AKEMD AKEMD CONFIDENTIAL [AK7844]
AK7844
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-power- consumption 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 * Adjustable by Pin (PG0, PG1 and PG2) control • Built-in Second order lowpass filter at Input.
• Cutoff Frequency (4kHz,8kHz,16kHz) * Adjustable by Pin (PG0, PG1 and PG2) control • Power-on/off control
• Over-temperature protection
□ Operational voltage ： VBAT=2.7V ∼ 4.5V、DVDDI=1.65V ∼ 4.5V
□ Operational temperature ： −30°C ∼ 85°C
□ Package ： 31pin WL-CSP (3.0mm × 3.0mm, 0.5mm pitch)
Stereo Audio Class-D Amp with Power Booster for Piezo Speakers
Rev.00 － 1 – 2007/08
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AKEMD AKEMD CONFIDENTIAL [AK7844]
BLOCK DIAGRAM
FC１ VBAT
FC0 VCOIL PG2 Power Booster VFB PG1 ERRO PG0 DVDDI VSS3
PDN VDD1
INL
Pre GainL LPF L Class-DVCLN AMP L VCLP Fc: VSS1
4/8/16kHz -6 ～ +15dB3dB step VSS4 VDD2 VCRN INR
Pre GainRLPF R Class-DAMP R VCRP VC VREFVSS2
Figure 1. BLOCK DIAGRAM
Rev.00 － 2 – 2007/08
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AKEMD AKEMD CONFIDENTIAL [AK7844]
PIN ASSIGNMENT
A D B C E F
6
5
4
３.0ｍｍ
3
2
1
0.25 0.5 0.25 - 6 5 4 3 2 1 A B C D E F NC VDD2 VFB NC VDD1 NC VCRP VCRN NC NC VCLN VCLP ERRO VSS2 － VSS1 INL － PG2 VSS4 － VBAT INR － VCOIL VSS3 PG1 FC1 FC0 VC NC Rev.00 － 3 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Pin / FUNCTION Function No Connection pin. Connect to ground. Inductor pin for Boost DCDC. Pre Gain setting pin2 (available when I2CEN=”L”) Phase compensation capacitor connection pin for Boost DCDC. A4 ERRO Connect a 0.1µF capacitor between VC pin and ground. A5 VCRP O Right channel Class D amp plus output (+) A6 NC No Connection pin. Connect to ground. B1 － － No Connection pin. Connect to ground. D5 NC No Connection pin. Connect to ground. D6 NC Power down contorol：schmitt trigger input E1 PDN I “High”：poewer up、”Low”：power down E2 FC0 I SCF cutoff frequency setting pin2 Battery voltage input：VBAT=2.7V～4.5V E3 VBAT － Left channel Class D amp ground pin：VSS1=0V E4 VSS1 － E5 VCLN O Left channel Class D amp minus output (-) Left channel Class D amp power supply：VDD1=8.75V(typ.) E6 VDD1 F1 NC No Connection pin. Connect to ground. Voltage reference output. Connect a 0.01µF capacitor between VC pin and ground. F2 VC F3 INR I Right channel analog signal input F4 INL I Left channel analog signal input F5 VCLP O Left channel Class D amp plus output (+) F6 NC No Connection pin. Connect to ground. Note 1. Digital input pins (PDN, PG2, PG1, PG0, FC1, FC0) must not be open. Unused Pins Unused pins should be configured as below. Category Pin Name Configuration NoConnection NC GND No. Pin Name A1 NC A2 VCOIL A3 PG2 I/O － － I Rev.01 － 4 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] ABSOLUTE MAXIMUM RATINGS (VSS1, VSS2, VSS3,VSS4=0V;Note 3) Parameter Symbol min max Units Power Supplies: Battery VBAT −0.3 6.5 V (Note.4) Digital I/F DVDDI −0.3 6.5 V Class-D Amp VDD1,2 −0.3 15 V Input Current, Any Pin Except Supplies IIN -10 +10 mA Analog Input Voltage (Note 4) (Note 6) VINA −0.3 VBAT+0.3 V Digital Input Voltage (Note 5) (Note 6) VIND −0.3 DVDDI+0.3 V Ambient Temperature (powered applied) Ta −30 85 °C Storage Temperature Tstg −65 150 °C Note 2. All voltages are with respect to ground. Note 3. VSS1, VSS2, VSS3, VSS4 pin must be connected to the same analog ground plane. Note 4. INL,INR pin Note 5. PDN, PG2, PG1, PG0, FC1, FC0 pin Note 6. Maximum value must not exceed 6.5V even if VBAT or DVDDI is more than 6.2V. WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. RECOMMENDED OPERATING CONDITIONS (VSS1, VSS2, VSS3, VSS4=0V; Note 2) Parameter Symbol min typ max Units Power Battery (Note 7) VBAT 2.7 3.6 4.5 V Supplies VDD (Note 8) VDDx TBD 8.75 TBD V DigitalI/F(Note 7) DVDDI 1.65 2.8 4.5 V Note 2. All voltages are with respect to ground. Note 7. Should sustain “VBAT≧ DVDDI” condition Note 8. Supply with boosted voltage (typ. 8.75V) by the Power Booster. * AKM assumes no responsibility for usage beyond the conditions in this datasheet. DC CHARACTERISTICS (Ta=25°C; VBAT=2.7 ∼ 4.5V,DVDDI = 1.65～4.5V,VSS1=VSS2=VSS3=VSS4=0V) Parameter Symbol min typ max Units High-Level Input Voltage1 (Note 9) VIH1 70%DVDDI - - V Low-Level Input Voltage1 (Note 9) VIL1 - - 30%DVDDI V High-Level Input Voltage2 (Note 10) VIH2 80%DVDDI - - V Low-Level Input Voltage2 (Note 10) VIL2 - - 20%DVDDI V Input Leakage CurrentI ±10 µA Note 9. Applied to PG0, PG1, PG2. Note 10. Applied to PDN, FC1, FC2 (Summit trigger input). Rev.01 － 5 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] ANALOG CHARACTERISTICS (Unless otherwise noted, Ta＝25℃、VBAT=3.6Ｖ、DVDDI=2.8V、VSS1,2,3,4＝0V, Input Signal Frequency =1kHz , Measurement Band Width =20～20kHz ,PreGain=0dB , Fc= 16kHz Class-D ampu Output Load Impedance ZL=1.0uF) Parameter Condition min typ max Units No input signal. Idd T.B.D mA With output Load ShutdownCurrent PDN pin = ”Low” 1.0 10 μA Input Impedance PreGain Control Range INL 25 50 75 kΩ INR 25 50 75 kΩ -6 +15 dB PG2=”Low”,PG1=” Low”,PG0=” Low” -7 -6 -5 dB PG2=”Low”,PG1=” Low”,PG0=” High” -4 -3 -2 dB PG2=”Low”,PG1=” High”,PG0=” Low” -1 0 +1 dB PG2=”Low”,PG1=” High”,PG0=” High” +2 +3 +4 dB PG2=” High”,PG1=” Low”,PG0=” Low” +5 +6 +7 dB PG2=” High”,PG1=” Low”,PG0=” High” +8 +9 +10 dB PG2=” High”,PG1=” High”,PG0=” Low” +11 +12 +13 dB PG2=” High”,PG1=” High”,PG0=” High” +14 +15 +16 dB VCL(R)P/VCL(R)N TBD 5.0 TBD Vrms Input Signal=0.7Vrms VCL(R)P/VCL(R)N - - T.B.D. mV No input signal VCL(R)P/VCL(R)N (Note 12) - - -30 dB Input Signal=0.5Vrms VCL(R)P/VCL(R)N (Note 12) Input Signal=0.7Vrms 70 80 - dB using an A wating filter. VCL(R)P/VCL(R)N (Note 12) 50 Vripple=200mVpp@1kHz sinwave INL：NoInput 、INR=2Vpp 70 dB Lch：OutputPin monitoring. INR：NoInput 、INL=2Vpp 70 dB Rch：OutputPin monitoring. Class-D Amp 225 250 275 kHz PowerBooster 900 1000 1100 C3=0.01uF, C5=C6= 0.1uF(Note 15) 28 ms VBAT=2.7V PreGain Step Size (Note 11) Output Voltage Output Offset Voltage THD+N SNR PSRR (Note 13) Cross Talk Switching Frequency Startup Time (Note 14) Note 11. Setting accuracy of each setting is within ±1dB. Monotony is guaranteed. Note 12. Measure signals between VCL(R)N and VC L(R)P through Low-Pass-Filter (fc=20kHz). Note 13. 