MICREL MIC912YM5

MIC912
200MHz Low-Power SOT23-5 Op Amp
General Description
Features
The MIC912 is a high-speed, operational amplifier with a
gain-bandwidth product of 200MHz. The part is unity-gain
stable provided its output is loaded with at least 200Ω. It
has a very low, 2.4mA supply current, and features the tiny
SOT23-5 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 capacitive 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 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.
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•
•
•
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200MHz gain bandwidth product
2.4mA supply current
SOT23-5 package
360V/µs slew rate
Drives any capacitive load
Unconditionally stable with gain of +2 or –1
Conditionally stable with gain of +1
Applications
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•
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Video
Imaging
Ultrasound
Portable equipment
Line drivers
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Ordering Information
Part Number
Temperature Range
Package
Lead Finish
MIC912BM5
–40° to +85°C
5-Pin SOT23
Standard
MIC912YM5
–40° to +85°C
5-Pin SOT23
Pb-Free
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2007
M9999-100507
Micrel, Inc.
MIC912
Pin Configuration
Functional Pinout
IN+
3
V+ OUT
2
1
IN+
3
Part
Identification
V+ OUT
2
1
A23
4
5
IN–
V–
SOT23-5
4
5
IN–
V–
SOT23-5
Pin Description
Pin Number
Pin Name
1
OUT
2
V+
Positive Supply (Input)
3
IN+
Non-inverting Input
4
IN–
Inverting Input
5
V–
Negative Supply (Input)
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Pin Function
Output: Amplifier Output
2
M9999-100507
Micrel, Inc.
MIC912
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VV+ – VV–) .............................................20V
Differential Input Voltage (|VIN+ – VIN–|)(3) .........................8V
Input Common-Mode Range (VIN+ – VIN–) .............VV+ to VV–
Lead Temperature (soldering, 5 sec.)........................ 260°C
Storage Temperature (Ts) .......................................... 150°C
ESD Rating(4) ............................................................... 1.5kV
Supply Voltage (VS)......................................... ±2.5V to ±9V
Junction Temperature (TJ) .......................... –40°C to +85°C
Thermal Resistance ...............................................260°C/W
Electrical Characteristics (±5V)
VV+ = +5V, VV– = –5V, VCM = 0V, VOUT = 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.
Symbol
VOS
IB
IOS
Parameter
Condition
Min
Typ
Max
Input Offset Voltage
1
15
Input Offset Voltage
Temperature Coefficient
4
Input Bias Current
3.5
Input Offset Current
0.05
VCM
Input Common-Mode Range
CMRR > 60dB
CMRR
Common-Mode Rejection Ratio
–2.5V < VCM < +2.5V
–3.25
70
Power Supply Rejection Ratio
±5V < VS < ±9V
74
5.5
µA
9
µA
3
µA
+3.25
90
Large-Signal Voltage Gain
VOUT
Maximum Output Voltage Swing
RL = 2k, VOUT = ±2V
dB
90
dB
dB
71
dB
60
71
dB
+3.3
3.5
V
60
RL = 200Ω, VOUT = ±1V
positive, RL = 2kΩ
V
+3.0
negative, RL = 2kΩ
–3.5
positive, RL = 200Ω
+3.0
–3.3
V
–3.0
V
3.2
V
V
+2.75
negative, RL = 200Ω
V
dB
70
AVOL
mV
µV/°C
60
PSRR
Units
–2.8
–2.45
V
–2.2
V
GBW
Unity Gain-Bandwidth Product
RL = 1kΩ
170
MHz
BW
–3dB Bandwidth
AV = 1, RL = 100Ω
150
MHz
SR
Slew Rate
325
V/µs
IGND
Short-Circuit Output Current
source
72
mA
sink
25
mA
Supply Current
October 2007
2.4
3
3.5
mA
4.1
mA
M9999-100507
Micrel, Inc.
MIC912
Electrical Characteristics
VV+ = +9V, VV– = –9V, VCM = 0V, VOUT = 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.
Symbol
Parameter
VOS
Condition
Min
Typ
Max
Units
Input Offset Voltage
1
15
mV
Input Offset Voltage
Temperature Coefficient
4
IB
Input Bias Current
3.5
IOS
Input Offset Current
0.05
VCM
Input Common-Mode Range
CMRR > 60dB
CMRR
Common-Mode Rejection Ratio
–6.5V < VCM < 6.5V
–7.25
70
µV/°C
5.5
µA
9
µA
3
µA
+7.25
V
98
dB
dB
60
AVOL
Large-Signal Voltage Gain
RL = 2kΩ, VOUT = ±6V
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
60
73
dB
+7.2
+7.4
V
V
+6.8
negative, RL = 2kΩ
–7.4
RL = 1kΩ
200
MHz
360
V/µs
–7.2
–6.8
GBW
Unity Gain-Bandwidth Product
SR
Slew Rate
IGND
Short-Circuit Output Current
V
V
source
90
mA
sink
32
mA
Supply Current
2.5
3.7
mA
4.3
mA
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.
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MIC912
Test Circuits
VCC
10µF
VCC
Input
0.1µF
50
BNC
R2
5k
10µF
0.1µF
10k
10k
10k
2k
4
2
MIC912
BNC
1
Input
R1 5k
BNC
Output
4
R7c 2k
2
0.1µF
MIC912
3
3
5
5
1
BNC
Output
0.1µF
R6
Input
BNC
0.1µF
5k
R3
200k
0.1µF
All resistors:
1% metal film
All resistors 1%
10µF
PSRR vs. Frequency
R4
CMRR vs. Frequency
100pF
10pF
R3 27k
S1
S2
R5
10µF
VEE
⎛ R2 R2 + R 5 + R4 ⎞
VOUT = VERROR ⎜ 1+
+
⎟
⎝ R1
⎠
R7
VEE
R1
R5
5k
R4 27k
VCC
R2 4k
4
10µF
2
0.1µF
MIC912
1
3
5
10pF
0.1µF
BNC
To
Dynamic
Analyzer
10µF
VEE
Noise Measurement
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MIC912
Typical Characteristics
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MIC912
Typical Characteristics (continued)
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Micrel, Inc.
MIC912
Typical Characteristics (continued)
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MIC912
Functional Characteristics
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MIC912
Functional Characteristics (continued)
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MIC912
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.
Application 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 ≤ 200Ω 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 200Ω 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.
Power Supply Bypassing
Regular supply bypassing techniques are recommended. A 10µF capacitor in parallel with a 0.1µF
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 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 85°C. The part can be operated up to the
absolute maximum temperature rating of 125°C, but
between 85°C and 125°C performance will degrade, in
particular CMRR will reduce.
A 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+ – 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 260°C/W.
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
(<100Ω) 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.
October 2007
Max. Allowable Power Dissipation =
11
TJ(max) − TA(max)
260W
M9999-100507
Micrel, Inc.
MIC912
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.
© 2001 Micrel, Incorporated.
October 2007
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