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Transcript of Www.zetex.com Zetex Switching Audio Amplifiers. ZX Series Class D amplifiers ZXCD1000: Analog input...
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ZetexSwitching Audio Amplifiers
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ZX Series Class D amplifiers
ZXCD1000: Analog input class D amplifier
Best in class sound performance
Used in applications from 25W to 100W
Applications range from DVD-Receiver to sound reinforcement amplifier
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ZXCD1000Analog input Class D amplifier controller
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The ZXCD1000 modulator device
Mono BTL output drive Stereo Single-ended drive Precision triangle generator PWM comparators QSOP16 package
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ZXCD1000: Performance
Exceptional open loop linearity Very high efficiency Low noise Excellent frequency response No high order crossover artifacts Closed loop solutions possible
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ZXCD1000: Performance (open loop)
THD @ 1W 0.05%
THD+N @ 90% power 0.2%
Noise floor -115dB
Frequency response flat 20Hz to 20kHz
Output power 25W to 200W
Efficiency >90%
Anti-pop Yes
Mute Yes
Protection Yes
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Performance : Distortion
Exceptional linearity THD+N<0.2% open loop THD+N<0.05% closed
loop (10dB feedback)
0.2
2.4
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
TH
D (
%)
30m 2050m 100m 200m 500m 1 2 5 10
Output Power (W))
0.2
2.4
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
TH
D (
%)
30m 2050m 100m 200m 500m 1 2 5 10
Output Power (W))
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Performance: Efficiency
Greater than 90% efficient Maximum efficiency over
full output power range Smaller power supply Smaller solution & less
heat
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0.00 5.00 10.00 15.00 20.00 25.00
Output Power (W)
Eff
icie
ncy
(%
) Zetex Class D Solution Efficiency
Typ Class A-B Efficiency
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Performance: Noise floor
Noise floor at -115dB FFT shows flat noise floor Only clock harmonics
visible at -80dB Most linear amps only
achieve -90dB-130
-20
-125
-120
-115
-110
-105
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-25
dB
2k 20k4k 6k 8k 10k 12k 14k 16k 18k
Frequency Hz
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Performance: Frequency response
+4
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
+0
+1
+2
+3
dB
20 20k50 100 200 500 1k 2k 5k 10k
Frequency Hz
+4
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
+0
+1
+2
+3
dB
20 20k50 100 200 500 1k 2k 5k 10k
Frequency Hz
Flat response
from 20Hz to
22KHz
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Zetex Class-D Amplifier Design Requirement
Zetex’s Class-D Designs for 25W ~100W Output
ZXCD1000
ZXCD1000
Analog Audio Input (L / R)
- Full protection features included.- MCU software control free! (Plug & Play!).- High design flexibility for different power requirement.- Enhancement of sound quality.- Low signal conversion loss (Analog PWM only)
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Competitor’s Digital Class-D Designs
PCM to PWM DSP
A-D Converter
Analog Audio Input (L / R)
PCM
PWM
- Required MCU software control.- Limited protection features and design flexibility due using fixed power stage.- Fixed sound quality.- High signal conversion loss (Analog PCM PWM) that lead lower S/N ration and higher THD+N
MCU
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ZXCD1000: Reference designs
Reference designs are key to success Circuit designs are availableFull bill of materials availableLayout (Gerber) files availableDemonstration boards available
Current reference designs25W solution (mono)25W solution (stereo)50W solution (stereo)50W solution (5.1)100W (mono)