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參數(shù)資料
| 型號(hào)： | TDA5251F1 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK 315MHz Wireless Transceiver |
| 中文描述： | 詢價(jià)/ FSK信號(hào)315MHz的無線收發(fā)器 |
| 文件頁數(shù)： | 19/88頁 |
| 文件大小： | 2086K |
| 代理商： | TDA5251F1 |
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TDA5251 F1
Version 1.0
Functional Description
Preliminary Specification
19
2003-02-18
Confidential
2.4.5
PLL Synthesizer
The Phase Locked Loop synthesizer consists of two VCOs (i.e. transmit and receive VCO), a
divider by 4, an asynchronous divider chain with selectable overall division ratio, a phase detector
with charge pump and a loop filter and is fully implemented on-chip. The VCOs are including spiral
inductors and varactor diodes. The center frequency of the transmit VCO is 630MHz, the center
frequency of the receive VCO is 840MHz.
Generally in receive mode the relationship between local oscillator frequency fosc, the receive RF
frequency fRF and the IF frequency fIF and thus the frequency that is applied to the I/Q Mixers is
given in the following formula:
The VCO signal is applied to a divider by 2 and afterwards by 4 which is producing approximately
105MHz signals in quadrature. The overall division ratio of the divider chain following the divider by
2 and 4 is 6 in transmit mode and 8 in receive mode as the nominal crystal oscillator frequency is
13.125MHz. The division ratio is controlled by the
RxTx
pin (pin 5) and the
D10
bit in the
CONFIG
register.
2.4.6
The I/Q IF to zero-IF mixers are followed by baseband 6
th
order low pass filters that are used for
RF-channel filtering.
I/Q Filters
iq_filter.wmf
Figure 2-3
One I/Q Filter stage
The bandwidth of the filters is controlled by the values set in the filter-register. It can be adjusted
between 50 and 350kHz in 50kHz steps via the bits D1 to D3 of the
LPF
register (subaddress 03H).
IF
RF
osc
2
f
f
4/3
f
[2 – 1]
INTERNAL BUS
OP
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| TDA5251F1_07 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 315MHz Wireless Transceiver |
| TDA5251XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
| TDA5252 | 功能描述:射頻接收器 ASK/FSK WIRELESS TRANSCEIVER RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| TDA5252G2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 915MHz Wireless Transceiver |
| TDA5252XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V 38-Pin TSSOP T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
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