Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Volume Controller IC
PT2310
DESCRIPTION
The PT2310 is an electronic volume controller IC designed for audio equipment. Utilize CMOS
Technology; it has 2 individual channels attenuator built inside and ideal for both mono and stereo
applications. The PT2310 provides wide frequency response range, very low total harmonic distortion
and low noise. It also has a built-in loudness compensation function for the sound effect improvement.
FEATURES
•
•
•
•
•
•
•
•
•
CMOS Technology
Low Power Consumption
Two channel independent volume attenuator
Simplified External Components
Wide Supply Voltage 4.5V∼12V, controlled by MCU interface
Attenuation Range 0dB∼-78dB (2dB/Step)
Built-in Loudness Compensation Function
Wide Frequency Response, Low Total Harmonic Distortion and Low Noise
Available in 16 Pins DIP and 16 Pins SOP
APPLICATIONS
•
Audio Equipments
•
TV
•
Multi-media Sound Device
PT2310 V1.0
-1-
June, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Volume Controller IC
PT2310
BLOCK DIAGRAM
VS S
OUT-L
IN-L
LD1-L
L-ch
Latch
LD2-L
AGND -L
CS
CK
Data Decoder, ST B Generator
Shift Register (13bit)
R-ch
Latch
LD2-R
AGND -R
ST B
DATA
VD D
OUT-R
IN-R
LD1-R
PIN CONFIGURATION
V
SS
O U T-L
IN-L
L D 1 -L
L D 2 -L
A G N D -L
CS
CK
1
2
3
4
5
6
7
8
P T 2 31 0
16
15
14
13
12
11
10
9
V
D D
O U T-R
IN-R
L D 1 -R
L D 2 -R
A G N D -R
ST B
D ATA
PT2310 V1.0
-2-
June, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Volume Controller IC
PT2310
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
V
SS
OUT-L
IN-L
LD1-L
LD2-L
AGND-L
CS
CK
DATA
STB
AGND-R
LD2-R
LD1-R
IN-R
OUT-R
V
DD
I/O
-
O
I
O
O
-
-
I
I
I
-
O
O
I
O
-
Description
Supply voltage input (-)
Left channel output
Left channel input
Left channel volume loudness
tap (1)
Left channel volume loudness
tap (2)
Analog ground
Chip select pin
Clock input
Data code input
Strobe
Analog ground
Right channel volume
loudness tap (2)
Right channel volume
loudness tap (1)
Right channel input
Right channel output
Supply voltage input (+)
Function
-
Volume control circuit:
O UT-L
IN-L
L D1-L
L S1
L D2-L
AG ND-L
L S2
(Loudness On: LS1=On, LS2=Off)
C2、C3、C4 Fixed codes are 0, 1, 1
When CS=1, C1=1
When CS=0, C1=0
(see P.5 description)
-
Attenuation value is defined by the
data code; the data code is
consisting of 13bits.
After the DATA & CK codes were
sent, a high strobe pulse in STB pin
to confirm the data is validity.
Volume control circuit:
O UT-R
IN-R
L D1-R
L S1
L D2-R
AG ND-R
L S2
(Loudness On: LS1=On, LS2=Off)
-
PT2310 V1.0
-3-
June, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Volume Controller IC
PT2310
FUNCTION DESCRIPTION
ATTENUATION
The PT2310 volume attenuator is consists of resistor ladder and analog switch. The Tap for loudness
function is connected to the Step 10 (-20 dB). The relations of step and attenuation is given in table
below
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
dB
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
-36
-38
-40
Step
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
dB
-42
-44
-46
-48
-50
-52
-54
-56
-58
-60
-62
-64
-66
-68
-70
-72
-74
-76
-78
-∞
OUT
IN
Ladder resistors Diagram
S0
S1
28.5KΩ
LS1
LD1
S9
S10
S11
LD2
3.7K
Ω
S12
21.97KΩ
LS2
S39
AGND
S40
Note:
1. Loudness On: LS1=On, LS2=Off
2. Loudness Off: LS1=Off, LS2=On
PT2310 V1.0
-4-
June, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Volume Controller IC
PT2310
SERIAL BUS INTERFACE
The DATA, CK and STB pins consist of bus line; the bus line is for communication with the MCU and
the PT2310.
SERIAL DATA CODE
The data code is consists by L, R, D1~D4, LD, C1~C4 (totally 13 bits), at the end of the code there
needs a high strobe pulse to confirm the data code is validity.
CK
D ATA
L
R D1 D2 D3 D4 D5 D6 LD C1 C2 C3 C4
STB
CHIP SELECTION (C1~C4)
The Chip Selection code C1 is depending on the states of the CS pin, the CS pin in low state means the
C1 bit=0; and the CS pin in high state means the C1 bit=1. Ignore what states of the CS pin the C2, C3
and C4 bit is presets to the state 0, 1, 1.
CS
“1”
“0”
C1
1
0
C2
0
0
C3
1
1
C4
1
1
LEFT AND RIGHT CHANNEL CONTROL CODE
In the DATA code, the “L” bit is for left channel and the “R” is for right channel is selected. If the “L” bit
is 1 means the attenuation value (D1 to D6) is for left channel exclusively; and if “L” and “R” all are “1”
means attenuation value is for the both channel.
LOUDNESS SETUP CODE
The “LD” bit In the DATA code is for the Loudness function. When the “LD” bit is 0, the Loudness
function is turned off (LS1=Off, LS2=ON) and the “LD” bit is 1 means the Loudness is turned ON
(LS1=On, LS2=Off).
PT2310 V1.0
-5-
June, 2005
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