ISD1700A SERIES
1 GENERAL DESCRIPTION
The Winbond
®
ISD1700A ChipCorder
®
Series is a high quality, fully integrated, single-chip multi-
message voice record and playback device ideally suited to a variety of electronic systems. The
message duration is user selectable in ranges from 26 seconds to 120 seconds, depending on the
specific device. The sampling frequency of each device can also be adjusted from 4 kHz to 12 kHz
with an external resistor, giving the user greater flexibility in duration versus recording quality for each
application. Operating voltage spans a range from 2.4 V to 5.5 V to ensure that the ISD1740A/50A/60A
devices are optimized for a wide range of battery or line-powered applications.
The ISD1740A/50A/60A devices incorporate a proprietary message management system that allows
the chip to self-manage address locations for multiple messages. This unique feature provides
sophisticated messaging flexibility in a simple push-button environment. The devices include an on-
chip oscillator (with external resistor control), microphone preamplifier with Automatic Gain Control
(AGC), an auxiliary analog input, anti-aliasing filter, Multi-Level Storage (MLS) array, smoothing filter,
volume control, Pulse Width Modulation (PWM) Class D speaker driver, and current output.
The ISD1740A/50A/60A devices also support an optional “vAlert” (voiceAlert) feature that can be used
as a new message indicator. With vAlert, the IC strobes an external LED to indicate that a new
message is present. Four special sound effect locations are reserved for audio confirmation of
commands, such as “Start Record”, “Stop Record,” and “Erase.”
Recordings are stored in on-chip Flash memory cells, providing zero-power message storage. This
unique single-chip solution is made possible through Winbond’s patented Multi-Level Storage (MLS)
technology. Audio data are stored directly in solid-state memory without digital compression, providing
superior quality voice and music reproduction.
Voice signals can be fed into the chip through two independent paths: a differential microphone input
and a single-ended analog input. For outputs, the ISD1740A/50A/60A devices simultaneously provide
a Pulse Width Modulation (PWM) Class D speaker driver and a separate current output. The PWM can
directly drive a standard 8
Ω
speaker or a typical buzzer, while the separate single-ended current
output can drive an external amplifier.
The ISD1740A/50A/60A devices automatically enter into power down mode for power conservation
when an operation is completed.
Notice: The specifications are subject to change without notice. Please contact Winbond Sales Offices
or Representatives to verify current or future specifications.
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