ADAU1361BCPZ-R7 datasheet(35/78 Pages) AD

35 / 78 page

Data Sheet

ADAU1361

PLAYBACK SIGNAL PATH

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Rev. E | 35 of 78

POP-AND-CLICK SUPPRESSION

Upon power-up, precharge circuitry is enabled to suppress pops

and clicks. After power-up, the precharge circuitry can be put

into a low power mode using the POPMODE bit in Register R34

(playback pop/click suppression register, Address 0x4028).

The precharge time depends on the capacitor value on the CM pin

and the RC time constant of the load. For a typical line output load,

the precharge time is between 2 ms and 3 ms. After this precharge

time, the POPMODE bit can be set to low power mode.

Changing any register settings that affect the signal path can cause

pops and clicks on the analog outputs. To avoid these pops and

clicks, mute the appropriate outputs using Register R29 to Register

R32 (Address 0x4023 to Address 0x4026). Unmute the analog

outputs after the changes are made.

LINE OUTPUTS

The line output pins (LOUTP, LOUTN, ROUTP, and ROUTN) can

be used to drive both differential and single-ended loads. In their

default settings, these pins can drive typical line loads of 10 kΩ or

greater, but they can also be put into headphone mode by setting

the LOMODE bit in Register R31 (playback line output left volume

control register, Address 0x4025) and the ROMODE bit in Register

R32 (playback line output right volume control register, Address

0x4026). In headphone mode, the line output pins are capable of

driving headphone and earpiece speakers of 16 Ω or greater. The

output impedance of the line outputs is approximately 1 kΩ.

When the line output pins are used in single-ended mode, LOUTP

and ROUTP should be used to output the signals, and LOUTN and

ROUTN should be left unconnected.

The volume controls for these outputs range from −57 dB to +6 dB.

Slew can be applied to all the playback volume controls using the

ASLEW[1:0] bits in Register R34 (playback pop/click suppression

The MX5G4[1:0], MX5G3[1:0], MX6G3[1:0], and MX6G4[1:0] bits

can all provide a 6 dB gain boost to the line outputs. This gain boost

allows single-ended output signals to achieve 0 dBV (1.0 V rms)

and differential output signals to achieve up to 6 dBV (2.0 V rms).

For more information, see Register R26 (playback L/R mixer left

(Mixer 5) line output control register, Address 0x4020) and Register

R27 (playback L/R mixer right (Mixer 6) line output control register,

Address 0x4021).

Figure 47. Differential Line Output Configuration

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