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MIC914
Micrel
MIC914
160MHz Low-Power SOT-23-5 Op Amp
General Description
The MIC914 is a high-speed operational amplifier with a gainbandwidth product of 160MHz. The part is unity gain stable provided its output is loaded with at least 200. It has a very low 1.25mA supply current, and features the IttyBittyTM SOT-23-5 package. Supply voltage range is from 2.5V to 9V, allowing the MIC914 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC914 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 MIC914 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables.
Features
* * * * * * 160MHz gain bandwidth product 1.25mA supply current SOT-23-5 package 160V/s slew rate drives any capacitive load 112dB CMRR
Applications
* * * * * * Video Imaging Ultrasound Portable equipment Line drivers XDSL
Ordering Information
Part Number MIC914BM5 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
A26
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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MIC914
MIC914
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 ............................... 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 0.03 Input Common-Mode Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain CMRR > 60dB -3V < VCM < +3V 5V < VS < 9V RL = 2k, VOUT = 2V RL = 200, VOUT = 1V Maximum Output Voltage Swing 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 IGND Unity Gain-Bandwidth Product -3dB Bandwidth Slew Rate Short-Circuit Output Current source sink Supply Current RL = 1k AV = 2, RL = 470 135 155 135 65 17 1.25 1.8 2.3 +2.8 +2.5 -3.5 80 75 65 65 +3.3 +3.0 110 88 78 78 3.5 -3.5 3.2 -2.5 -1.7 -1.0 -1.7 -3.3 -3.0 Condition Min Typ 1 4 1.5 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
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 Parameter Input Offset Voltage Input Offset Voltage Temperature Coefficient Input Bias Current Condition Min Typ 1 4 1.5 4 8 Max 10 Units mV V/C A A
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MIC914
Symbol IOS VCM CMRR AVOL VOUT Parameter 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 IGND
Note 1. Note 2. Note 3. Note 4. Note 5.
Micrel
Condition Min Typ Max 2 3 +7.5 112 80 +7.4 -7.4 160 185 160 source sink Supply Current
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."
Units A A V dB dB V V
-7.5 80 65 +7.2 +6.8
-7.2 -6.8
V V MHz MHz V/s mA mA
Gain-Bandwidth Product -3dB Bandwidth Slew Rate Short-Circuit Output Current
RL = 1k AV = 2, RL = 470
80 22 1.35 1.9 2.4
mA mA
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MIC914
MIC914
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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
4
2
0.1F
1 BNC
MIC914
3 5
1
MIC914
3 5
Output
10k
0.1F
0.1F 50
5k All resistors 1%
Input 0.1F
R3 200k R4 250
R5 5k VEE
10F
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
10pF R1 20
R2 4k
10F
R3 27k S1 S2
4
2
0.1F
1 BNC
MIC914
3 5
To Dynamic Analyzer
R5 20
R4 27k
0.1F
10pF VEE
10F
Noise Measurement
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MIC914
Micrel
Electrical Characteristics
Supply Current vs. Supply Voltage
2.0 SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
Supply Current vs. Temperature
2.0 1.8 1.6 1.4 1.2 1.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) VSUPPLY = 9V VSUPPLY = 5V OFFSET VOLTAGE (mV) 0.0
Offset Voltage vs. Temperature
+85C 1.5 +25C -40C 1.0
-0.5
VSUPPLY = 5V
-1.0 VSUPPLY = 9V -1.5
0.5 2
3456789 SUPPLY VOLTAGE (V)
10
-2.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
Bias Current vs. Temperature
2.5
Offset Voltage vs. Common-Mode Voltage
-0.25 VSUPPLY = 5V OFFSET VOLTGE (mV) -0.5
Offset Voltage vs. Common-Mode Voltage
