TDA5102NT Infineon Technologies, TDA5102NT Datasheet - Page 25

• Manufacturer Part Number: TDA5102NT
• Manufacturer: Infineon Technologies

Specifications of TDA5102NT

• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Product Depth (mm): 4.4mm
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Lead Free Status / Rohs Status: Not Compliant

Wireless Components
4.4 Hints
1. 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 TDA 5102.
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 14.3 MHz and a crystal load
capacitance of CL = 20 pF. The inductance L is specified within the electrical
characteristics at 14.3 MHz to a value of 11 µH. Therefore C6 is calculated to
7.2 pF.
CL:
ω:
L:
-R
4 - 5
crystal load capacitance for nominal frequency
angular frequency
inductivity of the crystal oscillator
Cv
=
CL
1
L
IC
+
1
ω
Cv
2
L
=
=
CL
C
1
f, CL Cv
6
+
1
ω
2
L
Specification, October 2001
Applications
TDA 5102
Formula 1)