Texas Instruments TMS320C3 Series, User Manual, Page: 40 / 166

DSK Hardware Interface
4-6
TLC32040 AIC hardware interface
The TLC32040 analog interface circuit (AIC) on the DSK provides:
-
A single-channel, input/output, analog interface with 14-bit dynamic range
ADC and DAC
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Variable ADC and DAC sampling rate with 14-bit precision at 20 000 sam-
ples per second
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Output reconstruction filter
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Bypassable, switched-capacitor, antialiasing input filter
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Selectable auxiliary analog input channel
The DSK connects the TLC32040 AIC to the ’C31 serial port through a header
and 100
Ω
isolation resistors. The header lets you disconnect the AIC and use
the ’C31’s serial port in the daughterboard. Two additional pins from the ’C31
control resetting and clocking signals to the AIC:
-
The ’C31’s TIMER0 pin drives the master input clock to the AIC.
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The ’C31’s XF0 signal resets the AIC.
The AIC’s analog input and output are connected to RCA plugs. These signals
are line-level compatible (+/–3 V peak) and can be connected to audio line-lev-
el inputs and outputs.
The output can also be connected directly to a speaker, but it does not have
a significant output level as the output drive is limited by the AIC output driver
and a series isolation resistor. For best results, use an external amplifier or
high impedance speaker, such as a headphone.
Note:
If the AIC is used with parameters outside the tested range, the AIC perfor-
mance may be degraded from that specified in the data sheet. See the
TLC32040 Data Sheet (SLAS014) for more information.