Stereo Audio Class-D Amp
AKEMD
AKEMD CONFIDENTIAL
[AK7844] www.DataSheet4U.com
AK7844
Stereo Audio Class-D Amp with Power Booster for Piezo Sp...
Description
AKEMD
AKEMD CONFIDENTIAL
[AK7844] www.DataSheet4U.com
AK7844
Stereo Audio Class-D Amp with Power Booster for Piezo Speakers
GENERAL DESCRIPTION
THE AK7844 is Stereo Class-D amplifier for driving Piezo-Electric Speakers. Built-in Boost DCDC converter generates adequate high voltage for driving Piezo Speakers from Li-Ion battery. AKM state-of-the-art filter-less solution eliminates LC-filters, which are normally required at Class-D outputs. That contributes to total space saving. Class-D operation ensures higher power efficiency, and couple with Piezo Speaker that is low-powerconsumption and low-profile figure. The AK7844 is very applicable for cellular phones with piezo speakers.
FEATURES □ Class-D Amplifier : Piezo-Electric Speaker Driver Single-ended analog Input BTL output Output voltage = 8Vrms @VDD1=8.75V Filter-less solution Stereo mode Pop noise suppressor Output short protection □ Boost DCDC Converter : Input voltage (Battery) = 2.7V ∼ 4.5V Æ Boosted voltage will be 8.75V Over-current protection Over-voltage protection □ Control function : Pre-gain amplifier −6dB ∼ +15dB, 3dB step Built-in Second order lowpass filter at Input. Cutoff Frequency (4kHz,8kHz,16kHz) Power-on/off control Over-temperature protection □ Operational voltage
* Adjustable by Pin (PG0, PG1 and PG2) control
* Adjustable by Pin (PG0, PG1 and PG2) control
: VBAT=2.7V ∼ 4.5V、DVDDI=1.65V ∼ 4.5V : −30°C ∼ 85°C
□ Operational temperature □ Package
: 31pin WL-CSP (3....
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