200mVpp@1kHz superimposed signal at VBAT pin, .and measured output. Note 14. Time period from “PDN” turns “High” to stability operation. Note 15. Refer to section “TYPICAL APPLICATION CIRCUIT”. Rev.01 － 6 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] OPERATION OVERVIEW Power Control Once PDN pin is set to “Low”, all circuit will stop and AK7844 will shut down. It resumes and outputs stable signal in (TBD)ms after PDN is set to “High”. Power-Up Sequence VBAT and DVDDI must be turned on as (1) or (2) below. (1) VBAT=DVDDI=”ON” at the same time. (2) VBAT=”ON” first, then DVDDI=”ON”. Set PDN pin to “High” when power-on. Then, PDN must be delayed at least 1us after DVDDI is set to High. Do not do them simultaneously. VBAT DVDDI PDN pin > 1us Figure 3. Power-Up Sequence (1) Timing Diagram VBAT DVDDI PDN pin > 0> 1us Figure 4. Power-Up Sequence (2) Timing Diagram Attention: The performance of the device will not be guaranteed after the below sequence. (3) DVDDI=”ON” first, then VBAT=”ON”. Rev.01 － 7 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Power-Down Sequence VBAT and DVDDI must be turned off as (4) or (5) below. (4) VBAT=DVDDI=”OFF” at the same time. (5) DVDDI=”OFF” first, then VBAT=”OFF”. Set PDN pin to “Low” when shutdown. Then, 1µs wait is necessary before stopping power supply, DVDDI and VBAT. Do not do them simultaneously. Note: When PDN pin is “High” and VBAT/DVDDI supply is suddenly cut off due to unexpected event, pop noise may be detected while sound signal is being amplified. Under such cases LSI will not be harmed. Power supply (VBAT, DVDDI) sequences are as follows. VBAT DVDDI > 1us PDN pin Figure 5. Power-Down Sequence (4) Timing Diagram /// VBAT > 0DVDDI > 1usPDN pin Figure 6. Power-Down Sequence (5) Timing Diagram Attention: The performance of the device will not be guaranteed after the below sequence. (6) VBAT=”OFF” first, then DVDDI=”OFF” Rev.01 － 8 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Analog inputs AC-coupling capacitor is required at analog inputs. Recommended capacitance is 0.1µF. This AC-coupling capacitance configures High-Pass-Filter, and used to configuration of POP NOISE SUPPRESSOR as well. Therefore, any variation of this capacitance affects both HPF cut-off frequency and POP NOISE SUPPRESSOR operation. Additional input filter is applicable. When using filter at analog input, place it before AC-coupling capacitors. Note 16. Cut off frequency (fc) of the High-pass filter, used as decoupling before input, is caluculated by an equation, 1 / (2 × π × R × C). For example, when Input impedance of INN and INP pins are 50kΩ(typ.) and AC coupling capacitors are 0.1µF, then the cut off frequency will be 31.8Hz. Pre AMP THE AK7844 has internal Pre-Amplifier, which supports from −6dB to +15dB(3dB/step) gain range. Pre-Amplifier gain is adjusted by PG0,PG1 and PG2 like as shown below. PG2 PG1 PG0 Pre Gain Setting Value “Low” “Low” “Low” −6dB “Low” “Low” “High” -3dB “Low” “High” “Low” 0dB “Low” “High” “High” +3dB “High” “Low” “Low” +6dB “High” “Low” “High” +9dB “High” “High” “Low” +12dB “High” “High” “High” +15dB Table. 