Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Digital Echo/Surround Processor IC
PT2396
DESCRIPTION
PT2396 is a digital echo/surround processor IC utilizing CMOS Technology. Analog Signal inputted to
PT2396 is converted to digital signal by A-D converter and then stored into the internal memory. After
a certain delay time, this memory-stored digital signal is converted back into analog signal via the D-A
converter.
A low cost echo system may be achieved with the PT2396's A-D converter, D-A converter,
incorporating ADM (Adaptive Delta Modulation) Algorithm while maintaining lower noise, lower
distortion, and higher S/N ratio.
PT2396 is functionally compatible with M65831P. If you are replacing M65831P with our PT2396, you
must take note that PT2396 does not need to connect an external resistor (30Ω) to Pin 15 and Pin 21.
FEATURES
•
•
•
•
•
•
•
•
•
CMOS technology
Low power consumption
Low noise (-92dBV typical)
Low distortion (0.5% typical)
Built-in 48K memory
Automatic reset circuit included
A-D, D-A converters (Adaptive delta modulation), 2 LPFs and 48 K-bit memory
Sleep mode function
Parallel or serial data controlled from micro controller
APPLICATIONS
•
•
•
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KARAOKE
Electronic musical instruments
VCD, DVD
Radio set
PT2396 V1.4
-1-
December, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Digital Echo/Surround Processor IC
PT2396
PIN CONFIGURATION
VD D
OSCI
OSCO
DL1/R EQ
DL2/C LK
DL3/D IN
DL4/IDS
T EST
EA SY/(/MCU )
1
2
3
4
5
6
7
8
9
24
23
22
20
VC C
LPF 1IN
LPF 1OU T
OP1IN
RE F
CC1
CC2
OP2IN
OP2OUT
LPF 2IN
LPF 2OU T
21 OP1OUT
19
18
17
16
15
14
13
PT23 96
SLEE P 10
DGND 11
AGND 12
PT2396 V1.4
-2-
December, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Digital Echo/Surround Processor IC
PT2396
PIN DESCRIPTION
Pin Name
VDD
OSCI
OSCO
DL1/REQ
DL2/CLK
DL3/DIN
DL4/IDS
TEST
EASY/(/MCU)
SLEEP
DGND
AGND
LPF2OUT
LPF2IN
OP2OUT
OP2IN
CC2
I/O
-
I
O
I
I
I
I
I
I
I
-
-
O
I
O
I
-
Description
Digital supply voltage
Oscillator input pin
This pin connects to 2MHz ceramic resonator or inputs an
external clock.
Oscillator output pin
This pin connects to 2MHz ceramic resonator.
Delay1/Request pin
Easy Mode: This pin inputs DL1 data.
MCU Mode: This pin inputs request data.
Delay2/Shift clock pin
Easy Mode: This pin inputs DL2 data.
MCU Mode: This pin inputs shift clock.
Delay 3/Serial data pin.
Easy Mode: This pin inputs DL3 data.
MCU Mode: This pin inputs serial data.
Delay 4/ID switch pin
Easy Mode: This pin inputs DL4 data.
MCU Mode: This pin controls ID Code.
Test pin
Normal mode = Low
EASY/(/MCU) pin.
EASY mode = High
MCU mode = Low
Sleep pin
Sleep mode = High
Normal mode = Low
Digital GND pin
This pin connects to the Analog GND at one external
point.
Analog GND pin
This pin connected to the Analog GND
These pins form the low
Low Pass Filter 2 output pin
pass filter with external
Low Pass Filter 2 Input pin
C, R.
These pins form the
OP-AMP2 output pin
integrator with external
OP-AMP2 input pin
C, R.
Current control 2 pin
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
PT2396 V1.4
-3-
December, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Digital Echo/Surround Processor IC
Pin Name
CC1
REF
OP1IN
OP1OUT
LPF1OUT
LPF1IN
VCC
I/O
-
-
-
I
O
O
I
Description
Current control 1 pin.
Reference pin.
Reference voltage = 1/2 VCC
OP-AMP 1 input pin
OP-AMP 1 output pin.
Low pass filter 1 output pin
Low pass filter 1 input pin
Analog supply voltage pin
PT2396
Pin No.
18
19
These pins form the
integrator with external
C, R.
These pins form the
low pass filter with
external C, R.
20
21
22
23
24
PT2396 V1.4
-4-
December, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Digital Echo/Surround Processor IC
PT2396
FUNCTIONAL DESCRIPTION
DELAY TIME
EASY MODE
The Easy Mode is activated when the EASY/(/MCU) Pin is in HIGH State. Under the Easy Mode;
namely – DL1/REQ, DL2/CLK, DL3/DIN, and DL4/IDS are all used as inputs for Delay Time Data (DL1
~ DL4).
The Delay Pins: namely -- DL1~DL4 determine the amount of time the memory-stored signal would be
stored in the 48 K-bit memory (delay time). The following table gives the various Delay Time with
reference to the Pins DL1 ~ DL4.
fs
DL4
DL3
L
H
500
L
L
H
H
L
L
H
250
H
L
H
H
Notes:
1. fs - sampling frequency (KHz)
2. Td = Delay Time (msec)
DL2
L
DL1
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
Td (ms)
12.3
24.6
36.9
49.2
61.4
73.7
86.0
98.3
110.6
122.9
135.2
147.5
159.7
172.0
184.3
196.6
PT2396 V1.4
-5-
December, 2005
Microchip MCU
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