ZXCD1000
HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION
DESCRIPTION
The ZXCD1000 provides complete control and
modulation functions at the heart of a high efficiency
high performance Class D switching audio amplifier
solution. In combination with custom output
magnetics (ZXFN1000) and Zetex HDMOS MOSFET
devices, the ZXCD1000 provides a high performance
Class D audio amplifier with all the inherent benefits of
Class D.
The ZXCD1000 solution uses proprietary circuitry and
magnetic technology to realise the true benefits of
Class D without the traditional drawback of poor
distortion performance. The combination of circuit
design, magnetic component choice and layout are
essential to realising these benefits.
The ZXCD1000 reference designs give output powers
up to 50W rms with typical open loop (no feedback)
distortions of less than 0.2% THD + N over the entire
audio frequency range at 90% full output power. This
gives an extremely linear system. The addition of a
minimum amount of feedback (10dB) further reduces
distortion figures to give < 0.1 % THD + N typical at
1kHz.
From an acoustic point of view, even more important
than the figures above, is that the residual distortion is
almost totally free of any crossover artifacts. This
allows the ZXCD1000 to be used in true hi-fi
applications. This lack of crossover distortion, sets the
ZXCD1000 solutions quite apart from most other
presently available low cost solutions, which in
general suffer from severe crossover distortion
problems.
FEATURES
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90% efficiency
4 / 8
Ω
drive capability
Noise Floor -115dB for solution
Flat response 20Hz - 20kHz
High gate drive capability ( 2200pF)
Very low THD + N 0.1% typical full power full
band ( for the solution)
Complete absence of crossover artifacts
OSC output available for sync in multi-channel
applications
Available in a 16 pin eQSOP package
APPLICATIONS
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Automotive audio systems
Home Theatre
Multimedia
Wireless speakers
Portable audio
Sub woofer systems
Public Address system
THD + N (%)
Distortion v Power
8Ω open loop at 1kHz.
10W
1W
5W
Output Power
The plot shows Distortion v Power into an 8Ω load at 1kHz. This plot clearly demonstrates the unequalled
performance of the Zetex solution. Typical distortion of 0.05% at 1W can be seen with better than 0.15% at 10W.
Truly world class performance.
ISSUE 1 -MARCH 2001
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