AN7025K PANASONIC
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 6
Technical content
Unit : mm @ Description The AN7025K is a one chip monolithic integrated circuit cn io 23 incorporating AM-Tuner, FM-IF, FM-MPX functions within = i a single 22-pin DIP package. Applications for this IC <] ie y include use in portable radios and radio-cassette tape s S Ee « recorders. a oS re & | ce > | <q i | > op 12 ; @ Features — Lt @ = 1-chip IC incorporating AM Tuner, FM IF and FM MPX " ~ functions 150% | @ Low power consumption, Icqg = 7.2mA (FM), 180 4.3mA (AM) @ Wide operating voltage supply range: Vcc = 1.8V ~ 6.6V eS @ Built-in stereo indicator drive and AM AGC 76 @ Phase-locked-loop MPX demodulation 22-Lead Shrunk DIL Plastic Package (22-SDIP) ®@ Block Diagram Vcc te? ic DC AM IF Amp. | FF 4 Vp-Det. 19k : AM/Det. Stereo FF AM/Mix Ind. vco AGC = 38k GND
@ Absolute Maximum Ratings (Ta=25°C) Operating Ambient Temperature °C Storage Temperature °C Operating Supply Voltage Range: Vcc = 1.8V ~ 6.6V @ Electrical Characteristics (VCC=3V, Ta=25+2°C ) FM AM Sensitivity Voyam) = 20mV dB MPX Pilot OFF Level [Voorn | Vie = 80dBH, Vp = 10% mod (19kHz) 11 % Cwietak |G [Manette [| || Input Impedance Pin 15 | [2] | kQ- Output Impedance | Zou | Pin 13, 14 | of sf] | Ke Note: FM - fin = 10.7MHz, 1kHz, 30% mod. AM - fin = 1MHz, 400Hz, 30% mod. MPX - fin = 10.7MHz, 1kHz, 100% mod.
a B Pin
1 AM Mixer Input MPX Phase Detector Filter
2 AM Mixer Output L-Channel Output
3 AM Mixer By-pass | «4 | R-Channe] Output
5 AMAGC | 16 | __F Detector Output
6 AM Detector Output Quad. detector coil.
10 MPX Pilot Detector Filter | oa | FM Finpt
[From FE of { Fitter | 0.022 By mi y ee 3 im 50 a at beauties H ZZ i BS 5.6x Iu 273.34 La nz } Ik naz Iwz 0.022 0.0224 {0.022 1000p Ea = FM
150 YE S Q
@O-O]-O-O9-O-0-O%} 49D AM AMIN 0.047, z at ap 0.022 50 i ‘y Mono, 4 18k 3 ee T2 41p a ig » WZ 680p Sis: 560 7 S ee i o0ssu O.1p ST 10k A55BL events | 19kHz Check O—Q 5 O} Indicator: Lunn og Leeencrne
@ Application Circuit Vee oO FMIN From FE. UZ on2u] 22041] 200k fey BE T ROut Lout é iz: SB S5.6k 4 af PPO ra i pm lpzZ ik o.o22p{0.022[, 1000p 220p 272 FM nf 7 lS7 6 oF AMIN it at poo (A) io 18k i oo in ° » te lL sig perenn T2 a STR pial 680p iF i aig 47p 0.1L 560 10k 455BL ™@ Coil Specifications MITSUMI : g = ®-® 877 | 130420% Tl AMOsc. | AO2B105 | (5k7-H14) = @-© or (f=796kH2) ~ 10T AMIFT MITSUMI = Oe) T2 12B 153M | (IFT- 3 ®@-@ 43T | 100430% 14) : = @ ®-@ 8 73 eM MITSUMI = @-@ 2 | 90420% } NUE, (IFT-41K9) =_ ®-®© st
@ Application Notes . . ae DC Bias Punetion (Wec=3V) AM | 1 | AM Mixer input. Open base input. 3V AM Mixer output. Open collector output. 3V 3 AM Mixer by-pass. Small adjustments in noise level can be achieved 0.78V by changing the by-pass capacitor value. ° Vo = a Without by-pass capacitor > no With by-pass capacitor Vin AM IF Input. Input impedance at 455kHz is 2.5kQ. An additional 40 2.6V ~ 100pF by-pass capacitor may be added after the ceramic filter to teduce AM IF beat. S/N may be changed by this modification. i i 8 om pre 4 6 | AM detector output. 1.8V 7 AM AF input. The external components between these two pins form 0.7V part of the peak detector and high pass filter. C1 forms part of the peak detector circuit and C2, R part of the high pass filter or low frequency gain reduction. © C2R | 2k OQ-> lamp NN - Peak Detector High Pass Filter Vo without HPF By changing the values of R & C2, Vo level at low frequencies may be changed. R also acts as load for the VCO 19kHz check signal in FM stereo mode.
@ Application Notes (Continue) : . a | DC Bias Function Description (Vcc=3V) MPX LED stereo indicator. Open collector output with maximum current . = 5mA hence only red LED's may be used. MPX pilot level/detection low pass filter or mono/stereo switch. VCO 23 operation is stopped when this pin is connected directly to Vcc. 3V i VCO free-run frequency adjust. VCO frequency can be adjusted manually through the variable resistor connected at this pin. 2.4V 12 | FM/AM switch or PLL low pass filter. 2.3V 13 Left & right channels output. 1.4V 14 Output impedance = 5kQ. - os | MPX input. Input impedance = 22kQ 0.6V IF detector (AM/FM) output. Output impedance = 2.5kQ. Capacitor 13V C determines channel separation. 22k 2k 18k ¥ 7 Quad. detector coil. The internal 10pF capacitor and quad. detector 2.45V FM 17 coil form the phase shifter of the quad. detector. Small adjustments of damping resistor, R permit Q & bandwidth adjustment. : R 10p i 21 FM IF input. Input impedance at 10.7MHz is 470Q. FE gain can be . reduced by adding R1 & R2 as required to reduce FM IF input level. RI i a SR2 : [J470 n AM local oscillator. Oscillator level = 100mV at 1.455MHz. R2 3V prevents oscillator stopping. R1 is a dumping resistor to reduce oscillator level. “Aas Voc