TDA7110 Infineon Technologies, TDA7110 Datasheet - Page 30

• 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
As Figure 3-6 shows, detuning beyond the bandwidth of the matching circuit
results in an increase of the collector current of the power amplifier and in some
loss of output power. This diagram shows the data for the circuit of the test
board at the frequency of 434 MHz. The behaviour at 868 MHz is similar. The
effective load resistance of this circuit is R
impedance for operation at 3 V. This will lead to a dip of the collector current of
approx. 10%.
Figure 3-6
C3, L2-C2 and C8 are the main matching components which are used to
transform the 50 Ω load at the SMA-RF-connector to a higher impedance at the
PA-output (250 Ω @ 3 V). L1 can be used for some finetuning of the resonant
frequency but should not become too small in order to keep its losses low.
The transformed impedance of 250+j0 Ω at the PA-output-pin can be verified
with a network analyzer using the following measurement procedure:
1. Calibrate your network analyzer.
2. Connect some short, low-loss 50 Ω cable to your network analyzer with an
3. Use the „Port Extension“ feature of your network analyzer to shift the refer-
4. Connect the center-conductor of the cable to the solder pad of the pin „PA“
5. Screw a 50 Ω dummy-load on the RF-I/O-SMA-connector
6. Be sure that your network analyzer is AC-coupled and turn on the power
7. Measure the S-parameter S11
open end on one side. Semirigid cable works best.
ence plane of your network analyzer to the open end of the cable.
of the IC. The outer conductor has to be grounded. Very short connections
have to be used. Do not remove the IC or any part of the matching-compo-
nents!
supply of the IC. The TDA7110 has to be in PLL-Enable-Mode.
16
14
12
10
8
6
4
2
0
375
Output power and collector current vs. frequency
400
3 - 10
425
f [MHz]
450
L
= 250 Ω, which is the optimum
475
Data Sheet, December 2008
500
434 MHz / 3V
TDA7110
Is [mA]
Pout [dBm]
Applications
TDA7110
pout_vs_frequ.wmf