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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) * 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 * Adjustable muting sensitivity Application * FM car stereo receiver Ordering Information Type NO. SL1018 Marking SL1018 Package Code ZIP16 Outline Dimensions 5 2 * 3.0 * 0.13d 24. 38 45o 15. 24 1. 02 3. 05 unit : 1. * 0. 52 13d mm 5.49 1. 52 12.12 7. 11 1. 78 3. 23 0. 51 0 .254 1.5 0 0. 51 3.00 22.48 1.27 *0.31d 3.0 3. 0 KSI-W016-000 1 SL1018 Absolute Maximum Ratings Characteristics Supply Voltage Supply Current Power Dissipation Operation Temperature Storage Temperature (Ta = 25C) Symbol VCC ICC PD Topr Tstg Rating 16 40 640 - 20 ~ + 70 - 40 ~ + 125 Unit V mA mW Block Diagram Vcc 12 IF Out 9 Quad In 11 Vref 13 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 5 AF Output Bias 3 LEVEL DETECTOR LEVEL DETECTOR LEVEL DETECTOR INVERTER HOLE DETECTOR DC LEVEL DETECTOR Mute Attenuation Adj ust GND 4 AGC DRIVE SIGNAL METER DRIVE MUTE DRIVE 16 AGC 15 Signal METER Output 14 Mute Drive 10 GND 6 Mute Input KSI-W016-000 2 SL1018 Test Circuit Vcc(8V) Vout 15KHz 12dB/oct L.P.F 2.2uH SW V6 0.047uF 0.01uF 0.047uF 22K 47K Icc 0.047uF Mute Drive(V14) + 4.7uF R16 22K 100K 0.047uF 33pF VGC(V16) 2 4 6 8 10 12 14 16 SL1018 0.47uF 1 300 3 5 7 9 L1 22uH R7 11 13 15 R15 22K 33pF Signal METER Output(V15) 0.047uF 0.047uF R8 4.7uF 100K + 5.1K 75 0.047uF 0.047uF 10K FM SSG 330 2.7K L2 0.047uF L3 10K AFC Vref Electrical Characteristics (Unless otherwise specified, Ta = 25, Vcc = 8V, f = 10.7MHz, VIN = 100dB , fm = 400Hz, f = 75kHz ) 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 VOD = 3dB down 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 dB % dB dB dB kHz dB V VIN(mute) V14 = 2V THD S/N MA1 MA2 MBW AMR VSM1 V6 = 2V (22k ) V6 = 5V (22k ) 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 VIN = 70dB VIN = 100dB Quiescent VIN = 100dB Quiescent VIN = 100dB 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 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 N6 C u r r e n t I 6 (u A ) SL1018 SL1018 6 I6 5 8 AF Ou tpu t: 0 100 200 -10 AF Output (dB) -20 -30 R5 R 5 = 20K R 5 = 100K - 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 500 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(20k ) The muting drive output is composed of three output devices: Hole Detector output which develops a voltage when C/N (carrier-to-noise ratio) is lower than weak signal input conditions. A reversed output of the signal meter drive output. 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. The inverted output of the signal meter drive output is obtained as shown Fig. 3. Vr In v e r t e r In v e rt e r IL a I2 I1 I1 In v e r t e r I2 I1 IO RL V cc IL = IO + I1 - a I2 Io : O ffs e t 500 500 6 I6 - Fig. 2 - 15 S ignal Me t e r Ou tpu t R15 AGC Ou tpu t 16 R16 14 Mu t i n g De t e c t o r Ou tpu t -Fig. 3By Fig. 3, V14 is given by V14 = Vr(IO + I1 -al2)RLVBE. Conditions are Vr=4.9V, IO 0.2 mA, a 2, RL=22k , 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 R15 and to adjust the maximum muting attenuation 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 even though the maximum muting drive output(V14) 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 22k. Pin14,15,16 Voltage(V) 5 4 3 2 1 0 A NT I n p u t -Fig.4- Fig. 4 - V 15 V 14 V 16 KSI-W016-000 6 SL1018 Typical Performance Characteristics V14(V) V 5 4 14 - f 0 MA - V 6 (22K) BandWidth Muting Drive Output MA(dB) Muting Attenuation V I N = 100d Bu f I N = 10.7 MHz 10 3 2 1 0 -200 -100 0 100 200 F r e q u e n c y De t u n e f (KHz ) MA(dB) 20 V c c = 8V P I N5-G ND=100K 30 0 1 2 3 6 4 (V ) 5 P in 6 V oltage V V Detector Output Level VOD(mVrms) AM Rejection Ratio AMR (dB) Total Harmonic Distortion THD (dB) Signal to Noise Ration S/N (dB) 10 0 -10 -20 -30 -40 -50 -60 -70 -80 0 OD, A M R , T HD, S /N-V V O D (0d B=260mV IN V 6 14, V 15, V 16 -V IN r ms ) V14, V15, V16 (V) f I N =10.7MHz ,u n mo d u l a t e d 5 4 3 V 2 V 1 15 14 V c c = 8V f = 10.7 MHz 400Hz -75KHz d e v . A MR S /N T HD 120 20 40 60 80 100 I n p u t V o l t a g e V I N (d Bu ) Pin Voltage V 16 0 20 40 60 In pu t V olt a ge V IN 80 100 (d Bu ) 120 MBW - R 7 500 5 4 V 14 -V 11 MBW(KHz) 300 Muting Drive Output V14(V) 400 3 2 V c c = 8V T a = 25 o C f I N = 10.7MHz u n mo d u l a t e d 80 85 90 95 100 11 Muting BandWidth 200 100 0 1K V c c = 8V V I N = 100d Bu 2 3 5 7 10K 2 3 5 7 100K 1 0 105 (d Bu ) 110 R e s i s t a n c e R 7 () Q u adratu re S ignal V KSI-W016-000 7 SL1018 Typical Performance Characteristics (continued) MA - V c c 0 f I N =10.7M Hz F M : 400H z -75KH z d e v . VOUT(mVrms) V 300 OUT - V cc MA(dB) 10 MA1 280 V I N =100d Bu f I N =10.7M Hz F M : 400H z -75KHz d e v . Muting Attenuation 20 MA2 30 260 Detector Output 240 40 6 8 10 12 14 S u p p l y V o l t a g e V c c (V ) 16 220 5 8 10 12 14 16 S u p p l y V o l t a g e V c c (V ) S /N - V c c 80 68 A MR - V c c Signal to Noise Ratio S/N (dB) AM Rejection Ratio AMR (dB) 78 66 V I N =100d Bu f I N =10.7M Hz F M: 400Hz -75KH z d e v . A M:1KHz -30% 76 V I N =100d Bu f I N =10.7M Hz F M: 400Hz -75KH z d e v . 64 74 62 72 6 8 10 12 14 16 S u p p l y V o l t a g e V c c (V ) 60 6 8 10 12 14 15 S u p p l y V o l t a g e V c c (V ) V 30 VIN(lim) I N (l i m) - V cc 30 V I N (mu t e ) - V cc f I N =10.7M Hz F M: 400Hz -75KHz d e v . VIN(mute) f I N =10.7M Hz , u n mo d u l a t e d 28 28 Input Limiting Sensitivity 26 Muting Sensitivity 6 26 24 24 22 8 10 12 14 16 S u p p l y V o l t a g e V c c (V ) 22 6 8 10 12 14 16 S u p p l y V o l t a g e V c c (V ) KSI-W016-000 8 SL1018 Application circuit KSI-W016-000 SL1018 9 |
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