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KRC-949D
CIRCUIT DESCRIPTION
Tuner microprocessor (uPD1707G-544)
@
Outline
uPD1707G-544
is a CMOS
LSI developed for FM/FW/
LW radios of PLL frequency synthesizer system good for
Built-in PLL and controller.
the whole world. Whether to use the PLL in the interior of
Manual and auto UP/DOWN
tuning function (saw-wave
uPD1707G-538 or to use an external electronic tuning PLL
mode).
1C LM7000 may be selected in the initial setting.
Preset of six stations can be stored independently
for
FM1/FM2/FM3/MW1/MW2/LW
(4 bands at maximum)
® Outline of functions
using six buttons.
1. Preset memoty initialize
©
Last channel memory FM/MW/LW, one station each.
©
Auto memory and preset scan function in a band.
© ABSS
function
which
detects
worsening
of receiving
status and begins UP SEEK.
© ABSS
function
which
detects
worsening
of receiving
status and begins preset scanning.
©
Clock function of 12/24 hours display.
Features
5V+10% single power supply.
000
@
1e)
Destination
Europe
+
183
South
87.50
Africa
;
108.0
:
Oceania
;
1602
Unit : FM MHz, MW, LW kHz
2. Receiving frequency
aa
Channel! space
Reference
Intermediate
Destination
|Band | Frequency range
[Manual | 'Ruts i trenueney
Pecuiney
FM_|_87.9~107.9MHz
mw |. 530~1620kHz
10kHz | 10kHz
450kHz
van
EFM [76.189 Nh
QkHz | QkHz | 9kHz
450kHz
M FM_ | 87.50~108.00MHz
5O0kHz | 25kHz | 10.700MHz/10.725MHz
522~1611kHz
QkHz | QkHz
450kH2/459kHz
155~281kHz
1kHz | 9kHz
450kHz/459k Hz
153~279kHz
kHz | 9kHz
450kHz/459kHz
South
87.50~108.00MHz | 25kHz | SOkHz
~10.700MHz/—10.625MHz
America
522~1611kHz
9kHz
9kHz
450kHz
87.5~108.0MHz | 100kHz | 100kHz
10.700MH2/10.725MHz
531~1602kHz
9kHz
450kHz
USA.
Europe
Oceania
Note : The minimum frequency of each band is stored in each preset channel of other bands.
Key input matrix structure
K, (Pin 39)
K, (Pin 40)
wma
|
K, (Pin 42)
Sa (Pin 49)
|__RapioyvpoweR
[|
ME
|
(OWN
Sd (Pin 46)
Mi
Se (Pin 45)
Ms
ee =
S|
|
ss
}_stpinaa)
Tt
CC CdS
CCS
Sg (Pin 43)
=
SENS
ee
ORAM
ee
BAND B
No
panoe
Nw
ping)
|
aT
NK
CN
CBANDD
CNN
SchBch
On
hf
a
NN
NN
8
[Momentary
switch
= [7
N| Diode matrix (short or open by diode)
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