參數(shù)資料
型號(hào)： TDA5211
廠商： INFINEON TECHNOLOGIES AG
英文描述： ZENER,SML4744,15V,5%,1W
中文描述： 詢價(jià)/ FSK信號(hào)單一轉(zhuǎn)換接收器
文件頁(yè)數(shù)： 19/52頁(yè)
文件大小： 1469K
代理商： TDA5211
Functional Description
3 - 11
TDA 5211
Wireless Components
Specification, May 2001
The calculation of the value of the necessary quartz load capacitance is shown
in Section 4.3, the quartz frequency calculation is explained in Section 4.4.
3.4.5
Limiter
The Limiter is an AC coupled multistage amplifier with a cumulative gain of
approximately 80 dB that has a bandpass-characteristic centred around
10.7 MHz. It has a typical input impedance of 330
to allow for easy interfacing
to a 10.7 MHz ceramic IF filter. The limiter circuit also acts as a Receive Signal
Strength Indicator (RSSI) generator which produces a DC voltage that is
directly proportional to the input signal level as can be seen in Figure 4-2. This
signal is used to demodulate ASK-modulated receive signals in the subsequent
baseband circuitry. The RSSI output is applied to the modulation format switch,
to the Peak Detector input and to the AGC circuitry.
In order to demodulate ASK signals the MSEL pin has to be left open as
described in the next chapter.
3.4.6
FSK Demodulator
To demodulate frequency shift keyed (FSK) signals a PLL circuit is used that is
contained fully on chip. The Limiter output differential signal is fed to the linear
phase detector as is the output of the 10.7 MHz center frequency VCO. The
demodulator gain is typically 140μV/kHz. The passive loop filter output that is
comprised fully on chip is fed to both the VCO and the modulation format switch
described in more detail below. This signal is representing the demodulated sig-
nal with low frequencies applied to the demodulator demodulated to logic ones
and high frequencies demodulated to logic zeroes. However this is only valid in
case the local oscillator is low-side injected to the mixer which is applicable to
receive frequencies above 330MHz (e.g. 345MHz). In case of receive frequen-
cies below 330MHz (e.g.315MHz) high frequencies are demodulated as logical
ones due to a sign inversion in the downconversion mixing process. See also
Section 4.4.
The modulation format switch is actually a switchable amplifier with an AC gain
of 11 that is controlled by the
MSEL
pin (Pin 15) as shown in the following table.
This gain was chosen to facilitate detection in the subsequent circuits. The DC
gain is 1 in order not to saturate the subsequent Data Filter wih the DC offset
produced by the demodulator in case of large frequency offsets of the IF signal.
The resulting frequency characteristic and details on the principle of operation
of the switch are described in Section 4.6.
Table 3-3 MSEL Pin Operating States
MSEL
Modulation Format
Open
ASK
Shorted to ground
FSK
相關(guān)PDF資料
PDF描述
TDA5212 ASK/FSK 915MHz Single Conversion Receiver
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TDA5250 ASK/FSK 868MHz Wireless Transceiver
TDA5250D2 ASK/FSK 868MHz Wireless Transceiver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA5211T 制造商:Infineon Technologies AG 功能描述:315MHZ ASK/FSK SUPHET RCVR TSS
TDA5211XT 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK/FSK 5V 28-Pin TSSOP T/R
TDA5211XUMA1 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK/FSK 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:IC FSK/ASK RECEIVER P-TSSOP-28 制造商:Infineon Technologies AG 功能描述:IC LP FSK/ASK SHR P-TSSOP-28
TDA5212 功能描述:射頻接收器 CNTRL RF RECEIVER 928MHZ 5V 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
TDA5212_06 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 915MHz Single Conversion Receiver
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