LT 2178/LT 2179 17µA Max, Dual and Quad, Single Supply, Precision Op Amps U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION SO Package with Standard Pinout Supply Current per Amplifier: 17µA Max Offset Voltage: 70µV Max Offset Current: 250pA Max Input Bias Current: 5nA Max Voltage Noise: 0.9µVP-P, 0.1Hz to 10Hz Current Noise: 1.5pAP-P, 0.1Hz to 10Hz Offset Voltage Drift: 0.5µV/°C Gain Bandwidth Product: 85kHz Slew Rate: 0.04V/µs Single Supply Operation Input Voltage Range Includes Ground Output Swings to Ground while Sinking Current No Pull-Down Resistors Needed Output Sources and Sinks 5mA Load Current U APPLICATIONS ■ ■ ■ ■ Battery- or Solar-Powered Systems Portable Instrumentation Remote Sensor Amplifier Satellite Circuitry Micropower Sample-and-Hold Thermocouple Amplifier Micropower Filters , LTC and LT are registered trademarks of Linear Technology Corporation. The LT ®2178 is a micropower dual op amp in a surface mount standard 8-pin configuration, the LT2179 is a micropower quad op amp offered in a surface mount 14-pin package. Both devices are optimized for single supply operation at 5V. Specifications are also provided at ±15V supply. The extremely low supply current is combined with true precision specifications: offset voltage is 30µV and offset current is 50pA. Both offset parameters have low drift with temperature. The 1.5pAP-P current noise and picoampere offset current permit the use the megohm level source resistors without introducing serious errors. Voltage noise, at 0.9µVP-P, is remarkably low considering the low supply current. The LT2178/LT2179 can be operated from a single supply (as low as one lithium-cell or two NiCd batteries). The input range goes below ground. The all-NPN output stage swings to within a few millivolts of ground while sinking current. No power consuming pull down resistors are needed. For surface mount applications where three times higher supply current is acceptable, the micropower LT1077 single, LT2078 dual and LT2079 quad are recommended. The LT1077/LT2078/LT2079 have significantly higher bandwidth, slew rate, lower voltage noise and better output drive capability. For applications requiring DIP packages refer to the LT1178/LT1179. U TYPICAL APPLICATION Self-Buffered, Dual Output, Micropower Reference – 1/2 LT2178 3 1 + 1.2365V OUTPUT 4V TO 9V 4 5 + 6 – 250k TOTAL BATTERY CURRENT = 28 µA OUTPUT ACCURACY = ±0.4% MAX TEMPERATURE COEFFICIENT = 20ppm/ °C LOAD REGULATION = 25ppm/mA, I L ≤ 5mA, V+ ≥ 5V LINE REGULATION = 10ppm/V * 0.1% FILM RESISTORS 8 1/2 LT2178 7 2.470V OUTPUT 2M 0.1µF 0.1µF LT1004-1.2 1M* 1M* LT2178/79 • TA01 SUPPLY CURRENT PER AMPLIFIER (µA) 2 Supply Current vs Temperature 20 18 VS = ±15V 16 14 VS = 5V, 0V 12 VS = ±1.5V 10 –50 –25 25 50 0 TEMPERATURE (°C) 75 100 LT2178/79 • TPC02 1 LT2178/LT 2179 W W U W ABSOLUTE MAXIMUM RATINGS Supply Voltage ...................................................... ±22V Differential Input Voltage ....................................... ±30V Input Voltage ............... Equal to Positive Supply Voltage ............ 