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Electronic Volume Controller IC
PT2253A
DESCRIPTION
PT2253A is an electronic volume controller IC utilizing CMOS Technology specially designed for use on audio equipments. It has two (2) built-in channels making it ideally suitable for mono and stereo sound applications. PT2253A provides a wide frequency response range and a very low harmonic distortion to mention a few; thereby guaranteeing a highly effective and reliable performance.
FEATURES
* CMOS technology * Low power consumption * Operating voltage range: Vcc=6 ~ 12V (Backup voltage is up to 4V) * 0dB to -68dB attenuation controlled by 2dB/step * 2 channels in each chip * Capable to control attenuation by a built-in oscillator and Up/Down pin * Single power supply or dual power supplies of (+) and (-) can be used * Wide frequency response range * Very low harmonic distortion * Available in 16 pin, DIP package
APPLICATIONS
* Audio Equipment Volume Control * Traditional VR Replacement
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
BLOCK DIAGRAM
Vcc Vss /INH
U/D
U/D CK
7 BITS BIDIRECTIONAL SHIFT REGISTER
INT
5 BITS BIDIRECTIONAL CK SHIFT REGISTER U/D
AUTO INITIALIZE CIRCUIT INT CONSTANT CURRENT CIRCUIT DCO
OSC
OSC
L-OUT1
Vcc R-OUT1 CK 7 BITS LATCH CIRCUIT CK 7 BITS LATCH CIRCUIT A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-GND CK 6 BITS LATCH CIRCUIT CK 6 BITS LATCH CIRCUIT A-SW A-SW A-SW A-SW A-SW A-SW R-OUT2 R-IN2 R-IN1
L-IN1
A-SW A-SW A-SW A-SW A-SW A-SW A-SW
CK
CK
A-GND
L-IN2
A-SW A-SW A-SW A-SW A-SW A-SW
L-OUT2
CK
CK
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
PIN CONFIGURATION
Vss L-OUT1 L-IN1 A-GND L-IN2 LOUT2 /INH DCO 1 2 3 4 5 6 7 8 PT2253A 16 15 14 13 12 11 10 9 Vcc R-OUT1 R-IN1 A-GND R-IN2 R-OUT2 U/D OSC
PIN DESCRIPTION
Pin Name I/O Description Pin No. Vss Power Negative Power Supply 1 10dB/Step Attenuator Output L-OUT1 O 2 A signal applied to `IN' is attenuated into 7 steps from 0dB to -60dB. L-IN1 I 10dB/Step Attenuator Input 3 A-GND GND Analog Ground Pin 4 L-IN2 I 2dB/Step Attenuator Input 5 2dB/Step Attenuator Output L-OUT2 O 6 A signal applied to "IN" is attenuated into 5 steps from 0dB to -8dB. Inhibit Terminal. /INH I At "L" level, all inputs and outputs are disabled. 7 At "H" level, operation is normal. DCO O DC Current Output Pin 8 OSC I/O RC Connecting Pin for the Oscillator 9 U/D I Attenuator Up/Down Control Pin 10 R-OUT2 O 2dB/Step Attenuator Output, same as L-OUT2. 11 R-IN2 I 2dB/Step Attenuator Input, same as L-IN2. 12 A-GND GND Analog Ground Pin 13 R-IN1 I 10dB/Step Attenuator Input, same as L-IN1. 14 R-OUT1 O 10dB/Step Attenuator Output, same as L-OUT1. 15 Vcc Power Positive Power Supply 16
PT2253A V2.8 -3December, 2005
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Electronic Volume Controller IC
PT2253A
FUNCTION DESCRIPTION
ATTENUATION SETTING
The Attenuation can be increased or decreased depending on the state of the U/D Pin (either "H" or "L" Level) by actuating the built-in oscillator. When power is applied, the attenuation is automatically set at -40dB.
POWER SUPPLY U/D OSC -30dB -32dB -34dB -36dB -38dB -40dB
When the DOWN Key is pressed, the U/D Pin goes to the "L" Level and the oscillator is actuated in the down state. Thus, attenuation is increased. Conversely, when the UP Key is pressed, the U/D Pin goes to the "H" Level and the oscillator is actuated in the up state. Thus, attenuation is decreased. Oscillation frequency (fosc) is dependent on the Cx and the Rx and is determined by the following equation:
fosc =
1 Hz 0.7 (Cx)(Rx)
where: Rs 3Rx
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Electronic Volume Controller IC
Vcc
PT2253A
Rs
Cx OSC Vcc Rx U/D
+
OSC
UP
DOWN
1F
Rx=33K Cx=4.7F Rs=100K
Vss
PT2253A V2.8
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Electronic Volume Controller IC ATTENUATION DISPLAY OUTPUT
PT2253A
PT2253A has a DC Current Output Pin (DCO). The output level is divided into 13 steps. Please refer to the table below: Step DCO Attenuation 0 0 -64dB ~ 1 2 3 4 5 6 7 8 9 10 11 12 13 I 2I 3I 4I 5I 6I 7I 8I 9I 10I 11I 12I 13I -60dB ~ -62dB -54dB ~ -58dB -50dB ~ -52dB -44dB ~ -48dB -40dB ~ -42dB -34dB ~ -38dB -30dB ~ -32dB -24dB ~ -28dB -20dB ~ -22dB -14dB ~ -18dB -10dB ~ -12dB -4dB ~ - 8dB 0dB ~ -2dB
Current value may fluctuate depending on the IC. When high precision is required, use a variable resistor as a load resistor.
