cxa1238

Description

The CXA1538M/N/S is high performance one-chipbipolar ICs designed for FM stereo/AM radios.These include an FM/AM front end, FM/AM IFamplifier, FM/AM detection output and FM stereodemodulator output.

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

Absolute Maximum Ratings(Ta=25 °C)•Supply voltageVCC14V•Operating temperatureTopr–10 to +60°C•Storage temperatureTstg–55 to +150°C•Junction temperatureTjmax125°C•Allowable power dissipation

PDCXA1538M500mW

CXA1538N410mWCXA1538S1050mW

CXA1538M

30 pin SOP (Plastic)

CXA1538S

30 pin SDIP (Plastic)

CXA1538N

30 pin SSOP (Plastic)

Recommended Operating ConditionsSupply voltageVCC2 to 9Structure

Bipolar silicon monolithic IC

V

Block Diagram

GND30PLLLPF 229MPXREG28VCO27FM

DISCRIMUTE2625AMOSC24AFC23FMOSC22REG21FMRF20AM RFFM RFININ1918FM/AMFE

GNDFE OUT1716VCOMULTIPLEXREGULATORREGULATORFM FEAM FEPD 11/2 COUNTERPD 2MUTINGDCAMPAUTOBLENDFM IF/DISCRIBUAMPDECODE AMPM/STSWBUAMPAM IF/DETSTINDRIPPLE FILTERDCAMPDETUNEMUTINGCONTROLTUNING IND1PLLLPF1

2PILOTDETLPF2

3PILOTDETLPF2

4STINDVCOCHECK

5RchOUT

6LchOUT

7VCC

10AGCAFC 2

11GND12TUNEIND

13FM IFIN

1415RIPPLEAGCFILTERAFC 1AM IFBANDINSELECTDET : DETECTORIND : INDICATOR

PD : PHASE DETECTORBU : BUFFERFE : FRONT END

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license byany implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating theoperation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

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E93313D8X

CXA1538M/N/S

Pin Description and Equivalent CircuitNo.SymbolPin Voltage (V)VCC=3 VVCC=6 VFMAMFMAMEquivalent circuitDescription1PLL LPF10.970.970.970.97MPX REG26k26kLPF for PLL29129PLL LPF22PILOTDET LPF1PILOTDET LPF20.950.950.950.9532LPF’s C (1µF) for PILOT DETinserted between pins 2 and 330.950.950.950.95MPX REG4ST INDVCO CHECK1.61...56k4Stereo indicator drive circuitand output for VCO checkVCO5RchOUT0.660.661.51.556Stereo Rch output pin67Lch OUTVCC0.660.661.51.53.03.06.06.017kStereo Lch output pinSupply pin8RippleFILTER17k140k33k2.72.74.04.08Ripple filter9AGC/AFC11.321.151.321.1522k3.25k950k10AGC/AFC21.151.471.151.4725k10AFC pin in J band, determines timeconstant of AGC in AM (depending onexternal capacitor).AFC pin in W band, determines timeconstant of AGC in AM (dependingon external capacitor).—2—

CXA1538M/N/S

No.SymbolPin Voltage (V)VCC=3 VVCC=6 VFMAMFMAM0000Equivalent circuitDescription11GND25GND of FM/AM IF and DETstageTime constant for mutingprovided25MUTE0.050.010.050.011112TUNE IND1.61...512FM/AM tuning indicator drivecircuit13FM IF IN1.3501.3501533C133kFM IF input pin15BANDSELECTFM/AM band switching pin :AM at GND and FM at OPEN14AM IF IN0000141k2kAM IF input pinAM BlockFM Block16FM/AMFE OUIT0.570.20.80.222016AM/FM IF output pin toconnect with IF filter171820FE GNDFM RF INFM RF00.30000.30203pGND of FM/AM front endFM RF amplifier circuit for FMRF inputFM RF amplifier circuit toconnect to RF tank circuitFE REG0181k171.251.251.251.2519AM RF IN1.251.251.251.2519GNDAM RF input to connect to barantenna—3—

CXA1538M/N/S

No.SymbolPin Voltage (V)VCC=3 VVCC=6 VFMAMFMAMEquivalent circuitDescription21REG21Regulator output1.251.251.251.25231.25VREG23AFCVariable capacitance for AFC2222FM OSC1.251.251.251.25REGFM local oscillation circuit2424AM OSC1.251.251.251.25REGAM local oscillation circuit2626FM DISCRI2.302.703.604.001kPhase shift circuit to connectto ceramic discriminator27VCO2728MPX REGVCO control pin for stereodemodulation28MPX REG1.651.651.651.65Regulator for MPX30GND000030GND of MPX block—4—