5V Below Negative Supply Voltage Output Short-Circuit Duration .......................... Indefinite Specified Temperature Range Commercial ............................................. 0°C to 70°C Industrial ............................................ – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C W U U PACKAGE/ORDER INFORMATION OUT A 1 –IN A 2 +IN A 3 – + A V– 4 – B+ 8 V+ 7 OUT B 6 –IN B 5 +IN B LT2178ACS8 LT2178AIS8 LT2178CS8 LT2178IS8 PART MARKING S8 PACKAGE 8-LEAD PLASTIC SO 2178A 2178 2178AI 2178I TJMAX = 150°C, θJA = 190°C/ W 14 OUT D OUT A 1 –IN A 2 – +IN A 3 + – A D+ V+ 4 +IN B 5 –IN B 6 13 –IN D LT2179ACS LT2179AIS LT2179CS LT2179IS 12 +IN D 11 V – + –B C OUT B 7 – TOP VIEW ORDER PART NUMBER TOP VIEW + ORDER PART NUMBER 10 +IN C 9 –IN C 8 OUT C S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/ W Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. CONDITIONS (NOTE 1) LT2178AC/LT2178AI LT2179AC/LT2179AI MIN TYP MAX LT2178C/LT2178I LT2179C/LT2179I MIN TYP MAX 30 35 40 40 70 100 120 150 µV µV VOS Input Offset Voltage ∆VOS ∆Time Long Term Input Offset Voltage Stability 0.5 IOS Input Offset Current 0.05 0.25 0.05 0.35 nA IB Input Bias Current 3 5 3 6 nA en Input Noise Voltage 0.1Hz to 10Hz (Note 2) 0.9 2.0 0.9 µVP-P Input Noise Voltage Density fO = 10Hz (Note 2) fO = 1000Hz (Note 2) 50 49 75 65 50 49 nV√Hz nV√Hz Input Noise Current 0.1Hz to 10Hz (Note 2) 1.5 2.5 1.5 pAP-P Input Noise Current Density fO = 10Hz (Note 2) fO = 1000Hz 0.03 0.01 0.07 0.03 0.01 pA√Hz pA√Hz Input Resistance Differential Mode Common Mode (Note 3) in LT2178 LT2179 UNITS µV/Mo 0.6 0.8 2.0 12 0.6 2.0 12 GΩ GΩ Input Voltage Range 3.5 0 3.9 – 0.3 3.5 0 3.9 – 0.3 V V CMRR Common Mode Rejection Ratio VCM = 0V to 3.5V 93 103 90 102 dB PSRR Power Supply Rejection Ratio 94 104 92 104 dB 2 VS = 2.2V to 12V LT 2178/LT 2179 ELECTRICAL CHARACTERISTICS CONDITIONS (NOTE 1) LT2178AC/LT2178AI LT2179AC/LT2179AI MIN TYP MAX LT2178C/LT2178I LT2179C/LT2179I MIN TYP MAX Large-Signal Voltage Gain VO = 0.03V to 4V, No Load (Note 3) VO = 0.03V to 3.5V, RL = 50k 140 80 110 70 Maximum Output Voltage Swing Output Low, No Load Output Low, 2k to GND Output Low, ISINK = 100µA SYMBOL PARAMETER AVOL VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. 700 200 6.5 0.2 120 Output High, No Load Output High, 2k to GND 9 0.6 160 700 200 6.5 0.2 120 UNITS V/mV V/mV 9 0.6 160 mV mV mV 4.2 3.5 4.4 3.8 4.2 3.5 4.4 3.8 0.013 0.025 0.013 0.025 V/µs 60 kHz SR Slew Rate AV = 1, CL = 10pF (Note 3) GBW Gain Bandwidth Product fO ≤ 5kHz 60 IS Supply Current per Amplifier VS = ±1.5V, VO = 0V 13 12 Channel Separation ∆VIN = 3V, RL = 10k 110 Minimum Supply Voltage (Note 4) 2.0 18 17 14 13 V V 21 20 110 2.2 2.0 µA µA dB 2.2 V VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, – 40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted. (Note 6) SYMBOL PARAMETER CONDITIONS LT2178AI/LT2179AI MIN TYP MAX LT2178I/LT2179I MIN TYP MAX UNITS VOS Input Offset Voltage LT2178 LT2179 ● ● 70 80 270 300 95 100 370 400 µV µV ∆VOS ∆T Input Offset