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[v1-00] 2016-Apr-06

AS3412 − Detailed Description

VNEG Charge Pump

The VNEG charge pump uses one external 1μF ceramic capacitor

(CFLY) to generate a negative supply voltage out of the input

voltage to supply all audio related blocks. This allows a

true-ground headphone output with no need of external

DC-decoupling capacitors.

Figure 50:

VNEG Charge Pump

VNEG Charge Pump: This figure shows the block diagram of the VNEG charge pump that supplies all audio blocks

of the AS3412.

The charge pump typically requires an additional input

capacitor, CVBAT of 10μF and output capacitor, CVNEG, with the

same size as the input capacitor. The flying capacitor, CFLY,

should be 1μF.

Parameter

VBAT =1.8V, TA= 25ºC, unless otherwise specified.

Figure 51:

VNEG Charge Pump Parameter

VNEG Charge Pump Parameter: This table describes the electrical characteristics of the VNEG charge pump.

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VIN

Input voltage

VBAT

1.65

1.8

VOUT

Output voltage

VNEG

-1.45

-1.8

CFLY

External flying capacitor

μF

CVBAT

VBAT input capacitor

μF

CVNEG

VNEG output capacitor

μF

Charge Pump

Connection to audio blocks

VBAT

VNEG

CVNEG

10µF

CVBAT

10µF

CFLY

1µF

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