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MIC918
Micrel
MIC918
51MHz Low-Power SOT-23-5/SC-70 Op Amp Final Information
General Description
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 TM 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.
Features
* 51MHz gain bandwidth product * 550A supply current * SOT-23-5 or SC-70 packages * 1500V/s slew rate * drives any capacitive load * Unity gain stable
Applications
* Video * Imaging * Ultrasound * Portable equipment * Line drivers
Ordering Information
Part Number MIC918BM5 MIC918BC5 Junction Temp. Range -40C to +85C -40C to +85C Package SOT-23-5* SC-70
* Contact factory about SOT-23-5 package.
Pin Configuration
IN-- V-- IN+
3 2 1
Functional Pinout
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 1 2 3 4 5 Pin Name IN+ V- IN- OUT V+ Pin Function Noninverting Input Negative Supply (Input) Inverting Input Output: Amplifier Output 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
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MIC918
MIC918
Micrel
Absolute Maximum Ratings (Note 1)
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.) ....................... 260C Storage Temperature (TS) ........................................ 150C ESD Rating, Note 4 ................................................... 1.5kV
Operating Ratings (Note 2)
Supply Voltage (VS) ....................................... 2.5V to 9V Junction Temperature (TJ) ......................... -40C to +85C Package Thermal Resistance ............................................. SOT-23-5 .......................................................... 260C/W SC-70-5 ............................................................. 450C/W
Electrical Characteristics (5V)
V+ = +5V, V- = -5V, VCM = 0V, RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted. Symbol VOS VOS IB IOS VCM CMRR PSRR AVOL VOUT Parameter Input Offset Voltage VOS Temperature Coefficient Input Bias Current Input Offset Current Input Common-Mode Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain CMRR > 72dB -2.5V < VCM < +2.5V 3.5V < VS < 9V RL = 2k, VOUT = 2V RL = 100, VOUT = 1V Maximum Output Voltage Swing positive, RL = 2k negative, RL = 2k positive, RL = 200 negative, RL = 200, Note 5 GBW PM BW SR ISC IS Unity Gain-Bandwidth Product Phase Margin -3dB Bandwidth Slew Rate Short-Circuit Output Current C=1.7pF, Gain=1, VOUT=5V, peak to peak, positive SR = 450V/s source sink Supply Current Input Voltage Noise Input Current Noise No Load f = 10kHz f = 10kHz 45 20 +1.5 +3.0 -3.25 75 95 65 85 104 82 85 3.6 -3.6 3.0 -2.5 45 54 95 850 63 45 0.55 10 0.8 0.80 -1.0 -3.0 Condition Min Typ 0.43 1 0.26 0.04 0.6 0.3 +3.25 Max 5 Units mV V/C A A V dB dB dB dB V V V V MHz MHz V/s mA mA mA nV/Hz pA/Hz
Electrical Characteristics
V+ = +9V, V- = -9V, VCM = 0V, RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol VOS VOS IB IOS VCM CMRR PSRR Parameter Input Offset Voltage Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Common-Mode Range Common-Mode Rejection Ratio Power Supply Rejection Ratio CMRR > 75dB -6.5V < VCM < +6.5V 3.5V < VS < 9V -7.25 60 95 91 104 Condition Min Typ 0.3 1 0.23 0.04 0.60 0.3 +7.25 Max 5 Units mV V/C A A V dB dB
MIC918
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October 2001
MIC918
Symbol AVOL VOUT GBW PM BW SR ISC IS Parameter Large-Signal Voltage Gain Condition RL = 2k, VOUT = 2V RL = 100, VOUT = 1V Maximum Output Voltage Swing positive, RL = 2k negative, RL = 2k Unity Gain-Bandwidth Product Phase Margin -3dB Bandwidth Slew Rate Short-Circuit Output Current AV = 2, RL = 470 C=1.7pF, Gain=1, VOUT=5V, peak to peak, positive SR = 450V/s source sink Supply Current Input Voltage Noise Input Current Noise
Note 1. Note 2. Note 3. Note 4. Note 5.
Micrel
Min 75 Typ 84 93 6.5 7.5 -7.5 51 55 109 1500 50 30 65 50 0.55 10 0.8 0.8 -6.2 Max Units dB dB V V MHz MHz V/s mA mA mA nV/Hz pA/Hz
RL = 1k
No Load f = 10kHz f = 10kHz
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to change). Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in "Typical Characteristics."
