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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.
Features
- 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
Specifications
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 | |
| Video | |
| 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 |
Electrical | |
|---|---|
| Voltage | +12V DC |
| Power | 10 Watts (nominal) |
| EMI/RFI | Complies with FCC Part 15 Class A, EU EMC Directive |
Physical | |
|---|---|
| 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 |
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 |
| 7701FR | 1RU Multiframe which holds 3 single slot modules |
| S7701FR | 7700 Series Standalone Enclosure |
Accessories | |
|---|---|
| 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 |