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ISD5008SI Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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ISD5008SI Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 47 page ISD5008 Product 1 ISD 1 DETAILED DESCRIPTION 1.1 SPEECH/SOUND QUALITY The ISD5008 ChipCorder product can be config- ured via software to operate at 4.0, 5.3, 6.4, and 8.0 kHz sampling frequencies, allowing the user a choice of speech quality options. Increasing the duration decreases the sampling frequency and bandwidth, which affects sound quality. Table 1 compares filter pass band and product durations. The speech samples are stored directly into on-chip nonvolatile memory without the digitization and compression associated with other solutions. Di- rect analog storage provides a natural sounding reproduction of voice, music, tones, and sound effects not available with most solid-state solu- tions. 1.2 DURATION To meet end system requirements, the ISD5008 device is a single-chip solution which provides from 4 to 8 minutes of voice record and playback, depending on the sample rates defined by cus- tomer software. 1.3 FLASH STORAGE One of the benefits of ISD’s ChipCorder technology is the use of on-chip nonvolatile memory, which pro- vides zero-power message storage. The message is retained for up to 100 years (typically) without power. In addition, the device can be re-record- ed over 100,000 times (typically). 1.4 MICROCONTROLLER INTERFACE A four-wire (SCLK, MOSI, MISO, SS) SPI interface is provided for ISD5008 control, addressing func- tions, and sample rate selection. The ISD5008 is configured to operate as a peripheral slave de- vice with a microcontroller-based SPI bus inter- face. Read/Write access to all the internal registers occurs through this SPI interface. An interrupt sig- nal (INT) and internal read-only Status Register are provided for handshake purposes. 1.5 PROGRAMMING The ISD5008 series is also ideal for playback-only applications, where single or multiple message Playback is controlled through the SPI port. Once the desired message configuration is created, du- plicates can easily be generated via an ISD or third-party programmers. For more information on available application tools and programmers please see the ISD web site at www.isd.com. Table 1: Input Sample Rate to Duration Input Sample Rate (kHz) Duration (Minutes) Typical Filter Pass Band (kHz) 8.0 4.0 3.4 6.4 5.0 2.7 5.3 6.0 2.3 4.0 8.0 1.7 |
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