AX8052F143

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8

Table 4. SUPPLIES

Units

Max

Typ

Min

Condition

Description

Sym

Current consumption TX

single ended

868 MHz, 0 dBm, FSK, Note 3

RF frequency generation subsystem:

Internal VCO and internal loop−filter

Antenna configuration:

Single ended PA, external RX/TX

switching

7.5

mA

Microcontroller running power

consumption

All peripherals disabled

150

mA/

MHz

Voltage supervisor

Run and standby mode

85

mA

Crystal oscillator current

(RF reference oscillator)

16 MHz

160

mA

Low frequency crystal oscillator current

32 kHz

700

nA

Internal oscillator current

20 MHz

210

mA

Internal Low Power Oscillator current

10 kHz

650

nA

640 Hz

210

nA

ADC current

311 kSample/s, DMA 5 MHz

1.1

mA

Typical wake−on−radio duty cycle current

1s, 100 kbps

6

mA

1. If VDD_IO ramps cannot be guaranteed, an external reset circuit is recommended, see the AX8052 Application Note: Power On Reset

2. Digital circuitry is functional down to typically 1 V.

3. Measured with optimized matching networks.

For information on current consumption in complex

modes of operation tailored to your application, see the

software AX−RadioLab.

Note on current consumption in TX mode

To achieve best output power the matching network has to

be optimized for the desired output power and frequency. As

a rule of thumb a good matching network produces about

50% efficiency with the AX8052F143 power amplifier

although over 90% are theoretically possible. A typical

The theoretical efficiencies are the same for the single ended

PA (ANTP1) and differential PA (ANTP and ANTN)

therefore only one current value is shown in the table below.

We recommend to use the single ended PA for low output

power and the differential PA for high power. The

differential PA is internally multiplexed with the LNA on

pins ANTP and ANTN. Therefore constraints for the RX

matching have to be considered for the differential PA

matching.

The current consumption can be calculated as

1

10

Pout[dBm])Ploss[dB]

10

MHz to 1050 MHz, and 3 mA for the VCO with external

inductor at 169 MHz. The following table shows calculated

3.5 mA at 169 MHz.

Table 5. CURRENT CONSUMPTION VS. OUTPUT

POWER

Pout [dBm]

868 MHz

169 MHz

0

7.5

4.5

1

7.9

4.9

2

8.4

5.4

3

9.0

6.0

4

9.8

6.8

5

10.8

7.8

6

12.1

9.1

7

13.7

10.7

8

15.7

12.7

9

18.2

15.2

10

21.3

18.3

11

25.3

22.3

12

30.3

27.3

13

36.7

33.7

14

44.6

41.6

15

54.6

51.6

Both AX8052F143 power amplifiers run from the

regulated VDD_ANA supply and not directly from the

battery. This has the advantage that the current and output

power do not vary much over supply voltage and

temperature.