Voltage Drift LT2178 (Note 5) LT2179 ● 0.4 0.5 1.8 3.0 0.5 0.6 2.5 3.5 µV/°C µV/°C IOS Input Offset Current ● 0.07 0.70 0.1 1.0 nA IB Input Bias Current ● 3 7 4 8 nA CMRR Common Mode Rejection Ratio VCM = 0.05V to 3.2V ● 86 100 84 98 dB PSRR Power Supply Rejection Ratio VS = 3V to 12V ● 88 100 86 100 dB AVOL Large-Signal Voltage Gain VO = 0.05V to 4V, No Load (Note 3) VO = 0.05V to 3.5V, RL = 50k ● ● 75 40 350 130 50 30 350 130 V/mV V/mV Maximum Output Voltage Swing Output Low, No Load Output Low, ISINK = 100µA ● ● Output High, No Load Output High, 2k to GND ● ● IS Supply Current per Amplifier 9 160 3.9 3.0 4.2 3.7 15 ● 13 220 9 160 3.9 3.0 24 13 220 4.2 3.7 15 mV mV V V 27 µA VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 7) SYMBOL PARAMETER CONDITIONS LT2178AC/LT2179AC MIN TYP MAX LT2178C/LT2179C MIN TYP MAX UNITS VOS Input Offset Voltage LT2178 LT2179 ● ● 50 60 170 200 65 70 250 290 µV µV ∆VOS ∆T Input Offset Voltage Drift LT2178 (Note 5) LT2179 ● 0.4 0.5 1.8 3.0 0.5 0.6 2.5 3.5 µV/°C µV/°C IOS Input Offset Current ● 0.06 0.35 0.06 0.50 nA IB Input Bias Current ● 3 6 3 7 nA CMRR Common Mode Rejection Ratio VCM = 0V to 3.4V ● 90 101 86 100 dB PSRR Power Supply Rejection Ratio ● 90 102 88 102 dB VS = 2.5V to 12V 3 LT2178/LT 2179 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER AVOL IS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. LT2178AC/LT2179AC MIN TYP MAX CONDITIONS Large-Signal Voltage Gain VO = 0.05V to 4V, No Load (Note 3) VO = 0.05V to 3.5V, RL = 50k ● ● Maximum Output Voltage Swing Output Low, No Load Output Low, ISINK = 100µA ● ● Output High, No Load Output High, 2k to GND ● ● Supply Current per Amplifier 150 55 500 160 8 140 4.1 3.3 80 45 11 190 4.3 3.8 14 ● LT2178C/LT2179C MIN TYP MAX 500 160 8 140 4.1 3.3 21 V/mV V/mV 11 190 4.3 3.8 15 UNITS mV mV V V 24 µA VS = ±15V, TA = 25°C, unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage IOS Input Offset Current IB Input Bias Current CONDITIONS LT2178 LT2179 Input Voltage Range LT2178AC/LT2178AI LT2179AC/LT2179AI MIN TYP MAX 70 300 80 350 LT2178C/LT2178I LT2179C/LT2179I MIN TYP MAX 90 400 100 450 0.05 0.25 0.05 0.35 nA 3 5 3 6 nA UNITS µV µV 13.5 –15.0 13.9 –15.3 13.5 –15.0 13.9 –15.3 V V CMRR Common Mode Rejection Ratio VCM = 13.5V to –15V 96 106 93 106 dB PSRR Power Supply Rejection Ratio VS = 5V, 0V to ±18V 96 112 94 112 dB AVOL Large-Signal Voltage Gain VO = ±10V, RL = 50k VO = ±10V, No Load 300 600 1200 2500 250 400 1000 2500 V/mV V/mV VOUT Maximum Output Voltage Swing RL = 50k RL = 2k ±13.0 ±11.0 ±14.2 ±12.7 ±13.0 ±11.0 ±14.2 ±12.7 V V SR Slew Rate AV = 1 0.02 0.04 0.02 0.04 V/µs GBW Gain Bandwidth Product fO ≤ 5kHz 85 kHz IS Supply Current per Amplifier 85 16 21 17 25 µA VS = ±15V, – 40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted. SYMBOL PARAMETER CONDITIONS LT2178AI/LT2179AI MIN TYP MAX LT2178I/LT2179I MIN TYP MAX UNITS VOS Input Offset Voltage LT2178 LT2179 ● ● 100 100 650 650 130 130 740 740 µV µV ∆VOS ∆T Input Offset Voltage Drift LT2178 (Note 5) LT2179 ● 0.6 0.7 1.8 3.0 0.7 0.9 2.5 4.0 µV/°C