MIC912BM5TR

MIC912 200MHz Low-Power SOT23-5 Op Amp General Description Features The MIC912 is a high-speed, operational amplifier with a gain-bandwidth product of 200MHz. The part is unity-gain stable provided its output is loaded with at least 200Ω. It has a very low, 2.4mA supply current, and features the tiny SOT23-5 package. Supply voltage range is from ±2.5V to ±9V, allowing the MIC912 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC912 is stable driving any capacitive load and achieves excellent PSRR, making it much easier to use than most conventional high-speed devices. Low supply voltage, low power consumption, and small packing make the MIC912 ideal for portable equipment. The ability to drive capacitive loads also makes it possible to drive long coaxial cables. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • 200MHz gain bandwidth product 2.4mA supply current SOT23-5 package 360V/µs slew rate Drives any capacitive load Unconditionally stable with gain of +2 or –1 Conditionally stable with gain of +1 Applications • • • • • Video Imaging Ultrasound Portable equipment Line drivers ___________________________________________________________________________________________________________ Ordering Information Part Number Temperature Range Package Lead Finish MIC912BM5 –40° to +85°C 5-Pin SOT23 Standard MIC912YM5 –40° to +85°C 5-Pin SOT23 Pb-Free Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com October 2007 M9999-100507 Micrel, Inc. MIC912 Pin Configuration Functional Pinout IN+ 3 V+ OUT 2 1 IN+ 3 Part Identification V+ OUT 2 1 A23 4 5 IN– V– SOT23-5 4 5 IN– V– SOT23-5 Pin Description Pin Number Pin Name 1 OUT 2 V+ Positive Supply (Input) 3 IN+ Non-inverting Input 4 IN– Inverting Input 5 V– Negative Supply (Input) October 2007 Pin Function Output: Amplifier Output 2 M9999-100507 Micrel, Inc. MIC912 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VV+ – VV–) .............................................20V Differential Input Voltage (|VIN+ – VIN–|)(3) .........................8V Input Common-Mode Range (VIN+ – VIN–) .............VV+ to VV– Lead Temperature (soldering, 5 sec.)........................ 260°C Storage Temperature (Ts) .......................................... 150°C ESD Rating(4) ............................................................... 1.5kV Supply Voltage (VS)......................................... ±2.5V to ±9V Junction Temperature (TJ) .......................... –40°C to +85°C 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 VOS IB IOS Parameter Condition Min Typ Max Input Offset Voltage 1 15 Input Offset Voltage Temperature Coefficient 4 Input Bias Current 3.5 Input Offset Current 0.05 VCM Input Common-Mode Range CMRR > 60dB CMRR Common-Mode Rejection Ratio –2.5V < VCM < +2.5V –3.25 70 Power Supply Rejection Ratio ±5V < VS < ±9V 74 5.5 µA 9 µA 3 µA +3.25 90 Large-Signal Voltage Gain VOUT Maximum Output Voltage Swing RL = 2k, VOUT = ±2V dB 90 dB dB 71 dB 60 71 dB +3.3 3.5 V 60 RL = 200Ω, VOUT = ±1V positive, RL = 2kΩ V +3.0 negative, RL = 2kΩ –3.5 positive, RL = 200Ω +3.0 –3.3 V –3.0 V 3.2 V V +2.75 negative, RL = 200Ω V dB 70 AVOL mV µV/°C 60 PSRR Units –2.8 –2.45 V –2.2 V GBW Unity Gain-Bandwidth Product RL = 1kΩ 170 MHz BW –3dB Bandwidth AV = 1, RL = 100Ω 150 MHz SR Slew Rate 325 V/µs IGND Short-Circuit Output Current source 72 mA sink 25 mA Supply Current October 2007 2.4 3 3.5 mA 4.1 mA M9999-100507 Micrel, Inc. MIC912 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 Condition Min Typ Max Units Input Offset Voltage 1 15 mV Input Offset Voltage Temperature Coefficient 4 IB Input Bias Current 3.5 IOS Input Offset Current 0.05 VCM Input Common-Mode Range CMRR > 60dB CMRR Common-Mode Rejection Ratio –6.5V < VCM < 6.5V –7.25 70 µV/°C 5.5 µA 9 µA 3 µA +7.25 V 98 dB dB 60 AVOL Large-Signal Voltage Gain RL = 2kΩ, VOUT = ±6V VOUT Maximum Output Voltage Swing positive, RL = 2kΩ 60 73 dB +7.2 +7.4 V V +6.8 negative, RL = 2kΩ –7.4 RL = 1kΩ 200 MHz 360 V/µs –7.2 –6.8 GBW Unity Gain-Bandwidth Product SR Slew Rate IGND Short-Circuit Output Current V V source 90 mA sink 32 mA Supply Current 2.5 3.7 mA 4.3 mA Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to change). 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. October 2007 4 M9999-100507 Micrel, Inc. MIC912 Test Circuits VCC 10µF VCC Input 0.1µF 50 BNC R2 5k 10µF 0.1µF 10k 10k 10k 2k 4 2 MIC912 BNC 1 Input R1 5k BNC Output 4 R7c 2k 2 0.1µF MIC912 3 3 5 5 1 BNC Output 0.1µF R6 Input BNC 0.1µF 5k R3 200k 0.1µF All resistors: 1% metal film All resistors 1% 10µF PSRR vs. Frequency R4 CMRR vs. Frequency 100pF 10pF R3 27k S1 S2 R5 10µF VEE ⎛ R2 R2 + R 5 + R4 ⎞ VOUT = VERROR ⎜ 1+ + ⎟ ⎝ R1 ⎠ R7 VEE R1 R5 5k R4 27k VCC R2 4k 4 10µF 2 0.1µF MIC912 1 3 5 10pF 0.1µF BNC To Dynamic Analyzer 10µF VEE Noise Measurement October 2007 5 M9999-100507 Micrel, Inc. MIC912 Typical Characteristics October 2007 6 M9999-100507 Micrel, Inc. MIC912 Typical Characteristics (continued) October 2007 7 M9999-100507 Micrel, Inc. MIC912 Typical Characteristics (continued) October 2007 8 M9999-100507 Micrel, Inc. MIC912 Functional Characteristics October 2007 9 M9999-100507 Micrel, Inc. MIC912 Functional Characteristics (continued) October 2007 10 M9999-100507 Micrel, Inc. MIC912 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. Application Information The MIC912 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 MIC912 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 MIC910, a more heavily compensated version of the MIC912 which provides extremely stable operation for all load resistance and capacitance. 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 SOT23-5 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. A MIC912 with no load, dissipates power equal to the quiescent supply current * supply voltage. 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+ – VV–)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. Driving High Capacitance The MIC912 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 (