BA1451

BA1451F Audio ICs AM radio / FM IF stereo system IC BA1451F The BA1451F is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX. It has been developed for HiFi component applications. The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes. In particular, the laser lock technique used in the VCO means that no external adjustment is required. !Applications Synthesized tuner for HiFi components. !Features 1) Built-in AM monaural radio, FM IF amplifier/detector, and FM stereo demodulator. 2) DTS (both SD and IF count) compatible. 3) Built-in reference voltage power supply provides good shortwave band frequency stability. 4) Good FM stability. 5) The FM MPX VCO uses laser locking making adjustment and external components unnecessary. 6) Built-in forced monaural operation function for MPX (VCO stops, and LED goes off). 7) Low cutoff of audio is possible to improve AM fidelity. 8) MPX VCO stops in AM mode. 9) Audio muting is possible when an IF request is made. !Block diagram 24 23 22 21 20 19 18 17 16 15 14 13 AM OSC Vreg AM MIX AM IF SD AM DET AGC 1/2 SW PD FM IF Vcc 1 2 FM DET SD DET 3 GND 4 5 6 7 8 9 10 11 12 VCO 1/2 LED DRIVER DECODER COMP BA1451F Audio ICs !Absolute maximum ratings Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 9.0 450∗ 1 Unit V mW ˚C ˚C −25∼+75 −55∼+125 ∗ 1 Reduced by 4.5mW for each increase in Ta of 1˚C over 25˚C. !Recommended operating conditions (Ta=25°C) Parameter Power supply voltage Symbol VCC Min. 3.8 Typ. 5.0 Max. 8.0 Unit V !Input and output circuits Pin No. Function VCC 2 Vreg 23 Internal circuit Quiescent voltage (V) FM AM 1 FM IF amplifier input Connect to an FM ceramic filter. 1 330Ω 2.1 2.1 GND 4 2 VCC 3 VCC 2 5.0 5.0 FM tuning ON level adjustment 3 Connect a resistor from this pin to GND to set the required ON level for the tuning indicator. GND 4 0.25 15kΩ 0 4 GND 5 VCC 2 0 0 5 FM discriminator Connect to the discriminator coil. 5.0 5pF 5.0 GND 4 6 Tuning indicator Connect to a tuning indicator display device (eg. LED) Stereo indicator Connect to a stereo indicator display device (eg. LED) 6/7 − − 7 GND 4 − − BA1451F Audio ICs Pin No. Function · IF request Output the IF signal to pin9 excess of 4.0V. Stops the IF signal at equal to or less than 3.0V. · MUTE Apply to muting excess of 2.0V. Off the muting at equal to or less than 1.0V. 10kΩ Internal circuit MUTE 10kΩ IF OUT Quiescent pin voltage (V) FM AM 8 8 0 0 GND 4 VCC 2 9 IF output Output for the IF signal. 9 4.2 4.2 GND 4 VCC 2 10 R-channel output 1.5 1.5 10/11 11 5kΩ L-channel output GND 4 1.5 1.5 12 · PLL filter Connect to a lag/lead filter. 82kΩ Vreg 23 12 · AM / FM band switch AM band when connected to GND. GND 4 AM/FM 2.1 0 13 · Forced monaural Forced monaural operation connecting to get a resistor to mediate. (Recommended value : 10kΩ to ground.) · Pilot filter Connect to a capacitor. 