isd3900 Winbond Electronics Corp America, isd3900 Datasheet - Page 3

• Manufacturer Part Number: isd3900
• Description: Multi-message Record/playback Devices With Digital Audio Interface
• Manufacturer: Winbond Electronics Corp America

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The ISD3900 is a multi-message ChipCorder
management, 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. The ISD3900 utilizes winbond 25X/25Q series flash memory to
provide non-volatile audio record/playback for a two-chip solution. Unlike other ChipCorder series, the
ISD3900 provides an I
and a signal path with SNR equivalent to 12bit resolution.
The ISD3900 can take digital audio data via I
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 ISD3900 supported sample rates.
The ISD3900 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
External Memory: support winbond 25X/25Q SpiFlash.
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Fast Digital Programming
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Message Management
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Sample Rate
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Compression Algorithms
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GENERAL DESCRIPTION
The addressing ability of ISD3900 is up to 128Mbit, which is 64-minute recording time based
on 8kHz/4bit ADPCM.
Programming rate can go up to 1Mbits/second mainly limited by the flash memory write rate.
Perform address-free recording: The ISD3900 allocates memory for new recording requests
and upon completion, returns a start address to the host via SPI interface
Store pre-recorded audio (Voice Prompts) using high quality digital compression
Use a simple index based command for playback
Execute pre-programmed macro scripts (Voice Macros) designed to control the configuration
of the device and play back Voice Prompts sequences and message recordings.
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.
For I
playback sampling frequencies scaling accordingly.
For recording
ADPCM: 2, 3, 4 or 5 bits per sample
µ-Law: 6, 7 or 8 bits per sample
Differential µ-Law: 6, 7 or 8 bits per sample
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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S operation, 32, 44.1 and 48kHz master sample rates are available with record and
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S digital audio interface, faster digital recording, higher sampling frequency,
®
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featuring digital compression, comprehensive memory
S or SPI interface. When I
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Publication Release Date: July 1, 2010
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S input is selected, it will
ISD3900
Revision 1.0