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SA575 Low Voltage Compandor
The SA575 is a precision dual gain control circuit designed for low voltage applications. The SA575's channel 1 is an expandor, while channel 2 can be configured either for expandor, compressor, or automatic level controller (ALC) application.
Features
* Operating Voltage Range from 3.0 V to 7.0 V * Reference Voltage of 100 mVRMS = 0 dB * One Dedicated Summing Op Amp Per Channel and Two Extra * * * * * * * * * * * * *
Uncommitted Op Amps 600 W Drive Capability Single or Split Supply Operation Wide Input/Output Swing Capability Pb-Free Packages are Available*
20
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20 1
SOIC-20 WB D SUFFIX CASE 751D
Applications
TSSOP-20 DTB SUFFIX CASE 948E 1
Portable Communications Cellular Radio Cordless Telephone Consumer Audio Portable Broadcast Mixers Wireless Microphones Modems Electric Organs Hearing Aids
PDIP-20 N SUFFIX CASE 738 20 1
PIN CONNECTIONS
D* and DTB Packages
+VIN1 -VIN1 VOUT1 RECT. IN1 1 2 3 4 20 VCC 19 +VIN2 18 -VIN2 17 VOUT2 16 RECT.IN2 15 CRECT2 14 SUM OUT2 13 COMP.IN2 12 SUM NODE 2 11 GAIN CELL IN2
CRECT1 5 SUM OUT 1 COMP. IN1 6 7
VREF 8 GAIN CELL IN1 9 GND 10
*Available in large SOL package only.
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 13 of this data sheet.
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 13 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2006
1
September, 2006 - Rev. 3
Publication Order Number: SA575/D
SA575
0.1mF VCC +5V C15
1 2
C3 VOUT
+ -
OP AMP
575
VCC
20 19 18 17
R13 10kW
10mF
GND VIN VREF
+
OP AMP
+
C14
+
10mF
3 4
3.8kW
-
C11
+
5
CRECT 2.2mF 3.8kW
16
S S 10kW
+
4.7mF CRECT
6 7 8
15 14 13
10kW
+
+
C10 VOUT
GND VIN VREF
2.2mF
C6 10mF
10mF
+
VREF DG 10kW DG GND 10kW
R8 30kW R7
+
10mF
9 10
12
30kW
+
C8
1mF
11
GND
GND
GND
Figure 1. Block Diagram and Test Circuit
PIN FUNCTION DESCRIPTION
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol +VIN1 -VIN1 VOUT RECT. IN1 CRECT1 SUM OUT1 COMP. IN1 VREF GAIN CELL IN1 GND GAIN CELL IN2 SUM NODE 2 COMP. IN2 SUM OUT2 CRECT2 RECT. IN2 VOUT2 -VIN2 +VIN2 VCC Non-Inverted Input 1 Inverted Input 1 Output Rectifier 1 Input External Capacitor Pinout for Rectifier 1 Summation Output 1 Compensator Pin Voltage Reference Variable Gain Cell Input 1 Ground Variable Gain Cell Input 2 Summation Node 2 Compensator Pin Summation Output 2 External Capacitor Pinout for Rectifier 2 Rectifier 2 Input Output 2 Inverted Input 2 Non-Inverted Input 2 Positive Power Supply Description
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SA575
MAXIMUM RATINGS
Rating Single Supply Voltage Voltage Applied to Any Other Pin Operating Ambient Temperature Range Operating Junction Temperature Storage Temperature Range Thermal Impedance SOIC TSSOP PDIP SOIC TSSOP PDIP Symbol VCC VIN TA TJ TSTG qJA Value -0.3 to 8.0 -0.3 to (VCC + 0.3) -40 to +85 150 150 87 124 70 1116 1068 1344 Unit V V C C C C/W
Maximum Power Dissipation
PD
mW
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.
