R262 datasheet(21/28 Pages) ONSEMI

21 / 28 page

BelaSigna R262

http://onsemi.com

Figure 10. Input Stage

ADC0

To IOP

ADC1

Line

out

Decimation

Filter

MIC0

AI1/LOUT1

Line

out

To IOP

Digital

Analog

Input Stage

Channel 0

MIC2

AI3/VMIC/LOUT0

Input Stage

Channel 1

Decimation

Filter

PA0

LPF0

PA1

LPF1

Output Stage

At all times, the application will produce two output

channels. The content of each channel is determined by the

hardware configuration.

The amplitude of both output channels can be controlled

by I2C commands, independently from the actual output

stage configuration that was selected. A first parameter

controls gain in 6 dB steps. A second parameter is a variable

for fine gain adjustment. With these two parameters, a great

level of flexibility is achieved to match the output level

requirements of the target device, independently for each of

the two output channels. The application has initialized these

parameters for proper operation of the algorithm and correct

output so careful design consideration should be taken when

modifying these parameters.

The BelaSigna R262 output stage is shown in Figure 11.

The output stage processes two channels although,

depending on the configuration, one or both of the output

signals are available on the output pins. There are four

options for audio outputs from BelaSigna R262 – a digital

microphone (DMIC) interface, a low−impedance output

driver, a stereo single−ended analog output or a mono

differential analog output. All outputs are generated from a

sigma−delta modulator which produces a pulse density

modulated (PDM) output signal and then provides it to the

appropriate output system, based on the system

configuration.

Figure 11. Output Stage

Interpolation

Filter

Output

Driver 0

A_OUT0

A_OUT1

Combiner

DMIC_OUT

From

Application

Channel 0

DAC0

DAC1

From

Application

Channel 1

Digital

Analog

Output Stage Channel 0

Output

Modulator

Interpolation

Filter

Output Stage Channel 1

Output

Modulator

Inversion

Delay,

inversion

and

muxing

OA0

LPF

OA1

LPF

The digital microphone interface provides the PDM

signals directly on a pin (DMIC_OUT), for interfacing with

the DMIC input of external systems. When using this

interface, the EXT_CLK input to BelaSigna R262 must be

given a DMIC_CLK signal and the system clocking must be

set up such that proper synchronization can happen between

the incoming DMIC_CLK and the output data produced by

BelaSigna R262 on its DMIC_OUT pin. Various

DMIC_CLK frequencies are supported through hardware

configuration on the CLOCK_SEL pin, as discussed earlier.

Other frequencies can also be supported under certain

conditions; see the clocking section of this document for

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