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)諧的汽車收音機(jī)及音響應(yīng)用
文件頁(yè)數(shù)： 18/38頁(yè)
文件大?。?/td> 337K
代理商： TDA7421N
TDA7421N
18/38
3.2.4 INLOCK DETECTOR
The charge pump is switched in low current mode as the truth table and the related figure shows.
The charge pump is forced in low current mode when a phase difference of 10-40 usec is reached.
A phase difference larger than the programmed values will switch the charge pump immediately in the high cur-
rent mode.
Few programmable delays are available for inlock detection.
4.0 IF COUNTER SYSTEM FOR AM/FM
The IF counter mode is controlled by IFCM register:
A 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 frequency. In FM mode a 6.25 KHz, in AM mode a 1KHz signal is generated.
This counter is followed by an asynchronous divider to generate several sampling times.
ADDRESS ORGANIZATION
(PLL and IF Counter)
CURRHIGH
LOCKENA
LOCK (by inlock detector)
Charge PumpCurrent
0
X
X
low current
1
1
1
low current
1
1
0
High current
1
0
1
High current
1
0
0
High current
IFCM1
IFCM0
FUNCTION
0
0
NOT USED
0
1
FM MODE
1
0
AM MODE
1
1
NOT USED
MSB
LSB
FUNCTION
SUBAD
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PLL CHARGE PUMP
00H
LPIN1/2
CURRH
B1
B0
A3
A2
A1
A0
LL COUNTER
01H
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
PLL COUNTER
02H
PC15
PC14
PC13
PC12
PC11
PC10
PC9
PC8
LL REF COUNTER
03H
RC7
RC6
RC5
RC4
RC3
RC2
RC1
RC0
LL REF COUNTER
04H
RC15
RC14
RC13
RC12
RC11
RC10
RC9
RC8
LL LOCK DETECT
05H
LDENA
-
D3
D2
D1
D0
PM1
PM0
FC REF COUNTER
06H
IRC7
IRC6
IRC5
IRC4
IRC3
IRC2
IRC1
IRC0
FC REF COUNTER
07H
IFCM1
IFCM0
IRC13
IRC12
IRC11
IRC10
IRC9
IRC8
FC CONTROL
08H
IFENA
-
-
-
-
EW2
EW1
EW0
C CONTROL
09H
IFS2
IFS1
IFS0
CF4
CF3
CF2
CF1
CF0
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:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AAD 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
TDA7427AAD1 制造商:STMICROELECTRONICS 制造商全稱: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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