SM5876AM datasheet(15/17 Pages) NPC

15 / 17 page

SM5876AM

NIPPON PRECISION CIRCUITS—15

Output mode setting (MDT 4-bit data)

The left-channel and right-channel outputs can be set

to any one of 16 different modes, as shown in table 2.

“Stereo” is the default after system reset.

“Mute” refers to soft muting.

Soft mute (output mode setting)

The channel output muting set by the output mode

control 4-bit data is soft mute mode.

The attenuation counter output decrements by 1 step

at a time, reducing the gain. The signal is completely

muted after a time of (1024/fs), which corresponds to

approximately 23.2 ms when fs = 44.1 kHz.

Conversely, when soft mute is released using the out-

put mode control, the attenuation counter output

increments by 1 step at a time, increasing the gain.

The time taken to return to 0 dB from full muting is

also (1024/fs).

When an attenuation value is set, the output gain

decreases from the value set by the attenuation data

until the gain is

−∞. Similarly for mute release, the

output gain increases from the current value until the

gain is 0 dB.

Soft

mute

operation

shown

ﬁgure

Table 2. Output mode control

PL0

PL1

PL2

PL3

Left-channel output

Right-channel output

Notes

0000

Mute

0001

Mute

0010

Mute

0011

Mute

(L + R)/2

0100

Mute

0101

0110

Reverse

0111

(L + R)/2

1000

Mute

1001

Stereo

1010

1011

(L + R)/2

1100

(L + R)/2

Mute

1101

(L + R)/2

1110

(L + R)/2

1111

(L + R)/2

Upon system reset initialization, mute is released,

which corresponds to the maximum gain of 0 dB.

Attenuator control (ATC ﬂag)

The attenuator control (ATC) ﬂag is input on MDT.

When the ATC ﬂag is HIGH, the left-channel and

right-channel attenuator data is common. In this

mode, the left-channel data is used for both channels.

Figure 3. Soft mute operation example

Gain

MUTE

1024/fs

0 dB

–

∞

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