參數(shù)資料
型號(hào)： TDA5220
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?。?/td> 719K
代理商： TDA5220
Functional Description
3 - 9
TDA 5220
preliminary
Wireless Components
confidential
Target Specification, October 2001
3.3
Functional Block Diagram
Function_5220.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
the 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 and 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 com-
pared 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 determined by connecting a capacitor to the
TAGC
pin (Pin 4) and
should be chosen along with the appropriate threshold voltage according to the
PDO
: 1
: 2
VCO
: 64
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
IF
Filter
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
-
+
SSEL
16
DATA-
SLICER
-
+ CM
U
REF
-
+
CP
Logic
H=ASK
L=FSK
DETECTOR
PEAK
TDA 5220
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