MIC914 Micrel MIC914 160MHz Low-Power SOT-23-5 Op Amp General Description Features The MIC914 is a high-speed operational amplifier with a gainbandwidth product of 160MHz. The part is unity gain stable provided its output is loaded with at least 200Ω. It has a very low 1.25mA supply current, and features the IttyBitty™ SOT-23-5 package. Supply voltage range is from ±2.5V to ±9V, allowing the MIC914 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC914 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 MIC914 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables. • • • • • • 160MHz gain bandwidth product 1.25mA supply current SOT-23-5 package 160V/µs slew rate drives any capacitive load 112dB CMRR Applications • • • • • • Video Imaging Ultrasound Portable equipment Line drivers XDSL Ordering Information Pin Configuration IN+ 3 Part Number Junction Temp. Range Package MIC914BM5 –40°C to +85°C SOT-23-5 Functional Pinout V+ OUT 2 1 IN+ Part Identification 3 V+ OUT 2 1 A26 4 5 4 5 IN– V– IN– V– SOT-23-5 SOT-23-5 Pin Description Pin Number Pin Name Pin Function 1 OUT 2 V+ Positive Supply (Input) 3 IN+ Noninverting Input 4 IN– Inverting Input 5 V– Negative Supply (Input) Output: Amplifier Output Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com June 2000 1 MIC914 MIC914 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 ............................... 260°C/W Electrical Characteristics (±5V) VV+ = +5V, VV– = –5V, VCM = 0V, VOUT = 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted. Symbol Parameter VOS Condition Min Typ Max Units Input Offset Voltage 1 10 mV VOS Input Offset Voltage Temperature Coefficient 4 IB Input Bias Current IOS Input Offset Current 1.5 0.03 4 8 µA µA 2 3 µA µA +3.5 V VCM Input Common-Mode Range CMRR > 60dB CMRR Common-Mode Rejection Ratio –3V < VCM < +3V 80 110 dB PSRR Power Supply Rejection Ratio ±5V < VS < ±9V 75 88 dB AVOL Large-Signal Voltage Gain RL = 2k, VOUT = ±2V 65 78 dB RL = 200Ω, VOUT = ±1V 65 78 dB +3.3 +3.0 3.5 V V VOUT Maximum Output Voltage Swing positive, RL = 2kΩ –3.5 µV/°C negative, RL = 2kΩ positive, RL = 200Ω –3.5 +2.8 +2.5 negative, RL = 200Ω, Note 5 –3.3 –3.0 3.2 –2.5 negative, RL = 200Ω, 25°C ≤ TJ ≤ +85°C, Note 5 V V V V –1.7 –1.0 V V –1.7 V GBW Unity Gain-Bandwidth Product RL = 1kΩ 135 MHz BW –3dB Bandwidth AV = 2, RL = 470Ω 155 MHz SR Slew Rate 135 V/µs IGND Short-Circuit Output Current source 65 mA sink 17 mA IGND Supply Current 1.25 1.8 2.3 mA mA Electrical Characteristics VV+ = +9V, VV– = –9V, VCM = 0V, VOUT = 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter VOS Typ Max Units Input Offset Voltage 1 10 mV VOS Input Offset Voltage Temperature Coefficient 4 IB Input Bias Current MIC914 Condition Min 1.5 2 µV/°C 4 8 µA µA June 2000 MIC914 Micrel Symbol Parameter IOS Input Offset Current Condition Min Typ Max Units 0.03 2 3 µA µA +7.5 V VCM Input Common-Mode Range CMRR > 60dB –7.5 CMRR Common-Mode Rejection Ratio –7V < VCM < 7V 80 112 dB AVOL Large-Signal Voltage Gain RL = 2kΩ, VOUT = ±6V 65 80 dB VOUT Maximum Output Voltage Swing positive, RL = 2kΩ +7.2 +6.8 +7.4 V V negative, RL = 2kΩ –7.4 –7.2 –6.8 V V GBW Gain-Bandwidth Product RL = 1kΩ 160 MHz BW –3dB Bandwidth AV = 2, RL = 470Ω 185 MHz SR