PTC PT2256VL

Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
Electronic Volume Controller IC
PT2256V
DESCRIPTION
PT2256V is an electronic volume controller IC utilizing CMOS Technology specially designed for use
on audio equipment. It has 2 built-in channels making it ideally suitable for mono and stereo sound
applications. PT2256V provides the Loudness Function, a wide frequency response range and a very
low total harmonic distortion, thereby guaranteeing a highly effective and reliable performance. It is
housed in 16-pin DIP or SOP and is functionally compatible with TC9235P. Pin assignments and
application circuit are optimized for low cost advantages and easy PCB Layout.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
CMOS Technology
Low Power Consumption
Wide Operation Voltage Range: VDD=4.5 ~ 11V
Least External Components
2 Channels in the same chip
0dB to -78dB Attenuation can be controlled by UP and Down Pin
20dB Tap for Loudness Circuit
Built-in DC Output Circuit (8 levels) for Volume Level Metering
Wide Frequency Response Range
Low Total Harmonic Distortion
Available in 16 pins DIP or SOP
APPLICATION
•
Audio Equipment Volume Control
PT2256V V1.2
-1-
August, 2006
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Electronic Volume Controller IC
PT2256V
BLOCK DIAGRAM
VS S
OUT1
IN 1
VD D
OUT2
IN 2
LT 1
AG N D
LT 2
AG N D
D e co d e r
/U P
/D N
O SC
U p /D o w n
C o u n te r
C o n tr o l
D/A Con ve rte r
DCO
/I N H
/R ST
PT2256V V1.2
-2-
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Electronic Volume Controller IC
PT2256V
PIN CONFIGURATION
VSS
1
16
VDD
OUT1
2
15
OUT2
IN1
3
IN2
LT1
4
14
13
AGND
5
12
LT2
AGND
/UP
6
11
DCO
/DN
7
10
/INH
OSC
8
9
/RST
PT2256V
PIN DESCRIPTION
Pin Number
VSS
OUT1
IN1
LT1
AGND
I/O
O
I
O
-
UP
I
DN
I
OSC
I/O
RST
I
/INH
DCO
LT2
IN2
OUT2
VDD
I
O
O
I
O
-
PT2256V V1.2
Description
Negative Power Supply
Volume Output Pin 1
Volume Input Pin 1
Tap Output Pin 1 for Loudness Function
Analog Ground Pins 1
Volume UP Control Input Pin. The
1 step/1 push volume is controlled by pressing the UP Key. If
the key has been pushed continuously increase. Built-in
Pull-up Resistor.
Volume DOWN Control Input Pin. The
1 step/1 push volume is controlled by pressing the DOWN
Key. If the key is continuously pressed, the volume control will
continuously decrease. Built-in Pull-up Resistor.
Oscillation Pin.
The oscillation circuit of a resistor and capacitor connection.
Oscillator is activated when the key is pressed.
Reset Pin.
This pin sets the initial volume level. The volume level is set to
-46dB by “L” Input. Built-in Pull-up Resistor Low Active
Backup Mode Input Pin
DC Output Pin for Volume Level Meter
Tap Output Pin 2 for Loudness Function
Volume Input Pin 2
Volume Output Pin 2
Positive Power Supply
-3-
Pin No.
1
2
3
4
5, 12
6
7
8
9
10
11
13
14
15
16
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Electronic Volume Controller IC
PT2256V
FUNCTION DESCRIPTION
ATTENUATION
The PT2256V volume control circuit consists of ladder resistors and analog switches. The Tap for
loudness function is connected to the Step 10 (-20dB). When the (3.9KΩ) resistor is connected
between LT and AGND pins, the attenuation is given in table below.
The equivalent circuit is shown below:
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Attenuation
(dB)
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
Step
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Attenuation
(dB)
-32
-34
-36
-38
-40
-42
-46
-50
-54
-58
-62
-66
-70
-74
-78
∞
OUT
Step 0
IN
Step 1
Step 2
29KΩ
Step 9
LT
Step 10
Step 11
22KΩ
Step 30
AGND
Step 31
Note:
1. Step 22 has an initial value of -46dB.
PT2256V V1.2
-4-
August, 2006
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Electronic Volume Controller IC
PT2256V
DC OUTPUT FOR VOLUME LEVEL
The DC Output for the Volume Level Meter is internally connected to the D/A Converter. PT2256V has
8 stages of output voltage with each stage corresponding to a particular volume level. Please refer to
the table below:
Step
0-3
4-7
8-11
12-15
16-19
20-23
24-27
28-31
Attenuation (dB)
0-6
8-14
16-22
24-30
32-38
40-50
54-66
70-∞
Output Voltage (V)
7/8 VDD
6/8 VDD
5/8 VDD
4/8 VDD
3/8 VDD
2/8 VDD
1/8 VDD
0
UP/DOWN VOLUME CONTROL
PT2256V features two Volume Control Pins, namely: UP and DN. UP is the control pin used to
increase volume level while the DN is the control pin used to decrease the volume level. Thus, volume
level may regulated using the Up or Down Keys. These keys are operated on a 1 step/1 push volume
level control when UP or DN keys are set to “L” Level. If the keys are continuously pressed (input
“Low”), then the volume level continuously steps up or down as the case maybe. Please refer to the
diagram below for the timing of the key input.
