LT1797 10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23 U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LT®1797 is a unity-gain stable 10MHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.7V to 12V. The amplifier draws 1mA of quiescent current and has a slew rate of 2.25V/µs. Rail-to-Rail Input and Output Small SOT-23 Package Gain Bandwidth Product: 10MHz –40°C to 85°C Operation Slew Rate: 2.25V/µs Low Input Offset Voltage: 1.5mV Max High Output Current: 25mA Min Specified on 3V, 5V and ±5V Supplies High Voltage Gain: 1000V/mV 10k Load High CMRR: 88dB Min High PSRR: 80dB Min Input Bias Current: 300nA Max Input Offset Current: 25nA Max The input common mode range of the LT1797 includes both rails, making it ideal for current sensing applications. The input stage incorporates phase reversal protection to prevent false outputs from occurring when the inputs are driven beyond the supplies. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced above or below the supplies. U APPLICATIO S ■ ■ ■ ■ ■ The output of the LT1797 can swing to within 50mV of V + and 8mV of V – without drawing excess current in either condition. The amplifier can drive loads up to 25mA and still maintain rail-to-rail capability. Portable Instrumentation Rail-to-Rail Buffer Amplifiers Low Voltage Signal Processing Driving A/D Converters Battery-Powered Systems The LT1797 op amp is available in the space saving 5-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATION Fast Compact – 48V Current Sense VOUT = 3V – 0.1Ω • ISENSE ISENSE = 0A TO 30A ACCURACY ≈ 3% VOUT Q1 FMMT493 30.1Ω 1% – 3.3k 0805 ×3 + R1 4.7k 1k 1% VS = 3V R1 REDUCES Q1 DISSIPATION LT1797 0.1µF SETTLES TO 1% IN 2µs, 1V OUTPUT STEP BZX84C6V8 VZ = 6.8V –48V SUPPLY (–42V TO –56V) 0.003Ω 1% 3W – ISENSE + 1797 TA01 –48V LOAD 1 LT1797 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) Total Supply Voltage (V + to V –) ........................... 12.6V Input Differential Voltage ..................................... 12.6V Input Current ..................................................... ±10mA Output Short-Circuit Duration (Note 2) ........ Continuous Operating Temperature Range (Note 3) ............................................. – 40°C to 85°C Specified Temperature Range ................. – 40°C to 85°C Junction Temperature........................................... 150°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER TOP VIEW V– 2 LT1797CS5 LT1797IS5 5 V+ OUT 1 + – +IN 3 4 –IN S5 PART MARKING S5 PACKAGE 5-LEAD PLASTIC SOT-23 LTLM LTTL TJMAX = 150°C, θJA = 250°C/ W Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, pulse power tested, unless otherwise specified. (Note 3) SYMBOL PARAMETER VOS CONDITIONS 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 4) IB Input Bias Current Input Offset Current VCM = V – VCM = V + TYP MAX 1 1.5 2.5 3.0 mV mV mV 5 20 µV/°C –150 50 100 nA nA ● ● ● VCM = V – VCM = V + Input Bias Current Drift IOS MIN Input Offset Voltage ● ● –300 ● 0.1 ● ● 10 10 UNITS nA/°C 25 25 nA nA Input Noise Voltage 0.1Hz to 10Hz 1.5 µVP-P en Input Noise Voltage Density f = 10kHz 20 nV/√Hz in Input Noise Current Density f = 10kHz f = 10kHz, VCM = VCC – 0.3V 0.23 0.15 pA /√Hz pA /√Hz RIN Input Resistance Differential Common Mode, VCM = 0V to VS – 1.2V 200 330 100 kΩ MΩ CIN Input Capacitance 4 pF CMRR Common Mode Rejection Ratio ● ● 88 64 96 72 dB dB ● 0 200 150 1000 ● V/mV V/mV 400 300 1000 ● V/mV V/mV VCM = 0V to VS – 1.2V VCM = 0V to VS Input Voltage Range AVOL Large-Signal Voltage Gain VS = 3V, VO = 0.5V to 2.5V, RL = 10k VS = 5V, VO = 0.5V to 4.5V, RL = 10k 2 VS V LT1797 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, pulse power tested, unless otherwise specified. (Note 3) SYMBOL PARAMETER CONDITIONS PSRR VS = 2.7V to 12V, VCM = VO= 1V Power Supply Rejection Ratio Minimum Supply Voltage ● MIN TYP 80 90 MAX UNITS dB ● 2.5 2.7 V VOL Output Voltage Swing LOW No Load, Input Overdrive = 30mV ISINK = 5mA ISINK = 10mA ● ● ● 8 80 150 15 160 250 mV mV mV VOH Output Voltage Swing HIGH No Load, Input Overdrive = 30mV ISOURCE = 5mA ISOURCE = 10mA ● VS – 0.14 VS – 0.05 ● VS – 0.30 VS – 0.2 ● VS – 0.39 VS – 0.3 ISC Short-Circuit Current VS = 5V VS = 3V IS Supply Current 25 15 45 25 1.1 ● GBW SR Gain Bandwidth Product (Note 5) Slew Rate (Note 5) V V V mA mA 1.5 2.0 mA mA f = 100kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 6.0 5.0 4.5 10 ● ● MHz MHz MHz AV = –1 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 1.3 1.1 1.0 2.25 ● ● V/µs V/µs V/µs tr Output Rise Time 10% to 90%, 0.1V Step, RL = 10k 55 ns tf Output Fall Time tS Settling Time 10% to 90%, 0.1V Step, RL = 10k 55 ns VS = 5V, ∆VOUT = 2V to 0.1%, AV = –1 1.6 µs THD Distortion VS = 3V, VOUT = 1.8VP-P, AV = 1, RL = 10k, f = 1kHz 0.001 % FPBW Full-Power Bandwidth (Note 6) VOUT = 2VP-P 360 kHz The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, pulse power tested unless otherwise specified. (Note 3) SYMBOL PARAMETER VOS CONDITIONS Input Offset Voltage 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 4) IB Input Bias Current VCM VCM = V + = V– TYP MAX UNITS 1 1.5 2.5 3.0 mV mV mV 5 20 µV/°C –150 50 100 nA nA ● ● ● = V– Input Bias Current Drift IOS MIN ● ● –300 ● 0.1 ● ● 10 10 nA/°C Input Offset Current VCM VCM = V + Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P en Input Noise Voltage Density f = 10kHz 20 nV/√Hz in Input Noise Current Density f = 10kHz f = 10kHz, VCM = 4.7V 0.23 0.15 pA/√Hz pA/√Hz RIN Input Resistance Differential Common Mode, VCM = – 5V to 3.8V 330 100 kΩ MΩ CIN Input Capacitance 4 pF Input Voltage Range 200 ● –5 25 25 5 nA nA V 3 LT1797 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = ±5V, VCM = 0V,VOUT = 0V, pulse power tested unless otherwise specified. (Note 3) SYMBOL PARAMETER CONDITIONS CMRR Common Mode Rejection Ratio VCM = – 5V to 3.8V VCM = – 5V to 5V AVOL Large-Signal Voltage Gain VO = ±4V, RL = 10k MIN TYP ● ● 83 66 96 76 400 300 1000 ● – 4.99 – 4.92 – 4.85 MAX UNITS dB dB V/mV V/mV VOL Output Voltage Swing LOW No Load, Input Overdrive = 30mV ISINK = 5mA ISINK = 10mA ● ● ● VOH Output Voltage Swing HIGH No Load, Input Overdrive = 30mV ISOURCE = 5mA ISOURCE = 10mA ● ● ● 4.84 4.70 4.61 ISC Short-Circuit Current (Note 2) Short to GND 30 50 mA PSRR Power Supply Rejection Ratio VS = ±1.35V to ±6V ● 80 90 dB IS Supply Current 4.95 4.80 4.70 1.40 ● GBW SR Gain Bandwidth Product Slew Rate V V V V V V 2.25 2.70 mA mA f = 100kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 6.5 5.5 5.0 11 ● ● MHz MHz MHz AV = – 1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 1.50 1.25 1.10 2.50 ● ● V/µs V/µs V/µs tr Output Rise Time 10% to 90%, 0.1V Step, RL = 10k tf Output Fall Time tS Settling Time FPBW Full-Power Bandwidth (Note 6) 55 ns 10% to 90%, 0.1V Step, RL = 10k 55 ns ∆VOUT = 4V to 0.1%, AV = 1 2.6 µs VOUT = 8VP-P 100 kHz Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. Note 3: The LT1797C is guaranteed to meet 0°C to 70°C specifications and is designed, characterized and expected to meet the extended temperature limits, but is not tested at –40°C and 85°C. The LT1797I is guaranteed to meet specified performance from – 40°C to 85°C. 4 – 4.98 – 4.87 – 4.79 Note 4: This parameter is not 100% tested. Note 5: VS = 3V limit guaranteed by correlation to 5V tests. Note 6: Full-power bandwidth is calculated from the slew rate: FPBW = SR/2πVP LT1797 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 1.2 TA = 25°C 1.0 TA = –55°C 0.8 0.6 0.4 0.2 0 100 200 50 INPUT BIAS CURRENT (nA) 1.4 300 100 0 TA = 125°C TA = 25°C –100 TA = –55°C –200 OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) 1 TA = 25°C TA = 125°C TA = –55°C 10µ 100µ 1m SOURCING LOAD CURRENT (A) 10m 0.1 TA = 125°C 0.01 TA = –55°C TA = 25°C 0.001 1µ 100µ 1m 10µ SINKING LOAD CURRENT (A) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) SOURCING CURRENT SINKING CURRENT 35 30 OUTPUT HIGH OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV) 1797 G06 100 VS = ±5V 40 VS = ±2.5V IOUT = 0 Input Noise Voltage Density vs Frequency NOISE VOLTAGE (1µV/DIV) OUTPUT CURRENT (mA) 10m 0.1Hz to 10Hz Noise Voltage VS = ±2.5V 25 20 –50 –25 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 1797 G05 Output Short-Circuit Current vs Temperature 45 Output Saturation Voltage vs Input Overdrive VS = ±2.5V VOD = 30mV 1797 G04 50 1797 G03 Output Saturation Voltage vs Load Current (Output Low) VS = ±2.5V VOD = 30mV 0.01 1µ 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 COMMON MODE VOLTAGE (V) 1797 G02 Output Saturation Voltage vs Load Current (Output High) 0.1 –100 –200 1797 G01 1 –50 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TOTAL SUPPLY VOLTAGE (V) 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) TA = –55°C TA = 25°C TA = 125°C –150 –300 1 0 VS = 5V, 0V 0 OUTPUT SATURATION VOLTAGE (mV) SUPPLY CURRENT (mA) TA = 125°C INPUT OFFSET VOLTAGE CHANGE (µV) 1.8 1.6 Input Bias Current vs Common Mode Voltage Minimum Supply Voltage VS = ±2.5V 80 60 40 20 0 50 25 75 0 TEMPERATURE (°C) 100 125 1797 G07 0 1 2 3 4 5 6 TIME (SEC) 7 8 9 10 1797 G08 10 100 1k 10k FREQUENCY (Hz) 100k 1797 G09 5 LT1797 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain and Phase Shift vs Frequency 70 VS = ±2.5V 1.0 60 PHASE 40 GAIN (dB) 0.6 0.2 100 1k 10k FREQUENCY (Hz) 20 GAIN 20 –20 0 –40 –10 –60 –20 –80 –30 10k 100k 0 10 100k –100 100M 1M 10M FREQUENCY (Hz) SLEW RATE (V/µs) 2.0 1.5 1.0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 60 f = 100kHz RF = RG = 1k 40 35 30 13 12 GAIN BANDWIDTH PRODUCT 11 10 NEGATIVE