STA309A datasheet(23/67 Pages) STMICROELECTRONICS

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STA309A

Registers

23/67

Interpolation ratio select

The STA309A has variable interpolation (oversampling) settings such that internal

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

by either 4 times, 2 times, or 1 time (pass-through).

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

Setting the DSPB bit bypasses the biquad function of the Omega DDX core.

Table 11.

Interpolation ratio bits

Bit

RST

Name

Description

3RW

IR0

Interpolation ratio select: selects internal interpolation

ratio based on input I2S sample frequency

4RW

IR1

Table 12.

IR sample rates

IR[1,0]

Input sample rate

Fs (kHz)

1st stage interpolation ratio

4-times oversampling

44.1

4-times oversampling

88.2

2-times oversampling

176.4

Pass-through

192

Pass-through

DSD

DSD to 176.4 kHz conversion

Table 13.

DSPB bit

Bit

RST

Name

Description

DSPB

DSP bypass bit:

0: normal operation

1: bypass of biquad and bass/treble functions

Table 14.

COS bits

COS[1,0]

CKOUT frequency

PLL output

PLL output / 4

PLL output / 8

PLL output / 16

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