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AKEMD CONFIDENTIAL [AK7844] AK7844 Stereo Audio Class-D


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AKEMD
AKEMD CONFIDENTIAL
[AK7844]
AK7844
Stereo Audio Class-D with Power Booster Piezo Speakers
GENERAL DESCRIPTION
AK7844 Stereo Class-D amplifier driving Piezo-Electric Speakers. Built-in Boost DCDC converter generates adequate high voltage driving Piezo Speakers from Li-Ion battery. state-of-the-art filter-less solution eliminates LC-filters, which normally required Class-D outputs. That contributes total space saving. Class-D operation ensures higher power efficiency, couple with Piezo Speaker that low-powerconsumption low-profile figure. AK7844 very applicable cellular phones with piezo speakers.
FEATURES Class-D Amplifier Piezo-Electric Speaker Driver Single-ended analog Input output Output voltage 8Vrms @VDD1=8.75V Filter-less solution Stereo mode noise suppressor Output short protection Boost DCDC Converter Input voltage (Battery) 2.7V 4.5V Over-current protection Over-voltage protection Boosted voltage will 8.75V
Control function Pre-gain amplifier -6dB +15dB, step Built-in Second order lowpass filter Input. Cutoff Frequency (4kHz,8kHz,16kHz) Power-on/off control Over-temperature protection Operational voltage
Adjustable (PG0, PG2) control
Adjustable (PG0, PG2) control
VBAT=2.7V 4.5VDVDDI=1.65V 4.5V -30°C 85°C
Operational temperature Package
31pin WL-CSP (3.0mm 3.0mm, 0.5mm pitch)
Rev.00
2007/08
AKEMD
AKEMD CONFIDENTIAL
[AK7844]
BLOCK DIAGRAM
DVDDI
VBAT
Power Booster
VCOIL ERRO VSS3
VDD1
GainL
4/8/16kHz
Class-D
VCLN VCLP VSS1
+15dB step
VSS4 VDD2 VCRN VCRP VSS2
GainR VREF
Class-D
Figure BLOCK DIAGRAM
Rev.00
2007/08
AKEMD
AKEMD CONFIDENTIAL
[AK7844]
ASSIGNMENT
0.25
0.25
<TOP VIEW>
VCRP ERRO VCOIL
VDD2 VCRN VSS2 VSS4 VSS3 <Index>
DVDDI Figure Assighnment
VDD1 VCLN VSS1 VBAT
VCLP
Rev.00
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
FUNCTION
Function Connection pin. Connect ground. Inductor Boost DCDC. Gain setting pin2 (available when I2CEN="L") Phase compensation capacitor connection Boost DCDC. ERRO Connect 0.1µF capacitor between ground. VCRP Right channel Class plus output Connection pin. Connect ground. <Index> VSS3 Power Booster ground pinVSS3=0V VSS4 Internal analog circuit ground pinVSS4=0V VSS2 Right channel Class ground pinVSS2=0V VCRN Right channel Class minus output VDD2 Right channel Class power supplyVDD2=8.75V(typ.) Gain setting pin0 Gain setting pin1 Connection pin. Connect ground. Boosted voltege feedback pin. DVDDI Digital interface powerDVDDI=1.65V4.5V cutoff frequency setting pin1 Connection pin. Connect ground. Connection pin. Connect ground. Power down contorolschmitt trigger input "High"poewer up"Low"power down cutoff frequency setting pin2 Battery voltage inputVBAT=2.7V4.5V VBAT Left channel Class ground pinVSS1=0V VSS1 Left channel Class minus output VCLN Left channel Class power supplyVDD1=8.75V(typ.) VDD1 Connection pin. Connect ground. Voltage reference output. Connect 0.01µF capacitor between ground. Right channel analog signal input Left channel analog signal input VCLP Left channel Class plus output Connection pin. Connect ground. Note Digital input pins (PDN, PG2, PG1, PG0, FC1, FC0) must open. Name VCOIL
Unused Pins Unused pins should configured below. Category Name NoConnection
Configuration
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
ABSOLUTE MAXIMUM RATINGS (VSS1, VSS2, VSS3,VSS4=0V;Note Parameter Symbol Power Supplies: Battery VBAT -0.3 (Note.4) Digital DVDDI -0.3 Class-D VDD1,2 -0.3 Input Current, Except Supplies Analog Input Voltage (Note (Note VINA -0.3 VBAT+0.3 Digital Input Voltage (Note (Note VIND -0.3 DVDDI+0.3 Ambient Temperature (powered applied) Storage Temperature Tstg Note voltages with respect ground. Note VSS1, VSS2, VSS3, VSS4 must connected same analog ground plane. Note INL,INR Note PDN, PG2, PG1, PG0, FC1, Note Maximum value must exceed 6.5V even VBAT DVDDI more than 6.2V.
