Superior Attenuation Accuracy Digital Attenuators

Skyworks is pleased to introduce two digital attenuators with superior attenuation accuracy for base station, cellular-head end, repeater, test equipment and femtocell manufacturers. The 6 bit device has a 0.5 dB least significant bit (LSB) and the 7 bit device has a 0.25 dB LSB. These attenuators provide precise control over multi-standard radio transmitters and receivers, allow the user to configure the device for serial or parallel control, and do not utilize blocking capacitors so that low frequency operation is possible.

0.1 – 4.0 GHz Seven-Bit Digital Attenuator with Serial and Parallel Drivers

The SKY12343-364LF is a GaAs broadband seven-bit pHEMT digital attenuator with a 0.25 dB Least Significant Bit (LSB). A TTL/CMOS-compatible, dual mode serial or parallel programming interface (SPI) controller is integrated into the device.

The SKY12343-364LF attenuator features low insertion loss, excellent attenuation accuracy, a 31.75 dB attenuation range, and high linearity performance. The device is an ideal choice for a wide variety of 3G and 4G cellular infrastructure applications.

Attenuation is controlled by an SPI controller. Depending on the SPI sequence applied to the DATA_IN pin, the attenuation state between the RF1 and RF2 pins is programmed between a low insertion loss state or up to 31.75 dB. The V1 through V7 DC control pins determine the attenuation state if parallel mode is enabled.

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•0.1 – 4.0 GHz Seven-Bit Digital Attenuator with Serial and Parallel Drivers - Datasheet

3.0 GHz Six-Bit Digital Attenuator with Serial or Parallel Driver (0.5 dB LSB)

The SKY12347-362LF is a GaAs pHEMT six-bit broadband digital attenuator with a 0.5 dB Least Significant Bit (LSB). A Transistorto- Transistor Logic (TTL)/CMOS-compatible, dual-mode serial or parallel interface controller is integrated into the device.

The attenuator features low insertion loss, excellent attenuation accuracy, a 31.5 dB attenuation range, and high linearity performance. The SKY12347-362LF is an ideal choice for a wide variety of cellular 3G and 4G infrastructure applications.

Attenuation is controlled by a Serial Peripheral Interface (SPI). Depending on the SPI sequence applied to the SDI pin, the attenuation state between the RF1 and RF2 pins can vary between a low insertion loss state or up to 31.5 dB. The D0 through D5 DC control pins determine the attenuation state if parallel mode is enabled.

The device is provided in a 4 x 4 mm, 24-pin Quad Flat No-Lead (QFN) package.

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•DC-3.0 GHz Six-Bit Digital Attenuator with Serial or Parallel Driver (0.5 dB LSB) - Datasheet