參數(shù)資料
型號(hào)： TDA7421N
廠商： 意法半導(dǎo)體
英文描述： AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS
中文描述： AM / FM調(diào)諧的汽車(chē)收音機(jī)及音響應(yīng)用
文件頁(yè)數(shù)： 17/38頁(yè)
文件大?。?/td> 337K
代理商： TDA7421N
17/38
TDA7421N
1.0 FM SECTION
Featuring a single conversion configuration, it comprises a multi-stage IF limiter whose gain is I
2
C controlled
and a quadrature demodulator with detuning and adjacent channel detectors. Signal meter and stop station
functions are also supported
2.0 AM SECTION
AM signal is converted by means of UP-DOWN configuration (IF1 = 10.7MHz, IF2 = 450KHz) and MW/LW
bands are covered.
3.0 PLL SECTION
Three operating modes are available:
They are user programmable with the mode PM registers.
3.1 Standby mode
It stops all functions. This allows low current consumption without loss of information in all registers. The pin LP-
OUT is forced to 0V in power on. All data registers are set to FE (11111110). The oscillator does not run in stand-
by mode.
3.2 FM and AM Operation
The FM or AM signal applies to a 32/33 prescaler, which is controlled by a 5 bit counter (A). The 5 bit register
(PC0 to PC4) controls this divider.
The output of the prescaler connects to a 11 bit divider (B). The 11 bit register (PC5 to PC15) controls the divider 'B'.
3.2.1 THREE STATE PHASE COMPARATOR
The phase comparator generates a phase error signal according to phase difference between fSYN and fREF.
This phase error signal drives the charge pump current generator.
3.2.2 CHARGE PUMP CURRENT GENERATOR
This stage generates signed pulses of current. The phase error signal decides the duration and polarity of those
pulses.The current absolute values are programmable by A0, A1, A2 registers for high current and B0, B1 reg-
isters for low current.
3.2.3 LOW NOISE CMOS OP-AMP
An internal voltage divider at pin VREF connects the positive input of the low noise Op-Amp.The charge pump
output connects the negative input. This internal amplifier in cooperation with external components can provide
an active filter. The negative input is switchable to three input pins (LPIN 1, LPIN 2 and LPIN 3), to increase the
flexibility in application.This feature allows two separate active filters for different applications.A logical "1" in the
LPIN 1/2 register activates pin LPIN 1, otherwise pin LPIN 2 is active. While the high current mode is activated
LPIN 3 is switched on.
PM0
PM1
Operating Mode
0
0
Standby
1
0
AM
0
1
not used
1
1
FM
相關(guān)PDF資料
PDF描述
TDA7421 AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS
TDA7427A AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AAD AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AAD1 AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427 AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7427 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427A 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AAD 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AAD1 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AD1 功能描述:音頻 DSP AM/FM Radio Freq Syn RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
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