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MIC920
Micrel, Inc.
MIC920
80MHz Low-Power SC-70 Op Amp
General Description
The MIC920 is a high-speed operational amplifier with a gain-bandwidth product of 80MHz. The part is unity gain stable. It has a very low 550A supply current, and features the SC-70 package. Supply voltage range is from 2.5V to 9V, allowing the MIC920 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC920 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 MIC920 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables.
Features
* * * * * * * 80MHz gain bandwidth product 115MHz -3dB bandwidth 550A supply current SC-70 or SOT-23-5 packages 3000V/s slew rate Drives any capacitive load Unity gain stable
Applications
* * * * * Video Imaging Ultrasound Portable equipment Line drivers
Ordering Information
Part Number Standard MIC920BM5 MIC920BC5 Marking A37 A37 MIC920YC5 A37 Pb-Free Marking Ambient Temperature -40C to +85C -40C to +85C Package SOT-23-5* SC-70-5
* Contact factory for availability of SOT-23-5 package. Note: Underbar marking may not be to scale.
Pin Configuration
IN- V- IN+
3
Functional Pinout
Part Identification
IN-
3
V- IN+
2
1
2
1
A37
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. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
March 2006
1
MIC920
MIC920
Micrel, Inc.
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)
Symbol VOS VOS IB IOS V+ = +5V, V- = -5V, VCM = 0V, RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted. Parameter Condition Min 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 Maximum Output Voltage Swing CMRR > 72dB 3.5V < VS < 9V -2.5V < VCM < +2.5V RL = 2k, VOUT = 2V positive, RL = 2k -3.25 75 95 65 +3.0 +1.5 85 104 82 85 3.6 -3.6 3.0 -2.5 67 32 100 1350 45 20 63 45 0.55 11 0.7 0.80 -1.0 -3.0 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 V/Hz A/Hz
VCM
CMRR
PSRR AVOL VOUT
RL = 100, VOUT = 1V negative, RL = 2k
positive, RL = 200 GBW PM BW SR ISC IS Unity Gain-Bandwidth Product Phase Margin -3dB Bandwidth Slew Rate Short-Circuit Output Current Supply Current Input Voltage Noise Input Current Noise CL = 1.7pF
negative, RL = 200, Note 5
C=1.7pF, Gain=1, VOUT=5V, peak to peak, positive SR = 1190V/s source sink No Load f = 10kHz f = 10kHz
Av = 1, RL = 1k, CL = 1.7pF
Electrical Characteristics
Symbol VOS VOS IB V+ = +9V, V- = -9V, VCM = 0V, RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Parameter Condition Min 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 3.5V < VS < 9V -6.5V < VCM < +6.5V -7.25 60 95 91 104 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
IOS
VCM
CMRR
PSRR
MIC920
2
March 2006
MIC920
Symbol AVOL VOUT GBW PM BW SR ISC IS Parameter Large-Signal Voltage Gain Maximum Output Voltage Swing Unity Gain-Bandwidth Product Phase Margin -3dB Bandwidth Slew Rate Short-Circuit Output Current Supply Current Input Voltage Noise Input Current Noise
Note 1. Note 2. Note 3. Note 4. Note 5.
Micrel, Inc.
Condition RL = 2k, VOUT = 2V positive, RL = 2k RL = 100, VOUT = 1V Min 75 6.5 Typ 84 93 7.5 -7.5 80 30 115 3000 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 V/Hz A/Hz
CL = 1.7pF
negative, RL = 2k
C=1.7pF, Gain=1, VOUT=5V, peak to peak, negative SR = 2500V/s source sink No Load f = 10kHz f = 10kHz
AV = 1, RL = 1k, CL = 1.7pF
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."
March 2006
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MIC920
MIC920
Micrel, Inc.
V+
10F
V+
Test Circuits
Input
BNC
50
0.1F 10k
3
0.1F
R2 5k
10F
2k
5
10k
10k
1
MIC920
2
4
BNC
Input
BNC
R1 5k
R7c 2k R7b 200 R7a 100
3
5
0.1F
4 BNC
Output
1
MIC920
2
Output
50
0.1F
R6 5k R3 200k R4 250 R5 5k
10F
Input
BNC
0.1F
50
0.1F
All resistors 1%
V-
All resistors: 1% metal film
10F
V-
R2 R2 + R 5 + R4 VOUT = VERROR 1 + + R1 R7
PSRR vs. Frequency
CMRR vs. Frequency
100pF
R2 4k
V+
10F
3
V+
10F
10pF
R1 20
R3 27k
S1 S2
5
0.1F
4
3
5
0.1F
4 BNC
1
MIC920
2
R5 20
R4 27k
10pF
0.1F
To Dynamic Analyzer
VIN
1
MIC920
2
300
VOUT FET Probe
0.1F
50
1k
CL
10F
10F
V-
V-
Noise Measurement
Closed Loop Frequency Response Measurement
MIC920
4
March 2006
MIC920
Micrel, Inc.
