SP4257 Datasheet, PDF (1/6 Pages) SIPAT Co,Ltd – 50 Ω SPDT Absorptive CMOS

Product Description
The SP4257 is a high-isolation CMOS 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 SP4257 provides
unprecedented isolation and integration.
The SP4257 is manufactured on SIPAT’s CMOS
process, a patented variation of silicon-on-insulator (SOI)
technology on a sapphire substrate, offering the performance
of GaAs with the economy and integration of conventional
CMOS.
Figure 1. Functional Diagram
RFC
RF1
50Ω
ESD
RF2
ESD
Product Specification
SP4257
50 Ω SPDT Absorptive CMOS
DC – 3.0 GHz RF Switch
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
Figure 2. Package Type
20-Lead 4x4 mm QFN
50Ω
CMOS
50Ω
Control
Driver
CTRL CTRL2
Table 1. Electrical Specifications @ +25 °C, V_DD = 3.0 V (Z_S = Z_L = 50 Ω)
Parameter
Condition
Minimum
Typical
Operating Frequency¹
DC
1000 MHz
0.75
Insertion Loss
2000 MHz
0.95
3000 MHz
1.2
Isolation Input to Output
1000 MHz
2000 MHz
3000 MHz
61
64
46
50
40
44
Isolation Output to Output
1000 MHz
2000 MHz
3000 MHz
57
63
54
60
42
48
Input IP2
5 MHz - 1000 MHz
80
Input IP3
5 MHz - 1000 MHz
50
55
Input 1dB Compression²
1000 MHz
29
31
Switching Time
50% CTRL to 10 / 90 RF
2
Video Feedthrough³
5 MHz - 1000 MHz
Notes: 1. Device linearity will begin to degrade below 5 MHz.
2. Note Absolute Maximum ratings in Table 3.
3. Measured with a 1 ns risetime, 0/3 V pulse and 500 MHz bandwidth
Maximum
3000
0.95
1.15
1.4
15
Tel: [phone] Fax: [phone] www.sipatsaw.com / [e-mail]
Units
MHz
dB
dB
dB
dBm
dBm
dBm
µs
mV_pp
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