APR6016 DATASHEET PDF

A maximum of 30K bits of digital data can be stored. APR devices can be cascaded for longer duration recording or greater digital storage. Device control is accomplished through an industry standard SPI interface that allows a microcontroller to manage message recording and playback. This flexible arrangement allows for the widest variety of messaging options. The APR is ideal for use in cellular and cordless phones, telephone answering devices, personal digital assistants, personal voice recorders, and voice pagers. Each memory cell can typically store voltage levels.

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A maximum of 30K bits of digital data can be stored. APR devices can be cascaded for longer duration recording or greater digital storage. Device control is accomplished through an industry standard SPI interface that allows a microcontroller to manage message recording and playback.

This flexible arrangement allows for the widest variety of messaging options. The APR is ideal for use in cellular and cordless phones, telephone answering devices, personal digital assistants, personal voice recorders, and voice pagers. Each memory cell can typically store voltage levels.

This allows the APR voice to reproduce audio signals in their natural form, eliminating the need for encoding and compression which can introduce distortion. 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.

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.

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. Both differential output pins swing around a 1. The squelch control circuit automatically reduces the output signal 6 dB during quiet passages.

For more information, refer to the Squelch section. After passing through the squelch circuit the output signal goes to the output amplifier. The single ended output swings around a 1.

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 APR The smallest addressable memory unit is called a "sector". The APR contains sectors. All memory management is handled by an external host processor. The SPI port can run on as little as three wires or as many as seven depending on the amount of control necessary. OpCode commands are clocked in on the rising edge of the SPI clock.

Figure 4 shows the timing diagram for shifting OpCode commands into the device. Figure is a description of the OpCode stream. You must wait for a command to finish executing before sending a new command. You can substitute monitoring of the busy pin by inserting a fixed delay between commands.

The required delay is specified T next4. Figure 6 shows the timing diagram for sending consecutive commands. Table 1 describes which T next specification to use. Sectors 0 through can be used for analog storage. During audio recording one memory cell is used per sample clock cycle.

When recording is stopped an end of data EOD bit is programed into the memory. This prevents playback of silence when partial sectors are used. Unused memory that exists between the EOD bit and the end of the sector can not be used. Sectors 0 through 9 are tested and guaranteed for digital storage. This can be managed with error correction or forward check-before-store methods.

Once a write cycle is initiated all previously written data in the chosen sector is lost. Mixing audio signals and digital data within the same sector is not possible. Note: There are a total of 15bits reserved for addressing.

The APR only requires 11 bits.

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APR6016 DATASHEET PDF

Each memory cell can typically store voltage. A0] bits according to the following binary values APR Follow Summary Starts a record operation from the sector address specified. The APR is ideal for use in cellular and cordless phones, telephone answering devices, personal digital assistants, personal voice ecorders,and voice pagers. Starts a record operation from the current sector address.

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The APR memory array is organized to allow the great- est flexibility in message management and digital storage. The APR contains sectors. Figure 3 Sectors 0 through can be used for analog storage. Dur- ing audio recording one memory cell is used per sample clock cycle. When recording is stopped an end of data EOD bit is programed into the memory.

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