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MIC912
Micrel
MIC912
200MHz Low-Power SOT-23-5 Op Amp
General Description
The MIC912 is a high-speed, unity-gain stable operational amplifier. It provides a gain-bandwidth product of 200MHz with a very low, 2.4mA supply current, and features the tiny SOT-23-5 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 capacitative 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 capacitative loads also makes it possible to drive long coaxial cables.
Features
* * * * * 200MHz gain bandwidth product 2.4mA supply current SOT-23-5 package 360V/s slew rate drives any capacitive load
Applications
* * * * * Video Imaging Ultrasound Portable equipment Line drivers
Ordering Information
Part Number MIC912BM5 Junction Temp. Range -40C to +85C Package SOT-23-5
Pin Configuration
IN+
3
Functional Pinout
V+ OUT
2 1
IN+
V+ OUT
2 1
Part Identification
3
A23
4 5
4 5
IN-
V-
IN-
V-
SOT-23-5
SOT-23-5
Pin Description
Pin Number 1 2 3 4 5 Pin Name OUT V+ IN+ IN- V- Pin Function Output: Amplifier Output Positive Supply (Input) Noninverting Input Inverting Input Negative 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
June 2000
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MIC912
MIC912
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+ - VV-) ........................................... 20V Differentail Input Voltage (VIN+ - VIN-) .......... 8V, Note 4 Input Common-Mode Range (VIN+, VIN-) .......... VV+ to VV- Lead Temperature (soldering, 5 sec.) ....................... 260C Storage Temperature (TS) ........................................ 150C ESD Rating, Note 3 ................................................... 1.5kV
Operating Ratings (Note 2)
Supply Voltage (VS) ....................................... 2.5V to 9V Junction Temperature (TJ) ......................... -40C to +85C Package 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 VOS IB IOS VCM CMRR PSRR AVOL VOUT 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 Large-Signal Voltage Gain CMRR > 60dB -2.5V < VCM < +2.5V 5V < VS < 9V RL = 2k, VOUT = 2V RL = 200, VOUT = 2V Maximum Output Voltage Swing positive, RL = 2k negative, RL = 2k positive, RL = 200 negative, RL = 200 GBW BW SR IGND IGND Gain-Bandwidth Product -3dB Bandwidth Slew Rate Short-Circuit Output Current source sink Supply Current RL = 1k AV = 1, RL = 100 +3.0 +2.75 -3.25 70 60 74 70 60 60 +3.3 +3.0 90 81 71 71 3.5 -3.5 3.2 -2.8 170 150 325 72 25 2.4 3.5 4.1 -2.45 -2.2 -3.3 -3.0 Condition Min Typ 1 4 3.5 0.05 5.5 9 3 +3.25 Max 15 Units mV V/C A A A V dB dB dB dB dB dB V V V V V V V V MHz MHz V/s mA mA mA mA
Electrical Characteristics
VV+ = +9V, VV- = -9V, VCM = 0V, VOUT = 0V; RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol VOS VOS IB IOS Parameter Input Offset Voltage Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Condition Min Typ 1 4 3.5 0.05 5.5 9 3 Max 15 Units mV V/C A A A
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MIC912
Symbol VCM CMRR AVOL VOUT Parameter Input Common-Mode Range Common-Mode Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Condition CMRR > 60dB -6.5V < VCM < 6.5V RL = 2k, VOUT = 6V positive, RL = 2k negative, RL = 2k GBW SR IGND IGND
Note 1. Note 2. Note 3. Note 4.
Micrel
Min -7.25 70 60 60 +7.2 +6.8 98 73 +7.4 -7.4 200 360 source sink Supply Current 90 32 2.5 3.7 4.3 -7.2 -6.8 Typ Max +7.25 Units V dB dB dB V V V V MHz V/s mA mA mA mA
Gain-Bandwidth Product Slew Rate Short-Circuit Output Current
RL = 1k
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to increase).
