SKY12322-86LF-EVB【PDF 1/8 页】BOARD EVALUATION FOR SKY12322-86

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DATA SHEET

SKY12322-86LF: 0.5-4.0 GHz Five-Bit Digital Attenuator

(0.5 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 4.0 GHz

? Positive voltage operation: 2.7 to 5.5 V

? Low current consumption: <100 μ A @ 3 V

? LSB attenuation: 0.5 dB

? Attenuation range: 15.5 dB

? High IIP3: +45 dBm

? Low insertion loss: 1 .2 dB @ 900 MHz

? Small, MSOP - 10 ( 10 - pin, 3 x 3 mm) package (MSL1, 260 ° C per

JEDEC J - STD - 020)

Description

The SKY12322 - 86LF is a monolithic, GaAs binary - weighted five -

bit single positive control voltage digital attenuator. The device

operates from 0.5 to 4.0 GHz. DC power consumption is very low,

typically 100 μ A maximum, with a control and supply voltage of

3 V.

Figure 1. SKY12322-86LF Block Diagram

The SKY12322 - 86LF is comprised of five cascaded fixed

attenuators, each of which has a shunt bypass switch. Beginning

at the 0.5 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 SKY12322 - 86LF has an LSB of 0.5 dB and total attenuation of

15.5 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

200218C ? Skyworks Proprietary Information ? Products and Prod uct Information are Subject to Change Without Notice ? March 4, 2011

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