TS2012FC

Application information

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is too high, a TS2012 breakdown. For filtering low frequency noise signals on the power line,

In addition, even if a ceramic capacitor has an adequate high frequency ESR (equivalent

series resistance) value, its current capability is also important. A 0603 size is a good

compromise, particularly when a 4

Ω load is used.

Another important parameter is the rated voltage of the capacitor. A 1 µF/6.3 V capacitor

used at 5 V, loses about 50% of its value. With a power supply voltage of 5 V, the decoupling

THD+N in the medium to high frequency region, this capacitor variation becomes decisive.

In addition, less decoupling means higher overshoots which can be problematic if they reach

the power supply AMR value (6 V).

4.6

During the wake-up sequence when the standby is released to set the device ON, there is a

delay. The wake-up sequence of the TS2012 consists of two phases. During the first phase

begins. The gain increases smoothly form the mute state to the preset gain selected by the

digital pins G0 and G1. This startup sequence allows to avoid any pop noise during startup

of the amplifier. See Figure 37: Wake-up phase.

Figure 37.

Wake-up phase.

When the standby command is set, the time required to set the output stage into high

impedance and to put the internal circuitry in shutdown mode is called the standby time.

This time is used to decrease the gain from its nominal value set by the digital pins G0 and

G1 to mute and avoid any pop noise during shutdown. The gain decreases smoothly until

the outputs are muted. See Figure 38: Shutdown phase

Preset gain

Gain increasing

t

WU-A

t

WU

t

WU-B

STBY

Mute

Time

Time

Gain

STBY

Level

STBY

LO

HI

G = 6dB

G = 12dB

G = 18dB

G = 24dB

Mute