STA328_08 datasheet(21/57 Pages) STMICROELECTRONICS

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STA328

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bits determine the PLL factor generating the internal clock and the IR bit determines the

oversampling ratio used internally.

The STA328 has variable interpolation (re-sampling) 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 down-sample by a factor of 2.

The IR bits determine the re-sampling ratio of this interpolation.

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

recovery will determine if the adjustment is removed when thermal warning is negative. If

TWRB = 0 and TWAB = 0, then when a thermal warning disappears the gain adjustment

determined by the thermal warning post-scale (default = -3 dB) will be removed and the gain

will be added back to the system. If TWRB = 1 and TWAB = 0, then when a thermal warning

disappears the thermal warning post-scale gain adjustment will remain until TWRB is

changed to zero or the device is reset.

Table 11.

IR and MCS settings for input sample rate and clock rate

Input sample rate

fs (kHz)

MCS[2:0]

000

001

010

011

100

101

32, 44.1, 48

768 fs

512 fs

384 fs

256 fs

128 fs

576 fs

88.2, 96

384 fs

256 fs

192 fs

128 fs

64 fs

176.4, 192

384 fs

256 fs

192 fs

128 fs

64 fs

Table 12.

Interpolation ratio select

Bit

R/W

RST

Name

Description

4:3

IR[1:0]

Interpolation ratio select: 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)

IR[1,0]

1st stage interpolation ratio

2 times over-sampling

44.1

2 times over-sampling

88.2

Pass-through

176.4

Down-sampling by 2

192

Down-sampling by 2

Table 14.

Thermal warning recovery bypass

Bit

R/W

RST

Name

Description

5RW

TWRB

Thermal warning recovery bypass:

0: thermal warning recovery enabled

1: thermal warning recovery disabled

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