MICREL MIC911

MIC911
Micrel
MIC911
105MHz Low-Power SOT-23-5 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™ SOT-23-5
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 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 MIC911 ideal for portable equipment. The ability to
drive capacitative loads also makes it possible to drive long
coaxial cables.
•
•
•
•
•
•
•
•
105MHz gain bandwidth product
1.25mA supply current
Unconditionally unity gain stable
Drives any capacitive load
SOT-23-5 package
120V/µs slew rate
112dB CMRR
Stable with gain of +2 or –1
Applications
•
•
•
•
•
•
Video
Imaging
Ultrasound
Portable equipment
Line drivers
XDSL
Ordering Information
Pin Configuration
IN+
3
Part Number
Junction Temp. Range
Package
MIC911BM5
–40°C to +85°C
SOT-23-5
Functional Pinout
V+ OUT
2
1
IN+
Part
Identification
3
V+ OUT
2
1
A22
4
5
4
5
IN–
V–
IN–
V–
SOT-23-5
SOT-23-5
Pin Description
Pin Number
Pin Name
Pin Function
1
OUT
2
V+
Positive Supply (Input)
3
IN+
Noninverting Input
4
IN–
Inverting Input
5
V–
Negative Supply (Input)
Output: Amplifier Output
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
1
MIC911
MIC911
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
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.) ....................... 260°C
Storage Temperature (TS) ........................................ 150°C
ESD Rating, Note 4 ................................................... 1.5kV
Supply Voltage (VS) ....................................... ±2.5V to ±9V
Junction Temperature (TJ) ......................... –40°C to +85°C
Package 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
Parameter
VOS
Typ
Max
Units
Input Offset Voltage
1
10
mV
VOS
Input Offset Voltage
Temperature Coefficient
4
IB
Input Bias Current
1.5
4
8
µA
µA
IOS
Input Offset Current
0.03
2
3
µA
µA
VCM
Input Common-Mode Range
CMRR > 60dB
+3.5
V
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
+3.0
3.5
V
V
VOUT
Maximum Output Voltage Swing
Condition
Min
positive, RL = 2kΩ
–3.5
negative, RL = 2kΩ
positive, RL = 200Ω
–3.5
+2.8
+2.5
negative, RL = 200Ω, Note 5
µV/°C
–3.3
–3.0
3.2
–2.5
negative, RL = 200Ω, 25°C ≤ TJ ≤ +85°C,
Note 5
V
V
V
V
–1.7
–1.0
V
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
100
V/µs
IGND
Short-Circuit Output Current
source
65
mA
sink
17
mA
IGND
Supply Current
1.25
1.8
2.3
mA
mA
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
VOS
Input Offset Voltage
Temperature Coefficient
4
IB
Input Bias Current
MIC911
Condition
Min
1.5
2
µV/°C
4
8
µA
µA
June 2000
MIC911
Micrel
Symbol
Parameter
IOS
Input Offset Current
Condition
Min
Typ
Max
Units
0.03
2
3
µA
µA
+7.5
V
VCM
Input Common-Mode Range
CMRR > 60dB
–7.5
CMRR
Common-Mode Rejection Ratio
–7V < VCM < 7V
80
112
dB
AVOL
Large-Signal Voltage Gain
RL = 2kΩ, VOUT = ±6V
65
80
dB
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
+7.2
+6.8
+7.4
V
V
negative, RL = 2kΩ
–7.4
–7.2
–6.8
V
V
GBW
Unity Gain-Bandwidth Product
RL = 1kΩ
105
MHz
BW
–3dB Bandwidth
AV = 2, RL = 470Ω
80
MHz
SR
Slew Rate
120
V/µs
IGND
Short-Circuit Output Current
source
80
mA
sink
22
mA
Supply Current
IGND
1.35
1.9
2.4
mA
mA
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3.
Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is
likely to change).
Note 4.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 5.
Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in “Typical Characteristics.”
