LT1490A Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Low Input Offset Voltage: 500µV Max Output Swings to 10mV Max from V – Rail-to-Rail Input and Output µA/Amplifier Max Micropower: 50µ MSOP Package Over-The-TopTM Input Common Mode Range Extends 44V Above V –, Independent of V + Specified on 3V, 5V and ±15V Supplies High Output Current: 20mA Output Drives 10,000pF with Output Compensation Reverse Battery Protection to 18V No Supply Sequencing Problems High Voltage Gain: 1500V/mV High CMRR: 98dB No Phase Reversal Gain Bandwidth Product: 200kHz U APPLICATIO S ■ ■ ■ ■ Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring Micropower Active Filters 4mA to 20mA Transmitters , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. U ■ The LT ®1490A is an enhanced version of the popular LT1490 op amp with improved input offset voltage (500µV max) and output voltage swing (10mV max from V –). It is recommended for all new designs. The LT1490A operates on all single and split supplies with a total voltage of 2V to 44V, drawing only 40µA of quiescent current per amplifier. It is reverse supply protected; it draws virtually no current for reverse supply up to 18V. The input range of the LT1490A includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490A can drive heavy loads; its rail-to-rail output drives 20mA. The LT1490A is unity-gain stable and drives all capacitive loads up to 10,000pF when optional 0.22µF and 150Ω compensation is used. The LT1490A has a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 15V. There is no phase reversal of the output for inputs 15V below V – or 44V above V –, independent of V +. The LT1490A dual op amp is available in the 8-pin MSOP, PDIP and SO packages. TYPICAL APPLICATIO Battery Monitor CHARGER VOLTAGE RS 0.2Ω RA 2k IBATT RA´ 2k + Q1 2N3904 1/2 LT1490A – – 1/2 LT1490A LOGIC + RB 2k RB´ 2k LOAD + Q2 2N3904 LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING 1/2 LT1490A – + + RG 10k VBATT = 12V S1 1/2 LT1490A VOUT – 10k 90.9k S1 = OPEN, GAIN = 1 S1 = CLOSED, GAIN = 10 RA = RB VS = 5V, 0V 14901A TA01 VOUT V IBATT = = OUT AMPS (RS)(RG /RA)(GAIN) GAIN 1 LT1490A U W W W ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V + to V –) ............................. 44V Differential Input Voltage ........................................ 44V Input Current ..................................................... ±12mA Output Short-Circuit Duration (Note 2) ........ Continuous Junction Temperature .......................................... 150°C Operating Temperature Range (Note 3) ............................................. – 40°C to 85°C Specified Temperature Range (Note 4) .. – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C U W U PACKAGE/ORDER INFORMATION ORDER PART NUMBER TOP VIEW OUT A –IN A +IN A V– 1 2 3 4 8 V+ 7 OUT B 6 –IN B 5 +IN B LT1490ACMS8 LT1490AIMS8 MS8 PACKAGE 8-LEAD PLASTIC MSOP MS8 PART MARKING TJMAX = 150°C, θJA = 250°C/ W LTNG LTPU ORDER PART NUMBER TOP VIEW OUT A 1 –IN A 2 8 V+ 7 OUT B LT1490ACN8 LT1490ACS8 LT1490AIN8 LT1490AIS8 A +IN A 3 6 –IN B V– 4 5 +IN B N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO B S8 PART MARKING TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 190°C/ W (S8) 1490A 1490AI Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 5) N8, S8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● – 40°C ≤ TA ≤ 85°C VCM = 44V (Note 6) Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current Input Bias Current VCM = 44V (Note 6) VS = 0V MIN TYP MAX UNITS 110 500 700 800 µV µV µV 220 1000 1200 1400 µV µV µV ● 2 4 ● ● 0.2 0.8 0.8 nA µA ● ● 1 3 0.3 8 10 nA µA nA µV/°C Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P