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PT2399 Digital Delay Echo Audio Processor

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The PT2399 is an Echo Processor IC that is commonly used to provide digital delay in audio circuits. The IC takes in analog audio input and converts it into digital stream of bits to add a digital delay to it. This audio delayed audio signal is then provided as output.

 

Pin Configuration

Pin Number

Pin Name

Description

1

VCC

Supply Voltage Input

2

REF

Analog Reference Voltage Input

3,4

AGND, DGND

Analog Ground and Digital Ground

5

CLK_O

Clock Signal Output

6

VCO

Frequency adjust input pin

7,8

CC1,CC0

Current control 1 and Current control 0

9,10

OP1-OUT,OP1-IN

1st Op-amp Output and input pin

11,12

OP2-IN,OP2-OUT

2nd Op-amp Input and Output pin

13,14

LPF2-IN,LPF2-OUT

2nd Low pass filter input and output pin

15,16

LPF1-OUT,LPF-IN

1st Low pass filter output and input pin

 

Features

  • Audio Echo Processor for digital delay 
  • Supply Voltage: 4.5V to 5.5V
  • Clock Frequency: 4MHz
  • Maximum Voltage gain: 2.5dB
  • Power Supply Rejection Ratio: -40dB (typically) 
  • Available in 16-pin PDIP, GDIP, PDSO packages

Note: Complete Technical Details can be found at the datasheet give at the end of this page.

 

Alternatives Echo Audio Processor IC: BU9253,

 

Introduction to PT2399

The PT2399 is an age old Echo Processor IC from a manufacturer called Princeton. The IC has been extensively used in audio application to create digital delays and other modulations. It can commonly be found in Karaoke mixers and other toys requiring audio modulations. A sample application circuit for the IC is show below from the datasheet.

PT2399 Digital Delay Echo Audio Processor Circuit

 

The IC is originally from Taiwan (China) and hence most of the passive components (mainly capacitors) used in the application circuit will not available globally. But since the values are not operation sensitive you can try using a close value as possible. The IC works with CMOS technology and claims to have a very low distortion value of less than 0.5%. But still many designers have reported a mild fizzing noise during operation. Irrespective of the drawbacks the IC is still widely used in audio consoles for echo purposes. More details can be found at the datasheet linked at the bottom of this page.

 

Application

  • Audio processing application
  • Echo creator
  • Karaoke Mixer
  • Entertainment/Infotainment system
  • Electronics toys

 

2D Model of PT2399 (PDIP)

PT2399 Digital Delay Echo Audio Processor IC Dimension

Component Datasheet