ZXCD1210

Issue 2 - October 2007

5

www.zetex.com

© Zetex Semiconductors plc 2007

Applications information

The high performance ZXCD1210 modulator IC forms the heart of the Zetex series of analog input

Class D amplifier reference designs. The modulator device provides complete control of the

modulation function.

Details of these reference designs are contained in individual data sheets: ZXCDSUBEV series,

ZXCD50STEVAL and ZXCD100MOEVAL as well as the ZXCD series design guide.

The ZXCDSUBEV series of reference circuits are specifically designed for subwoofer applications.

These switching amplifiers owe much of their outstanding audio performance to a unique

feedback architecture designed to reduce distortion. By taking its feedback signal from the filtered

amplifier output, the high gain circuit design compensates for bridge mismatches and filter non-

linearities, to achieve a reduction in THD+N across the entire power band.

ZXCDSUBEV series architecture

ZXCDSUBEV series THD+N versus power

PWM

output

Output

bridge

Filter

Audio

input

Gate

driver

+

-

DC

Servo

AC comp

network

Feedback circuits

Bridge

supply

Input

buffering

and bias

Mute

ZXCD1210

+

-

DC

Servo

AC comp

network

Feedback circuits

Mute

ZXCD1210

0.02

0.3

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22

0.24

0.26

0.28

100m

500

200m

500m

1

2

5

10

20

50

100

200

Output Power (W)

0.02

0.3

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22

0.24

0.26

0.28

100m

500

200m

500m

1

2

5

10

20

50

100

200

Output Power (W)