WARNING: Operation beyond these limits result permanent damage device. Normal operation guaranteed these extremes.
Units
RECOMMENDED OPERATING CONDITIONS
(VSS1, VSS2, VSS3, VSS4=0V; Note Parameter Symbol Power Battery (Note VBAT Supplies (Note VDDx 8.75 DigitalI/F(Note DVDDI 1.65 Note voltages with respect ground. Note Should sustain "VBAT DVDDI" condition Note Supply with boosted voltage (typ. 8.75V) Power Booster. assumes responsibility usage beyond conditions this datasheet. Units
CHARACTERISTICS
(Ta=25°C; VBAT=2.7 4.5V,DVDDI Parameter Symbol High-Level Input Voltage1 (Note VIH1 70%DVDDI Low-Level Input Voltage1 (Note VIL1 High-Level Input Voltage2 (Note VIH2 80%DVDDI Low-Level Input Voltage2 (Note VIL2 Input Leakage CurrentI Note Applied PG0, PG1, PG2. Note Applied PDN, FC1, (Summit trigger input). 30%DVDDI 20%DVDDI Units
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
ANALOG CHARACTERISTICS
(Unless otherwise noted, Input Signal Frequency =1kHz Measurement Band Width =2020kHz ,PreGain=0dB 16kHz Class-D ampu Output Load Impedance ZL=1.0uF) Parameter Condition Units input signal. T.B.D With output Load ShutdownCurrent "Low" Input Impedance PreGain Control Range PG2="Low",PG1=" Low",PG0=" Low" PG2="Low",PG1=" Low",PG0=" High" PG2="Low",PG1=" High",PG0=" Low" PG2="Low",PG1=" High",PG0=" High" PG2=" High",PG1=" Low",PG0=" Low" PG2=" High",PG1=" Low",PG0=" High" PG2=" High",PG1=" High",PG0=" Low" PG2=" High",PG1=" High",PG0=" High" VCL(R)P/VCL(R)N Input Signal=0.7Vrms VCL(R)P/VCL(R)N input signal VCL(R)P/VCL(R)N (Note Input Signal=0.5Vrms VCL(R)P/VCL(R)N (Note Input Signal=0.7Vrms using wating filter. VCL(R)P/VCL(R)N (Note Vripple=200mVpp@1kHz sinwave INLNoInput INR=2Vpp LchOutputPin monitoring. INRNoInput INL=2Vpp RchOutputPin monitoring. Class-D PowerBooster C3=0.01uF, C5=C6= 0.1uF(Note VBAT=2.7V 1000 1100 T.B.D. Vrms
PreGain Step Size (Note
Output Voltage Output Offset Voltage THD+N PSRR (Note Cross Talk Switching Frequency Startup Time (Note
Note Setting accuracy each setting within ±1dB. Monotony guaranteed. Note Measure signals between VCL(R)N L(R)P through Low-Pass-Filter (fc=20kHz). Note 200mVpp@1kHz superimposed signal VBAT pin, .and measured output. Note Time period from "PDN" turns "High" stability operation. Note Refer section "TYPICAL APPLICATION CIRCUIT".
