AX5043 datasheet(7/47 Pages) ONSEMI

7 / 47 page

AX5043

www.onsemi.com

Table 3. SUPPLIES

Units

Max

Typ

Min

Condition

Description

Symbol

ITX−DIFF

Current consumption TX

differential

868 MHz, 16 dBm, FSK, Note 2

RF Frequency Subsystem:

Internal VCO and loop−filter

Antenna configuration: Differential PA

ITX−SE

Current consumption TX

single ended

868 MHz, 0 dBm, FSK,

RF Frequency Subsystem:

Internal VCO and loop−filter

Antenna configuration:

Single ended PA, external RX/TX switch-

ing

7.5

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

2. Measured with optimized matching networks.

For information on current consumption in complex

modes of operation tailored to your application, see the

software AX−RadioLab for AX5043.

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 AX5043 power amplifier although

over 90% are theoretically possible. A typical matching

network has between 1 dB and 2 dB loss (Ploss). 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

ITX[mA] +

PAefficiency

Pout[dBm])Ploss[dB]

B 1.8V ) Ioffset

Ioffset is about 6 mA for the fully integrated VCO at

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

inductor at 169 MHz. The following table shows calculated

current consumptions versus output power for Ploss = 1 dB,

PAefficiency = 0.5, Ioffset= 6 mA at 868 MHz and Ioffset=

3.5 mA at 169 MHz.

Table 4. CURRENT CONSUMPTION VS. OUTPUT

POWER

Pout [dBm]

Itxcalc [mA]

868 MHz

169 MHz

7.5

4.5

7.9

4.9

8.4

5.4

9.0

6.0

9.8

6.8

10.8

7.8

12.1

9.1

13.7

10.7

15.7

12.7

18.2

15.2

21.3

18.3

25.3

22.3

30.3

27.3

36.7

33.7

44.6

41.6

54.6

51.6

Both AX5043 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.

AX5043 Datasheet(PDF) 7 Page - ON Semiconductor

AX5043 Datasheet(HTML) 7 Page - ON Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

Datasheet Download

Link URL