TDK5111 Infineon Technologies, TDK5111 Datasheet - Page 15

• Manufacturer Part Number: TDK5111
• Description: TRANSMITTER ASK/FSK SGL TSSOP16
• Manufacturer: Infineon Technologies
• Type: Transmitterr

Specifications of TDK5111

• Package / Case: 16-TSSOP
• Frequency: 314MHz ~ 317MHz
• Applications: Alarm Systems, Communication Systems
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 20 kbps
• Power - Output: 10dBm
• Current - Transmitting: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.1 V ~ 4 V
• Operating Temperature: -40°C ~ 125°C
• Operating Frequency: 317 MHz
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: SP000014016; SP000014017; TDK5111T

Wireless Components
3.4.3 Power Amplifier
For operation at 315 MHz, the power amplifier is fed with the VCO frequency
divided by 2. It is possible to feed the power amplifier directly from the voltage
controlled oscillator. This is controlled by FSEL (pin 15) as described in the
table below. This is not recommended for this frequency range.
The Power Amplifier can be switched on and off
by the signal at ASKDTA (pin 6).
The Power Amplifier has an Open Collector output at PAOUT (pin 14) and
requires an external pull-up coil to provide bias. The coil is part of the tuning and
matching LC circuitry to get best performance with the external loop antenna.
To achieve the best power amplifier efficiency, the high frequency voltage swing
at PAOUT (pin 14) should be twice the supply voltage.
The power amplifier has its own ground pin PAGND (pin 13) in order to reduce
the amount of coupling to the other circuits.
In all 315 MHz applications, the pin FSEL is connected to ground.
3.4.4 Low Power Detect
The supply voltage is sensed by a low power detector. When the supply voltage
drops below 2.15 V, the output LPD (pin 2) switches to the low-state. To mini-
mize the external component count, an internal pull-up current of 40 µA gives
the output a high-state at supply voltages above 2.15 V.
The output LPD (pin 2) can either be connected to ASKDTA (pin 6) to switch off
the PA as soon as the supply voltage drops below 2.15 V or it can be used to
inform a micro-controller to stop the transmission after the current data packet.
Table 3-5
Table 3-6
1) Low:
2) Open:
1) Low:
2) Open:
3) High:
ASKDTA (pin 6)
Open
FSEL (pin 15)
Open
Low
Low
Voltage at pin < 0.5 V
Pin open
Voltage at pin < 0.5 V
Pin open
Voltage at pin > 1.5 V
2)
, High
1)
1)
2)
3 - 9
3)
630 MHz (not recommended)
Radiated Frequency Band
Power Amplifier
Specification, October 2002
Functional Description
315 MHz
OFF
ON
TDK 5111