Document
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TDA7427A
AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
ON-CHIP REFERENCE OSCILLATOR AND PROGRAMMABLE IF COUNTER VHF INPUT AND PRECOUNTER FOR FREQUENCIES UP TO 290MHz (SUITABLE FOR DAB APPLICATION) HF INPUT FOR FREQUENCIES UP TO 64MHz (SHORT WAVE BAND) IN-LOCK DETECTOR FOR SEARCH/STOP STATION FUNCTION STAND-BY MODE FOR LOW POWER CONSUMPTION HIGH CURRENT SOURCE FOR 0.5ms LOCK-IN TIME DIGITAL PORT EXTENSION WITH SIX OUTPUTS FOR FLEXIBILITY IN APPLICATION FULLY PROGRAMMABLE BY I2C BUS DESCRIPTION The TDA7427A is a PLL frequency synthesizer BLOCK DIAGRAM
TSSOP28
SO28
ORDERING NUMBERS: TDA7427AAD (TSSOP28) TDA7427AAD1 (SO28)
with an additional IF counting system that performs all the functions needed in a complete PLL radio tuning system for conventional and high speed RDS tuners. The device has dedicated outputs for IN-LOCK detection and Search/Stop station.
SWITCH OUT FM_IN 24 PRECOUNTER :32/33 HFREF 19 SWITCH AM/FM SWITCH SWM/DIR SWITCH SWM/DIR PHASE COMP CHARGE PUMP + VDD1 5 BIT PROG. COUNTER INLOCK DETECTOR
17
DOUT1/INLOCK
2 3 SWITCH LP1/LP2 1
LP_HC LP_AM LP_FM
AM_IN
25
28
LP_OUT
11 BIT PROG COUNTER OSCIN OSCOUT 9 10 REF OSCILLATOR 16 BIT PROG COUNTER
4
VREF
ADDR SCL SDA
20 12 13 I2C BUS INTERFACE 26 GNDAN
VDD2 VDD1 GNDDIG IF_AM
27 21 22 14 SWITCH AM/FM 11-21 BIT PROG COUNTER PORT EXTENSION SUPPLY & POWER-ON RESET 14 BIT PROG COUNTER TIMER CONTROL TEST LOGIC
IF_FM
15
16
D95AU372D
18 DOUT2
5 DOUT3
6 DOUT4
7 DOUT5
8 DOUT6
SSTOP
July 1998
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TDA7427A
ABSOLUTE MAXIMUM RATINGS
Symbol VDD1 VDD2 Ptot Tstg Tamb Supply Voltage Supply Voltage Total Power Dissipation Storage Temperature Ambient Temperature Parameter Value - 0.3 to + 7 - 0.3 to + 11 300 - 55 to + 150 -40 to + 85 Unit V V mW
o o
C C
PIN CONNECTION
LP_FM LP_HC LP_AM VREF DOUT3 DOUT4 DOUT5 DOUT6 OSCIN OSCOUT N.C. SCL SDA IF_AM
1 2 3 4 5 6 7 8 9 10 11 12 13 14
D95AU374C
28 27 26 25 24 23 22 21 20 19 18 17 16 15
LPOUT VDD2 GND-AN AM_IN FM_IN N.C. GND-DIG VDD1 ADDR HFREF DOUT2 DOUT1/INLOCK SSTOP IF_FM
THERMAL DATA
Symbol Rth j-amb Parameter Thermal Resistance Junction-Ambient TSSOP28 160 SO 28 65 Unit
o
C/W
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TDA7427A
PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17* 17* 18 19 20 21 22 23 24 25 26 27 28 SYMBOL DESCRIPTION
LP_FM LP_HC LP_AM VREF DOUT3 DOUT4 DOUT5 DOUT6 OSCIN OSCOUT N.C. SCL SDA IF_AM IF_FM SSTOP DOUT1 INLOCK DOUT2 HF-REF ADDR VDD1 GND-DIG N.C. FM_IN AM_IN GND-AN VDD2 LP_OUT
Filter OPAMP input, charge pump output (FM mode) Filter OPAMP input, charge pump output (high current mode) Filter OPAMP input, charge pump output (AM mode) OPAMP reference voltage Digital Output 3 (open collector) Digital Output 4 (open collector) Digital Output 5 (open collector) Digital Output 6 (open collector) Reference Oscillator Input Reference Oscillator Output Not connected I 2C bus clock input I 2C bus data I/O IF counter HF input IF counter VHF input IF counter result output Digital output 1 (push-pull) Inlock detector output Digital Output 2 (open collector) HF reference pin I 2C bus address pin Supply Voltage Digital ground Not connected High frequency input FM High frequency input AM Analog ground Supply Voltage Filter OPAMP output
* Pin function is selectable by software (see software specification)
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TDA7427A
ELECTRICAL CHARACTERISTICS (Tamb = 25°C; VDD1 = 5V; VDD2 = 10V; fOSC = 4MHz; unless otherwise specified).
Symbol VDD1 VDD2 IDD1 IDD2 IDD1 STB Parameter Supply Voltage Supply Voltage Supply Current Supply Current Supply Current no output load PLL locked Standby mode 2 1 Test Condition Min. 4.5 Typ. 5.0 9.0 4 2 Max. 5.5 11.0 6 3 1 Unit V V mA mA µA MHz MHz mVrms mVrms 30 600 3 3 4 4 5 5 mVrms mVrms KΩ KΩ MHz MHz mVrms mVrms mVrms mVrms 4 4 5 5 KΩ KΩ ns 400 300 4.7 4.0 4.7 4.0 4.7 1 250 1 0.3 4.7 300 kHz ns µs µs µs µs µs µs ns µs µs µs ns
RF INPUT (AM_IN, FM_IN) fiAM fiFM ViMIN ViMAX ViMIN ViMAX Zin Zin Input Frequency AM Input Frequency FM Min Input Voltage AM Max Input Voltage AM Min Input Voltage FM Max Input Voltage FM Input Impedance FM input Input Impedance AM input Vi = 100mVrms sinusoidal Vi = 100mVrms sinusoidal 0.5 to 16MHz range sinusoidal 0.6 to 16MHz range sinusoidal 70 to 120MHz range sinusoidal 70 to 120MHz range sinusoidal 600 0.5 30 64 200 30
IF COUNTER (IF_AM, IF_FM) fiAM fiAM ViMIN ViMIN ViMAX ViMAX Zin Zin Input Frequency range AM Input Frequency range FM Min Input Voltage AM IF pin Min Input Voltage FM IF pin Max Input Voltage AM IF pin Max Input Voltage FM IF pin Input Inpedance FM IF pin Input Inpedance AM IF pin Vi = 100mVrms Vi = 100mVrms fin = 455kHz fin = 10.7MHz fin = 455kHz fin = 10.7MHz 600 600 3 3 0.400 10 11 11 30 30
BUS INTERFACE Tj fSCL tAA tbuf tHD-START tLOW tHIGH tSU-SDA tHD-DATA tSU-DATA tR tF tSU-STOP tDH Noise Suppression Time Constant on SCL, SDA Input SCL Clock Frequency SCL Low to SDA Data Valid Time the bus must be free for the new transmission START Condition hold time Clock Low Period Clock High Period Start Condition Setup Time Data.