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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
* Soft muting function * Variable maximum muting attenuation (6dB~40dB)
* Adjustable muting sensitivity
* 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
2 * o 3.05 * 0.13 d o.52 * 0.13d 1 24.38 o 45 15.24 1.02 3.05
unit : mm
5.49 1.52
7.11 12.12 1.78 3.23 1.50 0.51 22.48 3.0 0.51 0.254 3.00
o 1.27
*0.31d
30 .
KSI-W016-000
1
SL1018
Absolute Maximum Ratings
Characteristics
Supply Voltage Supply Current Power Dissipation Operation Temperature Storage Temperature
Symbol
VCC ICC PD T opr T stg
Rating
16 40 640 - 20 ~ + 70 - 40 ~ + 125
(Ta = 25 C) Unit
V mA mW E E
Block Diagram
Vcc IF Out 9 Quad In 11 Vref 13
12
VOLTAGE REGULATOR
AFC CLAMF
7
AFC
IF Input
1 2
1st Amp
2nd Amp
3rd Amp
4th Amp
5th Amp
6th Amp
QUAD LIMITER
QUADRATURE DETECTOR AF MUTE Amp 8
AF Output
Bias 3 LEVEL DETECTOR LEVEL DETECTOR LEVEL DETECTOR INVERTER HOLE DETECTOR DC LEVEL DETECTOR
5
Mute Attenuation Adjust
GND
4 AGC DRIVE SIGNAL METER DRIVE MUTE DRIVE
16 AGC
15
14 Mute Drive
10 GND
6 Mute Input
Signal METER Output
KSI-W016-000
2
SL1018
Test Circuit
Vcc(8V) Vout 15KHz 12dB/oct L.P.F 2.2uH SW V6 22K 0.047uF 0.047uF 0.01uF 47K
Icc 0.047uF Mute Drive(V14) + 4.7uF R16 22K VGC(V16)
2
4
6
8
10
12
14
16
100K 0.047uF 33pF
SL1018
0.47uF
1
300
3
5
7
9
L1 22uH R7
11
13
15
2.7K R15 22K 33pF Signal METER Output(V15)
0.047uF R8 4.7uF 100K + 5.1K
75 0.047uF
0.047uF
10K
FM SSG
330
L2 0.047uF
L3
10K
0.047uF
AFC
Vref
Electrical Characteristics
(Unless otherwise specified, Ta = 25E, Vcc = 8V, f = 10.7MHz, VIN = 100dB fm = 400Hz, Af = 75kHz ) i,
Characteristics
Quiescent Current Supply Current Detector Output Level Input Limiting Sensitivity Muting Sensitivity Total Harmonic Distortion Signal to Noise Ratio Muting Attenuation (1) Muting Attenuation (2) Muting Bandwidth AM Rejection Ratio Signal Meter Output 1
Symbol
ICCQ ICC VOD VIN (lim)
Test Condition
Quiescent
-
Min.
15 20 200 22
Typ.
21 25 260 25 26 0.05 78 15 28 210 63 0.1
Max.
27 30 320 29 32 0.2 20 32 370 0.3
Unit
mA mA mVrms dB i dB i % dB dB dB kHz dB V
VOD = 3dB down
VIN(mute) V14 = 2V THD S/N MA1 MA2 MBW AMR VSM1 V6 = 2V (22kO) V6 = 5V (22kO) V14 = 2V AM 1kHz 30% mod Quiescent
72 10 24 140 50 0
KSI-W016-000
3
SL1018
Electrical Characteristics(continued)
Characteristics
Signal Meter Output 2 Signal Meter Output 3 Signal Meter Output 4 Muting Drive Output 1 Muting Drive Output 2 AGC Output 1 AGC Output 2 Offset Voltage 1 Offset Voltage 2
Symbol
VSM2 VSM3 VSM4 VMD1 VMD2 VO (AGC)1 VO (AGC)2 VOS1 VOS2
Test Condition
VIN = 50dB i VIN = 70dB i VIN = 100dB i Quiescent VIN = 100dB i Quiescent VIN = 100dB i Quiescent, Pin 7 to 13 Quiescent, Pin 8 to 13
Min.
0.8 1.6 4.5 3.5 0 3.5 0 -0.25 -0.5
Typ.
1.4 2.4 5.3 4.2 0 4.1 0.02 0 0
Max.
