CXA1538M/N/S FM Stereo/AM Radio For the availability of this product, please contact the sales office. Description The CXA1538M/N/S is high performance one-chip bipolar ICs designed for FM stereo/AM radios. These include an FM/AM front end, FM/AM IF amplifier, FM/AM detection output and FM stereo demodulator output. CXA1538M 30 pin SOP (Plastic) Features • Low current consumption (In FM mode ID=11.0 mA, in AM mode 8.5 mA, VCC=6.0 V) • Built-in LED drive circuit for tuning • Built-in LED drive circuit for stereo indicator • Built-in muting circuit for the FM band • Few external parts CXA1538S 30 pin SDIP (Plastic) CXA1538N 30 pin SSOP (Plastic) Absolute Maximum Ratings (Ta=25 °C) • Supply voltage VCC 14 V • Operating temperature Topr –10 to +60 °C • Storage temperature Tstg –55 to +150 °C • Junction temperature Tjmax 125 °C • Allowable power dissipation PD CXA1538M 500 mW CXA1538N 410 mW CXA1538S 1050 mW Recommended Operating Conditions Supply voltage VCC 2 to 9 V Structure Bipolar silicon monolithic IC Block Diagram GND PLL LPF 2 MPX REG VCO 30 29 28 27 FM DISCRI MUTE 26 25 AM OSC AFC FM OSC REG FM RF 24 23 22 21 20 MULTIPLEX REGULATOR VCO FM/AM FE GND FE OUT AM RF FM RF IN IN 19 18 17 16 14 15 FM FE REGULATOR AM FE PD 1 MUTING 1/2 COUNTER DC AMP PD 2 FM IF/ DISCRI AUTO BLEND BU AMP BU AMP DECODE AMP M/ST SW AM IF/DET RIPPLE FILTER ST IND 1 2 3 4 5 6 7 PLL LPF1 PILOT DET LPF2 PILOT DET LPF2 ST IND Rch OUT Lch OUT VCC DETUNE MUTING CONTROL DC AMP 8 9 RIPPLE AGC FILTER AFC 1 VCO CHECK TUNING IND 10 11 12 13 AGC AFC 2 GND TUNE IND FM IF IN PD : PHASE DETECTOR BU : BUFFER FE : FRONT END AM IF BAND IN SELECT DET : DETECTOR IND : INDICATOR Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. —1— E93313D8X CXA1538M/N/S Pin Description and Equivalent Circuit No. 1 Symbol Pin Voltage (V) VCC=3 V VCC=6 V FM AM FM AM Equivalent circuit Description MPX REG PLL LPF1 26k 26k 0.97 0.97 0.97 0.97 29 PLL LPF2 2 PILOT DET LPF1 LPF for PLL 29 1 0.95 0.95 0.95 0.95 LPF’s C (1µF) for PILOT DET inserted between pins 2 and 3 3 3 PILOT DET LPF2 2 0.95 0.95 0.95 0.95 MPX REG 4 ST IND VCO CHECK Stereo indicator drive circuit and output for VCO check 4 6k 1.6 1.6 4.5 4.5 VCO 5 Rch OUT 0.66 0.66 1.5 1.5 Stereo Rch output pin 5 6 6 Lch OUT 0.66 0.66 1.5 1.5 Stereo Lch output pin 7 VCC 3.0 3.0 6.0 6.0 Supply pin 8 Ripple FILTER 17k 2.7 2.7 4.0 4.0 17k 8 140k Ripple filter 33k 9 AGC/AFC1 1.32 1.15 1.32 1.15 9 22k 50k 3.25k 10 AGC/AFC2 1.15 1.47 1.15 1.47 25k —2— 10 AFC pin in J band, determines time constant of AGC in AM (depending on external capacitor). AFC pin in W band, determines time constant of AGC in AM (depending on external capacitor). CXA1538M/N/S No. Symbol Pin Voltage (V) VCC=3 V VCC=6 V FM AM FM AM 11 GND 0 0 0 25 MUTE 0.05 0.01 0.05 0.01 12 TUNE IND 1.6 1.6 4.5 4.5 13 FM IF IN Equivalent circuit 0 Description 25 Time constant for muting provided 11 12 15 FM/AM tuning indicator drive circuit FM IF input pin 33C 1.35 0 1.35 15 0 GND of FM/AM IF and DET stage 13 3k BAND SELECT FM/AM band switching pin : AM at GND and FM at OPEN 1k 14 AM IF IN 16 FM/AM FE OUIT 0 0 0 14 0 AM IF input