MC72000 Freescale Semiconductor, MC72000 Datasheet - Page 43

• Manufacturer Part Number: MC72000
• Description: Integrated Bluetooth Radio
• Manufacturer: Freescale Semiconductor

6.4.6 Programmable LPA
The output power of the LPA can be varied by programming PA Bias Adjust (R5/2-0) in the register map.
Table 21 displays the response of RF output power, current consumption and 2
with respect to the programmable bit settings. Class 1 operations are supported through the use of an
external power amplifier not shown here. Refer to Section 10.6, “Class 1 Operation,” for more detail.
Figure 18 and Figure 19 provide additional LPA characteristic data.
The LPA also includes a ramp generator which has an exponential ramp up/ramp down function with a
maximum settling time of 20 µs. Increasing the output power exponentially is useful to avoid splattering
and minimize load pulling.
6.4.7 External Balun
The LPA provides a differential output that is converted to a single-ended signal through the use of an
inexpensive printed circuit board balun. Optionally, an external discrete balun may be used. Figure 20 and
Figure 92 show the physical dimensions and characteristics of this network. Table 22 shows the output
impedance, S22 of the PA during active and inactive cycles.
MOTOROLA
R5/2
0
0
0
0
1
1
1
1
PA Bias Adjust
R5/1
0
0
1
1
0
0
1
1
Freescale Semiconductor, Inc.
Table 21. RF Power Out vs. PA Bias Adjust
For More Information On This Product,
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
R5/0
0
1
0
1
0
1
0
1
Preliminary
Output Power
(dBm)
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Consumption
Transmit)(mA)
(Continuous
Radio Functional Description
Current
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nd
Harmonic power level
2
nd
Harmonic
(dBc)
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