AN7024 PANASONIC | Alldatasheet
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AM Tuner, FM-IF + MPX IC for Radio, Radio Cassette Recorder @ Description Unit : mm The AN7024 is a monolithic integrated circuit incorporating 60 AM-Tuner, FM-IF, FM-MPX and demodulation circuit — nm which is most suitable for radio cassette recorder. Tr =e a] Integration into 18-pin ZIL package makes possible to =" =f] reduce external parts. (7 pieces reduced by in-house —nt olf comparsion) ot —= at a s “HA —— 2/5 @ Features i ——s aad = @ Incorporating on a single chip (AM Tuner, FM-IF, FM- V _ MPX) 0.25 @ Fewer extemal parts — © Built-in stereo indicator aoa int ps @ Vccrange: Vcc =3V~7V \\ 28 pa 18-Lead ZSIL Plastic Package (18-ZSIP) @ Block Diagram GND uad MPX ne Drive AGC mp. FF 19kHz RF IF Amp. Vcc
@ Absolute Maximum Ratings (Ta=25°C) Supply Voltage v Operating Ambient Temperature °C Operating Supply Voltage Range: Vcc = 3.0V ~ 7.0V ® Electrical Characteristics (VCC=SV, Ta=25°C) FM AM Signal to Noise Ratio [smu |Vn=sopn Tt we | MPX Che Blane [8 [Ve=toamn Moma Stereo Separation |_Sep_|Vin=80dBu,sereo | 36 | 6 || a Note) Unless otherwise specified, FM: monaural; fin = 10.7MHz, 1kHz 30% modulation Stereo; fin = 10.7MHz, 1kHz 100% modulation (L + R = 90%, pilot 10%),
@ Explanation of Test Circuit and Test Methods lig 32 gS + er} 050 AF Om ly 5° ol d__38kHz O Check T2 TI on
4 SHS Sills Si i 7
t * 10k 50 50 4 3.3 4 $ S 0.33; 50 50 B 10k 5 0.0lp Switch Note: ae 1AM c¢ +: 1R-channel Output (1) Free-running must be adjusted to 2FM 2 L-channel Output 38kHz + 100Hz b- 1 Stereo d-- 1AM (2) 470pF Styrole or Polyster Capacitor
2 Forced Mono 2 FM 38kHz Check (3) Low Pass Filter used for BL-13 or BL-14
e 1 Stereo Signal Output (4) Stereo output signal is external modulated to
2 Mono Signal Output FM-SG
@ Coil Specifications FM Quad =O, ®-@® 7T Tl Coil IFT-41K9 | MITSUMI = @®-@® 4T 100pF 90+20% 10.7MHz =a) ®-© 27 AM MW : g S ®-® 87T T2 Osc. Coil L-5K7-H4| MITSUMI| @ = @- © « 100420% T3 Output IFT-21K7 | MITSUMI = @®-@® 427 1500pF 130420%
@ Application Circuit of AN7203 and AN7024 2 1200 . . Ro & (2) 107 66 #N y 66 a ©) dory ed 916 — = 7 1 a[s| | < ht © yy A pas 3 = (=) = = E os +N - ©) & ovos Hs Ts10°0 ©) 2 He O- 78 an i (~) Z # 3 (GK N g dl a ed dese] SF 2 mre. & © a iH 2 DEERE ST. ©) e bee ad (-) e @) Hs Is 1100 Ss O— S 5 ea be
@ Pin Descriptions Pin No.| Pin Name| ,, DC Equivalent Circuit Description Voltage Vee Vee Configuration of RF amp is differential amp. g p Input of base T1 & T3 need dc bias via 1 0 external coil to Vcc. a Usable sensitivity is better if antenna coil is Input if O AGC operates when T1 & T2 are off, T3 & 7 wy T4 are on, becoming differential amp for oto small signal. QA oOo On the other hand, when T1 & T2 are on, T3 S G 8 nen “ WG Oo & T4 are off, becoming differential for large signal, —~ Configuration of OSC circuit is a differential Vee amp. Voc (] Note that OSC stops when Q factor of external coil is low. AM To test for OSC stop, use bare hand to touch 2 Oscillator SV = i) on the secondary coil pins. Q)> In good case, when hand is removed, OSC BR restarts. Resistor R is for the prevention of stop OSC. A If R=0, then at Vcc "ON", there is no DC g loading and T1 & T2 are not "ON", there will be no oscillation. Level at pin 2 is 120mV. Vec Vee i , Input impedance decided by 500Q internal ao U 0 resistor. 3 5V | @) Limiting amp configuration is a 5-stages gy differential amp. FMIFIN ‘The total gain is 60dB. Vec Vec ~ S85 OZ J # Vcc . a . 4 AM MIX 5v imp Cy U] Mixer configuration is double-balanced mixer. OUT LY Oscillation leakage is minimized. 8 8 8 | Voc Vee f ry % AGC operates by controlling the emitter it 0 0 (] current of first stage IF amp. 6 AMIFIN 5V J ©) Input impedance decided by 2.5kQ resistor. AM IF amp configuration is 3-stages AM IF IN differential amp. Q2aAa The total gain is 60dB.