June 2000
3
MIC911
MIC911
Micrel
Test Circuits
VCC
10µF
VCC
0.1µF
50Ω
R2
BNC
5k
Input
10µF
0.1µF
10k
10k
10k
2k
4
BNC
MIC911
BNC
1
R1 5k
Input
2
R7c 2k
R7b 200Ω
Output
3
5
2
0.1µF
MIC911
1
BNC
Output
3
5
R7a 100Ω
50Ω
BNC
4
0.1µF
R6
0.1µF
5k
R3
200k
Input
50Ω
All resistors:
1% metal film
PSRR vs. Frequency
100pF
10pF
R3 27k
S1
S2
R5
20Ω
R4
250Ω
 R2 R2 + R 5 + R4 
VOUT = VERROR 1 +
+


 R1
R7
10µF
VEE
R1
20Ω
10µF
VEE
All resistors 1%
0.1µF
R5
5k
CMRR vs. Frequency
VCC
R2 4k
4
10µF
0.1µF
2
MIC911
1
3
5
BNC
To
Dynamic
Analyzer
0.1µF
R4 27k
10pF
10µF
VEE
Noise Measurement
MIC911
4
June 2000
MIC911
Micrel
Electrical Characteristics
Supply Current
vs. Temperature
Supply Current
vs. Supply Voltage
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
+85°C
+25°C
-40°C
1.0
0.5
2
3 4 5 6 7 8 9
SUPPLY VOLTAGE (±V)
0.0
1.8
VSUPPLY = ±9V
1.6
1.4
VSUPPLY = ±5V
1.2
OFFSET VOLTAGE (mV)
2.0
2.0
1.5
Offset Voltage
vs. Temperature
-1.0
VSUPPLY = ±9V
-1.5
1.0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
10
Bias Current
vs. Temperature
-2.0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Offset Voltage
vs. Common-Mode Voltage
2.5
VSUPPLY = ±5V
-0.5
Offset Voltage
vs. Common-Mode Voltage
-0.25
-0.5
2
VSUPPLY = ±9V
1
VSUPPLY = ±5V
0.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
+25°C
-0.75
-40°C
-1.00
SOURCING
CURRENT
65
60
VSUPPLY = ±5V
-15
SINKING
CURRENT
-25
VSUPPLY = ±9V
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
-40°C
-20
+25°C
+85°C
SINKING
CURRENT
3 4 5 6 7 8 9
SUPPLY VOLTAGE (±V)
+25°C
60
10
3.5
VSUPPLY = ±5V
-40°C
2.0
1.5
+25°C
1.0
0.5
0
0
-40°C
SOURCING
CURRENT
3 4 5 6 7 8 9
SUPPLY VOLTAGE (±V)
10
Output Voltage
vs. Output Current
0.0
+85°C
3.0
2.5
+85°C
40
20
2
4.0
-15
80
Output Voltage
vs. Output Current
-10
June 2000
VSUPPLY = ±5V
-20
Short-Circuit Current
vs. Supply Voltage
-30
2
100
-30
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
55
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
-25
Short-Circuit Current
vs. Supply Voltage
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
VSUPPLY = ±9V
80
70
-1.5
-8 -6 -4 -2 0 2 4 6 8
COMMON-MODE VOLTAGE (V)
-10
90
+25°C
-40°C
Short-Circuit Current
vs. Temperature
95
75
+85°C
-1.0
-1.25
-5 -4 -3 -2 -1 0 1 2 3 4 5
COMMON-MODE VOLTAGE (V)
Short-Circuit Current
vs. Temperature
85
+85°C
SOURCING
CURRENT
20
40
60
80
OUTPUT CURRENT (mA)
5
OUTPUT VOLTAGE (V)
1.5
-0.50
VSUPPLY = ±9V
OFFSET VOLTGE (mV)
OFFSET VOLTGE (mV)
BIAS CURRENT (µA)
VSUPPLY = ±5V
SINKING
CURRENT
-0.5
-1.0 +25°C
-40°C
-1.5
-2.0
-2.5
+85°C
-3.0
-3.5
-4.0
-25
VSUPPLY = ±5V
-20
-15
-10
-5
OUTPUT CURRENT (mA)
0
MIC911
MIC911
Micrel
0
0
36
34
32
200 400 600 800 1000
CAPACITIVE LOAD (pF)
150
120
44
100
42
100
40
Gain
Bandwidth
75
38
60
VSUPPLY = ±5V
40
36
25
34
20
32
10
0
3 4 5 6 7 8 9
SUPPLY VOLTAGE (±V)
PHASE MARGIN (°)
80
50
0
2
32
