TECHNICAL DATA
6-9
The backlight on the display has a finite lifetime (normally a few years of continuous
operation). Therefore, the 8600 always implements a screen-saver timeout. This is
not user-adjustable.
Input Circuits
This circuitry interfaces the analog and digital inputs to the DSP. The analog input
stages scale and buffer the input audio level to match it to the analog-to-digital
(A/D) converter. The A/D converts the analog input audio to digital audio. The digital
input receiver accepts AES3-format digital audio signals from the digital input con-
nector and sample rate-converts them as necessary. The digital audio from the A/D
and SRC is transmitted to the DSP.
Analog Input Stages
Located on Input/output board
The RF-filtered left and right analog input signals are each applied to a floating,
balanced amplifier. The amplifier’s output feeds a circuit that scales, balances,
and DC-biases the signal. This circuit feeds an RC low-pass filter that applies the
balanced signal to the analog-to-digital (A / D) converter.
Note that the small RFI “tee” filter assemblies connected to the input and output
connectors are socketed and user-replaceable.
Component-Level Description:
The left channel balanced audio input signal is applied to the filter / load net-
work made up of L100-103 and associated resistors and capacitors. (There are
solder pads available in the PC board to accept an optional 600
Ω
termination
load [R106] on the input signal if the user wishes to install one.) A convention-
al three-opamp instrumentation amplifier (IC100 and associated circuitry) re-
ceives the input signal. R110-114 and quad analog switch IC101 make up the
circuit that sets the gain of IC100. The switches in IC101 set the gain of the in-
strumentation amplifier by switching resistors in parallel with R104. (Smaller
total resistances produce larger gains.)
IC100 feeds IC104 and associated components. This stage balances, DC-biases,
and scales the signal to the proper level for the analog-to-digital (A / D) con-
verter IC107. IC105A and associated components comprise a servo amp to cor-
rectly DC-bias the signal feeding the A/D converter. R137-139, C109, C110
make an attenuator / RC filter necessary to filter high frequency energy that
would otherwise cause aliasing distortion in the A/D converter.
The corresponding right channel circuitry is functionally identical to that just
described.
IC100, 101, 102, 103 are socketed for easy field replacement. All other circuitry
is surface-mounted and is not field-replaceable.
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