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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 Inputs7720DAC-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 Inputs7720DAC-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 up to 4 single slot or 2 dual slot modules |
| S7701FR | 7700 Series Standalone Enclosure |
Accessories | |
|---|---|
| 7800FC | VistaLINK® Frame Controller |
| CP-2116E-H | Remote Control Panel |
| CP-2232E | Remote Control Panel |