STA335BWS View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA335BWS

2.1 channels high efficiency digital audio system

STMicroelectronics 

Register description

STA335BWS

6.1.2 Interpolation ratio select

6.1.3

Bit R/W RST

4:3 R/W

00

Name

IR[1:0)

Description

Selects internal interpolation ratio based on input I2S

sample frequency

The STA335BWS has variable interpolation (oversampling) settings such that internal

processing and DDX 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.

Table 11. IR bit settings as a function of input sample rate

Input sample rate Fs (kHz)

IR

1st stage interpolation ratio

32

00

2 times oversampling

44.1

00

2 times oversampling

48

00

2 times oversampling

88.2

01

Pass-through

96

01

Pass-through

176.4

10

2 times downsampling

192

10

2 times downsampling

Thermal warning recovery bypass

Bit R/W RST

Name

Description

5

R/W

1

TWRB

0: Thermal warning recovery enabled

1: Thermal warning recovery disabled

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.

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