en Input Noise Voltage Density f = 1kHz 50 nV/√Hz in Input Noise Current Density f = 1kHz 0.03 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = 0V to 44V 2 6 4 17 11 MΩ MΩ LT1490A ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4) SYMBOL PARAMETER CIN Input Capacitance CONDITIONS MIN TYP MAX 4.6 Input Voltage Range ● 0 UNITS pF 44 V CMRR Common Mode Rejection Ratio (Note 6) VCM = 0V to VCC – 1V VCM = 0V to 44V ● ● 84 80 98 98 AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 200 133 100 1500 ● ● V/mV V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 400 250 200 1500 ● ● V/mV V/mV V/mV VS = 3V, No Load VS = 3V, ISINK = 5mA ● ● 3 250 10 450 mV mV VS = 5V, No Load VS = 5V, ISINK = 5mA VS = 5V, ISINK = 10mA ● ● 3 250 330 10 500 500 mV mV mV VS = 3V, No Load VS = 3V, ISOURCE = 5mA ● ● 2.95 2.55 2.978 2.6 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.95 4.30 4.978 4.6 V V VOL VOH ISC PSRR Output Voltage Swing Low Output Voltage Swing High Short-Circuit Current (Note 2) Power Supply Rejection Ratio VS = 3V, Short to GND VS = 3V, Short to VCC 10 10 15 30 mA mA VS = 5V, Short to GND VS = 5V, Short to VCC 15 15 25 30 mA mA 84 98 VS = 2.5V to 12.5V, VCM = VO = 1V Minimum Operating Supply Voltage Reverse Supply Voltage IS GBW SR dB dB ● 2 ● IS = – 100µA per Amplifier Supply Current per Amplifier (Note 7) ● 18 dB 2.5 27 40 ● V V 50 55 µA µA Gain Bandwidth Product (Note 6) f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 110 100 90 180 ● ● kHz kHz kHz Slew Rate (Note 8) AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 0.035 0.031 0.030 0.06 ● ● V/µs V/µs V/µs The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 5) N8, S8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C MIN ● ● MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● TYP MAX UNITS 150 700 950 1100 µV µV µV 250 1200 1350 1500 µV µV µV 3 LT1490A ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS Input Offset Voltage Drift (Note 9) – 40°C ≤ TA ≤ 85°C MIN TYP MAX UNITS µV/°C ● 2 6 IOS Input Offset Current ● 0.2 0.8 nA IB Input Bias Current ● 1 8 nA Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P en Input Noise Voltage Density f = 1kHz 50 nV/√Hz in Input Noise Current Density f = 1kHz 0.03 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = – 15V to 14V CIN Input Capacitance Input Voltage Range 6 17 15000 MΩ MΩ 4.6 pF ● – 15 CMRR Common Mode Rejection Ratio VCM = – 15V to 29V ● 80 98 dB AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 100 75 50 250 ● ● V/mV V/mV V/mV ±14.9 ±14.5 ±14.5 ±14.978 ±14.750 ±14.670 ±25 VO Output Voltage Swing No Load IOUT = ±5mA IOUT = ±10mA ISC Short-Circuit Current (Note 2) Short to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● ±20 ±15 ±10 VS = ±1.25V to ±22V ● 88 PSRR Power Supply Rejection Ratio IS Supply Current per Amplifier ● ● 29 ● GBW SR Gain Bandwidth Product Slew Rate f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Note 3: The LT1490AC and LT1490AI are guaranteed functional over the operating temperature range of – 40°C to 85°C. Note 4: The LT1490AC is guaranteed to meet specified performance from 0°C to 70°C. The LT1490AC is designed, characterized and expected to meet specified performance from – 40°C to 85°C but is not tested or QA sampled at these temperatures. The LT1490I is guaranteed to meet specified performance from –40°C to 85°C. 4 ● ● ● ● V V V mA mA mA 98 50 V dB 70 85 µA µA 125 110 100 200 kHz kHz kHz 0.0375 0.07 V/µs 0.0330 0.0300 V/µs V/µs Note 5: ESD (Electrostatic Discharge) sensitive device. Extensive use of ESD protection devices are used internal to the