MICREL MIC911BM5

MIC911
105MHz Low-Power SOT23-5 Op Amp
General Description
Features
The MIC911 is a high-speed operational amplifier which is
unity gain stable regardless of resistive and capacitive
load. It provides a gain-bandwidth product of 105MHz, a
very low 1.25mA supply current, and features the Ittybitty®
SOT23-5 package.
Supply voltage range is from ±2.5V to ±9V, allowing the
MIC911 to be used in low-voltage circuits or applications
requiring large dynamic range.
The MIC911 is stable driving any capacitive 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 MIC911 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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05MHz gain bandwidth product
1.25mA supply current
Unconditionally unity gain stable
Drives any capacitive load
SOT23-5 package
120V/µs slew rate
112dB CMRR
Applications
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Video
Imaging
Ultrasound
Portable equipment
Line drivers
XDSL
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Ordering Information
Part Number
Temperature Range
Package
Lead Finish
MIC911BM5
–40° to +85°C
5-Pin SOT23
Standard
MIC911YM5
–40° to +85°C
5-Pin SOT23
Pb-Free
IttyBitty is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2007
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Micrel, Inc.
MIC911
Pin Configuration
Functional Pinout
IN+
3
V+ OUT
2
1
IN+
3
Part
Identification
V+ OUT
2
1
A22
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)
September 2007
Pin Function
Output: Amplifier Output
2
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Micrel, Inc.
MIC911
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VV+ – VV–) .............................................20V
Differential Input Voltage (|VIN+ – VIN–|)(3) .........................4V
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
10
Input Offset Voltage
Temperature Coefficient
4
Input Bias Current
1.5
Input Offset Current
0.03
Units
mV
µV/°C
4
µA
8
µA
2
µA
3
µA
+3.5
V
VCM
Input Common-Mode Range
CMRR > 60dB
CMRR
Common-Mode Rejection Ratio
–3V < VCM < +3V
80
110
dB
PSRR
Power Supply Rejection Ratio
±5V < VS < ±9V
75
88
dB
AVOL
Large-Signal Voltage Gain
RL = 2k, VOUT = ±2V
65
78
dB
RL = 200Ω, VOUT = ±1V
65
78
dB
+3.3
3.5
VOUT
Maximum Output Voltage Swing
–3.5
positive, RL = 2kΩ
V
V
+3.0
negative, RL = 2kΩ
–3.5
positive, RL = 200Ω
+2.8
–3.3
V
–3.0
V
3.2
V
V
+2.5
negative, RL = 200Ω, Note 5
–2.5
negative, RL = 200Ω, 25°C ≤ TJ ≤ +85°C,
Note 5
–1.7
V
–1.0
V
–1.7
V
GBW
Unity Gain-Bandwidth Product
RL = 1kΩ
95
MHz
BW
–3dB Bandwidth
AV = 2, RL = 470Ω
70
MHz
SR
Slew Rate
IGND
Short-Circuit Output Current
100
V/µs
source
65
mA
sink
17
mA
Supply Current
September 2007
1.25
3
1.8
mA
2.3
mA
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Micrel, Inc.
MIC911
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
Typ
Max
Units
Input Offset Voltage
1
10
mV
Input Offset Voltage
Temperature Coefficient
4
IB
Input Bias Current
IOS
Input Offset Current
Condition
Min
1.5
0.03
µV/°C
4
µA
8
µA
2
µA
3
µA
VCM
Input Common-Mode Range
CMRR > 60dB
–7.5
CMRR
Common-Mode Rejection Ratio
–7V < VCM < 7V
80
112
dB
V
AVOL
Large-Signal Voltage Gain
RL = 2kΩ, VOUT = ±6V
65
80
dB
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
+7.2
+7.4
V
+7.5
V
+6.8
negative, RL = 2kΩ
–7.4
–7.2
V
V
–6.8
GBW
Unity Gain-Bandwidth Product
RL = 1kΩ
105
MHz
BW
–3dB Bandwidth
AV = 2, RL = 470Ω
80
MHz
SR
Slew Rate
IGND
Short-Circuit Output Current
120
V/µs
source
80
mA
sink
22
mA
Supply Current
1.35
1.9
mA
2.4
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.
5. Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in “Typical Characteristics.”
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MIC911
Test Circuits
VCC
10µF
VCC
0.1µF
Input
R2
BNC
5k
10µF
0.1µF
10k
10k
10k
2k
4
2
MIC911
BNC
1
Input
R1 5k
BNC
Output
4
R7c 2k
2
0.1µF
MIC911
3
1
BNC
Output
3
5
5
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
VCC
R2 4k
10pF
R3 27k
S1
S2
R5
10µF
VEE
⎛ R2 R2 + R 5 + R4 ⎞
VOUT = VERROR ⎜ 1+
+
⎟
⎝ R1
⎠
R7
VEE
R1
R5
5k
4
10µF
2
0.1µF
MIC911
1
3
R4 27k
5
10pF
0.1µF
BNC
To
Dynamic
Analyzer
10µF
VEE
Noise Measurement
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MIC911
Typical Characteristics
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MIC911
Typical Characteristics (continued)
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MIC911
Typical Characteristics (continued)
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MIC911
Typical Characteristics (continued)
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MIC911
Functional Characteristics
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MIC911
Functional Characteristics (continued)
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MIC911
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 is
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.
Application Information
The MIC911 is a high-speed, voltage-feedback
operational amplifier featuring very low supply current
and excellent stability. This device is unity gain stable
and capable of driving high capacitance loads.
Driving High Capacitance
The MIC911 is stable when driving any 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.
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 MIC911 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.
Feedback Resistor Selection
Conventional op amp gain configurations and resistor
selection apply; the MIC911 is NOT a current feedback
device. Resistor values in the range of 1k to 10k are
recommended.
Layout Considerations
All high speed devices require careful PCB layout. The
high stability and high PSRR of the MIC911 make this op
amp easier to use than most, but 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.
September 2007
Max. Allowable Power Dissipation =
12
TJ(max) − TA(max)
260W
M9999-091307
Micrel, Inc.
MIC911
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.
© 2000 Micrel, Incorporated.
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