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
OPERATION OVERVIEW Power Control
Once "Low", circuit will stop AK7844 will shut down. resumes outputs stable signal (TBD)ms after "High".
Power-Up Sequence
VBAT DVDDI must turned below. VBAT=DVDDI="ON" same time. VBAT="ON" first, then DVDDI="ON". "High" when power-on. Then, must delayed least after DVDDI High. them simultaneously.
VBAT DVDDI
Figure Power-Up Sequence Timing Diagram
VBAT DVDDI
Figure Power-Up Sequence Timing Diagram Attention: performance device will guaranteed after below sequence. DVDDI="ON" first, then VBAT="ON".
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Power-Down Sequence VBAT DVDDI must turned below. VBAT=DVDDI="OFF" same time. DVDDI="OFF" first, then VBAT="OFF". "Low" when shutdown. Then, wait necessary before stopping power supply, DVDDI VBAT. them simultaneously.
Note: When "High" VBAT/DVDDI supply suddenly unexpected event, noise detected while sound signal being amplified. Under such cases will harmed. Power supply (VBAT, DVDDI) sequences follows.
VBAT DVDDI
Figure Power-Down Sequence Timing Diagram
///VBAT
DVDDI
Figure Power-Down Sequence Timing Diagram Attention: performance device will guaranteed after below sequence. VBAT="OFF" first, then DVDDI="OFF"
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Analog inputs AC-coupling capacitor required analog inputs. Recommended capacitance 0.1µF. This AC-coupling capacitance configures High-Pass-Filter, used configuration NOISE SUPPRESSOR well. Therefore, variation this capacitance affects both cut-off frequency NOISE SUPPRESSOR operation. Additional input filter applicable. When using filter analog input, place before AC-coupling capacitors.
Note frequency (fc) High-pass filter, used decoupling before input, caluculated equation, example, when Input impedance pins 50k(typ.) coupling capacitors 0.1µF, then frequency will 31.8Hz.
AK7844 internal Pre-Amplifier, which supports from -6dB +15dB(3dB/step) gain range. Pre-Amplifier gain adjusted PG0,PG1 like shown below.
"Low" "Low" "Low" "Low" "High" "High" "High" "High" "Low" "Low" "High" "High" "Low" "Low" "High" "High" "Low" "High" "Low" "High" "Low" "High" "Low" "High" Gain Setting Value -6dB -3dB +3dB +6dB +9dB +12dB +15dB
Table. Gain Setting
Class-D Class-D architecture features higher efficiency power consumption operation. filter-less solution offers Class-AB performance with Class-D efficiency minimal board space. Noise Suppressor AK7844 features extensive noise suppression circuitry. Power Booster Built-in BOOST DCDC CONVERTER generates adequate high voltage Piezo-Speaker. Input voltage range corresponds with Li-Ion battery voltage range (2.7V 4.5V), output voltage 8.75V. Normally, output connected supply VDD1 VDD2 Class-D operation. Lowpass Filter AK7844 built-in Lowpass Filter input side. Cutoff frequency adjusted follows. must connected either ground (VSS4) DVDDI. CurOff Frequency "Low" "Low" 16kHz "Low" "High" 8kHz "High" "Low" 4kHz "High" "High" 4kHz Table. Adjustable Cutoff Frequency Lowpass filter
Protection
AK7844 supports following protection circuits protecting against damages.
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Output Short-Circuit Protection case detecting VCL(R)P VCL(R)N short, AK7844 clamps peak current Class-D output circuit without shutting down outputs. Over-Temperature Protection AK7844 designed shutdown +150°C inside temperature that protected from heat damage. Note that AK7844 DOES support resume function from Over-Temperature Protection. Once activated, AK7844 does back normal operation unless "PDN" toggled ("L" "H"). Over-Current Protection Class-D amplifiers' current-limiting protection clamps output current without shutting down outputs. Over-Voltage Protection Boost DCDC Converter voltage-limiting function avoid destrying itself.
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Performance characteristics
following various characteristics typical characteristic data typical condition. necessarily secure characteristic description.
