WM8993 datasheet(42/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

IN1L_VOL[4:0], IN2L_VOL[4:0],

IN1R_VOL[4:0], IN2R_VOL[4:0]

VOLUME

(dB)

11101

+27.0

11110

+28.5

11111

+30.0

Table 5 Input PGA Volume Range

INPUT MIXER ENABLE

The WM8993 has two analogue input mixers which allow the Input PGAs and Line Inputs to be

combined in a number of ways and output to the ADCs, Output Mixers, or directly to the output

drivers via bypass paths.

The input mixers MIXINL and MIXINR are enabled by the MIXINL_ENA and MIXINR_ENA register

bits, as described in Table 6. These control bits also enable the RXVOICE input path, described in

the following section.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R2 (02h)

Power

Management

(2)

MIXINL_ENA

Left Input Mixer Enable

(Enables MIXINL and RXVOICE input to

MIXINL)

0 = Disabled

1 = Enabled

MIXINR_ENA

Right Input Mixer Enable

(Enables MIXINR and RXVOICE input

to MIXINR)

0 = Disabled

1 = Enabled

Table 6 Input Mixer Enable

INPUT MIXER CONFIGURATION AND VOLUME CONTROL

The left and right channel input mixers MIXINL and MIXINR can be configured to take input from up

to five sources:

IN1L or IN1R Input PGA

IN2L or IN2R Input PGA

IN1LP or IN1RP pin (PGA bypass)

RXVOICE mono differential input from IN2LP/VRXN and IN2RP/VRXP

MIXOUTL or MIXOUTR Output Mixer (Record path)

The Input Mixer configuration and volume controls are described in Table 7 for the Left input mixer

(MIXINL) and Table 8 for the Right input mixer (MIXINR). The signal levels from the Input PGAs may

be set to Mute, 0dB or 30dB boost. Gain controls for the PGA bypass, RXVOICE and Record paths

provide adjustment from -12dB to +6dB in 3dB steps.

To prevent pop noise, it is recommended that gain and mute controls for the input mixers are not

modified while the signal paths are active. If volume control is required on these signal paths, it is

recommended that this is implemented using the input PGA volume controls or the ADC volume

controls. The ADC volume controls are described in the “Analogue to Digital Converter (ADC)”

section.

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