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MIC911
105MHz Low-Power SOT23-5 Op Amp
General Description
The MIC911 is a high-speed operational amplifier which is unity gain stable regardless of resistive and capacitive load. It provides a gain-bandwidth product of 105MHz, a very low 1.25mA supply current, and features the Ittybitty(R) SOT23-5 package. Supply voltage range is from 2.5V to 9V, allowing the MIC911 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC911 is stable driving any capacitive 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 MIC911 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.
Features
* * * * * * * 05MHz gain bandwidth product 1.25mA supply current Unconditionally unity gain stable Drives any capacitive load SOT23-5 package 120V/s slew rate 112dB CMRR
Applications
* * * * * * Video Imaging Ultrasound Portable equipment Line drivers XDSL
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Ordering Information
Part Number MIC911BM5 MIC911YM5 Temperature Range -40 to +85C -40 to +85C Package 5-Pin SOT23 5-Pin SOT23 Lead Finish Standard Pb-Free
IttyBitty is a registered trademark of Micrel, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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MIC911
Pin Configuration
IN+
3
Functional Pinout
V+ OUT
2 1
IN+ Part Identification
3
V+ OUT
2 1
A22
4 5 4 5
IN-
V-
IN-
V-
SOT23-5
SOT23-5
Pin Description
Pin Number 1 2 3 4 5 Pin Name OUT V+ IN+ IN- V- Pin Function Output: Amplifier Output Positive Supply (Input) Non-inverting Input Inverting Input Negative Supply (Input)
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Absolute Maximum Ratings(1)
Supply Voltage (VV+ - VV-) .............................................20V Differential Input Voltage (|VIN+ - VIN-|)(3) .........................4V Input Common-Mode Range (VIN+ - VIN-) .............VV+ to VV- Lead Temperature (soldering, 5 sec.)........................ 260C Storage Temperature (Ts) .......................................... 150C ESD Rating(4) ............................................................... 1.5kV
Operating Ratings(2)
Supply Voltage (VS)......................................... 2.5V to 9V Junction Temperature (TJ) .......................... -40C to +85C Thermal Resistance ...............................................260C/W
Electrical Characteristics (5V)
VV+ = +5V, VV- = -5V, VCM = 0V, VOUT = 0V; RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted. Symbol VOS Parameter Input Offset Voltage Input Offset Voltage Temperature Coefficient IB IOS VCM CMRR PSRR AVOL VOUT Input Bias Current Input Offset Current Input Common-Mode Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing CMRR > 60dB -3V < VCM < +3V 5V < VS < 9V RL = 2k, VOUT = 2V RL = 200, VOUT = 1V positive, RL = 2k negative, RL = 2k positive, RL = 200 negative, RL = 200, Note 5 negative, RL = 200, 25C TJ +85C, Note 5 GBW BW SR IGND Unity Gain-Bandwidth Product -3dB Bandwidth Slew Rate Short-Circuit Output Current Supply Current source sink RL = 1k AV = 2, RL = 470 95 70 100 65 17 1.25 1.8 2.3 +2.8 +2.5 -2.5 -1.7 -1.0 -1.7 -3.5 80 75 65 65 +3.3 +3.0 -3.5 3.2 -3.3 -3.0 110 88 78 78 3.5 Condition Min Typ 1 4 1.5 0.03 4 8 2 3 +3.5 Max 10 Units mV V/C A A A A V dB dB dB dB V V V V V V V V V MHz MHz V/s mA mA mA mA
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Electrical Characteristics
VV+ = +9V, VV- = -9V, VCM = 0V, VOUT = 0V; RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted. Symbol VOS Parameter Input Offset Voltage Input Offset Voltage Temperature Coefficient IB IOS VCM CMRR AVOL VOUT Input Bias Current Input Offset Current 0.03 Input Common-Mode Range Common-Mode Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing CMRR > 60dB -7V < VCM < 7V RL = 2k, VOUT = 6V positive, RL = 2k negative, RL = 2k GBW BW SR IGND Unity Gain-Bandwidth Product -3dB Bandwidth Slew Rate Short-Circuit Output Current Supply Current
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. 5. Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in "Typical Characteristics."
Condition
Min
Typ 1 4 1.5
Max 10
Units mV V/C
4 8 2 3 +7.5
A A A A V dB dB V V
-7.5 80 65 +7.2 +6.8 -7.4 105 80 120 80 22 1.35 112 80 +7.4
-7.2 -6.8
V V MHz MHz V/s mA mA
RL = 1k AV = 2, RL = 470 source sink
1.9 2.4
mA mA
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MIC911
Test Circuits
VCC 10F
VCC
0.1F Input
BNC
R2 5k 10F
0.1F 10k 10k 2k
4 2
BNC
MIC911
3 5
1
BNC
Input
R1 5k R7c 2k
4
2
0.1F
1 BNC
Output
MIC911
3 5
Output
10k
0.1F
R6
Input
BNC
0.1F 0.1F
All resistors 1%
5k
R3 200k R4
R5 5k
10F VEE
All resistors: 1% metal film VEE
10F
R2 R2 + R 5 + R4 VOUT = VERROR 1+ + R1 R7
PSRR vs. Frequency
CMRR vs. Frequency
100pF
VCC 10F
10pF R1
R2 4k
R3 27k S1 S2
4
2
0.1F
1 BNC
MIC911
3 5
R5
R4 27k
0.1F
To Dynamic Analyzer
10pF VEE
10F
Noise Measurement
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Typical Characteristics
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Typical Characteristics (continued)
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Typical Characteristics (continued)
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Typical Characteristics (continued)
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Functional Characteristics
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Functional Characteristics (continued)
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MIC911 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 is 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 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. A MIC911 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 260C/W.
Max. Allowable Power Dissipation = TJ(max) - TA(max) 260W
Application Information
The MIC911 is a high-speed, voltage-feedback operational amplifier featuring very low supply current and excellent stability. This device is unity gain stable and capable of driving high capacitance loads. Driving High Capacitance The MIC911 is stable when driving any 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 (<100) in series with the output. Feedback Resistor Selection Conventional op amp gain configurations and resistor selection apply; the MIC911 is NOT a current feedback device. Resistor values in the range of 1k to 10k are recommended. Layout Considerations All high speed devices require careful PCB layout. The high stability and high PSRR of the MIC911 make this op amp easier to use than most, but 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.
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Package Information
5-Pin SOT23 (M5)
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
The 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. (c) 2000 Micrel, Incorporated.
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