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PRODUCT DESCRIPTION

The ADA206XLR, ADA208XLR and ADA412XLR Analog Audio Distribution Amplifiers provide

two (206) or four (412) 1X3 distribution amplifier channels, and two (208) 1x4 distribution

amplifier channels, with balanced inputs and outputs. A master, gain adjustment for each

channel controls all three outputs together to adjust for varying inputs, while individual trimmers

for each output allow adjustment over a 20dB range to accommodate 10dbu semi-pro up to

+8dBm line levels.

Another of the ADA206XLR, ADA208XLR and ADA412XLR Distribution Amplifiers many

claims to fame is the use of XLR type input and output connectors. XLRs are easy to use but

make paralleling inputs for 1X6 or 1X12 operation difficult.

An LF347N quad bi-fet opamp forms the three variable gain output adjustment stages. These

variable gain stages use a unique circuit arrangement that allows us to provide a smooth,

logarithmic gain control for each output using an inexpensive (but good) linear cermet

potentiometer. Since we actually reduce the stage gain for low outputs rather than taking the

more conventional approach of reducing the input level to a fixed gain amplifier, you can use

the ADA at low output levels with very little noise penalty. You can use the ADA to match

consolemedium level inputs (-20dBu) or to drive semi-pro IHF inputs without requiring

outboard attenuator pads.

SSM2142 active balanced output drivers sense the voltage on their high and low output lines

and will shut off drive to a grounded output line while doubling the drive on the other. This

capability allows you to connect the outputs to balanced or unbalanced loads without regard

to whether or which side of the output is grounded. Maximum output at clipping is +22dBm into

balanced loads; however, even though the gain is the same under either condition, clipping

output is reduced by 6dB when driving an unbalanced load since the full output swing capability

of only one driver of the two is available.

The ADA family operates from a 15W – 24VDC single output switching supply featuring

universal AC input. Operating in the range of 85 – 264 VAC / 120 – 370 VDC, it offers low ripple

and noise at a max 150mV peak to peak.

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