PAM8303C

Document number: DS36438 Rev.2 - 2

10 of 16

www.diodes.com

May 2018

© Diodes Incorporated

PAM8303C

Application Information

Test Setup for Performance Testing (Notes 5 & 6)

Notes:

5. The AP AUX-0025 low-pass filter is necessary for Class-D amplifier measurement with AP analyzer.

6.

Two 22μH inductors are used in series with load resistor to emulate the small speaker for efficiency measurement.

















V

V

R

k

150

x

2

Gain

I

Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios

of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is

recommended to use 1% tolerance resistors or better to keep the performance optimized. Matching is more important than overall tolerance.

Resistor arrays with 1% matching can be used with a tolerance greater than 1%.

Place the input resistors very close to the PAM8303C to limit noise injection on the high-impedance nodes.

equation.

C

R

2

1

f

I

I

C





is 150k

Ω, and the specification calls for a flat bass, response is down to 150Hz. The equation is reconfigured as follows.

F

R

2

1

C

CI

I

I





input to the amplifier that reduces useful headroom, especially in high-gain applications.

For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the

Note that it is important to confirm the capacitor polarity in the application.