Slew Rate 160 V/µs IGND Short-Circuit Output Current source 80 mA sink 22 mA Supply Current IGND 1.35 1.9 2.4 mA mA 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.” June 2000 3 MIC914 MIC914 Micrel Test Circuits VCC 10µF VCC 0.1µF 50Ω R2 BNC 5k Input 10µF 0.1µF 10k 10k 10k 2k 4 BNC MIC914 BNC 1 R1 5k Input 2 R7c 2k R7b 200Ω Output 3 5 2 0.1µF MIC914 1 BNC Output 3 5 R7a 100Ω 50Ω BNC 4 0.1µF R6 0.1µF 5k R3 200k Input 50Ω All resistors: 1% metal film CMRR vs. Frequency PSRR vs. Frequency 100pF 10pF R3 27k S1 S2 R5 20Ω R4 250Ω R2 R2 + R 5 + R4 VOUT = VERROR 1 + + R1 R7 10µF VEE R1 20Ω 10µF VEE All resistors 1% 0.1µF R5 5k VCC R2 4k 4 10µF 0.1µF 2 MIC914 1 3 5 BNC To Dynamic Analyzer 0.1µF R4 27k 10pF 10µF VEE Noise Measurement MIC914 4 June 2000 MIC914 Micrel Electrical Characteristics Supply Current vs. Temperature Supply Current vs. Supply Voltage +25°C -40°C 1.0 0.5 2 3 4 5 6 7 8 9 SUPPLY VOLTAGE (±V) 0.0 1.8 VSUPPLY = ±9V 1.6 1.4 VSUPPLY = ±5V 1.2 OFFSET VOLTAGE (mV) SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) +85°C 1.5 Offset Voltage vs. Temperature 2.0 2.0 -1.0 VSUPPLY = ±9V -1.5 1.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 10 Bias Current vs. Temperature -2.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) Offset Voltage vs. Common-Mode Voltage 2.5 VSUPPLY = ±5V -0.5 Offset Voltage vs. Common-Mode Voltage -0.25 -0.5 2 VSUPPLY = ±9V 1 VSUPPLY = ±5V 0.5 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) +25°C -0.75 -40°C -1.00 SOURCING CURRENT 65 60 VSUPPLY = ±5V 55 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) -20 SINKING CURRENT -25 VSUPPLY = ±9V OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) +25°C +85°C SINKING CURRENT 3 4 5 6 7 8 9 SUPPLY VOLTAGE (±V) +25°C 60 10 3.5 VSUPPLY = ±5V -40°C 2.0 1.5 +25°C 1.0 0.5 0 0 -40°C SOURCING CURRENT 3 4 5 6 7 8 9 SUPPLY VOLTAGE (±V) 10 Output Voltage vs. Output Current 0.0 +85°C 3.0 2.5 +85°C 40 Output Voltage vs. Output Current -40°C -20 80 20 2 4.0 -15 June 2000 VSUPPLY = ±5V -30 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) -10 -30 2 100 -15 Short-Circuit Current vs. Supply Voltage -25 Short-Circuit Current vs. Supply Voltage OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) VSUPPLY = ±9V 80 70 -1.5 -8 -6 -4 -2 0 2 4 6 8 COMMON-MODE VOLTAGE (V) -10 90 +25°C -40°C Short-Circuit Current vs. Temperature 95 75 +85°C -1.0 -1.25 -5 -4 -3 -2 -1 0 1 2 3 4 5 COMMON-MODE VOLTAGE (V) Short-Circuit Current vs. Temperature 85 +85°C SOURCING CURRENT 20 40 60 80 OUTPUT CURRENT (mA) 5 OUTPUT VOLTAGE (V) 1.5 -0.50 VSUPPLY = ±9V OFFSET VOLTGE (mV) OFFSET VOLTGE (mV) BIAS CURRENT (µA) VSUPPLY = ±5V SINKING CURRENT -0.5 -1.0 +25°C -40°C -1.5 -2.0 -2.5 +85°C -3.0 -3.5 -4.0 -25 VSUPPLY = ±5V -20 -15 -10 -5 OUTPUT CURRENT (mA) 0 MIC914 MIC914 Micrel Gain Bandwidth and Phase Margin vs. Capacitive Load 150 0 GAIN BANDWIDTH (MHz) -40°C +85°C -6 -8 VSUPPLY = ±9V 175 60 50 Phase Margin 100 40 VSUPPLY = ±9V 75 50 0 20 Gain Bandwidth 25 0 30 10 0 200 400 600 800 1000 CAPACITIVE LOAD (pF) 150 30 100 100 20 15 Phase Margin 60 VSUPPLY = ±5V 40 10 25 5 20 0 10 0 3 4 5 6 7 8 9 SUPPLY VOLTAGE (±V) 0 200 400 600 800 1000 CAPACITIVE LOAD (pF) 80 50 0 2 10 Common-Mode Rejection Ratio 120 25 