VSUPPLY = 9V
2
-0.50
+85C +25C
OFFSET VOLTGE (mV)
BIAS CURRENT (A)
+85C -1.0 +25C -40C
1.5
VSUPPLY = 9V
-0.75 -40C -1.00
1 VSUPPLY = 5V 0.5 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
-1.25 -5 -4 -3 -2 -1 0 1 2 3 4 5 COMMON-MODE VOLTAGE (V)
-1.5 -8 -6 -4 -2 0 2 4 6 8 COMMON-MODE VOLTAGE (V)
Short-Circuit Current vs. Temperature
95 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 90 85 80 75 70 65 60 VSUPPLY = 5V SOURCING CURRENT VSUPPLY = 9V -10
Short-Circuit Current vs. Temperature
100 OUTPUT CURRENT (mA)
Short-Circuit Current vs. Supply Voltage
-15
VSUPPLY = 5V
80 +25C 60 -40C SOURCING CURRENT 20 2 3456789 SUPPLY VOLTAGE (V) 10 +85C
-20 SINKING CURRENT -25 VSUPPLY = 9V -30 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
40
55 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
Short-Circuit Current vs. Supply Voltage
-10 OUTPUT CURRENT (mA) -40C OUTPUT VOLTAGE (V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0
Output Voltage vs. Output Current
0.0
Output Voltage vs. Output Current
OUTPUT VOLTAGE (V) -0.5 -1.0 +25C -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -25 VSUPPLY = 5V -20 -15 -10 -5 OUTPUT CURRENT (mA) 0 +85C SINKING CURRENT -40C
+85C
VSUPPLY = 5V
-15
-40C
-20 +85C SINKING CURRENT -30 2
+25C
+25C SOURCING CURRENT 20 40 60 80 OUTPUT CURRENT (mA)
-25
3456789 SUPPLY VOLTAGE (V)
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Output Voltage vs. Output Current
OUTPUT VOLTAGE (V) +85C OUTPUT VOLTAGE (V) 10 9 8 7 6 5 0 VSUPPLY = 9V
Output Voltage vs. Output Current
GAIN BANDWIDTH (MHz)
Gain Bandwidth and Phase Margin vs. Capacitive Load
150 125 100 75 50 25 0 0 Phase Margin VSUPPLY = 5V 60 50 40 30 20 10
+25C -2 -4 -6 -8 VSUPPLY = 9V +85C
SINKING CURRENT -40C
+25C 4 3 -40C 2 SOURCING 1 CURRENT 0 0 20 40 60 80 100 OUTPUT CURRENT (mA)
Gain Bandwidth
-10 -30
-20 -10 OUTPUT CURRENT (mA)
0
0 200 400 600 800 1000 CAPACITIVE LOAD (pF)
Gain Bandwidth and Phase Margin vs. Capacitive Load
175 70 60
Gain Bandwidth and Phase Margin vs. Supply Voltage
175 35 Gain Bandwidth 30 25 20 Phase Margin 15 10 5 3456789 SUPPLY VOLTAGE (V) 0 10
Common-Mode Rejection Ratio
120 100
GAIN BANDWIDTH (MHz)
150 125 100 75 50 25 0 0 VSUPPLY = 9V Gain Bandwidth Phase Margin
GAIN BANDWIDTH (MHz)
150 125 100 75 50 25 0 2
PHASE MARGIN ()
50 40 30 20 10
PHASE MARGIN ()
CMRR (dB)
80 60 40 20 VSUPPLY = 5V
1x102
1x103
1x104
1x105
1x106
FREQUENCY (Hz)
Positive Power Supply Rejection Ratio
100 80 100 80
Negative Power Supply Rejection Ratio
120 100
Common-Mode Rejection Ratio
+PSRR (dB)
-PSRR (dB)
60 40 VSUPPLY = 5V 20 0
60 40 VSUPPLY = 5V 20 0
CMRR (dB)
80 60 40 20 VSUPPLY = 9V
2
1x103
1x104
1x105
1x106
1x107
2
1x103
1x104
1x105
1x106
1x107
1x102
1x103
1x104
1x105
1x106
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
Positive Power Supply Rejection Ratio
100 80
100 80
Negative Power Supply Rejection Ratio
10 8 6 4 2 0
Closed-Loop Frequency Response
1000pF 50pF 500pF 200pF 0pF 100pF
+PSRR (dB)
-PSRR (dB)
60 40 VSUPPLY = 9V 20 0
60 40 VSUPPLY = 9V 20 0
GAIN (dB)
1x103
1x104
1x105
1x106
1x107
1x103
1x104
1x105
1x106
FREQUENCY (Hz)
FREQUENCY (Hz)
MIC914
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1x107
1x10
1x10
-2 -4 -6 VSUPPLY = 2.5V -8 AV = 1 -10 1 10 100 200 FREQUENCY (MHz)
2
2
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1x107
0
1x10
1x10
1x107
0 200 400 600 800 1000 CAPACITIVE LOAD (pF)
0
PHASE MARGIN ()
MIC914
Micrel
Closed-Loop Frequency Response
10 8 6 4 2 0 -2 -4 -6 -8 -10 1 9V GAIN 180 135 90 45 0 -45
Open-Loop Frequency Response vs. Capacitive Load
10 8 6 4 2 0 1000pF 470pF 200pF 100pF 50pF 0pF GAIN (dB)
Open-Loop Frequency Response vs. Capacitive Load
10 8 6 4 2 0 1000pF 470pF 200pF 100pF 50pF 0pF
