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Princeton Technology Corp
Princeton Technology Corp

PT2395 Datasheet

Enhanced Digital Echo IC


PT2395 Datasheet Preview


Princeton Technology Corp.
Enhanced Digital Echo IC
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2395
DESCRIPTION
PT2395 is a silicon gate CMOS-processed digital echo IC functionally compatible with M50195P.
Input signal to PT2395 is converted to digital signal with A-D conversion then stored in the memory
(DRAM) chip. After a certain delay time, digital signal is read out from the memory chip and then
converted back into analog signal using the D-A conversion. A low cost echo system may thus be
achieved with PT2395’s A-D converter, D-A converter, incorporating ADM algorithm, while main-
taining lower noise, lower distortion, higher S/N ratio as compared to the conventional BBD (Bucket
Brigate Device). PT2395 further features enhanced functions such as continuous delay time with
external VR (Variable Resistor), 256 K DRAM support for longer delay time (Extended Delay Mode,
up to 800 ms at 4 MHz Clock) as compared to M50195P. Moreover, the distortion and the S/N Ratio
are further improved.
FEATURES
• CMOS Technology
• Available in 40-pin PDIP Package (600 mil)
• Low Noise, Low Distortion Echo System
• 3-Level Delay Time Selectable, with Indicator Output
• On-chip RC Oscillator for Continuous Delay Time
• 64K/256K DRAM chip support
• Extended Delay Mode up to 800 ms Delay Time (without VR)
• Create fascinating echo effect with time delay
APPLICATIONS
• KARAOKE
• Radio Set
• Video Disc Player
• Electronic Musical Instrument
Ref. No. 2395 v1.1
1
Written Dec. 1998
Page 1

Princeton Technology Corp.
Enhanced Digital Echo IC
BLOCK DIAGRAM
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2395
PIN CONFIGURATION
A8
A6
MDI
CAS
RESET
DO
W
RAS
A0
A2
A1
A7
A5
A4
A3
D-GND
CC1
CC2
SHORT
SEL
PT2395
Ref. No. 2395 v1.1
2
NC
Vcc
LPF202
LPF201
LPF2I1
LPF212
OP2O
OP21
A-GND
LPF-1I
LPF1O
OP1O
OP1I
REF
OSCI
OSCO
OSCX
LONG
MIDD
CDI
Written Dec. 1998
Page 2

Princeton Technology Corp.
Enhanced Digital Echo IC
APPLICATION CIRCUIT
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2395
Ref. No. 2395 v1.1
10
Written Dec. 1998
Page 3
Part Number PT2395
Manufactur Princeton Technology Corp
Description Enhanced Digital Echo IC
Total Page 4 Pages
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