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| Final Electrical Specifications LTC1542 Micropower Op Amp and Comparator April 1998 FEATURES s s s s s s DESCRIPTION The LTC(R)1542 combines a micropower amplifier and comparator in an 8-pin package. The part operates from a single 2.5V to 12.6V or dual 1.25V to 6.3V supply with a typical supply current of 5A. Both the op amp and comparator feature a common mode input voltage range that extends from the negative supply to within 1.3V of the positive supply. The op amp output stage swings from rail to rail. The input current is 10pA typical for both op amp and comparator. The op amp is internally compensated to be unity-gain stable with typical GBW at 12kHz and slew rate of 8V/ms. The comparator has 3mV of internal hysteresis to ensure clean output switching, even with slow moving input signals. The LTC1542 is available in MSOP and SO-8 packages. s s s s Quiescent Current: 5A Typ Outputs Swing Rail-to-Rail Low Op Amp Offset Voltage: 700V Max Low Input Bias Current: 1nA Max Internal 3mV Comparator Hysteresis Comparator and Op Amp Input Range Includes Ground Op Amp Capable of Driving Up to 1000pF Load Unity-Gain Stable with 12kHz Bandwidth 2.5V to 12.6V Supply Voltage Range Pin Compatible Upgrade for MAX953 Daisy-Chained Control Outputs APPLICATIONS s s s s s s Battery- or Solar-Powered Systems Automotive Keyless Entry Low Frequency, Local Area Alarms/Detectors Infrared Receivers for Remote Controls Smoke Detectors and Safety Sensors GSM Portable Phones , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION Voltage Control Oscillator C1 0.047F VCC 2 50 VCC = 5V VSS = 0V 40 6 R1 300k VIN 0V - VCC 1M R2 150k 1M LTC1542 OP AMP 3 1 - + LTC1542 COMP 7 5V 0V VOUT PERCENT OF UNITS (%) - + 8 R4 5M 4 5 VC FREQ 2.4C * R1 * VCC VALUES SHOWN ARE FOR 100Hz WITH VIN = VCC R4 1.1M VN2222 VN2222 R3 500k 1542 TA01 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U U U Op Amp VOS Distribution, VCM = 2.5V, SO-8 Package Total of 839 Units 30 20 10 0 -100 0 300 -300 INPUT OFFSET VOLTAGE (V) 600 1542 TA02 1 LTC1542 ABSOLUTE MAXIMUM RATINGS Supply Voltage ........................................................ 13V Input Voltage .............................................- 0.3V to 13V Output Voltage ...........................................- 0.3V to 13V Output Short-Circuit Duration .......................... Indefinite Storage Temperature Range ................. - 65C to 150C Operating Temperature Range Commercial ............................................. 0C to 70C Industrial ............................................ - 40C to 85C Lead Temperature (Soldering, 10 sec).................. 300C PACKAGE/ORDER I FOR ATIO TOP VIEW AMPOUT AMPIN - AMPIN+ VSS 1 2 3 4 8 7 6 5 VCC COMPOUT COMPIN - COMPIN + ORDER PART NUMBER LTC1542CMS8 MS8 PART MARKING LTDE MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125C, JA = 250C/W Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS SYMBOL Power Supply VCC ICC Supply Voltage Range Supply Current (Note 1) PARAMETER CONDITIONS VCC = 5V, VSS = 0V, TA = 25C, unless otherwise noted. MIN q Commercial Grade Industrial Grade Comparator VOS Input Offset Voltage (Note 2) (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) (MSOP) VTRIP IIN VCM CMRR Trip Point (Note 3) Input Leakage Current Input Common Mode Range Common Mode Rejection Ratio VCM = 1/2VCC q VCOMPIN+ = VCOMPIN- = 2.5V VCM = VSS to VCC - 1.3V Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade Industrial Grade Overdrive = 10mV Overdrive = 100mV PSRR Power Supply Rejection Ratio tPD Propagation Delay 2 U U W WW U W TOP VIEW AMPOUT 1 AMPIN- 2 AMPIN+ 3 VSS 4 8 7 6 5 VCC COMPOUT COMPIN - COMPIN + ORDER PART NUMBER LTC1542CS8 LTC1542IS8 S8 PART MARKING 1542 1542I S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 150C/W TYP MAX 12.6 UNITS V A A A mV mV mV mV mV mV mV nA V mV/V mV/V mV/V mV/V mV/V mV/V s s 2.5 5 q q 7.5 13 14 1 1.5 2.0 1.2 2.0 q q q 1.7 1 VSS 2.25 0.01 2.8 3.8 1 VCC - 1.3V 0.25 0.30 0.35 0.25 0.30 0.35 q q q q q q 20 8 LTC1542 ELECTRICAL CHARACTERISTICS SYMBOL VOH VOL Op Amp VOS Input Offset Voltage VCM = 2.