an12976a Panasonic Corporation of North America, an12976a Datasheet - Page 4

• Manufacturer Part Number: an12976a
• Description: Headphone Amplifier Ic With Charge Pump
• Manufacturer: Panasonic Corporation of North America

AN12976A
Truth table for control pins
Notes)
Notes) *1 : Although output state is the same as that of standby mode, VCC current of about 10 μA flows.
High and Low levels guaranteed voltage for control pins
STANDBY
STANDBY
Application Circuit Example (Block Diagram)
HPCTRL
(Pin A4)
High
High
Low
Low
*2 : This mode is that only charge pump operates and headphone output is turned OFF.
This application circuit is shown as an example but does not guarantee the design for mass production set.
This block diagram is for explaining functions. The part of the block diagram may be omitted, or it may be simplified.
Use standby mode on the condition of STANDBY = Low, HPCTRL = Low as wherever possible.
VCC = 3.0 V
1.7 V or more
1.7 V or more
HPCTRL
HPCTRL
(Pin B1)
HPLIN
33 Ω
High
High
Low
Low
High-level
1 μF
HPLOUT
HPCTRL
HPLIN
1 μF
VCC
Standby mode
Use is prohibited
Headphone save mode
Normal operation
VCCPUMP
C1
33 Ω
D2
D1
B1
Operation mode
0.3 V or less
0.3 V or less
GND
1 μF
C2
A1
Low-level
CP1
SUB
C3
A2
HPROUT
*1
*2
Ver. AEB
GND
PUMP
D3
Charge
Pump
REG
B2
1 μF
AN12976A
CP2
A3
GND
D4
A4 STANDBY
C4 HPRIN
B3
VSS
1 μF
1 μF
HPRIN
STANDBY
4