PRODUCT SUMMARY
SKY74963: RF Transceiver With Power Ramping Controller
and Integrated Crystal Oscillator for Multi-Band GSM, GPRS,
and EDGE Applications
Applications
•
GSM850, EGSM900, DCS1800, and PCS1900 handsets
•
GPRS handsets and modules
•
EDGE downlink support
Description
The SKY74963 RF transceiver is a highly integrated device for
multi-band Global System for Mobile Communications (GSM) or
General Packet Radio Service (GPRS) applications. The device
requires a minimal number of external components to complete a
GSM radio subsystem. The SKY74963 supports GSM850,
EGSM900, DCS1800, and PCS1900 applications. The receiver
also supports Enhanced Data for GSM Evolution (EDGE) downlink
applications.
The receive path implements a direct down-conversion
architecture that eliminates the need for Intermediate Frequency
(IF) components. The SKY74963 consists of three integrated Low
Noise Amplifiers (LNAs), a quadrature demodulator, tunable
receiver baseband filters, and a DC Offset Correction (DCOC)
sequencer.
In the transmit path, the device consists of an In-phase and
Quadrature (I/Q) modulator within a frequency translation loop
designed to perform frequency up-conversion with high output
spectral purity. This loop also contains a phase-frequency
detector, charge pump, mixer, programmable dividers, and high
power transmit Voltage Controlled Oscillators (VCOs) with no
external tank required. With the integrated gain controller (and an
integrator ), the device realizes the Power Amplifier Control (PAC)
functionality when combined with a coupler, a Radio Frequency
(RF) detector, and a Power Amplifier (PA).
The SKY74963 also features an integrated, fully programmable,
sigma-delta fractional-N synthesizer suitable for GPRS multi-slot
operation. Except for the loop filter, the frequency synthesizer
function, including a wideband VCO, is completely on-chip. The
reference frequency for the synthesizer is supplied by the
integrated crystal oscillator circuitry.
A functional block diagram is provided in Figure 1.
Skyworks offers lead (Pb)-free “environmentally
friendly” packaging that is RoHS compliant
(European Parliament for the Restriction of
Hazardous Substances).
Features
•
Direct down-conversion receiver eliminates the external image
reject/IF filters
•
Three separate LNAs with single-ended inputs
•
RF gain range: GSM = 20 dB, DCS = 22 dB, PCS = 20 dB.
Baseband gain range = 100 dB
•
Gain selectable in 2 dB steps
•
Integrated receive baseband filters with tunable bandwidth
•
Integrated DCOC sequencer
•
Reduced filtering requirements with translational loop transmit
architecture
•
Integrated transmit VCOs
•
Wide RF range for multi-band operation
•
Integrated PAC loop
•
Single integrated, fully programmable fractional-N synthesizer
suitable for multi-slot GPRS operation
•
Fully integrated wideband UHF VCO
•
26 MHz integrated crystal oscillator with 26 MHz output
(SKY74963-23) or 13 MHz output (SKY74963-32) options
•
Separate enable lines for power management transmit, receive,
and synthesizer modes
•
Supply voltage down to 2.6 V
•
Band select and front-end enable states may be exercised on
output pins to control external circuitry
•
Low external component count
•
Optional bypass of baseband filtering for use with high dynamic
range ADCs for current savings
•
Interfaces to low dynamic range ADC
•
Meets AM suppression requirements without baseband
interaction
•
Low power standby mode
•
RFLGA™ (56-pin, 8 x 8 mm) Pb-free package (MSL3, 260
°C
per JEDEC J-STD-020)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
103242B • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • November 29, 2004
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SKYWORKS [ SKYWORKS SOLUTIONS INC. ]