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) VCM = 2.5V (MSOP) q q q VCC = 5V, VSS = 0V, TA = 25C, unless otherwise noted. MIN q VCC - 0.2V q PARAMETER Output High Voltage Output Low Voltage CONDITIONS IOUT = - 2mA IOUT = 1.8mA TYP MAX VSS + 0.3V 0.7 1.25 1.5 1.00 1.75 UNITS V V mV mV mV mV mV nA V/mV V/mV V/mV V/mV kHz V/ms IB AVOL Input Bias Current Large-Signal Gain VCM = 2.5V AMPOUT = 0.5V to 4.5V, No Load AMPOUT = 0.5V to 4.5V, RLOAD = 100k Commercial Grade Industrial Grade AV = 1V/V AV = 1V/V q 0.01 80 60 38 35 1000 500 1 q q GBW SR VCM CMRR Gain Bandwidth Slew Rate Input Common Mode Range Common Mode Rejection Ratio 12 8 q VSS VCC - 1.3V 0.28 0.33 0.38 0.19 0.21 0.23 V mV/V mV/V mV/V mV/V mV/V mV/V V V V VCM = VSS to VCC - 1.3V Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade Industrial Grade RLOAD = 100k to VSS Commercial Grade Industrial Grade RLOAD = 100k to VSS Commercial Grade Industrial Grade q q q q q q q q q PSRR Power Supply Rejection Ratio VOH Output High Voltage VCC - 0.07 VCC - 0.10 VCC - 0.12 VSS + 0.05 VSS + 0.10 VSS + 0.12 0.9 0.7 1.3 0.9 1.8 1.8 3 VOL Output Low Voltage V V V mA mA mA mA VP-P ISOURCE ISINK en Output Source Current Output Sink Current q Input Noise Voltage fO = 0.1Hz to 10Hz VCC = 3V, VSS = 0V, TA = 25C, unless otherwise noted. SYMBOL Power Supply VCC ICC Supply Voltage Range Supply Current (Note 1) Commercial Grade Industrial Grade q q q PARAMETER CONDITIONS MIN 2.5 TYP MAX 12.6 UNITS V A A A 4.5 7.0 12 13 3 LTC1542 ELECTRICAL CHARACTERISTICS SYMBOL Comparator VOS Input Offset Voltage (Note 2) PARAMETER CONDITIONS VCC = 3V, VSS = 0V, TA = 25C, unless otherwise noted. MIN TYP MAX 1.0 1.5 2.0 1.2 2.0 1.8 1.00 VSS 2.35 0.01 2.9 3.9 1 VCC - 1.3 0.35 0.40 0.45 0.25 0.30 0.35 25 12 q q UNITS mV mV mV mV mV mV mV nA V mV/V mV/V mV/V mV/V mV/V mV/V s s V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) (MSOP) q q q VTRIP IIN VCM CMRR Trip Point (Note 3) Input Leakage Current Input Common Mode Range Common Mode Rejection Ratio VCM = 1/2VCC q VCOMPIN+ = VCOMPIN- = 1.5V VCM = VSS to VCC - 1.3V Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade Industrial Grade Overdrive = 10mV Overdrive = 100mV IOUT = - 2mA IOUT = 1.8mA VCM = 1.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) VCM = 1.5V (MSOP) q q q q q q PSRR Power Supply Rejection Ratio tPD VOH VOL Op Amp VOS Propagation Delay Output High Voltage Output Low Voltage Input Offset Voltage VCC - 0.2 VSS + 0.3 0.70 1.25 1.50 1.00 1.75 0.01 80.0 45.5 22.0 20.0 1000 500 1 V mV mV mV mV mV nA V/mV V/mV V/mV V/mV kHz V/ms q q q IB AVOL Input Bias Current Large-Signal Gain VCM = 1.5V AMPOUT = 0.5V to 2.5V, No Load AMPOUT = 0.5V to 2.5V, RLOAD = 100k Commercial Grade Industrial Grade AV = 1V/V AV = 1V/V q q q GBW SR VCM CMRR Gain Bandwidth Slew Rate Input Common Mode Range Common Mode Rejection Ratio 12 8 q VSS VCC - 1.3 0.4 0.5 1.0 0.19 0.21 0.23 V mV/V mV/V mV/V mV/V mV/V mV/V V V V VCM = VSS to VCC - 1.3V Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade Industrial Grade RLOAD = 100k to VSS Commercial Grade Industrial