MIC922 Micrel, Inc. MIC922 230MHz Low-Power SC-70 Op Amp General Description Features The MIC922 is a high-speed operational amplifier with a gain-bandwidth product of 230MHz. The part is unity gain stable. It has a very low 2.5mA supply current, and features the Teeny™ SC-70 package. Supply voltage range is from ±2.5V to ±9V, allowing the MIC922 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC922 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 MIC922 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables. • • • • • • • 230MHz gain bandwidth product 400MHz –3dB bandwidth 2.5mA supply current SC-70 package 1500V/µs slew rate Drives any capacitive load Unity gain stable Applications • • • • • Video Imaging Ultrasound Portable equipment Line drivers Ordering Information Part Number Standard MIC922BC5 Marking A39 Pb-Free MIC922YC5 Marking A39 Ambient Temperature Package –40ºC to +85ºC SC-70-5 Functional Pinout Pin Configuration IN– V– IN+ 2 3 1 A39 4 5 OUT V+ IN– Part Identification V– IN+ 2 3 1 4 5 OUT V+ SC-70 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) Teeny is a trademark of Micrel, Inc. Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-100 • http://www.micrel.com May 2006 1 MIC922 MIC922 Micrel, Inc. Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VV+ – VV–) ........................................... 20V Differential 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 SC-70-5 (θJA)..................................................... 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 VOS Input Offset Voltage IB Input Bias Current VOS VOS Temperature Coefficient IOS Input Offset Current VCM Condition CMRR Common-Mode Rejection Ratio Power Supply Rejection Ratio AVOL Large-Signal Voltage Gain VOUT Maximum Output Voltage Swing Typ Max Units -5 0.8 5 mV 15 1.7 -2 0.3 –3.25 Input Common-Mode Range PSRR Min –2.5V < VCM < +2.5V µV/°C 4.5 µA 2 µA +3.25 V 75 80 dB 68 87 dB RL = 2kΩ, VOUT = ±2V 65 74 dB 77 dB positive, RL = 2kΩ +3 ±3.5V < VS < ±9V RL = 100Ω, VOUT = ±1V negative, RL = 2kΩ positive, RL = 100Ω 3.6 –3.6 +2.7 negative, RL = 100Ω, Note 5 V –3 V –2.3 V 3.0 –2.6 V CL = 1.7pF 200 MHz 49 ° Av = 1, CL = 1.7pF 320 MHz 420 V/µs 78 mA GBW Unity Gain-Bandwidth Product PM Phase Margin BW –3dB Bandwidth SR Slew Rate C=1.7pF, Gain=1, VOUT=4VPP negative SR = 360V/µs ISC Short-Circuit Output Current source 65 sink 40 IS Supply Current No Load 2.5 Input Voltage Noise f = 10kHz 9 V/√Hz Input Current Noise f = 10kHz 1.1 A/√Hz CL = 1.7pF 47 mA 3 mA 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 Condition Min Typ Max Units -5 0.4 5 mV Input Offset Voltage Temperature Coefficient 15 µV/°C Input Bias Current 1.7 4.5 µA IOS Input Offset Current 0.3 2 µA CMRR Common-Mode Rejection Ratio PSRR Power Supply Rejection Ratio IB VCM MIC922 –7.25 Input Common-Mode Range –6.5V < VCM < +6.5V ±3.5V < VS < ±9V 2 +7.25 V 58 83 dB 68 87 dB May 2006 MIC922 Micrel, Inc. Symbol Parameter Condition Min Typ AVOL Large-Signal Voltage Gain RL = 2kΩ, VOUT = ±3V 65 76 dB 86 dB VOUT Maximum Output Voltage Swing positive, RL = 2kΩ 7 GBW Unity Gain-Bandwidth Product PM Phase Margin BW –3dB Bandwidth SR Slew Rate C=1.7pF, Av =1, VOUT=8VPP, positive SR = 750V/µs ISC Short-Circuit Output Current source 70 sink 40 IS Supply Current No Load 2.5 Input Voltage Noise f = 10kHz 9 nV/√Hz Input Current Noise f = 10kHz 1.1 pA/√Hz RL = 100Ω, VOUT = ±1V negative, RL = 2kΩ 7.5 –7.5 CL = 1.7pF CL = 1.7pF AV = 1, CL = 1.7pF Max Units V –7 V 230 MHz 44 ° 400 MHz 1500 V/µs 84 mA 50 mA 3 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.” May 2006 3 MIC922 MIC922 Micrel, Inc. Test Circuits V+ 10µF Input BNC V+ 0.1µF 50Ω R2 5k 0.1µF 10k 10k 10k 2k 3 1 5 MIC922 4 BNC Input Output R1 5k BNC Input 3 R7c 2k 2 1 R7b 200Ω R7a 100Ω 50Ω 5k 50Ω All resistors: 1% metal film R3 200k 0.1µF All resistors 1% 10µF 0.1µF 2 4 BNC Output 0.1µF R5 5k 10µF V– R4 250Ω R2 R2 + R 5 + R4 VOUT = VERROR 1 + + R1 R7 V– PSRR vs. Frequency 100pF 5 MIC922 R6 0.1µF BNC 10µF CMRR vs. Frequency V+ V+ 10µF 10pF R1 20Ω R3 27k S1 S2 R5 20Ω R2 4k 3 3 1 R4 27k 10µF 5 0.1µF MIC922 2 10pF 4 0.1µF BNC To Dynamic Analyzer VIN 0.1µF MIC922 2 4 0.1µF 50Ω 300Ω VOUT FET Probe CL 10µF 10µF V– V– Noise Measurement MIC922 1 5 Closed Loop Frequency Response Measurement 4 May 2006 MIC922 Micrel, Inc. Typical Characteristics 85°C 2.30 2.25 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 SUPPLY VOLTAGE (V) 85°C 2.0 2.7 3.4 4.1 4.8 5.5 6.2 6.9 7.6 8.3 9.0 25°C SUPPLY VOLTAGE ±V) ( V± = ±9V 25°C –40°C 85°C Output Voltage vs. Output Current Output Voltage vs. Output Current OUTPUT VOLTAGE (V) 0.5 Sinking 0 V± = ±5V -0.5 -1.0 -1.5 -2.0 –40°C -2.5 25°C -3.0 -3.5 -4.0 85°C -4.5 -5.0 -50-45-40-35-30-25-20-15-10 -5 0 OUTPUT CURRENT (mA) 6 0 -6 -12 -18 -24 -30 -36 -42 -48 -54 -60 NOISE VOLTAGE (nV/HZ) –40°C Output Voltage vs. Output Current 5.5 5.0 Sourcing V± = ±5V 4.5 4.0 3.5 3.0 2.5 –40°C 2.0 1.5 85°C 1.0 0.5 25°C 0 0 10 20 30 40 50 60 70 80 OUTPUT CURRENT (mA) -9.0 -7.2 -5.4 -3.6 -1.8 0 1.8 3.6 5.4 7.2 9.0 OFFSET VOLTAGE (mV) OFFSET VOLTAGE (mV) OUTPUT VOLTAGE (V) Short-Circuit Current vs. Supply Voltage 99 90 Sourcing 81 72 63 54 45 36 27 18 9 0 8 7 6 5 4 3 2 1 0 -1 -2 -3 COMMON-MODE VOLTAGE (V) Output Voltage vs. Output Current 9.9 9.0 Sourcing V± = ±9V 8.1 7.2 6.3 –40°C 5.4 4.5 3.6 2.7 +25°C 1.8 +85°C 0.9 0 0 10 20 30 40 50 60 70 80 90 OUTPUT CURRENT (mA) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE °C) ( Offset Voltage vs. Common-Mode Voltage Offset Voltage vs. Common-Mode Voltage 8 7 V± = ±5V 25°C 6 5 4 –40°C 3 2 1 0 85°C -1 -2 -3 -5 -4 -3 -2 -1 0 1 2 3 4 5 COMMON-MODE VOLTAGE (V) V± = ±9V 0.2 OUTPTU VOLTAGE (V) 2.25 -40 -20 0 20 40 60 80 100 TEMPERATURE °C) ( V± = ±5V 0.4 OUTPUT VOLTAGE (V) V± = ±2.5V 2.30 SHORT-CIRCUIT CURRENT (mA) 0.6 2.35 2.35 V± = ±2.5V 1 0.8 2.40 2.40 May 2006 25°C 2.45 V± = ±5V Offset Voltage vs. Temperature 1.2 Short Circuit Current vs. Supply Voltage Sinking 0.9 Sinking 0.0 V± = ±9V -0.9 -1.8 25°C -2.7 -3.6 -4.5 -5.4 –40°C -6.3 -7.2 -8.1 85°C -9.0 -60-54-48-42-36-30-24-18-12 -6 0 OUTPUT CURRENT (mA) 3 Bias Current vs. Temperature 2.5 25°C –40°C SUPPLY VOLTAGE ±V) ( 5 V± = ±2.5V 2 1.5 85°C 2.0 2.7 3.4 4.1 4.8 5.5 6.2 6.9 7.6 8.3 9.0 2.45 1.4 OFFSET VOLTAGE (mV) 2.50 2.55 2.50 –40°C 2.55 V± = ±9V 