Www.zetex.com Zetex Switching Audio Amplifiers. ZX Series Class D amplifiers ZXCD1000: Analog input class D amplifier Best in class sound.

www.zetex.com

ZetexSwitching Audio Amplifiers

www.zetex.com

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

www.zetex.com

ZXCD1000Analog input Class D amplifier controller

www.zetex.com

The ZXCD1000 modulator device

Mono BTL output drive Stereo Single-ended drive Precision triangle generator PWM comparators QSOP16 package

www.zetex.com

ZXCD1000: Performance

Exceptional open loop linearity Very high efficiency Low noise Excellent frequency response No high order crossover artifacts Closed loop solutions possible

www.zetex.com

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

www.zetex.com

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))

www.zetex.com

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

www.zetex.com

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

www.zetex.com

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

www.zetex.com

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)

www.zetex.com

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

www.zetex.com

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)