MIC918 Micrel MIC918 51MHz Low-Power SOT-23-5/SC-70 Op Amp Final Information General Description Features The MIC918 is a high-speed operational amplifier with a gain-bandwidth product of 51MHz. The part is unity gain stable. Ithas a very low 550A supply current, and features the IttyBitty ™ SOT-23-5 package and SC-70 package. Supply voltage range is from ±2.5V to ±9V, allowing the MIC918 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC918 is stable driving any capacitative load and achieves excellent PSRR and CMRR, making it much easier to use than most conventional high-speed devices. Low supply voltage, low power consumption, and small packing make the MIC918 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables. • 51MHz gain bandwidth product • 550µA supply current • SOT-23-5 or SC-70 packages • 1500V/µs slew rate • drives any capacitive load • Unity gain stable Applications • Video • Imaging • Ultrasound • Portable equipment • Line drivers Ordering Information Part Number Junction Temp. Range Package MIC918BM5 –40°C to +85°C SOT-23-5* MIC918BC5 –40°C to +85°C SC-70 * Contact factory about SOT-23-5 package. Pin Configuration Functional Pinout IN— V— IN+ 3 2 1 IN— V— IN+ Part Identification 3 2 1 A30 4 5 4 5 OUT V+ OUT V+ SOT-23-5 or SC-70 SOT-23-5 or SC-70 Pin Description Pin Number Pin Name Pin Function 1 IN+ Noninverting Input 2 V– Negative Supply (Input) 3 IN– Inverting Input 4 OUT Output: Amplifier Output 5 V+ Positive Supply (Input) Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com October 2001 1 MIC918 MIC918 Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VV+ – VV–) ........................................... 20V Differentail Input Voltage (VIN+ – VIN–) .......... 4V, Note 3 Input Common-Mode Range (VIN+, VIN–) .......... VV+ to VV– Lead Temperature (soldering, 5 sec.) ....................... 260°C Storage Temperature (TS) ........................................ 150°C ESD Rating, Note 4 ................................................... 1.5kV Supply Voltage (VS) ....................................... ±2.5V to ±9V Junction Temperature (TJ) ......................... –40°C to +85°C Package Thermal Resistance ............................................. SOT-23-5 .......................................................... 260°C/W SC-70-5 ............................................................. 450°C/W Electrical Characteristics (±5V) V+ = +5V, V– = –5V, VCM = 0V, RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted. Symbol Parameter Condition Min VOS Input Offset Voltage VOS VOS Temperature Coefficient IB Input Bias Current 0.26 0.6 µA IOS Input Offset Current 0.04 0.3 µA VCM Input Common-Mode Range CMRR > 72dB +3.25 V CMRR Common-Mode Rejection Ratio –2.5V < VCM < +2.5V 75 85 dB PSRR Power Supply Rejection Ratio ±3.5V < VS < ±9V 95 104 dB AVOL Large-Signal Voltage Gain RL = 2k, VOUT = ±2V 65 82 dB 85 dB 3.6 V Maximum Output Voltage Swing Max Units 0.43 5 mV µV/°C 1 –3.25 RL = 100Ω, VOUT = ±1V VOUT Typ positive, RL = 2kΩ +3.0 negative, RL = 2kΩ positive, RL = 200Ω –3.6 +1.5 negative, RL = 200Ω, Note 5 –3.0 3.0 –2.5 V V –1.0 V GBW Unity Gain-Bandwidth Product 45 MHz PM Phase Margin 54 ° BW –3dB Bandwidth 95 MHz SR Slew Rate C=1.7pF, Gain=1, VOUT=5V, peak to peak, positive SR = 450V/µs 850 V/µs ISC Short-Circuit Output Current source 45 63 mA sink 20 45 mA IS Supply Current No Load 0.55 0.80 mA Input Voltage Noise f = 10kHz 10 nV/√Hz Input Current Noise f = 10kHz 0.8 pA/√Hz Electrical Characteristics V+ = +9V, V– = –9V, VCM = 0V, RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter VOS Input Offset Voltage VOS Input Offset Voltage Temperature