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| Silan Semiconductors FM RECEIVER CIRCUIT FOR BATTERY SUPPLY DESCRIPTION The SA1088 is a bipolar integrated circuit for use in mono portable and pocket radios. It is used when a minimum of perpheral components (of small dimensions and low costs) is important. The circuit contains a frequency-locked-loop(FLL) system with an intermediate frequency(IF) of about 70kHz. Selectivity is achieved by active RC-filters. De-tuning related to the IF and too weak input signal is suppressed by the mute circuit. SA1088 FEATURES * Equipped with all stages of a mono receiver from antenna to audio output. * Mute Circuit * Search tuning with a single varicap diode * Mechanical tuning with integrating AFC * AM application supported * Power supply polarity protection * Power supply voltage down to 1.8V SOP-16 APPLICATION 1. Mechanical tuning: This is possible with or without integrated AFC circuit 2. Electrical tuning: This is realized by one directional(band-up) search tuning facility, including RESET to the lower-band limit. PIN CONFIGURATIONS 1 2 3 4 5 6 7 8 16 15 14 MUTE VOAF LOOP VP OSC IF FB CLP1 VOIF TUNE CAP GND CLIM VIRF VIRF CLP2 VIIF SA1088 13 12 11 10 9 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-22 1 180pF 3.3nF 3.9nF 330pF 0.1F 470pF RUN 22nF BLOCK DIAGRAM 6 11 5k 70nH 7 8 9 10 13 15 3 82pF V1 Mixer All pass Filter 2.2k 2.2k +1 6k 5.4k IF Limter Silan Semiconductors 10k 68pF 220pF 12 VP 5 Demodulator 78nH V101 VCO V2 SA1088 6k Loop Filter 680pF +3V HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD 4 10nF 2 V2 AF 14 & 16 R S Searching tuning -1 V2 5.6k AF V3 MUTE 68nF RESET 1 0.1F 1.8nF 2 22k VoAF SA1088 Rev: 2.0 Note: V1,V2 and V3 are internal voltages. 2001-11-22 Fig.1 Block Dirgram and Application Circuit for Search Tuning. Silan Semiconductors ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Operating Temperature Storage Temperature SA1088 Symbol Vp Tamb Tstg Value 5 -10 ~ +70 -55 ~ +150 Unit V C C DC ELECTRICAL CHARACTERISTICS (Tamb=25C,Vp=3V ,Unless otherwise specified) Parameter Symbol Supply Voltage(pin 4) Supply Current(Pin 4) DC voltage of pin 1 DC voltage of pin 3 DC voltage of pin 6 and 7 DC voltage of pin 8 DC voltage of pin 9,10 and 13 DC voltage of pin 11 and 12 DC voltage of pin 15 AF output current on pin 2 Oscillator current on pin 5 Vp Ip V1 V3 V6,7 V8 V9,10,13 V11,12 V15 I2 I5 Test conditions Min 1.8 4.2 2.50 2.64 2.38 1.60 2.42 0.91 2.06 45 275 Typ 3.0 5.2 2.55 2.69 2.44 1.67 2.47 0.94 2.12 60 375 Max 5.0 6.6 2.60 2.74 2.50 1.74 2.52 0.98 2.18 80 500 Unit V mA V V V V V V V A A AC ELECTRICAL CHARACTERISTICS Parameter Symbol Tamb=25C,Vp=3V,Firf=96MHz modulated with f=22.5kHz and fm=1kHz deviation;EMF=0.3mV(e.m.f. at a sourse impedance of 75),and measurement taken in fig.3 Unless otherwise specified Test conditions VoAF=-3dB;VoAF=0dB at Vi=1mV;see Fig. 2 Mute OFF Mute ON (S+N)/N=26dB THD<10%,f=75kHz See fig.2 f=22.5kHz f=75kHz FM: 1kHz; 75kHz AM: 1kHz; MOD=80% Vp=100mVrms,f=1kHz