6-8
TECHNICAL DATA
ORBAN MODEL 6300
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
termination
load [R106] on the input signal if the user wishes to install one.) A conven-
tional three-opamp instrumentation amplifier (IC100 and associated circuitry)
receives 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, 102 are socketed for easy field replacement. All other circuitry is sur-
face-mounted and is not field-replaceable.
2.
Stereo Analog-to-Digital (A/D) Converter
Located on input/output/DSP board
The A/D converter, IC107, is a stereo 24-bit sigma-delta converter. (This is a sur-
face-mount part and is not field-replaceable,)
The A/D oversamples the audio, applies noise shaping, and emits a bitstream at
48 kHz sample rate.
3.
Digital Input Receiver and Sample Rate Converter (SRC)
Located on input/output/DSP board
The receiver IC300 accepts digital audio signals using the AES3 interface format
(AES3-1992). It applies its output to sample rate converter IC302. This accepts and
sample-rate converts any of the “standard” 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz,
and 96 kHz rates in addition to any digital audio sample rate within the range of
32 kHz and 96 kHz. The SRC converts the input sample rate to 48 kHz for process-
ing by the DSP.
Receiver IC301 accepts sync signals in either AES11 or wordclock formats and
generate a reference sample rate for the 6300’s output sample rate converters.
Relay IC304 determines if the 6300’s sync input will accept AES11 or wordclock.
These chips are surface-mounted and not field-replaceable.
Содержание OPTIMOD 6300
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