Ref. No. 2390 v1.1

1

Written July 1999

Princeton Technology Corp.

Tel: 886-2-29162151

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT2390

Echo IC with Built-in Microphone Amplifier & Output Mixer

DESCRIPTION

PT2390 is a digital echo IC utilizing CMOS Technology. Microphone Amplifier, Output Mixer, internal

44K RAM and Vocal Switch are all integrated in a single chip to provide a digital echo IC of the the highest

standard. Very low distortion and high S/N Ratio qualities, not to mention the built-in VCO feature which

eliminates the need for an external crystal oscillator are just some of the features of PT2390. Pin assign-

ments and application circuit are optimized for easy PCB Layout and low cost effectiveness.

FEATURES

• CMOS Technology

• Least External Component

• 5V Power Supply

• 2 Microphone Amplifier and KARAOKE Automatic Vocal Changer

• Built-in 44K RAM

• Built-in VCO, eliminating the need for a crystal oscillator

• Low Total Harmonic Distortion

: Microphone Pre-Amplifier <0.09% (typ.)

: Echo Processor < 0.5% (typ.)

• High S/N Ratio

: Microphone Pre-Amplifier > 85 (no - weighting)

: Echo Processor > 80 dB (no - weighting)

• Available in 28-pin, DIP or SO Package

APPLICATIONS

• DVD, VCD

• KARAOKE

• VCR

• Mini Compo

• Other Audio Equipments