TDA7421 STMicroelectronics, TDA7421 Datasheet

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... ADJUSTABLE AUDIO MUTE FULLY PROGRAMMABLE BY I ADVANCED BICMOS TECHNOLOGY GENERAL DESCRIPTION The TDA7421 is a high performance tuner circuit that integrates AM/FM sections, IF counter and PLL synthesizer on a single chip. Use of BICMOS technology allows the implemen- tation of tuning functions with a minimum of exter- nal components ...

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... TDA7421 BLOCK DIAGRAM IN+ LIM IN- LIM OUT AMP2 IF FM IN+ AMP2 IF FM IN- AMP2 IF FM OUT AMP1 IF FM IN+ AMP1 IF FM IN- AMP1 AGC IF FM OUT+ MIX OUT- MIX 2/38 VCO BPF AM IFREF AM IN IF2 AM OUT+ MIX2 AM OUT- MIX2 AM IN- MIX2 AM IN+ MIX2 AM TC AGCI AM ...

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... PLL "N. 3" loop filter connection to Op Amp inverting input 21 PLL VREF Voltage reference to Op Amp noninverting input 22 PLL GND PLL ground 2 23 SLEEP SDA SCL I Parameter Parameter C bus disconnect signal C bus data C bus clock Value - -55 to 150 10.2 5.5 Value typ. 68 Function TDA7421 Unit °C ° Unit °C/W 3/38 ...

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... TDA7421 PIN DESCRIPTION (continued) N. Name 27 DIG GND Digital circuits ground 28(*) IFC SSTOP Search stop signal or AM STEREO OUT Output (single ended amplifier 29 CLN GND "Clean" ground 30 IF2 GND IF 2nd ground 31 AM AGC2 TC AM 2nd AGC time constant 32 AM DET Connection to the capacitor of the AM diode-capacitor detector ...

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... FET probe osc Test Condition Europe/USA turn Japan Europe/USA turn CC Japan fosc = 108.8MHz, Europe/USA f = 72.3MHz, Japan OSC with high impedance FET probe XTAL Test Condition TDA7421 Min. Typ. Max. Unit 4.75 5.25 V 4.0 4.6 5.2 mA 3.5 4.0 4 1.2 1 ...

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... TDA7421 ELECTRICAL CHARACTERISTICS (continued) FM Section Global Performances Refer to Evaluation Circuit and enclosed curves (S+N/N, THD Input 98.1MHz, 75KHz dev., 1KHz mod.,60dBu c - Audio Output: BPF 20Hz - 20KHz Symbol Parameter S+N/N Signal to Noise Ratio THD Total Harmonic Distortion V Audio Output Level O AF ...

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... FMLIMIN V = 102dBu FMLIMIN V = 70dBu, FSL4-0 set to FMLIMIN 00000 SM,FILT V = 70dBu, FSL4-0 set to FMLIMIN 11111 SM,FILT V > LS FMLIMIN V > LS, measured at FMLIMIN V , FMADJ set to 1 SMSHIFT TDA7421 Min. Typ. Max. Unit 330 330 16.5 17.5 18.5 dB 14.5 15.5 16.5 dB 18.5 19.5 20 109 dBu u2 ...

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... TDA7421 ELECTRICAL CHARACTERISTICS (continued) FM Audio Amplifier Ref: FM Test circuit, measure: - Input 95dBu, f FMLIMIN IN - audio output BPF 20Hz to 20KHz AUDIO - muting voltage at V MUTE, DRIVE Symbol Parameter V Mute Voltage MUTE V Play Voltage PLAY G Audio Amplifier Gain in Play AMP,PLAY Conditions G Audio Amplifier Highest Gain in ...

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... Test Condition V level at which FMLIMIN V = 2.5, FSM4-0 set to 00000 FMSD V level at which FMLIMIN V = 2.5, FSM4-0 set to 11111 FMSD Test Condition frequency shift from 10.7MHz at which V = 2.5V FMSD TDA7421 Min. Typ. Max. Unit 23 KHz 22.5 30 37.5 KHz 7.5 10 12.5 KHz 34/6 s/s Min. ...

