PT2399 Digital Delay Echo Audio Processor

2 July 2019 - 0 Comments

PT2399 Digital Delay Echo Audio Processor

PT2399 Pinout

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.

PT2399 Pinout 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 in the PT2399 datasheet, given at the end of this page.

Alternatives

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 shown below from the datasheet.

PT2399 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.