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AS3421 AS3422

Datasheet - A p p l i c a t i o n I n f o r m a t i o n

The layout examples showed in the examples before are based on AS3422. The AS3421 has of course a smaller package than AS3422,

therefore the alignment of the charge pump components is different. A layout recommendation for AS3421 is shown in Figure 45 below.

Figure 45. AS3421 CP Layout Recommendation

11.4 Bill of Materials

The following section shows the Bill of Materials which is necessary to operate the device. The necessary R-C filter networks which are

necessary for gain- and phase compensation are excluded. These components very much depend on the acoustic design of each headset. Both

devices basically need 17 external component for standard operation without the necessary filter components. The reference designator of the

components shown in Table 39 refer to the schematics shown in Figure 37 and Figure 41.

Table 39. AS3421/22 Bill of Materials

POS

Reference

Value/Name

Description

Count

AS3421

Stereo Bluetooth ANC headphone driver circuit

AS1363-AD

Low Drop Voltage Regulator

C3, C15

1 F

Charge Pump flying capacitor; +/- 10% tolerance and LDO support

C1, C6

100nF

PMU Blocking capacitors; +/- 10% tolerance

C7, C8, C9, C10

220nF

Audio DC coupling capacitors; +/- 10% tolerance

C13

10 F

Microphone supply filter capacitor; +/- 10% tolerance

C12, C14

4.7uF

Microphone DC coupling capacitors; +/-5% tolerance

R5, R6

2k2

Microphone bias resistors; +/- 5%tolerance

C2, C5

10 F

PMU Blocking capacitors; +/- 10% tolerance

15k

Voltage Regulator feedback resistor

47k

Voltage Regulator feedback resistor

R3, R4

10k

Two wire interface pull up resistors; +/- 10% tolerance

Sum

VIA connection to analog

round plane (AGND)

AS3421 数据表(PDF) 53 Page - ams AG

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