13 Vreg 23 4kΩ MONO 2.1 2.1 GND 4 BA1451F Audio ICs Pin No. Function Internal circuit Quiescent pin voltage (V) FM AM MPX input 14 Input the FM detector output . VCC 2 100kΩ 20kΩ 2.1 2.1 Vreg 23 14 MPX input 15 15 Input the AM detector output after low cut. 2.1 GND 4 2.1 VCC 2 AM/FM detector output 16 Connect to the following stage MPX and FM low pass filter. GND 4 5kΩ 16 2.1 2.1 17 VCC 2 AM AGC 17 Connect to a capacitor. 20kΩ 0 0 GND 4 VCC 2 18 3kΩ AM IF input 18 Connect to an AM ceramic filter. 5.0 5.0 GND 4 19 AM mixer output VCC 2 Vreg 23 19 Connect to primary side of AM IFT. 5.0 30kΩ 5.0 20 AM antenna 20 Connect to AM antenna. GND 4 2.1 2.1 BA1451F Audio ICs Pin No. Function Internal circuit 21 VCC 2 Quiescent pin voltage (V) FM AM FM detector bandwidth adjustment 21 Connect a resistor from this pin to the reference voltage supply to set the required detector bandwidth. GND 4 2.1 4.3kΩ 2.1 23 Reference voltage supply Connected to a capacitor. AM local oscillator 2.1 2.1 22 Connect to the AM OSC circuit. 100Ω 22 Vreg 23 2.1 2.1 24 AM local oscillator output 24 AM OSC output. GND 4 1.7 1.4 !Electrical characteristics (Unless otherwise specified, Ta=25°C and VCC=5V) FM IF MPX signal source : fiN=10.7MHz, modulation 1kHz, 75kHzdev (100%) 19kHz 7.5kHzdev (10%) AM : fiN=1000kHz, modulation 1kHz 30% Parameter Quiescent current FM Quiescent current AM Detector output voltage −3dB limiting sensitivity Signal-to-noise ratio Channel balance AM suppression ratio Channel separation Total harmonic distortion Station detector sensitivity Station detector bandwidth IF OUT output voltage Detector output voltage Usable sensitivity Signal-to-noise ratio Total harmonic distortion Station detector sensitivity IF OUT output voltage Local buffer output voltage Symbol I Q (FM) I Q (AM) VO L.S S/N C.B AMR SEP THD SDS SDSW VIF VO Q.S S/N THD SDS VIF VOBuff Min. 13 11 340 34 72 −2 45 35 − 34 70 300 70 22 42 − 21 300 140 Typ. 21 19 480 37 80 0 55 45 0.5 39 100 400 90 25 52 0.6 26 400 200 Max. 29 27 670 40 − +2 − − 1.6 44 150 530 120 28 − 1.8 31 530 280 Unit mA mA mVrms dBµV dB dB dB dB % dBµV kHz mVP-P mVrms dBµV dB % dBµV mVP-P mVrms Conditions No input No input VIN=100dBµV,mono mono VIN=100dBµV, mono VIN=100dBµV, mono AM : V IN=60dBµV, mod=30% , 400Hz VIN=100dBµV, main VIN=100dBµV, main Input for pin 6 current ≥ 1mA VIN=100dBµV, mono IF request ON VIN=68dBµV Input for S / N = 20dB VIN=68dBµV VIN=68dBµV Input for pin 6 current ≥ 1mA IF request ON BA1451F Audio ICs !Test circuit L4 47p 0.022 100 OSC OUT 20k 0.022 AM SG SG OSC MIX DET 0.022 24 23 Vreg 22 21 20 19 18 17 16 15 14 13 100 6800p 1 22 50 100p MONO 10 10k AM STEREO T2 STEREO Vreg MPX SD DET LED MUTE REQ. 1 2 Vcc 0.022 3 GND 4 5 6 7 8 9 10 11 12 FM SG FM STEREO SG SG SG 1 50 100 0. 