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Princeton Technology Corp.
6-Channel Electronic Volume Controller IC DESCRIPTION
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
PT2258 is a 6-Channel Electronic Volume Controller IC utilizing CMOS Technology specially designed for the new generation of AV Multi-Channel Audio System. PT2258 provides an I2C Control Interface, an attenuation range of 0 to -79 dB at 1 dB/step, low noise, high channel separation. Housed in 20-pin, DIP or SO Package, PT2258's pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages.
FEATURES
* * * * * * * * * * * CMOS Technology Low Power Consumption Least External Components Attenuation Range: 0 to -79 dB at 1dB/step Operating Voltage: 5 to 9 V Low Noise, S/N Ratio>100dB (A-weighting) High Channel Separation I2C Bus Control Interface Selectable Address 6-Channel Outputs Available in 20-pin, DIP or SO Package
APPLICATIONS
* * * * * AV Surround Audio Equipment Car Audio Mini Compo Computer Multi-Media Speaker Other Audio Equipments
PT2258 pre1.0
1
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC BLOCK DIAGRAM
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
1 d B /s te p
1 d B /s te p
1 d B /s te p
1 d B /s te p
1 d B /s te p
1 d B /s te p
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC PIN CONFIGURATION
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
IN 1 IN 2 IN 3 CODE2 DGND SCL SDA IN 4 IN 5 IN 6
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
OUT1 OUT2 OUT3 CODE1 VCC REF GND OUT4 OUT5 OUT6
PT2258
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC PIN DESCRIPTION
Pin Name IN1 IN2 IN3 CODE2 DGND SCL SDA IN4 IN5 IN6 OUT6 OUT5 OUT4 GND REF VCC CODE1 OUT3 OUT2 OUT1 I/O I I I I I I I I O O O O O O
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Description Channel Input No. 1. Connect a Capacitor to Audio Source Channel Input No. 2 Connect a Capacitor to Audio Source Channel Input No. 3 Connect a Capacitor to Audio Source Refer to Address Code Section Digital Ground I2C Clock Input I2C Data Input Channel Input No. 4 Connect a Capacitor to Audio Source Channel Input No. 5 Connect a Capacitor to Audio Source Channel Input No. 6 Connect a Capacitor to Audio Source Channel Output No. 6 Connect a Capacitor to the Next Stage Channel Output No. 5 Connect a Capacitor to the Next Stage Channel Output No. 4 Connect a Capacitor to the Next Stage Ground Reference Voltage= 1/2 Vcc Connect a Capacitor to the Ground Power Supply Input Refer to the Address Code Section Channel Output No. 3 Connect a Capacitor to the Next Stage Channel Output No. 2 Connect a Capacitor to the Next Stage Channel Output No. 1 Connect a Capacitor to the Next Stage
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC FUNCTIONAL DESCRIPTION
Bus Interface
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Data are transmitted to and from the microprocessor to the PT2258 via the SDA and SCL. The SDA and SCL make up the BUS Interface. It should be noted that the pull-up resistors must be connected to the positive supply voltage.
Data Validity
A data on the SDA Line is considered valid and stable only when the SCL Signal is in HIGH State. The HIGH and LOW States of the SDA Line can only change when the SCL signal is LOW. Please refer to the figure below.
SDA
SCL
Start and Stop Conditions
A Start Condition is activated when 1) the SCL is set to HIGH and 2) SDA shifts from HIGH to LOW State. The Stop Condition is activated when 1) SCL is set to HIGH and 2) SDA shifts from LOW to HIGH State. Please refer to the timing diagram below. SCL
SDA
PT2258 pre1.0
5
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
Byte Format
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an Acknowledge Bit. The MSB is transmitted first.
Acknowledge
During the Acknowledge Clock Pulse, the master (P) puts a resistive HIGH level on the SDA Line. The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during the Acknowledge Clock Pulse so that the SDA Line is in a Stable Low State during this Clock Pulse. Please refer to the diagram below.
The audio processor that has been addressed has to generate an Acknowledge after receiving each byte, otherwise, the SDA Line will remain at the High Level during the ninth (9th) Clock Pulse. In this case, the master transmitter can generate the STOP Information in order to abort the transfer.