Grade RLOAD = 100k to VCC Commercial Grade Industrial Grade q q q q q q q q PSRR Power Supply Rejection Ratio VOH Output High Voltage VCC - 0.07 VCC - 0.10 VCC - 0.12 VCC + 0.05 VCC + 0.10 VCC + 0.12 VOL Output Low Voltage V V V 4 LTC1542 ELECTRICAL CHARACTERISTICS SYMBOL ISOURCE ISINK en PARAMETER Output Source Current CONDITIONS VCC = 3V, VSS = 0V, TA = 25C, unless otherwise noted. MIN q TYP 0.95 1.8 3 MAX UNITS mA mA mA mA VP-P 0.6 0.4 1.2 0.8 Output Sink Current q Input Noise Voltage fO = 0.1Hz to 10Hz The q denotes specifications which apply over the full operating temperature range. Note 1: Supply current is tested with COMPIN + = 0V, COMPIN - = 100mV. Note 2: Input offset voltage is defined as the center of the input referred hysteresis, VCM = 1/2VCC. Note 3: Trip point is defined as the differential input voltage required to make the comparator output change state. The difference between upper and lower trip point is equal to the width of the input referred hysteresis. PIN FUNCTIONS AMPOUT (Pin 1): Op Amp Output. The output can swing from rail to rail while driving a capacitive load of up to 1000pF. The output can source and sink 0.7mA minimum. AMPIN- (Pin 2): Inverting Input of Op Amp. The input common mode ranges from VSS to VCC - 1.3V. The input current is typically 10pA at 25C. AMPIN+ (Pin 3): Noninverting Input of Op Amp. The input common mode ranges from VSS to VCC - 1.3V. The input current is typically 10pA at 25C. VSS (Pin 4): Negative Supply or Ground Connection. COMPIN+ (Pin 5): Noninverting Input of Comparator. The input common mode ranges from VSS to VCC - 1.3V. The input current is typically 10pA at 25C. COMPIN - (Pin 6): Inverting Input of Comparator. The input common mode ranges from VSS to VCC -1.3V. The input current is typically 10pA at 25C. COMPOUT (Pin 7): Comparator Output. The output can source 20mA and sink 5mA. VCC (Pin 8): Positive Supply, 2.5V VCC 12.6V. The supply bypass capacitors are not required if the supply impedance is low. For single supply applications, it is a good general practice to bypass VCC with a 0.1F capacitor to ground. BLOCK DIAGRAMS LTC1542 W U U U + 1 AMPOUT OP AMP VCC 8 COMPOUT 7 - - 2 AMPIN COMP 3 AMPIN + - + COMPIN - 6 4 VSS COMPIN+ 5 1542 BD 5 LTC1542 APPLICATIONS INFORMATION The LTC1542 is a combination of a micropower op amp and comparator in an 8-pin package. The supply voltage range is from 2.5V to 12.6V for a single supply and 1.25V to 6.3V for dual supplies. The supply current is a mere 5A (typical) with a 5V single supply. Op Amp The op amp is internally compensated to be unity-gain stable, with typical GBW at 12kHz and slew rate of 8V/ms. The output can drive a capacitive load of up to 1000pF and swings from rail to rail. The input range is from the negative rail to within 1.3V of the positive rail. The input bias current is less than 1nA maximum at the extended temperature range. Comparator The comparator has a high impedance differential input stage with a common input range from the negative rail to within 1.3V of the positive rail. The CMOS output stage can swing from rail to rail and source up to 20mA continuously. The output stage has been designed to eliminate the power supply glitches that normally occur when the output changes logic state. In addition, an internal hysteresis (3mV) ensures clean output switching even with slow moving input signals. Op Amp Stability Unlike other industry standard micropower CMOS op amps, the op amp in the LTC1542 maintains stability in unity-gain configuration while driving heavy capacitive loads of up to 1000pF. Although this family