APR6008 Aplus Integrated circuits Inc., APR6008 Datasheet - Page 2

• Manufacturer Part Number: APR6008
• Description: 8 Min. -- Recording & Playback Voice Ic
• Manufacturer: Aplus Integrated circuits Inc.

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 APR6008 Block Diagram :
http://www.aplusinc.com.tw
INTEGRATED CIRCUITS INC.--
2
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.
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 APR6008.
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APR6008
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