LT1797CS5-PBF

FEATURES n n n n n n n n n n n n n n LT1797 10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23 DESCRIPTION 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. 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. 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. The LT1797 op amp is available in the space saving 5-lead SOT-23 package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and Over-The-Top are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 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: 96dB Typ High PSRR: 90dB Typ Input Bias Current: 300nA Max Input Offset Current: 25nA Max Low Profile (1mm) SOT-23 (ThinSOT™) Package APPLICATIONS n n n n n Portable Instrumentation Rail-to-Rail Buffer Amplifiers Low Voltage Signal Processing Driving A/D Converters Battery-Powered Systems 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 Small-Signal Response BZX84C6V8 VZ = 6.8V –48V SUPPLY (–42V TO –56V) 0.003Ω 1% 3W – ISENSE + + 1797 TA01 – LT1797 0.1μF –48V LOAD R1 REDUCES Q1 DISSIPATION 1797 TA01b SETTLES TO 1% IN 2μs, 1V OUTPUT STEP VS = ±2.5V AV = 1 RL = 10k 1797fb 1 LT1797 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION TOP VIEW OUT 1 V– 2 +IN 3 +– 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 5 V+ 4 –IN S5 PACKAGE 5-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 250°C/W ORDER INFORMATION LEAD FREE FINISH LT1797CS5#PBF LT1797IS5#PBF TAPE AND REEL LT1797CS5#TRPBF LT1797IS5#TRPBF PART MARKING LTLM LTTL PACKAGE DESCRIPTION 5-Lead Plastic TSOT-23 5-Lead Plastic TSOT-23 TEMPERATURE RANGE –40°C to 85°C –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, pulse power tested, unless otherwise specified. (Note 3) SYMBOL VOS PARAMETER Input Offset Voltage 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 4) IB Input Bias Current Input Bias Current Drift IOS Input Offset Current Input Noise Voltage en in RIN CIN CMRR Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Common Mode Rejection Ratio VCM = 0V to VS – 1.3V VS = 5V, VCM = 0V to 5V VS = 3V, VCM = 0V to 3V l l l ELECTRICAL CHARACTERISTICS CONDITIONS l l l l l l l l MIN TYP 1 MAX 1.5 2.5 3.0 20 100 25 25 UNITS mV mV mV μV/°C nA nA nA/°C nA nA μVP-P nV/√Hz pA/√Hz pA/√Hz kΩ MΩ pF dB dB dB 1797fb 5 –300 –150 50 0.1 10 10 1.5 20 0.23 0.15 200 330 100 4 82 64 60 96 72 68 VCM = V– VCM = V+ VCM = V– VCM = V+ 0.1Hz to 10Hz f = 10kHz f = 10kHz f = 10kHz, VCM = VCC – 0.3V Differential Common Mode, VCM = 0V to VS – 1.3V 2 LT1797 ELECTRICAL CHARACTERISTICS SYMBOL AVOL PARAMETER Input Voltage Range Large-Signal Voltage Gain VS = 3V, VO = 0.5V to 2.5V, RL = 10k VS = 5V, VO = 0.5V to 4.5V, RL = 10k PSRR VOL Power Supply Rejection Ratio Minimum Supply Voltage Output Voltage Swing LOW No Load, Input Overdrive = 30mV ISINK = 5mA ISINK = 10mA No Load, Input Overdrive = 30mV ISOURCE = 5mA ISOURCE = 10mA, VS = 5V ISOURCE = 10mA, VS = 3V VS = 5V VS = 3V l The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, pulse power tested, unless otherwise specified. (Note 3) CONDITIONS l l l l l l l l l l l l MIN 0 200 150 400 300 80 TYP 1000 1000 90 2.5 8 80 150 MAX VS UNITS V V/mV V/mV V/mV V/mV dB VS = 2.7V to 12V, VCM = VO = 1V 2.7 30 160 250 V mV mV mV V V V V mA mA VOH Output Voltage Swing HIGH VS – 0.14 VS – 0.05 VS – 0.30 VS – 0.2 VS – 0.39 VS – 0.3 VS – 0.59 VS – 0.3 25 15 45 25 1.1 6.0 5.0 4.5 1.3 1.1 1.0 10 1.5 2.0 ISC IS GBW Short-Circuit Current Supply Current Gain Bandwidth Product (Note 5) mA mA MHz MHz MHz V/μs V/μs V/μs ns ns μs % kHz f = 100kHz 