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Fabricante

TDK5111

ASK/FSK Transmitter 315 MHz

Infineon Technologies 

TDK 5111

Functional Description

3.4.5 Power Modes

The IC provides three power modes, the POWER DOWN MODE, the PLL

ENABLE MODE and the TRANSMIT MODE.

3.4.5.1 Power Down Mode

In the POWER DOWN MODE the complete chip is switched off.

The current consumption is typically 0.25 nA at 3 V 25°C.

This current doubles every 8°C. The values for higher temperatures are

typically 14 nA at 85°C and typically 600 nA at 125°C.

3.4.5.2 PLL Enable Mode

In the PLL ENABLE MODE the PLL is switched on but the power amplifier is

turned off to avoid undesired power radiation during the time the PLL needs to

settle. The turn on time of the PLL is determined mainly by the turn on time of

the crystal oscillator and is less than 1 msec when the specified crystal is used.

The current consumption is typically 4 mA.

3.4.5.3 Transmit Mode

In the TRANSMIT MODE the PLL is switched on and the power amplifier is

turned on too.

The current consumption of the IC is typically 13 mA when using a proper trans-

forming network at PAOUT, see Figure 4-1.

3.4.5.4 Power mode control

The bias circuitry is powered up via a voltage V > 1.5 V at the pin PDWN (pin 1).

When the bias circuitry is powered up, the pins ASKDTA and FSKDTA are

pulled up internally.

Forcing the voltage at the pins low overrides the internally set state.

Alternatively, if the voltage at ASKDTA or FSKDTA is forced high externally, the

PDWN pin is pulled up internally via a current source. In this case, it is not nec-

essary to connect the PDWN pin, it is recommended to leave it open.

The principle schematic of the power mode control circuitry is shown in

Figure 3-5.

Wireless Components

3 - 10

Specification, October 2002

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