2 3.2 6 5 0.3 4.5 0.3 +0.25 +0.5
Unit
V V V V V V V V V
Information On Muting Characteristics
The muting operation is performed by an AF mute amplifier, the gain of which decreases with the increased gain control current applied to the pin 6. (The control current is supplied by a muting drive circuit and change continuously the gain of an AF mute amplifier) But the gain does not decrease further when the control current reaches approximately 120 E or higher. The lower limit of the gain under this condition depends on a resistor connected between the pin5 and the ground. And the more the resistance increases, the more the gain decreases. Thus the maximum attenuation will be set by connecting the resistor between the pin5 and the ground. Fig.1 shows the muting attenuation with different R5 between the pin5 and the ground. P I N 6 C u r r e n t 6 I( u A ) 100 200
SL1018 8 SL101
I6 6 5 R5 8 AF Output: AF Output (dB)
0
-10 -20 -30
R 5 = 20KO R 5 = 100KO
- Fig. 1 -
KSI-W016-000
4
SL1018
Information On Muting Characteristics (continued)
Since the pin6 is connected to the base of the emitter ground transistor through a protection resistor of 500O 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(20kU) The muting drive output is composed of three output devices: c Hole Detector output which develops a voltage when C/N (carrier-to-noise ratio) is lower than weak signal input conditions. e A reversed output of the signal meter drive output. e A bandwidth limited muting drive output which develops a voltage when the AFC output becomes higher than VB E during tuning-off operation. All these output are led to an OR circuit and the output is developed at pin14. The inverted output of the signal meter drive output is obtained as shown Fig. 3. Vr Inverter I1 I1 Inverter I2 15 Signal Meter R1 5 Output 16 AGC Output R1 6 Inverter aI 2 I1 IO RL IL Vcc IL = O + 1 - a 2 I I I Io : O f f s e t
- Fig. 2 -
I6 6 500
500
14
Muting Detector Output
-Fig. 3By Fig. 3, V14 is given by V14 = Vr- (IO + I1 -al2)RL - VBE. Conditions are V r=4.9V, IO 0.2 mA, a 2, RL=22kU, 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
SL1018
Information On Muting Characteristics (continued)
Furthermore, varying the value of a resistor connected between the pin14 and pin16 changes the value of the muting control current required to obtain the same muting drive output, accordingly a slope of curve for muting attenuation vs. antenna signal input level is also changed. Fig. 4 shows these characteristics investigated by using an actual receiver. The method to adjust the muting circuit is to set the signal input level required to actuate the muting circuit with the R16 , to adjust the slope of the curve for the muting attenuations vs. antenna signal input with the R and to adjust the maximum muting attenuation 15 determined by setting the noise level at no signal. The slope of the curve for the muting attenuation vs. antenna signal input level can also be adjusted by the resistor connected between the pin14 and the pin6. However, if the resistor is too high, the muting control current does not flow into pin6 over than 120 E even though the maximum muting drive output(V 14) is applied, namely the muting attenuation doesn't reach its maximum value. A recommended value of the resistor between the pin14 and the pin6 is about 22kU.
5 4 Pin14,15,16 Voltage(V) 3 2 1 0 ANT Input V 14
V 15
V 16
-Fig.4- Fig. 4 -
KSI-W016-000
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SL1018
Typical Performance Characteristics Detector Output Level V AM Rejection Ratio (mVrms) (dB) AMR V (V) Total Harmonic Distortion THD (dB)BandWidth Muting Drive Output Signal to Noise Ration S/N (dB) 5 4 V14- a f 0 Muting Attenuation M (dB)
A
A6 M - V (22K)
14
VIN 100dBu = fIN 10.7 MHz =
3 2 1 0
10 20 Vcc = 8V PIN5-GND=100KO 30 0 1 2 3 4 6(e P i n 6 V o l t a g V )V V1 ,4 V ,5 V 6- V 1 1 IN 6 5 4 3 2 1 0 5 V14 V15 20 40 60 80 100 120 I n p u t V o l tIN( d B u ) age V 11 V14- V V16 fIN =10.7MHz,unmodulated
(V)
M A(dB)
-200 -100 0 100 200 Frequency Detune f (KHz) 10 0 -10 Vcc = 8V -20 f = 10.7 MHz 400Hz-75KHz dev. -30 -40 -50 AMR -60 -70 S/N T H D -800 20 40 60 80 100 120 I n p u t V o l tIN( d B u ) age V BW 7 M -R IN VODAMR, THD, S/N-V , VOD d B = 2 6 0 m V r m s ) (0
5
OD
500 Muting BandWidth M (KHz) 400 300 200
Pin VoltageV , V V,
14 14
15
16
Muting Drive Output V (V)
4 3 2 8 1 V c c= =25 V Ta oC fIN= 1 0 . 7 M H z u n m o d u l a t e d 0 80 85 90 95 100 105 110 Q u a d r a t u r e S11(n a l uV ig dB )
BW
100 V c c = 8 V VIN 100dBu = 0 1K 2 3 5 7 1 0 K2 3 5 7 100K 7 (O) Resistance R
KSI-W016-000
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SL1018
Typical Performance Characteristics (continued) 0 Muting Attenuation M (dB) M - Vcc A
V (mVrms) Detector Output
300
VO U-T V c c
A
fIN =10.7MHz FM: 400Hz-75KHz dev. 10 M A1 20 30 40 6 8 10 12 14 16 Supply Voltage Vcc (V) S/N - Vcc M A2
VIN =100dBu fIN =10.7MHz 280 FM: 400Hz-75KHz dev. 260 240 220 5 8 10 12 14 16 Supply Voltage Vcc (V) AMR - Vcc 68 66 64 62 60 6 8 10 12 14 15 Supply Voltage Vcc (V) VINm u t e ) - V c c ( fIN 10.7MHz, unmodulated = VIN =100dBu fIN =10.7MHz FM: 400Hz-75KHz dev. AM:1KHz-30%
Signal to Noise Ratio S/N (dB)
80 78 76 74 72 6
VIN =100dBu fIN =10.7MHz FM: 400Hz-75KHz dev. 8 10 12 14 16 Supply Voltage Vcc (V) VIN (lim) - Vcc
V (lim) Input Limiting Sensitivity
30 28 26 24 22 6
AM Rejection Ratio AMR (dB) Muting Sensitivity V (mute)
IN
OUT
fIN =10.7MHz FM: 400Hz-75KHz dev.
30 28 26 24 22 6
IN
8 10 12 14 16 Supply Voltage Vcc (V)
8 10 12 14 16 Supply Voltage Vcc (V)
KSI-W016-000
8
SL1018
Application circuit
KSI-W016-000
SL1018
9

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