rsc-4128 ETC-unknow, rsc-4128 Datasheet - Page 27

• Manufacturer Part Number: rsc-4128
• Description: Speech Recognition Processor
• Manufacturer: ETC-unknow

Data Sheet
Analog Input
The analog front end (AFE) for the RSC-4128 consists of a preamplifier with gain control, a 16-bit analog-to-digital
converter, digital decimator and channel filters, and associated references. A single analog input can be processed
through the AFE. All of this circuitry can be powered down to conserve battery life by programming register EF.Bit0
to “0”. Setting this bit to “1” powers up the circuitry, requiring a settling time of approximately 10milliseconds.
The analog front end (AFE) performs analog to digital conversions on a low-level signals, which may be derived
from an electret microphone. The microphone signal is amplified by a preamp that provides four levels of gain,
which are selected by programming register D5.Bits[4:3].
input signals of 100, 50, 25, and 12.5 millivolts Vpeak-peak, as shown in the table below.
Input signals higher than specified will produce a saturated full scale output with no wrap around. A line level audio
input must be attenuated to the range shown above for use with the AFE.
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Bits[4:3]
“sysCtl”
Gain
00
01
10
11
Input Referred
µVrms
Noise
5.2*
4.9*
4.6*
4.4
P/N 80-0206-R
Full-scale output for the four settings corresponds to
mVp-p
12.5
100
50
25
Max Input Signal
mVrms
35.4
17.7
8.8
4.4
© 2006 Sensory Inc.
RSC-4128