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DATA SHEET
SKY12323-303LF: 0.5-3.0 GHz Five-Bit Digital Attenuator
(1 dB LSB)
Applications
? Transceiver transmit automatic level control or receive
automatic gain control in GSM, CDMA, WCDMA, WLAN,
Bluetooth ? , or Zigbee ? land mobile radio base stations or
terminal equipment
? General - purpose signal attenuation in telecommunications and
instrumentation applications
Features
? Broadband operation: 0. 5 to 3.0 GHz
? Attenuation range: 31 dB
? LSB attenuation: 1 dB
? Low insertion loss: 1.4 dB @ 900 MHz
? Positive voltage operation: 2.7 to 5.5 V
? Low current consumption: <100 μ A @ 3 V
? High IIP3: +45 dBm
? Small, MSOP - 10 ( 10 - pin, 3 x 3 mm) package with exposed
paddle (MSL1, 260 ° C per JEDEC J - STD - 020)
Description
The SKY12323 - 303LF is a monolithic, GaAs binary - weighted five -
bit single positive control voltage digital attenuator. The device
operates from 0.5 to 3.0 GHz. DC power consumption is very low,
typically 100 μ A maximum, with a control and supply voltage of
3 V.
Figure 1. SKY12323-303LF Block Diagram
The SKY12323 - 303LF is comprised of five cascaded fixed
attenuators, each of which has a shunt bypass switch. Beginning
at the 1 dB LSB, each succeeding fixed attenuator produces 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, which bypasses that
fixed attenuator stage; a logic low opens the switch to force the
input signal to that stage through the associated attenuator.
A functional block diagram is shown in Figure 1. The pin
configuration and package are shown in Figure 2. Signal pin
assignments and functional pin descriptions are provided in
Table 1.
The SKY12323 - 303LF has an 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. An external supply voltage of 2.7 to 5.5 V is
required.
Skyworks Solutions, Inc. ? Phone [781] 376 - 3000 ? Fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com
200273D ? Skyworks Proprietary Information ? Products and Prod uct Information are Subject to Change Without Notice ? June 3, 2011
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