TDA7110 Infineon Technologies, TDA7110 Datasheet - Page 25

• Manufacturer Part Number: TDA7110
• Description: IC TRANSMITTER ASK/FSK 16-TSSOP
• Manufacturer: Infineon Technologies
• Type: ASK/FSK Transmitterr

Specifications of TDA7110

• Package / Case: 16-TSSOP
• Frequency: 433 ~ 435MHz; 866 ~ 870MHz
• Applications: Alarm Systems, Communication Systems
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 20 kbps
• Power - Output: 11dBm
• Current - Transmitting: 15.7mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.1 V ~ 4 V
• Operating Temperature: -40°C ~ 85°C
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Supply Current: 13.8 mA
• Supply Voltage (max): 4 V
• Supply Voltage (min): 2.1 V
• 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: SP000524278; TDA7110; TDA7110INTR

Wireless Components
3.4 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 TDA7110. 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 = 12 pF. The inductance L at 13.5 MHz is about 4.6 μH.
Therefore C6 is calculated to 8.567 pF, but due to parasitic capacitors of the
board C6 usually has to be smaller (e.g. 6.8 pF in the ASK evalboard)
CL:
ω:
L:
-R
3 - 5
crystal load capacitance for nominal frequency
angular frequency
inductance of the crystal oscillator
Cv
Cv
=
TDA7110
=
CL
1
L
CL
1
+
1
ω
+
1
2
ω
L
2
=
L
C
f, CL Cv
6
(1)
Data Sheet, December 2008
Applications
TDA7110