參數(shù)資料
型號(hào)： TDA5204E1
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK Single Conversion Receiver 390MHz
中文描述： 調(diào)幅單一轉(zhuǎn)換接收390MHz
文件頁(yè)數(shù)： 21/40頁(yè)
文件大?。?/td> 1241K
代理商： TDA5204E1
RSSI < U
threshold
: I
load
= -1.5μA
Applications
4 - 2
TDA 5204 E1
preliminary
Wireless Components
Specification, January 2001
4.1
LNA and Automatic Gain Control (AGC)
The AGC extends the dynamic range of the receiver.
The automatic gain control in the TDA5204 is a narrow-band control loop which
compares the receive signal strength signal (RSSI, 0.8V to 2.8V) from the lim-
iter with a fixed threshold voltage applied to
pin 23
(THRES).
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 fixed voltage on
pin 23
is generated on the external voltage divider. The
comparator is a transimpedance amplifier (OTA), which creates a positive cur-
rent (+4.2uA) in the case the RSSI level is larger than the threshold voltage.
Otherwise the current is -1.5uA. This leads to an asymmetric fast-attack and
slow-release behaviour and thus to fast reaction to the low gain mode and slow
reaction to the high gain mode.
This current is converted into a control voltage over an external capacitor C
attached to
pin 4
(TAGC) which defines the gain of the LNA. The limits of the
control voltages for the LNA on pin4 are 1.67V for high gain mode and Vcc-0.7V
for low gain mode.
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
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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