13 12 11 8 9 1K 7 Vss 5 4 3 2 STEP 0 1 About 100mV + 30mV Vss 6 8 About 1.3 V 10
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Electronic Volume Controller IC ATTENUATOR
Attenuator 1 attenuates 0 ~ -60dB at 10dB/step. Attenuator 2 attenuates 0 ~ -8dB at 2dB/step.
BUFFER AMP
PT2253A
0dB 0 IN1 -10 -20 -30 RATT-1 -40 -50 -60 ATTENUATOR 1 A-GND RATT-2=20K (TYP.) -8 ATTENUATOR 2 RATT-2 -6 OUT1 IN2 -2 -4 OUT2
RATT-1=50K(TYP.)
If there is the possibility of excessive voltage in the attenuator, it is recommended that a protective diode be inserted. Please refer to the diagram below.
Vcc
Vcc IN Vss Vss
PT2253A V2.8
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Electronic Volume Controller IC POWER SUPPLY
DUAL POWER SUPPLY
PT2253A
+Vcc
Vcc A-GND Vss /INH DCO DC Vcc UP DOWN U/D OSC
OSC U/D
0V -Vss
SINGLE POWER SUPPLY
+
+Vcc
Vcc A-GND Vss /INH DCO U/D OSC
1/2 VDD (A-GND) 0V (Vss)
DC Vcc
PT2253A V2.8
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Electronic Volume Controller IC INITIALIZATION WHEN POWER ON
PT2253A
PT2253A has the built-in auto-initializing function for during the Power ON period. It has the power supply on reset for the initialization of the chip. If the power supply rises too fast, the initialization may not be fully effected. For initialization to be fully effective, it is necessary to satisfy the following conditions: 1. The /INH Terminal must be raised simultaneously with the supply voltage. 2. Initial attenuation level is -40dB Please refer to the following diagram.
Vcc-Vss or /INH TERMINAL VOLTAGE
Vcc-Vss = 4.0 V
T > 1 msec T
Note: If Vcc-Vss drops below 4.0V, the auto-initializing function is actuated.
BACK UP WHEN POWER OFF
When /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 by means of a capacitor becomes possible. An example of this application when a backup capacitor is used is shown below.
VDD Vcc
10K 10K 1000 16V
Vcc
+ -
PT2253A
Vss /INH
-Vss 51K
If Vcc-Vss drops below 4V, the backup becomes impossible.
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating temperature Storage temperature
Symbol
Topr Tstg
Ratings
-45 ~ +85 -65 ~ +150
Unit
DC ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=12V, Vss=0V and Ta=25) Parameter Symbol Conditions Min. Operating supply voltage Vcc 6 Operating supply current Icc Vcc=12V Stand-by-current ISB /INH=0V OSC=12V Input voltage "H" Level VIH 0.8 x Vcc (/INH, U/D) "L" Level VIL Vss - 0.3 Attenuator 1 Attenuation level RATT-1 25 (10dB/step) resistor is set to 0dB Attenuator 2 Attenuation level RATT-2 10 (2dB/step) resistor is set to 0dB Bias Vcc/2=6V Max. input amplitude Vin Fin=1KHz ATT=0dB Operating oscillation fosc 5 frequency DCO output current IDCO 1 step 70
Typ. 1
50 20 100
Max. 12 3
10 Vcc + 0.3 0.2 x Vcc 70 28 4.0 10 140
Unit V mA
A V K K Vrms KHz A
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=6V, Vss=-6V, GND=0V)
IN1 ~ OUT 1
Parameter
Signal to noise ratio
Symbol
S/N
Frequency response Noise floor Total harmonic distortion
Fr NF THD
Condition ATT=0dB Fin=1KHz Vin=1.0Vrms ATT=-10dB Fin=1KHz Vin=1.0Vp-p Vin=0V, ATT=0dB ATT=-10dB Fin=1KHz Vin=1.0Vrms
Max.
97
Unit
dB
657 0.015 0.010
KHz mV %
IN2 ~ OUT2
Parameter
Signal to noise ratio
Symbol
S/N
Frequency response Noise floor Total harmonic distortion
Fr NF THD
Condition ATT = 0dB Fin=1KHz Vin=1.0Vrms ATT=-2dB Fin=1KHz Vin=1.0Vp-p Vin=0V ATT=0dB ATT=-2dB Fin=1KHz Vin=1.0Vrms
Max.