75 25 35 125 20 Gain Bandwidth 1x107 70 150 30 1x106 175 GAIN BANDWIDTH (MHz) Gain Bandwidth and Phase Margin vs. Supply Voltage 125 50 0 40 VSUPPLY = ±5V 75 0 0 Gain Bandwidth and Phase Margin vs. Capacitive Load Gain Bandwidth 100 1x105 -20 -10 OUTPUT CURRENT (mA) 50 Phase Margin 1x104 -10 -30 125 1x103 -4 60 1x102 +25°C 4 3 -40°C 2 SOURCING 1 CURRENT 0 0 20 40 60 80 100 OUTPUT CURRENT (mA) -2 SINKING CURRENT CMRR (dB) +85°C +25°C PHASE MARGIN (°) VSUPPLY = ±9V OUTPUT VOLTAGE (V) 10 9 8 7 6 5 PHASE MARGIN (°) Output Voltage vs. Output Current PHASE MARGIN (°) GAIN BANDWIDTH (MHz) OUTPUT VOLTAGE (V) Output Voltage vs. Output Current FREQUENCY (Hz) 80 80 100 VSUPPLY = ±9V 40 1x107 1x106 1x105 1x104 1x103 1x102 1x107 1x106 1x10 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) Positive Power Supply Rejection Ratio Negative Power Supply Rejection Ratio Closed-Loop Frequency Response 1x107 1x106 2 1x107 1x106 1x105 0 1x104 0 1x103 20 1x105 VSUPPLY = ±9V 20 FREQUENCY (Hz) GAIN (dB) 40 1x104 VSUPPLY = ±9V 1x103 40 60 1x10 –PSRR (dB) 80 60 1x10 60 0 100 2 80 20 2 1x107 1x10 1x106 0 1x105 0 1x104 20 1x103 20 80 +PSRR (dB) VSUPPLY = ±5V 1x105 VSUPPLY = ±5V 40 1x104 40 60 1x103 60 CMRR (dB) 120 –PSRR (dB) 100 100 MIC914 Common-Mode Rejection Ratio Negative Power Supply Rejection Ratio 100 2 +PSRR (dB) Positive Power Supply Rejection Ratio 10 8 6 4 2 0 1000pF 50pF 500pF 200pF 0pF 100pF -2 -4 -6 VSUPPLY = ±2.5V -8 AV = 1 -10 1 10 100 200 FREQUENCY (MHz) FREQUENCY (Hz) 6 June 2000 MIC914 Micrel Open-Loop Frequency Response vs. Capacitive Load 0pF -2 -4 -6 VSUPPLY = ±5V -8 -10 1 10 100 200 FREQUENCY (MHz) GAIN (dB) -10 -45 No Load -20 -90 -30 -135 -40 VSUPPLY = ±5V -180 -50 -225 1 10 100 200 FREQUENCY (MHz) PHASE (°) GAIN (dB) RL = 100Ω 50 40 30 20 10 0 RL = 100Ω 1000pF 470pF 200pF 100pF 50pF 0pF -2 -4 -6 VSUPPLY = ±9V -8 -10 1 10 100 200 FREQUENCY (MHz) Closed-Loop Frequency Response Test Circuit Open-Loop Frequency Response 225 180 135 90 45 0 10 8 6 4 2 0 1000pF 470pF 200pF 100pF 50pF Open-Loop Frequency Response 50 40 30 20 10 0 Open-Loop Frequency Response vs. Capacitive Load GAIN (dB) -90 -135 -180 -225 -270 10 100 200 FREQUENCY (MHz) ±2.5V 10 8 6 4 2 0 VCC 225 180 135 90 45 0 -10 -45 -20 -90 No Load -30 -135 -40 VSUPPLY = ±9V -180 -50 -225 1 10 100 200 FREQUENCY (MHz) 10µF 0.1µF PHASE (°) ±5V PHASE GAIN (dB) -2 -4 -6 -8 -10 1 ±9V GAIN 180 135 90 45 0 -45 PHASE (°) GAIN (dB) Closed-Loop Frequency Response 10 8 6 4 2 0 FET probe MIC914 CL RF 50Ω 10µF VEE Negative Slew Rate Positive Slew Rate 150 150 125 125 125 150 7 200 400 600 800 1000 LOAD CAPACITANCE (pF) NOISE CURRENT pA Hz 25 100 50 0 FREQUENCY (Hz) June 2000 7 1x105 50 150 1x102 75 200 1x101 nV Hz NOISE VOLTAGE SLEW RATE (V/µs) 100 0 0 Current Noise 250 VCC = ±9V 200 400 600 800 1000 LOAD CAPACITANCE (pF) Voltage Noise Negative Slew Rate 125 0 0 200 400 600 800 1000 LOAD CAPACITANCE (pF) 6 5 4 3 2 1 0 1x105 0 0 200 400 600 800 1000 LOAD CAPACITANCE (pF) 50 25 1x104 0 0 25 75 1x104 25 50 100 1x103 50 75 VCC = ±9V 1x102 75 VCC = ±5V 100 1x101 VCC = ±5V 1x103 100 SLEW RATE (V/µs) 150 SLEW RATE (V/µs) SLEW RATE (V/µs) Positive Slew Rate FREQUENCY (Hz) MIC914 MIC914 Micrel Small-Signal Pulse Response VCC = ±9V AV = 1 