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PDF ZXCD1010 Data sheet ( Hoja de datos )
| Número de pieza | ZXCD1010 | |
| Descripción | HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION | |
| Fabricantes | Zetex Semiconductors | |
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ZXCD1010
HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION
DESCRIPTION
The ZXCD1010 provides complete control and
modulation functions at the heart of a high efficiency
high performance Class D switching audio amplifier
solution. In combination with matched output
magnetics and Zetex HDMOS MOSFET devices, the
ZXCD1010 provides a high performance Class D audio
amplifier with all the inherent benefits of Class D.
The ZXCD1010 is an enhanced version of the
ZXCD1000. The timing resistor for the oscillator is
taken off the chip enabling improved oscillator
frequency matching device to device.
The ZXCD1010 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 ZXCD1010 reference designs give output powers
up to 100W 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, the residual distortion is almost
totally free of any crossover artifacts. This allows the
ZXCD1010 to be used in true hi-fi applications. This lack
of crossover distortion, sets the ZXCD1010 solutions
quite apart from most other presently available
solutions.
FEATURES
• 90% efficiency
• External ROSC COSC for improved accuracy
• 4 / 8 Ω drive capability
• Noise Floor -115dB for solution
• Flat response 20Hz - 20kHz
• High gate drive capability ( 2200pF)
• Very low THD + N 0.2% typical of full power up to
90% ( for the solution)
APPLICATIONS
• DVD receivers
• Automotive audio systems
• Home Theatre
• Multimedia
• Wireless speakers
• Portable audio
• Sub woofer systems
• Public Address systems
• Complete absence of crossover artifacts
• OSC output available for sync in multi-channel
applications
Distortion v Power (8⍀ open loop at 1kHz.)
• Available in a 16 pin exposed pad QSOP package
• Refer to ZXCD1000 data sheet for typical
characteristics and applications indormation
ISSUE 3 - NOVEMBER 2003
1
SEMICONDUCTORS
1 page  
ZXCD1010
Audio A/B
Triangle A/B
PWM Comparator
Audio A/B
O/P
Comparator O/P
(Duty Cycle = 50%)
Triangle A/B
Audio A/B
O/P
Comparator O/P
(Duty Cycle = 75%)
Triangle A/B
Audio A/B
Triangle A/B
Comparator O/P
(Duty Cycle = 25%)
Figures 3a,3b,3c and 3d
The audio input Pulse Width Modulates the comparator output
With no audio input signal applied, the AudioA/B
inputs are biased at the mid-point of the triangular
wave, and the duty cycle at the output of the
comparators is nominally 50%. As the AudioA/B signal
ascends towards the peak level, the crossing points
with the (higher frequency) triangular wave also
ascend. The comparator monitoring these signals
exhibits a corresponding increase in output duty cycle.
Similarly, as the AudioA/B signal descends, the duty
cycle is correspondingly reduced. Thus the audio input
Pulse Width Modulates the comparator outputs. This
principle is illustrated in Figures 3a, b, c and d. The
comparator outputs are buffered and used to drive the
OutA and OutB outputs. These in turn drive the speaker
load (with the audio information contained in the PWM
signal) via the off chip output bridge and single stage
L-C filter network.
The ramp amplitude is approximately 1V. The AudioA,
AudioB, TriangleA and TriangleB inputs are internally
biased to a DC voltage of approximately VCC/5. The
mid - point DC level of the OscA and OscB triangular
outputs is around 2V. The triangular wave at the Cosc
pin traverses between about 2.7Vand 3.8V and the dist
pin exhibits a roughly square wave from about 1.4V to
2V. (The above voltages may vary in practice and are
included for guidance only).
ISSUE 3 - NOVEMBER 2003
5
SEMICONDUCTORS
5 Page 
ZXCD1010
1W
10W
5W
Output Power
THD v Power into 4 at 1kHz
20W
f(Hz)
FFT of distortion and noise floor at 1W (4 load)
f(Hz)
f(Hz)
Frequency response (4 load)
Note roll off.
This can be corrected by using an alternative values for
output filter components.
FFT of distortion and noise floor at 20W (4 load)
ISSUE 3 - NOVEMBER 2003
11
SEMICONDUCTORS
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ZXCD1010.PDF ] | |
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