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參數(shù)資料
| 型號： | TDA5201 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK Single Conversion Receiver |
| 中文描述： | 調(diào)幅單一轉(zhuǎn)換接收器 |
| 文件頁數(shù)： | 22/43頁 |
| 文件大?。?/td> | 689K |
| 代理商： | TDA5201 |
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Applications
4 - 2
TDA 5201
Wireless Components
Specification, July 2004
4.1
Choice of LNA Threshold Voltage and Time Constant
In the following figure the internal circuitry of the LNA automatic gain control is
shown.
LNA_autom.wmf
Figure 4-1
LNA Automatic Gain Control Circuitry
The LNA automatic gain control circuitry consists of an operational transimped-
ance amplifier that is used to compare the received signal strength signal
(RSSI) generated by the Limiter with an externally provided threshold voltage
U
thres
. As shown in the following figure the threshold voltage can have any
value between approximately 0.8 and 2.8V to provide a switching point within
the receive signal dynamic range.
This voltage U
thres
is applied to the
THRES
pin (Pin 23) The threshold voltage
can be generated by attaching a voltage divider between the
3VOUT
pin
(Pin 24) which provides a temperature stable 3V output generated from the
internal bandgap voltage and the
THRES
pin. If the RSSI level generated by the
Limiter is higher than U
thres
, the OTA generates a positive current I
load
. This
yields a voltage rise on the
TAGC
pin (Pin 4). Otherwise, the OTA generates a
negative current. These currents do not have the same values in order to
achieve a fast-attack and slow-release action of the AGC and are used to
charge an external capacitor which finally generates the LNA gain control volt-
age.
Pins:
24
23
4
LNA
R4
R5
U
threshold
RSSI (0.8 - 2.8V)
VCC
Gain control
voltage
OTA
+3V
I
load
RSSI > U
threshold
: I
load
=4.2μA
RSSI < U
threshold
: I
load
= -1.5μA
U
C
C
U
c
:< 2.6V : Gain high
U
c
:> 2.6V : Gain low
U
cmax
= V
- 0.7V
U
cmin
= 1.67V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TDA5201_10 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK Single Conversion Receiver |
| TDA5201GEG | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TDA5201NT | 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK 5V 28-Pin TSSOP |
| TDA5201T | 功能描述:RCVR SGL CONV 310-350MHZ 28TSSOP RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標(biāo)準(zhǔn)包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應(yīng)用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| TDA5201XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK 5V T/R 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK 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 LP SGL CONV ASK P-TSSOP-28 |
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