CL = 1.7pF OUTPUT INPUT VCC = ±5V AV = 1 CL = 1.7pF OUTPUT INPUT Small-Signal Pulse Response Small-Signal Pulse Response VCC = ±9V AV = 1 CL = 1000pF OUTPUT INPUT VCC = ±5V AV = 1 CL = 100pF OUTPUT INPUT Small-Signal Pulse Response Small-Signal Pulse Response MIC914 VCC = ±9V AV = 1 CL = 1000pF OUTPUT INPUT VCC = ±5V AV = 1 CL = 100pF OUTPUT INPUT Small-Signal Pulse Response 8 June 2000 MIC914 Micrel Large-Signal Pulse Response Large-Signal Pulse Response OUTPUT OUTPUT VCC = ±5V AV = –1 CL = 1.7pF RL = 470Ω ∆V = 5.28V ∆t = 50ns VCC = ±5V AV = –1 CL = 100pF RL = 470Ω Large-Signal Pulse Response Large-Signal Pulse Response VCC = ±5V AV = –1 CL = 100pF RL = 470Ω VCC = ±9V AV = –1 CL = 100pF RL = 470MΩ ∆V = 5.24V ∆t = 115ns OUTPUT OUTPUT ∆V = 5.52V ∆t = 56ns Large-Signal Pulse Response ∆V = 5.08V ∆t = 38ns Large-Signal Pulse Response June 2000 VCC = ±9V AV = –1 CL = 1000pF RL = 470MΩ OUTPUT OUTPUT VCC = ±9V AV = –1 CL = 1000pF RL = 470MΩ ∆V = 5.48V ∆t = 44ns 9 ∆V = 6.40V ∆t = 115ns MIC914 MIC914 Micrel 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. 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, 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 MIC914 with no load, dissipates power equal to the quiescent supply current * supply voltage Applications Information The MIC914 is a high-speed, voltage-feedback operational amplifier featuring very low supply current and excellent stability. This device is unity gain stable with RL ≤ 200Ω and capable of driving high capacitance loads. Stability Considerations The MIC914 is unity gain stable and it is capable of driving unlimited capacitance loads, but some design considerations are required to ensure stability. The output needs to be loaded with 200Ω resistance or less and/or have sufficient load capacitance to achieve stability (refer to the “Load Capacitance vs. Phase Margin” graph). For applications requiring a little less speed, Micrel offers the MIC911, a more heavily compensated version of the MIC914 which provides extremely stable operation for all load resistance and capacitance. For stability considerations at different supply voltages, please refer to the graph elsewhere in the datasheet entitled "Gain Bandwidth and Phase Margin vs. Supply Voltage". Driving High Capacitance The MIC914 is stable when driving high capacitance (see “Typical Characteristics: Gain Bandwidth and Phase Margin vs. Load 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 (see “Typical Characteristics: Gain Bandwidth and Phase Margin vs. Load”). 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 MIC914 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. MIC914 ( ) 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 260°C/W. Max . Allowable Power Dissipation = 10 TJ (max) − TA(max) 260W June 2000 MIC914 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) 3.02 (0.119) 2.80 (0.110) 0.50 (0.020) 0.35 (0.014) 1.30 (0.051) 0.90 (0.035) 0.20 (0.008) 0.09 (0.004) 10° 0° 0.15 (0.006) 0.00 (0.000) 0.60 (0.024) 0.10 (0.004) SOT-23-5 (M5) June 2000 11 MIC914 MIC914 Micrel MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB 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. © 2000 Micrel Incorporated MIC914 12 June 2000