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... TDA7421 ELECTRICAL CHARACTERISTICS (continued) Adjacent Channel Station Detector Ref: FM Test Circuit, measure: - Input desired 10.7MHz, 95dBu CW; undesired 10.8MHz CW FMLIMIN - output at V FMSD - FMRECSEEK set to 1 Symbol Parameter ACSD Adjacent Channel Detector MAX Maximum Sensitivity Threshold ACD Adjacent Channel Detector MIN Minimum Sensitivity Threshold ...

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... MIX2OUT Min. Typ. 5 19.6 122 90.7 61.2 40 MIX2AMIN is AGC - MIXCP 24 is MIX2OUT TDA7421 Max. Unit dBu dBu dBu dBu dBu dBu K mA Max. Unit K dB dBu dBu dBu dBu dB 11/38 ...

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... TDA7421 ELECTRICAL CHARACTERISTICS (continued) AM IF2 Amplifier Ref: AM Test Circuit, measure input 450KHz. IN Symbol Parameter R Input Resistance IN,IF2AMP G Maximum Gain IF2AMP AGC Central Point of AGC2 Intevention AMPCP on IF2 Amp AGC AGC2 Starting Point on IF2 Amp AMPSP AGC AGC2 Range on IF2 Amp AMPR ...

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... IF2 ceramic filter Test Condition V = GND Tristate 1) out Tristate IN DD out I = -0.2mA 8. 0.2mA 8.5V CC OUT V = 8.5V; PLL Vout = 0 Test Condition TDA7421 Min. Typ. Max. Unit - 0 Min. Typ. Max Unit 100 500 KHz 300 ns 4 ...

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... TDA7421 AM TEST CIRCUIT 1 V MIX1AMIN 2 15pF 11 1M VXTAL 12 15pF FM TEST CIRCUIT V Tun T1 1:3.5 V MiXFMIN V Tun 5K V1 22pF 15pF L2 1.8K 68pF V FMRFAGCIN 10nF V FMAGCOUT 10nF 14/38 V MiXOUT 330 MiX2AMIN AGC W & N AGC2 AMSD AMSMETER V MIXOUT 330 V T2 FMIFAGCIN V CC 10nF 10nF 10nF ...

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... IF COUNTER SYSTEM FOR AM/FM The IF counter mode is controlled by IFCM register: IFCM1 sample timer to generate the gate signal for the main counter is built with a 14 bit programmable counter to have the possibility to use any fre- TDA7421 connects REF LOCK Charge LOCKENA (by inlock Pump detector) Current ...

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... TDA7421 ADDRESS ORGANIZATION (PLL and IF Counter) FUNCTION SUBAD PLL CHARGE PUMP 00H PLL COUNTER 01H PLL COUNTER 02H PLL REF 03H COUNTER PLL REF 04H COUNTER PLL LOCK 05H DETECT IFC REF COUNTER 06H IFC REF COUNTER 07H IFC CONTROL 08H ...

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... I C BUS INTERFACE General Description The TDA7421 supports the I protocol defines the devices sending data into the bus as transmitter and the receiving device as the receiver. The device that controls the transfer is a master and the device being controlled is the slave. The master will always initiates data transfer and pro- vide the clock to transmit or receive operations ...

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... A STOP condition is defined by a LOW to HIGH transition of the SDA while the SCL line stable HIGH level. This condition terminate the communication between the devices and force’s the bus interface of the TDA7421 into the initial condition. Acknowledge Indicates a successful data transfer. The trans- mitter will release the bus after sending 8 bit of data ...

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... IF Counter Block Diagram IFENA IF-AM IF-FM OSC Bus Timing Diagram SCL t SU-STA SDA IN SDA OUT 11-21 BIT COUNTER CF-REGISTER 14 BIT COUNTER 3 BIT COUNTER IFC-REGISTER IFS-REGISTER t HIGH LOW t HD-DAT t SD-DAT t HD-STA EW-REGISTER ZD UP/DOWN COUNTER D97AU809 SUBTOP t txt D95AU378 TDA7421 19/38 ...