SUPPLY POSITIVE SUPPLY 30 20 10 0 –10 2 10k 100k 1M FREQUENCY (Hz) 10M 1797 G16 6 14 13 GAIN BANDWIDTH PRODUCT 12 1k 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 10k RF = RG = (Ω) Output Impedance vs Frequency 100 VS = ±2.5V 100 100k 1797 G15 1797 G14 110 40 10 11 1 60 20 10 0 125 30 9 90 80 70 60 50 40 30 VS = ±2.5V GAIN = 100 10 1 GAIN = 10 0.1 20 10 1k 100 PHASE MARGIN OUTPUT IMPEDANCE (Ω) 60 75 50 25 TEMPERATURE (°C) 0 50 8 COMMON MODE REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO (dB) 70 40 8.5 CMRR vs Frequency VS = ±2.5V 50 50 45 PHASE MARGIN PSRR vs Frequency 80 9.0 VS = ±5V 55 1797 G13 90 VS = ±2.5V 9.5 PHASE MARGIN (DEG) FALLING 10.0 Gain Bandwidth Product and Phase Margin vs RF and RG PHASE MARGIN (DEG) GAIN BANDWIDTH PRODUCT (MHz) VS = ±2.5V 2.5 VS = ±5V 10.5 1797 G12 Gain Bandwidth Product and Phase Margin vs Supply Voltage Slew Rate vs Temperature RISING 11.0 1797 G11 1797 G10 3.0 f = 100kHz 11.5 8.0 – 50 – 25 GAIN BANDWIDTH PRODUCT (MHz) 0 10 40 30 0.4 12.0 80 50 0.8 3.5 100 VS = ±2.5V 60 PHASE (DEG) INPUT NOISE CURRENT DENSITY (pA/√Hz) 1.2 Gain Bandwidth Product vs Temperature GAIN BANDWIDTH PRODUCT (MHz) Input Noise Current Density vs Frequency 1k 10k 100k 1M FREQUENCY (Hz) 10M 1797 G17 0.01 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 1797 G18 LT1797 U W TYPICAL PERFOR A CE CHARACTERISTICS Settling Time to 0.1% vs Output Step CHANGE IN INPUT OFFSET VOLTAGE (50µV/DIV) Open-Loop Gain 4 VS = ±5V 50 VS = ±5V 45 3 AV = 1 AV = –1 RL = 10k RL = 2k OVERSHOOT (%) OUTPUT STEP (V) RL = 50k 1 0 –1 –2 AV = 1 –3 12 1 AV = 1 11 VS = ±5V 10 9 0.1 THD + NOISE (%) 8 7 6 5 4 VS = ±1.5V 3 25 15 AV = 5 AV = 10 0 100 1000 CAPACITIVE LOAD (pF) 10 Total Harmonic Distortion + Noise vs Frequency Total Harmonic Distortion + Noise vs Load Resistance 10 RL = 10k VS = 3V, 0V VOUT = 1.8VP-P VCM = 1V 1 AV = –1 0.01 AV = 1 0.001 VS = 3V TOTAL AV = 1 f = 1kHz VS = 3V, 0V VIN = 1.8VP-P VCM = 1.5V 0.1 0.01 VS = 3V, 0V VIN = 1.8VP-P VCM = 1V 1 1k 10k 100k FREQUENCY (Hz) 1M 0.0001 10 100 1k 10k FREQUENCY (Hz) 1797 G22 Total Harmonic Distortion + Noise vs Output Voltage Amplitude 10 10000 1797 G21 2 0 100 AV = 2 AV = 1 20 1797 G20 1797 G19 Undistorted Output Swing vs Frequency 30 5 –4 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 SETTLING TIME (µs) 5 35 10 AV = –1 THD + NOISE (%) 4 VS = ±2.5V 40 2 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) OUTPUT SWING (VP-P) Capacitive Load Handling Overshoot vs Capacitive Load 100k 0.001 0.1 1 10 LOAD RESISTANCE TO GROUND (kΩ) 1797 G23 Large-Signal Response 100 1797 G24 Small-Signal Response f = 1kHz VCM = HALF SUPPLY RL = 10k THD + NOISE (%) 1 AV = –1 VS = 3V, 0V AV = 1 VS = ±1.5V 0.1 0.01 AV = 1 VS = 3V, 0V 0.001 0 VS = ±2.5V AV = 1 AV = –1 VS = ±1.5V 1 2 OUTPUT VOLTAGE (VP-P) 1797 G26 VS = ±2.5V AV = 1 RL = 10k 1797 G27 3 1797 G25 7 LT1797 U W U U APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1797 should be bypassed with a small capacitor (about 0.1µF) 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. Inputs The LT1797 is fully functional for an input signal range from the negative supply to the positive supply. Figure 1 shows a simplified