Return Loss> 25dB to 10MHz (with external 75Ω termination)
AES Audio Output
StandardSMPTE ST 276 single ended AES
Number of Outputs2
ConnectorBNC per IEC 61169-8 Annex A
Sampling Rate48KHz
Impedance75Ω unbalanced
Resolution24 bits
Input/Output Delay0.87ms
Voltage+12V DC
Power10 Watts (nominal)
EMI/RFIComplies with FCC Part 15 Class A, EU EMC Directive
Number of Slots1

Ordering Information

7720ADC-A4Quad Analog Audio to Dual AES Converter
7720ADC-A4-BQuad Analog Audio to Dual Balanced AES Converter
Ordering Options
NotesRear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+1RU1RU rear plate for use with 7701FR Multiframe
+SAStandalone Enclosure Rear Plate
+3RU3RU rear plate for use with 350FR, 7700FR-C or 7800FR Multiframes
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
7701FR1RU Multiframe which holds 3 single slot modules
S7701FR7700 Series Standalone Enclosure
7800FCVistaLINK® Frame Controller
CP-2116E-HSystem Control Panel, One Touchscreen LCD and 16 LCD Buttons
CP-2232ESystem Control Panel, 2RU, Two Touchscreen LCDs and 32 LCD Buttons