2.60 2.60 INPUT BIAS CURRENT (µA) 2.65 Supply Current vs. Supply Voltage SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 2.70 Supply Current vs. Temperature V± = ±5V 1 0.5 V± = ±9V 0 -40 -20 0 20 40 60 80 100 TEMPERATURE °C) ( MIC922 MIC922 Micrel, Inc. SUPPLY VOLTAGE ±V) ( Gain Bandwidth and Phase Margin vs. Load 100 45 50 0 0 POSITIVE SLEW RATE (V/µs) 800 700 Gain Bandwidth 40 150 45 100 40 50 35 200 400 600 800 1000 LOAD CAPACITANCE (pF) 0 0 Positive Slew Rate 1400 V± = ±9V 500 400 300 200 150 50 150 100 50 200 400 600 800 1000 LOAD CAPACITANCE (pF) CLOSED-LOOP GAIN (dB) SLEW RATE (V/µs) 200 0 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 100 Closed Loop Gain vs. Frequency 250 PHASE MARGIN (°) 200 Negative Slew Rate 300 MIC922 250 LOAD CAPACITANCE (pF) 100 90 80 70 60 50 40 30 20 10 0 1x10 1M6 V± = ±5V 300 LOAD CAPACITANCE (pF) V± = ±5V Positive Slew Rate 350 400 0 450 400 600 0 0 0 V± = ±9V 800 200 350 Negative Slew Rate 1000 100 400 30 200 400 600 800 1000 LOAD CAPACITANCE (pF) 1200 SLEW RATE (V/µs) 600 35 Gain Bandwidth 50 49 Phase Margin 48 220 47 210 Gain Bandwidth 46 200 45 190 44 180 43 170 42 160 41 40 150 0 1 2 3 4 5 6 7 8 9 10 SUPPLY VOLTAGE ±V) ( 230 0 100 200 300 400 500 600 700 800 900 1000 50 50 Phase Margin 240 55 GAIN BANDWIDTH (MHz) 150 200 V± = ±5V SLEW RATE (V/µs) 55 250 V± = ±5V 1.7pF 220pF 100pF 1000pF 800pF 600pF 6 10x10 100x10 100M 10M6 FREQUENCY (Hz) 6 500x106 LOAD CAPACITANCE (pF) CLOSED-LOOP GAIN (dB) Phase Margin 60 180 135 90 45 0 -45 -90 -135 -180 -225 -270 Gain Bandwidth and Phase Margin vs. Supply Voltage Gain Bandwidth and Phase Margin vs. Load GAIN BANDWIDTH (MHz) 200 V± = ±9V PHASE MARGIN (°) GAIN BANDWIDTH (MHz) 250 Open-Loop Frequency Response 60 RL = 100Ω 50 Phase 40 No Load 30 20 Gain 10 0 RL = 100Ω -10 -20 -30 V± = ±5V -40 100M 10M 1M CAPACITIVE LOAD (pF) PHASE MARGIN (°) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 85°C PHASE MARGIN (°) 25°C 180 135 90 45 0 -45 -90 -135 -180 -225 -270 PHASE MARGIN (°) GAIN BANDWIDTH (MHz) BIAS CURRENT (±V) –40°C 60 50 Phase Margin RL = 100Ω 40 No Load 30 20 10 Gain Bandwidth 0 RL = 100Ω -10 -20 -30 V± = ±9V -40 100M 10M 1M CAPACITIVE LOAD (pF) GAIN BANDWIDTH (MHz) Open-Loop Frequency Response Bias Current vs. Supply Voltage 4.4 4.0 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 6 1x10 1M Closed-Loop Gain vs. Frequency V± = ±9V 1.7pF 100pF 1000pF 800pF 220pF 400pF 600pF 10x10 100x10 100M6 10M6 FREQUENCY (Hz) 500x106 May 2006 Micrel, Inc. 60 50 40 30 20 10 0 -10 -20 -30 -40 1M May 2006 Open-Loop Gain vs. Frequency V± = ±5V 1.7pF 50pF 100pF 225pF 1000pF 675pF 450pF 10M 100M FREQUENCY (Hz) 60 50 40 30 20 10 0 -10 -20 -30 -40 1M OPEN-LOOP GAIN (dB) OPEN-LOOP GAIN (dB) MIC922 Open-Loop Gain vs. Frequency V± = ±9V 1.7pF 50pF 100pF 225pF 450pF 675pF 1000pF 100M 10M FREQUENCY (Hz) 7 MIC922 MIC922 Micrel, Inc. Functional Characteristics INPUT (50mV/div) Small Signal Response V± = ±5.0V Av = 1 CL = 1.7µF RL = 1MΩ OUTPUT (50mV/div) Small Signal Response Small Signal Response INPUT (50mV/div) TIME (100ns/div) TIME (100ns/div) Small Signal Response Small Signal Response INPUT (50mV/div) TIME (100ns/div) V± = ±5.0V Av = 1 CL = 1000pF RL = 1MΩ V± = ±9.0V Av = 1 CL = 1000pF RL = 1MΩ OUTPUT (50mV/div) OUTPUT (50mV/div) INPUT (50mV/div) V± = ±9.0V Av = 1 CL = 100pF RL = 1MΩ OUTPUT (50mV/div) V± = ±5.0V Av = 1 CL = 100pF RL = 1MΩ TIME (100ns/div) MIC922 V± = ±9.0V Av = 1 CL = 1.7µF RL = 1MΩ TIME (100ns/div) OUTPUT (50mV/div) INPUT (50mV/div) OUTPUT (50mV/div) INPUT (50mV/div) Small Signal Response TIME (100ns/div) 8 May 2006 MIC922 Micrel, Inc. Large Signal Response OUTPUT (1V/div) OUTPUT (2V/div) Large Signal Response V± = ±5.0V Av = 1 CL = 1.7µF RL = 1MΩ Positive Slew Rate = 418V/µs Negative Slew Rate = 356V/µs V± = ±9.0V Av = 1 CL = 1.7µF RL = 1MΩ Positive Slew Rate = 747V/µs Negative Slew Rate = 1320V/µs Large Signal Response Large Signal Response OUTPUT (2V/div) TIME (25ns/div) OUTPUT (1V/div) TIME (25ns/div) V± = ±5.0V Av = 1 CL = 100pF RL = 1MΩ Positive Slew Rate = 350V/µs Negative Slew Rate = 303V/µs V± = ±9.0V Av = 1 CL = 100pF RL = 1MΩ Positive Slew Rate = 274V/µs Negative Slew Rate = 274V/µs TIME (25ns/div) Large Signal Response Large Signal Response OUTPUT (1V/div) OUTPUT (2V/div) TIME (25ns/div) V± = ±9.0V Av = 1 CL = 1000pF RL = 1MΩ Positive Slew Rate = 78V/µs Negative Slew Rate = 51V/µs V± = ±5.0V Av = 1 CL = 1000pF RL = 1MΩ Positive Slew Rate = 106V/µs Negative Slew Rate = 66V/µs TIME (250ns/div) May 2006 TIME (250ns/div) 9 MIC922 MIC922 Micrel, Inc. Applications Information 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 resis-tance). Surface-mount ceramic capacitors are ideal. Thermal Considerations The SC70-5 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 par-ticular CMRR will reduce. An MIC922 with no load, dissipates power equal to the quiescent supply current × supply voltage PD(no load) = (VV+ – VV-)IS The MIC922 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 MIC922 is stable when driving high capacitance, making it ideal for driving long coaxial cables or other high-capacitance loads. 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/Capacitor Selection Conventional op amp gain configurations and resistor selection apply, the MIC922 is NOT a current feedback device. Also, for minimum peaking, the feedback resistor should have low parasitic capacitance. To use the part as a follower, the output should be connected to input via a short wire. At high frequency, the parasitic capacitance at the input might cause peaking in the closed-loop frequency response. A 1pF capacitor should be used across the feedback resistor to compensate for this parasitic peaking. Layout Considerations All high speed devices require careful PCB layout. The following guidelines should be observed: Capacitance, par-ticularly 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. MIC922 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+ – VVOUT)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 SC70-5 package has a thermal resistance of 450°C/W. TJ(max) – TA(max) Max. Allowable Power Dissipation = 450°C/W 10 May 2006 MIC922 Micrel, Inc. Package Information SC-70 (C5) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2002 Micrel, Inc. May 2006 11 MIC922