AK7841 Datasheet, PDF (17/21 Pages) Asahi Kasei Microsystems – Monaural Audio Class-D Amp with Power Booster for PiezoSpeaker

ASAHI KASEI
AKM CONFIDENTIAL
[AK7840]
Li-ion Battery
C1: 10uF
C5: 2.2uF
L1: 1.0uH
C2: 0.1uF
C6: 0.1uF
DVDDI
SDSEL
ERRO VFB VBAT
Power Booster
VCOIL
PDN
PG0
※ Refer to "Pre AMP" ^PG1
section for details.
PG2
PD
Cont
Gain
Cont
VSS2
VDD1
C8: 0.1uF
INN
INP
VSS2
C7: 0.01uF
VC
VSS3
Pre
AMP
VREF
Class-D
AMP
VCN
VCP
VSS1
D1
C4: 10uF
Piezo Speaker
C3: 0.1uF
Figure. 18 External Components Examples : Differential Input, direct Connection ※
※If two conditions are fulfilled as below, ac-coupling capacitors are not needed.
1. The voltage of INP and INN are VSS while shutting down.
2. The common level of INP and INN pin is between 0.8V and 1.6V, and input signals are within common
level±0.5V for each pin (2Vpp).
Rev.08
- 17 -
2008/3