Test Circuits
VCC 10F
VCC
50
BNC
0.1F
R2 5k 10F
Input 0.1F 10k 10k 50
BNC
2k
4 2
BNC
BNC
Input
Output
R1 5k R7c 2k R7b 200 R7a 100 R6 5k
4
2
0.1F
1 BNC
MIC912
3 5
1
MIC912
3 5
Output
10k
0.1F
0.1F 50
Input 0.1F
R3 200k R4 250
R5 5k VEE
10F
All resistors 1%
All resistors: 1% metal film VEE
10F
R2 R2 + R 5 + R4 VOUT = VERROR 1 + + R1 R7
100pF VCC
PSRR vs. Frequency
CMRR vs. Frequency
10F
10pF R1 20
R2 4k
R3 27k S1 S2
4
2
0.1F
1 BNC
MIC912
3 5
To Dynamic Analyzer
R5 20
R4 27k
0.1F
10pF VEE
10F
Noise Measurement June 2000 3 MIC912
MIC912
Micrel
Electrical Characteristics
Supply Current vs. Supply Voltage
3.5
SUPPLY CURRENT (mA)
Supply Current vs. Temperature
4.0 OFFSET VOLTAGE (mV) 2.5
Offset Voltage vs. Temperature
VSUPPLY = 5V 2.0
SUPPLY CURRENT (mA)
+85C 3.0 +25C
3.5
VSUPPLY = 9V VSUPPLY = 5V
3.0
2.5
-40C
1.5
VSUPPLY = 9V
2.5
2.0 2
3456789 SUPPLY VOLTAGE (V)
10
2.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
1.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
Bias Current vs. Temperature
5
Offset Voltage vs. Common-Mode Voltage
6 OFFSET VOLTGE (mV) OFFSET VOLTGE (mV) 5 4 +85C 3 -40C 2 1 +25C 0 -8 -6 -4 -2 0 2 4 6 8 COMMON-MODE VOLTAGE (V) VSUPPLY = 9V 4 3 2 1 5
Offset Voltage vs. Common-Mode Voltage
VSUPPLY = 5V
BIAS CURRENT (A)
4 VSUPPLY = 5V
+85C
3
-40C +25C
2
VSUPPLY = 9V
1 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0 -5 -4 -3 -2 -1 0 1 2 3 4 5 COMMON-MODE VOLTAGE (V)
Short-Circuit Current vs. Temperature
95 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 90 85 80 75 70 65 60 55 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) VSUPPLY = 5V SOURCING CURRENT VSUPPLY = 9V -20
Short-Circuit Current vs. Temperature
100
VSUPPLY = 5V
Short-Circuit Current vs. Supply Voltage
OUTPUT CURRENT (mA)
-25
80
-40C +25C
-30 SINKING CURRENT -35 VSUPPLY = 9V -40 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
60 +85C 40 SOURCING CURRENT 20 2 3456789 SUPPLY VOLTAGE (V) 10
Short-Circuit Current vs. Supply Voltage
-15 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) -20 -25 -30 -35 SINKING CURRENT -40 2 +25C 10 -40C +85C 10 9 8 7 6 5 4 3 2 1 0 0
Output Voltage vs. Output Current
OUTPUT VOLTAGE (V) VSUPPLY = 9V 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -40
Output Voltage vs. Output Current
SINKING CURRENT
-40C +25C
+85C
+25C -40C SOURCING CURRENT +85C
VSUPPLY = 9V -30 -20 -10 OUTPUT CURRENT (mA) 0
3456789 SUPPLY VOLTAGE (V)
20 40 60 80 100 OUTPUT CURRENT (mA)
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Output Voltage vs. Output Current
4.5 4.0 OUTPUT VOLTAGE (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 SOURCING CURRENT 20 40 60 80 OUTPUT CURRENT (mA) +85C -40C +25C
OUTPUT VOLTAGE (V) 0
Output Voltage vs. Output Current
-1 -2 -3 -4 -5 -6 -7 -8 +25C SINKING CURRENT -40C
VSUPPLY = 5V
-9 VSUPPLY = 5V +85C -10 -30 -25 -20 -15 -10 -5 OUTPUT CURRENT (mA)
0
Gain Bandwidth and Phase Margin vs. Load
250 50
Gain Bandwidth and Phase Margin vs. Supply Voltage
250 25 20 15 10 5 0 10
Common-Mode Rejection Ratio
120 100
GAIN BANDWIDTH (MHz)
PHASE MARGIN ()
PHASE MARGIN ()
200 150 100 50 0 0 VSUPPLY = 9V
GAIN BANDWIDTH (MHz)
40 30 20 10 0 200 400 600 800 1000 CAPACITIVE LOAD (pF)
200 150 100 50 0 2
CMRR (dB)
80 60 40 20 VSUPPLY = 9V
1x102
1x103
1x104
1x105
1x106 1x106 1x106
3456789 SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
Common-Mode Rejection Ratio
120 100 100 80
Positive Power Supply Rejection Ratio
100 80
Negative Power Supply Rejection Ratio
+PSRR (dB)
60 40 V SUPPLY = 9V 20 0
-PSRR (dB)
CMRR (dB)
80 60 40 20 V SUPPLY = 5V
60 40 VSUPPLY = 9V 20 0
1x102
1x103
1x104
1x105
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
Positive Power Supply Rejection Ratio
100 80
Negative Power Supply Rejection Ratio
100 80
+PSRR (dB)
-PSRR (dB)
60 40 VSUPPLY = 5V 20 0
60 40 VSUPPLY = 5V 20 0
1x102
1x103
1x104
1x105
1x102
1x103
1x104
1x105
1x106
1x107
FREQUENCY (Hz)
FREQUENCY (Hz)
