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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 21

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VBAT = 1.8V; no load;

HIQ_EN_MICS_LDO = 0

0.33

VBAT = 1.4V; no load;

HIQ_EN_MICS_LDO = 0

0.32

IMICS_CP

Current

consumption

microphone supply

charge pump

VBAT= 1.8V; MICS voltage

regulator off; no load

0.3

VBAT= 1.8V; MICS voltage

regulator off; 1mA load

3.5

VBAT= 1.4V; MICS voltage

regulator off; no load

0.26

VBAT= 1.4V; MICS voltage

regulator off; 1mA load

3.33

IOUT

Output current

Charge pump activated

Figure 19:

Microphone Supply Load Characteristic

6.4

Headphone Amplifier

The headphone amplifier is a true ground output using VNEG as negative supply. It is designed to

feature an output power of 2x34mW @ 32

Ωload. For higher output requirements, the headphone

amplifier is also capable of operating in bridged mode. In this mode the left output is carrying the

inverted signal of the right output shown in Figure 21. With a VBAT voltage of 1.8V, a maximum output

power of 100mW can be achieved. This is necessary for over- and on ear headsets with higher output

power requirements. The amplifier itself features various input sources. The line input signal is directly

connected to the headphone amplifier. The input multiplexer supports three different input signals

load [mA]

VBAT=1,4V

VBAT=1.8V

AS3418 Datasheet(PDF) 21 Page - ams AG

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