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參數資料
| 型號： | 4257-52 |
| 廠商： | PEREGRINE SEMICONDUCTOR CORP |
| 元件分類： | 開關 |
| 英文描述： | 50 ?SPDT Absorptive UltraCMOS?DC ?3.0 GHz RF Switch |
| 中文描述： | 0 MHz - 3000 MHz RF/MICROWAVE SGL POLE DOUBLE THROW SWITCH, 1.4 dB INSERTION LOSS |
| 封裝： | 4 X 4 MM, GREEN, QFN-20 |
| 文件頁數： | 4/7頁 |
| 文件大?。?/td> | 298K |
| 代理商： | 4257-52 |
Product Specification
PE4257
Page 4 of 7
Document No. 70-0166-06
│ UltraCMOS RFIC Solutions
2004-2009 Peregrine Semiconductor Corp. All rights reserved.
Evaluation Kit
The SPDT Switch Evaluation Kit board was designed to
ease customer evaluation of the PE4257 SPDT switch.
The RF common port is connected through a 50
transmission line to J2. Port 1 and Port 2 are
connected through 50
transmission lines to J1 and
J3. A through transmission line connects SMA
connectors J4 and J5. This transmission line can be
used to estimate the loss of the PCB over the
environmental conditions being evaluated.
The board is constructed of a four metal layer FR4
material with a total thickness of 0.031”. The
transmission lines were designed using a coplanar
waveguide with ground plane (28 mil core, 47.6 mil
width, 30mil gap).
Note the number of vias surrounding the device in the
layout shown in Figure 8. These vias are critical for
obtaining the specified isolation performance for the
device shown in this datasheet.
J6 provides a means for controlling DC and digital
inputs to the device. The provided jumpers short the
package pin to ground for logic low. When the jumper
is removed, the pin is pulled up to VDD for logic high.
When the jumper is in place, 3 A of current will flow
through the 1 M
pull up resistor. This extra current
should not be attributed to the requirements of the
device.
Figure 8. Evaluation Board Layouts
Figure 9. Evaluation Board Schematic
Peregrine Specification 101/0151
Peregrine Specification 102/0198
50 OHM T-Line
1
2
J5
R1
1M
R1
1M
1
3
5
7
2
4
6
8
10
12
14
13
9
11
J6
HEADER 7X2
J6
HEADER 7X2
R2
1M
R2
1M
1
2
J4
1
2
J3
GN
D
7
GND
2
RF1
3
GND
4
GND
5
GN
D
6
GND
1
RF
C
8
GN
D
9
GN
D
10
GND
12
GND
11
RF2
13
GND
14
GND
15
C2
16
C1
17
VSS/G
N
D
18
GND
19
VDD
20
U1
PE4255/PE4257/PE42551
U1
PE4255/PE4257/PE42551
C3
DNI
C3
DNI
C2
DNI
C2
DNI
C1
DNI
C1
DNI
1
2
J2
1
2
J1
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