參數(shù)資料
型號(hào)： TDA7427A
廠商： 意法半導(dǎo)體
元件分類(lèi)： 通用總線功能
英文描述： AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
中文描述： 上午- FM收音機(jī)頻率合成器和中頻計(jì)數(shù)器
文件頁(yè)數(shù)： 6/21頁(yè)
文件大?。?/td> 160K
代理商： TDA7427A
GENERAL DESCRIPTION
This circuit contains a frequency synthesiser and
a loop filter for use in FM/AM radio tuning sys-
tems. Only a VCO is required to build a complete
PLL system. For auto search/stop operation an IF
counter system is available.
For FM and SW AM application, the counter
works in a two-stageconfiguration. The first stage
is a swallow counter with a two modulus (:32/33)
precounter. The second stage is an 11-bit pro-
grammable counter.
For LW and MW application,a 16-bit programma-
ble counteris available.
The circuit receivesthe scaling factors for the pro-
grammable counters and the values of the refer-
ence frequenciesvia a I
2
C bus interface.
The reference frequencyis generatedby an inter-
nal XTAL oscillator followed by the reference di-
vider. The device can operate with XTAL oscilla-
tor between 4 and 13MHz either in master mode
and in slavemode.
The reference and step frequencies are free se-
lectable. (XTAL frequency divided by an integer
value). The outputs signals of the phase detector
are switching the programmable current sources.
The loop filter integrates their currents to a DC
voltage.
Values of the current sources are programmable
by 6 bitsalso received via the I
2
C bus.
To minimize the noise induced by the digital part
of the system, a separate power supply supplies
the internal loop filter amplifier. The loop gain can
be set for different conditions by setting the cur-
rent valuesof thecharge/pumpgenerator.
IF COUNTER SYSTEM
Two separate inputs are available for AM and FM
IF signals. The level of integration is adjustable
by six different measuringcycle times.
The tolerance of the accepted count value is ad-
justable, to reach an optimum compromise for
searchspeed and precisionof the evaluation.
For the FM range the center frequency of the
measured count value is adjustable in 32 steps,
to get the possibility of fitting the IF filter toler-
ance. In the AM range an IF frequency of 448 to
479KHz ( 10.684 to 10.715MHz for AM up-con-
version)with 1KHzsteps is available.
PLL FREQUENCY SYNTHESIZER
InputAmplifiers
The signals applied on AM and FM inputs are am-
plified to get a logic level in order to drive the fre-
quencydividers.
The typical input impedance for FM and AM in-
puts is 4k
.
MSB
LSB
BIT 0
A0
FUNCTION
SUBAD
00H
BIT 7
LPIN1/2
BIT 6
CURRH
BIT 5
B1
BIT 4
B0
BIT 3
A3
BIT 2
A2
BIT 1
A1
PLL CHARGE PUMP
PLL COUNTER
01H
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
PLL COUNTER
02H
PC15
PC14
PC13
PC12
PC11
PC10
PC9
PC8
PLL REF COUNTER
03H
RC7
RC6
RC5
RC4
RC3
RC2
RC1
RC0
PLL REF COUNTER
04H
RC15
RC14
RC13
RC12
RC11
RC10
RC9
RC8
PLL LOCK DETECT
05H
LDENA
INLOCK
D3
D2
D1
D0
PM1
PM0
IFC REF COUNTER
06H
IRC7
IRC6
IRC5
IRC4
IRC3
IRC2
IRC1
IRC0
IFC REF COUNTER
07H
IFCM1
IFCM0
IRC13
IRC12
IRC11
IRC10
IRC9
IRC8
IFC CONTROL
08H
IFENA
-
-
-
-
EW2
EW1
EW0
IFC CONTROL
09H
IFS2
IFS1
IFS0
CF4
CF3
CF2
CF1
CF0
OSC ADJUST
0AH
-
-
-
OSC4
OSC3
OSC2
OSC1
OSC0
PORT EXTENSION
0BH
-
-
DOUT3
DOUT4
DOUT5
DOUT6
DOUT2
DOUT1
Table 1. Address Organization
TDA7427A
6/21
相關(guān)PDF資料
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參數(shù)描述
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
TDA7427AD1TR 功能描述:鎖相環(huán) - PLL AM/FM Radio Freq Syn RoHS:否 制造商:Silicon Labs 類(lèi)型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
TDA7427D 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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