DIGITAL SATELLITE BROADCAST CHIP-SET OFFERS LOW-COST, POWER MINIATURIZ

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DIGITAL SATELLITE BROADCAST CHIP-SET OFFERS LOW-COST, POWER MINIATURIZ

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CXA3108Q CXA3038N
DIGITAL SATELLITE BROADCAST CHIP-SET OFFERS LOW-COST, POWER MINIATURIZED TUNER BLOCK SOLUTION
atellite broadcasting using digital modulation first entered U.S. market 1994. Today, digital satellite broadcasting expanding rapidly world markets, OEMs looking smaller, more cost effective components meet growing demand.
figure
Sony Semiconductor Company America recently announced tuner chip-set digital satellite broadcasting that integrates functions tuner just chips figure reducing size number chips, provides cost, easily integrated tuner block. chip-set con-
Reception Set-top Block Diagram
Set-top Tuner pack Converter Channel Selection CXA3108Q Filter Quadrature Demodulation CXA3038N
Video output Audio output
MPEG Decoder
Descrambler
QPSK Demodulation Error Correction CXD1961AQ
figure
CXA3108Q
from Mix.
CXA3108Q CXA3038N Block Diagrams
Gain controller mix. amp. Output buffer amp. +90°
CXA3038N
480MHz
mix. clock Osc. 1T379 1T379 Loop Filter (SDA, SCL) 3-wire (DAT, ENA) Loop Filter osc.
Osc.
Freq. adjust
sists CXA3108Q CXA3038N part Sony's Virtuoso family digital media devices figure CXA3108Q takes full advantage Sony's high-speed bipolar process integrating oscillator/mixer circuit L-band down converter functions phase lock loop (PLL) circuit channel selection single chip rather than chips
previously required. onboard control function supports both three-wire allowing wider range reference frequencies. benefits this integration realized newly developed high-frequency linear process 30GHz). Sony also offers unique differential Colpitts oscillator circuit, allowing this device provide stable oscillator signal
with parasitic oscillation over wide band 2.7GHz. shown figure frequency conversion characteristics extremely flat produce high gain noise. CXA3038N features adjustment-free carrier recovery through
on-chip circuit. This function required 480MHz band quadrature detection whenever on-chip circuit present figure Because circuit includes divide data, replace high-cost resonator eliminate need external
figure
CXA3108Q Frequency Conversion Characteristics
fIF=480MHz (conversion gain)
(dB) (noise figure)
Reception Frequency (GHz)
figure
CXA3038N Quadrature Error
amplitude error (dB)
750mVp-p 1000mVp-p phase error (deg)
Input Level (dBm)
control. CXA3038N includes converter allowing carrier frequency adjusted +450kHz steps from center frequency 479.5MHz
SUPPORT WIDE RANGE APPLICATIONWhile integrating features tuner block, Sony designed chip-set support wide range applications such single-unit
tuners both analog digital satellite broadcasts tuners both broadcasts. This achieved integrating output circuit systems CXA3108Q external input circuit. CXA3038N features on-chip 32-frequency divider local oscillator signals. This enables support older carrier recovery techniques when circuit
included QPSK demodulation devices consume 350mW 250mW power respectively significant reduction over previous solutions. This feature makes chip-set optimal stream output tuner pack products that implement whole tuner QPSK demodulation error correction circuit, which typically generates significant amount heat.
Sony's integration high-frequency/low-noise analog circuits high-speed digital circuits, well ability suppress mutual interference between circuits, offers highest functionality lowest number chips. This chip-set will greatly contribute reduced cost significant miniaturization digital satellite broadcast tuner blocks.

DIGITAL SATELLITE BROADCAST CHIP-SET OFFERS LOW-COST, POWER MINIATURIZ

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