TDK5101 Infineon Technologies, TDK5101 Datasheet - Page 28

• Manufacturer Part Number: TDK5101
• Description: TRANSMITTER ASK/FSK SGL TSSOP16
• Manufacturer: Infineon Technologies
• Type: Transmitterr

Specifications of TDK5101

• Package / Case: 16-TSSOP
• Frequency: 315MHz
• Applications: Alarm Systems, Communication Systems
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 20 kbps
• Power - Output: 5dBm
• Current - Transmitting: 7mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.1 V ~ 4 V
• Operating Temperature: -25°C ~ 85°C
• Operating Frequency: 317 MHz
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Product Depth (mm): 4.4mm
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: SP000014558; SP000014559; TDK5101T

Wireless Components
4.7 Application Hints on the Power-Amplifier
The power amplifier operates in a high efficient class C mode. This mode is
characterized by a pulsed operation of the power amplifier transistor at a current
flow angle of
passes the fundamental frequency component of the pulse spectrum of the
collector current to the load. The load and its resonance transformation to the
collector of the power amplifier can be generalized by the equivalent circuit of
Figure 4-6. The tank circuit L//C//RL in parallel to the output impedance of the
transistor should be in resonance at the operating frequency of the transmitter.
Figure 4-6
The optimum load at the collector of the power amplifier for “critical” operation
under idealized conditions at resonance is:
The theoretical value of R
“Critical” operation is characterized by the RF peak voltage swing at the
collector of the PA transistor to just reach the supply voltage V
The high degree of efficiency under “critical” operating conditions can be
explained by the low power losses at the transistor. During the conducting
phase of the transistor, its collector voltage is very small. This way the power
loss of the transistor, equal to i
small current flow angles of
In practice the RF-saturation voltage of the PA transistor and other parasitics
reduce the “critical” R
R
LC
V
2
P
S
O
2
Equivalent power amplifier tank circuit
<<
R
LC
. A frequency selective network at the amplifier output
LC
4 - 9
.
2
LC
*
for an RF output power of P
. 0
L
<<
3
C
00316
2
*u
C
CE
, is minimized. This is particularly true for
1423
R
V
L
S
Specification, October 2002
o
= 5 dBm (3.16 mW) is:
S
.
Applications
TDK 5101
Equivalent_power_wmf.