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1x107
1x107
1x102
1x103
1x104
1x105
1x106
1x107
1x102
1x103
1x104
1x105
1x106
1x107
0
1x107
0
MIC912
MIC912
Micrel
Open-Loop Gain
70 60 50
GAIN (dB)
70 60
Open-Loop Frequency Response
315 270 225 180 135 90
50pF 20pF 10pF 0pF
CL =
GAIN (dB)
30 20 10 0 -10 -20
1000pF 500pF 200pF 100pF
30 20 10 0 No Load
45 0 -45 -90
VCC = 5V
1x106
1x105
1x106
1x107
1x108
1x105
1x107
1x108
5x108
FREQUENCY (MHz)
FREQUENCY (MHz)
Open-Loop Gain
70 60 50
GAIN (dB)
70 60
Open-Loop Frequency Response
50pF 20pF 10pF 0pF
CL =
30
500pF 200pF 100pF
20 10 0 -10 -20
1000pF
30 20 10 0 -10 -20 V = 9V CC -30
1x105 1x106
135 90 No Load 45 0 -45 -90
1x107 1x108 5x108
VCC = 9V
1x106
1x105
1x107
1x108
5x108
-135
FREQUENCY (MHz)
FREQUENCY (MHz)
Voltage Noise
120
Positive Slew Rate
250 200 150 100 50 0 0 VCC = 5V 350 300 SLEW RATE (V/s) 250 200 150 100 50 200 400 600 800 1000 LOAD CAPACITANCE (pF) 0 0
Negative Slew Rate
VCC = 5V
nV Hz
100 80 60 40 20
NOISE VOLTAGE
1x101
1x102
1x103
1x104
1x105
0
SLEW RATE (V/s)
200 400 600 800 1000 LOAD CAPACITANCE (pF)
FREQUENCY (Hz)
Current Noise
5
Positive Slew Rate
350 300 SLEW RATE (V/s) 250 200 150 100 50 VCC = 9V 400 350 SLEW RATE (V/s) 300 250 200 150 100 50 200 400 600 800 1000 LOAD CAPACITANCE (pF) 0 0
Negative Slew Rate
VCC = 9V
NOISE CURRENT pA Hz
4 3 2 1 0
1x101
1x102
1x103
1x104
1x105
0 0
200 400 600 800 1000 LOAD CAPACITANCE (pF)
FREQUENCY (Hz)
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PHASE ()
GAIN (dB)
40
50 40
RL = 100
5x108
-10 -20 V = 5V CC -30
-135
315 270 225 180
PHASE ()
40
50 40
RL = 100
MIC912
Micrel
Small-Signal Pulse Response
Small-Signal Pulse Response
INPUT
VCC = 9V AV = 1 CL = 1.7pF RL = 100
INPUT
VCC = 5V AV = 1 CL = 1.7pF RL = 100
OUTPUT
Small-Signal Pulse Response
OUTPUT
Small-Signal Pulse Response
INPUT
VCC = 9V AV = 1 CL = 100pF RL = 100
INPUT
VCC = 5V AV = 1 CL = 100pF RL = 100
OUTPUT
Small-Signal Pulse Response
OUTPUT
Small-Signal Pulse Response
INPUT
VCC = 9V AV = 1 CL = 1000pF RL = 100
INPUT
VCC = 5V AV = 1 CL = 1000pF RL = 100
OUTPUT
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OUTPUT
MIC912
MIC912
Micrel
Large-Signal Pulse Response
VCC = 9V AV = 1 CL = 1.7pF
Large-Signal Pulse Response
VCC = 5V AV = 1 CL = 1.7pF
OUTPUT
V = 4.44V t = 19.0ns
OUTPUT
V = 4.48V t = 20.0ns
Large-Signal Pulse Response
Large-Signal Pulse Response
VCC = 5V AV = 1 CL = 100pF
VCC = 9V AV = 1 CL = 100pF
OUTPUT
OUTPUT
V = 4.68V t = 18.0ns
V = 4.80V t = 21.5ns
Large-Signal Pulse Response
Large-Signal Pulse Response
VCC = 5V AV = 1 CL = 1000pF
VCC = 9V AV = 1 CL = 1000pF
OUTPUT
OUTPUT
V = 4.76V t = 66ns
V = 4.56V t = 80ns
MIC912
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June 2000
MIC912
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 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, 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 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 + - VOUT IOUT
Applications 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 200 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 200 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. 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 (<100) in series with the output. Feedback Resistor Selection Conventional op amp gain configurations and resistor selection apply, the MIC912 is NOT a current feedback device. Resistor values in the range of 1k to 10k are recommended.
(
)
(
)
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
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MIC912
MIC912
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)
MIC912
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June 2000
MIC912
Micrel
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MIC912
MIC912
Micrel
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) 2000 Micrel Incorporated
MIC912
12
June 2000

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