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PDF ALM-38140 Data sheet ( Hoja de datos )
| Número de pieza | ALM-38140 | |
| Descripción | 50MHz - 4GHz PIN Diode Variable Attenuator Module | |
| Fabricantes | AVAGO TECHNOLOGIES LIMITED | |
| Logotipo |  |
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ALM-38140
50MHz – 4GHz PIN Diode Variable Attenuator Module
Data Sheet
www.DataSheet4U.com
Description
Avago Technologies’ ALM-38140 is a fully matched
wideband variable attenuator module with high linearity
performance and high dynamic range. The high dynamic
range and low phase shift can be achieved with only one
external inductor place between Linput and Loutput.
ALM-38140 is a fully integrated solution using Avago
Technologies’ low distortion silicon PIN diodes housed in
a miniature 3.8 x 3.8 x 1.0 mm3 MCOB (Multiple-Chips-On-
Board) package.
This variable attenuator module is easily operated with
a constant voltage, Vsupply = 2.7V and a control voltage,
Vcontrol = 1 – 5V. No external biasing components
needed.
ALM-38140 is ideal for gain control in RF amplifier
circuits.
Package Marking
38140
WWYY
XXXX
RF 2 GND RF 1
Features
• Fully integrated module
• High dynamic range
• Excellent Input IP3 performance
• High Input P1dB compression
• Low phase shift performance
• Tape-and-Reel packaging option available
Specifications
Typical Performance at 1.9GHz
• Attenuation : 39dB
• Insertion Loss : 3.2dB
• Input IP3 : 50dBm
• Input P1dB : > 30dBm
Applications
• Broadband system applications; such as CATV, WCDMA,
VSAT, WIMAX, Cellular base station.
• General purpose voltage controlled attenuator for low
current applications.
• Temperature compensation circuitry
• Automatic Gain Control
Vsupply
Top View
Bottom View
Note:
Package marking provides orientation and identification
“38140” = Device Part Number
“WWYY” = Work week and year of manufacture
“XXXX” = Last 4 digit of assembly lot number
* RF1 and RF2 can be used either as RF input or RF output as they are
symmetrical.
Attention: Observe precautions for
handling electrostatic sensitive devices.
ESD Machine Model = 300 V
ESD Human Body Model = 900 V
Refer to Avago Application Note A004R:
Electrostatic Discharge, Damage and Control.
1 page  
ALM-38140 Typical Broadband Performance at 25°C
(Vsupply = 2.7V, Vctrl = 1V - 5V)
www.DataSheet4U.com
0.00
-10.00
-20.00
-30.00
-40.00
-50.00
0
1000 2000 3000
Frequency (MHz)
Figure 1. S21 Vs Frequency as function of Vctrl
Vctrl=5.0V
Vctrl=4.0V
Vctrl=3.0V
Vctrl=2.0V
Vctrl=1.5V
Vctrl=1.2V
Vctrl=1.0V
4000
ALM-38140 Typical Over-Temperature Broadband Performance
(Vsupply = 2.7V, Vctrl = 1V & 5V)
0
25°C
-10
85°C
-40°C
-20
-30
-40
0 1000 2000 3000 4000
Frequency (MHz)
0
-10
-20
25°C
-30 85°C
-40°C
-40
0 1000 2000 3000 4000
Frequency (MHz)
Figure 2. S11 (Return Loss) at Vctrl =1V vs Frequency vs Temperature
Figure 3. S11 (Return Loss) at Vctrl =5V vs Frequency vs Temperature
0
-10
-20
-30
25°C
85°C
-40°C
-40
0 1000 2000 3000 4000
Frequency (MHz)
Figure 4. S22 (Return Loss) at Vctrl=1V vs Frequency vs Temperature
0
-10
-20
-30
25°C
85°C
-40°C
-40
0 1000 2000 3000 4000
Frequency (MHz)
Figure 5. S22 (Return Loss) at Vctrl=5V vs Frequency vs Temperature
5 Page 
Demo board Layout
0.7000
1.1552
0.6000
1.1552
0.4000 0.4000
www.DataSheet4U.com
* Dimensions in mm
123 4
DC Pin Configuration
Pin 1 – Vsupply
Pin 2, 3 – GND
Pin 4 – Vcontrol
Figure 33. Demo board Layout
1. PCB material used is 10 mils Rogers RO4350, with FR4 backing for mechanical strength.
2. The phase compensation coil values given in Table 1 are based on the trace layout on demo board shown in Figure 33. Trace layout different from
that specified in Figure 33, will require different values for the phase compensation coil.
3. Pad layout for phase compensation coil shown in Figure 33 is based on 0402 size.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ALM-38140.PDF ] | |
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