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)： 17/44頁(yè)
文件大小： 705K
代理商： TDA5221
Functional Description
3 - 9
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
3.3
Functional Block Diagram
Functional_diagram_5221.wmf
Figure 3-2
Main Block Diagram
3.4
Functional Blocks
3.4.1
Low Noise Amplifier (LNA)
The LNA is an on-chip cascode amplifier with a voltage gain of 15 to 20dB. The
gain figure is determined by the external matching networks situated ahead of
LNA and between the LNA output
LNO
(Pin 6) and the Mixer Inputs
MI
and
MIX
(Pins 8 and 9). The noise figure of the LNA is approximately 3dB, the current
consumption is 500μA. The gain can be reduced by approximately 18dB. The
switching point of this AGC action can be determined externally by applying a
threshold voltage at the
THRES
pin (Pin 23). This voltage is compared internally
with the received signal (RSSI) level generated by the limiter circuitry. In case
that the RSSI level is higher than the threshold voltage the LNA gain is reduced
and vice versa. 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 as
described in Section 4.1. The time constant of the AGC action can be deter-
mined by connecting a capacitor to the
TAGC
pin (Pin 4) and should be chosen
along with the appropriate threshold voltage according to the intended operat-
PDO
: 2
VCO
: 128
: 129
Φ
DET
COSC
DATA
Crystal
PDWN
FSEL
Loop
Filter
Bandgap
Reference
LNA
RF
TAGC
VCC
VCC
AGND
AGC
Reference
THRES
3VOUT
FSK
PLL Demod
OTA
LNI
DGND
-
+
MIX
LNO
MI
OPP
FFB
SLP
VCC
LIM
LIMX
FIF
IFO
SLN
MSEL
LIMITER
6
8
9
12
17
18
22
21
19
20
25
26
23
24
3
4
14
13
2,7
5,10
15
11
1
28
27
-
+
ASK
FSK
OP
-
+
: 2
SSEL
16
DATA-
SLICER
-
+ CM
U
REF
-
+
CP
Logic
H=ASK
L=FSK
DETECTOR
PEAK
TDA 5221
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