DC ELECTRICAL CHARACTERISTICS Typical values are at TA = 25C. Minimum and Maximum values are for the full operating
temperature range: -40 to +85C for SA575, except SSOP package is tested at +25C only. VCC = 5.0 V, unless otherwise stated. Both channels are tested in the Expandor mode (see Test Circuit). Characteristic Symbol Test Conditions Min Typ Max Unit
FOR COMPANDOR, INCLUDING SUMMING AMPLIFIER Supply Voltage (Note 1) Supply Current Reference Voltage (Note 2) Summing Amp Output Load Total Harmonic Distortion Output Voltage Noise Unity Gain Level Output Voltage Offset Output DC Shift VCC ICC VREF RL THD ENO 0dB VOS - No Signal VCC = 5.0 V - 1.0 kHz, 0 dB, BW = 3.5 kHz BW = 20 kHz, RS = 0 W 1.0 kHz No Signal No Signal to 0 dB Gain Cell Input = 0 dB, 1.0 kHz Rectifier Input = 6.0 dB, 1.0 kHz Tracking Error Relative to 0 dB Crosstalk FOR OPERATIONAL AMPLIFIER Output Swing Output Load Input Common-Mode Range Common-Mode Rejection Ratio Input Bias Current Input Offset Voltage Open-Loop Gain Slew Rate Bandwidth Input Voltage Noise Power Supply Rejection Ratio VO RL CMR CMRR IB VOS AVOL SR GBW ENI PSRR RL = 10 kW 1.0 kHz - - VIN = 0.5 V to 4.5 V - RL = 10 kW Unity Gain Unity Gain BW = 20 kHz 1.0 kHz, 250 mV VCC-0.4 600 0 60 -1.0 - - - - - - VCC - - 80 - 3.0 80 1.0 3.0 2.5 60 - - VCC - 1.0 - - - - - - V W V dB mA mV dB V/ms MHz mV dB Gain Cell Input = 0 dB, 1.0 kHz Rectifier Input = -30 dB, 1.0 kHz 1.0 kHz, 0 dB, CREF = 220 mF 3.0 3.0 2.4 10 - - -1.5 -150 -100 -1.0 -1.0 - 5.0 4.2 2.5 - 0.12 6.0 - - - - - -80 7.0 5.5 2.6 - 1.5 30 1.5 150 100 1.0 1.0 -65 V mA V kW % mV dB mV mV dB dB dB
1. Operation down to VCC = 2.0 V is possible, but performance is reduced. See curves in Figures 6 and 7. 2. Reference voltage, VREF, is typically at 1/2 VCC.
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SA575
Functional Description
This section describes the basic subsystems and applications of the SA575 Compandor. More theory of operation on compandors can be found in AND8159 and AND8160. The typical applications of the SA575 low voltage compandor in an Expandor (1:2), Compressor (2:1) and Automatic Level Control (ALC) function are explained. These three circuit configurations are shown in Figures 2, 3, and 4 respectively. The SA575 has two channels for a complete companding system. The left channel, A, can be configured as a 1:2 Expandor while the right channel, B, can be configured as either a 2:1 Compressor, a 1:2 Expandor or an ALC. Each channel consists of the basic companding building blocks of rectifier cell, variable gain cell, summing amplifier and VREF cell. In addition, the SA575 has two additional high performance uncommitted op amps which can be utilized for application such as filtering, pre-emphasis/ de-emphasis or buffering. Figure 5 shows the complete schematic for the applications demo board. Channel A is configured as an expandor while channel B is configured so that it can be used either as a compressor or as an ALC circuit. The switch, S1, toggles the circuit between compressor and ALC mode. Jumpers J1 and J2 can be used to either include the additional op amps for signal conditioning or exclude them from the signal path. Bread boarding space is provided for R1, R2, C1, C2, R10, R11, C10 and C11 so that the response can be tailored for each individual need. The components as specified are suitable for the complete audio spectrum from 20 Hz to 20 kHz. The most common configuration is as a unity gain non-inverting buffer where R1, C1, C2, R10, C10 and C11 are eliminated and R2 and R11 are shorted. Capacitors C3, C5, C8, and C12 are for DC blocking. In systems where the inputs and outputs are AC coupled, these capacitors and resistors can be eliminated. Capacitors C4 and C9 are for setting the attack and release time constant.