Transmission without Acknowledge
If you want to avoid the acknowledge detection of the audio processor, a simpler P transmission may be used. Wait one clock and do not check the slave acknowledge of this same clock then send the new data. If you use this approach, there are greater chances of faulty operation as well as decrease in noise immunity.
PT2258 pre1.0
6
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
Interface Protocol
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
The interface protocol consists of the following: * A Start Condition * A Chip Address Byte including the PT2258 address. The 8th Bit of the Byte must be "0". PT2258 must always acknowledge the end of each transmitted byte. * A Data Sequence (N-Bytes + Acknowledge) * A Stop Condition Please refer to the diagram below: PT2258 Address
Software Specification
PT2258 ADDRESS CODE PT2258 Address Code depends on the state of CODE1 (Pin No. 17) and CODE2 (Pin No.4). If CODE1 or CODE2 is connected to Vcc, then CODE1 or CODE2 is set to "1". If CODE1 or CODE2 is connected to the Ground, it is set to "0". Please refer to the information below: Condition 1: When CODE1="1" and CODE2="1": CODE1 1 Then, the PT2258 Address Code is (8CH): 1 MSB 0 0 0 1 1 0 0 LSB CODE2 1
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
Condition 2: When CODE1="1" and CODE2="0":
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
CODE1 1 Then, the PT2258 Address Code is (88H): 1 MSB 0 0 0
CODE2 0
1
0
0
0 LSB
Condition 3: When CODE1="0" and CODE2="1": CODE1 0 Then, the PT2258 Address Code is (84H): 1 MSB 0 0 0 0 1 0 0 LSB CODE2 1
Condition 4: When CODE1="0" and CODE2="0":
CODE1 0 Then, the PT2258 Address Code is (80H): 1 MSB 0 0 0
CODE2 0
0
0
0
0 LSB
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
Data Bytes Description
FUNCTION BITS MSB 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 LSB A0 B0 A0 B0 A0 B0 A0 B0 A0 B0 A0 B0 A0 B0 M
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
1 1 0 0 0 0 1 1 1 1 0 0 0 0 1
1 0 0 0 1 1 0 0 1 1 0 0 1 1 1
0 1 1 0 1 0 1 0 1 0 1 0 1 0 1
A3 0 A3 0 A3 0 A3 0 A3 0 A3 0 A3 0 1
A2 B2 A2 B2 A2 B2 A2 B2 A2 B2 A2 B2 A2 B2 0
A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 0
FUNCTION 6-Channel, -1dB/step 6-Channel, -10dB/step Channel No. 3, -1dB/step Channel No. 3, -10dB/step Channel No. 4, -1dB/step Channel No. 4, -10dB/step Channel No. 2, -1dB/step Channel No. 2, -10dB/step Channel No. 5, -1dB/step Channel No. 5, -10dB/step Channel No. 1, -1dB/step Channel No. 1, -10dB/step Channel No. 6, -1dB/step Channel No. 6, -10dB/step 6-Channel, MUTE When M=1, MUTE=ON When M=0, MUTE=OFF
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
ATTENUATION UNIT BIT A3/--0 0 0 0 0 0 0 0 1 1 A2/B2 0 0 0 0 1 1 1 1 0 0 A1/B1 0 0 1 1 0 0 1 1 0 0 A0/B0 0 1 0 1 0 1 0 1 0 1
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
ATTENUATION VALUE (dB) 0/0 -1/-10 -2/-20 -3/-30 -4/-40 -5/-50 -6/-60 -7/-70 -8/---9/---
where: Ax=-1dB/step, Bx=-10dB/step
ABSOLUTE MAXIMUM RATING
Symbol Vs Tamb Tstg Parameter Supply Voltage Ambient Temperature Storage Temperature Rating 12 -20 to +75 -40 to +125 Unit V o C o C
PT2258 pre1.0
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Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC ELECTRICAL CHARACTERISTICS
Symbol VDD Is RIN VCL Sc CRANGE AVMAX Astep EA AMUTE THD Noise S/N Ro Go Vomax Parameter Supply Voltage Supply Current Input Impedance Maximum Input Voltage Channel Separation Volume Control Range Maximum Attenuation Attenuation Step Attenuation Error Mute Attenuation Total Harmonic Distortion Output Noise Signal-to-Noise Ratio Output Impedance Output Gain Maximum Output Condition
