ISD4004-12MED

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The ISD4004-12MED is a specialized non-volatile memory chip used in complex audio device applications. Its intended purpose is to record and playback audio data from low-voltage, low-power digital audio sources. The chip is equipped with a fixed 2K byte data RAM, a 4 byte address counter, and a 25-bit wide address bus for addressing the data ram. It uses an analog-to-digital converter to accept data from an audio source and to store it in the RAM. The chip is also equipped with a digital-to-analog converter for playback.

The ISD4004-12MED can be used for many different applications such as voice recognition, voice output systems, speech synthesis, and audio recording. It is also well suited for applications that require playback of pre-recorded audio, such as voice prompting systems and interactive voice response (IVR) systems. The chip can store up to 2K bytes of compressed or uncompressed audio data, which is enough to store up to 120 seconds of mono-channel audio.

The ISD4004-12MED is a versatile non-volatile memory device that is easy to use. It features a low-voltage programming mode, as well as a low-power playback mode, which makes it ideal for battery-powered devices. The device also features a flexible programming interface, allowing for quick and easy access to the chip\'s contents. Additionally, the device includes on-chip error correction and power fail detection, ensuring data integrity and preventing audio distortion.

The device is interfaced to the rest of the system using a four-wire serial bus. The serial bus provides control signals for programming and playback. It also contains control signals for initiating playback, pausing or stopping playback, setting the playback rate, and setting the playback volume. The serial bus can transfer data at up to 50 kilo bits per second, making the device suitable for live audio playback applications.

The ISD4004-12MED has two modes of operation: Record Mode and Playback Mode. In Record mode, the chip is used to capture incoming audio data and store it in its memory. The captured data is organized into a series of 16-bit words that can be accessed and manipulated by the user. The chip can store up to 12K bytes of data, which is enough to store up to 120 seconds of mono speech or 60 seconds of stereo quality audio.

In Playback Mode, the chip is used to play back the data stored in its memory. The device can play data at any speed from 8K to 32K words per second. The playback rate and volume can be controlled using a separate interface. The device also contains on-chip error correction and power-fail detection, ensuring that stored data is always played back accurately.

The ISD4004-12MED is a versatile, low-power audio recording and playback device well suited for a variety of applications. Its small size, low power consumption, and easy-to-use interface make it an ideal choice for many audio-related projects. With its advanced features, it is well suited for voice recognition, speech synthesis, playback of pre-recorded audio, and other audio-related applications.

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