/UP, /DN Input
Volume Level
Control
t
T
a
Notes:
1. t= Preventive Time for Chattering (2.2 x 1/fosc )
2. T= Switching Time to Automatic Mode (10 x 1/fosc)
3. a=Up, Down Speed (2x1/fosc)
PT2256V V1.2
-5-
August, 2006
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Electronic Volume Controller IC
PT2256V
INITIALIZATION WHEN POWER ON
PT2256V has an auto-initialization function during the Power On period. When Power is turned ON, the
volume level is set to the initial value of -46 dB by setting the RST pin to “L” level. Please refer to the
diagram below.
VDD
VDD
VIL
/RST
0V
T ≥ 1ms
T
BACK UP WHEN POWER OFF
When the /INH Pin is set at “L” Level, all input and output pins are disabled and the current
consumption is reduced to the minimum. Under this condition, the backup becomes possible. Please
refer to the diagram below:
VDD
VDD
B ac ku p
4 . 5V
V D D m in > 4 .5 V
B ac ku p D ata is los t
0V
B ac ku p M od e
No rm al M ode
No rm al M ode
The backup circuit is given below:
10 K
V DD
IN4 001
VD D
10 K
1 000 µ F /16 V
51 K
P T 225 6V
+
-
/I NH
VSS
V SS
Notes:
1. If the VDD drops from 11V to 4.5V, then the backup is possible for a period of 6 days. However, if
VDD-Vss drops below 4.5V, the backup becomes impossible.
PT2256V V1.2
-6-
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Electronic Volume Controller IC
PT2256V
LOUDNESS FREQUENCY RESPONSE
The figure below shows the Loudness Frequency Response Diagram.
0dB
-6dB
-12dB
-42dB
-54dB
-66dB
-78dB
∞
PT2256V V1.2
-7-
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Electronic Volume Controller IC
PT2256V
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise specified, Ta=25℃)
Parameter
Symbol
Supply Voltage
VDD
Input Voltage
VIN
Power Dissipation
PD
Operating Temperature
Topr
Storage Temperature
Tstg
PT2256V V1.2
Rating
-0.3 to 12
-0.3 to VDD+0.3
300
-40 to +85
-65 ~ +150
-8-
Unit
V
V
mW
℃
℃
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Electronic Volume Controller IC
PT2256V
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Ta=25℃, VDD=9V)
Parameter
Symbol
Test Condition
Min.
Typ.
Operating Supply Voltage
VDD
4.5
9.0
Operating Supply Current
IDD
No Load, FOSC=20Hz
0.3
Stand-by Current
ISB
OSC=0V, /INH=0V
0.3
Backup Voltage
VOD
2.0
/INH Pin=0V
Backup Current
IOD
0.1
/UP, /DN, /RST
0.7VDD
High Level Input Voltage
VIH
/INH
0.8VDD
/UP, /DN, /RST
0
Low Level Input Voltage
VIL
/INH
0
Between IN~AGND Resistor
45
54
Voltage Resistor
RVR Between IN~LT Resistor
26
29
Between LT~AGND Resistor
19
22
High Level Input Current
IIH
/INH Input Pin, VIL=VDD
-1
Low Level Input Current
IIL
/INH Input Pin, VIN=0V
-1
Pull-up Resistor
Rup
/UP, /DN, /RST Input Pin
50
70
When 0dB, Between
Analog Switch ON
RON IN1~OUT1 and IN2~OUT2
400
Resistor
Resistor
△ATT Test Attenuation Value
Attenuation Error
0
Balance between Left and
Volume Resistor Error
△RVR
0
Right
between Left and Right
Total Harmonic Distortion
THD
0dB
0.01
FIN=1KHz,
Maximum Attenuation
ATTMAX VIN=1Vrms,
∞dB
90
RL=100KΩ,
Cross Noise
CT
0dB
90
Rg=600Ω
Output Noise
VN
0dB
-100
OSC Frequency
FOSC CX=2.2µf, Rx=33KΩ
18
FIN=1KHz, VIN=1Vrms,
Output Resistance
ROUT
550
650
Volume Control=0dB
FIN=1KHz,
Volume
Maximum Input Amplitude
VIN
VDD=9V
Control=0dB,
THD<0.08%
PT2256V V1.2
-9-
Max.
