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ATI DA416 Quad 1X4 Audio Distribution Amplifier - Clipping Indicator
  • ATI DA416 Quad 1X4 Audio Distribution Amplifier - Clipping Indicator
  • ATI DA416 Quad 1X4 Audio Distribution Amplifier - Clipping Indicator
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ATI DA416 Quad 1X4 Audio Distribution Amplifier - Clipping Indicator

Manufacturer: DaySequerra

Item #: DA416   •   MFG #: DA416



LED Types:




Quad 1X4 Audio Distribution Amplifier - Clipping Indicator

Your DA416 provides four independent one-in by four out circuit groups. A four-output feed is sufficient for many applications; however, if you need more outputs, you can parallel channels by bridging several inputs across the same line for 1X8, 2X8 or 1X16 operation. Since each input circuit has 30k ohms balanced input impedance, you can simply terminate your source line with a single 620 ohm resistor (if necessary) and then parallel as many inputs as necessary across it. Each input can bridge line levels up to +24dBm without clipping. Common mode hum signals are attenuated by 70dB and the input resistor network is split and heavily bypassed for good protection from RF signals riding on the input lines. The input differential amplifier operates at slightly less than unity gain to optimize input headroom and to prevent any signal clipping from occurring prior to the gain controls. Each output consists of an adjustable gain stage driving the HI output terminal along with a unity gain inverter stage. The inverter drives the LO output in opposite phase to provide an active balanced output. The adjustable gain stage utilizes a unique circuit arrangement that allows us to provide a smooth, full range logarithmic gain control for each output using a linear cermet potentiometer. This circuit provides 20dB gain at full clockwise rotation, unity gain in the 12 o'clock position and tapers smoothly to full off at the full CCW position. Since we actually vary the gain of the output stage rather than taking the more conventional approach of adjusting the input level to a fixed gain stage, you can use the DA at low output levels with very little noise penalty. You can easily match the DA outputs to console medium level inputs (-20dBm) or drive semi-pro RCA inputs (single ended at .10Vrms) without requiring outboard attenuator pads. Each balanced output stage is isolated from the output terminals by DC blocking capacitors and 400 ohms of build-out resistance. The build-out resistors are split and bypassed to prevent any RF signals that might be picked up on an output line from feeding back into the DA. Your DA has clipping indicators to warn you of overdriven and overloaded outputs. These indicators individually sense nonlinear operation of any output channel by measuring the error voltage at the feedback terminal of the HI side output amplifier. As long as the output stage operates linearly, the error voltage at its negative input (for example WA pin 9) will remain very small. The onset of clipping, current limiting or even slew rate limiting immediately causes a large increase in this error signal, which is then fed through R25 to the error amplifier U5A at pin 13. U5A, in turn, drives the clipping LED through Q1. Feedback voltages also feed the error amplifier from three other output channels. To avoid any crosstalk through the summing network, CR3 across R13 prevents nonlinear clipping of U5A and therefore maintains an extremely small common point voltage at U5A pin 13. If any single output or any combinations of outputs are driven too high, they will light the clipping LED. Each clipping indicator monitors only four outputs, making it easy to locate the "hot" output.Your DA operates from a bipolar 15VDC regulated supply. The power supply is designed for minimum susceptibility to power line transients and conducted RFI using ferrite beads, double capacitive bypasses and a non-concentric wound semi toroidal power transformer.

  • Features

    • Sixteen balanced outputs divided among two or four independent 1-in-to-4-out channels.
    • Parallel inputs on rear connectors for 1x8, 2x8 or 1x16 operation.
    • Phoenix connectors provided for easy pre-wiring and flexible output channel assignment.
    • Individual wide range audio taper output level controls smoothly adjust outputs from +8 to -10dBm with taper to full off.
    • Separate LEDs for each 1X4 channel indicate either output clipping (standard) or input signal presence (-S models).
  • Specifications

    • OUTPUT LEVEL: +24dBm into 600 ohm balanced loads
    • THD: .001% typical, 20Hz to 20kHz
    • IMD: .05% maximum
    • SMPTE measurement.
    • SLEW RATE: 13 Volts per microsecond
    • RESPONSE: +/-. 25dB, 30Hz to 20kHz
    • NOISE: -100dBm EIN 20Hz to 20kHz
    • GAIN: 20dB maximum; each output has 40dB smooth adjustment range going to full off
    • CROSSTALK: 70dB minimum at 1kHz
    • OUTPUT IMPEDANCE: 400 ohms balanced, 200 ohms single-ended, split and RF bypassed, AC coupled.
    • INPUTS: 30K ohm active balanced, split and RF bypassed; +22dBm maximum input level.
    • HUM REJECTION: 70dB CMR at 60Hz.
    • POWER: 115/230 VAC +10%, 47-63Hz, 12 VA .
    • SIZE: 19" W x 1-3/4" H x 7-1/2" D; 5 lbs.
    • TERMINALS: Euro style modular connectors.
    • WARRANTY : Limited, One Year Warranty

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