WM8750L Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8750L

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

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WM8750L

DC MEASUREMENT

For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1

and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and

microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a

signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The

input range for dc measurement is AGND to AVDD.

REGISTER

ADDRESS

R32 (20h)

ADC Signal

Path Control

(Left)

BIT

LABEL

7:6 LINSEL

5:4 LMICBOOST

R33 (21h)

ADC Signal

Path Control

(Right)

7:6 RINSEL

5:4 RMICBOOST

Table 2 Input Software Control

DEFAULT

DESCRIPTION

00

Left Channel Input Select

00 = LINPUT1

01 = LINPUT2

10 = LINPUT3

11 = Differential

00

Left Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

00

Right Channel Input Select

00 = RINPUT1

01 = RINPUT2

10 = RINPUT3

11 = Differential

00

Right Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

REGISTER

BIT

ADDRESS

LABEL

R31 (1Fh)

5 RDCM

ADC input Mode

4 LDCM

Table 3 DC Measurement Select

DEFAULT

DESCRIPTION

0

Right Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on RINPUT1

0

Left Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on LINPUT1

REGISTER

BIT

ADDRESS

LABEL

R31 (1Fh)

8 DS

ADC Input Mode

Table 4 Differential Input Select

DEFAULT

DESCRIPTION

0

Differential input select

0: LINPUT1 - RINPUT1

1: LINPUT2 – RINPUT2

PP Rev 1.77 May 2003

17

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