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MIC922
Micrel, Inc.
MIC922
230MHz Low-Power SC-70 Op Amp
General Description
The MIC922 is a high-speed operational amplifier with a gain-bandwidth product of 230MHz. The part is unity gain stable. It has a very low 2.5mA supply current, and features the TeenyTM SC-70 package. Supply voltage range is from 2.5V to 9V, allowing the MIC922 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC922 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 MIC922 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables.
Features
* * * * * * * 230MHz gain bandwidth product 400MHz -3dB bandwidth 2.5mA supply current SC-70 package 1500V/s slew rate Drives any capacitive load Unity gain stable
Applications
* * * * * Video Imaging Ultrasound Portable equipment Line drivers
Ordering Information
Part Number Standard MIC922BC5 Marking A39 Pb-Free MIC922YC5 Marking A39 Ambient Temperature -40C to +85C Package SC-70-5
Pin Configuration
IN- V- IN+
3
Functional Pinout
2
1
A39
4 5
Part Identification
IN-
3
V- IN+
2
1
4
5
OUT
V+
OUT
V+
SC-70
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)
Teeny is a trademark of Micrel, Inc. Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-100 * http://www.micrel.com
May 2006
1
MIC922
MIC922
Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+ - VV-) ........................................... 20V Differential 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 SC-70-5 (JA)..................................................... 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 -5 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 3.5V < VS < 9V -2.5V < VCM < +2.5V RL = 2k, VOUT = 2V positive, RL = 2k -2 -3.25 75 68 65 +3 +2.7 80 87 74 77 3.6 -3.6 3.0 -2.6 200 49 320 420 65 40 78 47 2.5 9 1.1 3 -2.3 -3 Typ 0.8 15 1.7 0.3 4.5 2 +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 = 100 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 CL = 1.7pF
negative, RL = 100, Note 5
C=1.7pF, Gain=1, VOUT=4VPP negative SR = 360V/s source sink No Load f = 10kHz f = 10kHz
Av = 1, 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 -5 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 3.5V < VS < 9V -6.5V < VCM < +6.5V -7.25 58 68 83 87 Typ 0.4 15 1.7 0.3 4.5 2 +7.25 Max 5 Units mV V/C A A V dB dB
IOS
VCM
CMRR
PSRR
MIC922
2
May 2006
MIC922
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 = 100, VOUT = 1V negative, RL = 2k CL = 1.7pF positive, RL = 2k RL = 2k, VOUT = 3V Min 65 7 Typ 76 86 7.5 -7.5 230 44 400 1500 70 40 84 50 2.5 9 1.1 3 -7 Max Units dB dB V V MHz MHz V/s mA mA mA nV/Hz pA/Hz
CL = 1.7pF
C=1.7pF, Av =1, VOUT=8VPP, positive SR = 750V/s source sink No Load f = 10kHz f = 10kHz
AV = 1, 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."
May 2006
3
MIC922
MIC922
Micrel, Inc.
V+
10F
Test Circuits
Input
BNC
50
0.1F 10k
3
0.1F
V+
R2 5k
10F
2k
5
10k
10k
1
MIC922
2
4
BNC
Output
Input
BNC
R1 5k
R7c 2k R7b 200 R7a 100
3
5
0.1F
4 BNC
1
MIC922
2
Output
50
0.1F
Input
BNC
0.1F
R6 5k R3 200k R4 250 R5 5k
10F
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
3
5
0.1F
4 BNC
5
0.1F
4
1
MIC922
2
R5 20
R4 27k
10pF
0.1F
To Dynamic Analyzer
VIN
1
MIC922
2
300
VOUT FET Probe
0.1F
50
CL
10F
10F
V-
V-
Noise Measurement
Closed Loop Frequency Response Measurement
MIC922
4
May 2006
MIC922
Micrel, Inc.
