WM1811A datasheet(44/328 Pages) WOLFSON

44 / 328 page

WM1811A

Production Data

PD, November 2013, Rev 4.1

INPUT PGA CONFIGURATION

Each of the Input PGAs can operate in a single-ended ordifferential mode. In differential mode, both

inputs to the PGA are connected to the input source. In single-ended mode, the non-inverting input to

the PGA must be connected to VMID. Configuration of the PGA inputs to the WM1811A input pins is

controlled using the register bits shown in Table 3.

Single-ended microphone operation is configured by connecting the input source to the inverting input

of the applicable PGA. The non-inverting input of the PGA must be connected to the buffered VMID

reference. Note that the buffered VMID reference must be enabled, using the VMID_BUF_ENA

Differential microphone operation is configured by connecting the input source to both inputs of the

applicable PGA.

Line inputs to the input pins IN1LN, IN2LN, IN1RN and IN2RN must be connected to the applicable

PGA. The non-inverting input of the PGA must be connected to VMID.

Line inputs to the input pins IN1LP, IN2LP, IN1RP or IN2RP do not connect to the input PGAs. The

non-inverting inputs of the associated PGAs must be connected to VMID. The inverting inputs of the

associated PGAs may be used as separate mic/line inputs if required.

The maximum available attenuation on any of these input paths is achieved by using register bits

shown in Table 3to disconnect the input pins from the applicable PGA.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R40 (0028h)

Input Mixer

(2)

IN2LP_TO_IN2L

IN2L PGA Non-Inverting Input Select

0 = Connected to VMID

1 = Connected to IN2LP

Note that VMID_BUF_ENA must be

set when using IN2L connected to

VMID.

IN2LN_TO_IN2L

IN2L PGA Inverting Input Select

0 = Not connected

1 = Connected to IN2LN

IN1LP_TO_IN1L

IN1L PGA Non-Inverting Input Select

0 = Connected to VMID

1 = Connected to IN1LP

Note that VMID_BUF_ENA must be

set when using IN1L connected to

VMID.

IN1LN_TO_IN1L

IN1L PGA Inverting Input Select

0 = Not connected

1 = Connected to IN1LN

IN2RP_TO_IN2R

IN2R PGA Non-Inverting Input Select

0 = Connected to VMID

1 = Connected to IN2RP

Note that VMID_BUF_ENA must be

set when using IN2R connected to

VMID.

IN2RN_TO_IN2R

IN2R PGA Inverting Input Select

0 = Not connected

1 = Connected to IN2RN

IN1RP_TO_IN1R

IN1R PGA Non-Inverting Input Select

0 = Connected to VMID

1 = Connected to IN1RP

Note that VMID_BUF_ENA must be

set when using IN1R connected to

VMID.

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