Sinwave Single Input, Total Gain=16.9dB, Measurement Band Frequency=2020kz, Cutoff Frequency=16kHz, unless otherwise specified.
VBAT=4.5V CL=1.0uF
VBAT=3.6V CL=1.0uF
Vout=4Vrms Vout=2Vrms THD+N
Vout=4Vrms
THD+N
Vout=2Vrms
Vout=1Vrms
Vout=1Vrms
0.01 Frequency (kHz)
0.01 Frequency (kHz)
VBAT=2.7V CL=1.0uF
Vout=4Vrms Vout=2Vrms
THD+N
Vout=1Vrms
0.01 Frequency (kHz)
Figure Total Harmonic Distortion Plus Noise Frequency
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
VBAT=4.5V CL=1.0uF
VBAT=3.6V CL=1.0uF
Fin=4kHz THD+N
Fin=4kHz
Fin=1kHz
THD+N
Fin=1kHz
Fin=10kHz
Fin=10kHz
0.01
0.01
Output Voltage (Vrms)
Output Voltage (Vrms)
VBAT=2.7V CL=1.0uF Fin=4kHz
Fin=1kHz
THD+N
Fin=10kHz
0.01
Output Voltage (Vrms)
Figure Total Harmonic Distortion Plus Noise Output Voltage
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
VBAT4.5V,3.6V,2.7V same characteristic
Vin=2Vpp CL=1.0uF
Gain (dB)
VBAT4.5V,3.6V,2.7V same characteristic
VBAT=4.5V VBAT=3.6V
Vout=2Vrms CL=1.0uF
VBAT=3.6V VBAT=4.5V VBAT=2.7V
Output Voltage (Vrms)
VBAT=2.7V
0.01
Frequency (kHz)
Frequency (kHz)
Figure Output Amplitude Frequency Frequency Response
Supply Current Stereo (mA)
Fin=1kHz CL=1.0uF
VBAT=3.6V VBAT=2.7V
VBAT+0.2Vpp CL=1.0uF
PSRR (dB)
VBAT=2.7V
VBAT=4.5V
VBAT=3.6V VBAT=4.5V
0.01
Output Voltage (Vrms)
Frequency (kHz)
Figure Supply Current Output Voltage Supply Ripple Rejection Ratio Frequency
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Supply Current Stereo (mA)
CL=1.0uF Input
Shutdown Current (nA) CL=1.0uF
Supply Voltage
Supply Voltage
Figure "Supply Current Supply Voltage" "Shutdown Current Supply Voltage"
2V/div
2V/div
Output Waveform 10V/div 10ms/div
Output Waveform 10V/div 10ms/div
Figure "Startup Waveform" "Shutdown Waveform"
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Power Supply Input 217Hz Duty Input open CL=1.0uF
Power Supply Input 217Hz Duty Input open CL=1.0uF
PSRR FREQUENCY FFT[dB] -100 -120 -140 1000 1500 Frequency[Hz] VBAT 2000 2500
Figure "GSM PSRR TIME" "GSM PSRR Frequency"
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
LEVEL DIAGRAM gain AK7844 determined Pre-Amplifier, Class-D Amp, Total gain will +16.9dB while Pre-Amplifier default setting (PG=0). gain Class-D gain changeable. Figure shows level diagram example, PG=0dB PG=+15dB.
