SA58646 Datasheet, PDF (25/42 Pages) NXP Semiconductors – UHF 900 MHz transceiver IC

NXP Semiconductors
SA58646
UHF 900 MHz transceiver IC
Table 20. Power amplifier output
Select PA_OUT[2:0]
Bit 2 Bit 1 Bit 0
-
0
X
X
0
1
0
0
1
1
0
1
2
1
1
0
3
1
1
1
Power amplifier
Output
power
(dBm)
Second
harmonic
(dBm)
PA inactive -
1.0
−17
1.9
−19
2.5
−23
3.0
−26
Third
harmonic
(dBm)
-
−27
−29
−33
−36
Fourth
harmonic
(dBm)
-
−34
−34
−36
−40
Table 21. Voltage reference adjust
Select REG_ADJ[2:0]
Bit 2 Bit 1 Bit 0
0
0
0
0
1
0
0
1
2
0
1
0
3
0
1
1
4
1
0
0
5
1
0
1
6
1
1
0
7
1
1
1
Nominal voltage reference
−7 %
−5 %
−3 %
−1 %
+1 %
+3 %
+5 %
+7 %
Table 22. Test mode
TM2 TM1 TM0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Select
normal operation
up or down RX
up or down TX
up or down RX or TX
reference divider output divided by 2
prescaler and main divider RX divided by 2
prescaler and main divider TX divided by 2
double synthesizers charge pump are in 3-state
Out-of-lock of synthesizers RX or TX can be indirectly monitored on pin CDLBD: the width
of the ‘glitch’ gives a direct measure of the phase error on the PLL RX and/or PLL TX.
To tune the external RX and TX VCO inductors, a defined divider ratio has to be
programmed on the dividers, and then the image of the VCO frequency can be read on
pin CDLBD.
It can also be used to check the divider ratio: force a frequency on VCO or crystal pins and
read the programmed frequency on pin CDLBD.
Before pin CDLBD, there is a divide-by-2, then all frequencies are divided by 2. When
charge pumps are in 3-state, the VCOs can be measured in stand-alone.
SA58646_1
Product data sheet
Rev. 01 — 8 February 2007
© NXP B.V. 2007. All rights reserved.
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