schematic of the amplifier. The input stage consists of two differential amplifiers, a PNP stage Q3/Q4 and an NPN stage Q1/Q2 that are active over different ranges of input common mode voltage. The PNP differential pair is active for input common mode voltages VCM between the negative supply to approximately 1.2V below the positive supply. As VCM moves closer toward the positive supply, the transistor QB1 will steer the tail current I1 to the current mirror Q5/Q6, activating the NPN differential pair and the PNP pair becomes inactive for the rest of the input common mode range up to the positive supply. The input offset voltage and the input bias current are dependent on which input stage is active. The input offset voltage is trimmed on a single 5V supply with the common mode at 1/2 supply and is typically 1mV with the PNP stage active. The input offset of the NPN stage is untrimmed and is typically 1.5mV. The input bias current polarity depends on the input common mode voltage. When the PNP differential pair is active, the input bias currents flow out of the input pins. They flow in the opposite direction when the NPN input stage is active. The offset error due to the input bias currents can be minimized by equalizing the noninverting and inverting source impedance. 8 The input stage of the LT1797 incorporates phase reversal protection to prevent false outputs from occurring when the inputs are driven up to 5V beyond the rails. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced beyond the supplies or when a large differential signal is applied. Output The output is configured with a pair of complementary common emitter stages Q19/Q20, which enable the output to swing from rail-to-rail. The output voltage swing of the LT1797 is affected by input overdrive as shown in the Typical Performance Characteristics. When monitoring input voltages within 50mV of V + or within 8mV of V –, some gain should be taken to keep the output from clipping. The output of the LT1797 can deliver large load currents; the short-circuit current limit is typically 50mA at ±5V. Take care to keep the junction temperature of the IC below the absolute maximum rating of 150°C. The output of the amplifier has reverse biased diodes to each supply. If the output is forced beyond either supply, unlimited current will flow through these diodes. The LT1797 can drive capacitive loads up to 200pF on a single 5V supply in a unity gain configuration. When there is a need to drive larger capacitive loads, a resistor of a couple hundred ohms should be connected between the output and the capacitive load. The feedback should still be taken from the output so that the resistor isolates the capacitive load to ensure stability. The low input bias current of the LT1797 makes it possible to use high value feedback resistors to set the gain. However, care must be taken to insure that the pole formed by the feedback resistors and the total capacitance at the inverting input does not degrade stability. LT1797 U W U U APPLICATIO S I FOR ATIO Distortion There are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. If the op amp is operating in the inverting