LT1490A. However, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions. Note 6: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±15V tests. Note 7: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±15V tests. Note 8: Guaranteed by correlation to slew rate at VS = ±15V and GBW at VS = 3V and VS = ±15V tests. Note 9: This parameter is not 100% tested. LT1490A U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage TA = 125°C 60 TA = 25°C 50 40 TA = –55°C 30 20 10 0 5 0 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 400 5000 300 3000 200 100 TA = –55°C TA = 25°C 0 –100 –200 –300 – 400 45 VS = 5V, 0V INPUT BIAS CURRENT (nA) CHANGE IN INPUT OFFSET VOLTAGE (µV) SUPPLY CURRENT PER AMPLIFIER (µA) 80 70 Input Bias Current vs Common Mode Voltage Minimum Supply Voltage 1 3 4 2 TOTAL SUPPLY VOLTAGE (V) 1 TA = 25°C TA = –55°C 10µ 1m 10m 100µ SOURCING LOAD CURRENT (A) TA = 25°C TA = –55°C 10m 1 2 1µ 10µ 100µ 1m 10m SINKING LOAD CURRENT (A) 7 8 60 50 40 30 9 10 1490A G07 OUTPUT HIGH 20 10 OUTPUT LOW 0 10 30 40 20 INPUT OVERDRIVE (mV) 50 1490A G06 1490A G05 Input Noise Current vs Frequency 0.35 INPUT NOISE CURRENT DENSITY (pA/√Hz) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) 4 5 6 TIME (SEC) 70 100m 80 3 80 Noise Voltage Density vs Frequency NOISE VOLTAGE (400nV/DIV) 0 VS = 5V, 0V 90 NO LOAD 0 1490A G04 0.1Hz to 10Hz Noise Voltage 44 100 TA = 125°C 1m 0.1µ 100m VS = ±2.5V 5.6 4.4 4.8 5.2 COMMON MODE VOLTAGE (V) Output Saturation Voltage vs Input Overdrive VS = 5V, 0V 100m 100m TA = 125°C 10 1490A G03 OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) VS = 5V, 0V 1µ 20 Output Saturation Voltage vs Load Current (Output Low) TA = 125°C TA = 25°C 1490A G02 Output Saturation Voltage vs Load Current (Output High) 10m 30 –10 4.0 5 1490A G01 1 TA = –55°C 0 TA = 125°C 0 1000 70 60 50 40 0.30 0.25 0.20 0.15 0.10 0.05 0 30 1 10 100 FREQUENCY (Hz) 1k 1490A G08 1 10 100 FREQUENCY (Hz) 1k 1490A G09 5 LT1490A U W TYPICAL PERFOR A CE CHARACTERISTICS Gain and Phase Shift vs Frequency Gain Bandwidth Product vs Temperature 40 30 20 20 0 GAIN 10 –20 0 – 40 –10 – 60 –20 – 80 10 100 FREQUENCY (kHz) 200 VS = ±15V 180 VS = ±1.5V 160 50 25 0 75 TEMPERATURE (°C) 40 200 30 180 170 20 RL = 10k f = 1kHz 160 COMMON MODE REJECTION RATIO (dB) 220 PHASE MARGIN (DEG) GAIN BANDWIDTH PRODUCT (kHz) 50 GAIN BANDWIDTH 0 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 100 VS = ±15V 80 VS = ±1.5V 60 40 10 FREQUENCY (kHz) PHASE MARGIN 250 40 30 20 NEGATIVE SUPPLY 10 0 –10 10 FREQUENCY (kHz) 1 100 1490A G15 Output Impedance vs Frequency 10k VS = ±15V VS = ± 2.5V 120 70 60 200 POSITIVE SUPPLY 50 100 50 GAIN BANDWIDTH 150 40 100 30 110 OUTPUT IMPEDANCE (Ω) 300 130 CHANNEL SEPARATION (dB) VS = ± 2.5V AV = –1 RF = RG = 100k f = 1kHz 60 Channel Separation vs Frequency 80 PHASE MARGIN (DEG) GAIN BANDWIDTH PRODUCT (kHz) 350 VS = ±2.5V 70 1490A G14 1490A G13 Gain Bandwidth Product and Phase Margin vs Load Resistance 125 –20 1 45 100 PSRR vs Frequency 80 20 10 150 50 25 0 75 TEMPERATURE (°C) 1490A G12 120 240 190 0.04 –50 –25 125 100 CMRR vs Frequency 210 FALLING, VS = ±1.5V 1490A G11 60 230 FALLING, VS = ±15V 120 Gain Bandwidth Product and Phase Margin vs Supply Voltage PHASE MARGIN RISING, VS = ±1.5V 0.08 0.06 140 1490A G10 250 RISING, VS = ±15V 0.10 220 100 –50 –25 –100 1000 –30 1 f = 1kHz PHASE SHIFT (DEG) GAIN (dB) 240 60 PHASE 40 80 POWER SUPPLY REJECTION RATIO (dB) 50 100 Slew Rate vs Temperature 0.12 SLEW RATE (V/µs) VS = ±2.5V GAIN BANDWIDTH PRODUCT (kHz) 70 60 260 100 90 80 70 60 1k AV = 100 100 AV = 10 10 1 AV = 1 50 50 1 10 LOAD RESISTANCE (kΩ) 20 100 1490A G16 6 40 0.1 1 10 FREQUENCY (kHz) 100 1490A G17 0.1 0.1 1 10 FREQUENCY (kHz) 100 1490A