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Zetex Switching Audio Amplifiers

Zetex Switching Audio Amplifiers. ZX Series Class D amplifiers. ZXCD1000: Analog input class D amplifier Best in class sound performance Used in applications from 25W to 10 0W Applications range from DVD-Receiver to sound reinforcement amplifier.

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Zetex Switching Audio Amplifiers

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  1. ZetexSwitching Audio Amplifiers

  2. 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

  3. ZXCD1000Analog input Class D amplifier controller

  4. The ZXCD1000 modulator device • Mono BTL output drive • Stereo Single-ended drive • Precision triangle generator • PWM comparators • QSOP16 package

  5. ZXCD1000: Performance • Exceptional open loop linearity • Very high efficiency • Low noise • Excellent frequency response • No high order crossover artifacts • Closed loop solutions possible

  6. 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

  7. Performance : Distortion • Exceptional linearity • THD+N<0.2% open loop • THD+N<0.05% closed loop (10dB feedback)

  8. 100.00 90.00 Zetex Class D Solution Efficiency 80.00 70.00 Efficiency (%) 60.00 50.00 40.00 Typ Class A-B Efficiency 30.00 20.00 10.00 0.00 0.00 5.00 10.00 15.00 20.00 25.00 Output Power (W) Performance: Efficiency • Greater than 90% efficient • Maximum efficiency over full output power range • Smaller power supply • Smaller solution & less heat

  9. -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 dB -70 -75 -80 -85 -90 -95 -100 -105 -110 -115 -120 -125 -130 2k 4k 6k 8k 10k 12k 14k 16k 18k 20k Frequency Hz Performance: Noise floor • Noise floor at -115dB • FFT shows flat noise floor • Only clock harmonics visible at -80dB • Most linear amps only achieve -90dB

  10. Performance: Frequency response • Flat response from 20Hz to 22KHz

  11. Zetex Class-D Amplifier Design Requirement • Zetex’s Class-D Designs for 25W ~100W Output Analog Audio Input (L / R) ZXCD1000 ZXCD1000 • 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)

  12. Competitor’s Digital Class-D Designs PCM Analog Audio Input (L / R) A-D Converter PCM to PWM DSP PWM MCU • 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

  13. ZXCD1000: Reference designs • Reference designs are key to success • Circuit designs are available • Full bill of materials available • Layout (Gerber) files available • Demonstrationboards available • Current reference designs • 25W solution (mono) • 25W solution (stereo) • 50W solution (stereo) • 50W solution (5.1) • 100W (mono)

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