Typical Characteristics
Supply Current vs. Temperature
V = 9V
2.70 SUPPLY CURRENT (mA) 2.65 2.60 2.55 2.50 2.45 2.40 2.35 2.30
2.60 SUPPLY CURRENT (mA) 2.55 2.50 2.45 2.40 2.35 2.30
Supply Current vs. Supply Voltage
-40C 25C
1.4 OFFSET VOLTAGE (mV) 1.2 1
Offset Voltage vs. Temperature
V = 2.5V
0.8 0.6 0.4 0.2 V = 5V V = 9V
V = 5V
85C
V = 2.5V
2.25 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
2.25 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 SUPPLY VOLTAGE (V)
0 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
8 7 V = 5V 25C 6 5 4 -40C 3 2 1 0 85C -1 -2 -3 -5 -4 -3 -2 -1 0 1 2 3 4 5 COMMON-MODE VOLTAGE (V)
Offset Voltage vs. Common-Mode Voltage
OFFSET VOLTAGE (mV)
-9.0 -7.2 -5.4 -3.6 -1.8 0 1.8 3.6 5.4 7.2 9.0
8 7 6 5 4 3 2 1 0 -1 -2 -3
Offset Voltage vs. Common-Mode Voltage
V = 9V
25C
-40C
85C
COMMON-MODE VOLTAGE (V)
5.5 5.0 Sourcing V = 5V 4.5 4.0 3.5 3.0 2.5 -40C 2.0 1.5 85C 1.0 0.5 25C 0 0 10 20 30 40 50 60 70 80 OUTPUT CURRENT (mA)
Output Voltage vs. Output Current
OFFSET VOLTAGE (mV)
OUTPTU VOLTAGE (V)
9.9 9.0 Sourcing V = 9V 8.1 7.2 6.3 -40C 5.4 4.5 3.6 2.7 +25C 1.8 +85C 0.9 0 0 10 20 30 40 50 60 70 80 90 OUTPUT CURRENT (mA)
Output Voltage vs. Output Current
0.5 Sinking 0 V = 5V -0.5 -1.0 -1.5 -2.0 -40C -2.5 25C -3.0 -3.5 -4.0 85C -4.5 -5.0 -50-45-40-35-30-25-20-15-10 -5 0 OUTPUT CURRENT (mA)
Output Voltage vs. Output Current
0.9 Sinking 0.0 V = 9V -0.9 -1.8 25C -2.7 -3.6 -4.5 -5.4 -40C -6.3 -7.2 -8.1 85C -9.0 -60-54-48-42-36-30-24-18-12 -6 0 OUTPUT CURRENT (mA)
Output Voltage vs. Output Current
2.0 2.7 3.4 4.1 4.8 5.5 6.2 6.9 7.6 8.3 9.0
SUPPLY VOLTAGE V) (
May 2006
2.0 2.7 3.4 4.1 4.8 5.5 6.2 6.9 7.6 8.3 9.0
99 90 Sourcing 81 72 63 54 45 36 27 18 9 0
Short-Circuit Current vs. Supply Voltage
-40C 85C 25C
OUTPUT VOLTAGE (V)
6 0 -6 -12 -18 -24 -30 -36 -42 -48 -54 -60
Short Circuit Current vs. Supply Voltage
INPUT BIAS CURRENT (A)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
SHORT-CIRCUIT CURRENT (mA)
NOISE VOLTAGE (nV/HZ)
Sinking
3 2.5 2
Bias Current vs. Temperature
25C 85C
V = 2.5V V = 5V V = 9V
1.5 1
-40C SUPPLY VOLTAGE V) (
0.5
0 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
5
MIC922
MIC922
Micrel, Inc.
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0
4.4 4.0 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0
Bias Current vs. Supply Voltage
GAIN BANDWIDTH (MHz)
-40C 25C
85C
SUPPLY VOLTAGE V) (
60 50 Phase Margin RL = 100 40 No Load 30 20 10 Gain Bandwidth 0 RL = 100 -10 -20 -30 V = 9V -40 100M 10M 1M CAPACITIVE LOAD (pF)
Open-Loop Frequency Response
180 135 90 45 0 -45 -90 -135 -180 -225 -270
60 RL = 100 50 Phase 40 No Load 30 20 Gain 10 0 RL = 100 -10 -20 -30 V = 5V -40 100M 10M 1M CAPACITIVE LOAD (pF)
Open-Loop Frequency Response
180 135 90 45 0 -45 -90 -135 -180 -225 -270
GAIN BANDWIDTH (MHz)
BIAS CURRENT (V)
PHASE MARGIN ()
250
GAIN BANDWIDTH (MHz)
Gain Bandwidth and Phase Margin vs. Load
V = 9V Phase Margin 60 55 50 45 Gain Bandwidth 40
250
GAIN BANDWIDTH (MHz)
Gain Bandwidth and Phase Margin vs. Load
50 45 40 Gain Bandwidth 35
GAIN BANDWIDTH (MHz)
V = 5V Phase Margin
55
240 230
PHASE MARGIN ()
150 100 50 0 0
150 100 50 0 0
35 200 400 600 800 1000 LOAD CAPACITANCE (pF)
30 200 400 600 800 1000 LOAD CAPACITANCE (pF)
800
Positive Slew Rate
V = 9V
1400 1200
SLEW RATE (V/s)
Negative Slew Rate
V = 9V
PHASE MARGIN ()
450 400
Positive Slew Rate
V = 5V
POSITIVE SLEW RATE (V/s)
700 600 500 400 300 200 100 0
1000 800 600 400 200
0 100 200 300 400 500 600 700 800 900 1000
SLEW RATE (V/s)
350 300 250 200 150 100 50 0
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
400 350 SLEW RATE (V/s) 300 250 200 150 100 50 0 0
Negative Slew Rate
V = 5V
200 400 600 800 1000 LOAD CAPACITANCE (pF)
100 90 80 70 60 50 40 30 20 10 0 1x106 1M
Closed Loop Gain vs. Frequency
CLOSED-LOOP GAIN (dB) V = 5V
1.7pF 220pF 100pF 1000pF 800pF 600pF
10x106 100x106 100M 10M FREQUENCY (Hz)
500x106
30 20 10 0 -10 -20 -30 -40 -50 -60 -70 6 1x10 1M
CLOSED-LOOP GAIN (dB)
MIC922
6
0 100 200 300 400 500 600 700 800 900 1000
LOAD CAPACITANCE (pF)
0 100 200 300 400 500 600 700 800 900 1000
0
Closed-Loop Gain vs. Frequency
V = 9V
1.7pF
100pF 1000pF 800pF 220pF 400pF 600pF
10x106 100x106 100M 10M FREQUENCY (Hz)
500x106
May 2006
PHASE MARGIN ()
200
200
50 49 Phase Margin 48 220 47 210 Gain Bandwidth 46 200 45 190 44 180 43 170 42 160 41 40 150 0 1 2 3 4 5 6 7 8 9 10 SUPPLY VOLTAGE V) (
Gain Bandwidth and Phase Margin vs. Supply Voltage
PHASE MARGIN ()
MIC922
Micrel, Inc.
