TDA5101 Infineon Technologies, TDA5101 Datasheet - Page 25

• Manufacturer Part Number: TDA5101
• Description: TRANSMITTER ASK/FSK P-TSSOP-16
• Manufacturer: Infineon Technologies

Specifications of TDA5101

• 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
• Package / Case: 16-TSSOP
• 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: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: TDA5101INTR

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 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 is specified within the electrical
characteristics at 9.84 MHz to a value of 11 µH. Therefore C6 is calculated to
8.0 pF.
CL:
ω:
L:
-R
4 - 5
crystal load capacitance for nominal frequency
angular frequency
inductivity of the crystal oscillator
Cv
=
CL
Cv
1
L
IC
=
+
1
ω
CL
1
2
L
+
1
=
ω
C
f, CL Cv
2
L
6
Specification, October 2001
Formula 1)
Applications
TDA 5101