TDK5101XT Infineon Technologies, TDK5101XT Datasheet - Page 25
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TDK5101XT
Manufacturer Part Number
TDK5101XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDK5101XT.pdf
(39 pages)
Specifications of TDK5101XT
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
4.5 Application Hints on the crystal oscillator
As mentioned before, the crystal oscillator achieves a turn on time less than
1 msec. To achieve this, a NIC oscillator type is implemented in the TDK 5101.
The input impedance of this oscillator is a negative resistance in series to an
inductance. Therefore the load capacitance of the crystal CL (specified by the
crystal supplier) is transformed to the capacitance Cv.
Example for the ASK-Mode:
Referring to the application circuit, in ASK-Mode the capacitance C7 is replaced
by a short to ground. Assume a crystal frequency of 9.84 MHz and a crystal load
capacitance of CL = 12 pF. The inductance L at 9.84 MHz is about 4.4 H.
Therefore C6 is calculated to 10 pF.
CL:
L:
:
-R
4 - 6
crystal load capacitance for nominal frequency
angular frequency
inductance of the crystal oscillator
Cv
Cv
CL
CL
1
L
IC
1
1
1
2
L
2
L
C
f, CL Cv
6
(1)
Specification, October 2002
Applications
TDK 5101