ISD5008E datasheet(4/47 Pages) ETC

Part #	ISD5008E

Description	SINGLE CHIP VOICE RECORD PLAYBACK DEVICE 4-, 5-, 6-, AND 8- MINUTE DURATIONS

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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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