ZXCD1210JB16TA Datasheet ZXCD1210JB16TA | P4-P6

ZXCD1210

Issue 2 - October 2007 4 www.zetex.com

Functional description

On chip series regulators drop the external V

supply (12V recommended) to the 9V and 5.5V

supplies required by the internal circuitry of the device.

The on chip oscillator produces a clock which is set to approximately 200kHz by an external

capacitor and an on chip resistor. The clock is set at least an order higher in frequency than the

audio input. This clock is a triangle waveform which is used to modulate the incident analogue

signal in order to produce the required PWM output.

With no audio input signal applied, the PWM duty cycle is nominally 50%. As the audio input

signal ascends towards the peak level, the crossing points with the (higher frequency) triangle

wave also ascend. The PWM output exhibits a corresponding increase in output duty cycle.

Similarly, as the audio input signal descends, the duty cycle is correspondingly reduced. Thus the

triangle modulates the audio input generating a pulse width modulated (PWM) output. This

principle is illustrated below.

The PWM outputs drive the speaker load with the audio information contained in the PWM signal,

via the off chip gate drivers, H bridge and single stage LC filter network.

The triangle amplitude is approximately 1V. The audio inputs are internally biased to a DC voltage

of approximately V

/5. The mid point DC level of the modulation control is around 2V. The

triangular wave at the CK pin traverses between about 2.7V and 3.8V.

Audio

Triangle

PWM comparator

PWM output

Audio

Comparator O/P (duty cycle = 50%)

Comparator O/P (duty cycle = 75%)

Triangle

Output

Audio

Triangle

Output

Triangle inputAudio input

PWM output

ZXCD1210

Issue 2 - October 2007 5 www.zetex.com

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

Servo

AC comp

network

Feedback circuits

Bridge

supply

Input

buffering

and bias

Mute

ZXCD1210

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

THD+N (%)

100m 500200m 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

THD+N (%)

100m 500200m 500m 1 2 5 10 20 50 100 200

Output Power (W)

ZXCD1210

Issue 2 - October 2007 6 www.zetex.com

The closed loop Class D architecture maintains high efficiency ensuring cool running in the

smallest footprint whilst achieving much reduced output impedance for tight bass control.

Additionally the feedback architecture compensates for supply dips and the bridge design

accommodates high off load voltages. This means that use of a basic SMPS or an unregulated

supply is achievable without compromising performance.

The designs feature soft start controls and under voltage lockout controls to maintain anti-pop

behavior. Design options include short circuit, thermal and DC offset protection circuits. Volume

and phase controls and high/low pass filters are simply added to the input circuitry.

The scalable architecture of the ZXCDSUBEV series utilises all N-channel output stage with either

bridge tied load (BTL) or single ended (SE) configurations, together with power supply options to

generate 150W, 300W or 500W RMS into 4⍀ designs from a single platform. Many more power

options readily produced.

The ZXCD50STEVAL stereo and ZXCD100MOEVAL mono reference designs have an open loop

architecture and feature output stages constructed using Zetex MOSFETs directly driven from the

ZXCD modulator device.

ZXCD50STEVAL THD+N versus output power

They offer 50W and 100W into 4⍀ respectively with typical THD+N of 0.5% and 0.9% up to 90%

full power. Careful design has eliminated any potential crossover distortion artifacts. Frequency

response is flat to 20kHz in these designs, typical noise floor is -110dB. These designs feature anti-

pop and over current protection and operate simply from a single supply rail.

Alternative configurations of these designs are possible with multi-channel applications simply

created with a master slave arrangement. Single ended operation is possible with the associated

performance compromises.

For further information on the ZXCD series reference designs, contact your local Zetex supplier

with details of your production project requirements.

0.2

2.4

0.4

0.6

0.8

1.2

1.4

1.6

1.8

2.2

THD+N (%)

30m 5050m 100m 200m 500m 1 2 5 10 20

Output Power (W)

0.2

2.4

0.4

0.6

0.8

1.2

1.4

1.6

1.8

2.2

THD+N (%)

30m 5050m 100m 200m 500m 1 2 5 10 20

Output Power (W)

P1-P3 P4-P6 P7-P8

ZXCD1210JB16TA

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Audio Amplifiers CLASS D MODULATOR

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