ISD2500 ETC1 [List of Unclassifed Manufacturers], ISD2500 Datasheet - Page 2

• Manufacturer Part Number: ISD2500
• Description: Single-Chip Voice Record/Playback Devices 32-, 40-, 48-, 64-,60-,75,90-, and 120-Second Durations
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

-1
ISD2500 Series
GENERAL DESCRIPTION
Information Storage Devices' ISD2500 Chip-
Corder
Record/Playback solutions for 32- to 120-second
messaging applications. The CMOS devices
include an on-chip oscillator, microphone pream-
plifier, automatic gain control, antialiasing filter,
smoothing filter, speaker amplifier, and high den-
sity multi-level storage array. In addition, the
ISD2500 is microcontroller compatible, allowing
complex messaging and addressing to be
achieved.
Recordings are stored in on-chip nonvolatile mem-
ory cells, providing zero-power message storage.
This unique, single-chip solution is made possible
through ISD's patented multilevel storage technol-
ogy. Voice and audio signals are stored directly
into memory in their natural form, providing high-
quality, solid-state voice reproduction.
1–80
ISD2560/75/90/120 DEVICE BLOCK DIAGRAM
ANA OUT
MIC REF
ANA IN
XCLK
AGC
MIC
®
Series provides high-quality, single-chip
*
Advance information: ISD2532/40/48/64 devices.
V
CCA
Power Conditioning
Amp
Pre-
V
SSA
Amp
V
SSD
Gain Control
Automatic
Internal Clock
(AGC)
V
CCD
Antialiasing Filter
A0
5-Pole Active
A1
A2 A3 A4 A5
Address Buffers
Timing
Analog Transceivers
Multilevel Storage
A6
Sampling Clock
Nonvolatile
480 K Cell
A7 A8 A9
To meet end system requirements, the ISD2500
Series offers single-chip solutions at 32*, 40*, 48*,
64 *, 60, 75, 90, and 120 seconds. Parts may also
DETAILED DESCRIPTION
Speech/Sound Quality
The ISD2500 Series includes devices offered 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 within a product
series decreases the sampling frequency and
bandwidth, which affects sound quality. Please
refer to the ISD2500 Series Summary table on
page 1-79 to compare 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.
Direct analog storage provides a very true, natural
sounding reproduction of voice, music, tones, and
sound effects not available with most solid-state
digital solutions.
Duration
be cascaded together for longer durations.
Array
PD
Smoothing Filter
OVF P/R
Device Control
5-Pole Active
CE EOM
Mux
Product Data Sheets
AUX IN
Amp
R
SP–
SP+