RF2421PCBA [RFMD]
10dB SWITCHED ATTENUATOR; 10分贝切换的衰减器
| 型号： | RF2421PCBA |
| 厂家： | 
RF MICRO DEVICES |
| 描述： | 10dB SWITCHED ATTENUATOR |
| 文件： | 总4页 (文件大小：43K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RF2421
10dB SWITCHED ATTENUATOR
9
Typical Applications
• Power Control in Communication Systems • Commercial and Consumer Systems
• CMOS Compatible Programmable
Attenuator
• Portable Battery-Powered Equipment
Product Description
-A-
0.008
0.004
The RF2421 is a monolithic switched attenuator. The
device is built using a Gallium Arsenide process technol-
ogy and has a single step attenuation of 10dB. The input
and output of the device has a low VSWR 50Ω match.
The RF output can drive up to +16dBm. This unit is
intended for use in systems that require RF power control
by digital means. No negative supply voltages are
required, and the current consumption is less than 5µA
when the attenuator is off.
0.018
0.014
0.196
0.189
0.050
Dimensions in mm
0.068
0.053
0.157
0.150
0.244
0.229
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding
mold flash.
3. Lead coplanarity -
0.005 with respect to datum "A".
8° MAX
0° MIN
0.009
0.007
0.034
0.016
9
Optimum Technology Matching® Applied
Package Style: SOIC-8
Si BJT
GaAs HBT
GaAs MESFET
!
Si Bi-CMOS
SiGe HBT
Si CMOS
Features
• Single 2.7V to 6V Supply
• 10dB Single Step Attenuation
• 1 dB Insertion Loss
• 1-bit Digitally Controlled Attenuation
• Digitally Controlled Power Down Mode
• 500MHz to 3000 MHz Operation
NC 1
8 NC
RF IN 2
GND 3
7 G10
6 VDD
5 NC
Ordering Information
RF OUT 4
RF2421
10dB Switched Attenuator
RF2421 PCBA
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Functional Block Diagram
Rev A6 001102
9-15
RF2421
Absolute Maximum Ratings
Parameter
Rating
Unit
Supply Voltage
-0.5 to +6.0
V
DC
Caution! ESD sensitive device.
Control Voltage
Input RF Power
Operating Ambient Temperature
Storage Temperature
-0.5 to +6.0
+20
-40 to +85
-40 to +150
V
dBm
°C
RF Micro Devices believes the furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).
°C
Specification
Typ.
Parameter
Unit
Condition
Min.
Max.
T=25 °C, V =5.0V, Freq=915MHz
Overall
DD
Frequency Range
Insertion Loss
500 to 3000
1.0
MHz
dB
1.5
V
V
=0V
DC
G10
Insertion Loss
9.5
10
10.5
dB
dB
=V
DD
G10
Gain Flatness
0.25
In any 50MHz band
Input
Input Impedance
Input VSWR
Input 1dB Compression
Attenuation Control
Attenuation “ON” Voltage
50
Ω
dBm
V
1.3:1
+17
2.5
V
Voltage supplied to input
Voltage supplied to input
DD
Attenuation “OFF” Voltage
Current
0.3
0.5
V
mA
0.4
Into control line, V
=5V
G10 DC
Response Time
<10
ns
Output
9
IM
-60
-40
dBc
dBc
Ω
With 0dBm output in each of 2 tones, attenu-
ation “OFF”.
With 0dBm output in each of 2 tones, attenu-
ation “OFF”.
3
Harmonic Output
Output Impedance
Output VSWR
Power Supply
Voltage
50
1.3:1
5
5
V
V
mA
µA
Specifications
2.7
6.0
0.5
5
Operating Limits
Attenuation “ON”
Attenuation “OFF”
Current
9-16
Rev A6 001102
RF2421
Pin
1
Function Description
Interface Schematic
Not internally connected. This pin can be grounded.
NC
RF Input. This pin is not DC blocked, and an external blocking capacitor
is recommended. The value depends on the frequency used.
2
RF IN
RF IN
RF OUT
Ground connection. Keep trace physically short and connect immedi-
ately to the ground plane for best performance.
3
4
GND
RF Output. This pin is not DC blocked, and an external blocking capac- See pin 2.
itor is recommended. The value depends on the frequency used.
RF OUT
Not internally connected. This pin can be grounded.
5
6
7
NC
VDD
G10
Power supply pin. An external RF bypass capacitor is recommended.
Control pin for the 10dB attenuator. This pin has an internal pull-down
resistor, so when the pin is not connected the attenuator will be turned
G10
off.
Not internally connected. This pin can be grounded.
8
NC
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
9
P1
P1-1
P1-3
1
2
3
VDD
GND
ATTN
2421400 Rev A
1
2
3
4
8
7
6
5
C3
100 pF
50 Ω µstrip
50 Ω µstrip
RF IN
J1
P1-3
P1-1
C4
100 pF
C1
100 pF
C2
100 nF
RF OUT
J2
Rev A6 001102
9-17
RF2421
Evaluation Board Layout
Board Thickness 0.031”; Board Material FR-4
9
9-18
Rev A6 001102
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