-3dB +15dB step
+6dB
Class-D +10.9dB
VCxN VCxP
[dBV]
0dBV 1Vrms
1kHz
Class-D maximum output with load 5.0Vrms Output 13.9dBV (5.0Vrms)
+10.9dB
+6.02dB Input -3.01dBV (0.70Vrms) *Pre Gain Input path Limit -3.01dBV -3.01dBV (0.70Vrms) 3.01dBV (0.70Vrms)
+15dB
Input -18.01dBV (0.126Vrms) *Pre Gain +15dB
Figure Level Diagram *1Vrms=0dBV=2.83Vpp (sin wave)
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
TYPICAL APPLICATION CIRCUIT
Li-ion Battery DVDDI Gain ERRO VBAT VCOIL VSS3 VDD1 VCLN
ClassD
Piezo Speaker
Boost DCDC
VCLP VSS1 VSS4 VDD2
Gain VREF
VCLN
Class-D
Piezo Speaker
VCLP VSS2
Figure AK7844 Application Schematic Recommended external components shown Table. Reference Type Value Manufacturer Part Size (mm) CoilCraft LPS3010-102ML 2.95 Inductor 1.0uF TFC252008MC-1R0 Diode (30V, SANYO SS1003EJ Schottky GRM319B31C106K Capacitor 10µF Murata Ceramic GRM155B11E103KA01D 10050.50 Capacitor 0.01µF Murata Ceramic Capacitor 0.1µF GRM155B11A104KA01D 10050.50 Murata Ceramic GRM188B31A225KE33D 16080.80 Capacitor 0.1µF Murata Ceramic Table. External Recommendation Parts Chose inductors Table. Selection very important because they affect DCDC converter paformance directly. stability operation, recommends them described Table.
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Grounding Power Supply Decoupling AK7844 requires careful attention power supply grounding arrangements. VBAT usually supplied from Li-Ion battery system. VDD1 VDD2 supplied from smoothed boosted voltage. VSS1, VSS2, VSS3 VSS4 must connected analog ground plane. Analog digital ground system should connected together near where supplies brought onto printed circuit board. Decoupling capacitors with small value ceramic (C7,C8) should close AK7844 possible. Voltage Reference signal ground this device. 0.01µF ceramic capacitor (C3) between VSS4 eliminates effects high frequency noise. This capacitor should close possible. take load current from pin. signals, especially clocks should kept away from order avoid unwanted coupling. Class-D analog Inputs AC-coupling capacitors necessary series respectively. Class-D Outputs Class-D outputs signal format. Locate outputs close speaker minimize interconnect resistance capacitance suppress noise. Match length pattern plus minus output interconnect. Keep AK7844 Class-D outputs away away possible from devices such antennas that sensitive high frequency noise. Effect bands Power Booster Class-D Outputs affect high frequency signal outside AK7844. Apply previous section Class-D Outputs) layout. Drivable Piezo Speakers AK7844 designed drive typical piezo speakers some cases electric characteristics speakers differ manufacturers. Feel free whether your speakers driven before using them. Boost DCDC Converter Ceramic capacitor (C1, C9), Inductance (L1) Schottky Diode (D1) should located close AK7844 possible.
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
PACKAGE MARKING
AK7844
XXXX
XXXX Date code digit)
31pin WL-CSP Package Outline (Unit
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
IMPORTANT NOTICE These products their specifications subject change without notice. Before considering application, consult Asahi Kasei Microsystems Co., Ltd. (AKM) sales office authorized distributor concerning their current status. assumes liability infringement patent, intellectual property, other right application information contained herein. export these products, devices systems containing them, require export license other official approval under regulations country export pertaining customs tariffs, currency exchange, strategic materials. products neither intended authorized critical components safety, life support, other hazard related device system, assumes responsibility relating such use, except with express written consent Representative Director AKM. used here: hazard related device system designed intended life support maintenance safety applications medicine, aerospace, nuclear energy, other fields, which failure function perform reasonably expected result loss life significant injury damage person property. critical component whose failure function perform reasonably expected result, whether directly indirectly, loss safety effectiveness device system containing which must therefore meet very high standards performance reliability. responsibility buyer distributor product distributes, disposes otherwise places product with third party notify that party advance above content conditions, buyer distributor agrees assume responsibility liability hold harmless from claims arising from said product absence such notification.
Rev.01
2007/08
ASAHI KASEI
CONFIDENTIAL
[AK7844]
Revision History
Date (YY/MM/DD) 07/08/07 07/09/13 Revision Reason addition Page 11-15 Contents First edition English TYPICAL CHARACTERISTICS
Rev.01
2007/08

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