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KT-7020
CIRCUIT DESCRIPTION
IC1: LM7001
(X05-342)
PLL frequency synthesizer
Block diagram
sre
XIN
XOUT
o
FMIN
AMIN
©
Terminal description
Pin name
Function
XOUT
ia)
|
|
|
|
Crystal oscitiator (7.2 MHz).
Data input.
0
{Clock for controtler (400 kHz).
Band data output.
BO1 can be used as a time base output
(8 Hz)
eCloOlNl/alaliatlwlry
Loca! oscillator signal input.
Power supply.
VOD2 for back-up.
Charge pump output.
Power supply.
Data input
Osta input
sititi
CL (PIN@)
DATA {PING}
CE (PING)
INTERNAL
OATA
16
Phase Detector
Charge Pump
CIRCUIT DESCRIPTION
118: MC1495L (X05-342}
MPX SUB demodulator
The Direct Pure MPX
enables stereo decoding without
causing beat interference. in theory, by linear-multiplying
two analog signals (stereo composite signal and 38 kHz sine
wave sub carrier signal).
This unit provides the linear multiplier with high S/N ratio,
which is designed with the new theory. so that the high
signal-to-noise rationof 94 dB for the MPX unit itself and
the resistance to overmodulation of 400% (dynamic range:
106 dB are realized while the conventinal characteristics
are maintained.
Internal equivalent circuit
KT-7020
2
Output
14 ikKxY)
X input
12 Composite
"
—O 10
300
500
$500
"O13
17
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