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C AV = –1 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C 10% to 90%, 0.1V Step, RL = 10k 10% to 90%, 0.1V Step, RL = 10k VS = 5V, ΔVOUT = 2V to 0.1%, AV = –1 VS = 3V, VOUT = 1.8VP-P, AV = 1, RL = 10k, f = 1kHz VOUT = 2VP-P l l l l SR Slew Rate (Note 5) 2.25 tr tf tS THD FPBW Output Rise Time Output Fall Time Settling Time Distortion Full-Power Bandwidth (Note 6) 55 55 1.6 0.001 360 The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, pulse power tested unless otherwise specified. (Note 3) SYMBOL VOS PARAMETER Input Offset Voltage 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 4) IB Input Bias Current Input Bias Current Drift IOS Input Offset Current Input Noise Voltage en in Input Noise Voltage Density Input Noise Current Density VCM = V– VCM = V+ 0.1Hz to 10Hz f = 10kHz f = 10kHz f = 10kHz, VCM = 4.7V VCM = V– VCM = V+ CONDITIONS l l l l l l l l MIN TYP 1 MAX 1.5 2.5 3.0 20 100 25 25 UNITS mV mV mV μV/°C nA nA nA/°C nA nA μVP-P nV/√Hz pA/√Hz pA/√Hz 1797fb 5 –300 –150 50 0.1 10 10 1 20 0.23 0.15 3 LT1797 ELECTRICAL CHARACTERISTICS SYMBOL RIN CIN CMRR AVOL VOL PARAMETER Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing LOW VCM = –5V to 3.7V VCM = –5V to 5V VO = ±4V, RL = 10k No Load, Input Overdrive = 30mV ISINK = 5mA ISINK = 10mA No Load, Input Overdrive = 30mV ISOURCE = 5mA ISOURCE = 10mA Short to GND VS = ±1.35V to ±6V l l l l l l l l l l l l The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.VS = ±5V, VCM = 0V, VOUT = 0V, pulse power tested unless otherwise specified. (Note 3) CONDITIONS Differential Common Mode, VCM = –5V to 3.7V MIN 200 TYP 330 100 4 –5 78 66 400 300 96 76 1000 –4.99 –4.92 –4.85 4.84 4.70 4.61 30 80 4.95 4.80 4.70 50 90 1.40 6.5 5.5 5.0 1.50 1.25 1.10 11 2.25 3.00 –4.97 –4.87 –4.79 5 MAX UNITS kΩ MΩ pF V dB dB V/mV V/mV V V V V V V mA dB mA mA MHz MHz MHz V/μs V/μs V/μs ns ns μs kHz VOH Output Voltage Swing HIGH ISC PSRR IS GBW Short-Circuit Current (Note 2) Power Supply Rejection Ratio Supply Current Gain Bandwidth Product f = 100kHz 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C 10% to 90%, 0.1V Step, RL = 10k 10% to 90%, 0.1V Step, RL = 10k ΔVOUT = 4V to 0.1%, AV = 1 VOUT = 8VP-P l l l l SR Slew Rate 2.50 tr tf tS FPBW Output Rise Time Output Fall Time Settling Time Full-Power Bandwidth (Note 6) 55 55 2.6 100 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. 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. 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 1797fb 4 LT1797 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1.8 1.6 SUPPLY CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 1797 G01 Minimum Supply Voltage 300 100 50 INPUT BIAS CURRENT (nA) 0 –50 –100 –150 –200 INPUT OFFSET VOLTAGE CHANGE (μV) 200 100 0 –100 –200 –300 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) 1797 G02 Input Bias Current vs Common Mode Voltage VS = 5V, 0V TA = 125°C TA = –55°C TA = 25°C TA = 125°C TA = 25°C TA = –55°C TA = 125°C TA = 25°C TA = –55°C 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 G03 Output Saturation Voltage vs Load Current (Output High) 1 OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) VS = ±2.5V VOD = 30mV 1 Output Saturation Voltage vs Load Current (Output Low) OUTPUT SATURATION VOLTAGE (mV) VS = ±2.5V VOD = 30mV 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Output Saturation Voltage vs Input Overdrive VS = ±2.5V IOUT = 0 0.1 0.1 TA = 25°C TA = 125°C TA = –55°C 0.01 TA = 125°C TA = 25°C TA = –55°C OUTPUT