STW81102ATR STMicroelectronics, STW81102ATR Datasheet - Page 41

• Manufacturer Part Number: STW81102ATR
• Description: IC SYNTHESIZER MULTI RF 28VFQFPN
• Manufacturer: STMicroelectronics
• Type: Frequency Synthesizerr

Specifications of STW81102ATR

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 3:2
• Differential - Input:output: No/No
• Frequency - Max: 4.65GHz
• 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: 4.65GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STW81102
8
8.1
Application information
The STW81102 features three different alternately selectable bands: direct output (3.0 to
3.62 GHz and 4.0 to 4.65 GHz), divided by 2 (1.5 to 1.81 GHz and 2.0 to 2.325 GHz) and
divided by 4 (750 to 905 MHz and 1000 to 1162.5 MHz). To achieve a suitable power level, a
good matching network is necessary to adapt the output stage to a 50 Ω load. Moreover,
since most commercial RF components have single-ended input and output terminations, a
differential to single-ended conversion may be required.
The different matching configurations shown below for each of the three bands are
suggested as a guideline when designing your own application board.
Inside the evaluation kit is the ADS design for each matching configuration suggested in this
chapter. The name of the corresponding ADS design is given in each figure.
The ADS designs provide only a first indication of the output stage matching, and should be
reworked according to the choices of layout, board substrate, components and so on.
The ADS designs of the evaluation boards are provided with a complete electromagnetic
modelling (board, components, and so on).
Direct output
If you do not need a differential to single conversion, you can match the output buffer of the
STW81102 in the simple way shown in
ended output network in the 3.0 - 4.65GHz range (MATCH_LC_LUMP_4G_DIFF.dsn).
Figure 28. Differential/single-ended output network
Since most discrete components for microwave applications are single-ended, you can
easily use one of the two outputs and terminate the other one to 50 Ω with a 3 dB power
loss.
(MATCH_LC_LUMP_4G_DIFF.dsn)
RF
RF
OUTP
OUTN
100 ohm
100 ohm
Vcc
Vcc
Figure 28
5.5nH
5.5nH
. This illustrates the differential to single-
10pF
10pF
50 ohm
50 ohm
Application information
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