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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 20

Figure 17:

Microphone Supply

The microphone supply charge pump is also used to switch off the integrated music bypass switch of

the AS3418 in active mode. Therefore, during normal operation the microphone supply must not be

switched off if the BPL and BPR pins are in use.

6.3.1

Parameter

VBAT=1.8V, TA= 25ºC, CMSUP = 4.7µF and CMICS = 4.7µF unless otherwise specified.

Figure 18:

Microphone Supply Parameter

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VMICS

Microphone supply

LDO output voltage

VBAT= 1.8V; no load; charge

pump activated

2.9

VBAT=1.4V; no load; charge

pump activated

2.5

VMSUP

Microphone supply

charge pump

output voltage

VBAT= 1.8V; no load; MICS

voltage regulator off

3.15

VBAT= 1.4V; no load; MICS

voltage regulator off

2.7

VNoise-A

Microphone Supply

Noise at MICS

output

High quality mode enabled; 1mA

load; A-weighted

1.7

µV

High quality mode disabled;

1mA load; A-weighted

2.2

µV

IMICS

Current

consumption low

noise voltage

regulator

VBAT = 1.8V; no load;

HIQ_EN_MICS_LDO = 1

0.69

VBAT = 1.4V; no load;

HIQ_EN_MICS_LDO = 1

0.67

CMSUP

MIC

Charge

Pump

VBAT

MICS

to microphone

BIAS resistors

CMICS

LDO

ANCMON_

MICS_ON

ANCMON_MICS_CP_ON

ANCM ON_MICS_CP_BYP_EN

M ICS_V_SEL<3:0>

M ICS_V_LEV<3:0>

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