ISD15100 SERIES

Publication Release Date: May 6, 2011

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Revision 1.3

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GENERAL DESCRIPTION

The ISD15100 series is a multi-message ChipCorder

memory management, flash storage, and integrated analog/digital audio signal paths. The message

management feature is designed to make message recording simple and address-free as well as

make code development easier for playback-only applications. This family utilizes flash memory to

provide non-volatile audio record/playback with durations up to 16 minutes for a single-chip solution.

Unlike other ChipCorder series, the ISD15100 series provides an I

digital recording, higher sampling frequency, and a signal path with SNR equivalent to 12bit resolution.

The ISD15100 series can take digital audio data via I

will replace the analog audio inputs and will support sample rates of 32, 44.1 or 48 kHz depending

upon clock configuration. When SPI interface is chosen, the sample rate of the audio data sent must

be one of the ISD15100 supported sample rates.

The ISD15100 series has built-in analog audio inputs, analog audio line driver, and speaker driver

output. The two analog audio inputs to the device are: (1) AUXIN has a fixed gain configured by SPI

command, and (2) ANAIN/ANAOUT has a fixed gain amplifier with the gain set by two external

resistors.

ANAIN/ANAOUT can also be used as a microphone differential input (ANAIN/ANAOUT

becomes MIC+/MIC-) in conjunction with an automatic gain control (AGC) circuit configured by SPI

command. Analog outputs are available in three forms: (1) AUXOUT is a single-ended voltage output;

(2) AUDOUT can be configured as either a single-ended voltage output or a single-ended current

output; (3) BTL (bridge-tied-load) is a differential voltage output.

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FEATURES



Fast Digital Programming

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Programming rate can go up to 1Mbits/second mainly limited by the flash memory write rate.

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Duration

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2 to 16 minutes based on 8kHz/4bit ADPCM



Message Management

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Perform address-free recording: The ISD15100 allocates memory for new recording requests

and upon completion, returns a start address to the host via SPI interface

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Store pre-recorded audio (Voice Prompts) using high quality digital compression

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Use a simple index based command for playback

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Execute pre-programmed macro scripts (Voice Macros) designed to control the configuration

of the device and play back Voice Prompts sequences and message recordings.



Sample Rate

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Seven record and playback sampling frequencies are available for a given master sample

rate. For example, the record and playback sampling frequencies of 4, 5.3, 6.4, 8, 12.8, 16

and 32kHz* are available when the device is clocked at a 32kHz master sample rate.

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For I

playback sampling frequencies scaling accordingly.



Compression Algorithms

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For recording



ADPCM: 2, 3, 4 or 5 bits per sample

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µ-Law: 6, 7 or 8 bits per sample

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Differential µ-Law: 6, 7 or 8 bits per sample

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PCM: 8, 10 or 12 bits per sample. Each sampled value is stored as a code, offering no

compression but preserving maximum resolution

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For Pre-Recorded Voice Prompts