STW81100AT-1 STMicroelectronics, STW81100AT-1 Datasheet - Page 24

• Manufacturer Part Number: STW81100AT-1
• Description: IC SYNTHESIZER MULTI RF 28VFQFPN
• Manufacturer: STMicroelectronics
• Type: Frequency Synthesizerr

Specifications of STW81100AT-1

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 3:2
• Differential - Input:output: No/No
• Frequency - Max: 4.4GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-VFQFN, 28-VFQFPN
• Frequency-max: 4.4GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STW81100
The same recommendation for the SMD components applies also for the divided by 2 output.
Another topology suitable to combine the two outputs for the divided by 2 frequencies is represented in
Figure 28
Figure 28. Lumped output matching for the divided by 2 output
The balun used is the 50 to 100Ω - 1.65GHz to 2.2GHz Johanson balun (1850BL15B100).
9.3 Divided by 4 output
The same topology, components values and considerations of
output.
As for the previous sections, a solution to combine the differential outputs is the lumped LC type balun
tuned in the 1GHz band (
over the whole band (825GHz to 1.1GHz).
Figure 29. LC lumped balun for the divided by 4 output
24/29
.
RF
RF
O U T N
O U T P
RF
RF
25 O hm
25 O hm
O U T P
O U T N
Figure 29
50 O hm
50 O hm
V
V
C C
C C
5.5nH
5.5nH
V
V
). An output power of approximately 5 dBm is delivered to a 50Ω load
C C
C C
22nH
22nH
10pF
10pF
4pF
4pF
2:1
5.5nH
4pF
5.5nH
4pF
Figure 26
6pF
10pF
14nH
, apply also for the divided by 4
50 O hm
50 O hm