022 24k 3.9k TUN. ST. OFF IFREQ MUTE 0.01 0.01 0.022 0.22 AM FM 3.3k +B IF OUT R-ch L-ch 0.047 L4 : AM OSC T2 : AM IFT CD1 : FM DISCRIMINATOR COIL Sumida Toko Toko Sumida Toko 2157-JPS-029 A7BRS-12445X CFMA-258 0236-JPS-101 A119ACS-19197N Units : R [Ω] C [µF] Fig. 1 BA1451F Audio ICs !Application example 24 8 7 6 5 23 22 21 20 19 18 17 16 15 14 13 SD / MONO OSC Vreg OUT AM BW Adj AM IN MIXOUT IFIN AGC DET MPX MPX OSC AM AM OUT IN IN BA4425F 1 BPF BA1451F 4 FMIN 1 VDD SD Adj GND FM DET TUN 2 3 4 5 6 MUTE / ST IF REQ IF OUT 7 8 9 PD / AMFM 12 2 3 Rch 10 Lch 11 Vcc (5V) Lch OUT Rch OUT 18 17 16 PD1 15 14 13 12 P2 11 P1 10 P0 GND PD2 Vcc2 (+9V) XOUT 1 XIN 2 VDD FMIN AMIN BU2616F CE 3 DA 4 CL 5 TUN 6 SD 7 IFIN 8 P3 9 CE DA CL TUNING TO LED etc. STEREO µ-COM Fig. 2 !Electrical characteristic curves TOTAL HARMONIC DISTORTION : THD (%) 160 150 140 −3dBL, S, TUNED ON (dBµ) SEP (dB) 0 −10 Vo, AMR, SEP (dB) S+D+N 90 80 70 60 50 40 30 20 10 0 TOTAL HARMONIC DISTORTION : THD (%) 180 170 110 100 11 10 9 8 7 6 5 4 3 2 1 0 3 4 5 6 D+N (100%) D+N (30%) 7 8 9 R→L VO 7 6 5 4 3 2 1 0 −20 −30 −40 Vcc=5V, −50 fIN=10.7MHz, fm=1kHz −60 ∆f=±22.5kHzdev, −70 pilot=±7.5kHzdev Ta=25˚C, −80 AMR MOD=30%, fm=400Hz −90 −20 20 40 0 AMR R→L SEP L→R Vo (mVrms) 130 120 110 100 L→R TUNED ON −3dB L.S. fIN=10.7MHz, VIN=100dBµ, ∆f=±22.5kHzdev. (pilot=±7.5kHzdev) fIN=1kHz, Ta=25˚C, RSD=20kΩ N D+N (100%) D+N (30%) 60 80 100 120 90 80 70 INPUT VOLTAGE : VIN (dBµ) POWER SUPPLY VOLTAGE : VCC (V) Fig.3 FM input / output characteristics Fig.4 FM characteristics vs. power suppy voltage BA1451F Audio ICs 10.80 TOTAL HARMONIC DISTORTION : THD (%) 60 SEP CHANNEL SEPARATION : SEP (dB) FM BAND WIDTH : fIN (MHz) 10.75 2 50 L→R 40 R→L 10.70 30 10.65 1 20 10.60 RBW=20kΩ, VIN=100dBµ Ta=25˚C 10.55 3 4 5 6 7 8 9 10 Vcc=5V fIN=10.7MHz VIN=100dBµ ∆f=±22.5kHzdev pilot=±7.5kHzdev Ta=25˚C THD 50 100 200 500 1k 2k MAIN R L SUB MONO 0 0 5k 10k 20k POWER SUPPLY VOLTAGE : Vcc (V) FREQUENCY : fm (Hz) Fig.5 FM bandwidth vs. power supply voltage Fig.6 Channel separation and THD vs. frequency TOTAL HARMONIC DISTORTION : THD (%) 10 100 10 TOTAL HARMONIC DISTORTION : THD (%) 100 90 OUTPUT VOLTAGE : Vo (mVrms) S+D+N 0 3.0 90 80 Q.S. , TUNED ON : (dBµ) 9 8 7 6 5 4 3 2 1 0 OUTPUT VOLTAGE : VO (dB) Vo −10 80 70 60 50 40 30 20 10 D+N (30%) 0 3 4 5 6 7 8 9 Q.S. S / N=20dB VAGC −30 −40 −50 fIN=1000kHz, −60 MOD=30%, Ta=25˚C fm=1kHz VOUT=5V, 70 60 50 40 30 20 10 10 9 8 7 6 5 4 3 2 1 0 VAGC (V) −20 2.0 fIN=1000kHz, VIN=74dBµ, MOD=30% fm=1kHz, Ta=25˚C TUNED ON N D+N (80%) D+N (30%) LED ON 1.0 D+N (80%) −70 −20 0 50 100 0 120 0 INPUT VOLTAGE : VIN (dBµ) POWER SUPPLY VOLTAGE : VCC (V) Fig.7 AM input / output characteristics Fig.8 AM characteristics vs. power suppy voltage !External dimensions (Units : mm) AM DETECTOR OUTPUT VOLTAGE : VO (dBm) TOTAL HARMONIC DISTORTION : THD (%) 10 0 −10 −20 −30 −40 −50 −60 −70 50 100 200 500 1k VCC=5V fIN=1000MHz VIN=74dBµ MOD=30% Ta=25˚C VO 15.0 ± 0.2 24 13 10 D+N (80%) 7.8 ± 0.3 5.4 ± 0.2 1.8 ± 0.1 5 1 12 0.11 1.27 0.4 ± 0.1 0.3Min. 0.15 D+N (30%) 2k 5k 10k 20k 0 FREQUENCY : fm (Hz) Fig.9 AM detector output and THD vs. frequency SOP24 0.15 ± 0.1