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MIC918
MIC918
Micrel
Typical Characteristics
Offset Voltage vs. Temperature
1.25
SUPPLY CURRENT (mA)
Supply Current vs. Temperature
0.60 V = 9V V = 5V V = 2.5V
SUPPLY CURRENT (A)
Supply Current vs. Supply Voltage
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
OFFSET VOLTAGE (mV)
1.2 1.15 1.1 1.05 1 0.95
V = 2.5V
0.55 0.50 0.45 0.40 0.35
V = 5V V = 9V
+85C +25C
-40C
0.9 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0.30 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
3.8 5.1 6.4 7.7 SUPPLY VOLTAGE (V)
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Offset Voltage vs. Common-Mode Voltage
2.2 2 V = 2.5V 1.8 1.6 -40C 1.4 1.2 +25C 1 0.8 0.6 0.4 0.2 +85C 0 -900 -540 -180 180 540 900 COMMON-MODE VOLTAGE (V) 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 OFFSET VOLTAGE (mV)
OFFSET VOLTAGE (mV)
Offset Voltage vs. Common-Mode Voltage
OFFSET VOLTAGE (mV)
Offset Voltage vs. Common-Mode Voltage
2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 V = 9V
V = 5V
-40C +25C
-40C +25C +85C
1.48 2.96 4.44 5.92 -4.44 -2.96 -1.48 0 7.40
+85C
0.68 1.36 2.04 2.72 -2.04 -1.36 -0.68 0 3.40
-3.40 -2.72
COMMON-MODE VOLTAGE (V)
Positive Slew Rate vs. Load Capacitance
800 700 V+ = 9V
SLEW RATE (V/s)
Negative Slew Rate vs. Load Capacitance
1600 1400 1200 1000 800 600 400 200 V+ = 9V
SLEW RATE (V/s)
500 450 400 350 300 250 200 150 100 50
-7.40 -5.92
COMMON-MODE VOLTAGE (V)
Positive Slew Rate vs. Load Capacitance
V+ = 5V
SLEW RATE (V/s)
600 500 400 300 200 100
1000
900 1000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
Negative Slew Rate vs. Load Capacitance
900 800 700 600 500 400 300 200 100 0
POSITIVE SLEW RATE (V/s)
Positive Slew Rate vs. Supply Voltage
NEGATIVE SLEW RATE (V/s) 800 700 600 500 400 300 200 100 0 0 1 2345678 SUPPLY VOLTAGE (V) 9 1800 1600 1400 1200 1000 800 600 400 200 0 0 1
Negative Slew Rate vs. Supply Voltage
V+ = 5V
SLEW RATE (V/s)
2345678 SUPPLY VOLTAGE (V)
LOAD CAPACITANCE (pF)
MIC918
1000
0 100
200 300
400 500
600 700
800 900
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October 2001
900 1000 9
0 100
0
200 300
400 500
600 700
800 900
100 200
300 400
500 600
700 800
0
100 200
300 400
500 600
700 800
0
0
0
MIC918
Micrel
Voltage Noise
90
CURRENT NOISE (pA/Hz)
Current Noise
6 5 4 3 2 1 0 10 100 1000 10000 100000 FREQUENCY (Hz)
NOISE VOLTAGE (nV/Hz)
80 70 60 50 40 30 20 10 0 10 100 1000 10000 100000 FREQUENCY (Hz)
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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 10F capacitor in parallel with a 0.1F 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 85C. The part can be operated up to the absolute maximum temperature rating of 125C, but between 85C and 125C performance will degrade, in particular CMRR will reduce. An MIC918 with no load, dissipates power equal to the quiescent supply current x 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 + - VOUT IOUT
Total Power Dissipation = PD(no load) + PD(output stage)
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 (<100) 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 470 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.
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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 = TJ (max) - TA(max) 260W
MIC918
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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) 3.02 (0.119) 2.80 (0.110) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
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) 0.18 (0.007) 0.10 (0.004)
0.30 (0.012) 0.15 (0.006)
0.10 (0.004) 0.00 (0.000)
0.30 (0.012) 0.10 (0.004)
SC-70 (C5)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 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. (c) 2001 Micrel Incorporated
October 2001
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MIC918

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