95
Unit
dB
1820 0.022 0.009
KHz mV %
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
APPLICATION CIRCUIT 1
DUAL POWER SUPPLY (L-CHANNEL ONLY)
Vss -6V
3 10 F
+ _
4 1
+
2
LM358 8
VDD +6V 10 F
+
Vss
Vcc
10 F INPUT GROUND 10 F OUTPUT
+
L-OUT1 R-OUT1 L-IN1 A-GND R-IN1 A-GND R-IN2
+
L-IN2
L-OUT2 R-OUT2 /INH DCO U/D OSC
+
CX 4.7 1N4148
PT2253A
10K
+
RS 100K
1 (0.7) (CX)( RX)
1 F
fosc =
RX 33K 1N4148 UP SW DOWN SW
RS 3RX
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
APPLICATION CIRCUIT 2
DUAL POWER SUPPLY (L-CHANNEL ONLY)
Vss -6V
3
10F
+
LM358
4 1
+ 2
_
8
68pF
VDD +6V 10F +
0.15 F 51K
110K
Vss Vcc
10F INPUT GROUND
+ 10F +
L-OUT1 R-OUT1 L-IN1 A-GND L-IN2 R-IN1 A-GND R-IN2
OUTPUT
L-OUT2 R-OUT2 /INH DCO U/D
PT2253A
10K
CX 4.7
RS 100K
fosc =
1 (0.7)(CX)( RX)
RX 33K
RS 3RX UP SW
1N4148 DOWN SW
Note: Since the buffer amp between Att-1 and Att-2 is already 10dB voltage gain, higher input level may cause OP amp's output clipping. To avoid unwanted distortion, the input signal level applied at IN-1 should not be over 1Vrms.
PT2253A V2.8
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+
+
OSC
1N4148 1F
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Electronic Volume Controller IC
PT2253A
APPLICATION CIRCUIT 3
SINGLE POWER SUPPLY
Vcc (6 ~ 12V)
38 1 + 2LM358 4
0.1F
58 7 + 6LM358 4
Vss
Vcc
L-OUT1 R-OUT1
A-GND L-IN2
A-GND R-IN2
Vcc Vcc
/INH DCO
U/D OSC
PT2253A
10K + 100F
Vcc
+4.7F 1 IN4148 33K IN4148 2 1 2 2 2 +
100K
10K
Up Key
PT2253A V2.8
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+
Output (Left Channel)
10F C3 +
L-OUT2 R-OUT2
+
Input (Left Channel)
10F C1 +
L-IN1
R-IN1
10F C2
Input (Right Channel)
10F C4
Output (Right Channel)
1 F
2
2
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Electronic Volume Controller IC
PT2253A
APPLICATION CIRCUIT 4
SINGLE POWER SUPPLY
Vcc (6 ~ 12V)
0.15F 51K
38 1 + 2LM358 4 110K
0.15F 0.1F 51K
58 7 + 6LM358 4 110K
68pF Input (Left Channel) 10F C1 +
Vss
Vcc
68pF 10F C2 + Vcc
L-OUT1 R-OUT1 L-IN1 A-GND L-IN2 R-IN1 A-GND R-IN2
Input (Right Channel)
/INH DCO
U/D OSC
Vcc
PT2253A
10K + 100F
+
100K
10K
Up Key
Note: Since the buffer amp between Att-1 and Att-2 is already 10dB voltage gain, higher input level may cause OP amp's output clipping. To avoid unwanted distortion, the input signal level applied at IN-1 should not be over 1Vrms.
PT2253A V2.8
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+
Output (Left Channel) Vcc
10F C3 +
L-OUT2 R-OUT2
10F C4
Output (Right Channel)
4.7F 1 IN4148 33K IN4148 2 1 2 2 2 +
1 F
2
2
December, 2005
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Electronic Volume Controller IC
PT2253A
ORDER INFORMATION
Valid Part Number PT2253A PT2253A-S Package Type 16 Pins, DIP, 300mil 16 Pins, SOP, 300mil Top Code PT2253A PT2253A-S
PT2253A V2.8
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Electronic Volume Controller IC
PT2253A
PACKAGE INFORMATION
16 PINS, DIP, 300MIL
PT2253A V2.8
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December, 2005
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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 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
PT2253A
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. Controlling Dimension: 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-. 6. eB and eA are measured at the lead tips with the leads unconstrained. 7. N is the maximum number of terminal positions (N=16). 8. Pointed or rounded lead tips are preferred to ease insertion. 9. b2 and b3 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 (0.25mm). 10. Variation AB is a full lead package. 11. Distance between leads including dambar protrusions to be 0.005 in minimum. 12. Datum plane -H- coincident with the bottom of lead where lead exits body. 13. Refer to JEDEC MS-001 Variation AB. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
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Electronic Volume Controller IC 16 PINS, SOP, 300MIL
PT2253A
Symbol A A1 B C D E e H h L
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
PT2253A V2.8
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December, 2005
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Electronic Volume Controller IC
PT2253A
Notes: 1. Controlling Dimension: MILLIMETER 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions and gate burrs shall not exceed 0.15mm (0.006 in) per side. 4. Dimension E does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25 mm (0.010 in.) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. L is the length of the terminal for soldering to a substrate. 7. N is the number of terminal positions (N=16). 8. The lead width B, as measured 0.36 mm (0.014in) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024in.) 9. Refer to JEDEC MS-013 Variation AA. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2253A V2.8
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