TDK5100GEG Infineon Technologies, TDK5100GEG Datasheet - Page 26
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TDK5100GEG
Manufacturer Part Number
TDK5100GEG
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDK5100GEG.pdf
(40 pages)
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
3.5 Application Hints on the Crystal Oscillator
1. Application Hints on the crystal oscillator
The crystal oscillator achieves a turn on time less than 1 msec when the
specified crystal is used. To achieve this, a NIC oscillator type is implemented
in the TDK 5100. 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 13.56 MHz and a crystal
load capacitance of CL = 20 pF. The inductance L at 13.5 MHz is about 4.6 H.
Therefore C6 is calculated to 12 pF.
Cv
CL:
L:
:
CL
1
-R
3 - 7
crystal load capacitance for nominal frequency
angular frequency
inductance of the crystal oscillator
Cv
1
2
L
CL
1
L
IC
1
2
L
Formula 1)
f, CL Cv
C
6
Specification, October 2002
Applications
TDK 5100