WM9713 datasheet(42/111 Pages) WOLFSON

42 / 111 page

WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

MIC1

MIC2A

MICCM

MIC2B

Vmid

22h:11-10

00 = +12dB

11 = +30dB

22h:9-8

00 = +12dB

11 = +30dB

22h:

13-12

MICA

MICB

Figure 12 Microphone Input Circuit

The input pins used for the microphones are MIC1, MICCM, MIC2A and MIC2B. Note that input pins

MIC2A and MIC2B are multi-function inputs and must be configured for use as microphone inputs

when required. This is achieved using MICCMPSEL[1:0] in register 22h (see Table 22). The input to

microphone pre-amp A can be selected from any of the three microphone inputs MIC1, MIC2A and

MIC2B using MPASEL[1:0]. Each pre-amp has independent boost control from +12dB to +30dB in

four steps. This is controlled by MPABST[1:0] and MPBBST[1:0].

When not in use each microphone pre-amp can be powered down using the Powerdown register bits

MPA and MPB (register 3Eh, bits [1:0]). When disabled the inputs are tied to Vmid (for MIC2A and

MIC2B this only applies when they are selected as microphone inputs, otherwise they are left

floating).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

15:14

MICCMPSEL

MIC2A and MIC2B pin configuration

00: MIC2A and MIC2B microphone inputs

01: MIC2A only

10: MIC2B only

11: neither

13:12

MPASEL

MICA pre-amp input select

00 : MIC1

01 : MIC2A

10 : MIC2B

11 : unused (do not select)

11:10

MPABST

MICA pre-amp gain control

00 : +12dB

01 : +18dB

10 : +24dB

11 : +30dB

22h

9:8

MPBBST

MICB pre-amp gain control

00 = +12dB

01 = +18dB

10 = +24dB

11 = +30dB

Table 22 Microphone Pre-amp Control

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