TDA5210 Infineon Technologies, TDA5210 Datasheet - Page 23
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TDA5210
Manufacturer Part Number
TDA5210
Description
IC LP FSK/ASK SHR P-TSSOP-28
Manufacturer
Infineon Technologies
Type
Receiverr
Datasheet
1.TDA5210.pdf
(53 pages)
Specifications of TDA5210
Package / Case
28-TSSOP
Frequency
810MHz ~ 870MHz, 400MHz ~ 440MHz
Sensitivity
-107dBm
Modulation Or Protocol
ASK, FSK
Applications
Alarm Systems, Communication Systems
Current - Receiving
4.8mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Voltage - Supply
4.6 V ~ 5.5 V
Operating Temperature
-40°C ~ 105°C
Operating Frequency
870 MHz
Operating Supply Voltage
5 V
Maximum Operating Temperature
+ 150 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Operating Temperature (min)
-40C
Operating Temperature Classification
Automotive
Product Depth (mm)
4.4mm
Product Length (mm)
9.7mm
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Memory Size
-
Data Rate - Maximum
-
Lead Free Status / Rohs Status
Compliant
Other names
SP000016384
TDA5210INTR
TDA5210INTR
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Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
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Part Number:
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Wireless Components
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.
Figure 4-1
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
value between approximately 0.8 and 2.8V to provide a switching point within
the receive signal dynamic range.
This voltage U
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
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.
thres
. As shown in the following figure the threshold voltage can have any
LNA Automatic Gain Control Circuitry
thres
Pins:
RSSI > U
RSSI < U
is applied to the THRES pin (Pin 23) The threshold voltage
th r es h o ld
th r es h o ld
4 - 2
thres
24
: I
: I
lo a d
lo a d
, the OTA generates a positive current I
20k
=4.2µA
= -1.5µA
+3.1 V
C
4
R1
U
I
C
lo a d
U
U
U
U
c
c
c ma x
c min
:< 2.6V : Gain high
:> 2.6V : Gain low
23
= 1.67V
= V
OTA
C C
U
th re s h old
- 0.7V
Gain control
R2
voltage
VCC
RSSI (0.8 - 2.8V)
LNA
Specification, May 2001
Applications
TDA 5210
load
LNA_autom.wmf
. This