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參數(shù)資料
| 型號： | TDA7427AAD1 |
| 廠商： | 意法半導體 |
| 元件分類： | 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收音機頻率合成器和中頻計數(shù)器 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 160K |
| 代理商： | TDA7427AAD1 |
The negative input is switchable to three input
pins ( LPIN 1, LPIN 2 and LPIN 3) to increasethe
flexibility in application. This feature allows two
separate active filters for differentapplications
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.
INLOCK DETECTOR
The charge pump can be switched in low current
mode either via software or automatically by the
inlock detectorby setting bit LDENAto ”1”.
The charge pump is forced in low current mode
when a phase difference of 10-40
μ
sec is
reached.
A phase difference larger then the programmed
values will switch the chargepump immediately in
the high currentmode.
Programmable delays are available for inlock de-
tection.
IFCOUNTERSYSTEM(AM/FM/AM -UPCMODES)
The if counterworks in modes controlled by IFCM
register(see table):
IFCM1
0
IFCM0
0
FUNCTION
NOT USED
0
1
FM MODE
1
0
AM MODE
1
1
10.7MHz AM UP
CONVERSION MODE
Typical input impedancefor IF inputs is 4K
.
A sampletimer to generatethe gate signal for the
main counter is build with a 14-bit programmable
counter to have the possibility to use any crystal
oscillator frequency. In FM mode 6.25KHz in AM
mode a 1KHz signal is generated.This is followed
by an asynchronous divider to generate different
sampling times (seefig. 4).
IntermediateFrequency Main Counter
This counter is a 11/21 bits synchronous autore-
load down-counter. Four bits are programmable
to have the possibility for an adjust to the fre-
quency of the CF filter. The counter length is
automatically adjusted to the chosen sampling
time and the countermode (AM, FM, AM-UPC).
At the start the counter will be loaded with a de-
fined value which is an equivalent to the divider
value (t
sample
f
IF
).
If a correct frequency is applied to the IF counter
frequency inputs IF-AM IF-FM, at the end of the
sampling time the main counter is changing its
state from 0 H to 1FFFFFH.
This is detected by a control logic. The frequency
range inside which a successful count results is
detectedis adjustableby bitsEW 0,1,2.
Adjustment of the Measurement Sequence
Time
The precision of the measurements is adjustable
by controllingthe discrimination window .
This is adjustable by programming the control
registersEW0...EW2.
The measurement time per cycle is adjustable by
setting the RegisterIFS0 - IFS2.
Adjust of the Frequency Value
The center frequency of the discrimination win-
dow is adjustable by the control register ”CF0” to
”CF4”.(see data byte specification).
PortExtension and additional functions
Five digital open collector outputs and one digital
push-pull output are available in application
mode. This digital ports are controlled by the data
bits DOUT1-DOUT6.
D95AU378
tHIGH
tR
tLOW
tR
SCL
SDA IN
SDA OUT
tSU-STA
tHD-STA
tHD-DAT
tSD-DAT
tSUBTOP
ttxt
tAA
tDH
Figure 5. I
2
C Bus timing diagram
TDA7427A
10/21
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參數(shù)描述 |
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| 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: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TDA7429 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DIGITALLY CONTROLLED AUDIO PROCESSOR WITH SURROUND SOUND MATRIX |
| TDA7429L | 功能描述:音頻 DSP 3-Band Equalizer RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
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