is primarily designed for low frequency applications, good layout is extremely important. Low power, high impedance circuits may increase the effects of board leakage and stray capacitance. For example, the combination of a 10M resistance (from leakage between traces on a contaminated, poorly designed PC board) and a 1pF stray capacitance provides a pole at approximately 16kHz, which is near the amplifier's bandwidth. Board routing and layout should minimize leakage and stray capacitance. In some cases, stray capacitance may be unavoidable and it may be necessary to add a small capacitor across the feedback resistor to compensate (Figure 1); select the smallest capacitor value that ensures stability. Inputs The input common mode range for both the op amp and comparator is from the negative supply to within 1.3V of the positive supply. The inputs can be taken more than 300mV below the negative supply without damaging the device if the current out of the pin is limited to less than 1mA. Unlike the bipolar input op amp and comparator, the output of the LTC1542 will not reverse phase when the inputs are taken above the common mode input range. AMPIN + 6 U W U U + OP AMP AMPOUT AMPIN - - R2 2pF TO 10pF R1 1542 F01 Figure 1. Compensation for Feedback Node Capacitance LTC1542 PACKAGE DESCRIPTION 0.007 (0.18) 0.021 0.006 (0.53 0.015) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP 0.016 - 0.050 0.406 - 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE U Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.118 0.004* (3.00 0.102) 8 76 5 0.192 0.004 (4.88 0.10) 0.118 0.004** (3.00 0.102) 1 0.040 0.006 (1.02 0.15) 0 - 6 TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) TYP 23 4 0.034 0.004 (0.86 0.102) 0.006 0.004 (0.15 0.102) MSOP (MS8) 1197 S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 - 0.197* (4.801 - 5.004) 8 7 6 5 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 1 0.053 - 0.069 (1.346 - 1.752) 2 3 4 0.004 - 0.010 (0.101 - 0.254) 0.014 - 0.019 (0.355 - 0.483) 0.050 (1.270) TYP SO8 0996 7 LTC1542 TYPICAL APPLICATIONS Negative Reference VCC 3V TO 9V 200k VCC 3V TO 12V 5M 2 5M 3 FREQ RELATED PARTS PART NUMBER LT(R) 1078/LT1079 LT1178/LT1179 LT1490/LT1491 LT1635 LT2078/LT2079 LT2178/LT2179 LTC1541 DESCRIPTION Dual/Quad Micropower, Single Supply Precision Op Amps Dual/Quad 17A Max, Single Supply Precision Op Amps Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps Micropower Rail-to-Rail Op Amp and Reference Dual/Quad Micropower, Single Supply Precision Op Amps Dual/Quad 17A Max, Single Supply Precision Op Amps Micropower Op Amp, Comparator and Reference COMMENTS 70V, VOS Max and 0.4V/C Drift, 200kHz GBW, 0.07V/s Slew Rate, Input/Output Common Mode Includes Ground 70V, VOS Max and 2.5V/C Drift Max, 85kHz GBW, 0.04V/s Slew Rate, Input/Output Common Mode Includes Ground Single Supply Input Range: - 0.4V to 44V, Micropower 50A Amplifier, Rail-to-Rail Input and Output, 200kHz GBW 130A of Supply Current, 1.3mV VOS Max SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 200kHz GBW SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 85kHz GBW Internal 1.2V 0.8% Reference with Comparator and Op Amp 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507 q TELEX: 499-3977 q www.linear-tech.com U 2 - + 8 1 LT1634-2.5 VOUT -2.5V 3 LTC1542 OP AMP 4 VSS -3V 1542 TA03 Single Supply Function Generator 0.1F - + 8 1 LTC1542 OP AMP 4 R2 500k 6 - + LTC1542 COMP 7 R1 10M 5 R3 5M 1542 TA04 R1 4C * R2 * R3 1542i LT/TP 0498 4K * PRINTED IN USA (c) LINEAR TECHNOLOGY CORPORATION 1998 |
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