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... TDA7421 Frame Example For addressing the PLL part: CHIP ADDRESS MSB D96AU549 for the TUNER part: CHIP ADDRESS MSB D96AU550 ACK = Acknowledge S = Start P = Stop TUNER SUBADDRESS MSB PLL SUBADDRESS MSB T1, T2, T3 are used for testing the PLL, in application mode they have to be "0". ...

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... PC3 PC2 PC1 PC0 Bit name TDA7421 FUNCTION High current = 0mA High current = 0.5mA High current = 1.0mA High current = 1.5mA High current = 2.0mA High current = 2.5mA High current = 3.0mA High current = 3.5mA High current = 4.0mA High current = 4.5mA High current = 5.0mA High current = 5 ...

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... TDA7421 PLL COUNTER 2 (MSB) MSB all combinations allowed PC15 PC14 PC13 PC12 Swallow mode LSB + MSB + 32 vco syn PLL REFERENCE COUNTER 1 (LSB) MSB all combinations allowed RC7 RC6 RC5 RC4 PLL REFERENCE COUNTER 2 (MSB) MSB all combinations allowed RC15 RC14 RC13 ...

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... IRC3 IRC2 IRC1 IRC0 TDA7421 FUNCTION PLL standby mode PLL AM not used PLL FM mode PD phase difference threshold 10ns PD phase difference threshold 20ns PD phase difference threshold 30ns PD phase difference threshold 40ns Not used in application mode Activation delay = 4 f ref Activation delay = 6 f ref ...

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... TDA7421 IF COUNTER REFERENCE CONTROL 2 (MSB) AND IF COUNTER MODE SELECT MSB all combinations allowed IFCM1 IFCM0 IRC13 IRC12 IRC11 IRC10 LSB + MSB + 1 osc tim IF COUNTER CONTROL 1 MSB IFENA 24/38 LSB MSB = MSB = 256 MSB = 512 MSB = 15616 MSB = 15872 MSB = 16128 NOT USED IN APPLICATION MODE ...

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... MODE) tsample = 5.12ms (FM mode); 32ms (AM; MODE) tsample = 2.56ms (FM mode); 16ms (AM; MODE) tsample = 1.28ms (FM mode); 8ms (AM;MODE) tsample = 640 s (FM mode); 4ms (AM;MODE) tsample = 320 s (FM mode); 2ms (AM; MODE) tsample = 160 s (FM mode); 1ms (AM; MODE) TDA7421 FUNCTION Subaddress = 09H 25/38 ...

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... TDA7421 TUNER DATA BYTE SPECIFICATION ADDRESS ORGANIZATION (Tuner AM/FM) FUNCTION SUBAD STATUS 00H FM STOP STATION/ 01H FM IF AGC FM SMETER SLIDER 02H AM AGC1/AM STOP 03H STATION IFT1/IFT2 04H FRONT END 05H ADJUSTMENT FM DEMODULATOR 06H ADJUSTMENT FM IF BUFFERS 07H FM SOFT MUTE/ 08H FM AUDIO MUTE GAIN ...

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... TDA7421 LSB FUNCTION S0 AM/FM/ STBY 0 STAND- ON, RECEPTION, DEEP MUTE 1 FM ON, SEEK, DEEP MUTE 1 FM ON, RECEPTION, SHALLOW MUTE 1 FM ON,SEEK SHALLOW MUTE FOR DEMOD ADJUSTM, DEMOD FOR DEMOD ADJUSTMENT DEMOD MUTED (Japan), RECEPTION, IFC OUT SELECTED (Japan), SEEK, IFC OUT SELECTED (Japan), ...

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... TDA7421 FM STOP STATION / FM IF AGC (subaddress 01H) MSB FAG2 FAG1 FAG0 fmifagc fmifagc fmifagc MSB LSB all combinations allowed FM SMETER SLIDER (subaddress 02H) MSB FSL4 FSL3 FSL2 fmsmeters fmsmeterslider lider MSB all combinations allowed 28/38 FAG4 FSS3 FSS2 fmstop fmstop fmstop ...