G18 LT1490A U W TYPICAL PERFOR A CE CHARACTERISTICS Undistorted Output Swing vs Frequency 35 10 0 –2 –4 40 AV = 1 AV = 2 AV = 10 AV = 5 30 20 40 60 80 100 120 140 160 SETTLING TIME (µs) 10 100 1000 CAPACITIVE LOAD (pF) 10000 1490A G19 1490A F20 1490A G21 Total Harmonic Distortion + Noise vs Frequency Total Harmonic Distortion + Noise vs Load Resistance Total Harmonic Distortion + Noise vs Output Voltage 0.01 1 RL = 10k VCM = HALF SUPPLY f = 1kHz 1 VS = ±1.5V VIN = ±1V 0.1 VS = 3V, 0V VIN = 0.5V TO 2.5V AV = –1 VS = ±1.5V 0.1 AV = 1 VS = 3V, 0V VS = 3V, 0V VIN = 0.2V TO 2.2V AV = 1 1 0.1 FREQUENCY (kHz) 10 0.001 0.1 AV = –1 VS = 3V, 0V 0.001 10 1 LOAD RESISTANCE TO GROUND (kΩ) 1490A G22 Open-Loop Gain AV = 1 VS = ±1.5V 0.01 0.01 AV = –1 0.001 0.01 10 VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz THD + NOISE (%) 10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 50k 0.1 CHANGE IN INPUT OFFSET VOLTAGE (100µV/DIV) 50 0 0 100 60 10 AV = 1 –10 1 10 FREQUENCY (kHz) 70 20 AV = –1 –8 THD + NOISE (%) 1 2 –6 VS = 5V, 0V 0 0.1 10 80 AV = 1 4 VS = 5V, 0V ISOURCE = 170µA 90 OVERSHOOT (%) OUTPUT STEP (V) OUTPUT SWING (VP-P) 15 100 AV = –1 6 20 Capacitive Load Handling, Overshoot vs Capacitive Load VS = ±15V 8 25 5 THD + NOISE (%) 10 DISTORTION ≤1% VS = ±15V 30 Settling Time to 0.1% vs Output Step 100 0 1 2 OUTPUT VOLTAGE (VP-P) 1490A G24 1490A G23 Large-Signal Response 3 Small-Signal Response VS = ±15V RL = 2k RL = 10k RL = 50k –10V 0V 10V OUTPUT VOLTAGE (5V/DIV) 1490A G25 VS = ±15V AV = –1 1490A G26 VS = ±15V AV = 1 1490A G27 7 LT1490A U W U U APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1490A should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1490A is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is less than 1nA. The LT1490A can be shut down by removing V +. In this condition the input bias current is typically less than 0.5nA, even if the inputs are 44V above the negative supply. When operating the LT1490A on total supplies of 20V or more, the supply must not rise to its final voltage in less than 1µs. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. A resistance of 7.5Ω in the supply or in the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1490A has two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.8V or more below V +, the PNP input stage is active and the input bias current is typically – 1nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 25nA. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 600µV. A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the LT1490A to operate with either or both of its inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 3µA at room temperature. The input offset voltage is typically 700µV when operating above V +. The LT1490A will operate with its inputs 44V above V – regardless of V +. 8 The inputs are protected against excursions as much as 15V below V – by an internal 1k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 15V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the LT1490A is affected by input overdrive as shown in the typical performance curves. The output of the LT1490A can be pulled up to 18V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. The normally reverse-biased substrate diode from the output to V – will cause unlimited currents to flow when the output is forced below V –. If the current is transient and limited to 100mA, no damage will occur. The LT1490A is internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.22µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 10,000pF, at all output currents. Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1490A switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1490A should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.8V). See the Typical Performance Characteristics curves. LT1490A U W U U APPLICATIO S I FOR ATIO Gain in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. The open-loop gain is almost independent of load when the output is sourcing current. This optimizes performance U TYPICAL APPLICATIO S Square Wave Oscillator Optional Output Compensation for Capacitive Loads Greater Than 200pF 59k 5V 100k + 1/2 LT1490A 100k + VIN 1/2 LT1490A VOUT CL ≤ 10,000pF – – R 50k C 0.1µF 1490A TA02 0.22µF 150Ω f= 1 2RC VOUT = 5VP-P WITH 5V SUPPLY IS = 200µA 1490A TA04 AT VS = 5V, R = 50k, C = 1nF OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE W W SI PLIFIED SCHE ATIC V+ Q2 Q1 D1 R1 30k Q3 Q22 D3 D2 R2 1k Q4 Q19 – IN Q17 Q7 R3 1k + Q8 Q11 OUT Q16 +IN 2µA Q18 Q15 Q9 Q5 Q20 Q12 Q6 D4 D5 Q10 Q13 Q14 R4 40k Q21 R5 40k V– ONE AMPLIFIER 1490A SS 9 LT1490A U PACKAGE DESCRIPTIO 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 7 6 5 0.118 ± 0.004** (3.00 ± 0.102) 0.193 ± 0.006 (4.90 ± 0.15) 1 2 3 4 0.040 ± 0.006 (1.02 ± 0.15) 0.007 (0.18) 0.034 ± 0.004 (0.86 ± 0.102) 0° – 6° TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) BSC 0.021 ± 0.006 (0.53 ± 0.015) 0.006 ± 0.004 (0.15 ± 0.102) MSOP (MS8) 1098 * 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 N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.065 (1.651) TYP 0.100 (2.54) BSC *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 10 0.130 ± 0.005 (3.302 ± 0.127) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) N8 1098 LT1490A U PACKAGE DESCRIPTIO 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) 0.014 – 0.019 (0.355 – 0.483) 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 2 3 4 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 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. SO8 1298 11 LT1490A U TYPICAL APPLICATIO Ring-Tone Generator 60V R16 100k R2 47k R3 10k C2 0.47µF 3 + R1 1/2 LT1490A 33k 2 1 D1 1N4148 R5 100k 5 – 7 R9 300k R11 10k 10 Z1 15V 100k + 1/2 LT1490A R7 16k – C4 0.068µF 9 8 13 – R4 1.6M R8 620k CADENCE OSCILLATOR R10 620k R12 SMOOTHING FILTER 10k R14 10k R13 130k R15 47k 20Hz OSCILLATOR C5 0.01µF + R17 620Ω 4 – 1/2 LT1490A 12 C1 1µF Q3 2N3904 C3 0.047µF + 1/2 LT1490A 6 Q1 IRF628 R6 10k R24 11 420 14 C7 47µF R18 100Ω OPTO1* R25 4.7k Q5 2N3904 Z2 15V R19 620Ω UP TO LOAD TEN PHONES Q4 2N3906 Q2 IRF9620 *LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK R26 2k R23 4.7k R21 150Ω C6 0.033µF POWER AMPLIFIER –180V R20 100k 1490A TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1078/LT1079 LT2078/LT2079 Dual/Quad 55µA Max, Single Supply, Precision Op Amps Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate LT1178/LT1179 LT2178/LT2179 Dual/Quad 17µA Max, Single Supply, Precison Op Amps Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps 475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW LT1636 Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp 55µA Supply Current, VCM Extends 44V above VEE, Independent of VCC, MSOP Package, Shutdown Function LT1638/LT1639 Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps 0.4V/µs Slew Rate, 230µA Supply Current per Amplifier LT1782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp SOT-23, 800µV VOS(MAX), IS =55µA (Max), Gain-Bandwidth = 200kHz, Shutdown Pin LT1783 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp SOT-23, 800µV VOS(MAX), IS =300µA (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin 12 Linear Technology Corporation 1490af LT/TP 0300 4K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 2000