TDA5102 Infineon Technologies, TDA5102 Datasheet - Page 25

• Manufacturer Part Number: TDA5102
• Description: TRANSMITTER ASK/FSK SGL TSSOP16
• Manufacturer: Infineon Technologies
• Type: Transmitterr

Specifications of TDA5102

• Package / Case: 16-TSSOP
• Frequency: 915MHz
• Applications: Alarm Systems, Communication Systems
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 20 kbps
• Power - Output: 3.2dBm
• 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
• Operating Frequency: 925 MHz
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: SP000013432; TDA5102; TDA5102INTR; TDA5102INTR; TDA5102INTRINTR; TDA5102XT

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)