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Min. 5 27
FL,FR,CTR SUB,SL,SR Volume=0dB THD=1%
Typ. 9 8 30 2.8
Max. 10 35 3.0 110
Unit V mA K Vrms dB dB dB dB dB dB % V dB dB Vrms
90
100 79
Volume=0~-50dB A-weighting Volume=0dB Input,200mVrms A-weighting 0dB=1Vrms A-weighting
-1.0 90 0.003
-79 1 0 +1.0 95 98 0.005 0.01 3 105 600 0 2.6 5 110 900 +0.5 2.9
100
FL,FR,CENTER SUB,SL,SR THD=1%
-0.5 2.3
I2C BUS SECTION ELECTRICAL CHARACTERISTICS
Symbol VIL VIH TINIT
PT2258 pre1.0
Parameter Bus Low Input Level Bus High Input Level Bus Initialization
11
Condition
Min. 2.8
Cref=10F
Typ. 2.4 3.0 250
Max. 2.5 300
Unit V V mS
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC APPLICATION CIRCUIT
IN P U T
10 0K 10 0K 10 0K 10 uf 10 uf 10 uf
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
1 IN 1 2 IN 2 3 IN 3 4 CODE2 5 DGND
O U T1 20 O U T2 19 O U T3 18 CO DE1 17 V C C 16 R E F 15 G N D 14 O U T4 13 O U T5 12 O U T 6 11
+ + +
10 uf 10 uf 10 uf
VCC
OUTPUT
10 0K 10 0K 10 0K
I 2C B u s
M CU
10 uf 10 0K 10 0K 10 0K 10 uf 10 uf
ORDER INFORMATION
Valid Part Number PT2258 PT2258-S Package Type 20 Pins, DIP Package (300 mil) 20 Pins, SO Package (300 mil)
PT2258 pre1.0
+ + + + + +
+
10 uf
6 SCL 7 SDA 8 IN 4 9 IN 5 10 IN 6
+ + + +
10 uf 10 uf
C ref 10 uf
10 0K 10 0K 10 0K
10 uf
PT2258
A d d ress= 88 H ex
DGND AGND
12
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC PACKAGE INFORMATION
20-Pin, DIP Package (300 mil)
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Symbols Min. A A1 A2 b b1 b2 b3 c c1 D D1 E E1 e eA eB eC L
PT2258 pre1.0
Dimensions in Inches Nom.
Max. 0.210 0.195 0.022 0.020 0.070 0.045 0.014 0.011 1.060 0.325 0.280
0.015 0.115 0.014 0.014 0.045 0.030 0.008 0.008 0.980 0.005 0.300 0.240
0.130 0.018 0.018 0.060 0.039 0.010 0.010 1.030 0.310 0.250 0.100 bsc 0.300 bsc.
0.000 0.115
13
0.130
0.430 0.060 0.150
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Notes: 1. All dimensions are in INCHES. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "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 "eC" are measured at the lead tips with the leads unconstrained. 7. N is the number of terminal positions (N=20) 8. Pointed or rounded lead tips are preferred to ease insertion. 9. "b2" and "b3" maximum dimensions are not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm). 10. Distance between leads including Dambar protrusions to be 0.005 inch minimum. 11. Datum plane -H- coincident with the bottom of lead, where lead exits body. 12. Refer to JEDEC MS-001, Variation AD.
PT2258 pre1.0
14
Updated July 2000
Princeton Technology Corp.
6-Channel Electronic Volume Controller IC
20-Pin, SO Package (300 mil)
Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Preliminary
PT2258
Symbols A A1 B C D E e H h L
Dimensions in Millimeter Nom. Max. 2.65 0.30 0.51 0.32 13.00 7.60 1.27 bsc. 10.00 10.65 0.25 0.75 0.40 1.27 0o 8o Min. 2.35 0.10 0.33 0.23 12.60 7.40
Notes: 1. Dimensioning and tolerancing per ANSI Y14.5-1982. 2. Dimension "D" does not include mold flash , protrusions or gate burrs. Mold Flash, protrusion or gate burrs shall not exceed 0.15mm (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 terminal positions. (N=20) 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 AC
PT2258 pre1.0 15 Updated July 2000

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