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©2005 Peregrine Semiconductor Corp. All rights reserved. Document No. 70-0166-02 │ www.psemi.com
4x4mm 20 Lead QFN
RFC
RF1 RF2
CTRL1 CTRL2
CMOS
Control
Driver
The PE4257 is a high-isolation UltraCMOS™ Switch designed
for wireless applications, covering a broad frequency range
from near DC up to 3000 MHz. This single-supply SPDT
switch integrates a two-pin CMOS control interface. It also
provides low insertion loss with extremely low bias
requirements while operating on a single 3-volt supply. In a
typical wireless application, the PE4257 provides
unprecedented isolation and integration.

The PE4257 is manufactured in Peregrine’s patented Ultra
Thin Silicon (UTSi®) CMOS process, offering the performance
of GaAs with the economy and integration of conventional
CMOS.
Product Specification
50 Ω SPDT Absorptive UltraCMOS™
DC – 3.0 GHz RF Switch
Product Description
Figure 1. Functional Diagram
PE4257
Features
• 50 Ω characteristic impedance
• Integrated 50 Ω 0.25 watt terminations
• High input IP3 > +55 dBm
• High isolation 64 dB at 1000 MHz
• Low insertion loss: typically 0.75 dB
at 1000 MHz and 0.95 dB at 2000 MHz
• LV CMOS two-pin control
• Single +3 volt supply operation
• Low current consumption: 8 µA
Parameter Condition Minimum Typical Maximum Units
Operating Frequency
1
DC 3000 MHz
Insertion Loss
1000 MHz
2000 MHz
3000 MHz

0.75
0.95
1.2
0.95
1.15
1.4
dB
Isolation Input to Output
1000 MHz
2000 MHz
3000 MHz
61
46
40
64
50
44
dB
Isolation Output to Output
1000 MHz
2000 MHz
3000 MHz
57
54
42
63
60
48
dB
Input IP2 5 MHz - 1000 MHz 80 dBm
Input IP3 5 MHz - 1000 MHz 50 55 dBm
Input 1dB Compression
2
1000 MHz 29 31 dBm
Switching Time 50% CTRL to 10 / 90 RF 2 µs
Video Feedthrough
3
5 MHz - 1000 MHz 15 mV
pp

Notes: 1. Device linearity will begin to degrade below 1 MHz.
2. Note Absolute Maximum ratings in Table 3.
3. Measured with a 1 ns risetime, 0/3 V pulse and 500 MHz bandwidth
Figure 2. Package Type
Table 1. Electrical Specifications @ +25 °C, V
DD
= 3.0 V (Z
S
= Z
L
= 50 Ω)