TRF1121
TRF1221
SLWS170B – APRIL 2005 – REVISED JANUARY 2008
www.ti.com
VCO Tuning Characteristics
The TRF1121 and TRF1221 have internal VCOs with the following frequency vs tuning voltage characteristics.
2500
2250
700
600
2000
1750
1500
1250
1000
?40 oC
+25 oC
+85 oC
Frequency
Mod Sense
500
400
300
200
100
1
1.5
2
2.5 3 3.5
4
4.5
5
Tuning Voltage (V)
Figure 9. TRF1121 LO2A Frequency LO2ATUN Voltage
2750
2500
?40 oC
+25 oC
+85 oC
700
600
2250
2000
1750
1500
1250
Frequency
Mod Sense
500
400
300
200
100
1
1.5
2
2.5
3
3.5
4
4.5
5
Tuning Voltage (V)
Figure 10. TRF1121 LO2B Frequency vs LO2BTUN Voltage
14
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Copyright ? 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): TRF1121 TRF1221
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