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NJU8752

Analog Signal Input Class D Amplifier for Piezo Speaker

Japan Radio Corporation  

NJU3857552

Note 4) Test system of the output T.H.D., S/N, Dynamic Range

The output T.H.D., S/N and dynamic range 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

NJU8752

2nd-order

LC LPF

Filter

20kHz

(AES17)

THD

Measuring

Apparatus

NJU8752 Test Board

Audio Analyzer

Figure 1. Output T.H.D., S/N and Dynamic Range Test System

2nd-order LPF

Filters

: fc=34kHz / Refer to “Typical Application Circuit”.

: 22Hz HPF + 20kHz LPF(AES17)

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

-5-

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