WM8956 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8956

Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers

Wolfson Microelectronics plc 

Production Data

WM8956

The input PGAs and boost mixers are enabled by the AINL and AINR register bits. The microphone

PGAs can be also be disabled independently of the boost mixer to save power, using LMIC and RMIC

register bits.

REGISTER

ADDRESS

R25 (19h)

Power

Management

(1)

BIT

5

LABEL

AINL

4

AINR

R47 (2Fh)

5

Power

Management

(3)

4

LMIC

RMIC

DEFAULT

DESCRIPTION

0

Left channel input PGA and boost

stage enable

0 = PGA disabled, boost disabled

1 = PGA enabled (if LMIC = 1),

boost enabled

0

Right channel input PGA and boost

stage enable

0 = PGA disabled, boost disabled

1 = PGA enabled (if LMIC = 1),

boost enabled

0

Left channel input PGA enable

0 = PGA disabled

1 = PGA enabled (if AINL = 1)

0

Right channel input PGA enable

0 = PGA disabled

1 = PGA enabled (if AINR = 1)

Table 2 Input PGA and Boost Enable Register Settings

The input PGAs can be configured as differential inputs, using LINPUT1/LINPUT2 or

LINPUT1/LINPUT3, and RINPUT1/RINPUT2 or RINPUT1/RINPUT3. The input impedance to these

non-inverting inputs is constant in this configuration. Differential configuration is controlled by LMP2,

LMP3, RMP2 and RMP3 as shown in Table 3.

When single-ended configuration is selected, the non-inverting input of the PGA is connected to

VMID.

REGISTER BIT

LABEL

ADDRESS

R32 (20h) 3

LMIC2B

Left Input

Signal Path

6

LMP2

7

LMP3

8

LMN1

R33 (21h) 3

Right Input

Signal Path

6

RMIC2B

RMP2

DEFAULT

DESCRIPTION

0

Connect Left Input PGA to Left Input Boost

mixer

0 = Not connected

1 = Connected

0

Connect LINPUT2 to non-inverting input of

Left Input PGA

0 = LINPUT2 not connected to PGA

1 = LINPUT2 connected to PGA (Constant

input impedance)

0

Connect LINPUT3 to non-inverting input of

Left Input PGA

0 = LINPUT3 not connected to PGA

1 = LINPUT3 connected to PGA (Constant

input impedance)

1

Connect LINPUT1 to inverting input of Left

Input PGA

0 = LINPUT1 not connected to PGA

1 = LINPUT1 connected to PGA

0

Connect Right Input PGA to Right Input

Boost mixer

0 = Not connected

1 = Connected

0

Connect RINPUT2 to non-inverting input of

Right Input PGA

0 = RINPUT2 not connected to PGA

1 = RINPUT2 connected to PGA (Constant

input impedance)

w

PD, November 2011, Rev 4.1

19

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