pin 2k AM Block FM Block 0.57 0.2 0.8 0.2 16 AM/FM IF output pin to connect with IF filter 220 17 FE GND 0 0 0 0 GND of FM/AM front end 3p 20 18 FM RF IN 0.3 0 0.3 0 20 FM RF 1.25 1.25 1.25 1.25 FM RF amplifier circuit for FM RF input FM RF amplifier circuit to connect to RF tank circuit 18 1k 17 FE REG 19 AM RF IN 1.25 1.25 1.25 1.25 AM RF input to connect to bar antenna 19 GND —3— CXA1538M/N/S No. 21 Symbol Pin Voltage (V) VCC=3 V VCC=6 V FM AM FM AM Equivalent circuit Description REG Regulator output 21 1.25 1.25 1.25 1.25 1.25V REG 23 23 AFC Variable capacitance for AFC 22 22 FM OSC REG 1.25 1.25 1.25 1.25 FM local oscillation circuit 24 24 AM OSC REG 1.25 1.25 1.25 1.25 AM local oscillation circuit 26 26 FM DISCRI 27 VCO 2.30 2.70 3.60 4.00 Phase shift circuit to connect to ceramic discriminator 1k 28 28 MPX REG 30 GND VCO control pin for stereo demodulation 27 1.65 1.65 1.65 1.65 0 0 0 MPX REG Regulator for MPX 0 30 —4— GND of MPX block CXA1538M/N/S Electrical Characteristics Item Symbol (Ta=25 °C, VCC=6 V) Test Output waveform Point and Test method Circuit current (1) ID1 ID AM no signal Circuit current (2) ID2 ID FM no signal V1 to V5 input short SW condition SEP VD 50 dBµV, 10.7 MHz, 1 kHz, Max. Unit 5.0 8.5 12.0 mA 7.0 11.0 15.0 mA 30 40 — dB 16 23 30 dB 1.8 3.0 5.0 mA A 28 35 42 dB B 35.0 77.5 138 mVrms — 25 31 dBµV — 0.1 2.0 % 0.1 2.0 % –50 0 +50 kHz 1.8 3.5 7.0 mA 43 48 dBµV 41 46 dBµV 1 10 41 dB 19 24 28 dB 15 21 29 dBµV 35.0 77.5 138 mVrms 1.3 3.0 7.0 mA — 0.6 2.0 % 2 3 4 5 6 8 9 10 A A A B A B OFF A OFF A Separation when VIN3= Separation Typ. 1 A B / B B 22.5 kHz dev input ON Attenuation of noise level FM MUTE A1 VD When VIN3=no signal, A A / OFF S8 ON/OFF STEREO indicator output FM front end voltage gain (1) Is Is GV1 VA VD1 VD (MONO/STEREO) output level L, R FM-IF knee level FM-IF distortion L, R (MONO) VIN3=60 dBµV, 10.7 MHz CW OFF Pilot ON VIN1=40 dBµV, 100 MHz CW VA=10.7 MHz CW VIN3=90 dBµV, 10.7 MHz FM detection Min. A 1 kHz 22.5 kHz dev / VD=1 kHz sine wave B VIN3=90 dBµV, 10.7 MHz VD2 VIN3 Input level at –3 dB of 1 kHz A 22.5 kHz dev output A THD1 VD VIN3=90 dBµV, 10.7 MHz 1 kHz 75 kHz dev / B VD=1 kHz sine wave FM-IF distortion L, R (STEREO) FM-IF center frequency ∆F1 VF VIN3=90 dBµV, 10.7 MHz CW IB1 IB VIN3=60 dBµV, 10.7 MHz CW A deviation FM meter current (1) M→ST M/ST switching level by IF input VI1 Is 38 VIN3=10.7 MHz ST→M 35 Auto blend AM front end voltage gain (2) AM-IF voltage gain (4) AM detection output level (L, R) AM meter current (2) VI2 VIN3 GV2 VB GV3 VIN4 VD3 VD IB2 IB THD2 VD (L, R) B VB=455 kHz CW VIN4 level at output of B 15.5 mVrms VIN4=85 dBµV 455 kHz AM detection output distortion VIN2=60 dBµV, 1660 kHz CW B A A A (1 kHz 30 % MOD) / VD=1 kHz sine wave B VIN4=85 dBµV, 455 kHz CW A VIN2=95 dBµV, 1660 kHz A (1 kHz 30 % MOD) VD=1 kHz sine wave 0 dBµV=1 µV —5— —6— 4.7µ 2.2k 0.47µ PILOT DET LPF1 2 PLL LPF 1 29 PLL LPF 30 GND VF 28 MPX REG 5k 10µ 1µ 3 VM 30k S1 B 4 IS 0.01µ A 2k CF1 S2 25 6 Lch OUT MUTE B VD S10 20p 15kHz LPF 19kHz notch filter ID 0.01µ 7 VCC 8 33µ RIPPLE FILTER 9 1µ AGC/ AFC 1 FM OSC 22 10p 15p AFC 23 100k 