PT2399
Echo Processor IC
DESCRIPTION
The PT2399 is a single chip echo processor IC utilizing
CMOS technology. Which accept analog audio input
signal, a high sample rate ADC transfer the analog
signal into a bit stream then storage to internal 44Kbit
RAM, after processing the bit stream will de-modulate
by DAC and lowpass filter. Overall delay time is
determined by internal VCO clock frequency, and user
can easy to change the VCO frequency by changing
the external resistance. The PT2399 performs low
distortion (THD<0.5%@0.5Vrms) and low noise
(No<-90dBV) characteristic for audio purpose, and pin
arrangement and application circuit are optimized for
easy PCB layout and cost saving advantage.
FEATURES
•
•
•
•
•
•
CMOS technology
Least external components
Auto reset Function prevent POP noise
Low noise, SNR better than 90dB (typical)
Low distortion, THD= 0.5%(typical)
User adjustable VCO clock frequency.
APPLICATIONS
•
•
•
•
•
•
KARAOKE Mixer
CD/DVD Player/Recorder
Multimedia TV
Car Entertainment System
Music Instrument effecter
Electronics Toy
BLOCK DIAGRAM
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT2399
APPLICATION CIRCUIT
ECHO
Note:
External Resistor having a value of 10 KΩ to 50 KΩ may be used. The recommended Resistor Value(R) is 10 KΩ. When the value of the Resistor (R)
increases, the range of the Delay Time also increases.
SURROUND/DELAY
Note: Please refer to Table 1 for the Resistor/Delay Time values.
V1.6
2
February 2010
PT2399
ORDER INFORMATION
Valid Part Number
PT2399
PT2399S
PT2399-SN
Package Type
16 Pins, DIP, 300mil
16 Pins, SOP, 300mil
16 Pins, SOP, 150mil
Top Code
PT2399
PT2399S
PT2399-SN
PIN CONFIGURATION
PIN DESCRIPTION
Pin Name
VCC
REF
AGND
DGND
CLK_O
VCO
CC1
CC0
OP1-OUT
OP1-IN
OP2-IN
OP2-OUT
LPF2-IN
LPF2-OUT
LPF1-OUT
LPF1-IN
I/O
-
-
-
-
O
I
-
-
O
I
I
O
I
O
O
I
Description
Analog supply voltage input
Analog reference voltage (1/2VCC)
Analog ground
Digital ground
System clock output pin
VCO Frequency adjustment
Current control 1
Current control 0
OP amplifier 1 input/output. This pin can be used as
modulated/Demodulated integrator by connecting capacitor
OP Amplifier 2 input/output. This pin can be used as
Modulated/Demodulated Integrator by connecting Capacitor
Low pass filter 2 input/output pin
Low pass filter 1 input/output pin
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V1.6
3
February 2010
PT2399
FUNCTION DESCRIPTION
ECHO MODE
Please refer to the diagram below:
AUTO RESET FUNCTION
The waveform of the signal during power on is given below:
TABLE 1: VCO FREQUENCY VS DELAY TIME
R
fck
td
THD
R
fck
td
THD
R
fck
td
THD
R
fck
td
THD
27.6K
2.0M
342ms
1.0%
7.2K
6.0M
113.7ms
0.29%
2.8K
11M
61.6ms
0.18%
723
19M
36.6ms
0.14%
21.3K
2.5M
273ms
0.8%
6.4K
6.5M
104.3ms
0.27%
2.4K
12M
56.6ms
0.16%
519
20M
34.4ms
0.13%
17.2K
3.0M
228ms
0.63%
5.8K
7.0M
97.1ms
0.25%
2K
13M
52.3ms
0.15%
288
21M
32.6ms
0.13%
14.3K
3.5M
196ms
0.53%
5.4K
7.5M
92.2ms
0.25%
1.67K
14M
48.1ms
0.15%
0.5
22M
31.3ms
0.13%
12.1K
4.0M
171ms
0.46%
4.9K
8.0M
86.3ms
0.23%
1.47K
15M
45.8ms
0.15%
10.5K
4.5M
151ms
0.41%
4.5K
8.5M
81ms
0.22%
1.28K
16M
43ms
0.15%
9.2K
5.0M
136.6ms
0.36%
4K
9.0M
75.9ms
0.21%
1.08K
17M
40.6ms
0.14%
8.2K
5.5M
124.1ms
0.33%
3.4K
10M
68.1ms
0.19%
894
18M
38.5ms
0.14%
Notes:
1. R = VCO External Resistor (Ω), please refer to PT2399 Application Circuit.
2. fck = VCO Clock Frequency (Hz).
3. td = Delay Time
4. THD = Total Harmonic Distortion
5. We do not recommend the “R” value below 1KΩ when power on.
V1.6
4
February 2010
PT2399
ABSOLUTE MAXIMUM RATING
(Unless otherwise specified, Ta=25℃)
Parameter
Supply voltage
Supply current
Power dissipation
Operation temperature
Storage temperature
Symbol
Vcc
Icc
Pd
Topr
Tstg
Rating
6.5
100
1.7
-40 to +85
-65 to +150
Unit
V
mA
W
℃
℃
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply voltage
Clock frequency
Symbol
Vcc
fck
Min.
4.5
-
Typ.
5
4
Max.
5.5
5
Unit
V
MHz
AC CHARACTERISTICS
(Unless otherwise specified: Vcc=5.0V, fin=1KHz, Vi=500mVrms, fck=4MHz, Ta=25℃)
Parameter
Symbol
Test Condition
Min.
Supply voltage
Vcc
-
4.5
Supply current
Icc
-
-
Voltage gain
Gv
RL=47KΩ
-
Max. output voltage
Vomax
THD=10%
1
Output distortion
THD
A-weighted
-
Output noise voltage
No
A-Weighted
-95
Power supply rejection ratio
PSRR
Vr=100mV, f=100Hz
-
Typ.
5.0
15
-0.5
1.25
0.4
-90
-40
Max.
5.5
30
2.5
1.5
1.0
-80
-30
Unit
V
mA
dB
Vrms
%
dBV
dB
V1.6
5
February 2010
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