SKY12329-350LF Datasheet, PDF (1/7 Pages) Skyworks Solutions Inc. – SKY12329-350LF GaAs Digital Attenuator 5-Bit, 1 dB LSB 400 MHz–4 GHz

data sheet
SKY12329-350LF: GaAs Digital Attenuator
5-Bit, 1 dB LSB 400 MHz–4 GHz
Applications
l _{T ransceiver transmit automatic level control or receive auto-}
matic gain control in WiMAX, GSM, CDMA, WCDMA, WLAN,
Bluetooth^®, Zigbee^®, Land Mobile Radio Base stations or
Terminal Equipment
l _{G eneral purpose signal attenuation in telecommunications and}
instrumentation applications
Features
l _{B roadband: 400 MHz–4 GHz}
l _{A ttenuation range: 31 dB}
l _{L east significant bit attenuation: 1 dB}
l _{L ow insertion loss: 1.2 dB @ 900 MHz}
l _{S ingle positive control voltage: 2.7–5.5 V}
l _{L ow current consumption: <100 µA @ 5 V}
l _{S mall QFN-16 3 x 3 mm package with exposed paddle}
^l L ead (Pb)-free and RoHS-compliant MSL-1 @ 260 °C
per JEDEC J-STD-020
Description
The SKY12329-350LF is a monolithic GaAs, binary-weighted,
5-bit, single positive control voltage digital attenuator which
operates from 400 MHz–4 GHz. The attenuator has a least
significant bit (LSB) of 1 dB and total attenuation of 31 dB. The
two RF ports are bilateral; each can be used as the RF input or
the RF output. This attenuator requires an external supply
voltage of 2.7–5.5 V.
The SKY12329-350LF is comprised of 5 fixed attenuators in
cascade, each of which having a shunt bypass switch. Beginning
at the LSB, which is 1 dB, each succeeding fixed attenuator pro-
duces twice the attenuation of the preceding stage. The state of
each bypass switch is controlled by the logic level voltage applied
to the associated control voltage input; a logic high voltage closes
the associated switch, thereby
Functional Block Diagram
RF
Input/Output
V₁
1 dB
V₂
2 dB
V₃
4 dB
V₄
8 dB
V₅
16 dB
RF
Input/Output
bypassing that fixed attenuator stage, and a logic low opens the
switch to force the input signal to that stage through the associ-
ated attenuator.
DC power consumption is very low, 100 µA maximum with con-
trol voltage and supply voltage of 5 V. The switch 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200709 Rev. F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2009
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