60 50 40 30 20 10 0 -10 -20 -30 -40 1M
Open-Loop Gain vs. Frequency
V = 5V
1.7pF 50pF
100pF 225pF
1000pF 675pF 450pF
10M 100M FREQUENCY (Hz)
60 50 40 30 20 10 0 -10 -20 -30 -40 1M
Open-Loop Gain vs. Frequency
V = 9V
OPEN-LOOP GAIN (dB)
OPEN-LOOP GAIN (dB)
1.7pF 50pF 100pF 225pF
450pF 675pF 1000pF
100M 10M FREQUENCY (Hz)
May 2006
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MIC922
MIC922
Micrel, Inc.
Functional Characteristics
Small Signal Response
Small Signal Response
INPUT (50mV/div)
V = 5.0V Av = 1 CL = 1.7F RL = 1M
INPUT (50mV/div)
V = 9.0V Av = 1 CL = 1.7F RL = 1M
OUTPUT (50mV/div)
TIME (100ns/div)
OUTPUT (50mV/div)
TIME (100ns/div)
Small Signal Response
Small Signal Response
INPUT (50mV/div)
INPUT (50mV/div)
V = 5.0V Av = 1 CL = 100pF RL = 1M
V = 9.0V Av = 1 CL = 100pF RL = 1M
OUTPUT (50mV/div)
TIME (100ns/div)
OUTPUT (50mV/div)
TIME (100ns/div)
Small Signal Response
Small Signal Response
INPUT (50mV/div)
INPUT (50mV/div)
V = 5.0V Av = 1 CL = 1000pF RL = 1M
V = 9.0V Av = 1 CL = 1000pF RL = 1M
OUTPUT (50mV/div)
TIME (100ns/div)
OUTPUT (50mV/div)
TIME (100ns/div)
MIC922
8
May 2006
MIC922
Micrel, Inc.
Large Signal Response
Large Signal Response
OUTPUT (1V/div)
V = 5.0V Av = 1 CL = 1.7F RL = 1M Positive Slew Rate = 418V/s Negative Slew Rate = 356V/s TIME (25ns/div)
OUTPUT (2V/div)
V = 9.0V Av = 1 CL = 1.7F RL = 1M Positive Slew Rate = 747V/s Negative Slew Rate = 1320V/s TIME (25ns/div)
Large Signal Response
Large Signal Response
OUTPUT (1V/div)
V = 5.0V Av = 1 CL = 100pF RL = 1M Positive Slew Rate = 350V/s Negative Slew Rate = 303V/s TIME (25ns/div)
OUTPUT (2V/div)
V = 9.0V Av = 1 CL = 100pF RL = 1M Positive Slew Rate = 274V/s Negative Slew Rate = 274V/s TIME (25ns/div)
Large Signal Response
Large Signal Response
OUTPUT (2V/div)
OUTPUT (1V/div)
V = 5.0V Av = 1 CL = 1000pF RL = 1M Positive Slew Rate = 106V/s Negative Slew Rate = 66V/s TIME (250ns/div)
V = 9.0V Av = 1 CL = 1000pF RL = 1M Positive Slew Rate = 78V/s Negative Slew Rate = 51V/s TIME (250ns/div)
May 2006
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MIC922
MIC922
Micrel, Inc. 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 resis-tance). Surface-mount ceramic capacitors are ideal. Thermal Considerations The SC70-5 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 par-ticular CMRR will reduce. An MIC922 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+ - VVOUT)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 MIC922 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 MIC922 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/Capacitor Selection Conventional op amp gain configurations and resistor selection apply, the MIC922 is NOT a current feedback device. Also, for minimum peaking, the feedback resistor should have low parasitic capacitance. To use the part as a follower, the output should be connected to input via a short wire. At high frequency, the parasitic capacitance at the input might cause peaking in the closed-loop frequency response. A 1pF capacitor should be used across the feedback resistor to compensate for this parasitic peaking. 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.
MIC922
10
May 2006
MIC922
Micrel, Inc.
Package Information
SC-70 (C5)
MICREL INC.
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
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) 2002 Micrel, Inc.
May 2006
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MIC922

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