C6 is for decoupling and stabilizing the voltage reference circuit. The value of C6 should be such that it will offer a very low impedance to the lowest frequencies of interest. Too small a capacitor will allow supply ripple to modulate the audio path. The better filtered the power supply, the smaller this capacitor can be. R12 provides DC reference voltage to the amplifier of channel B. R6 and R7 provide a DC feedback path for the summing amp of channel B, while C7 is a short-circuit to ground for signals. C14 and C15 are for power supply decoupling. C14 can also be eliminated if the power supply is well regulated with very low noise and ripple.
Demonstrated Performance
The applications demo board was built and tested for a frequency range of 20 Hz to 20 kHz with the component values as shown in Figure 5 and VCC = 5.0 V. In the expandor mode, the typical input dynamic range was from -34 dB to +12 dB where 0 dB is equal to 100 mVRMS. The typical unity gain level measured at 0 dB @ 1.0 kHz input was "0.5 dB and the typical tracking error was "0.1 dB for input range of -30 to +10 dB. In the compressor mode, the typical input dynamic range was from -42 dB to "18 dB with a tracking error +0.1 dB and the typical unity gain level was "0.5 dB. In the ALC mode, the typical input dynamic range was from -42 dB to +8.0 dB with typical output deviation of "0.2 dB about the nominal output of 0 dB. For input greater than +9.0 dB in ALC configuration, the summing amplifier sometimes exhibits high frequency oscillations. There are several solutions to this problem. The first is to lower the values of R6 and R7 to 20 kW each. The second is to add a current limiting resistor in series with C12 at Pin 13. The third is to add a compensating capacitor of about 22 to 30 pF between the input and output of summing amplifier (Pins 12 and 14). With any one of the above recommendations, the typical ALC mode input range increased to +18 dB yielding a dynamic range of over 60 dB.
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SA575
Expandor
The typical expandor configuration is shown in Figure 2. The variable gain cell and the rectifier cell are in the signal input path. The VREF is always 1/2 VCC to provide the maximum headroom without clipping. The 0 dB ref is 100 mVRMS. The input is AC coupled through C5, and the output is AC coupled through C3. If in a system the inputs and outputs are AC coupled, then C3 and C5 can be eliminated, thus requiring only one external component, C4. The variable gain cell and rectifier cell are DC coupled so any offset voltage between Pins 4 and 9 will cause small offset error current in the rectifier cell. This will affect the
accuracy of the gain cell. This can be improved by using an extra capacitor from the input to Pin 4 and eliminating the DC connection between Pins 4 and 9. The expandor gain expression and the attack and release time constant is given by Equation 1 and Equation 2, respectively.
Expandor gain = 4VIN(avg) 3.8 kW x 100 mA
2
(eq. 1)
where VIN(avg) = 0.95VIN(RMS) tR = tA = 10 kW x CRECT = 10 kW x C4
(eq. 2)
7, 13 C5 EXP IN 10mF 10kW 9, 11 DG S 10kW 6, 14 C3 EXP OUT 10mF
4, 16 3.8kW 5, 15 2.2mF VREF 8
C4
Figure 2. Typical Expandor Configuration
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SA575
Compressor
The typical compressor configuration is shown in Figure 3. In this mode, the rectifier cell and variable gain cell are in the feedback path. R6 and R7 provide the DC feedback to the summing amplifier. The input is AC coupled through C12 and output is AC coupled through C8. In a system with inputs and outputs AC coupled, C8 and C12 could be eliminated and only R6, R7, C7, and C13 would be required. If the external components R6, R7 and C7 are eliminated, then the output of the summing amplifier will motor-boat in absence of signals or at extremely low signals. This is because there is no DC feedback path from
R6 30kW C7 VREF 8 12
the output to input. In the presence of an AC signal this phenomenon is not observed and the circuit will appear to function properly. The compressor gain expression and the attack and release time constant is given by Equation 3 and Equation 4, respectively.
