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Voice Recorder/Playback Module using ISD1760

ISD1760 is a small Voice Recorder/Playback module that can do the multi-segment recording. The user can achieve a high quality of recording for each application with the adjustment of the on-board resistor (4k to 12k). This Voice Recorder/Playback module is designed to operate in two-mode standalone or microcontroller-based SPI mode. Additionally, it has a special feature that is vAlert (voice alert), which can be used as a message indicator, such as Start Record, Stop Record, Erase, Forward, Global Erase, etc.


Pin Description of ISD1760 Voice Recorder/Playback Module

Pin Name



LED turns on during recording and blinks LED during playback, forward, and erase operations


RST input is Low, the device enters into a known state and initializes all pointers to the default state.




2.4V - 5.5V (5.0V Nominal)


Master In Slave Out: Data is shifted out on the falling edge of SCLK.


Master Out Slave In: In SPI slave mode, data is latched into the device on the rising edge of SCLK. 


Serial Clock: Clock of the SPI interface.


Slave Select: This input, when low, selects the device as a slave device and enables the SPI interface.




AnaIn: Auxiliary analog input to the device for recording or feed-through.


Microphone signal Input


Speaker(-): The negative Class D PWM provides a differential output with SP+ pin to directly drive an 8 Ω speaker


Speaker(+): The positive Class D PWM provides a differential output with the SP- pin to directly drive an 8 Ω speaker


Auxiliary Output: Depending upon the D7 of APC register, this output is either an AUD or AUX output. AUD is a single-ended current output, whereas AUX is a single-ended voltage output.




2.4V - 5.5V (5.0V Nominal)


Volume: This control has 8 levels of volume adjustment.


Feed-through: In Standalone mode, when FT is engaged low, the AnaIn feed-through path is activated.


Playback: Pulsing PLAYto Low once initiates a playback operation.


Record: The device starts recording whenever REC switches from High to Low and stays at Low.


Erase: When active, it starts an erase operation.


Forward: When triggered, it advances to the next message from the current location, when the device is in power-down status.


Note: Complete technical details can be found in the ISD1760 Datasheet linked at the bottom of this page. A complete technical design guide can be found in the ISD1760 Design Guide.


Alternatives for ISD1760: ISD1820, ISD1700


Features of ISD1760 Voice Recorder/Playback Module

  • Operating Voltage: Wide power supply ranges from 2.4V to 5.5V DC
  • Dual operating modes: Standalone mode and SPI mode
  • Two individual input channels
  • MIC input with AGC (Automatic Gain Control)
  • AnaIn (Analog input)
  • Dual output channels
  • Differential PWM Class D speaker outputs
  • Configurable AUD (current) or AUX (voltage) single-ended output
  • Non-volatile message storage using multi-level storage (MLS)
  • High-quality, natural voice, and audio reproduction
  • Integrated message management systems for single-chip, push-button applications
  • Dimensions(LxWxH) in cm 6 x 6 x 2


ISD1760 Voice Recorder/Playback Module - Overview

The main Voice Recorder/Playback IC is ISD1760.

 ISD1760 Voice Recorder Module

This ISD1760 Voice Recorder/Playback Module reproduces high-quality, natural voice and audio from the recorded audio by Mic or SPI or Analog Input. Because of its dual operation mode (Standalone and SPI), we can easily use this as per requirement and with a slight change of the onboard resistor, we can get flexibility in the sampling frequency of the recording duration & quality.

Sample Frequency


12 kHz

40 Secs

8 kHz

60 Secs

6.4 kHz

75 Secs

5.3 kHz

90 Secs

4 kHz

120 Secs

In this module, Voice signals can be fed through two independent paths, namely, a differential microphone input or a single-ended analog input. For outputs, the module provides a Pulse Width Modulation (PWM) Class D speaker driver and a separate analog output simultaneously. The PWM can directly drive a standard 8Ω speaker or typical buzzer, while the separate analog output can be configured as a single-ended current or voltage output to drive an external amplifier.


Interfacing diagram

The ISD1760 based voice recorder and playback module can easily be controlled using any microcontroller like PIC, Arduino, etc. via SPI communication protocol.

ISD1760-Microcontroller Interfacing Diagram 


Application of ISD1760 Voice Recorder/Playback

  • Voice Recorder
  • Microcontroller based audio playback
  • Sound recorder


2D Model

The dimensions of the ISD1760 Module is shown below.

 ISD1760 Dimensions

Component Datasheet

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