RL=22k Limiting point Voltage at pin 16 Voltage at pin 3 Min Typ Max Unit RF Sensitivityinput voltage Vi(rms) 3 Signal handling Signal-to -noise ratio Total Harmonic distortion AM suppression of output voltage Ripple rejection Audio output signal Minimum output voltage on pin 16 Tuning steepness Oscillator steepness AFC steepness (S+N)/N THD AMS RR Vo(rms) V16 V/t fosc/ t IAFC/V3 47 7 60 3 6 5 200 56 1 2.4 52 10 85 Vp1.85 210 2.83 9.5 6 12 10 1.4 3.3 V V V mV dB % % dB dB mV V 120 Search Tuning(with V101 and C16=0.1F) See Fig.1 95 1.25 4.75 420 mV/sec 5.6 MHz/sec s 19 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-22 3 Silan Semiconductors PIN DESCRIPTIONS Pin No. 1 2 3 4 5 6 7 8 SA1088 Pin No. 9 10 11 12 13 14 15 16 Symbol MUTE VOAF LOOP Vp OSC IF FB CLP1 VOIF Description Mute output Audio frequency output signal AF loop filter Supply voltage Oscillator resonat circuit IF feedback Low-pass capacitor of 1dB amplifier IF output to external coupling capacitor(high-pass) Symbol ViIF CLP2 VIRF VIRF CLIM GND CAP TUNE Description IF input to limiter amplifier Low-pass capacitor of IF limiter amplifier Radio frequency input Radio frequency input Limiter offset voltage capacitor Ground All-pass filter capacitor.input for search tuning Electrical tuning/AFC output VOAF (dB) 20 0 2 2 -20 1 1 -40 S+N Noise -60 -80 -6 10 -5 10 -4 10 -3 10 -2 10 1: Mute ON 2: Mute OFF EMF (V) Fig. 2 Input sensitivity HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-22 4 Silan Semiconductors TEST AND APPLICATION CIRCUIT Rs=75 220pF 10k ViRF EMF 330pF SA1088 470pF 0.1F 68pF 82pF 70nH 16 TUNE 15 CAP 14 GND 13 CLIM 12 VIRF 11 VIRF 10 CLP2 9 VIIF SA1088 MUTE VOAF LOOP VP OSC IF FB CLP1 VOIF 1 0.1F 1.8nF MUTE Disable 2 22k 3 22nF 4 5 78nH 1.2k 18pF 27pF 6 3.3nF 7 8 +3V 10nF VOAF C1 Fig. 3 Test circuit and application for mechanical tuning 220pF 10k ViRF 470pF 0.1F 82pF 330pF 68pF 180pF 70nH 16 TUNE 15 CAP 14 GND 13 CLIM 12 VIRF 11 VIRF 10 CLP2 9 VIIF SA1088 MUTE VOAF LOOP VP OSC IF FB CLP1 VOIF 1 0.1F 1.8nF 2 22k 3 22nF 4 5 78nH 1.2k 18pF 27pF 6 3.3nF 7 8 +3V 10nF VOAF C1 C2 68nF D1 V101 Fig. 4 Application circuit with AFC for mechanical tuning HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-22 5 180pF 3.9nF 3,9nF Oscillator resonat circuit 33pF VP 12pF ON +3V OFF FM AM 4.7nF 22nF 47nF 180pF Battery switch FM 4.7nF Silan Semiconductors AM 8 VOIF IF FB OSC LOOP CLP1 VP VOAF MUTE 7 6 5 4 3 2 1 22F 3.9nF SA1088 AF Transformer VIIF CLP2 VIRF VIRF CLIM GND CAP TUNE earphone 22k 4.7nF HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD 9 330pF 10k 1F AF 10nF 100k 0.1F AF 33pF 33pF 470pF 10nF BAW62 2.7k UTC7642 6 10 11 12 13 14 15 16 27k 5.1 1F AF Amplifier 12 Volume Low High AM IF AM antenna SA1088 Rev: 2.0 2001-11-22 Fig.5 AM application circuit Silan Semiconductors PACKAGE OUTLINE SA1088 UNIT:mm 0.41 SOP-16-225-1.27 1.27 10.20 9.80 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-22 7 1.95 6.00 3.95 5.72 |
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