參數(shù)資料
型號： TDA5221
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK Single Conversion Receiver
中文描述： 詢價/ FSK信號單一轉(zhuǎn)換接收器
文件頁數(shù)： 19/44頁
文件大?。?/td> 705K
代理商： TDA5221
Functional Description
3 - 11
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
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 in its
‘
High
‘
-state
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.
The demodulator circuit is switched off in case of reception of ASK signals.
3.4.7
Data Filter
The data filter comprises an OP-Amp with a bandwidth of 100kHz used as a
voltage follower and two 100k
=
on-chip resistors. Along with two external
capacitors a 2nd order Sallen-Key low pass filter is formed. The selection of the
capacitor values is described in Section 4.2.
Table 3-2 MSEL Pin Operating States
MSEL
Modulation Format
Open
ASK
Shorted to ground
FSK
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TDA5225 功能描述:射頻接收器 Multi-Ch Quad-Config Recvr w/Digi Slicer 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
TDA5225XUMA1 制造商:Infineon Technologies AG 功能描述:ENHANCED SENSITIVITY MULTI-CHANNEL QUAD-CONFIGURATION RECEIVER WITH DIGITAL SLICER 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 RCVR ASK/FSK MULTI QD 28TSSOP
TDA5230 功能描述:射頻接收器 LW PWR ASK/FSK SNGL CONVERSN MULT-CHAN 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
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