HIGH OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV) 1797 G06 0.01 1μ 10μ 100μ 1m SOURCING LOAD CURRENT (A) 10m 1797 G04 0.001 1μ 10μ 100μ 1m SINKING LOAD CURRENT (A) 10m 1797 G05 Output Short-Circuit Current vs Temperature 50 45 OUTPUT CURRENT (mA) 40 SINKING CURRENT 35 30 25 20 –50 –25 VS = ±2.5V SOURCING CURRENT NOISE VOLTAGE (1μV/DIV) 0.1Hz to 10Hz Noise Voltage INPUT NOISE VOLTAGE DENSITY (nV/√Hz) VS = ±5V 100 Input Noise Voltage Density vs Frequency VS = ±2.5V 80 60 40 20 0 50 25 75 0 TEMPERATURE (°C) 100 125 0 1 2 3 456 TIME (SEC) 7 8 9 10 10 100 1k 10k FREQUENCY (Hz) 100k 1797 G09 1797 G07 1797 G08 1797fb 5 LT1797 TYPICAL PERFORMANCE CHARACTERISTICS Input Noise Current Density vs Frequency 1.2 INPUT NOISE CURRENT DENSITY (pA/√Hz) 1.0 0.8 GAIN (dB) 0.6 0.4 0.2 0 10 VS = ±2.5V 70 60 50 40 30 20 10 0 –10 –20 100 1k 10k FREQUENCY (Hz) 100k 1797 G10 Gain and Phase Shift vs Frequency VS = ±2.5V 100 GAIN BANDWIDTH PRODUCT (MHz) 80 60 40 PHASE (DEG) 20 GAIN 0 –20 –40 –60 –80 100k 1M 10M FREQUENCY (Hz) –100 100M 1797 G11 Gain Bandwidth Product vs Temperature 12.0 11.5 11.0 10.5 10.0 VS = ±2.5V 9.5 9.0 8.5 8.0 –50 –25 0 75 50 25 TEMPERATURE (°C) 100 125 VS = ±5V f = 100kHz PHASE –30 10k 1797 G12 Slew Rate vs Temperature 3.5 VS = ±2.5V GAIN BANDWIDTH PRODUCT (MHz) Gain Bandwidth Product and Phase Margin vs Supply Voltage GAIN BANDWIDTH PRODUCT (MHz) f = 100kHz RF = RG = 1k PHASE MARGIN 60 55 50 45 40 35 30 13 12 11 10 9 8 GAIN BANDWIDTH PRODUCT Gain Bandwidth Product and Phase Margin vs RF and RG VS = ±5V 60 50 PHASE MARGIN 40 PHASE MARGIN (DEG) 30 20 10 14 13 12 11 10 1k 10k RF = RG = (Ω) 100k 1797 G15 3.0 RISING SLEW RATE (V/μs) 2.5 FALLING 2.0 PHASE MARGIN (DEG) 1.5 GAIN BANDWIDTH PRODUCT 1.0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 1797 G14 1797 G13 PSRR vs Frequency 90 POWER SUPPLY REJECTION RATIO (dB) 80 70 60 50 40 30 20 10 0 –10 1k 10k 100k 1M FREQUENCY (Hz) 10M 1797 G16 CMRR vs Frequency COMMON MODE REJECTION RATIO (dB) VS = ±2.5V 110 100 90 80 70 60 50 40 30 20 10 1k 10k 100k 1M FREQUENCY (Hz) 10M 1797 G17 Output Impedance vs Frequency VS = ±2.5V 100 VS = ±2.5V GAIN = 100 OUTPUT IMPEDANCE (Ω) 10 NEGATIVE SUPPLY POSITIVE SUPPLY 1 GAIN = 10 0.1 0.01 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 1797 G18 1797fb 6 LT1797 TYPICAL PERFORMANCE CHARACTERISTICS Open-Loop Gain CHANGE IN INPUT OFFSET VOLTAGE (50μV/DIV) VS = ±5V 4 3 AV = 1 2 OUTPUT STEP (V) 1 0 –1 –2 –3 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) AV = 1 AV = –1 OVERSHOOT (%) AV = –1 Settling Time to 0.1% vs Output Step VS = ±5V 50 45 40 35 30 25 20 15 10 5 0 Capacitive Load Handling Overshoot vs Capacitive Load VS = ±2.5V RL = 50k RL = 10k RL = 2k AV = 1 AV = 2 AV = 5 AV = 10 10 100 1000 CAPACITIVE LOAD (pF) 10000 1797 G21 4 5 1797 G19 –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) 1797 G20 Undistorted Output Swing vs Frequency 12 11 10 OUTPUT SWING (VP-P) 9 8 7 6 5 4 3 2 1 0 100 1k 10k 100k FREQUENCY (Hz) 1M 1797 G22 Total Harmonic Distortion + Noise vs Frequency 1 RL = 10k VS = 3V, 0V VOUT = 1.8VP-P VCM = 1V THD + NOISE (%) 10 Total Harmonic Distortion + Noise vs Load Resistance VS = 3V TOTAL AV = 1 f = 1kHz AV = 1 VS = ±5V 0.1 THD + NOISE (%) 1 0.01 AV = –1 0.1 VS = 3V, 0V VIN = 1.8VP-P VCM = 1.5V VS = 3V, 0V VIN = 1.8VP-P VCM = 1V 0.1 1 10 LOAD RESISTANCE TO GROUND (kΩ) 100 VS = ±1.5V 0.001 AV = 1 0.01 0.0001 10 100 1k 10k FREQUENCY (Hz) 100k 1797 G23 0.001 1797 G24 Total Harmonic Distortion + Noise vs Output Voltage Amplitude 10 f = 1kHz VCM = HALF SUPPLY RL = 10k AV = –1 VS = 3V, 0V 0.1 AV = 1 VS = ±1.5V Large-Signal Response Small-Signal Response 1 THD + NOISE (%) 0.01 AV = 1 VS = 3V, 0V 0 AV = –1 VS = ±1.5V 3 1797 G25 1797 G26 1797 G27 0.001 VS = ±2.5V AV = 1 2 1 OUTPUT VOLTAGE (VP-P) VS = ±2.5V AV = 1 RL = 10k 1797fb 7 LT1797 APPLICATIONS INFORMATION 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 1.3V 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. 