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Device can also loop back echo reference digital audio data at the end of the internal signal processing

blocks like Limiter, BOP etc. through SDOUT signal. This allows audio system to perform noise and echo

cancellation algorithms in a host processor that is connected to the device. The echo reference can be enabled

by configuring AUDIO_TX register bit. The slot length and the time slot can be selected using AUDIO_SLEN and

AUDIO_SLOT[5:0] register bits.

6.4.4 Boost

The TAS2120 internal processing algorithm automatically enables the boost when needed. A look-ahead

algorithm monitors the battery voltage and the digital audio stream. When the speaker output approaches the

battery voltage the boost is enabled in-time to supply the required speaker output voltage. When the boost is

no longer required it is disabled and bypassed to maximize efficiency. The boost can be configured in one of

two modes. The first is low in-rush (Class-G) supporting only boost on-off and has the lowest in-rush current.

The second is high-efficiency (Class-H) where the boost voltage level is adjusted to a value just above what is

needed. This mode is more efficient but has a higher in-rush current to quickly transition the levels. This can be

configured using BST_MODE[1:0] register bits.

Class-G

Class-H

Time

Figure 6-9. Boost Mode Signal Tracking Example

Table 6-30. Boost Mode

BST_MODE[1:0]

BOOST MODE

Class-H - High efficiency (default)

Class-G - Low in-rush

Always On

Always Off - Pass-through

The boost can be enabled and disabled using BST_EN register. When driving the Class-D amplifier using an

external supply through the PVDD pin, the boost should be disabled and the SW pin should be left floating.

Table 6-31. Boost Enable

BST_EN

BOOST IS

Disabled (External PVDD mode)

Enabled (default)

The maximum boost voltage is set by VBOOST_MAX_CTRL[7:0]. When operating in class-G mode, the boost

when needed will be at this voltage. In class-H mode of operation the boost voltage is automatically selected

based on the audio signal but will not exceed this set value. In class-H mode, the class-H controller controls the

Boost with a minimum step size of 33mV to generate the required PVDD voltage. The max boost voltage that the

device generates is controlled by VBOOST_MAX_CTRL[7:0] and it can be configured with a step size of 66mV.

Table 6-32. Boost Max Regulation Voltage

VBOOST_MAX_CTRL[7:0]

BOOST VOLTAGE (V)

0x00 - 0x53

Reserved

0x54

5.54 V

0x55

5.61 V

TAS2120

SLASFC6 – AUGUST 2024

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