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參數(shù)資料
| 型號(hào)： | TDA7427A |
| 廠商： | 意法半導(dǎo)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(jī)頻率合成器和中頻計(jì)數(shù)器 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 160K |
| 代理商： | TDA7427A |
DIVIDERFROM VCO FREQUENCY TO
REFERENCE FREQUENCY
This divider provides a low frequency f
SYN
which
phase is compared with the reference frequency
f
REF
. It is controlled by the registers PC0 to PC4
and PC5to PC15
OPERATING MODES
Four operating modes are available fo PLL; they
are user programmable with the Mode PM regis-
ters (seetable below).
PM0
0
1
0
1
PM1
0
0
1
1
Operating Mode
Standby
AM (swallow)
AM (direct)
FM
- Standby mode:
in this mode all device func-
tions are stopped. This allows low current
consumption without loss of information in all
registers. The pin LP-OUT is forced to 0V,
and all data registers are set to EFH. The os-
cillator keeps running.
- FM and AM (SW)Swallow Mode (SW):
in this mode the FM or AM signal is applied to
a 32/33 prescaler, which is controlled by a 5
bit divider ’A’.The 5 bit register (PC0 to PC4)
controls this divider. In parallel the output of
the prescaler is connected to a 11 bit divider
’B’. (PC5 to PC15).
f
OSC
= (R+1)
f
REF
Dividing range calculation:
f
VCO
= [ 33
A + (B + 1 - A)
32 ]
f
REF
f
VCO
= (32
B + A + 32)
f
REF
Important:forcorrectoperationA
≤
32,B
≥
A,with
AandB variablevaluesofthedividers).
- AM direct mode:
the AM signal is applied di-
rectly to the 16 bit static divider ’C’. (PC0 to
PC15)
f
OSC
= (R + 1)
f
REF
Dividing range:
f
VCO
= (C +1)
f
REF
THREESTATE PHASECOMPARATOR
The phase comparator generates a phase error
signal according to phase difference between
f
SYN
and f
REF
. This phase error signal drives the
chargepump current generator(fig. 3)
CHARGE PUMP CURRENT GENERATOR
This stage generates signed pulses of current.
The phase error signal decides the duration and
polarityof thosepulses.
The current absolutevalues are programmable by
A0, A1, A2 registers for high current and B0, B1,
registersfor low current.
LOWNOISE 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 cooperationwith external
componentscan providean active filter.
OSC IN
REGISTER
RC0 ... RC15
PREDIVIDER
: R
PHASE
DETECTOR
AM IN
FM IN
REGISTER
PC0 ... PC15
PRESCALER
: C
fref
fsyn
D95AU376A
TO
CHARGE
PUMP
Figure 2. AM direct mode operation for SW, MW andLW
TDA7427A
8/21
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| TDA7427AAD | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER |
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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(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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