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PDF SKY12332-310LF Data sheet ( Hoja de datos )
| Número de pieza | SKY12332-310LF | |
| Descripción | 6-Bit Digital Attenuator | |
| Fabricantes | Skyworks Solutions | |
| Logotipo |  |
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DATA SHEET
SKY12332-310LF: 6-Bit Digital Attenuator with Driver
LF–1 GHz, 0.5 dB LSB, 31.5 dB Range
Features
● Attenuation range: 31.5 dB
● LSB: 0.5 dB
● On-board low noise CMOS driver
● Excellent RF noise floor
● Single 5 V supply
● Very low DC power consumption
● Single positive control for each bit
● Small 5 x 5 mm QFN-32 package
● Available lead (Pb)-free and RoHS-compliant MSL-1 @ 260 °C
per JEDEC J-STD-020
Description
The Skyworks SKY12332-310LF is 6-bit digital GaAs attenuator
with an on-board low-noise CMOS driver. This attenuator offers
excellent performance from low frequency through 1 GHz, making
it ideal for IF and RF level control applications. It contains an on-
board CMOS driver circuit which accepts CMOS logic levels at the
6 control inputs and produces a negative supply voltage to control
the GaAs attenuator.
The SKY12332-310LF has excellent linearity for compatibility with
non-constant envelope signals, such as W-CDMA and OFDM. The
6 attenuation bits are binary weighted, with an LSB of 0.5 dB and
a total nominal attenuation range of 31.5 dB. It also has excellent
attenuation accuracy and is monotonic. The low-noise CMOS driver
enables a very low RF noise floor, typically -100 dBm.
Typical applications for this attenuator include level control in
cellular base stations, wireless data transceivers, broadband
systems, etc.
The required supply voltage for SKY12332-310LF is 5V. This part
can operate over the temperature range of -40 °C to 85 °C.
An evaluation board is available upon request.
NEW Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances)-compliant packaging.
Functional Block Diagram
VDD RF Input/Output
V1 0.5 dB
V2 1 dB
V3 2 dB
V4 4 dB
V5 8 dB
V6 16 dB
RF Input/Output
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200584 Rev. B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • January 10, 2007
1
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1 page  
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DATA SHEET • SKY12332-310LF
Circuit Description
The SKY12332-301LF is comprised of a Si CMOS die and a GaAs
digital attenuator die, packaged in a 5 x 5 mm, 32-pin QFN surface
mount package.
The CMOS die performs the following functions: it contains a
charge pump circuit that generates a negative voltage, VSS, from
the positive supply voltage, VDD; it decodes the 6-bit control word
applied to ports V1 through V6; and, it drives the corresponding
switching FETs on the GaAs attenuator die. This circuit was opti-
mized to produce the lowest possible noise in the RF signal path.
The GaAs attenuator die is comprised of 6 resistive, fixed
attenuator sections with nominal input and output impedance
of 50 Ω. The attenuation of these sections is binary weighted,
ranging from 0.5 dB nominal up to 16 dB nominal. These
attenuator sections are either switched into or out of the main
signal path, between ports J1 and J2, according to the 6-bit
control word applied to ports V1 through V6. This die is also
utilized in AA113-310.
The switching is performed by depletion mode MESFETs on the
attenuator die. The charge pump circuit on the CMOS die generates
the negative voltage VSS, nominally -3.75 V, required to enable
reverse bias of the gate-source of the MESFETs that must be
switched to high drain-source impedance to properly select or
bypass the fixed resistive attenuator sections.
Recommended Solder Reflow Profiles
Refer to the “Recommended Solder Reflow Profile”
Application Note.
Tape and Reel Information
Refer to the “Discrete Devices and IC Switch/Attenuators
Tape and Reel Package Orientation” Application Note.
Suggested Circuit
J1
C1
C2
VDD
C4 C3
J2
Component
C1, C3
C2
C4
Suggested Value
0.01 µF
0.025 µF
100 pF
QFN 5 x 5 (-310)
0.197 (5.00 mm) BSC
0.039 (1.00 mm) Max.
Pin 1
Indicator
32
0.187
(4.75 mm) BSC
0.001
(0.025 mm)
1
0.187
(4.75 mm)
BSC
0.197
(5.00 mm)
BSC
Seating
Plane
0.122 (3.10 mm)
± 0.006 (0.15 mm)
0.122 (3.10 mm)
± 0.006 (0.15 mm)
32
1
12˚ Max.
0.138
(3.50 mm) Ref.
0.019 (0.50 mm) BSC
0.138 (3.50 mm) Ref.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200584 Rev. B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • January 10, 2007
5
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5 Page | ||
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