Typical Characteristics
Offset Voltage vs. Temperature
V = 2.5V
1.25 OFFSET VOLTAGE (mV) 1.2
0.60
SUPPLY CURRENT (mA)
Supply Current vs. Temperature
V = 9V V = 5V V = 2.5V
1.15 1.1 V = 5V V = 9V
0.50 0.45 0.40 0.35
SUPPLY CURRENT (mA)
0.55
1.05 1
0.95 0.9 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
0.30 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
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
Supply Current vs. Supply Voltage
+85C +25C -40C 3.8 5.1 6.4 7.7 SUPPLY VOLTAGE (V) 9
-3.40 -2.72 -2.04 -1.36 -0.68 0 0.68 1.36 2.04 2.72 3.40
COMMON-MODE VOLTAGE (V)
84 80 76 72 68 64 60 56 52 48 44 40 2.0
Short-Circuit Current vs. Supply Voltage (Sourcing)
-40C 25C 85C
3.4 4.8 6.2 7.6 9.0 SUPPLY VOLTAGE (V)
17 20 23 26 29 32 35 38 25C 85C 41 44 47 -40C 50 2.0 3.4 4.8 6.2 7.6 9.0 SUPPLY VOLTAGE (V)
Short-Circuit Current vs. Supply Voltage (Sinking)
SHORT-CIRCUIT CURRENT (mA)
SHORT-CIRCUIT CURRENT (mA)
45.0 40.5 36.0 31.5 27.0 22.5 18.0 13.5 9.0 4.5 0
0 -8 -16 -24 -32 -40 -48 -56 -64 -72 -80
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
March 2006
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50 45 40 35 30 25 20 15 10 5 0
0.5 85C 0 -0.5 -1.0 -1.5 -2.0 25C -2.5 -3.0 -3.5 -4.0 -4.5 -5.0
Output Voltage vs. Output Current (Sinking)
V = 5V
-40C
11 10 9 8 7 6 5 4 3 2 1 0
Output Voltage vs. Output Current (Sourcing)
V = 9V
-40C
25C
85C
1 25C 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10
OUTPUT VOLTAGE (V)
OUTOUT VOLTAGE (V)
OUTOUT VOLTAGE (V)
0 -8 -16 -24 -32 -40 -48 -56 -64 -72 -80
5.5 5.0 4.5 4.0 85C 3.5 3.0 2.5 -40C 2.0 1.5 1.0 0.5 0
OUTPUT VOLTAGE (V)
-7.40 -5.92 -4.44 -2.96 -1.48 0 1.48 2.96 4.44 5.92 7.40
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)
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
Offset Voltage vs. Common-Mode Voltage
V = 5V
-40C +25C +85C
2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0
Offset Voltage vs. Common-Mode Voltage
V = 9V
OFFSET VOLTAGE (mV)
OFFSET VOLTAGE (mV)
OFFSET VOLTAGE (mV)
-40C +25C +85C
COMMON-MODE VOLTAGE (V)
Output Voltage vs. Output Current (Sourcing)
V = 5V
25C
OUTPUT CURRENT (mA)
Output Voltage vs. Output Current (Sinking)
V = 9V 85C
-40C
OUTPUT CURRENT (mA)
MIC920
MIC920
Micrel, Inc.
