TAS5760MDAPR datasheet(33/84 Pages) TI1

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TAS5760M

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SLOS772D – JULY 2013 – REVISED JULY 2015

Device Functional Modes (continued)

Table 3 details the supported SCLK rates for each of the available sample rate and MCLK rate configurations.

For each fS and MCLK rate, the supported SCLK rates are shown and are represented in multiples of the sample

rate, which is written as "x fS".

Table 3. Supported SCLK Rates in Hardware Control Mode (Single Speed Mode)

MCLK Rate

[x fS]

128

192

256

384

512

Sample Rate [kHz]

N/S

32, 48, 64

N/S

32, 48, 64

N/S

32, 48, 64

44.1

32, 48, 64

9.4.1.3 Soft Clipper Control (SFT_CLIP Pin)

The TAS5760M has a soft clipper that can be used to clip the output voltage level below the supply rail. When

this circuit is active, the amplifier operates as if it was powered by a lower supply voltage, and thereby enters into

clipping sooner than if the circuit was not active. The result is clipping behavior very similar to that of clipping at

the PVDD rail, in contrast to the digital clipper behavior which occurs in the oversampled domain of the digital

path. The point at which clipping begins is controlled by a resistor divider from GVDD_REG to ground, which sets

the voltage at the SFT_CLIP pin. The precision of the threshold at which clipping occurs is dependent upon the

voltage level at the SFT_CLIP pin. Because of this, increasing the precision of the resistors used to create the

voltage divider, or using an external reference will increase the precision of the point at which the device enters

into clipping. To ensure stability, and soften the edges of the clipping event, a capacitor should be connected

from pin SFT_CLIP to ground.

Figure 45. Soft Clipper Example Wave Form

To move the output stage into clipping, the soft clipper circuit limits the duty cycle of the output PWM pulses to a

fixed maximum value. After filtering this limit applied to the duty cycle resembles a clipping event at a voltage

below that of the PVDD level. The peak voltage level attainable when the soft clipper circuit is active, called VP in

the example below, is approximately 4 times the voltage at the SFT_CLIP pin, noted as VSFT_CLIP. This voltage

can be used to calculate the maximum output power for a given maximum input voltage and speaker impedance,

as shown in the equation below.

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