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PDF SKY74068-11 Data sheet ( Hoja de datos )
| Número de pieza | SKY74068-11 | |
| Descripción | Dual-Mode Transmitter | |
| Fabricantes | Skyworks Solutions | |
| Logotipo |  |
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PRODUCT SUMMARY
SKY74068-11: Dual-Band, Dual-Mode Transmitter for CDMA,
AMPS, and PCS Mobile Handset Applications
Applications
• Dual-band, dual-mode handsets
• Cellular and PCS band phones
− CDMA and AMPS modes in the cellular band
− CDMA mode in the PCS band
Features
• Low power consumption in all operating modes
• Direct upconversion architecture
• Device controlled using a three-wire read/write serial bus
interface with independent supply voltage
• Baseband RC filter to reject receive band noise
• Fully integrated VCO with auto-tuning
• Dual-mode fractional-N/integer-N PLL
• Variable gain PA drivers
• Differential cellular driver output matched to 200 Ω
• Single-ended PCS driver output matched to 50 Ω
• Transmit power control with >85 dB dynamic range
• Low current consumption at low transmit power minimizes
current consumption and noise
• Hardware TX_ENABLE for gated mode operation
• RFLGA™ (32-pin, 5 x 5 x 1 mm) Pb-free (MSL3, 260 °C per
JEDEC J-STD-020) package with downset paddle
Description
The SKY74068-11 transmitter is a highly integrated device for
dual-band Code Division Multiple Access (CDMA) handsets in the
cellular CDMA, Advanced Mobile Phone System (AMPS), and
Personal Communications System (PCS) modes.
The device requires a minimum number of external components
to complete a CDMA radio subsystem. Included on-chip are the
baseband filter, direct upconversion In-Phase and Quadrature (I/Q)
mixers, variable gain power amplifier (PA) drivers, a fully
integrated Voltage Controlled Oscillator (VCO) with Local Oscillator
(LO) generation blocks, and a dual-mode fractional-N/integer-N
Phase Locked Loop (PLL).
External components needed for operation include bias resistors,
bypass capacitors, and passives to comprise the PLL loop filter.
The signal enters the chip as an analog baseband I/Q signal. It is
filtered by the baseband filter and upconverted to the desired RF
transmit frequency. The signal is amplified by one of two
upconverters, depending on whether the chip is operating in
cellular or PCS mode. The resulting signal is fed through the
appropriate PA driver stage to provide variable output power and
to drive the external PA. The signal is then filtered by an external
Surface Acoustic Wave (SAW) filter and sent to the PA to obtain
the final rated power.
A functional block diagram for the SKY74068-11 is shown in
Figure 1.
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200600C • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • September 16, 2007
1
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