技術(shù)規(guī)格

詳細描述

MAS6240 是一種壓電驅(qū)動器設(shè)備，可以從 3V 電源驅(qū)動高達 18Vpp 的輸出。內(nèi)部三模式電荷泵為壓電驅(qū)動器產(chǎn)生升壓電源電壓。為了調(diào)節(jié)壓電元件的音量，電荷泵可以在 1x、2x 或 3x 模式下運行。在 1x 模式下，輸出電壓與輸入電壓相同，而在 2x 或 3x 模式下，輸入電壓相應(yīng)地升高。

MAS6240 是一種簡單且低成本的 peizo 驅(qū)動器解決方案，因為除了聲音元件之外只需要 4 個小容量電容器。不需要電感器。這種設(shè)計還大大減少了對周圍電路的干擾，使其成為敏感設(shè)計的理想選擇。其電荷泵以 1MHz 開關(guān)，允許使用小至 100nF 的外部電容器。

控制邏輯在數(shù)字輸入 (DIN) 引腳的個上升信號時打開電荷泵。當 DIN 上的信號一直處于低電平 50ms 時，就會產(chǎn)生關(guān)斷信號。壓電驅(qū)動器在 DIN 脈沖的第二個上升沿啟用，信號傳輸?shù)綁弘娸敵?VO1。相同的信號被反相為差分輸出的輸出 VO2。

DIN 輸入端的持續(xù)高邏輯電平會導致電荷泵開啟，但音頻放大器處于禁用狀態(tài)。在這種狀態(tài)下，電荷泵輸出可用于為外部 LED 或任何其他外部電路供電。輸出電壓仍可分三步選擇。在“禁用"模式下（DIN 通常為低電平 15ms），所有功能塊都關(guān)閉以實現(xiàn)小于 1μA 的靜態(tài)電流。

The MAS6240 is a piezo driver device that can drive outputs up to 18Vpp from a 3V supply. An internal three-mode charge pump generates a boosted supply voltage for the piezo driver. To adjust the piezo element sound volume, the charge pump can operate in either 1x, 2x or 3x mode. In 1x mode the output voltage is the same as the input voltage while in 2x or 3x mode the input voltage is boosted accordingly.

The MAS6240 is an easy and low-cost peizo driver solution since only 4 small value capacitors are needed in addition to the sound element. No inductors are required. This design also causes significantly less disturbance to the surrounding circuits making it an ideal choice for sensitive designs. Its charge pump switches at 1MHz, allowing the use of external capacitors as small as 100nF.

Control logic switches the charge pump on at the first rising signal of the digital input (DIN) pin. The switch-off signal is generated while the signal at DIN has been low for 50ms. The piezo driver is enabled at a second rising edge of a pulse at DIN and the signal is transferred to piezo output VO1. The same signal is inverted into output VO2 for the differential output.

A continuous high logic level at the DIN input causes the charge pump to be turned ON but leaves the audio amplifier disabled. In that state the charge pump output can be used to power the external LEDs or any other external circuit. The output voltage is still selectable in three steps. In "disabled" mode (DIN has been low for 15ms typically) all functional blocks are switched off to achieve a quiescent current of less than 1μA.

規(guī)格書和資料

Data Sheet