ISD2532P View Datasheet(PDF) - Information Storage Devices

Part Name

Description

Manufacturer

ISD2532P

Single-Chip Voice Record/Playback Devices 32-*, 40-*, 48-*, 64-*, 60-, 75-, 90-, and 120-Second Durations

Information Storage Devices 

Product Data Sheets

ISD2500 Series

APPLICATION EXAMPLE – PASSIVE COMPONENT FUNCTIONS

Part

R1

R2

R3, R5

R4

Function

Microphone power supply

decoupling

Release time constant

Microphone biasing resistors

Series limiting resistor

R6

C1, C5

Series limiting resistor

Microphone DC–blocking capacitor

Low-frequency cutoff

C2

C3

C4

C6, C7, C8

Attack/Release time constant

Low-frequency cutoff capacitor

Microphone power supply

decoupling

Power supply capacitors

Comments

Reduces power supply noise

Sets release time for AGC

Provides biasing for microphone operation

Reduces level to prevent distortion at higher supply

voltages.

Reduces level to high supply voltages

Decouples microphone bias from chip. Provides single-

pole low-frequency cutoff and common mode noise

rejection.

Sets attack/release time for AGC

Provides additional pole for low-frequency cutoff

1

Reduces power supply noise

Filter and bypass of power supply

EXPLANATION

In this simplified block diagram of a microcontroller

application, the Push-Button mode and message

cueing are used. The microcontroller is a 16-pin

version with enough port pins for buttons, an LED,

and the ISD2500 Series device. The software can

be written to use three buttons: one each for play

and record, and one for message selection.

Because the microcontroller is interpreting the but-

tons and commanding the ISD2500 device,

software can be written for any functions desired in

a particular application.

NOTE

ISD does not recomend connecting

address lines directly to a microprocessor

bus. Address lines should be externally

latched.

* Advance information: ISD2532/40/48/64 devices.

1–101

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