AK7841 Datasheet, PDF (4/21 Pages) Asahi Kasei Microsystems – Monaural Audio Class-D Amp with Power Booster for PiezoSpeaker

ASAHI KASEI
[AK7841]
Pin / FUNCTION
No.
Pin Name
I/O Function
A1
NC
-
No Connection pin. * Must be connected to VSS level.
A2
-
<Index>
A3
DVDDI
-
Digital interface power：DVDDI=1.65V ∼ 4.5V
A4
PG1
I
Pre Gain setting pin1
A5
NC
-
No Connection pin. * Must be tied to VSS level during normal usage.
B1
INP
I
Positive analog input while differential-ended.
OPEN while single-ended input.
B2
INN
I
Negative analog input while differential-ended.
Analog input while single-ended.
B3
PDN
I
Power down contorol：schmitt trigger input
“High”：poewer up、”Low”：power down
B4
PG0
I
Pre Gain setting pin0
B5
PG2
I
Pre Gain setting pin2
C1
VC
O
Voltage reference output
* Connect 0.01µF capacitor in between VC and ground.
C2
VSS3
-
Internal analog circuit ground pin：VSS3=0V
C3
NC
-
No Connection pin. * Must be connected to VSS level.
C4
VBAT
-
Battery voltage input：VBAT=2.7V ∼ 4.5V
C5
ERRO
O
Phase compensation for Boost DCDC.
* Connect 0.1µF capacitor in between ERRO and ground.
D1
VSS1
-
Class D amp ground pin ：VSS1=0V
D2
VCN
O Class D amp negative output (-)
D3
SDSEL
I
single-end／differential input setting pin
“High” : single-end “Low”: differential input
D4
VSS2
-
Power Booster ground pin： VSS2=0V
D5
VCOIL
O Inductor pin for Boost DCDC.
E1
NC
-
No Connection pin. * Must be connected to VSS level.
E2
VCP
O Class D amp positive output (+)
E3
VDD1
-
Class D amp power supply ：VDD1=8.75V(typ.)
E4
VFB
I
Power Booster feedback
E5
NC
-
No Connection pin. * Must be connected to VSS level.
Note 1. Digital input pins (PDN, PG0, PG1, PG2, TEST1, TEST2) and NC pins must not be open.
„ Un-used Pins
Un-used pin must be configured as follows.
Analog
Pin Name
INP
Configuration
OPEN
Rev.08
2008/3
-4-