µV/°C IOS Input Offset Current ● 0.07 0.70 0.1 1.0 nA IB Input Bias Current ● 3 7 4 8 nA AVOL Large-Signal Voltage Gain CMRR Common Mode Rejection Ratio VCM = 13V, –14.9V PSRR Power Supply Rejection Ratio IS 4 VO = ±10V, RL = 50k ● 150 500 100 500 V/mV ● 90 105 88 103 dB ● 92 110 88 109 dB Maximum Output Voltage Swing RL = 5k ● ±11.0 ±13.5 ±11.0 ±13.5 Supply Current per Amplifier ● VS = 0V, 5V to ±18V 18 28 19 V 30 µA LT 2178/LT 2179 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. CONDITIONS LT2178AC/LT2179AC MIN TYP MAX LT2178C/LT2179C MIN TYP MAX UNITS VOS Input Offset Voltage LT2178 LT2179 ● ● 100 120 480 550 130 150 660 750 µV µV ∆VOS ∆T Input Offset Voltage Drift LT2178 (Note 5) LT2179 ● 0.6 0.7 1.8 3.0 0.7 0.9 2.5 4.0 µV/°C µV/°C IOS Input Offset Current ● 0.06 0.35 0.06 0.35 nA IB Input Bias Current ● 3 6 3 7 nA AVOL Large-Signal Voltage Gain VO = ±10V, RL = 50k ● 200 800 150 750 V/mV CMRR Common Mode Rejection Ratio VCM = 13V, –15V ● 94 104 91 104 dB PSRR Power Supply Rejection Ratio VS = 5V, 0V to ±18V ● 93 110 91 110 dB Maximum Output Voltage Swing RL = 5k ● ±11.0 ±13.6 ±11.0 ±13.6 V IS Supply Current per Amplifier 17 ● The ● denotes specifications which apply over the full operating temperature range. Note 1: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers, i.e., out of 100 LT2179s (or 100 LT2178s) typically 240 op amps (or 120) will be better than the indicated specification. Note 2: This parameter is tested on a sample basis only. All noise parameters are tested with VS = ±2.5V, VO = 0V. Note 3: This parameter is guaranteed by design and is not tested. 24 18 µA 28 Note 4: Power supply rejection ratio is measured at the minimum supply voltage. The op amps actually work at 1.7V supply but with a typical offset skew of –300µV. Note 5: This parameter is not 100% tested. Note 6: During testing at –40°C, the 5V power supply turn-on time is less than 0.5s. Note 7: The LT2178C/LT2179C are designed, characterized and expected to meet the industrial temperature limits, but are not tested at – 40°C and 85°C. I-grade parts are guaranteed. U W TYPICAL PERFORMANCE CHARACTERISTICS Distribution of Input Offset Voltage 200 0 –100 85°C 25°C – 40°C –300 NONFUCTIONAL –500 100 –50 0 50 OFFSET VOLTAGE (µV) 150 LT2178/79 • TPC01 IOS 50 25 –400 0 –150 –100 VS = 5V, 0V 75 –200 0 2 3 1 POSITIVE SUPPLY VOLTAGE (V) LT2178/79 • TPC02 –2.5 INPUT BIAS CURRENT (nA) 400 INPUT OFFSET CURRENT (pA) V – = 0V VS = 5V, 0V TA = 25°C 2500 OP AMPS TESTED OFFSET VOLTAGE SHIFT (µV) NUMBER OF OP AMPS 100 100 800 600 Input Bias and Offset Currents vs Temperature Minimum Supply Voltage –3.0 IB –3.5 –4.0 –50 –25 50 25 0 TEMPERATURE (°C) 75 100 LT2178/79 • TPC03 5 LT2178/LT 2179 U W TYPICAL PERFORMANCE CHARACTERISTICS Output Saturation vs Temperature vs Sink Current SHORT CIRCUIT CURRENT (mA) SINKING SOURCING VS = 5V, 0V ISINK = 1mA ISINK = 100µA ISINK = 1µA 10 NO LOAD 10k TO GROUND 1 2k TO GROUND 0.1 –50 10 VS = ±2.5V VS = 5V, 0V 0 VS = ±2.5V –10 VS = ±15V –20 CHANNEL B –25 0 25 50 TEMPERATURE (°C) 75 100 0 2 1 TIME FROM