SKY77768 Datasheet, PDF (1/2 Pages) Skyworks Solutions Inc. – Low voltage positive bias supply 3.2 V to 4.2 V

PRODUCT SUMMARY
SKY77768 SkyHi™ Power Amplifier Module for WCDMA /
HSDPA / HSUPA / HSPA+ / LTE – Band VIII (880–915 MHz)
Applications
• WCDMA handsets
• HSDPA
• HSUPA
• HSPA+
• LTE
Features
• Low voltage positive bias
supply 3.2 V to 4.2 V
• Good linearity
• High efficiency
- 50% at 28.5 dBm
• Large dynamic range
• Small, low profile package
- 3 mm x 3 mm x 0.9 mm
- 10-pad configuration
• Power down control
• InGaP
• Supports low collector
voltage operation
• Digital Enable
• No VREF required
• CMOS compatible control
signals
• Integrated Directional
Coupler
Description
The SKY77768 SkyHi™ Power Amplifier Module (PAM) is a fully matched 10-pad surface mount
module developed for Wideband Code Division Multiple Access (WCDMA) applications. This small and
efficient module packs full 880-915 MHz bandwidth coverage into a single compact package.
Because of high efficiencies attained throughout the entire power range, the SKY77768 delivers
unsurpassed talk-time advantages. The SKY77768 meets the stringent spectral linearity requirements
of High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), and Long
Term Evolution (LTE) data transmission with high power added efficiency. An integrated directional
coupler eliminates the need for any external coupler.
The Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains all amplifier
active circuitry, including input and interstage matching circuits. The silicon CMOS support die,
providing precision biasing for the MMIC affords a true CMOS-compatible control interface. Output
match into a 50-ohm load, realized off-chip within the module package, optimizes efficiency and
power performance.
The SKY77768 is manufactured with Skyworks' InGaP GaAs Heterojunction Bipolar Transistor (HBT)
process which provides for all positive voltage DC supply operation and maintains high efficiency and
good linearity. While primary bias to the SKY77768 can be supplied directly from any suitable battery
with an output of 3.2 V to 4.2 V, optimal performance is obtained with VCC2 sourced from a DC-DC
power supply adjusted within 0.5 V to 3.4 V based on target output power levels. Power down
executes by setting VENABLE to zero volts. No external supply side switch is needed as typical "off"
leakage is a few microamperes with full primary voltage supplied from the battery.
Figure 1. SKY77768 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201777B • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • August 30, 2013
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