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SSM2412 Datasheet(PDF) 11 Page - Analog Devices |
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SSM2412 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page SSM2402/SSM2412 REV. A –11– Figure 8. Switcher Functional Block Diagram Overall performance of the 16 × 1 stereo switcher is noteworthy. Input-to-output frequency response is flat to within 1 dB over a 10 Hz to 50 kHz band. Total harmonic distortion plus noise is less than 0.03%, from 20 Hz to 20 kHz. SMPTE intermodula- tion distortion is less than 0.02%. The use of ±18 V dc power supplies produces a +30 dBm clip level, even when driving 600 Ω loads. Table I. Circuit Performance Specifications Max Input Level +30 dBu Input Impedance, Unbalanced 100 k Ω Input Impedance, Balanced 200 k Ω Common-Mode Rejection (20 Hz to 20 kHz) >70 dB Common-Mode Voltage Limit ±98 V Peak Max Output Level +30 dBu/dBm Output Impedance 67 Ω Gain Control Range ±2 dB Output Voltage Slew Rate 6 V/ µs Frequency Response ( ±0.05 dB) 20 Hz to 20 kHz Frequency Response ( ±0.5 dB) 10 Hz to 50 kHz THD + Noise (20 Hz to 20 kHz, +8 dBu) 0.005% THD + Noise (20 Hz to 20 kHz, +24 dBu) 0.03% IMD (SMPTE 60 Hz & 4 kHz, 4:1, +24 dBu) 0.02% Crosstalk (20 Hz to 20 kHz) >80 dB S/N Ratio @ 0 dB Gain 135 dB The routing switcher bus carries high level unbalanced audio, but is driven with low impedance sources. With the output im- pedance of the SSM2015 at virtually 0 Ω and the SSM2402 switch ON, resistance is typically 60 Ω. Bus-to-bus crosstalk is exceptionally low. For example, assuming 14 pF coupling be- tween buses and 20 kHz signal, the crosstalk (isolation) exceeds 80 dB. The 14 pF would be representative for the 16 × 1 stereo design shown. Shielding of the buses with a printed circuit board ground plane and physically isolating the input and out- put circuits will reduce the crosstalk even further. The “T” con- figuration of the SSM2402 switch virtually eliminates crosstalk between the various input signal sources. The output amplifier incorporates a buffer amplifier that pro- vides 4 dB of gain (nominally), with adjustable output level trim control. The buffer also isolates the switching bus from the bal- anced output amplifier circuit. The balanced output is designed to drive 600 Ω loads and utilizes two SSM2134 IC amplifiers. The differential design increases drive capability, yet increases the heat dissipation surface area, and keeps IC package tem- perature well within safe operating limits, even when driving 600 Ω loads. The SSM2134 is recommended due to its low noise, wide frequency response, and output drive current capabilities. |
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