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SX1223I073TRT Datasheet(PDF) 9 Page - Semtech Corporation

Part # SX1223I073TRT
Description  425 - 475 MHz / 850 - 950 MHz Integrated UHF Transmitter
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

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SX1223
the user according to the selected frequency band, whereas the three VCO_IB bits can be either forced by the user
or set automatically by the circuit which will select the combination having the best phase noise. This automatic
setting can be enabled by setting the three VCO_IB bits to ‘0’.
Table 2 lists the bias setting used for the different VCO_freq settings in automatic mode. When any of the VCO_IB
bit is set to 1, it will overrule the automatic setting.
RF frequency
VCO_IB2
VCO_IB1
VCO_IB0 VCO_freq1 VCO_freq0
425/850 MHz
1
1
1
0
0
434/868 MHz
1
0
1
0
1
457/915 MHz
0
1
1
1
0
475/950 MHz
0
0
0
1
1
Table 2: VCO bit settings.
The bias bits optimize the phase noise, and the frequency bits control a capacitor bank in the VCO. The tuning
range, the RF frequency versus varactor voltage, is dependent on the VCO frequency setting, and is shown in
Figure 3. When the tuning voltage is in the range from 1 to 1.6V, the VCO gain is at its maximum, approximately 65-
70 MHz/V. It is then recommended that the varactor voltage is kept as much as possible in this range.
Figure 3
: RF frequency vs. varactor voltage and VCO frequency bit
The input capacitance at the varactor pin must be taken into considerations when designing the PLL loop filter. This
can be critical when designing a loop filter with high bandwidth, which gives relatively small component values. The
input capacitance is approximately 6 pF.
For test purposes, the VCO can be bypassed by applying a differential local oscillator (LO) signal to the device on
pin CPOUT and VARIN. A resistor of 18 k
to ground and a series capacitor of 47 pF are needed on both pins for
proper biasing. The register bit VCO_by must be set to ‘1’.
VCO gain
Vdd=3.3V, LDO_en=1, VCO_IB=0
800
820
840
860
880
900
920
940
960
980
1000
1020
1040
0
0.5
1
1.5
2
2.5
Vvaractor [V]
Freq [MHz]
VCO_freq=11
VCO_freq=10
VCO_freq=01
VCO_freq=00


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