1 Pre Gain Setting Class-D AMP Class-D architecture features higher efficiency and low power consumption operation. AKM filter-less solution offers Class-AB performance with Class-D efficiency and minimal board space. Pop Noise Suppressor The AK7844 features extensive pop noise suppression circuitry. Power Booster Built-in BOOST DCDC CONVERTER generates adequate high voltage for Piezo-Speaker. Input voltage range corresponds with Li-Ion battery voltage range (2.7V ~ 4.5V), and output voltage is 8.75V. Normally, output connected to and supply VDD1 and VDD2 for Class-D operation. Lowpass Filter The AK7844 has a built-in Lowpass Filter at the input side. Cutoff frequency can be adjusted by FC0 and FC1 as follows. FC0 and FC1 must be connected to either ground (VSS4) or DVDDI. FC1 FC0 CurOff Frequency “Low” “Low” 16kHz “Low” “High” 8kHz “High” “Low” 4kHz “High” “High” 4kHz Table. 2 Adjustable Cutoff Frequency of Lowpass filter Protection The AK7844 supports following protection circuits for protecting against any damages. Rev.01 － 9 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Output Short-Circuit Protection In case of detecting VCL(R)P and VCL(R)N short, the AK7844 clamps peak current of Class-D output circuit without shutting down the outputs. Over-Temperature Protection The AK7844 is designed to shutdown at +150°C of inside temperature so that it can be protected from heat damage. Note that the AK7844 DOES NOT support resume function from Over-Temperature Protection. Once it is activated, the AK7844 does not back in normal operation unless “PDN” is toggled (“L” Æ “H”). Over-Current Protection Class-D amplifiers’ current-limiting protection clamps the output current without shutting down the outputs. Over-Voltage Protection Boost DCDC Converter has the voltage-limiting function to avoid destrying itself. Rev.01 － 10 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Performance characteristics ※ The following various characteristics are typical characteristic data in the typical condition. It is not the one necessarily to secure the characteristic of the description. Sinwave Single Input, Total Gain=16.9dB, Measurement Band Frequency=20～20kz, Cutoff Frequency=16kHz, unless otherwise specified. 10 10VBAT=4.5VVBAT=3.6V CL=1.0uFCL=1.0uF Vout=4VrmsVout=4Vrms11 Vout=2VrmsVout=2Vrms Vout=1Vrms0.10.1Vout=1Vrms 0.010.01 1101000.1110100 0.1 Frequency (kHz)Frequency (kHz) 10VBAT=2.7V CL=1.0uF Vout=4Vrms 1 Vout=2Vrms 0.1Vout=1Vrms 0.01 110100 0.1Frequency (kHz) Figure 7. Total Harmonic Distortion Plus Noise vs. Frequency Rev.01 － 11 – 2007/08 THD+N (%)THD+N (%)THD+N (%)元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] 1010VBAT=4.5VVBAT=3.6V CL=1.0uFCL=1.0uF 1Fin=4kHzFin=4kHz 1 Fin=1kHz 0.10.1Fin=10kHz Fin=10kHz 0.01 0.01 0123450123 Output Voltage (Vrms)Output Voltage (Vrms) 10VBAT=2.7V CL=1.0uF Fin=4kHzFin=1kHz 1 0.1 Fin=10kHz 0.01 012345 Output Voltage (Vrms) Figure 8. Total Harmonic Distortion Plus Noise vs. Output Voltage THD+N (%)Fin=1kHzTHD+N (%)45THD+N (%) Rev.01 － 12 