CXA1538M/N/S

Electrical Characteristics

ItemCircuit current (1)Circuit current (2)SeparationSymbolID1ID2SEPTestPointIDIDVDOutput waveformand Test methodAM no signalFM no signalV1toV5inputshort1A2AAB/BONAA/OFFOFFAB3ASW condition4BA5A6B8OFF9A10OFF(Ta=25 °C, VCC=6 V)

Min.5.07.030Typ.8.511.040Max.12.015.0—UnitmAmAdBSeparation when VIN3=50 dBµV, 10.7 MHz, 1 kHz,22.5 kHz dev inputAttenuation of noise levelFM MUTESTEREOindicator outputFM front endvoltage gain (1)A1VDWhen VIN3=no signal,S8ON/OFFIsGV1IsVAVIN3=60 dBµV, 10.7 MHz CWPilot ONVIN1=40 dBµV, 100 MHz CWVA=10.7 MHz CW162330dB1.8283.0355.042mAdBFM detection(MONO/STEREO)output level L, RVD1VDVIN3=90 dBµV, 10.7 MHz1 kHz 22.5 kHz devVD=1 kHz sine waveA/BB35.077.5138mVrmsFM-IFknee levelFM-IF distortionL, R (MONO)FM-IF distortionL, R (STEREO)FM-IF centerfrequencydeviationFM metercurrent (1)M/ST switchinglevel by IF inputAuto blendAM front endvoltage gain (2)AM-IFvoltage gain (4)AM detectionoutput level (L, R)AM metercurrent (2)AM detectionoutput distortion(L, R)VIN3=90 dBµV, 10.7 MHzVD2VIN3Input level at –3 dB of 1 kHz22.5 kHz dev outputATHD1VDVIN3=90 dBµV, 10.7 MHz1 kHz 75 kHz devVD=1 kHz sine wave/B0.12.0%—0.12.0%A—2531dBµV∆F1VFVIN3=90 dBµV, 10.7 MHz CWA–500+50kHzIB1IBVIN3=60 dBµV, 10.7 MHz CW1.8M→ST3.3411024217.048412829mAdBµVdBµVdBdBdBµVVI1IsVIN3=10.7 MHz38ST→M351VI2GV2GV3VIN3VBVIN4VIN2=60 dBµV, 1660 kHz CWVB=455 kHz CWVIN4level at output of15.5 mVrmsVIN4=85 dBµV 455 kHzA/BA(1 kHz 30 % MOD)VD=1 kHz sine waveBBBAA1915VD3VD35.077.5138mVrmsIB2IBVIN4=85 dBµV, 455 kHz CWVIN2=95 dBµV, 1660 kHz1.33.07.0mATHD2VD(1 kHz 30 % MOD)VD=1 kHz sine waveA—0.62.0%0 dBµV=1 µV

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Electrical Characteristics Test CircuitVIN 2AM 1660kHz10015043pVHS820p100k2k25MUTEAMOSCAFCFMOSCREGFMRFAM RFINFM RFIN2423222120191817FEGND3.3µ10p10p10p10p16FM/AMFE OUT30p2200p15p30p2k10p18p0.01µFS6VA33010µA5k27VCOFMDISCRI26B100S9CF125150µHVIN 1FM 100MHz0.01µVFVO302928GNDPLLLPFMPXREG—6—

RchOUTVCC7100µ33µ0.01µ0.47µ2.2k4.7µLchOUTRIPPLEFILTER81µ910AGC/AFC 1AGC/AFC 2S2A7.5k7.5kS10PLLLPF4S1BA0.01µPILOTDETLPF15BID6PILOTST INDDETVCOLPF2CHECKGND11TUNEIND12FM IFIN13AM IFBANDINSELECT14S44.7µIBS3B0.01µA0.01µA15S5B2kVS1231µVM30k7.5k15kHz LPF19kHznotchfilterVDISVIN 3FM 10.7MHzVIN 4AM 455kHzCXA1538M/N/S

RETLRIFO T1SFCSFFAACCNT IFP zI zHM IzDHNMRCHA5k75.S5kIB401T DFMM MMMIFAFFA :::::F12310kPFFFTR0BCCCFI12k1R2.2SMTDTC61AUNE5/MO AL1FEFBES0µ21FFP7DIC0. N02B1NGM4I1FA0CF10FR338RI 1MNIMN3I1FF9µ4F4F11CP4LE9RD1 NC0.N20MNIU1IAT38LDR2k.202MFNFRG113p8µC82171/ 1GCC.42ECRG0FA2pA172C011µ./L2 2MCCCC12FSGF96µOAA6C01R1µEEC37L33CµCp32FPT51AP8LII5µC00RF10.110C0LCp74MCC12ASCV7OEV35ThTcU=µ2ULO6C7kC83MC.90R3.V3R0I1R∗36MChTc32FSIRUFO56kCVkD/R22DKR3.7ONOC∗32CI CE4VTVH3kSC5k4µR01TR2.8XT2212OC202PGMELEF∗.RI0PDP3L9µ2F3µ :C01T1µ12 t9LFOT1C1C2i0n2LPPLEF∗.LI0u PDP2LrotiDLFc0La3NGPPpL1aµT07UTC14OUC. O0h ch cR Lk1µ4217R.2C.4—7—