Unit
11
V
1.0
mA
10
µA
11
V
1.0
µA
VDD
V
VDD
0.3VDD
V
0.7VDD
75
KΩ
45
32
1
mA
1
mA
100
KΩ
500
Ω
±2.0
dB
±3.0
%
-
%
dB
dB
dB
Hz
750
Ω
3.5
Vrms
August, 2006
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Electronic Volume Controller IC
PT2256V
APPLICATION CIRCUIT
SINGLE POWER SUPPLY (NO LOUDNESS AND NO BACKUP CIRCUIT)
VDD (4.5 to 11V)
0.1µF
L-Ch Output
L-Ch Input
10µF
+
10µF
+
3.9K
UP Key
Down Key
Rx
+
Cx
VDD
VSS
OUT1 OUT2
IN1
IN2
LT1
LT3
AGND AGND
/UP
DCO
/INH
/DN
/RST
OSC
+
10µF
+
10µF
R-Ch Output
R-Ch Input
3.9K
10K
100K
0.1µF
PT2256V
+
10K
100µF
Notes:
1. Modifying the values of Rx and Cx affects the Oscillator Frequency of the IC. If the Fosc value is big,
then the volume control change is fast. Likewise, if the Fosc value is small, the volume control
change is slow. It is suggested that Rx= 33K, Cx=2.2µF.
2. The table for the Rx, Cx and Fosc values are given below:
Rx
33K
33K
33K
PT2256V V1.2
Cx
1.0µF
2.2µF
10µF
Fosc
34.1Hz
17.8Hz
3.4Hz
- 10 -
Rx
33K
51K
100K
Cx
1.0µF
1.0µF
1.0µF
Fosc
34.1Hz
22.7Hz
11.8Hz
August, 2006
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Electronic Volume Controller IC
PT2256V
INCLUDING LOUDNESS BUT NO BACKUP CIRCUIT
VDD (4.5 to 11V)
0.1µF
L-Ch Output
L-Ch Input
10µF
+
10µF
+
820Ω
8.2nF
0.1µF
820Ω
UP Key
Down Key
Rx
+
Cx
VDD
VSS
OUT1 OUT2
IN1
IN2
LT1
LT3
AGND AGND
/UP
DCO
/INH
/DN
/RST
OSC
PT2256V
820Ω
+
10µF
+
10µF
R-Ch Output
R-Ch Input
8.2nF
0.1µF
820Ω
10K
100K
0.1µF
+
10K
100µF
Notes:
1. Modifying the values of Rx and Cx affects the Oscillator Frequency of the IC. If the Fosc value is big,
then the volume control change is fast. Likewise, if the Fosc value is small, the volume control
change is slow. It is suggested that Rx= 33K, Cx=2.2µF.
2. The table for the Rx, Cx and Fosc values are given below.
Rx
33K
33K
33K
PT2256V V1.2
Cx
1.0µF
2.2µF
10µF
Fosc
34.1Hz
17.8Hz
3.4Hz
Rx
33K
51K
100K
- 11 -
Cx
1.0µF
1.0µF
1.0µF
Fosc
34.1Hz
22.7Hz
11.8Hz
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Electronic Volume Controller IC
PT2256V
ORDER INFORMATION
Part Number
PT2256V
PT2256V-S
PT2256V-SN
PT2256V (L)
PT2256V-S (L)
PT2256V-SN (L)
Package
16 Pins, DIP, 300mil
16 Pins, SOP, 300mil
16 Pins, SOP, 150mil
16 Pins, DIP, 300mil
16 Pins, SOP, 300mil
16 Pins, SOP, 150mil
Top Code
PT2256V
PT2256V-S
PT2256V-SN
PT2256V
PT2256V-S
PT2256V-SN
Notes:
1. (L), (C) or (S) = Lead Free
2. The Lead Free mark is put in front of the date code.
PT2256V V1.2
- 12 -
August, 2006
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Electronic Volume Controller IC
PT2256V
PACKAGE INFORMATION
16PINS, DIP, 300MIL
PT2256V V1.2
- 13 -
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Electronic Volume Controller IC
Symbol
A
A1
A2
b
b1
b2
b3
c
c1
D
D1
E
E1
e
eA
eB
eC
L
PT2256V
Min.
0.015
0.115
0.014
0.014
0.045
0.030
0.008
0.008
0.780
0.005
0.300
0.240
0.000
0.115
Nom.
0.130
0.018
0.018
0.060
0.039
0.010
0.010
0.790
0.310
0.250
0.100 bsc
0.300 bsc
0.130
Max.
0.210
0.195
0.022
0.020
0.070
0.045
0.014
0.011
0.800
0.325
0.280
0.430
0.060
0.150
Notes:
1.
All dimensions are in INCHES.
2.
Dimensioning and tolerancing per ANSI Y14.5M-1982.
