The 7700ADA-AUD-MM Balanced Analog Audio Distribution Amplifier with Mono Mix is a general-purpose amplifier for distributing analog audio signals and providing a mono mix output of the stereo inputs. It can be operated with either differential or single ended inputs and offers a wide range of gain adjustment to handle a wide variety of input signals.
The 7700ADA-AUD-MM occupies one card slot and can be housed in the 1RU 7801FR frame which holds up to four single or two dual slot modules, the 3RU 7800FR frame which has a 15 slot capacity, or the portable 3RU 350FR frame which has a 7 slot capacity.
Features
- Differential and single ended inputs (automatic single ended to differential conversion)
- High impedance inputs
- Low impedance outputs
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- Wide gain adjustment range
- High common mode range and common mode rejection ratio
- Very high SNR and very low THD+N
- Mono Mix of the stereo input
- Module Status/Local Fault
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Block Diagram
Specifications
| Analog Audio Inputs |
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| Standard | Any analog audio signal |
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| Number of Inputs | 2 (Balanced or Single ended) |
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| Connector | 3-pin removable terminal strips |
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| Maximum Input Level |
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| 0dB Input Gain | +33dBu |
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| +6dB Input Gain | +28dBu |
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| Noise Floor | -87dBu (0dB input gain), -91dBu (+6dB input gain jumper setup) |
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| Common Mode Rejection | > 90dB @ 60Hz, 60dB @ 20kHz (tested with +28dBu CM input) |
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| Common Mode Range |
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| 0dB Input Gain | > ±22V |
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| +6dB Input Gain | > ±7V |
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| Input Impedance | 0dB Input Gain 33kΩ
+6dB Input Gain 15kΩ |
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| Analog Audio Outputs |
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| Number of Outputs |
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| Distribution AmplifiEd Outputs | 3 outputs each of left and right channels |
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| Mono Mix Outputs | 2 outputs total |
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| Connectors | 3-pin removable terminal strips |
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| Maximum Output Level | +28dBu across hi-impedance load
+24dBm into 600Ω load |
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| Output Impedance | 66Ω |
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| Frequency Response | ±0.02dB 20Hz to 20kHz |
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| Stereo Phase Mismatch | < 1°@ 20kHz |
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| SNR |
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| 0dB Input Gain | 115dB |
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| +6dB Input Gain | 119dB |
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| THD+ Noise | 0.001% 20Hz to 20kHz @ 28dBu, unweighted RMS |
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| Intermodulation Distortion | 0.001% - SMPTE @ 18dBu |
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| Stereo Crosstalk | > 115dB @ 1kHz, > 93dB @ 20kHz |
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| Available Gains |
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| Input Step Gain | 0dB or +6dB (configurable with jumpers) |
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| Fine Gain Control | -5 to +5dB (card edge pot adjustable) |
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| Output Step Gain | 0, 3.5 or 9.5dB (configurable with jumpers) |
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| Electrical |
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| Voltage | +12V DC |
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| Power | 12 watts |
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| EMI/RFI | Complies with FCC regulations for class A devices
Complies with EU EMC directive |
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| Physical |
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| Number of Slots | 1 |
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