0.35 BIAS CURRENT (A) 0.30 0.25 0.20 0.15 0.10 0.05
Bias Current vs. Temperature
9V
0.00 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
GAIN (dB)
GAIN (dB)
5V
25 20 15 10 5 9.0V 0 -5 5.0V -10 2.5V -15 Av = -1 -20 R+ = R = 475 I -25 1E+6 10E+6 100E+6 200E+6 1M 100M 10M FREQUENCY (Hz)
Closed-Loop Frequency Response
25 20 15 10 5 9.0V 0 5.0V -5 2.5V -10 -15 Av = 2 R = RI = 475 -20 F -25 1E+6 10E+6 100E+6 200E+6 1M 100M 10M FREQUENCY (Hz)
Closed-Loop Frequency Response
50 40 30 20 10 400pF 200pF 0 0 100pF -10 1000pF 800pF -20 600pF -30 V = 5V -40 Av = 1 -50 1E+6 10E+6 100E+6 200E+6 100M 1M 10M FREQUENCY (Hz)
Closed-Loop Gain vs. Frequency
50 40 30 20 1.7pF 10 200pF 0 100pF -10 1000pF 800pF -20 600pF 400pF -30 V = 9V -40 Av = 1 -50 1E+6 1E+7 1E+8 E+8 2 10M 1M 100M FREQUENCY (Hz)
Closed-Loop Gain vs. Frequency
50 V = 5V 40 30 20 121pF 50pF 10 1.7pF 0 1000pF 471pF -10 200pF -20 -30 -40 -50 10M 100M 1M 10x106 100x106 6 200x10 1x106 FREQUENCY (Hz)
Open-Loop Gain vs. Frequency
CLOSED-LOOP GAIN (dB)
CLOSED-LOOP GAIN (dB)
OPEN-LOOP GAIN (dB)
50 V = 9V 40 30 20 121pF 50pF 10 1.7pF 0 1000pF 471pF -10 200pF -20 -30 -40 -50 10M 100M 1M 1x106 10x106 100x106 6 200x10 FREQUENCY (Hz)
Open-Loop Gain vs. Frequency
85 GAIN BANDWIDTH (MHz) 80 75 70 65 60 55
Gain Bandwidth and Phase Margin vs. Supply Voltage
Phase Margin
37 PHASE MARGIN () 35 33 31 29 27
70 GAIN BANDWIDTH (MHz) 60 50 40 30 20 10
Gain Bandwidth and Phase Margin vs. Load
V = 5V
50 PHASE MARGIN () 45
OPEN-LOOP GAIN (dB)
Phase Margin
40 35 30 25
Gain Bandwidth
Gain Bandwidth 25 50 0 1 2 3 4 5 6 7 8 9 10 SUPPLY VOLTAGE V) (
0 0
20 200 400 600 800 1000 CAPACITIVE LOAD (pF)
90
Gain Bandwidth and Phase Margin vs. Load
V = 9V
55
G A IN B A N D W ID T H (d B )
100 80 60 40 20 0 -20 -40 -60 -80
Open-Loop Frequency Response
V = 5V
100 No Load Gain 100
225 135
GAIN BANDWIDTH (MHz)
PHASE MARGIN ()
60 50 40 30 20 10 0 0
45 Phase Margin 40 35 Gain Bandwidth 30 25
Phase 90
45 0 -45 -90
-135 -180 -225 1M 10M 100M CAPACITIVE LOAD (pF)
20 200 400 600 800 1000 CAPACITIVE LOAD (pF)
-100 100k
MIC920
6
PHASE M ARG IN ()
March 2006
PHASE MARGIN ()
70
GAIN BANDWIDTH (dB)
80
50
180
100 80 60 40 20 0 -20 -40 -60 -80 -100 100k
Open-Loop Frequency Response
V = 9V
225 180 100 135 Phase 90 No Load 45 0 Gain 100 -45 -90 -135 -180 -225 1M 10M 100M CAPACITIVE LOAD (pF)
MIC920
Micrel, Inc.
