PTC
Princeton Technology Corp.
4 Mode Preset Equalizer IC
Tel : 886-2-29162151
Fax : 886-2-29174598
Preliminary
PT 2380
Description
PT 2380 is a pre-set equalizer IC utilizing CMOS Technology specially designed for
audio equipment. It features four sound selections, namely: Classical, Pops, Rock
and Normal/Flat which may be selected by the 2 control pins (SW1 and SW2).
PT 2380 has 2 built-in channels - each containing an internal operation amplifier and
selectable resistors. Thus, least external components are used. By connecting only 3
capacitors to each channel, the high performance pre-set equalizing function of this
IC is achieved. Pin assignments and application circuit are optimized for easy PCB
layout and cost saving for audio applications. PT 2380 is housed in a 16-Pin DIP or
SO Package and is suitable for stereo sound applications.
Features
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CMOS Technology
Least External Components
Available in 16 Pins, DIP or SO Package
4 Sound Effect Selections Available: Classical, Pops, Rock, and Normal/Flat
High Operating Voltage Range: Vcc = 5 ~ 15 V
Two Channels in the same chip
Can be controlled by Micro-Processor Output Pin
Applications
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Mini Compo
Car Stereo
Radio Cassette Recorders
Multi-Media Speaker
MPEG Card
Other Audio Equipments
Page 1
Preliminary 2
Revised Jan. 1996
PTC
Princeton Technology Corp.
4-Mode Preset Equalizer IC
Tel : 886-2-29162151
Fax : 886-2-29174598
Preliminary
PT 2380
Block Diagram
where: N = Normal/Flat Mode
P = Pops Mode
C = Classic Mode
R = Rock Mode
Figure 1:
PT2380 Block Diagram
Page 2
PTC
Princeton Technology Corp.
4-Mode Preset Equalizer IC
Tel : 886-2-29162151
Fax : 886-2-29174598
Preliminary
PT 2380
Pin Configuration
Figure 2:
PT2380 Pin Configuration
Pin Description
Pin
Name
IN1
OUT1
Cap1_1
Cap1_2
NF1
Cap1_3
Vcc
GND
SW1
SW2
Cap2_3
NF2
Cap2_2
Cap2_1
OUT2
IN2
I/O
I
O
-
-
-
-
-
-
I
I
-
-
-
-
O
I
Description
Signal Input Pin 1
Signal Output Pin 1
This pin is connected to Pin 5 by an external Capacitor
This pin is connected to Pin 5 by an external Capacitor.
Feedback Node 1
This pin is connected to Pin 5 by an external Capacitor.
Positive Power Supply
Ground
Mode Switch 1
Mode Switch 2
This pin is connected to Pin 12 by an external Capacitor.
Feedback Node 2
This pin is connected to Pin 12 by an external Capacitor.
This pin is connected to Pin 12 by an external Capacitor.
Signal Output Pin 2
Signal Input Pin 2
Page 3
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PTC
Princeton Technology Corp.
4-Mode Preset Equalizer IC
Tel : 886-2-29162151
Fax : 886-2-29174598
Preliminary
PT 2380
Functional Description
PT2380 is pre-set to 4 modes: Normal/Flat, Rock, Classical and Pops. These 4
modes may be selected using two switches, namely: SW1 (Pin. No.9) and SW2 (Pin
No.10). Please refer to the table below.
Mode
Normal/Flat
Rock
Classic
Pops
SW1
Low
Low
High
High
SW2
Low
High
Low
High
where Low: SW1/SW2
≤
1V and High: SW1/SW2
≥
3.5V for Vcc = 5 ~ 12 V
Table 1:
SW1 & SW2 Mode Conditions
The Output Voltage Gain vs. the Frequency Graph for the 4 preset modes is given
below:
Output Voltage Gain vs. Frequency
24
Output Voltage Gain Gv (dB)
22
20
18
16
14
12
10
10
100
1000
Frequency f (Hz)
Figure 3:
PT 2380 Output Voltage Gain vs. Frequency Graph
Page 4
10000
100000
Normal
Pops
Classic
Rock
PTC
Princeton Technology Corp.
4-Mode Preset Equalizer IC
Tel : 886-2-29162151
Fax : 886-2-29174598
Preliminary
PT 2380
In order to best describe this IC, an application example is hereby given. The
application example’s electrical characteristics are enumerated below.
Conditions: Vcc = 12.0 V, Vi = 0.1 Vrms and f = 1 KHz
Symbol
Icc
GBn
GMn
GTn
GBr
GMr
GTr
GBc
GMc
GTc
GBp
GMp
GTp
VOM
Parameter
Circuit Operation Current
Normal Mode
Voltage
Gain
Rock Mode
Voltage
Gain
Classic Mode
M
Voltage
O
Gain
Pops Mode
D
E
Voltage
Gain
Maximum Output
Voltage
P
R
E
S
E
T
Total Harmonic
Distortion
Output Noise
Voltage
Input Resistor
Bass
Mid
Treble
Bass
Mid
Treble
Bass
Mid
Treble
Bass
Mid
Treble
Condition
Vcc=12.0 V
Vi =0.0 V
f=80Hz
f=1KHz
f=10KHz
f=80Hz
f=1KHz
f=10KHz
f=80Hz
f=1KHz
f=10KHz
f=80Hz
f=1KHz
f=10KHz
f=1KHz
Vcc=5V,Vi=0.3Vrms
Vcc=12V,Vi=0.8Vrms
BW=400Hz~30KHz
A-Weighting
BW=400Hz~30KHz
A-Weighting, Vi=0.0V
Data
8.0
14
14
14
20
14
16
16
14
16
12
16
14
1.5
4.0
0.02
50
50
Unit
mA
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Vrms
THD
VNO
Ri
%
µVrms
kΩ
Table 2:
Application Example Electrical Characteristic Values
Page 5
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