TDK5100GEG Infineon Technologies, TDK5100GEG Datasheet - Page 28

• Manufacturer Part Number: TDK5100GEG
• Manufacturer: Infineon Technologies

Specifications of TDK5100GEG

• 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: Compliant

Wireless Components
3.6 Design Hints on the Clock Output (CLKOUT)
If the FSK switch is closed, Cv_ is equal to Cv1 (C6 in the application diagram).
If the FSK switch is open, Cv2 (C7 in the application diagram) can be calculated.
Csw:
Remark:
The CLKOUT pin is an open collector output. An external pull up resistor (RL)
should be connected between this pin and the positive supply voltage. The
value of RL is depending on the clock frequency and the load capacitance CLD
(PCB board plus input capacitance of the microcontroller). RL can be calculated
to:
Remark: To achieve a low current consumption and a low
Even harmonics of the signal at CLKOUT can interact with the crystal oscillator
input COSC preventing the start-up of oscillation. Care must be taken in layout
by sufficient separation of the signal lines to ensure sufficiently small coupling.
Table 3-2
CL pF
5
10
20
RL
parallel capacitance of the FSK switch (3 pF incl. layout parasitics)
spurious radiation, the largest possible RL should be chosen.
These calculations are only approximations. The necessary values
depend on the layout also and must be adapted for the specific
application board.
fCLKOUT=
Cv
fCLKOUT
847 kHz
2
C
3 - 9
RL kOhm
7
1
*
6.8
27
12
Csw
8
*
CLD
Cv
1
(
Cv
(
Cv
)
CL pF
)
10
20
Cv
5
(
Cv
1
Specification, October 2002
1
fCLKOUT=
3.39 MHz
Csw
)
RL kOhm
Applications
TDK 5100
6.8
3.3
1.8