STA339BW datasheet(29/78 Pages) STMICROELECTRONICS

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STA339BW

7.1.2

Interpolation ratio select

The STA339BW 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-times downsample. The

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

7.1.3

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.

7.1.4

Thermal warning adjustment bypass

Table 13. Internal interpolation ratio

Bit

R/W

RST

Name

Description

4:3

R/W

IR [1:0]

Selects internal interpolation ratio based on input I2S

sample frequency

Table 14. IR bit settings as a function of input sample rate

Input sample rate fs (kHz)

1st stage interpolation ratio

2 times oversampling

44.1

2 times oversampling

88.2

Pass-through

176.4

2 times downsampling

192

2 times downsampling

Table 15. Thermal warning recovery bypass

Bit

R/W

RST

Name

Description

R/W

TWRB

0: Thermal warning recovery enabled

1: Thermal warning recovery disabled

Table 16. Thermal warning adjustment bypass

Bit

R/W

RST

Name

Description

R/W

TWAB

0: Thermal warning adjustment enabled

1: Thermal warning adjustment disabled

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