|
|
PDF AK7844 Data sheet ( Hoja de datos )
| Número de pieza | AK7844 | |
| Descripción | Stereo Audio Class-D Amp | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AK7844 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
|
No Preview Available !
AKEMD
AKEMD CONFIDENTIAL
www.D[aAtaKSh7ee8t44U4.c]om
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-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
• Built-in Second order lowpass filter at Input.
• Cutoff Frequency (4kHz,8kHz,16kHz)
• Power-on/off control
• Over-temperature protection
* Adjustable by Pin (PG0, PG1 and PG2) control
* Adjustable by Pin (PG0, PG1 and PG2) control
□ 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)
Rev.00
－1–
2007/08
1 page  
ASAHI KASEI
AKM CONFIDENTIAL
www.D[aAtaKSh7ee8t44U4.c]om
ABSOLUTE MAXIMUM RATINGS
(VSS1, VSS2, VSS3,VSS4=0V;Note 3)
Parameter
Symbol
min
max
Power Supplies: Battery
VBAT
−0.3
6.5
(Note.4)
Digital I/F
DVDDI
−0.3
6.5
Class-D Amp
VDD1,2
−0.3
15
Input Current, Any Pin Except Supplies
IIN -10
+10
Analog Input Voltage (Note 4) (Note 6)
VINA
−0.3
VBAT+0.3
Digital Input Voltage (Note 5) (Note 6)
VIND
−0.3
DVDDI+0.3
Ambient Temperature (powered applied)
Ta −30
85
Storage Temperature
Tstg −65
150
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.
Units
V
V
V
mA
V
V
°C
°C
RECOMMENDED OPERATING CONDITIONS
(VSS1, VSS2, VSS3, VSS4=0V; Note 2)
Parameter
Symbol min
typ
Power
Supplies
Battery (Note 7) VBAT 2.7
3.6
VDD (Note 8) VDDx TBD
8.75
DigitalI/F(Note 7) DVDDI 1.65
2.8
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.
max
4.5
TBD
4.5
* 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
High-Level Input Voltage1 (Note 9)
VIH1 70%DVDDI -
Low-Level Input Voltage1 (Note 9)
VIL1 -
-
High-Level Input Voltage2 (Note 10)
VIH2 80%DVDDI -
Low-Level Input Voltage2 (Note 10)
VIL2 -
-
Input Leakage CurrentI
Note 9. Applied to PG0, PG1, PG2.
Note 10. Applied to PDN, FC1, FC2 (Summit trigger input).
Units
V
V
V
max
-
30%DVDDI
-
20%DVDDI
±10
Units
V
V
V
V
µA
Rev.01
－5–
2007/08
5 Page 
ASAHI KASEI
AKM CONFIDENTIAL
www.D[aAtaKSh7ee8t44U4.c]om
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
VBAT=4.5V
CL=1.0uF
1 Vout=4Vrms
0.1
Vout=2Vrms
Vout=1Vrms
10
VBAT=3.6V
CL=1.0uF
1 Vout=4Vrms
0.1 Vout=1Vrms
Vout=2Vrms
0.01
0.1
1 10
Frequency (kHz)
0.01
100 0.1
1 10
Frequency (kHz)
10
VBAT=2.7V
CL=1.0uF
Vout=4Vrms
1
Vout=2Vrms
0.1
Vout=1Vrms
0.01
0.1
1 10
Frequency (kHz)
100
Figure 7. Total Harmonic Distortion Plus Noise vs. Frequency
100
Rev.01
－ 11 –
2007/08
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AK7844.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AK7841 | Monaural Audio Class-D Amp | Asahi Kasei Microsystems |
| AK7844 | Stereo Audio Class-D Amp | Asahi Kasei Microsystems |
| AK7846 | Stereo Audio Class-D Amp | Asahi Kasei Microsystems |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |