APR6016 데이터 시트보기 (PDF) - APLUS INTEGRATED CIRCUITS
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APR6016 Datasheet PDF : 24 Pages
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INTEGRATED CIRCUITS INC.--APR6016
Functional Description :
The EXTCLK pin allows the use of an external
sampling clock. This input can accept a wide
range of frequencies depending on the divider
ratio programmed into the divider that follows the
clock. Alternatively, the programmable internal
oscillator can be used to supply the sampling
clock. The MUX following both signals
automatically selects the EXTCLK signal if a clock
is present, otherwise the internal oscillator source
is chosen. Detailed information on how to program
the divider and internal oscillator can be found in
the explanation of the PWRUP command, which
appears in the OpCode Command Description
section. Guidance on how to choose the
appropriate sample clock frequency can be found
in the Sampling Rate & Voice Quality section.
The audio signal containing the content you wish
to record should be fed into the differential inputs
ANAIN-,and ANAIN+. After pre-amplification the
signal is routed into the anti-aliasing filter. The
anti-aliasing filter automatically adapts its
response based on the sample rate being used.
No external anti-aliasing filter is therefore
required.
After passing through the anti-alias filter, the
signal is fed into the sample and hold circuit which
works in conjunction with the Analog Write Circuit
to store each analog sample in a flash memory
cell.
Figure 2 APR6016 Block Diagram :
When a read operation is desired the Analog
Read Circuit extracts the analog data from the
memory array and feeds the signal to the Internal
Low Pass Filter. The low pass filter converts the
individual samples into a continuous output. The
output signal then goes to the squelch control
circuit and differential output driver.
The differential output driver feeds the ANAOUT+
and ANAOUT- pins. Both differential output pins
swing around a 1.23V potential.The squelch
control circuit automatically reduces the output
signal by 6 dB during quiet passages. A copy of
the squelch control signal is present on the
SQLOUT pin to facilitate reducing gain in the
external amplifier as well.
For more information, refer to the Squelch section.
After passing through the squelch circuit the
output signal goes to the output amplifier. The
output amplifier drives a single ended output on
the AUDOUT pin. The single ended output swings
around a 1.23V potential.All SPI control and hand
shaking signals are routed to the Master Control
Circuit. This circuit decodes all the SPI signals and
generates all the internal control signals.
It also contains the status register used for
examining the current status of the APR6016.
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