ISD1700A SERIES

- 4 -

1 GENERAL DESCRIPTION

The Winbond

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.