4 O99
@ Pin Descriptions (Continue) Pin No.| Pin Name Dc Equivalent Circuit Description . Voltage Wed Req " AGC a 88 AGC output impedance is HOkQ. MPX Phase detector LPF output impedance is 7 | Pilot 14v 109 ai | 10kQ. Signal | pS Common value 3.3HF capacitor at pin 7. ir in 4 7] 3.3627 iF vy Cannot connect low impedance circuit to pin 7. 8) Z FM detector configuration is quadrature detector. 8 5V 400[] | Vec Phase shift capacitor is located internally. 5.6kQ resistor affects detector output level & harmonic distortion. Vec ¢ 9 Detector |AM 0.3V| AMo | ik Common for both AM & FM. Output FM 0.7V| FMo co = (9) Zt Output impedance is 1kQ. (] J 10 0.015p a Output circuit configuration is a current mirror. KDA : Output impedance is 5kQ. MPX 1.2V ) [} Vee Time constant & de-emphasis is 75s, Output . determined by external capacitor 0.015pF. [TN Output dynamic range is fixed at 800mV. 12 No effect by Vcc. G8 [5k | = OZ. 7 Input impedance is 30kQ in AM mode & 100kQ 2Voec in FM mode. 11 MPX IN 0.7V 8 The input coupling capacitor is 0.22uF. Cutoff frequency is 5SHz for AM & 7Hz for AMo- : FM oc
@ Pin Descriptions (Continue) Pin No.| Pin Name DC Equivalent Circuit Description Voltage v7 Capacitor at pin 13 and output impedance of pin CD-#Vec 9 decides the input impedance of pin 13. AM Pin 13 is joined to GND by low impedance 13 | Hi-cut oav Par in AM mode. High-cut frequency is 4.8kHz. In FM mode, pin 13 is high impedance. Ad Used as switch for FM/AM & force mono. cms rad Please use discrete parts for LPF. B Es If discrete parts are not used, the characteristics for THD & S/N in stereo mode will be poor. AM 5V mea H U When switch is open, FM stereo mode. MPX FM 1.4V 8 When switch is GND, FM mono mode. 14 | Phase | (Stereo) a Detector When switch is Vcc, AM Mode. LPF tone) 'Vec 14v Please maintain this switching condition at 0.5V AM Ik I & below for FM mono mode. mage ae For AM, use 2.5V & above. oto +220 am = Current in AM mode from Vcc to pin 14 is P4 = 800pA. When pin 14 is switched to GND, there is no Mono current. Oscillation of this circuit is 76kHz, determined by external resistor & capacitor. AM 0V 10k For VCO adjustment, please join 330kQ 15 vco FM 76KH between pin 16 & GND. z . Oscillation 10k 4170p Adjust vco range to 38kHzt100Hz. T The 470pF is a styrole/polypropylene film capacitor for guarantee of temperature characteristics & limits. AM 33V ‘Veco Current capability is 30mA maximum. piereo FM 0. BV Ik Usable LED current is 4mA.
16 Driver and (Stereo) For VCO monitor, please join 330kQ resistor
vco FM 42V x30 300 to GND. monitor (Mono) 36k Only this pin can be connected to 12V via ° 1kQ pull-up resistor. Vcc for FM stage
5 Vec Connect centre pin of ceramic filter to this
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