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參數資料
| 型號： | TDA5212 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK 915MHz Single Conversion Receiver |
| 中文描述： | 詢價/ FSK信號915MHz單一轉換接收器 |
| 文件頁數： | 19/51頁 |
| 文件大小： | 1222K |
| 代理商： | TDA5212 |
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Functional Description
3 - 11
TDA 5212
preliminary
Wireless Components
Specification, May 2003
3.4.4
Crystal Oscillator
The on-chip crystal oscillator circuitry allows for utilisation of quartzes both in
the 7 and 14MHz range as the overall division ratio of the PLL can be switched
between 64 and 128 via the
CSEL
(Pin 16 ) pin according to the following table.
The calculation of the value of the necessary quartz load capacitance is shown
in Section 4.3, the quartz frequency calculation is expained in Section 4.4.
3.4.5
Limiter
The Limiter is an AC coupled multistage amplifier with a cumulative gain of
approximately 80dB that has a bandpass-characteristic centred around
10.7MHz. It has an input impedance of 330
10.7MHz ceramic IF filter. The limiter circuit acts as a Receive Signal Strength
Indicator (RSSI) generator which produces a DC voltage that is directly propor-
tional to the input signal level as can be seen in Figure 4-2. This signal is used
to demodulate the ASK receive signal in the subsequent baseband circuitry and
to turn down the LNA gain by approximately 18dB in case the input signal
strength is too strong as described in Section 3.4.1 and Section 4.1.
to allow for easy interfacing to a
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 180μV/kHz. The passive loop filter output that is
comprised fully on chip is fed to both the VCO and the modulation format
switch.This signal is representing the demodulated signal. This switch is actu-
ally 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.
Table 3-2 CSEL Pin Operating States
CSEL
Crystal Frequency
Open
7.xx MHz
Shorted to ground
14.xx MHz
Table 3-3 MSEL Pin Operating States
MSEL
Modulation Format
Open
ASK
Shorted to ground
FSK
相關PDF資料 |
PDF描述 |
|---|---|
| TDA5220 | ASK/FSK Single Conversion Receiver |
| TDA5221 | ASK/FSK Single Conversion Receiver |
| TDA5250 | ASK/FSK 868MHz Wireless Transceiver |
| TDA5250D2 | ASK/FSK 868MHz Wireless Transceiver |
| TDA5251F1 | ASK/FSK 315MHz Wireless Transceiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TDA5212_06 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 915MHz Single Conversion Receiver |
| TDA5212T | 制造商:Infineon Technologies AG 功能描述:915MHZ ASK/FSK SUPHET RCVR TSS |
| TDA5212XUMA1 | 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:RF Receiver ASK/FSK 5V 28-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:IC FSK/ASK RECEIVER P-TSSOP-28 |
| TDA5220 | 功能描述:射頻接收器 ASK/FSK SINGLE CONVERSION RECEIVER 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 |
| TDA5220T | 制造商:Infineon Technologies AG 功能描述:RKE RX RECIEVER, TSSOP-28, 3K |
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