CS43L36 datasheet(22/89 Pages) CIRRUS

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DS1081F3

CS43L36

4.2 Analog Output

This section describes the headphone (HP) outputs. The CS43L36 provides an analog output that is fed from the mixer.

Fig. 4-3 shows the general flow of the analog outputs.

Figure 4-3. Analog-Output Signal Flow

The output path is sourced directly from the digital volume control output. The playback path uses advanced analog and digital

signal-processing techniques to adapt to the input signal content and enhance dynamic range and power consumption of the

playback path. The HP output must be muted before changing the state of FULL_SCALE_VOL (see p. 76), which sets the

maximum HPOUT output voltage. See Table 3-7. HP outputs are muted by ANA_MUTE_B and ANA_MUTE_A (see p. 76).

Fig. 4-4 is an op-amp–level schematic for the analog output flow.

Figure 4-4. Op-Amp-Level Schematic—Analog Outputs

4.2.1

Pseudodifferential Outputs

The analog output amplifiers use a pseudodifferential output topology that allows the amplifier to monitor the ground

potential at the load through the reference pins (HSx_REF). Minimize the impedance from the CS43L36 reference pin to

the load ground (typically the connector ground). Impedance in this path affects analog output attenuation as well as the

common-mode rejection of the output amplifier, which affects output offset and step deviation.

4.2.2

Output Load Detection

The CS43L36 can distinguish between the following output loads:

•RL = 15, 30, or 3 k

•CL < ~2 nF (low capacitance); CL > ~2 nF (high capacitance)

Note: Channels A and B must have matching loads, although load detection is performed using Channel A.

Before output load detection is initiated, the following steps must be performed:

1. HS-type information must be determined to run a headset load-detection sequence, as described in Section 4.8.

DAC Data Path

Left

Right

HSx_REF

HPOUTA

+VCP_FILT

–VCP_FILT

HPOUTB

+VCP_FILT

–VCP_FILT

DACB

Interpolator

DACA

Invert

DAC_HPF_EN

p. 76

HPOUT_LOAD p. 75

FULL_SCALE_VOL p. 76

ANA_MUTE_B p. 76

ANA_MUTE_A p. 76

DACx_INV p. 75

HPOUTx

DACx+

DACx–

HSx_REF

HPSENSx

–

WLCSP version only

HPOUTx

DACx+

DACx–

HSx_REF

–

QFN version only

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