OUTPUT SHORT TO GROUND (MINUTES) VOLTAGE NOISE DENSITY (nV√Hz) CURRENT NOISE DENSITY (fA√Hz) NOISE VOLTAGE (0.4µV/DIV) CHANNEL A CHANNEL B 100 TA = 25°C VS = ±2.5V 300 CURRENT NOISE VOLTAGE NOISE 1 160 180 GAIN 5V, 0V 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) LT2178/79 • TPC09 Capacitive Load Handling 120 100k 240 1M VS = 5V, 0V, TA = 25°C VS = 5V, 0V, TA = 85°C 10k 10k 100k 1M LOAD RESISTANCE TO GROUND (Ω) VS = 5V, 0V 100 80 60 AV = 1 40 AV = 5 20 220 100k FREQUENCY (Hz) –20 0.001 0.01 0.1 1000 1M 200 LT2178/79 • TPC10 6 VOLTAGE GAIN (V/V) 140 PHASE SHIFT (DEG) VOLTAGE GAIN (dB) 120 10 –10 10k 10 100 FREQUENCY (Hz) VS = ±15V, TA = 25°C 100 PHASE 5V, 0V, VS = 5V, 0V 40 Voltage Gain vs Load Resistance TA = 25°C NO LOAD VS = ±15V 60 0 10M 80 GAIN ±15V 80 LT2178/79 • TPC08 Gain, Phase vs Frequency 20 100 20 1/f CORNER 0.5Hz LTC2178/79 • TPC07 PHASE ±15V TA = 25°C 120 100 30 12 140 10 0.1 120 30 10 Voltage Gain vs Frequency Noise Spectrum 40 60 80 TIME (SECONDS) 4 6 8 TIME (SECONDS) 2 LTC2178/79 • TPC06 1000 TA = 25°C, VS = ±2.5V 20 0 LT2178/79 • TPC05 0.01Hz to 10Hz Noise 0 CHANNEL A –30 LT2178/79 • TPC04 0 TA = 25°C, VS = ±2.5V VS = ±15V VOLTAGE GAIN (dB) 100 0.1Hz to 10Hz Noise OVERSHOOT (%) SATURATION VOLTAGE (mV) Short-Circuit Current 20 NOISE VOLTAGE (0.4µV/DIV) 1000 10M LT2178/79 • TPC11 0 10 AV = 10 100 1000 CAPACITIVE LOAD (pF) 10000 LT2078/79 • TPC12 LT 2178/LT 2179 U W TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Transient Response VS = 5V, 0V 20mV/DIV Small-Signal Transient Response VS = ±2.5V 1V/DIV 5V/DIV Large-Signal Transient Response VS = ±15V AV = 1 CL = 12pF 500µs/DIV AV = 1 100µs/DIV CL = 12pF INPUT PULSE = 0V TO 3.8V LT2178/79 • TPC13 Small-Signal Transient Response VS = ±15V AV = 1 CL = 12pF 20µs/DIV LT2178/79 • TPC15 LT2178/79 • TPC14 Small-Signal Transient Response VS = 5V, 0V Common Mode Rejection Ratio vs Frequency COMMON MODE REJECTION RATIO (dB) 20mV/DIV 20mV/DIV 120 AV = 1 CL = 12pF 20µs/DIV AV = 1 20µs/DIV CL = 12pF INPUT PULSE = 50mV TO 150mV LT2178/79 • TPC16 LT2178/79 • TPC17 TA = 25°C 100 80 VS = 5V, 0V VS = ±15V 60 40 20 0 1 10 100 1k FREQUENCY (Hz) 10k 100k LT2178/79 • TPC18 Power Supply Rejection Ratio vs Frequency Closed Loop Output Impedance 120 10k POSITIVE SUPPLY 80 PSRR (dB) OUTPUT IMPEDANCE (Ω) 100 NEGATIVE SUPPLY 60 40 20 TA = 25°C VS = ±2.5V + 1VP-P SINE WAVE TA = 25°C VS = 5V, 0V IL = 0 1k ACL = 100 100 ACL = 1 ACL = 10 10 1 0 0.1 1 10k 10 100 1k OPERATING FREQUENCY (Hz) 100k LT2178/79 • TPC19 10 100 1k 10k FREQUENCY (Hz) 100k LT2178/79 • TPC20 7 LT2178/LT 2179 W W SI PLIFIED SCHEMATIC 1/2 LT2178 1/4 LT2179 V+ 10k 10k 2.2k 5.6k Q54 1 Q16 Q6 Q5 Q14 Q15 11.5k 33k 6.4k 1.3k Q53 2 1 Q32 Q52 Q47 Q4 8.6k Q12 4 Q11 Q46 Q37 Q29 Q3 Q30 Q24 1 V– 3 Q40 3k Q25 Q35 C1 50pF V 1 2.9k 30Ω Q44 C5 2.5pF Q27 IN + 600Ω 600Ω Q41 + Q26 C4 4pF OUT IN – 12.5k Q1 Q21 150k Q18 Q28 Q2 Q22 V+ Q31 C3 40pF J1 Q36 Q33 Q48 Q19 Q50 Q42 Q49 Q39 Q9 Q23 Q10 Q17 C2 175pF Q7 Q8 V+ Q34 6.2k 6.2k 9.1k Q45 Q20 2A 3k Q51 Q55 10k Q38 30Ω 700k Q43 2A 5.35k 700k V– LT2178/79 • SIMPLIFIED