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參數(shù)資料
| 型號： | TDA5200 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | surface mount silicon Zener diodes |
| 中文描述： | 表面貼裝硅穩(wěn)壓二極管 |
| 文件頁數(shù)： | 22/43頁 |
| 文件大小： | 911K |
| 代理商： | TDA5200 |
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Applications
4 - 2
TDA 5200
Wireless Components
Specification, March 2000
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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