WM8994ECSSLASHR datasheet(47/363 Pages) CIRRUS

47 / 363 page

WM8994

Rev 4.6

LINE AND VOICE CODEC INPUTS

All eight analogue input pins may be used as line inputs. Each line input has different signal path

options, providing flexibility, high performance and low power consumption for many different usage

modes.

IN1LN and IN1RN can operate as single-ended line inputs to the input PGAs IN1L and IN1R

respectively. These inputs provide a high gain path if required for low input signal levels.

IN2LN and IN2RN can operate as single-ended line inputs to the input PGAs IN2L and IN2R

respectively, providing further high gain signal paths. These pins can also be connected to either of

the output mixers MIXOUTL and MIXOUTR.

IN1LP and IN1RP can operate as single-ended line inputs to the input mixers MIXINL and MIXINR, or

to the speaker mixers SPKMIXL and SPKMIXR. These signal paths enable power consumption to be

reduced, by allowing the input PGAs and other circuits to be disabled if not required.

IN2LP/VRXN and IN2RP/VRXP can operate in three different ways:



Mono differential ’RXVOICE’ input (e.g. from an external voice CODEC) to the input mixers

MIXINL and MIXINR.



Single-ended line inputs to either of the output mixers MIXOUTL and MIXOUTR.



Ultra-low power mono differential

‘Direct Voice’ input (e.g. from an external voice CODEC)

to the ear speaker driver on HPOUT2, or to either of the speaker drivers on SPKOUTL and

SPKOUTR.

Signal path configuration to the input PGAs and input mixers is detailed later in this section. Signal

path configuration to the

output mixers and speaker mixers is described in “Analogue Output Signal

Path

”.

The line input and voice CODEC input configurations are illustrated in Figure 15 through to Figure 18.

MIXINL/R

PGA

VMID

IN1LN or

IN1RN

Line Input

PGA

VMID

IN2LN,

IN2RN

Line Input

MIXINL/R

MIXOUTL/R

Figure 15 IN1LN or IN1RN as Line Inputs

Figure 16 IN2LN or IN2RN as Line Inputs

PGA

VMID

IN1LP,

IN1RP

Line Input

MIXINL/R

SPKMIXL/R

PGA

VMID

IN2LP/VRXN or

IN2RP/VRXP

Line Input

MIXINL/R

‘Direct Voice’

‘Rx Voice’

MIXOUTL/R

Bypass

SPKOUTL/R or

HPOUT2

Figure 17 IN1LP or IN1RP as Line Inputs

Figure 18 IN2LP or IN2RP as Line Inputs

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