200 400 600 800 1000
CAPACITIVE LOAD (pF)
Common-Mode
Rejection Ratio
46
125
34
1x107
Gain
Bandwidth
25
Phase
Margin
36
Gain
Bandwidth
25
1x106
38
50
50
0
0
0
38
1x105
40
75
-20
-10
OUTPUT CURRENT (mA)
40
Phase
Margin
75
1x102
Phase
Margin
VSUPPLY = ±9V
42
100
CMRR (dB)
42
100
-8
175
44
GAIN BANDWIDTH (MHz)
125
-6
44
125
Gain Bandwidth and
Phase Margin vs. Supply Voltage
46
VSUPPLY = ±9V
150
+85°C
-10
-30
PHASE MARGIN (°)
175
-4
150
1x104
4
3
-40°C
2
SOURCING
1
CURRENT
0
0
20
40
60
80
100
OUTPUT CURRENT (mA)
-40°C
46
VSUPPLY = ±5V
1x103
+25°C
-2
SINKING
CURRENT
PHASE MARGIN (°)
+85°C
+25°C
GAIN BANDWIDTH (MHz)
VSUPPLY = ±9V
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
175
0
10
9
8
7
6
5
Gain Bandwidth and
Phase Margin vs. Load
GAIN BANDWIDTH (MHz)
Gain Bandwidth and
Phase Margin vs. Load
Output Voltage
vs. Output Current
Output Voltage
vs. Output Current
FREQUENCY (Hz)
Positive Power Supply
Rejection Ratio
100
100
80
80
40
FREQUENCY (Hz)
FREQUENCY (Hz)
Positive Power Supply
Rejection Ratio
Negative Power Supply
Rejection Ratio
Closed-Loop
Frequency Response
80
FREQUENCY (Hz)
1x107
2
1x107
1x106
0
1x105
0
1x104
20
1x103
20
1x106
VSUPPLY = ±9V
1x105
VSUPPLY = ±9V
40
1x104
40
60
1x103
60
1x10
–PSRR (dB)
80
GAIN (dB)
FREQUENCY (Hz)
10
8
6
4
2
0
-2
-4
-6
-8
-10
1
GAIN
PHASE
180
135
90
±9V
45
0
-45
-90
-135
-180
±5V
-225
-270
10
100 200
FREQUENCY (MHz)
±2.5V
PHASE (°)
1x107
1x106
1x105
1x104
1x102
1x10
1x107
0
1x106
0
1x103
VSUPPLY = ±5V
20
100
1x10
60
20
2
1x107
1x106
1x105
1x104
1x103
VSUPPLY = ±5V
100
2
+PSRR (dB)
1x10
2
0
40
1x105
40
60
1x104
VSUPPLY = ±9V
60
1x103
80
–PSRR (dB)
100
20
MIC911
Negative Power Supply
Rejection Ratio
120
+PSRR (dB)
CMRR (dB)
Common-Mode
Rejection Ratio
FREQUENCY (Hz)
6
June 2000
MIC911
Micrel
50pF
0pF
1000pF
470pF
200pF
10
100 200
FREQUENCY (MHz)
-10
-20
-30
-40
-50
1
-10
-45
No Load
-20
-90
-30
-135
-40 VSUPPLY = ±9V
-180
-50
-225
1
10
100 200
FREQUENCY (MHz)
10
8
6
4
2
0
1000pF
470pF
200pF
10
100 200
FREQUENCY (MHz)
Closed-Loop
Frequency Response
100pF
500pF
200pF
1000pF
50pF
0pF
10
8
6
4
2
0
-2
-4
VSUPPLY = ±9V
-6
AV = 1
-8
-10
1
10
100 200
FREQUENCY (MHz)
100
-2
-4
VSUPPLY = ±5V
-6
AV = 1
-8
-10
1
10
100 200
FREQUENCY (MHz)
100
75
VCC = ±5V
50
25
0
0
Closed-Loop
Frequency Response
Test Circuit
75
25
0
0
200 400 600 800 1000
LOAD CAPACITANCE (pF)
10µF
150
CL
RF
100
50
0
0
50Ω
SLEW RATE (V/µs)
FET probe
SLEW RATE (V/µs)
VCC = ±9V
MIC911
200 400 600 800 1000
LOAD CAPACITANCE (pF)
Negative
Slew Rate
150
0.1µF
VCC = ±5V
50
Positive
Slew Rate
VCC
100pF
500pF
200pF
1000pF
50pF
0pF
Negative
Slew Rate
SLEW RATE (V/µs)
100pF
500pF
200pF 50pF
1000pF
0pF
RL = 100Ω
225
180
135
90
45
0
-10
-45
No Load
-20
-90
-30
-135
-40 VSUPPLY = ±5V
-180
-50
-225
1
10
100 200
FREQUENCY (MHz)
Positive
Slew Rate
SLEW RATE (V/µs)
GAIN (dB)
0pF
-2
-4
-6 V
SUPPLY = ±2.5V
