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PDF SKY77528 Data sheet ( Hoja de datos )
| Número de pieza | SKY77528 | |
| Descripción | Front-End Module | |
| Fabricantes | Skyworks Solutions | |
| Logotipo |  |
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PRODUCT SUMMARY
SKY77528 Tx Front-End Module for Quad-Band GSM / EDGE
www.dAaptapshleiceta4tui.oconms
• Quad-band, cellular
handsets:
- Class 4 GSM850/
GSM900
- Class 1 DCS1800/
PCS1900
- Class E2 GSM850/
EGSM900
- Class E2 DCS1800/
PCS1900
- Class 12 EGPRS multi-slot
operation
Features
• High efficiency:
- GSM850, 45% (peak)
- EGSM900, 45% (peak)
- DCS1800, 40% (peak)
- PCS1900, 40% (peak)
• Low-loss PHEMT RF
antenna switch
• Detector output: linear dB/V
• Closed loop GMSK mode
power control
• Low VRAMP current
• Low VBATT detection
• Integrated temperature
sensor
• Small Package
- 8 mm x 6 mm
• Low Profile
- 1.1 mm Max.
Description
The SKY77528 is a transmit Front-End Module (FEM) designed for quad-band Global System for
Mobile Communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rate for
GSM Evolution (EDGE) handsets and modules.
The SKY77528 consists of a GSM850/EGSM900 PA block and a DCS1800/PCS1900 PA block,
impedance-matching circuitry for 50 Ω inputs and outputs, a multi-function PA control block, low-
pass harmonic rejection filter, and a transmit/receive antenna switch.
Two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto an Indium Gallium
Phosphide (InGaP) die; one block supports the GSM850 and EGSM900 bands, the other supports the
DCS1800 and PCS1900 bands. The InGaP die, the Silicon (Si) die, the PHEMT die, and the passive
components are mounted on a multi-layer laminate substrate. The entire assembly is encapsulated
with plastic overmold.
Pad signals BS1 and BS2 select the GSM/EGSM or DCS/PCS frequency bands. The TX_EN pad signal
selects transmit or receive mode of the respective RF switch. MODE pad circuitry selects GMSK
modulation or EDGE modulation. The VRAMP pad controls the output power for GMSK modulation and
provides bias optimization for EDGE modulation depending on the state of the MODE pad.
An integrated Multi-Function Control (MFC) circuit provides closed loop power control in GMSK mode,
reducing sensitivity to antenna load, input drive, temperature, power supply, and process variation. In
EDGE mode, the MFC configures the PA for fixed gain and provides the ability to optimize the PA bias
operation at different power levels. The VDET pad is used to detect saturation conditions in GMSK
mode (which automatically reduces the VRAMP output) and for power control in EDGE mode.
The functional block diagram for the 34-pad Multi-Chip Module (MCM) package is shown in Figure 1.
Figure 1. SKY77528 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201050A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • March 11, 2009
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1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet SKY77528.PDF ] | |
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