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AK7844

Asahi Kasei Microsystems
Part Number AK7844
Manufacturer Asahi Kasei Microsystems
Description Stereo Audio Class-D Amp
Published Aug 27, 2010
Detailed Description AKEMD AKEMD CONFIDENTIAL [AK7844] www.DataSheet4U.com AK7844 Stereo Audio Class-D Amp with Power Booster for Piezo Sp...
Datasheet PDF File AK7844 PDF File

AK7844
AK7844

Overview
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.
0mm × 3.
0mm, 0.
5mm pitch) Rev.
00 －1– 2007/08 AKEMD AKEMD CONFIDENTIAL [AK7844] www.
DataSheet4U.
com BLOCK DIAGRAM FC１ FC0 PG 2 PG 1 PG 0 DVDDI PDN VBAT Power Booster VCOIL VFB ERRO VSS3 VDD1 INL Pre GainL Fc: 4/8/16kHz LPF L Class-D AMP L VCLN VCLP VSS1 -6 ～ +15dB 3dB step VSS4 VDD2 VCRN VCRP VSS2 INR Pre GainR VREF LPF R Class-D AMP R VC Figure 1.
BLOCK DIAGRAM Rev.
00 －2– 2007/08 AKEMD AKEMD CONFIDENTIAL [AK7844] www.
DataSheet4U.
com PIN ASSIGNMENT A B C D E F 6 5...


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