-8 A = 1
V
-10
1
10
100 200
FREQUENCY (MHz)
Closed-Loop
Frequency Response
10
8
6
4
2
0
100pF
GAIN (dB)
225
180
135
90
45
0
RL = 100Ω
GAIN (dB)
50
40
30
20
10
0
50pF
Closed-Loop
Frequency Response
PHASE (°)
GAIN (dB)
Open-Loop
Frequency Response
VSUPPLY = ±9V
50
40
30
20
10
0
PHASE (°)
100pF
50
40
30
20
10
0
GAIN (dB)
VSUPPLY = ±5V
-10
-20
-30
-40
-50
1
Open-Loop
Frequency Response
Open-Loop Frequency
Response vs. Capacitive Load
GAIN (dB)
GAIN (dB)
Open-Loop Frequency
Response vs. Capacitive Load
50
40
30
20
10
0
200 400 600 800 1000
LOAD CAPACITANCE (pF)
VCC = ±9V
100
50
0
0
200 400 600 800 1000
LOAD CAPACITANCE (pF)
10µF
VEE
June 2000
7
MIC911
MIC911
Micrel
Voltage
Noise
Current
Noise
7
2
1x105
1
1x101
FREQUENCY (Hz)
MIC911
3
0
1x105
1x104
1x101
0
1x103
50
4
1x104
100
5
1x103
150
6
1x102


NOISE CURRENT pA

Hz 
200
1x102
NOISE VOLTAGE
 nV


Hz 
250
FREQUENCY (Hz)
8
June 2000
MIC911
Micrel
Small-Signal
Pulse Response
Small-Signal
Pulse Response
INPUT
Small-Signal
Pulse Response
Small-Signal
Pulse Response
INPUT
VCC = ±9V
AV = 1
CL = 1.7pF
RL = 10MΩ
OUTPUT
OUTPUT
INPUT
VCC = ±5V
AV = 1
CL = 1000pF
Small-Signal
Pulse Response
Small-Signal
Pulse Response
June 2000
VCC = ±9V
AV = 1
CL = 1000pF
RL = 10MΩ
OUTPUT
INPUT
VCC = ±9V
AV = 1
CL = 100pF
RL = 10MΩ
OUTPUT
INPUT
VCC = ±5V
AV = 1
CL = 100pF
RL = 10MΩ
OUTPUT
OUTPUT
INPUT
VCC = ±5V
AV = 1
CL = 1.7pF
RL = 10MΩ
9
MIC911
MIC911
Micrel
Large-Signal
Pulse Response
Large-Signal
Pulse Response
VCC = ±5V
AV = 1
CL = 100pF
RL = 10MΩ
OUTPUT
OUTPUT
VCC = ±5V
AV = 1
CL = 1.7pF
RL = 10MΩ
∆V = 5.44V
∆t = 42ns
Large-Signal
Pulse Response
∆V = 5.52V
∆t = 46ns
Large-Signal
Pulse Response
VCC = ±9V
AV = 1
CL = 1.7pF
RL = 10MΩ
OUTPUT
OUTPUT
VCC = ±5V
AV = 1
CL = 1000pF
RL = 10MΩ
∆V = 5.32V
∆t = 100ns
Large-Signal
Pulse Response
∆V = 5.52V
∆t = 34ns
Large-Signal
Pulse Response
MIC911
VCC = ±9V
AV = 1
CL = 1000pF
RL = 10MΩ
OUTPUT
OUTPUT
VCC = ±9V
AV = 1
CL = 100pF
RL = 10MΩ
∆V = 5.24V
∆t = 36ns
10
∆V = 5.56V
∆t = 84ns
June 2000
MIC911
Micrel
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 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
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
Applications 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.
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.
June 2000
(
)
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 SOT23-5
package has a thermal resistance of 260°C/W.
Max . Allowable Power Dissipation =
11
TJ (max) − TA(max)
260W
MIC911
MIC911
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)
1.30 (0.051)
0.90 (0.035)
3.02 (0.119)
2.80 (0.110)
0.20 (0.008)
0.09 (0.004)
10°
0°
0.15 (0.006)
0.00 (0.000)
0.50 (0.020)
0.35 (0.014)
0.60 (0.024)
0.10 (0.004)
SOT-23-5 (M5)
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.
© 2000 Micrel Incorporated
MIC911
12
June 2000