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] ※）VBAT＝4.5V,3.6V,2.7V The all same characteristic※）VBAT＝4.5V,3.6V,2.7V The all same characteristic18 6Vout=2VrmsVin=2Vpp VBAT=3.6VCL=1.0uFC=1.0uFL16 VBAT=4.5V5 14VBAT=4.5V VBAT=3.6V 124VBAT=2.7V VBAT=2.7V 10 3 8 26 4 12 0 00.11101000.1110100 0.01 Frequency (kHz)Frequency (kHz) Figure 9. ” Output Amplitude vs. Frequency ” & “ Frequency Response ” 350-20 VBAT+0.2VppFin=1kHz CL=1.0uFCL=1.0uFVBAT=3.6V 300 VBAT=2.7V -30250 VBAT=2.7V 200 -40 150 100 VBAT=4.5V-50 VBAT=3.6VVBAT=4.5V 50 0-60012345 0.010.1110100 Output Voltage (Vrms)Frequency (kHz) Figure 10. “ Supply Current vs. Output Voltage ” & “ Supply Ripple Rejection Ratio vs Frequency ” PSRR (dB)Gain (dB)Supply Current @ Stereo (mA)Output Voltage (Vrms) Rev.01 － 13 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] 20CL=1.0uF 18No Input 18 1616 1414 12 12 1010 88 66 44 22 002.633.43.84.24.6 2.633.43.84.24.6 Supply Voltage (V)Supply Voltage (V) Figure 11. “Supply Current vs. Supply Voltage” & “Shutdown Current vs. Supply Voltage” PDN 2V/div PDN 2V/div Output Waveform Output Waveform 10V/div 10V/div 10ms/div10ms/div Figure 12. “Startup Waveform” & “Shutdown Waveform” 20CL=1.0uFSupply Current @ Stereo (mA) Rev.01 － 14 – 2007/08 Shutdown Current (nA)元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Power Supply Input : 217Hz Duty 12% Power Supply Input : 217Hz Duty 12% Input pin : AC open Input pin : AC open CL=1.0uF CL=1.0uF GSM PSRR vs FREQUENCY 0 -20 -40 -60 -80 -100 -120 -140 050010001500Frequency[Hz] VBATLchRch Figure 13. “GSM PSRR vs TIME” & “GSM PSRR vs Frequency” FFT[dB]20002500 Rev.01 － 15 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] LEVEL DIAGRAM The gain of AK7844 are determined by Pre-Amplifier, LPF and Class-D Amp, Total gain will be +16.9dB while Pre-Amplifier is default setting (PG=0). LPF gain and Class-D Amp gain are not changeable. Figure 14 shows level diagram of two example, PG=0dB and PG=+15dB. INxPreAMP-3dB to +15dB3dB stepLPF+6dB Class-D AMP+10.9dBVCxNVCxP[dBV]25 0dBV = 1Vrms1kHz20 Class-D AMP maximum outputwith 1uF load : 5.0VrmsOutput : 13.9dBV (5.0Vrms)15 10 +10.9dB5 +6.02dB Input (1) : -3.01dBV (0.70Vrms) *Pre Gain = 0dBInput path Limit : -3.01dBV0dB-3.01dBV (0.70Vrms)3.01dBV (0.70Vrms)0 - 5 - 10 +15dB- 15 Input (2) : -18.01dBV (0.126Vrms) *Pre Gain = +15dB- 20 Figure 14. Level Diagram *1Vrms=0dBV=2.83Vpp (sin wave) Rev.01 － 16 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] TYPICAL APPLICATION CIRCUIT Li-ion Battery C4 DVDDI FC1 FC0 PG2 PG1 PG0 PreGainERRO PDN VFBC9VBATVCOILVSS3VDD1VCLN C5 INL LPF ClassD L Piezo Speaker L1D1C1 Boost DCDC VCLP VSS1VSS4VDD2C7 C6 INR VC C3 Pre Gain VREF LPF VCLN Class-D R Piezo Speaker VCLP VSS2C8 Figure 15 AK7844 Application Schematic Recommended external components are shown in Table. 3. Reference Type Value ManufacturerPart No. Size (mm) CoilCraft LPS3010-102ML 2.95 ×2.95 ×0.9 L1 Inductor ※ 1.0uF TDK TFC252008MC-1R0 2.5 ×2.0 ×0.8 Diode (30V, SANYO SS1003EJ 1.6 × 0.8 × 0.6 D1 / Schottky 1A) GRM319B31C106K 3.2×1.6×0.85Capacitor 10µF / Murata C1 / Ceramic 25V GRM155B11E103KA01D 1005ｘ0.50 Capacitor 0.01µF / Murata C3 / Ceramic 16V C4, C5, C6, Capacitor 0.1µF / GRM155B11A104KA01D 1005ｘ0.50 Murata C7, C8 / Ceramic 16V GRM188B31A225KE33D 1608ｘ0.80 Capacitor 0.1µF / Murata C9 / Ceramic 25V Table. 