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Micrel
Transmitter
Power Amplifier
MICRF506
A6..A0
0000000
0000001
0000010
D7
LNA_by
Modulation1
CP_HI
D6
PA2
Modulation0
SC_by
D5
PA1
‘0’
‘0’
D4
PA0
‘0’
PA_By
D3
Sync_en
RSSI_en
OUTS3
D2
Mode1
LD_en
OUTS2
D1
Mode0
PF_FC1
OUTS1
D0
Load_en
PF_FC0
OUTS0
The maximum output power is approximately 10dBm
Frequency Modulation
for a 50 ? load. For maximum output power the load
seen by the PA must be resistive. Higher output
A6..A0
0000001
D7
Modulation1
D6
Modulation0
D5
‘0’
D4
‘0’
D3
RSSI_en
D2
LD_en
D1
PF_FC1
D0
PF_FC0
power can be obtained by decreasing the load
impedance. However, this will be in conflict with
obtaining impedance match in the LNA. The output
power is programmable in seven steps, with
approximately 3dB between each step. This is
controlled by bits PA2 – PA0.
The power amplifier can be turned off by setting PA2
– PA0 = 0.
Modulation1
0
0
1
1
Modulation0
0
1
0
1
Modulation Type
Closed loop modulation
using modulator
Not in use
FSK applied using two
sets of dividers
Not in use
3 harmonic:
<-8dBm
For all other combinations the PA is on and has
maximum power when PA2 – PA0 = 1.
The PA will be bypassed if PA_by=1. Output power
will drop ~22dB. It is still possible to control the
power by PA2 – PA0.
The output power varies about 3dB over power
supply 2.0V to 2.5V and about 2dB over temperature
-40 ? C to +85 ? C. The 2 nd and 3 rd harmonic of the PA
are as follows:
2 nd harmonic: <-16dBm
rd
To reduce the emission of harmonics, an LC filter
can be added between the ANT pin and the antenna
as shown in Figure 15.
Table 11. Modulation Bit Setting
When Modulation1 and Modulation0 is 00, the
modulator needs to be programmed properly, see
“Modulator” section. The modulation signal will now
be applied directly on the phase locked VCO. It is
therefore important that the PLL bandwidth is not too
high, as this will remove the modulation. See “PLL
Filter” section on how to calculate the PLL
components. When using the modulator the
modulation signal is applied to the VCO and
therefore some sort of encoding is needed.
The level of encoding is determined by the PLL loop
filter bandwidth and data rate. Two of the most
common encoding techniques are Manchester
encoding and 3B4B. Other encoding schemes may
also be used.
C5
L1
Manchester encoding is when one bit is encoded in
ANT
47pF
C4
18pF
12nH
15pF
C6
to a two-bit word and is shown in Table 10. When
using Manchester encoding the maximum overhead
is 100%. When selecting PLL loop filter it is
important to note that the min baud rate is equal to:
f baud_min =
baud /s
4
Figure 15. LC Filter
This filter is designed for the 434MHz band with
50Ohm terminations. The component values may
f baud_min : The minimum frequency of the baud
rate [Hz]
baud/s: Elements per second (encoded data)
have to be tuned to compensate for the layout
parasitics. This filter may also increase the receiver
selectivity.
July 2006
24
Data
“0”
“1”
Word
“10”
“01”
M9999-092904
+1 408-944-0800
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