CXA1538M/N/S

rof ytil.ibeismnaos potes re uedm tuhsgir asr etohtnon adcn a tnynoeSt a.sp ”e.ctyreiagevp add rseiUhhtt f nfoo o tn nsoeietmtaeoregNpnir“of nfeioh y t” ntgai unrictaofrr ritcso uXlltsiiP sucMerli pc .2me“a xesoehtt l fraoec iefepysurt ,ee∗rhtda feno kwtrouaho ms gn i)tsis7uirRarc i s,c6 nmRoeli tb,ao4cri1lp Cppyn ,Aa31C( R ,C roFApplication CircuitNote)This circuit is an application example and is not guaranteed for all applications.CXA1538M/N/S

FM I/O characteristics

0

SIGNAL (STEREO)–10Separation/response (dB) VCCFREOMODEDEV3V98MHz400Hz22.5kHzSIGNAL (MONO)–20–30–40Distortion THD1 (%)Distortion THD2 (%)60

L → RR → LSEPARATION321–50NOISE(MONO)NOISE(STEREO) (WITH LPF)–60102030DISTORTION(MONO)405060708090100110Input signal level (dBµV)AM I/O characteristics

0

SIGNALVCC3VFREO1000kHzMOD400Hz, 30%–10Response (dB) –20–30–40NOISE3

–50DISTORTION21

100

110

–6010

20

30

40

50607080Input signal level (dBm)

79VCO - free-running frequency (kHz)90

45

Vin3=90dBµV 10.7MHz CW78

Separation (dB)77

40

Vin3=90dBµV 10.7MHz76

75

fmod = 1kHz 22.5kHz devPilot ON737475767778790204080

VCO - free-running frequency (kHz)Ta - Ambient temperarure (°C)

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CXA1538M/N/S

Coil dataAM OSC

321SCore diameter ø 0.06 mm 2 UEW

456f (kHz)796

L (µH)1 to 3270QO1 to 3125Number of widings (t)1 to 34 to 610729

FM RFφ 5mm

φ 6mm3.5t

Equivalent to L-5K7H5 R12-1684X, Mitsumi Electric Co., Ltd. or7TRS-8441 TOKO Co., Ltd.

AM IFT

321SCore diameter ø 0.07 mm UEW

456CO(pF)1 to 3180QO1 to 390Number of widings (t)1 to 22 to 34 to 6111357

FM OSCφ 4mm

φ 0.6mm3.5t

Equivalent to 21K7H5 R12-8558A, Mitsumi Electric Co., Ltd. or7MC-77N TOKO Co., Ltd.

FM Discriminator

321456Core diameter ø 0.1 mm 2 UEWCO(pF)1 to 382

QO1 to 395

Number of widings (t)1 to 3111

Equivalent to 119ASC-12200Z, TOKO Co., Ltd.

AM Bar Antenna

f (kHz)796

SECONDARY

PRIMARYL (µH)650Primary91 tSecondary

20 t

BPF

CF1CF2CF3VC

VC (Rear Mount)

PFWE8

(88 to 108 MHz)SFU-455BSFE10.7MA5CDA10.7MG1PVC2LXT16LHU22124N700PVC2LXT16B

Soshin Electric Co., Ltd.

Murata Mfg. Co., Ltd. or BFCFL-455Murata Mfg. Co., Ltd.Murata Mfg. Co., Ltd.Mitsumi Electric Co., Ltd.TOKO Co., Ltd.

Mitsumi Electric Co., Ltd.

—9—

TOKOCo., 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 externalresistor.

2710kCapacitor for decoupling22k281)VCO Adjustment Method

Pin 4 is the stereo indicator and VCO check pin. Therefore, in stereo mode (when stereo indicator driveTr Q2 is switched on), pin 4 voltage lowers down, Q1 is cut off and VCO oscillation waveform can not beseen. 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.

33k4Q1Q2about 180mVp-pVCC

In this IC, tuner and MPX sections are directly connected. Therefore, free run frequency is not stable, beingaffected 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 inputmore than 60 dBµ.)