3 External Recommendation Parts ※Chose one of inductors in Table. 3 Selection of L1, C1 and D1 are very important because they affect DCDC converter paformance directly. For stability operation, AKM recommends them described in Table. 3 Rev.01 － 17 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] 1. Grounding and Power Supply Decoupling The AK7844 requires careful attention to power supply and grounding arrangements. VBAT is usually supplied from Li-Ion battery in the system. VDD1 and VDD2 are supplied from smoothed boosted voltage. VSS1, VSS2, VSS3 and VSS4 must be connected to analog ground plane. Analog and digital ground in the system should be connected together near where the supplies are brought onto the printed circuit board. Decoupling capacitors with the small value ceramic (C7,C8) should be as close to the AK7844 as possible. 2. Voltage Reference VC is a signal ground of this device. A 0.01µF ceramic capacitor (C3) between VC and VSS4 pin eliminates the effects of high frequency noise. This capacitor should be as close to the VC pin as possible. Do not take out load current from the VC pin. All signals, especially clocks should be kept away from the VC pin in order to avoid unwanted coupling. 3. Class-D analog Inputs AC-coupling capacitors are necessary in series to INL and INR respectively. 4. Class-D Outputs The Class-D outputs are in BTL signal format. Locate the outputs close to the speaker to minimize interconnect resistance and capacitance to suppress noise. Match the length and pattern of the plus and minus output interconnect. Keep AK7844 or Class-D outputs away as far away as possible from the devices such as antennas that are sensitive to high frequency noise. 5. Effect on RF bands Power Booster or Class-D Outputs may affect high frequency signal outside the AK7844. Apply previous section (4. Class-D Outputs) in PCB layout. 6. Drivable Piezo Speakers The AK7844 is designed to drive typical piezo speakers but in some cases electric characteristics of the speakers differ by manufacturers. Feel free to ask us whether your speakers can be driven or not before using them. 7. Boost DCDC Converter Ceramic capacitor (C1, C9), Inductance (L1) and Schottky Diode (D1) should be located as close to the AK7844 as possible. Rev.01 － 18 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] PACKAGE ■ MARKING AK7844 XXXX 1 A XXXX : Date code (4 digit) ■ 31pin WL-CSP Package Outline (Unit : mm) Rev.01 － 19 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] IMPORTANT NOTICE These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification. Rev.01 － 20 – 2007/08 元器件交易网www.cecb2b.com ASAHI KASEI AKM CONFIDENTIAL [AK7844] Revision History Date (YY/MM/DD) Revision Reason PageContents 07/08/07 00 - First edition in English 07/09/13 01 addition 11-15TYPICAL CHARACTERISTICS Rev.01 － 21 – 2007/08 因篇幅问题不能全部显示，请点此查看更多更全内容