3.
Dimensions “A”, “A1” and “L” are measured with the package seated in JEDEC
Seating Plane Gauge GS-3.
4.
“D”, “D1” and “E1” dimensions do not include mold flash or protrusions. Mold flash or
protrusions shall not exceed 0.010 inch.
5.
“E” and “eA” measured with the leads constrained to be perpendicular to datum -c-.
“eB” and “eC” are measured at the lead tips with the loads unconstrained.
6.
“N” is the number of terminal positions. (N=16)
7.
Pointed or rounded lead tips are preferred to ease insertion.
8.
“b2” and “b3” maximum dimensions are not include dambar protrusions. Dambar
protrusions shall not exceed 0.010 inch (0.25 mm).
9.
Distance between leads including Dambar protrusions to be 0.005 inch minimum.
10. Datum plane -H- coincident with the bottom of lead, where lead exits body.
11. Refer to JEDEC MS-001 Variation AB.
JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2256V V1.2
- 14 -
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Electronic Volume Controller IC
PT2256V
16PINS, SOP, 300MIL
N
H
INDEX
AREA
.25 (.010) M B M
E
-B-
1
2
3
L
-A-
h X 45
SEATING PLANE
A
D
-C∞
-e-
C
A1
.10 (.004)
B
.25 (.010) M C A M B S
Symbol
A
A1
B
C
D
E
e
H
h
L
α
PT2256V V1.2
Min.
Max
2.35
2.65
0.10
0.30
0.33
0.51
0.23
0.32
10.10
10.50
7.40
7.60
1.27 BSC
10.00
10.65
0.25
0.75
0.40
1.27
o
0
8o
- 15 -
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Electronic Volume Controller IC
PT2256V
Notes:
1.
Dimensioning and tolerancing per ANSI Y14.5M-1982.
2.
Dimension “D” does not include mold flash, protrusions or gate burrs. Mold Flash,
protrusion or gate burrs shall not exceed 0.15 mm (0.006 in) per side.
3.
Dimension “E” does not include interlead flash or protrusions. Interlead flash or
protrusions shall not exceed 0.25 mm (0.010 in) per side.
4.
The chamfer on the body is optional. It is not present, a visual index feature must be
located within the crosshatched area.
5.
“L” is the length of the terminal for soldering to a substrate.
6.
N is the number of the terminal positions (N=16)
7.
The lead width “B” as measured 0.36 mm (0.014 in) or greater above the seating
plane, shall not exceed a maximum value of 0.61 mm (0.24 in).
8.
Controlling dimension : MILLIMETER.
9.
Refer to JEDEC MS-013, Variation AA.
JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2256V V1.2
- 16 -
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URL:http://www.princeton.com.tw
Electronic Volume Controller IC
PT2256V
16 PINS, SOP, 150MIL
PT2256V V1.2
- 17 -
August, 2006
Tel:886-2-66296288
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Electronic Volume Controller IC
PT2256V V1.2
PT2256V
- 18 -
August, 2006
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Electronic Volume Controller IC
Symbol
A
A1
A2
b
b1
c
c1
D
E
E1
e
L
L1
L2
R
R1
h
θ
θ1
θ2
PT2256V
Min.
1.35
0.10
1.25
0.31
0.28
0.17
0.17
0.40
0.07
0.07
0.25
0°
5°
0°
Typ.
9.90 BSC.
6.00 BSC.
3.90 BSC.
1.27 BSC.
1.04 REF.
0.25 BSC.
-
Max.
1.75
0.25
1.65
0.51
0.48
0.25
0.23
1.27
0.50
8°
15°
-
Note:
1.
Dimensioning and tolerancing per ANSI Y 14.5M-1994
2.
Controlling Dimension: MILLIMETERS.
3.
Dimension D does not include mold flash protrusions or gate burrs. Mold flash, protrusions or
gate burrs shall not exceed 0.15 mm (0.006 in) per end. Dimension E1 does not include
interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25mm per side. D
and E1 dimensions are determined at datum H.
4.
The package top may be smaller than the package bottom. Dimensions D and E1 are
determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs,
gate burrs and interlead flash, but including any mismatch between the top and bottom of the
plastic body.
5.
Datums A & B to be determined at datum H.
6.
N is the number of terminal positions. (N=16)
7.
The dimensions apply to the flat section of the lead between 0.10 to 0.25mm from the lead tip.
8.
Dimension “b” does not include dambar protrusion. Allowable dambar protrusion shall be
0.10mm total in excess of the “b” dimension at maximum material condition. The dambar cannot
be located on the lower radius of the foot.
9.
This chamfer feature is optional. If it is not present, then a pin 1 identifier must be located within
the index area indicated.
10. Refer to JEDEC MS-012, Variation AC.
JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2256V V1.2
- 19 -
August, 2006