PHASE ()
GAIN (dB)
5V PHASE 2.5V
GAIN (dB)
-90 -135 -180 -225 -270 10 100 200 FREQUENCY (MHz)
-2 -4 -6 VSUPPLY = 5V -8 -10 1 10 100 200 FREQUENCY (MHz)
-2 -4 -6 VSUPPLY = 9V -8 -10 1 10 100 200 FREQUENCY (MHz)
Open-Loop Frequency Response
50 40 30 20 10 0 RL = 100 225 180 135 90 45 0 50 40 30 20 10 0
Open-Loop Frequency Response
RL = 100 225 180 135 90 45 0
Closed-Loop Frequency Response Test Circuit
VCC 10F
-10 -45 No Load -20 -90 -30 -135 -40 VSUPPLY = 5V -180 -50 -225 1 10 100 200 FREQUENCY (MHz)
-10 -45 -20 -90 No Load -30 -135 -40 VSUPPLY = 9V -180 -50 -225 1 10 100 200 FREQUENCY (MHz)
PHASE ()
PHASE ()
GAIN (dB)
GAIN (dB)
0.1F
FET probe MIC914 RF 50 10F VEE CL
Positive Slew Rate
150 125 SLEW RATE (V/s) SLEW RATE (V/s) 100 75 50 25 0 0 200 400 600 800 1000 LOAD CAPACITANCE (pF) VCC = 5V 150 125 100 75 50 25 0 0
Negative Slew Rate
150 125 VCC = 5V SLEW RATE (V/s) 100 75 50 25 200 400 600 800 1000 LOAD CAPACITANCE (pF) 0 0
Positive Slew Rate
VCC = 9V
200 400 600 800 1000 LOAD CAPACITANCE (pF)
Negative Slew Rate
150
nV Hz
Voltage Noise
250 7
Current Noise
NOISE CURRENT pA Hz
6 5 4 3 2 1
125 SLEW RATE (V/s) 100 75 50 25 0 0
VCC = 9V
200 150 100 50 0
NOISE VOLTAGE
1x101
1x102
1x103
1x104
1x105
1x101
1x102
1x103
1x104
200 400 600 800 1000 LOAD CAPACITANCE (pF)
FREQUENCY (Hz)
FREQUENCY (Hz)
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1x105
0
MIC914
MIC914
Micrel
Small-Signal Pulse Response
VCC = 5V AV = 1 CL = 1.7pF VCC = 9V AV = 1 CL = 1.7pF
Small-Signal Pulse Response
INPUT
OUTPUT
Small-Signal Pulse Response
VCC = 5V AV = 1 CL = 100pF VCC = 9V AV = 1 CL = 1000pF
OUTPUT
INPUT
Small-Signal Pulse Response
INPUT
OUTPUT
Small-Signal Pulse Response
VCC = 5V AV = 1 CL = 100pF VCC = 9V AV = 1 CL = 1000pF
OUTPUT
INPUT
Small-Signal Pulse Response
INPUT
OUTPUT
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OUTPUT
INPUT
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Large-Signal Pulse Response
VCC = 5V AV = -1 CL = 1.7pF RL = 470
Large-Signal Pulse Response
OUTPUT
V = 5.28V t = 50ns
OUTPUT
V = 5.52V t = 56ns
VCC = 5V AV = -1 CL = 100pF RL = 470
Large-Signal Pulse Response
VCC = 5V AV = -1 CL = 100pF RL = 470 V = 5.24V t = 115ns
Large-Signal Pulse Response
VCC = 9V AV = -1 CL = 100pF RL = 470M
OUTPUT
OUTPUT
V = 5.08V t = 38ns
Large-Signal Pulse Response
VCC = 9V AV = -1 CL = 1000pF RL = 470M
Large-Signal Pulse Response
VCC = 9V AV = -1 CL = 1000pF RL = 470M
OUTPUT
OUTPUT
V = 5.48V t = 44ns
V = 6.40V t = 115ns
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MIC914
MIC914
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 MIC914 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 MIC914 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 MIC914 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 MIC911, a more heavily compensated version of the MIC914 which provides extremely stable operation for all load resistance and capacitance. For stability considerations at different supply voltages, please refer to the graph elsewhere in the datasheet entitled "Gain Bandwidth and Phase Margin vs. Supply Voltage". Driving High Capacitance The MIC914 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 MIC914 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.
(
)
(
)
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
MIC914
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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)
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MIC914
MIC914
Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL
+ 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
MIC914
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June 2000

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