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SM6801AB データシート(PDF) 9 Page - Nippon Precision Circuits Inc |
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SM6801AB データシート(HTML) 9 Page - Nippon Precision Circuits Inc |
9 / 16 page SM6801A SEIKO NPC CORPORATION —9 FUNCTIONAL DESCRIPTION Power-down (PDWN) The device enters power-down mode when PDWN goes LOW. When powered-down, the outputs become high impedance and the internal oscillation stops. In power-down mode, the MUTEN pin should be held LOW. Mute (MUTEN) Mute operation occurs when MUTEN goes LOW. In mute mode, the outputs become high impedance. During mute operation, the protection circuit operation is disabled, but the outputs are protected against output short circuits by their high impedance state. When power is applied, MUTEN should be held LOW for a short inter- val, shown in the timing diagram below, to prevent pop noise from the speaker. Also, applying and releasing mute operation after power is applied can occur at high speed without generating pop noise. Note. VREF1 load capacitance = 1 µF Protection Circuit The protection circuit operates if there is an output short-circuit to the supply, short-circuit to ground, or other excessive load abnormal condition lasting longer than approximately 1 µs. Normal operation resumes after approximately 5 seconds. When the protection circuit becomes active, the outputs become high impedance. The usage with direct coupling to load is recommended for operating VDD1, VDD2, VDD3 and VDD4 at ≤ 2.4V. When using LC-type LPF, the ringing phenomena due to rush current may be judged as short-circuit of the load. In this case, the normal operation will start after the mute for 5 seconds. PDWN min. 40msec MUTEN |
同様の部品番号 - SM6801AB |
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同様の説明 - SM6801AB |
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