STW81101AT STMicroelectronics, STW81101AT Datasheet - Page 44

• Manufacturer Part Number: STW81101AT
• Description: IC SYNTHESIZER MULTI RF 28VFQFPN
• Manufacturer: STMicroelectronics
• Type: Frequency Synthesizer (RF)r

Specifications of STW81101AT

• 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
• Number Of Elements: 1
• Pll Input Freq (min): 10MHz
• Pll Input Freq (max): 200MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: VFQFPN
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Industrial
• Pin Count: 28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
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A first solution to combine the differential outputs is the lumped LC type balun tuned in the
2 GHz band
Figure 32. LC lumped balun for divided by 2 output (MATCH_LC_LUMP_2G.dsn)
The same recommendation for the SMD components also applies to the divided by 2 output.
Another topology suited to combining the two outputs for the divided by 2 frequencies is
represented in
Figure 33. Evaluation board (EVB2G) matching network (MATCH_EVB2G.dsn)
RF
RF
OUTP
OUTN
RF
RF
50 ohm
50 ohm
OUTP
OUTN
50 ohm
50 ohm
(Figure
Figure
32).
33.
Vcc
Vcc
Vcc
Vcc
2.7nH
2.7nH
5.5nH
5.5nH
22pF
22pF
2pF
2pF
2:1
2.7nH
2pF
2.7nH
2pF
22pF
3pF
1.2pF
3nH
1.9nH
50 ohm
STW81101
50 ohm