ATA5811 datasheet(20/90 Pages) ATMEL

20 / 90 page

ATA5811/ATA5812 [Preliminary]

4689B–RKE–04/04

Table 9 shows the relative changes of the output power of a typical device compared to

3.0 V/25°C. As can be seen a temperature change to -40° as well as to +105° reduces

the power by less than 1 dB due to the bandgap regulated output current. Measure-

ments of all the cases in Table 7 on page 19 over temperature and supply voltage have

shown about the same relative behavior as shown in Table 9

RX/TX Switch

The RX/TX switch decouples the LNA from the PA in TX mode, and directs the received

power to the LNA in RX mode. To do this, it has a low impedance to GND in TX mode

and a high impedance to GND in RX mode. To design a proper RX/TX decoupling

a linear simulation tool for radio frequency design together with the measured device

impedances of Table 1 on page 10, Table 7 on page 19, Table 10 and Table 11 on page

22 should be used, but the exact element values have to be found on board. Figure 17

on page 21 shows an approximate equivalent circuit of the switch. The principal switch-

ing operation is described here according to the application of Figure 4 on page 6. The

application of Figure 5 on page 7 works similarly.

Table 8. Measured Output Power and Supply Current at 433.92 MHz, PWR_H = GND

VS =

2.4 V

3.0 V

3.6 V

Tamb = -40°C

10.19 mA

3.8 dBm

10.19 mA

5.5 dBm

10.78 mA

6.2 dBm

amb = +25°C

10.62 mA

4.6 dBm

11.19 mA

6.2 dBm

11.79 mA

7.1 dBm

amb = +105°C

11.4 mA

3.8 dBm

12.02 mA

5.4 dBm

12.73 mA

6.3 dBm

Table 9. Measurements of Typical Output Power Relative to 3 V/25°

VS =

2.4 V

3.0 V

3.6 V

amb = -40°C

-2.4 dB

-0.7 dB

0 dB

amb = +25°C

-1.6 dB

0 dB

+0.9 dB

amb = +105°C

-2.4 dB

-0.8 dB

+0.1 dB

Table 10. Impedance of the RX/TX Switch RX_TX2 Shorted to GND

Frequency

Z(RX_TX1) TX Mode

Z(RX_TX1) RX Mode

315

MHz

(4.8 + j3.2)

Ω

(11.3 - j214)

Ω

433.92

MHz

(4.5 + j4.3)

Ω

(10.3 - j153)

Ω

868.3

MHz

(5 + j9)

Ω

(8.9 - j73)

Ω

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