SKY77912_21 Datasheet, PDF (1/2 Pages) Skyworks Solutions Inc. – Supports APT, buck DC-DC supply

PRODUCT SUMMARY
SKY77912-21 Tx-Rx Front-End Module for Quad-Band GSM /
GPRS / EDGE w/ 10 Linear TRx Switch Ports, Dual-Band
TD-SCDMA, and TDD LTE Band 39
Applications
• Cellular handsets encompassing Quad-Band GSM/EDGE,
Dual-Band TD-SCDMA, and TDD LTE
- Class 4 GSM850/900
- Class 1 DCS1800/PCS1900
- Class 12 GPRS multi-slot operation
- Linear EDGE operation
- TD-SCDMA Bands 34/39
- TDD LTE Band 39
Features
• Small, low profile package
- 5.5 mm x 5.3 mm x 0.8 mm Max
- 38-pad configuration
• MIPI^® RFFE control with dual-standard support
- User-selectable register mappings
- Linear or VRAMP-based GMSK power control
• RF ports internally matched to 50 Ω load
• High Efficiency (inclusive of coupler)
• Tx harmonics below –40 dBm
• Supports APT, buck DC-DC supply
• Ten low insertion loss/high linearity TRx switch ports
• RF input switching to 3G/4G path
• Integrated broadband directional coupler
• Integrated noise suppression notch filter for WiFi
coexistence
• Built-in IEC-compliant antenna ESD protection
• High impedance control inputs: 20 µA, maximum
• Current limiting and over-voltage protection for
ruggedness and extended battery life
• Power control circuitry built-in for improved TRP variation
Description
SKY77912-21, a Tx / Rx Front-End Module (FEM), offers the complete
transmit VCO-to-Antenna and Antenna-to-receive SAW filter solution for
advanced cellular handsets comprising quad-band GSM, GPRS, EDGE
multi-slot operation, and TD-SCDMA and TDD LTE transmission. The
FEM fully enables broadband 3G/4G RF switch-through, outward
switching of the Power Amplifier (PA) RF inputs, ten transmit / receive
(TRx) antenna switch ports, and an integrated directional coupler.
A new multi-standard CMOS controller provides PA band/mode
selection and bias control, including the Mobile Industry Processor
Interface (MIPI^®) RFFE logic, and switch decoder circuitry. The controller
supports user-optional control of linear RF or analog VRAMP of the
GMSK envelope. A distinct MIPI register mapping included in this Data
Sheet provides for each of these control paradigms, including
associated approaches to PA and switch control.
The Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated in
Gallium Arsenide (GaAs). The low band (LB) PA transmits in the
GSM850/900 bands. The high band (HB) PA supports DCS, PCS, TD-
SCDMA bands 34/39, and TDD LTE band 39. The HBT, switch, and
controller die, and passive components mount onto a multi-layer
laminate substrate and the entire assembly encapsulated with plastic
over-mold.
Built into the SKY77912-21 is a complete features set for state-of-the-
art performance and minimal phone board complexity, including PA
over-voltage and over-current protection, 50 ohms matching and zero
DC offset on all RF pins, TRx high linearity/low loss switching and high
off-state isolation, integrated directional coupler, IEC ruggedness at
antenna output, LB and HB input switching for alternate RF routing
3G/4G Tx paths, power supply pads shared between LB and HB, and
ultra-low leakage currents for long standby times.
Selecting the linear-GMSK operation standard disables VRAMP input so
all PA biasing depends only on MIPI mode selection. The transmitted
envelope is a linear function of RF input.
Selecting VRAMP-enabled operation, the PA controller provides VRAMP
control of the GMSK envelope and reduces sensitivity to input drive,
temperature, power supply, and process variations. Skyworks’ Finger-
Based Integrated Power Amplifier Control (FB-iPAC) minimizes output
power variation into mismatch. In EDGE and TD-SCDMA / TDD LTE
linear modes, VRAMP voltage and MIPI-based bias settings jointly
optimize PA linearity and efficiency.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
203476A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 3, 2015
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