ATI Technologies ADA208PH Kullanım ve Bakım Kılavuzu - Sayfa 2

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PRODUCT DESCRIPTION

The ADA208PH or ADA416PH provides two (208) or four (416) 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 clockwiserotation, unity gain in the

12 o'clock position and tapers smoothly to full off at the fullCCW 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 ADA at low output levels with

very little noise penalty. You can easily match the ADA 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 ADA.

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