參數(shù)資料
型號(hào)： TDA5221
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK Single Conversion Receiver
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)： 22/44頁(yè)
文件大?。?/td> 705K
代理商： TDA5221
Applications
4 - 2
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
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.
4
LNA
RSSI (0.8 - 2.8V)
VCC
Gain control
voltage
OTA
+3.1 V
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
R1
R2
Pins:
24
23
U
threshold
20k
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