Samsung Wingo S-2450, Руководство по обслуживанию

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10-14 Samsung Electronics
IC Internal Diagram
No. 5688-2/9
LA1837
Parameter Symbol Conditions
Ratings
Unit
min typ max
[FM Mono Characteristics] fc = 10.7 MHz, fm = 1 kHz, with the coil adjusted so that V
AFC
– V
REG
= 0 V
Current drain I
CCO
-FM
With no input 18 31 44 mA
Demodulation output V
O FM
100 dBµ, 100% mod. The pin 16 output 730 1100 1460 mVrms
Channel balance C.B-mono 100 dBµ, 100% mod. The pin 16 output/pin 17 output –1.5 0 +1.5 dB
Total harmonic distortion (mono) THD
FM(1)
100 dBµ, 100% mod. The pin 16 output 0.3 1.3 %
Total harmonic distortion (mono) THD
FM(2)
100 dBµ, 200% mod. The pin 16 output 1.0 5 %
Signal-to-noise ratio S/N
FM
100 dBµ, 100% mod. The pin 16 output 72 80 dB
AM rejection ratio AMR 100 dBµ, AM 30 % mod. The pin 16 output 45 65 dB
Limiting input voltage –3 dBL.S.
100 dBµ, 100% mod. Referenced to the output.
26 32 38 dBµ
The input such that the output is down –3 dB.
LED sensitivity SD
On-FM
51 60 69 dBµ
LED bandwidth SD
BW
100 dBµ 85 120 170 kHz
IF count buffer output V
IFBuff-FM
100 dBµ. The pin 13 output 80 120 160 mVrms
S-meter output
V
SM-FM(1)
0 dBµ. The pin 11 output 0 0.1 0.5 V
V
SM-FM(2)
100 dBµ. The pin 11 output 3.6 4.3 5.0 V
Muting attenuation Mute-Att 100 dBµ, 100% mod. The pin 16 output 75 85 dB
[FM Stereo Characteristics] fc = 10.7 MHz, 100 dBµ, fm = 1 kHz, L + R = 90%, Pilot = 10%
Separation (left) Sep
L
L mod. The pin 16 output/pin 17 output 30 45 dB
Separation (right) Sep
R
R mod. The pin 17 output/pin 16 output 30 45 dB
Stereo on level ST
ON
The pilot modulation such that V7 is under 0.7 V. 1.3 2.7 5 %
Stereo off level ST
OFF
The pilot modulation such that V7 is over 4.5 V. 1.5 %
Total harmonic distortion (main) THD-main L+R mod. The pin 16 output 0.3 1.3 %
Brej-3rd
fs = 113 kHz, Vs = 90 %, Pilot = 10 %, The pin
40 dB
Adjacent channel interference
16 output vs. the L-R mod. 1 kHz demodulated output
rejection ratio
Brej-5th
fs = 189 kHz, Vs = 90 %, Pilot = 10 %, The pin
40 dB
16 output vs. the L-R mod. 1 kHz demodulated output
[AM Characteristics] fc = 1000 kHz, fm = 1 kHz
Current drain I
CCO-AM
With no input 15 25 35 mA
Detector output
V
OAM(1)
23 dBµ, 30% mod. The pin 16 output 100 180 360 mVrms
V
OAM(2)
80 dBµ, 30% mod. The pin 16 output 200 320 500 mVrms
Signal-to-noise ratio
S/N
AM(1)
23 dBµ, 30% mod. The pin 16 output 18 22 dB
S/N
AM(2)
80 dBµ, 30% mod. The pin 16 output 49 55 dB
Total harmonic distortion (mono)
THD
AM(1)
80 dBµ, 30% mod. The pin 16 output 0.4 1.2 %
THD
AM(2)
80 dBµ, 80% mod. The pin 16 output 1.0 4.0 %
LED sensitivity SD
On-AM
17 27 37 dBµ
Local oscillator buffer output V
OSC-AM
With no input. The pin 30 output 110 160 220 mVrms
IF counter buffer output V
IFBuff-AM
80 dBµ, no modulation. The pin 13 output 160 220 300 mVrms
ST-IF output V
STIF-AM
80 dBµ, no modulation. The pin 7 output 16 34 48 mVrms
S-meter output V
SM-AM
0 dBµ, no modulation. 0 0 0.2 V
Electrical Characteristics at Ta = 25°C, V
CC
= 9 V, in the specified Test Circuit
Allowable power dissipation, Pd max
–
mW
Ambient temperature, Ta – °C
Pd max – Ta