80-0206-R datasheet(28/49 Pages) ETC1

28 / 49 page

RSC-4128

Data Sheet

P/N 80-0206-R

Digital Transfer Functions

Lowpass response

Detail of passband

Attenuation

Frequency

Min

Max

Below 8 kHz

1.18

9.395 kHz

3 dB

20 kHz

87.82

Above 20 kHz

NOTE: A 1uF capacitor should be connected to AMPCOM and tied to GND, a 2.2uF should be connected to VCM

and tied to GND, and a 0.1uF capacitor should be connected to VREF and tied to GND. Failure to connect this

capacitors will substantially degrade ADC performance, and FluentChip™ technology.

A/D Conversion

The amplified signal is processed by a delta-sigma A/D converter that provides a 1-bit over-sampled digital signal.

This digital stream is filtered and decimated to produce 16-bit samples at the fixed rate of 18,636 samples per

second. The 16 bit signal will have about 12.5 bits of dynamic range, with about 10 bits above the noise level.

These samples are then provided to the RSC-4128 digital filter unit formatted as signed two’s-complement 16-bit

values. The samples are stored in the digital filter input registers “adcSampleHi” (register F5) and “adcSampleLo”

(register F4).

Note: Using the AFE for general purposes other than as intended in FluentChip™ technology modules may conflict

with FluentChip™. Such conflicts may adversely impact FluentChip™ functionality and/or the functionality of the

general purpose application. Care should be taken to avoid such conflicts. Contact Sensory Technical Support for

help in this area.

Audio Wakeup

The Audio Wakeup unit is an analog/digital circuit that can be configured to wakeup from one of four specific audio

events:

1) Two handclaps, or any two sharp, closely spaced sounds

2) Three handclaps, or any three sharp, closely spaced sounds

3) A whistle

4) Any “loud” sound above a specified amplitude, with duration options of 1 or 2 seconds

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