NJU8753 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJU8753

Analog Signal Input Class D Amplifier with DC-DC Converter for Piezo Speaker

Japan Radio Corporation  

NJU8753

Note 4) Test system of the output THD and S/N

The output THD and S/N are tested in the system shown in Figure 1, where a 2nd-order LC LPF and

another filter incorporated in an audio analyzer are used.

Input Signal

NJU8753

2nd-order

LC LPF

Filter

20kHz

(AES17)

THD

Measuring

Apparatus

NJU8753 Test Board

Audio Analyzer

Figure 1. Output THD and S/N Test System

2nd-order LC LPF

Filters

: Refer to “Typical Application Circuit”

: 22Hz HPF + 20kHz LPF(AES17)

(with the A-Weight filter for S/N and Dynamic-range tests)

-6-

Ver.2003-09-26

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