Coefficient IB Input Bias Current 0.23 0.60 µA IOS Input Offset Current 0.04 0.3 µA VCM Input Common-Mode Range CMRR > 75dB +7.25 V CMRR Common-Mode Rejection Ratio –6.5V < VCM < +6.5V 60 91 dB PSRR Power Supply Rejection Ratio ±3.5V < VS < ±9V 95 104 dB MIC918 Condition Min Typ Max Units 0.3 5 mV µV/°C 1 2 –7.25 October 2001 MIC918 Micrel Symbol Parameter Condition AVOL Large-Signal Voltage Gain RL = 2k, VOUT = ±2V Min Typ 75 84 dB 93 dB 7.5 V RL = 100Ω, VOUT = ±1V VOUT Maximum Output Voltage Swing positive, RL = 2kΩ 6.5 negative, RL = 2kΩ GBW Unity Gain-Bandwidth Product PM Phase Margin BW –3dB Bandwidth SR ISC IS –7.5 RL = 1kΩ Max –6.2 Units V 51 MHz 55 ° AV = 2, RL = 470Ω 109 MHz Slew Rate C=1.7pF, Gain=1, VOUT=5V, peak to peak, positive SR = 450V/µs 1500 V/µs Short-Circuit Output Current source 50 65 mA sink 30 50 mA Supply Current No Load 0.55 0.8 mA Input Voltage Noise f = 10kHz 10 nV/√Hz Input Current Noise f = 10kHz 0.8 pA/√Hz Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to change). Note 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Note 5. Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in “Typical Characteristics.” October 2001 3 MIC918 MIC918 Micrel Typical Characteristics Supply Current vs. Temperature 0.35 0.30 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) Offset Voltage vs. Common-Mode Voltage 1200 1000 800 600 400 200 150 900 1000 Negative Slew Rate vs. Supply Voltage 300 200 1000 100 NEGATIVE SLEW RATE (V/µs) POSITIVE SLEW RATE (V/µs) 400 800 900 700 800 Positive Slew Rate vs. Supply Voltage 500 600 700 LOAD CAPACITANCE (pF) 800 600 400 500 500 600 LOAD CAPACITANCE (pF) Negative Slew Rate vs. Load Capacitance 200 300 300 400 0 100 200 1000 800 900 600 700 400 500 200 300 0 700 700 600 500 400 300 200 100 0 7.40 300 250 0 0 100 V+ = ±5V 400 350 0 V+ = ±5V 4.44 5.92 -7.40 -5.92 3.40 500 450 V+ = ±9V LOAD CAPACITANCE (pF) SLEW RATE (V/µs) 2.04 2.72 Positive Slew Rate vs. Load Capacitance 100 50 0 +85°C Negative Slew Rate vs. Load Capacitance 200 800 +25°C COMMON-MODE VOLTAGE (V) 100 900 –40°C 0 1 2 3 4 5 6 7 8 SUPPLY VOLTAGE (±V) 900 1000 200 V± = ±9V 0 300 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 COMMON-MODE VOLTAGE (V) SLEW RATE (V/µs) SLEW RATE (V/µs) 400 0 100 SLEW RATE (V/µs) 500 0.68 1.36 +85°C 1400 600 OFFSET VOLTAGE (mV) –40°C +25°C 1600 V+ = ±9V 700 9 Offset Voltage vs. Common-Mode Voltage V± = ±5V Positive Slew Rate vs. Load Capacitance 800 3.8 5.1 6.4 7.7 SUPPLY VOLTAGE (V) 1.48 2.96 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -3.40 -2.72 OFFSET VOLTAGE (mV) OFFSET VOLTAGE (mV) Offset Voltage vs. Common-Mode Voltage 2.2 2 V± = ±2.5V 1.8 1.6 –40°C 1.4 1.2 +25°C 1 0.8 0.6 0.4 0.2 +85°C 0 -900 -540 -180 180 540 900 COMMON-MODE VOLTAGE (V) –40°C 700 800 0.9 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) +25°C 500 600 1 0.95 0.40 +85°C 300 400 V± = ±9V V± = ±2.5V 0.45 -0.68 0 1.05 0.50 0.62 0.60 0.58 0.56 0.54 0.52 0.50 0.48 0.46 0.44 0.42 0.40 2.5 100 200 V± = ±5V V± = ±5V 0.55 -2.04 -1.36 1.1 SUPPLY CURRENT (µA) SUPPLY CURRENT (mA) OFFSET VOLTAGE (mV) V± = ±2.5V 1.2 1.15 V± = ±9V -1.48 0 0.60 1.25 Supply Current vs. Supply Voltage -4.44 -2.96 Offset Voltage vs. Temperature 9 1800 1600 1400 1200 1000 800 600 400 200 0 0 1 2 3 4 5 6 7 8 SUPPLY VOLTAGE (±V) 9 LOAD CAPACITANCE (pF) MIC918 4 October 2001 MIC918 Micrel Voltage Noise Current Noise 6 80 CURRENT NOISE (pA/√Hz) NOISE VOLTAGE (nV/√Hz) 90 70 60 50 40 30 20 10 0 10 October 2001 100 1000 10000 100000 FREQUENCY (Hz) 5 4 3 2 1 0 10 100 1000 10000 100000 FREQUENCY (Hz) 5 MIC918 MIC918 Micrel It is important to ensure adequate supply bypassing capacitors are located close