Compressor gain = 3.8 kW x 100 mA 4VIN(avg) where VIN(avg) = 0.95VIN(RMS)
tR = tA = 10 kW x CRECT = 10 kW x C4
R7 30kW 1mF
1/2
(eq. 3)
(eq. 4)
C12 13 COMP IN 10mF 10kW
S
C8 14 10mF COMP OUT
DG 10kW
11
16 3.8kW 15 C9 2.2mF
C13 4.7mF
Figure 3. Typical Compressor Configuration
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SA575
Automatic Level Control
The typical Automatic Level Control circuit configuration is shown in Figure 4. It can be seen that it is quite similar to the compressor schematic except that the input to the rectifier cell is from the input path and not from the feedback path. The input is AC coupled through C12 and C13 and the output is AC coupled through C8. Once again, as in the previous cases, if the system input and output signals are already AC coupled, then C12, C13 and C8 could be eliminated. Concerning the compressor, removing R6, R7 and C7 will cause motor-boating in
R6 30kW
absence of signals. CCOMP is necessary to stabilize the summing amplifier at higher input levels. This circuit provides an input dynamic range greater than 60 dB with the output within "0.5 dB typical. The necessary design expressions are given by Equation 5 and Equation 6, respectively.
ALC gain = 3.8 kW x 100 mA 4VIN(avg)
(eq. 5) (eq. 6)
tR = tA = 10 kW x CRECT = 10 kW x C9
R7 30kW C7 1mF
C COMP
VREF 8 12
22pF
C12 ALC IN 10mF 13 10kW
S
C8 14 10mF ALC OUT
DG 10kW
11
C13 16 4.7mF 3.8kW 15 C9 2.2mF
Figure 4. Typical ALC Configuration
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SA575
VCC -5V C15 VREF 0.1mF C14
1
R1
+ -
OP AMP
575
VCC
20 19
47mF
2
C1 C3 EXP OUT 10mF J1 C2 R2
+
OP AMP
R12 10kW
C12
R10
10mF C10
COMP/ ALC IN
3 4
3.8kW
-
18
R11 C11 J2 C13
17 16
3.8kW S S 10kW C9 4.7mF
5
2.2mF C4
ALC S1 COMP
6
C5 EXP IN 10mF
15
2.2mF
7 8 VREF
C6 10mF VREF
14 13
10kW R6
C8
R7 30kW
10mF
COMP/ ALC OUT
9
10kW
DG DG GND 10kW
12 11
30kW
C7 1mF
10
Figure 5. SA575 Low Voltage Expandor/Compressor/ALC Demo Board
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SA575
1.0 0.9 0.8 0.7 0.6 0.5 UNITY GAIN ERROR (dB) 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1.0 -50 -25 0 25 TEMPERATURE (C) 50 75 100 VCC 2V VCC 3V VCC 5V VCC 7V
Figure 6. Unity Gain Error vs. Temperature and VCC
4.4
4.2
4.0 VCC 7V 3.8
(mA) I CC
3.6
VCC 5V
3.4
VCC 3V VCC 2V
3.2
3.0 -50
-25
0
25 TEMPERATURE (C)
50
75
100
Figure 7. ICC vs. Temperature and VCC
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SA575
TYPICAL PERFORMANCE CHARACTERISTICS
8
GENERAL DIAGRAM 10mF 4.7mF
6
10dB IN INPUT (20-20kHz) DG REC SUM
4
2 0dB IN 0 VCC = 5V
OUTPUT
-2
OUTPUT LEVEL (dB)
-4
-6
-8
-10 -12
-14
-16
-18 -40dB IN -20
-22 10 100 1000 10000 30000
FREQUENCY (Hz)
Figure 8. Compressor Output Frequency Response
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SA575
TYPICAL PERFORMANCE CHARACTERISTICS
8 INPUT (20-20kHz) 2.5dB IN 4.7mF 4 REC OUTPUT SUM 2 0dB IN 0 10mF VCC = 5V DG
GENERAL DIAGRAM
6
-2
OUTPUT LEVEL (dB)
-4