120 100 PSRR (dB) 80 60 40 20 0 0.1 1
Positive PSRR vs. Frequency
V = 5V
120 100
PSRR (dB)
Negative PSRR vs. Frequency
V = 5V
120 100
PSRR (dB)
Positive PSRR vs. Frequency
V = 9V
80 60 40 20
80 60 40 20
10 100 1k FREQUENCY (kHz)
10k
0 0.1
1
10 100 1k FREQUENCY (kHz)
10k
0 0.1
1
10 100 1k FREQUENCY (kHz)
10k
120 100 PSRR (dB) 80 60 40 20 0 0.1
Negative PSRR vs. Frequency
V = 9V
1
10 100 1k FREQUENCY (kHz)
10k
100 90 80 70 60 50 40 30 20 10 0 100x100 100
Common-Mode Rejection Ratio
V = 5V
1x103 1k
10x103 100x103 1x106 10x106 10k 100k 1M 10M FREQUENCY (Hz)
100 90 80 70 60 50 40 30 20 10 0 100x100 100
Common-Mode Rejection Ratio
V = 9V
CMRR (dB)
CMRR (dB)
1x103 1k
10x103 100x103 1x106 10x106 10k 100k 1M 10M FREQUENCY (Hz)
1400 1200
Positive Slew Rate
V = 5V
1200 SLEW RATE (V/s) 1000 800 600 400 200 0 0
Negative Slew Rate
V = 5V
3500 3000 SLEW RATE (V/s) 2500 2000 1500 1000 500
Positive Slew Rate
V = 9V
SLEW RATE (V/s)
1000 800 600 400 200 0 0 200 400 600 800 1000 LOAD CAPACITANCE (pF)
200 400 600 800 1000 LOAD CAPACITANCE (pF)
0 0
200 400 600 800 1000 LOAD CAPACITANCE (pF)
3000
Negative Slew Rate
V = 9V
70 NOISE VOLTAGE (nV/Hz1/2) 60 50 40 30 20 10 0 10
Voltage Noise Density vs. Frequency
2.5 NOISE CURRENT (pA/Hz1/2) 2.0 1.5 1.0 0.5 0 10
Current Noise Density vs. Frequency
SLEW RATE (V/s)
2500 2000 1500 1000 500 0 0 200 400 600 800 1000 LOAD CAPACITANCE (pF)
100 1000 10000 100000 FREQUENCY (Hz)
100 1000 10000 100000 FREQUENCY (Hz)
March 2006
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MIC920
MIC920
Micrel, Inc.
Functional Characteristics
Small Signal Response
Small Signal Response
INPUT (50mV/div)
OUTPUT (50mV/div)
TIME (100ns/div)
OUTPUT (50mV/div)
INPUT (50mV/div)
VCC = 9.0V CL = 1.7F Av = 1.0V/V
VCC = 5.0V CL = 1.7F Av = 1.0V/V
TIME (100ns/div)
Small Signal Response
Small Signal Response
INPUT (50mV/div)
OUTPUT (50mV/div)
OUTPUT (50mV/div)
INPUT (50mV/div)
VCC = 9.0V CL = 100pF Av = +1
VCC = 5.0V CL = 100pF Av = +1V/V
TIME (100ns/div)
TIME (100ns/div)
Small Signal Response
Small Signal Response
INPUT (50mV/div)
INPUT (50mV/div)
VCC = 9.0V CL = 1000pF Av = +1V/V
VCC = 5.0V CL = 1000pF Av = +1V/V
OUTPUT (50mV/div)
TIME (100ns/div)
OUTPUT (50mV/div)
TIME (100ns/div)
MIC920
8
March 2006
MIC920
Micrel, Inc.
Large Signal Response
V = 5V CL = 1.7pF Av = 1 Positive SR = 1350V/sec Negative SR = 1190V/sec
Large Signal Response
OUTPUT (2V/div)
OUTPUT (2V/div)
V = 9V CL = 1.7pF Av = 1 Positive SR = 3000V/sec Negative SR = 2500V/sec TIME (10ns/div) TIME (10ns/div)
Large Signal Reponse
V = 5V CL = 100pF Av = 1 Positive SR = 373V/sec Negative SR = 290V/sec OUTPUT (2V/div)
Large Signal Response
OUTPUT (2V/div)
V = 9V CL = 100pF Av = 1 Positive SR = 672V/sec Negative SR = 424V/sec TIME (50ns/div) TIME (50ns/div)
Large Signal Response
V = 5V CL = 1000pF Av = 1 Positive SR = 75V/sec Negative SR = 41V/sec OUTPUT (2V/div)
Large Signal Response
Output (2V/div)
V = 9V CL = 1000pF Av = 1 Positive SR = 97V/sec Negative SR = 60V/sec TIME (100ns/div) TIME (100ns/div)
March 2006
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MIC920
MIC920
Micrel, Inc. 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 resis-tance). Surface-mount ceramic capacitors are ideal. Thermal Considerations The SC70-5 package and the SOT-23-5 package, like all small packages, have 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 par-ticular CMRR will reduce. An MIC920 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) 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 450C/W. TJ(max) - TA(max) Max. Allowable Power Dissipation = 450C/W
Applications Information
The MIC920 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 MIC920 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 (<100) in series with the output. Feedback Resistor Selection Conventional op amp gain configurations and resistor selection apply, the MIC920 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, 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. It is important to ensure adequate supply bypassing capacitors are located close to the device.
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MIC920
10
March 2006
MIC920
Micrel, Inc.
Package Information
SOT-23-5 (M5)
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. (c) 2001 Micrel, Inc.
March 2006
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MIC920

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