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PDF SL1018 Data sheet ( Hoja de datos )
| Número de pieza | SL1018 | |
| Descripción | FM IF SYSTEM | |
| Fabricantes | AUK corp | |
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Semiconductor
SL1018
FM IF SYSTEM
Description
The SL1018 has versatile muting characteristics and allows receiver designers to realize the
muting performance according to their design concept.
Functions
• FM IF Amplifier/Limiter • Quadrature Detector • AFC Clamp • AGC Drive
• AF Mute Amplifier • Signal Meter Drive • DC Level Detector
Features
• Adjustable muting sensitivity • Soft muting function
• Variable maximum muting attenuation (6dB~40dB)
• Variable muting slope with respect to input signal level
• High limiting sensitivity with muting off • Good S/N ratio
• Clamped AFC output • Delayed AGC output for front end circuit
• Recommended supply voltage: VCC =8V
• Operating supply voltage range: VCC =7.5V~16V
• Low distortion • Good AMR
Application
• FM car stereo receiver
Ordering Information
Type NO.
SL1018
Marking
SL1018
Package Code
ZIP16
Outline Dimensions
45o
1.02
5.49
1.52
24.38
15.24
φ1.27 •0.31d
1.50 0.51
22.48
3.0
2 • φ3.05 • 0.13d
φ1.52 • 0.13d
3.05
7.11
12.12
1.78
3.23
0.51
0.254
3.00
unit : mm
3.0
KSI-W016-000
1
1 page  
Information On Muting Characteristics (continued)
Since the pin6 is connected to the base of the emitter ground
transistor through a protection resistor of 500Ω in series as shown
Fig.2. the voltage between pin6 and ground is about 0.7V when
the control current is applied. Actually, the muting operation is
accomplished by applying a muting drive output voltage(pin14) to
the pin6 through a high resistance(20kΩ )
The muting drive output is composed of three output devices:
① Hole Detector output which develops a voltage when C/N
(carrier-to-noise ratio) is lower than weak signal input conditions.
② A reversed output of the signal meter drive output.
③ A bandwidth limited muting drive output which develops a
voltage when the AFC output becomes higher than ±VBE during
tuning-off operation. All these output are led to an OR circuit and
the output is developed at pin14.
SL1018
I6
6
500
500
- Fig. 2 -
The inverted output of the signal meter drive output is obtained as shown Fig. 3.
Inverter
I1
Inverter
I1
Inverter
aI2
I1
I2
RL
IO
Vr
IL
V cc
IL = IO + I1 - aI2
Io : Offs et
15
Signal
Meter
Output
R15
16
AGC
Output
R16
14
Mu t i n g
De t e c t or
Output
-Fig. 3-
By Fig. 3, V14 is given by V14 = Vr－(IO + I1 -al2)RL－VBE. Conditions are Vr=4.9V, IO ≅ 0.2
mA, a ≅ 2, RL=22kΩ , VBE=0.7V, I1=V15/R15 , I2=V16/ R16, where V16 is a constant equal to
4.1V(Typ.) for medium or lower signal input levels where the muting drive output is
required. Since the V15 increase proportionally to the increase of the input signal level, I1
will also increase, and the V14 will decrease. Thus the required muting drive output can be
obtained by selecting proper values of R15 and R16 . Increasing R15 makes the slope of the
curve for the muting drive output vs. antenna signal input decrease, or decreasing the R15
increase the slope of the curve.
KSI-W016-000
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SL1018.PDF ] | |
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