STA335W datasheet(19/43 Pages) STMICROELECTRONICS

19 / 43 page

STA335W

19/43

5.1.2

Interpolation ratio select

The STA335W 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.

5.1.3

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.

5.1.4

Thermal warning adjustment bypass

The on-chip STA335W power output block provides feedback to the digital controller using

inputs to the power control block. Input TWARN is used to indicate a thermal warning

Table 12.

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 13.

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 14.

Thermal warning recovery bypass

Bit

R/W

RST

Name

Description

5R/W

TWRB

0: Thermal warning recovery enabled

1: Thermal warning recovery disabled

Table 15.

Thermal warning adjustment bypass

Bit

R/W

RST

Name

Description

6R/W

TWAB

0: Thermal warning adjustment enabled

1: Thermal warning adjustment disabled

STA335W Arkusz danych(PDF) 19 Page - STMicroelectronics

STA335W Arkusz danych(HTML) 19 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Arkusz danych Pobierz

Link URL