TDA7210 Infineon Technologies, TDA7210 Datasheet - Page 33

• Manufacturer Part Number: TDA7210
• Description: IC RECEIVER FSK/ASK 28-TSSOP
• Manufacturer: Infineon Technologies
• Type: ASK/FSK Single Conversion Receiverr

Specifications of TDA7210

• Package / Case: 28-TSSOP
• Frequency: 810MHz ~ 870MHz, 400MHz ~ 440MHz
• Sensitivity: -110dBm
• Data Rate - Maximum: 100 kbps
• Modulation Or Protocol: ASK, FSK
• Applications: Remote Control, RKE, Security Systems
• Current - Receiving: 5.9mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Current: 7.7 mA
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: SP000524274; TDA7210; TDA7210INTR

Wireless Components
This circuit charges the capacitor C13 with an inrush current I
220µA for a duration of T
equal to the voltage U
2.5V. As soon as these voltages are equal or the duration T
precharge circuit is disabled.
τ
as
as the sum of R4 and R5 is sufficiently large and thus can be neglected. T2 can
then be calculated according to the following formula:
The voltage transient during the charging of C18 is shown in the following
figure:
Figure 4-11
The voltage appearing on the capacitor C13 connected to pin 20 is shown in the
following figure. It can be seen that due to the fact that it is charged by a con-
stant current source it exhibits is a linear increase in voltage which is limited to
U
input. The time constant appearing in this case can be denoted as T3, which
can be calculated with
2
Smax
is the time constant of the charging process of C18 which can be calculated
= 2.5V which is also the approximate operating point of the data filter
2.4V
3V
Voltage appearing on C18 during precharging process
U2
T3
=
s
4 - 12
at the input of the data filter. This voltage is limited to
T
U
----------------------------- -
l
2
Smax
=
220μA
until the voltage U
τ
2
τ
ln
2
⋅
⎛
⎜
⎜
⎜
⎜
⎝
2
=
C13
1
−
20
2
1
k ×
3
4 .
V
Ω
=
V
T2
⎞
⎟
⎟
⎟
⎟
⎠
---------------- - C13
220μA
C
≈
2,5V
18
τ
c
2
×
appearing on the capacitor is
1
6 .
⋅
Data Sheet, December 2008
2
is exceeded the
load
Applications
TDA7210
of typically
e-fkt1.WMF