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. 1797fb 8 LT1797 APPLICATIONS INFORMATION 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 1.3V of V+), the CMRR is very good, typically 96dB. 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+ – 1.3V). See the Typical Performance Characteristic curves. I1 Q18 Q17 R1 R2 1/2 SUPPLY Q15 Q16 Q19 BIAS QB1 Q13 R5 Q14 I7 C2 –IN D1 R6 +IN D2 Q1 Q2 Q9 Q10 I2 I3 R7 +1 R8 +1 CM OUT Q3 Q4 I4 Q7 Q8 Q11 Q12 C1 I5 Q5 Q6 R3 R4 I6 Q20 1797 F01 Figure 1. Simplified Schematic 1797fb 9 LT1797 TYPICAL APPLICATIONS Single Supply Hi-Gain 80kHz Photodiode Amplifier 3V R2 1k R3 10k C1 0.1μF R1 100k 3V *CP = SUM OF PHOTODIODE CAPACITANCE, PARASITIC LAYOUT CAPACITANCE AND LT1797 INPUT CAPACITANCE 10pF. R6 330Ω C3 1000pF TRANSIMPEDANCE GAIN: AZ = 10MΩ. R6, C3 LIMIT THE NOISE BANDWIDTH TO 500kHz. 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 + PHOTODIODE SFH213FA CP* LT1797 – 1797fb 10 LT1797 TYPICAL APPLICATIONS Ultralow Noise, ±5V Supply, Rail-to-Rail Output Amplifier 5V IN + LT1028 5V + R5 1k R2 4.99k LT1797 OUT TOTAL INPUT VOLTAGE NOISE (INCLUDING 10Ω RESISTOR) BANDWIDTH AV = 500 40kHz 0.94nV/√Hz – –5V – –5V C1 2200pF R1 10k R3 4.99k R4 10Ω 1797 TA03 1797fb 11 LT1797 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC DATUM ‘A’ 1.00 MAX 0.01 – 0.10 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 0.30 – 0.50 REF 1.90 BSC S5 TSOT-23 0302 REV B 1797fb 12 LT1797 REVISION HISTORY REV B DATE 6/10 DESCRIPTION Updated the last Feature. Updated the package description in the Pin Configuration section. Updated VOH in the Electrical Characteristics section. Replaced the package drawing in the Package Description section. (Revision history begins at Rev B) PAGE NUMBER 1 2 3 12 1797fb 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. 13 LT1797 TYPICAL APPLICATION 1MHz Photodiode Transimpedance Amplifier 3pF Response of Photodiode Amplifier 100k V+ PHOTODIODE SFH213FA SIEMENS/INFINEON 100mV/DIV – LT1797 + V– VS = ±1.5V TO ±5V 1797 TA04 2μs/DIV 1797 TA04b Rise Time vs Supply Voltage (600mV Output Step) Supply Voltage ±1.5V ±2.5V ±5V 10% to 90% Rise Time 830ns 800ns 700ns RELATED PARTS PART NUMBER LT1630/LT1631 LT1638/LT1639 LT1783 LT1880 DESCRIPTION Dual/Quad 30MHz, 10V/μs Rail-to-Rail Input and Output Op Amps Dual/Quad 1.2MHz, 0.4V/μs, Over-The-Top™ Micropower Rail-to-Rail Input and Output Op Amps Micropower Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp SOT-23 Rail-to-Rail Output, Picoamp Input Current Precision Op Amp COMMENTS High DC Accuracy, 525μV VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amp 170μA Supply Current, Single Supply Input Range –0.4V to 44V, Rail-to-Rail Input and Output SOT-23 Package, Micropower 220μA per Amplifier, Rail-to-Rail Input and Output, 1.2MHz Gain Bandwidth 150μV Maximum Offset Voltage, 900pA Maximum Bias Current, 1.1MHz Gain Bandwidth, –40°C to 85°C Temperature Range 1797fb 14 Linear Technology Corporation (408) 432-1900 ● FAX: (408) 434-0507 ● LT 0610 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 www.linear.com © LINEAR TECHNOLOGY CORPORATION 2000