100µ AM OSC 24 3.3µ 10p S8 7.5k 7.5k A 7.5k 5 Rch OUT FM DISCRI 26 B 100 S9 VCO 27 A PILOT ST IND DET VCO LPF2 CHECK VO Electrical Characteristics Test Circuit 10 AGC/ AFC 2 REG 21 11 GND FM RF 20 10p 4.7µ 30p VH 19 18 13 17 16 FM/AM FE OUT S3 14 VIN 4 AM 455kHz A S4 15 0.01µ 2k 0.01µF AM IF BAND IN SELECT FE GND 10p B 0.01µ FM IF IN VIN 3 FM 10.7MHz IB 12 TUNE IND 25 18p FM RF IN 2200p 150µH VIN 1 FM 100MHz 0.01µ AM RF IN 10p 43p 150 100 VIN 2 AM 1660kHz 330 S6 A 2k B S5 30p VA VS CXA1538M/N/S —7— 1 PLL LPF 28 R3 10k 27 VCO 26 C12 1µ ∗C13 0.022µ 2 R5 2.2k ∗C14 0.022µ 3 4 25 C8 3.3µ R9 100 24 C1 7p L1 ∗R6 3.3k 5 VCC=3V ∗R7 3.3k 6 Lch OUT AFC 23 C7 3p FM OSC 22 C2 2.0p L2 21 REG C3 18p 20 FM RF L3 19 18 17 BPF 16 AM RF FM RF GND FM/AM IN IN FE OUT L4 C4 4PF 7 C15 100µ 8 C16 33µ 9 C17 1µ 10 C18 4.7µ 11 R8 2.2k C19 0.01µ 12 C20 0.01µ CF2 R10 330 14 15 BPF CF1 CF2 CF3 IFT R1 100k CF1 : FM BAND PASS FILTER : AM 455kHz CF : FM 10.7MHz CF : FM DISCRIMINATOR : AM 455kHz IFT IFT Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. 13 S1 R2 2.2k RIPPLE AGC/ AGC/ TUNE FM IF AM IF BAND IN IN SELECT VCC FILTER AFC 1 AFC 2 GND IND FM MUTE AM DISCRI OSC RV 22k CF3 PILOT PILOT ST IND/ DET DET VCO Rch LPF1 LPF2 CHECK OUT MPX REG Capacitor unit : F L ch OUT R ch OUT C10 0.47µ 29 PLL LPF 30 GND C9 10µ C5 C6 0.001µ 10µ Note) This circuit is an application example and is not guaranteed for all applications. For C, R (C13, C14, R6, R7) marked∗, refer to “2. MPX circuit” of “Notes on Usage.” C11 4.7µ R4 2.2k Application Circuit CXA1538M/N/S CXA1538M/N/S FM I/O characteristics 0 SIGNAL (MONO) SIGNAL (STEREO) Separation/response (dB) –10 VCC FREO MODE DEV –20 3V 98MHz 400Hz 22.5kHz –40 L→R R→L SEPARATION Distortion THD1 (%) –30 5 4 –50 3 NOISE(MONO) –60 NOISE(STEREO) (WITH LPF) 2 1 DISTORTION(MONO) 10 20 30 40 50 60 70 80 90 100 110 Input signal level (dBµV) AM I/O characteristics 0 SIGNAL VCC 3V FREO 1000kHz MOD 400Hz, 30% –20 –30 –40 5 NOISE 4 –50 3 2 DISTORTION 1 –60 10 20 30 40 50 60 70 80 Input signal level (dBm) 90 100 Distortion THD2 (%) Response (dB) –10 110 79 VCO - free-running frequency (kHz) Separation (dB) 45 40 Vin3=90dBµV 10.7MHz Vin3=90dBµV 10.7MHz CW 78 77 76 75 fmod = 1kHz 22.5kHz dev Pilot ON 73 74 75 76 77 78 79 0 VCO - free-running frequency (kHz) 20 40 60 Ta - Ambient temperarure (°C) —8— 80 CXA1538M/N/S Coil data AM OSC S Core diameter ø 0.06 mm 2 UEW 3 4 2 5 f (kHz) 1 6 796 L (µH) 1 to 3 270 QO 1 to 3 125 Number of widings (t) 1 to 3 4 to 6 107 29 Equivalent to L-5K7H5 R12-1684X, Mitsumi Electric Co., Ltd. or 7TRS-8441 TOKO Co., Ltd. FM RF φ 5mm φ 6mm3.5t AM IFT 3 S Core diameter ø 0.07 mm UEW 4 2 5 1 6 CO (pF) 1 to 3 180 QO 1 to 3 90 Number of widings (t) 1 to 2 2 to 3 4 to 6 111 35 7 Equivalent to 21K7H5 R12-8558A, Mitsumi Electric Co., Ltd. or 7MC-7789N TOKO Co., Ltd. FM OSC φ 4mm φ 0.6mm3.5t FM Discriminator Core diameter ø 0.1 mm 2 UEW 3 4 2 5 1 6 CO (pF) 1 to 3 82 QO 1 to 3 95 Number of widings (t) 1 to 3 111 Equivalent to 119ASC-12200Z, TOKO Co., Ltd. AM Bar Antenna f (kHz) 796 PRIMARY L (µH) 650 Primary 91 t Secondary 20 t SECONDARY BPF CF1 CF2 CF3 VC VC (Rear Mount) PFWE8 (88 to 108 MHz) Soshin Electric Co., Ltd. SFU-455B SFE10.7MA5 CDA10.7MG1 PVC2LXT16L HU22124N700 PVC2LXT16B Murata Mfg. Co., Ltd. or BFCFL-455 Murata Mfg. Co., Ltd. Murata Mfg. Co., Ltd. Mitsumi Electric Co., Ltd. TOKO Co., Ltd. Mitsumi Electric Co., Ltd. —9— TOKO Co., Ltd. CXA1538M/N/S Notes on Usage 1. VCO free run frequency adjustment method As this IC has built-in oscillation capacitance, the oscillation frequency can be controlled with an external resistor. 27 28 10k Capacitor for decoupling 22k 1) VCO Adjustment Method Pin 4 is the stereo indicator and VCO check pin. Therefore, in stereo mode (when stereo indicator drive Tr Q2 is switched on), pin 4 voltage lowers down, Q1 is cut off and VCO oscillation waveform can not be seen. In AM mode as well, the oscillation waveform can not be seen as VCO turns off. Adjust the free run frequency at 76 kHz ±50 Hz. VCC 33k 4 Q1 about 180mVp-p Q2 In this IC, tuner and MPX sections are directly connected. Therefore, free run frequency is not stable, being affected by noise except in reception mode. For free run adjustment, input signals from either RF or IF. (Input signal should be RF [Tuning frequency] or fo of the discriminator using IF (10.7 MHz) and input more than 60 dBµ.) 2) How to Deal with pin 4 After Adjustment. With the use of a stereo indicator. When VCC is 3 V or more, insert a bypass resistance R to prevent LED malfunction. VCC=3V 2.2k 2.2k 4 4 R Without the use of a stereo indicator. 4 VCC>3V OPEN Turn pin 4 to open or connect to GND. 4 3) Control Resistor of VCO Oscillation Frequency For the VCO control resistor of this iC, a carbon film resistor suffices. For easier adjustment of temperature characteristics and VCO free run frequency, the following combination is recommended. 27 28 10k 22k —10— CXA1538M/N/S 2. MPX circuit 1) MPX load resistance When power supply voltage is over 3 V, change the MPX load resistor R6, R7 from 3.3 kΩ to 6.8 kΩ. In this case, the output level is increased by about 6 dB. 2) Time constant of de-emphasis Refer to the following table as the time constant is determined at C13, C14, R6 and R7. 3.3 kΩ 0.015 µF 0.022 µF 50 µs 75 µs 6.8 kΩ 0.0082 µF 0.012 µF R6, R7 C13, C14 3. AFC circuit 1) This IC has a built-in variable capacitances. Change to the following circuit when designing J band, because the standard circuit is for W band. 3pF 23 22 9 10 150k 4.7µ 1µ 1µ 2) AFC pull-in range is expanded by increasing the capacitance of standard circuit C7 3 pF. Adjust the value of capacitance according to the set specification. 4. Auto blend circuit This IC has a built-in auto blend circuit and a MONO switch is not required as a rule. This circuit controls the separation in proportion to the signal level and reduces noise automatically for stereo reception below the mid electric field when the electric field strength reaches lower than about 40 dBµ. When the electric field strength turns below 10 to 15 dBµ, MONO operation is automatically activated. To switch MONO mode on externally, ground pin 3 with 33 kΩ. 2 3 33k MONO SW —11— CXA1538M/N/S 5. FM discriminator For FM