-6 -8
-10
-12
-14
-16
-18 -10dB IN -20
-22 10 100 1000 10000 30000
FREQUENCY (Hz)
Figure 9. Expandor Output Frequency Response
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SA575
COMPRESSOR IN +10dB +5dB EXPANDOR OUT +10dB
100mV 0dB
0dB
100mV 0dB
-5dB
-10dB
-10dB
-10dB
-15dB
-20dB
-20dB
-20dB
-25dB
-30dB
-30dB
-40dB
-40dB
-50dB
-50dB
COMPRESSION
}
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Figure 10. The Companding Function
}
EXPANSION
SA575
ORDERING INFORMATION
Device SA575D SA575DR2 SA575DR2G SA575DTB SA575DTBR2 SA575N Package SOIC-20 WB SOIC-20 WB SOIC-20 WB (Pb-Free) TSSOP-20* TSSOP-20* PDIP-20 Temperature Range -40 to +85C -40 to +85C -40 to +85C -40 to +85C -40 to +85C -40 to +85C Shipping 38 Units / Rail 1000 / Tape & Reel 1000 / Tape & Reel 75 Units / Rail 2500 Tape & Reel 18 Units / Rail
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. *This package is inherently Pb-Free.
MARKING DIAGRAMS
SOIC-20 WB D SUFFIX CASE 751D
20 SA575D AWLYYWW
TSSOP-20 DTB SUFFIX CASE 948E
PDIP-20 N SUFFIX CASE 738
SA 575 ALYW
SA575N AWLYYWW
1 A WL, L YY, Y WW, W = Assembly Location = Wafer Lot = Year = Work Week
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SA575
PACKAGE DIMENSIONS
SO-20 WB CASE 751D-05 ISSUE G
D
A
11 X 45 _
q
NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L q MILLIMETERS MIN MAX 2.35 2.65 0.10 0.25 0.35 0.49 0.23 0.32 12.65 12.95 7.40 7.60 1.27 BSC 10.05 10.55 0.25 0.75 0.50 0.90 0_ 7_
H
M
B
M
20
10X
0.25
E
1
10
20X
B 0.25
M
B TA
S
B
S
A
SEATING PLANE
h
18X
e
A1
T
C
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L
SA575
PACKAGE DIMENSIONS
TSSOP-20 DTB SUFFIX CASE 948E-02 ISSUE B
20X
K REF
M
0.15 (0.006) T U
S
0.10 (0.004)
TU
S
V
S
B L
PIN 1 IDENT 1 10
J J1
-U-
N 0.15 (0.006) T U
S
A -V- N F
C D 0.100 (0.004) -T- SEATING
PLANE
G
H
DETAIL E
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IIII IIII IIII
SECTION N-N M DETAIL E
2X
L/2
20
11
K K1
0.25 (0.010)
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7. DIMENSION A AND B ARE TO BE DETERMINED AT DATUM PLANE -W-. MILLIMETERS MIN MAX 6.40 6.60 4.30 4.50 --- 1.20 0.05 0.15 0.50 0.75 0.65 BSC 0.27 0.37 0.09 0.20 0.09 0.16 0.19 0.30 0.19 0.25 6.40 BSC 0_ 8_ INCHES MIN MAX 0.252 0.260 0.169 0.177 --- 0.047 0.002 0.006 0.020 0.030 0.026 BSC 0.011 0.015 0.004 0.008 0.004 0.006 0.007 0.012 0.007 0.010 0.252 BSC 0_ 8_
-W-
DIM A B C D F G H J J1 K K1 L M
SA575
PACKAGE DIMENSIONS
-A-
20 1 11
PDIP-20 N SUFFIX CASE 738-03 ISSUE E
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. DIM A B C D E F G J K L M N INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0_ 15_ 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01
B
10
C
L -T-
SEATING PLANE
K M E G F D
20 PL
N J 0.25 (0.010)
M 20 PL
0.25 (0.010) TA
M
M
TB
M
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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SA575/D

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