SCHEM 8 LT 2178/LT 2179 U U W U APPLICATIONS INFORMATION Please see the LT2078/LT2079 data sheet for applications information. All comments relating to specifications, single supply operation and phase reversal protection are directly applicable to the LT2178/LT2179. Micropower 100Hz to 1MHz V-to-F Converter 7V TO 10V 1.5M VIN 0V TO 5V 100k 220k* 50k 1MHz TRIM 100Hz TRIM 240k TYP 2k 1N4148 + NC + 47k A1 1/2 LT2178 – 0.33µF Q8 2N3906 CLK 10M LTC®201 1N1 S1 500pF POLYSTYRENE S3 D1 D3 D2 D4 S2 S4 0.022µF – LT1004-2.5 VDD Q7 CD4024 RESET 74C14 3pF 1µF + A2 1/2 LT2178 Q7 2N3904 0.01µF 2µF + 1µF 12k 100Ω 10k VSS FOUT V+ 1N3 1N4 1N2 LINEARITY IS 0.02% QUIESCENT CURRENT IS 90µA SUPPLY CURRENT IS 360µA AT 1MHz DRIFT = 50ppm/°C *TRWMTR/5 + 120ppm/°C V– GND LT2178/79 • TA03 9 LT2178/LT 2179 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. 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 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 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 10 0.014 – 0.019 (0.355 – 0.483) 2 3 4 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC SO8 0695 LT 2178/LT 2179 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. S Package 14-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.337 – 0.344* (8.560 – 8.738) 14 13 12 11 10 9 8 0.228 – 0.244 (5.791 – 6.197) 0.150 – 0.157** (3.810 – 3.988) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 5 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) 7 0.004 – 0.010 (0.101 – 0.254) 0° – 8° TYP 0.016 – 0.050 0.406 – 1.270 6 0.050 (1.270) TYP *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 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. S14 0695 11 LT2178/LT 2179 U TYPICAL APPLICATION Single Supply, 1kHz, 4th Order Butterworth Lowpass Filter C1 1000pF R1 301k VIN C2 1000pF 1000pF – 1/4 LT2179 R2 86k 1000pF – 121k 1/4 LT2179 + – 221k 1/4 LT2179 + – 1/4 LT2179 + 301k VOUT + 121k 2178/79 TA04 50k 3.3V 50k + 1µF 10 0 –10 12-BIT ACCURATE SIGNAL RANGE FROM 6mV TO 1.8V ON 3.3V SINGLE SUPPLY. MAXIMUM OUTPUT OFFSET ERROR IS 448µV. 1 C1C2R1R2 1 R1 = WOQC1 Q R2 = WOC2 WO2 = GAIN(dB) FOR EACH 2ND ORDER SECTION: –20 –30 –40 –50 –60 –70 –80 –90 0.1 1 FREQUENCY (kHz) 10 LT2178/79 • TA05 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1078/LT1079 Dual/Quad 55µA Max, Single Supply Precision Op Amps 70µV VOS Max and 2.5µV/°C Drift Max, 200kHz BBW, 0.07V/µs Slew Rate, Input/Output Common Mode Includes Ground LT1211/LT1212 14MHz, 7V/µs Single Supply Dual and Quad Precision Op Amps 275µV VOS Max, 6µV/°C Drift Max Input Voltage Range Includes Ground LT1490/LT1491 Dual/ Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: –0.4V to 44V, Micropower 50µA Amplifier, Rail-to-Rail Input and Output, 200kHz GBW LT2078/LT2079 Dual/Quad 55µA Max, Single Supply Precision Op Amps 12 Linear Technology Corporation 70µV VOS Max and 2.5µV/°C Drift Max, 200kHz BBW, 0.07V/µs Slew Rate, Input/Output Common Mode Includes Ground Surface Mount Standard Pinout LT/GP 1196 7K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1996