detection, the quadrature detection system is adopted. As a phase shifter, a ceramic resonator (CF 3 discriminator) applies to achieve adjustment-free detection. Though the sensitivity and selectability will be slightly affected, the discriminator can be replaced by a coil as shown below. Combining CF2 (FMIF) and CF3 (PM discriminator) poses problems with the distortion factor when deviation with the IF band central frequency fo occurs. To this effect, use pairs of the same rank as indicated in the chart. A B C D E Red Blue Orange Black White fO of CF2 and CF3 10.70 MHz 10.67 MHz 10.73 MHz 10.64 MHz 10.76 MHz 26 22pF DISCRI COIL 6. FM muting circuit This IC has a built-in soft muting circuit. As shown in the following I/O characteristics diagram, 23 dB (Typ.) muting is applied and noise level reduced during weak electric field and out of tune instances. RESPONSE (dB) Conventional IC 3 S+N IC with built-in soft MUTE –23 N INPUT LEVEL (dBµ) 7. Notes on patterns 1) Positions of FM ANT and OSC coils Locate those at right angles to each others to avoid inductance M through coupling. Further, insert a pin 21 pattern between patterns of pins 22, 20 and coils. 2) Tuning circuit As the capacitances C1 to C4, L2 and L3 are the constants on the standard circuit board, check the constants when a new circuit board is used. 3) Grounding pins Pin 17 is a grounding pin for AM, FM and FE ; pin 11 for IF ; and pin 30 for MPX. Use as thick as possible a pattern since the grounding between ANT IN, BPF and pin 17 significantly stability, NF and characteristics affects. BPF 18 17 ANT IN 16 4) Ground bypass capacitors C5 (0.001 µF) and C6 (10 µF) connected to pin 21 as close as possible to pin 17. —12— CXA1538M/N/S CXA1538M CXA1538S —13— CXA1538M/N/S Package Outline Unit : mm CXA1538M 30PIN SOP(PLASTIC) + 0.4 2.3 – 0.15 + 0.4 18.8 – 0.1 0.1 30 + 0.2 0.1 – 0.05 (9.3) A 0.5 ± 0.2 10.3 ± 0.4 + 0.3 7.6 – 0.1 16 15 1 + 0.1 0.2 – 0.05 1.27 0.45 ± 0.1 0.2 M 0° to 10° DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SOP-30P-L03 LEAD TREATMENT SOLDER PLATING EIAJ CODE SOP030-P-0375 LEAD MATERIAL COPPER ALLOY PACKAGE MASS 0.7g JEDEC CODE CXA1538N 30PIN SSOP (PLASTIC) + 0.2 1.25 – 0.1 ∗9.7 ± 0.1 1 + 0.1 0.22 – 0.05 7.6 ± 0.2 16 ∗5.6 ± 0.1 30 0.10 A 15 + 0.05 0.15 – 0.02 0.65 0.13 M 0.5 ± 0.2 0.1 ± 0.1 0° to 10° NOTE: Dimension “∗” does not include mold protrusion. DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SSOP-30P-L01 LEAD TREATMENT SOLDER/PALLADIUM PLATING EIAJ CODE SSOP030-P-0056 LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.1g JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —14— CXA1538M/N/S CXA1538S + 0.1 05 0.25 – 0. 30PIN SDIP (PLASTIC) + 0.4 26.9 – 0.1 30 + 0.3 8.5 – 0.1 10.16 16 0° to 15° 15 1 + 0.4 3.7 – 0.1 0.5 MIN 1.778 0.5 ± 0.1 3.0 MIN Two kinds of package surface: 1.All mat surface type. 2.All mirror surface type. 0.9 ± 0.15 PACKAGE STRUCTURE MOLDING COMPOUND EPOXY RESIN SONY CODE SDIP-30P-01 LEAD TREATMENT SOLDER/PALLADIUM PLATING EIAJ CODE SDIP030-P-0400 LEAD MATERIAL COPPER ALLOY PACKAGE MASS 1.8g JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —15—