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... Maximum sensitivity Minimum sensitivity AM STOP STATION THRESHOLD Maximum sensitivity Minimum sensitivity LSB FUNCTION T1A1 T1A0 ADJUSTMENT IFT1 IFT1 CAPACITOR adjust adjust LSB ift1 ift1 ift1 ift1 1 1 15C ift1 0 Ci ft2 2Ci ft2 4Ci ft2 8Ci ft2 15Ci ft2 TDA7421 29/38 ...

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... TDA7421 FRONT END ADJUSTMENT (subaddress 05H) MSB ANA3 ANA2 ANA1 ant ant ant adjustm adjustm adjustm MSB all combinations allowed 30/38 ANA0 RFA3 RFA2 ant RF RF adjustm adjustm adjustm adjustm LSB MSB all combinations allowed LSB FUNCTION RFA1 RFA0 Voffset RF varicap / ...

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... CAPACITOR LSB demod demod demod demod 0 0 16C demod 0 0 32C demod 0 0 64C demod 1 1 127C demod SD DISABLE SD ENABLED SD DISABLED (High impedance output) LSB FUNCTION FBH1 FBH0 BUFFER 1 GAIN (dB) buff1 gain LSB 18.5 BUFFER 2 GAIN (dB TDA7421 31/38 ...

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... TDA7421 FM SOFT MUTE / FM AUDIO MUTE GAIN (subaddress 08H) MSB FSM3 FSM2 FSM1 fmsoftmute fmsoftmute fmsoftmute fmsoftmute MSB all combinations allowed FM HOLE DETECTOR / FM DETUNING DETECTOR (subaddress 09H) MSB BWM2 BWM1 BWM0 BW MSB BW BW LSB RECEPTION all else not allowed SEEK all combinations allowed ...

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... RF GND 22p 8 VCO B 15p 9 VCO E 68p 10 OSC GND 11 L2 XTAL D 15p 12 XTAL 1M 10.25MHz 13 OSC VCC 14 FM ANT ADJ 15p ADJ 16 PLL VCC OSCVcc 10n 10n + 10u From LPOUT - pin 17 + 3.3n + 2.2u 22n 10u TDA7421 TP18 TP22 TP19 AM ST 33/38 ...

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... TDA7421 Evaluation Board Schematic Circuit (part C) 48 FMIF AMP2OUT 47 IF1 VCC 46 FM LIM IN LIM IN- IF1 GND MUTE DRIVE 41 FM/AM S-METER 40 FM SD/AM SD AUDIO OUT QUAD+ FM QUAD IF2 VCC 35 AM IF2 IN AM REF BPF Evaluation Board Schematic Circuit (part D) RFVcc 100n 1mH ...

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... C (4-6)= 47pF; C INT Supply Voltage (12V) MR1 220n + 100u F.C. N.C. OUT 8.5V 4 100n + 220n 47u +5V (2-3) = 82pF; C (1-3) = 10pF INT EXT (1-3) = 20pF EXT (4-6) = 13.5pF EXT TDA7421 10 RFVcc 10 PLLVcc 10 OSCVcc 10 IF1Vcc & IF2 Vcc L78L05A 220n 35/38 ...

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... TDA7421 FM THD Vs= 8V fin= 98.1MHz +/-75KHz fm= 1KHz 20Hz - 20KHz filter FIELD STRENGTH (dBu) AM THD Vs= 8V fin= 1MHz m= 30% fm= 1KHz 20Hz - 20KHz filter FIELD STRENGTH (dBu) 36/38 FM S+N/N FIELD STRENGTH (dBu) AM S+N/N FIELD STRENGTH (dBu) Vs= 8V fin= 98.1MHz +/- 75KHz fm= 1KHz 20Hz - 20KHz filter ...

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... TQFP64 TDA7421 inch MIN. TYP. 0.002 0.053 0.055 0.007 0.009 0.0047 0.0063 0.0079 0.472 0.394 0.295 0.0197 0.472 0.394 0.295 0.0157 0.0236 0.0295 0.0393 A ...

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... TDA7421 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice ...