參數(shù)資料
型號(hào)： TDA5212
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK 915MHz Single Conversion Receiver
中文描述： 詢價(jià)/ FSK信號(hào)915MHz單一轉(zhuǎn)換接收器
文件頁(yè)數(shù)： 32/51頁(yè)
文件大小： 1222K
代理商： TDA5212
Applications
4 - 11
TDA 5212
preliminary
Wireless Components
Specification, May 2003
4.7
Principle of the Precharge Circuit
In case the data slicer threshold shall be generated with an external RC network
as described in Section 4.5 it is necessary to use large values for the capacitor
C attached to the
SLN
pin (pin 20) in order to achieve long time constants. This
results also from the fact that the choice of the value for R connected between
the
SLP
and
SLN
pins (pins 19 and 20) is limited by the 330k resistor appear-
ing in parallel to R as can be seen in Figure 4-6. Apart from this a resistor value
of 100k leads to a voltage offset of 1mv at the comparator input as described
in Section 4.6.1. The resulting startup time constant
1
can be calculated with:
1
= (R // 330k ) · C
In case R is chosen to be 100k and C is chosen as 47nF this leads to
1
= (100k // 330k ) · 47nF = 77k · 47nF = 3.6ms
When the device is turned on this time constant dominates the time necessary
for the device to be able to demodulate data properly. In the powerdown mode
the capacitor is only discharged by leakage currents.
In order to reduce the turn-on time in the presence of large values of C a pre-
charge circuit was included in the TDA5210 as shown in the following figure.
precharge.WMF
Figure 4-10
Principle of the precharge circuit
I
load
+3.1V
20k
+
-
OTA
+2.4V
R1
R2
24
23
U
threshold
C
0 / 240uA
+
-
20
19
R
Data Filter
ASK/FSK Swtch
C2
U2
Us
Uc
Uc<Us
Uc>Us
U2<2.4V : I=240uA
U2>2.4V : I=0
R1+R2=600k
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)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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