mode, there is no common mode induced distortion. If the op amp is operating in the PNP input stage (input is not within 1.2V of V+), the CMRR is very good, typically 95dB. When the LT1797 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 LT1797 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V+ – 1.2V). See the Typical Performance Characteristic curves. Q18 I1 R1 1/2 SUPPLY R2 Q17 Q15 Q16 Q19 QB1 BIAS C2 I7 Q13 Q14 R5 –IN Q1 Q2 Q9 Q10 D1 D2 I2 R6 I3 R7 +IN +1 R8 +1 CM OUT Q3 Q4 I4 I5 Q7 Q8 Q11 Q12 C1 Q5 Q6 Q20 R3 R4 I6 1797 F01 Figure 1. Simplified Schematic 9 LT1797 U TYPICAL APPLICATIO S Single Supply Hi-Gain 80kHz Photodiode Amplifier 3V R2 1k R3 10k C1 0.1µF *CP = SUM OF PHOTODIODE CAPACITANCE, PARASITIC LAYOUT CAPACITANCE AND LT1797 INPUT CAPACITANCE ≅10pF. 3V R1 100k + PHOTODIODE SFH213FA TRANSIMPEDANCE GAIN: AZ = 10MΩ. R6 330Ω R6, C3 LIMIT THE NOISE BANDWIDTH TO 500kHz. LT1797 CP* C3 1000pF – OUTPUT NOISE ≅1.8mVRMS. R1, CP AND LT1797 GBW SET UPPER LIMIT ON BANDWIDTH. R4, C2 SET LOWER 1.6kHz LIMIT ON GAIN OF 101. R5 R4 100k 1k C2 0.1µF 1797 TA02 Ultra-Low Noise, ±5V Supply, Rail-to-Rail Output Amplifier 5V IN 5V + + LT1028 – –5V R5 1k R2 4.99k LT1797 –5V C1 2200pF R4 10Ω OUT – R1 10k TOTAL INPUT VOLTAGE NOISE ≅ 0.94nV/√Hz (INCLUDING 10Ω RESISTOR) BANDWIDTH ≅ 40kHz AV = 500 R3 4.99k 1797 TA03 10 LT1797 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S5 Package 5-Lead Plastic SOT-23 (LTC DWG # 05-08-1633) 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) 2.60 – 3.00 (0.102 – 0.118) 1.50 – 1.75 (0.059 – 0.069) 0.35 – 0.55 (0.014 – 0.022) 1.90 (0.074) REF 0.00 – 0.15 (0.00 – 0.006) 0.09 – 0.20 (0.004 – 0.008) (NOTE 2) 0.95 (0.037) REF 0.90 – 1.45 (0.035 – 0.057) 0.35 – 0.50 0.90 – 1.30 (0.014 – 0.020) (0.035 – 0.051) FIVE PLACES (NOTE 2) S5 SOT-23 0599 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) 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. 11 LT1797 U TYPICAL APPLICATIO Response of Photodiode Amplifier 1MHz Photodiode Transimpedance Amplifier 3pF 100mV/DIV 100k V+ PHOTODIODE SFH213FA SIEMENS/INFINEON 2µs/DIV – LT1797 + VS = ±1.5V TO ±5V V– 1797 TA04 Rise Time vs Supply Voltage (600mV Output Step) Supply Voltage 10% to 90% Rise Time ±1.5V 830ns ±2.5V 800ns ±5V 700ns RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1630/LT1631 Dual/Quad 30MHz, 10V/µs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 525µV VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amp LT1638/LT1639 Dual/Ouad 1.2MHz, 0.4V/µs, Over-The-TopTM Micropower Rail-to-Rail Input and Output Op Amps 170µA Supply Current, Single Supply Input Range –0.4V to 44V, Rail-to-Rail Input and Output. LT1783 Micropower Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp SOT-23 Package, Micropower 220µA per Amplifier, Rail-to-Rail Input and Output, 1.2MHz Gain Bandwidth LT1880 SOT-23 Rail-to-Rail Output, Picoamp Input Current Precision Op Amp 150mV Maximum Offset Voltage, 900pA Maximum Bias Current, 1.1MHz Gain Bandwidth, –40°C to 85°C Temperature Range Over-The-Top is a trademark of Linear Technology Corporation. 12 Linear Technology Corporation 1797f LT/TP 0401 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