to the device. Power Supply Bypassing Regular supply bypassing techniques are recommended. A 10µF capacitor in parallel with a 0.1µF capacitor on both the positive and negative supplies are ideal. For best performance all bypassing capacitors should be located as close to the op amp as possible and all capacitors should be low ESL (equivalent series inductance), ESR (equivalent series resistance). Surface-mount ceramic capacitors are ideal. Thermal Considerations The SOT-23-5 package and the SC-70 package, like all small packages, has a high thermal resistance. It is important to ensure the IC does not exceed the maximum operating junction (die) temperature of 85°C. The part can be operated up to the absolute maximum temperature rating of 125°C, but between 85°C and 125°C performance will degrade, in particular CMRR will reduce. An MIC918 with no load, dissipates power equal to the quiescent supply current × supply voltage Applications Information The MIC918 is a high-speed, voltage-feedback operational amplifier featuring very low supply current and excellent stability. This device is unity gain stable, capable of driving high capacitance loads. Driving High Capacitance The MIC918 is stable when driving high capacitance, making it ideal for driving long coaxial cables or other high-capacitance loads. Phase margin remains constant as load capacitance is increased. Most high-speed op amps are only able to drive limited capacitance. Note: increasing load capacitance does reduce the speed of the device. In applications where the load capacitance reduces the speed of the op amp to an unacceptable level, the effect of the load capacitance can be reduced by adding a small resistor (<100Ω) in series with the output. Feedback Resistor Selection Conventional op amp gain configurations and resistor selection apply, the MIC918 is NOT a current feedback device. Also, for minimum peaking, the feedback resistor should have low parasitic capacitance, usually 470Ω is ideal. To use the part as a follower, the output should be connected to input via a short wire. Layout Considerations All high speed devices require careful PCB layout. The following guidelines should be observed: Capacitance, particularly on the two inputs pins will degrade performance; avoid large copper traces to the inputs. Keep the output signal away from the inputs and use a ground plane. ( ) PD(no load) = VV + − VV − IS When a load is added, the additional power is dissipated in the output stage of the op amp. The power dissipated in the device is a function of supply voltage, output voltage and output current. ( ) PD(output stage) = VV + − VOUT IOUT Total Power Dissipation = PD(no load) + PD(output stage) Ensure the total power dissipated in the device is no greater than the thermal capacity of the package. The SOT23-5 package has a thermal resistance of 260C/W. Max . Allowable Power Dissipation = MIC918 6 TJ (max) − TA(max) 260W October 2001 MIC918 Micrel Package Information 1.90 (0.075) REF 0.95 (0.037) REF 1.75 (0.069) 1.50 (0.059) 3.00 (0.118) 2.60 (0.102) DIMENSIONS: MM (INCH) 1.30 (0.051) 0.90 (0.035) 3.02 (0.119) 2.80 (0.110) 0.20 (0.008) 0.09 (0.004) 10° 0° 0.15 (0.006) 0.00 (0.000) 0.50 (0.020) 0.35 (0.014) 0.60 (0.024) 0.10 (0.004) SOT-23-5 (M5) 0.65 (0.0256) BSC 1.35 (0.053) 2.40 (0.094) 1.15 (0.045) 1.80 (0.071) 2.20 (0.087) 1.80 (0.071) DIMENSIONS: MM (INCH) 1.00 (0.039) 1.10 (0.043) 0.80 (0.032) 0.80 (0.032) 0.10 (0.004) 0.00 (0.000) 0.30 (0.012) 0.15 (0.006) 0.18 (0.007) 0.10 (0.004) 0.30 (0.012) 0.10 (0.004) SC-70 (C5) MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 2001 Micrel Incorporated October 2001 7 MIC918