2)How to Deal with pin 4 After Adjustment.With the use of a stereo indicator.

VCC=3V

4RWhen VCCis 3 V or more, insert a bypass resistanceR to prevent LED malfunction.

2.2kVCC>3V

42.2kWithout the use of a stereo indicator.

4OPEN4Turn pin 4 to open or connect to GND.

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 followingcombination is recommended.

2710k2822k—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 kΩto 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 kΩ0.015 µF0.022 µF

6.8 kΩ0.0082 µF0.012 µF

R6, R7C13, C14

50 µs75 µs

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.

3pF232291µ10150k4.7µ1µ2)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 controlsthe separation in proportion to the signal level and reduces noise automatically for stereo reception belowthe mid electric field when the electric field strength reaches lower than about 40 dBµ. When the electricfield strength turns below 10 to 15 dBµ, MONO operation is automatically activated.To switch MONO mode on externally, ground pin 3 with 33 kΩ.

2333kMONOSW—11—

CXA1538M/N/S

5.FM discriminator

For FM detection, the quadrature detection system is adopted. As a phase shifter, a ceramic resonator (CF3 discriminator) applies to achieve adjustment-free detection. Though the sensitivity and selectability will beslightly affected, the discriminator can be replaced by a coil as shown below. Combining CF2 (FMIF) andCF3 (PM discriminator) poses problems with the distortion factor when deviation with the IF band centralfrequency fo occurs. To this effect, use pairs of the same rank as indicated in the chart.

fOof CF2 and CF3

10.70 MHz10.67 MHz10.73 MHz10. MHz10.76 MHz

ABCDERedBlueOrangeBlackWhite

2622pFDISCRICOIL6.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 levelreduced during weak electric field and out of tune instances.

Conventional ICRESPONSE (dB)3–23S+NIC with built-in soft MUTENINPUT 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 pin21 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 theconstants 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 aspossible a pattern since the grounding between ANT IN, BPF and pin 17 significantly stability, NF andcharacteristics affects.

BPFANTIN

18171)Ground bypass capacitors C5 (0.001 µF) and C6 (10 µF) connected to pin 21 as close as possible to pin17.

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CXA1538M

CXA1538S

CXA1538M/N/S

—13—

CXA1538M/N/S

Package Outline Unit : mm

CXA1538M

+ 0.418.8 – 0.1301630PIN SOP(PLASTIC)

+ 0.42.3 – 0.150.110.3 ± 0.4+ 0.37.6 – 0.1+ 0.20.1 – 0.05(9.3)1510.45 ± 0.10.2M1.27+ 0.10.2 – 0.050° to 10°DETAILA

PACKAGE STRUCTURE

PACKAGE MATERIAL

SONY CODEEIAJ CODEJEDEC CODE

SOP-30P-L03SOP030-P-0375

LEAD TREATMENTLEAD MATERIALPACKAGE MASS

EPOXY RESINSOLDER PLATINGCOPPER ALLOY0.7g

CXA1538N

∗9.7 ± 0.130PIN SSOP (PLASTIC)

+ 0.21.25– 0.10.103016∗5.6 ± 0.11+ 0.10.22 – 0.050.13M150.65+ 0.050.15– 0.020.1 ± 0.10° to 10°NOTE: Dimension “∗” does not include mold protrusion.

DETAIL A

PACKAGE STRUCTURE

PACKAGE MATERIAL

SONY CODEEIAJ CODEJEDEC CODE

SSOP-30P-L01SSOP030-P-0056

LEAD TREATMENTLEAD MATERIALPACKAGE MASS

EPOXY RESINSOLDER/PALLADIUM

PLATING42/COPPER ALLOY0.1g

NOTE : PALLADIUM PLATING

This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).

—14—

0.5 ± 0.27.6 ± 0.2A0.5 ± 0.2ACXA1538M/N/S

CXA1538S

30PIN SDIP (PLASTIC)

+ 0.426.9 – 0.13016+ 0.38.5 – 0.1+ 0.1.050.25 – 011.778150.5 MIN+ 0.43.7 – 0.110.160° to 15°Two kinds of package surface:

1.All mat surface type.2.All mirror surface type.

0.5 ± 0.10.9 ± 0.153.0 MINPACKAGE STRUCTURE

MOLDING COMPOUND

SONY CODEEIAJ CODEJEDEC CODE

SDIP-30P-01SDIP030-P-0400

LEAD TREATMENTLEAD MATERIALPACKAGE MASS

EPOXY RESIN

SOLDER/PALLADIUM

PLATINGCOPPER ALLOY1.8g

NOTE : PALLADIUM PLATING

This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).

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