STA333IS datasheet(21/43 Pages) STMICROELECTRONICS

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STA333IS

Interpolation ratio select

The STA333IS has variable interpolation (oversampling) settings such that internal

processing and FFX output rates remain consistent. The first processing block interpolates

by either 2 times or 1 time (pass-through) or provides a 2-time downsampling. The

oversampling ratio of this interpolation is determined by the IR bits.

Thermal warning recovery bypass

If the thermal warning adjustment is enabled (TWAB = 0), then the thermal warning recovery

determines if the -3 dB output limit is removed when thermal warning is negative.

If TWRB = 0 and TWAB = 0, then when a thermal warning disappears, the -3 dB output limit

is removed and the gain is added back to the system. If TWRB = 1 and TWAB = 0, then

when a thermal warning disappears, the -3 dB output limit remains until TWRB is changed

to zero or the device is reset.

Table 11. Interpolation ratio select

Bit

R/W

RST

Name

Description

4:3

R/W

IR [1:0]

Interpolation ratio select: Selects internal

interpolation ratio based on input I2S sampling

frequency.

Table 12. IR bit settings as a function of input sampling rate

Input sampling rate fS (kHz)

1st stage interpolation ratio

2-time oversampling

44.1

2-time oversampling

88.2

Pass-through

176.2

2-time downsampling

192

2-time downsampling

Table 13. Thermal warning recovery

Bit

R/W

RST

Name

Description

5R/W

1TWRB

Thermal warning recovery bypass:

0: thermal warning recovery enabled

1: thermal warning recovery disabled

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