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EDGE downlink support
Description
The CX74063 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 CX74063 supports GSM850, EGSM900,
DCS1800, and PCS1900 applications. The receiver also supports
downlink Enhanced Data-Rate GSM Evolution (EDGE).
The receive path implements a direct down-conversion
architecture that eliminates the need for Intermediate Frequency
(IF) components. The CX74063 receiver consists of three
integrated Low Noise Amplifiers (LNAs), a quadrature
demodulator, tunable receiver baseband filters, and a DC-offset
correction 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 CX74063 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.
The CX74063 is available as a 56-pin RFLGA鈩?8x8 mm package
with either a circular ground pad or a four-quadrant ground pad.
Package dimensions are shown in Figures 1 and 2.
Features
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Direct down-conversion receiver eliminates the external image
reject/IF filters
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Three separate LNAs with single-ended inputs
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RF gain range: GSM = 20 dB, DCS/PCS = 22 dB. Baseband gain
range = 100 dB
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Gain selectable in 2 dB steps
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Integrated receive baseband filters with tunable bandwidth
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Integrated DC offset correction sequencer
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Reduced filtering requirements with translational loop transmit
architecture
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Integrated transmit VCOs
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Wide RF range for quad band operation
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Integrated PAC loop
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Single integrated, fully programmable fractional-N synthesizer
suitable for multi-slot GPRS operation
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Fully integrated wideband UHF VCO
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Integrated crystal oscillator
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Separate enable lines for power management transmit, receive,
and synthesizer modes
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Supply voltage down to 2.6 V
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Band select and front-end enable states may be exercised on
output pins to control external circuitry
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Low external component count
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Optional bypass of baseband filtering for use with high dynamic
range ADCs for current savings
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Interfaces to low dynamic range ADC
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Meets AM suppression requirements without baseband
interaction
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56-pin RFLGA 8x8 mm package
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Low power standby mode
Skyworks Solutions, Inc. 鈥?Phone [781] 376-3000 鈥?Fax [781] 376-3100 鈥?sales@skyworksinc.com 鈥?www.skyworksinc.com
103008B 鈥?Skyworks Proprietary and Confidential information 鈥?Products and product information are subject to change without notice 鈥?January 27, 2004
1
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