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LIMITER ATTACK/

RELEASE

Signal Level < Limiter threshold

BOP ATTACK/

RELEASE

LIM_MAX_ATN

ATTNUATION

APPLIED

BOP

ATTN

BOP ACTIVE PHASE (BOP_GAIN

0dB)

PAUSE LIMITER UPDATES

Supply Voltage < BOP threshold

Figure 6-4. Limiter and Brown out gain attenuation

6.4.2.4.1 Voltage Limiter and Clipping protection

The supply tracking limiter can be configured using LIM_MODE[1:0] register. In the VBAT voltage mode, the

limiter tracks the VBAT supply voltage for voltage limiter and in PVDD voltage mode, the limiter tracks the PVDD

voltage for external PVDD mode of use case.

Table 6-24. Limiter mode selection

LIM_MODE[1:0]

Configuration

00 (default)

Disabled

VBAT voltage based limiter

PVDD voltage based limiter

Reserved

The limiter can be configured to reduce the output signal based on fixed signal threshold level, or it can

attenuate signal based on a dynamic threshold which tracks the selected supply voltage. The register bit

SUPPLY_HEADROOM_LIM_MODE enables the dynamic supply tracking and can be used to limit the clipping

distortion when the supply voltage is varying in the system.

Table 6-25. Limiter dynamic supply headroom

tracking mode

SUPPLY_HEADROOM_LIM_MO

Configuration

0(default)

Disabled

Enabled. Limiter threshold is

dynamically changed based as

a fixed percentage of monitored

supply voltage.

When SUPPLY_HEADROOM_LIM_MODE is set high, the limiter sets the threshold as a fixed percentage

of the monitored supply voltage. The limiter begins reducing gain when the output signal level is greater

than the threshold configured. For eg, if voltage limiting is desired to be 10% below the supply voltage, then

LIM_SLOPE[23:0] is configured as 0.9 and the threshold is calculated as monitored supply voltage multiplied by

1.1. Similarly if the LIM_SLOPE[23:0] is configured at > 1.0, the limiter threshold is set at higher than the supply

voltage, and a small amount of controlled clipping occurs.

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TAS2120

SLASFC6 – AUGUST 2024

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