RF2420PCBA [RFMD]
PROGRAMMABLE ATTENUATOR; 可编程衰减器
| 型号： | RF2420PCBA |
| 厂家： | 
RF MICRO DEVICES |
| 描述： | PROGRAMMABLE ATTENUATOR |
| 文件： | 总6页 (文件大小：64K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RF2420
PROGRAMMABLE ATTENUATOR
9
Typical Applications
• Power Control in Communication Systems • Commercial and Consumer Systems
• CMOS Compatible Programmable
Attenuators
• Portable Battery-Powered Equipment
Product Description
-A-
0.157
0.150
0.008
0.004
The RF2420 is a multistage monolithic programmable
attenuator. The device is built using an advanced Gallium
Arsenide process technology and has an attenuation pro-
grammability over a 44dB range in 2dB steps. The atten-
uation is set by five bits of digital data. The input and
output of the device have a low VSWR 50Ω match. This
unit is intended for use in systems that require RF trans-
mit power control by digital means. Typical applications
are in dual mode IS-54/55 compatible cellular transceiv-
ers and TETRA systems. No negative supply voltages
are required.
0.018
0.014
0.393
0.386
0.050
0.068
0.053
0.244
0.229
8° MAX
0° MIN
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding
mold flash.
3. Lead coplanarity - 0.005 with
respect to datum "A".
9
0.009
0.007
0.034
0.016
Optimum Technology Matching® Applied
Package Style: SOIC-16
Si BJT
GaAs HBT
üGaAs MESFET
Si CMOS
Si Bi-CMOS
SiGe HBT
Features
• Single 3V to 6V Supply
RF IN
1
16 G2
• 0dB to 44dB Attenuation Range
• 4dB Insertion Loss
2 dB
4 dB
8 dB
VDD 2
VDD 3
VDD 4
VDD 5
VDD 6
VDD 7
VDD 8
15 G4
• 5-bit Digitally Controlled Attenuation
• Digitally Controlled Power Down Mode
• DC to 950MHz Frequency Range
14 G8
13 GND
12 GND
11 G10
10 G20
10 dB
20 dB
Ordering Information
RF2420
Programmable Attenuator
RF2420 PCBA
Fully Assembled Evaluation Board
9
RF OUT
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Functional Block Diagram
Rev A6 010720
9-9
RF2420
Absolute Maximum Ratings
Parameter
Supply Voltage
Rating
-0.5 to +7.0
Unit
Caution! ESD sensitive device.
V
DC
RF Input Power
Operating Ambient Temperature
Storage Temperature
+17
-40 to +85
-40 to +150
dBm
°C
°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).
Specification
Typ.
Parameter
Unit
Condition
Min.
Max.
T=25°C and 5V at 420MHz
Overall
Frequency Range
DC to 950
MHz
Tuning of bypass capacitors is required for
shifting the center frequency. See the evalu-
ation board schematic for details.
Insertion Loss
Attenuation Range
Gain Flatness
4
6
3
dB
dB
dB
MHz
MHz
0 to 44
In any 50MHz band, at max attenuation
At 26dB attenuation
At maximum attenuation
3dB Bandwidth
500
50
Input
Input Impedance
50
Ω
Input VSWR
1.2:1
+15
1.5:1
Input 1dB Compression
Attenuation
Attenuation Settings
Accuracy
+13
2.5
dBm
2, 4, 8, 10, 20
dB
dB
dB
CMOS Level, 5 bits
2dB step
4dB through 20dB steps
±0.5
±1.0
9
Attenuation Control
Attenuation “ON” Voltage
V
V
Voltage Supplied to input
DD
Attenuation “OFF” Voltage
Current
Response Time
0.3
1.0
V
mA
ns
Voltage Supplied to input
Into each control line
0.4
<10
Output
IM3
-30
-40
dBc
dBc
Ω
With 0dBm output in each of 2 tones
Harmonic Output
Output Impedance
Output VSWR
Power Supply
Voltage
50
1.2:1
1.5:1
5
3 to 6
4
V
V
mA
mA
Specifications
Operating Limits
Operating
Current
8
0.75
0.4
Power Down
9-10
Rev A6 010720
RF2420
Pin
1
Function Description
Interface Schematic
RF Input. This pin is not DC-blocked, and an external blocking capaci-
RF IN
tor is required. The value depends on the frequency used. The DC
value on this pin is approximately equal to VDD.
RF IN
VDD supply connection. Bypassing is critical: To achieve maximum
attenuation range the magnitude of the impedance at the operation fre-
quency, as seen from the package pins, needs to be less than 0.5Ω.
The DC source to the pin may be a logic driver gate to implement a
Power Down function.
2
VDD
Same as pin 2.
3
4
5
6
7
8
9
VDD
VDD
VDD
VDD
VDD
Same as pin 2.
Same as pin 2.
Same as pin 2.
Same as pin 2.
Same as pin 2.
VDD
RF OUT
RF Output. Same as pin 1. Pin 1 and 9 are interchangeable.
RF OUT
Control pin for the 20dB attenuator. This pin has an internal pull-down
resistor, so when the pin is not connected the attenuator will be turned
off.
10
11
G20
G10
9
Gxx
Control pin for the 10dB attenuator. This pin has an internal pull-down Same as pin 10.
resistor, so when the pin is not connected the attenuator will be turned
off.
Ground.
Ground.
12
13
14
GND
GND
G8
Control pin for the 8dB attenuator. This pin has an internal pull-down
resistor, so when the pin is not connected the attenuator will be turned
off.
Same as pin 10.
Same as pin 10.
Same as pin 10.
Control pin for the 4dB attenuator. This pin has an internal pull-down
resistor, so when the pin is not connected the attenuator will be turned
off.
15
16
G4
G2
Control pin for the 2dB attenuator. This pin has an internal pull-down
resistor, so when the pin is not connected the attenuator will be turned
off.
Rev A6 010720
9-11
RF2420
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P2
1
P1
1
2
3
P2-1
P2-2
P2-3
P2-4
P2-5
NC
G2
NC
2
3
G4
GND
VDD
G8
P1-3
4
G10
G20
P2-1
P2-2
5
C9
100 pF
C1
100 pF
6
RF IN
J1
SMA
50 Ω µstrip
NC
7
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
2 dB
4 dB
NC
8
C8
100 pF
GND
9
NC
10
P2-3
P2-4
P2-5
C7
100 pF
C2
120 pF
8 dB
Note:
Series resonant at F0; place C2
midway between pin 2 and pin 8
C6
100 pF
10 dB
20 dB
9
P1-3
C5
100 pF
C3
10 µF
RF OUT
2420400B
J2
SMA
50 Ω µstrip
C4
100 pF
9-12
Rev A6 010720
RF2420
Evaluation Board Layout
Board Size 2.020” x 2.020”
Board Thickness 0.031”, Board Material FR-4
9
Rev A6 010720
9-13
RF2420
9
9-14
Rev A6 010720
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