Page 1
MIC914 Micrel
MIC914
160MHz Low-Power SOT-23-5 Op Amp
General Description
The MIC914 is a high-speed operational amplifier with a gainbandwidth product of 160MHz. The part is unity gain stable
provided its output is loaded with at least 200Ω. It has 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
MIC914 to be used in low-voltage circuits or applications
requiring large dynamic range.
The MIC914 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 MIC914 ideal for portable equipment. The ability to
drive capacitative loads also makes it possible to drive long
coaxial cables.
™
Features
• 160MHz gain bandwidth product
• 1.25mA supply current
• SOT-23-5 package
• 160V/µs slew rate
• drives any capacitive load
• 112dB CMRR
Applications
• Video
• Imaging
• Ultrasound
• Portable equipment
• Line drivers
• XDSL
Ordering Information
Part Number Junction Temp. Range Package
MIC914BM5 –40°C to +85°C SOT-23-5
Pin Configuration
IN+
OUTV+
13
2
Part
Identification
A26
45
IN–
V–
SOT-23-5
Pin Description
Pin Number Pin Name Pin Function
1 OUT Output: Amplifier Output
2 V+ Positive Supply (Input)
3 IN+ Noninverting Input
4 IN– Inverting Input
5 V– Negative Supply (Input)
Functional Pinout
IN+
45
IN–
OUTV+
13
2
V–
SOT-23-5
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 MIC914
Page 2
MIC914 Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
Differentail Input Voltage (V
Input Common-Mode Range (V
– VV–) ........................................... 20V
V+
IN+
– V
IN+
) .......... 4V, Note 3
IN–
, V
) .......... VV+ to V
IN–
Operating Ratings (Note 2)
Supply Voltage (V
Junction Temperature (T
Package Thermal Resistance ............................... 260°C/W
V–
) ....................................... ±2.5V to ±9V
S
) ......................... –40°C to +85°C
J
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T
) ........................................ 150°C
S
ESD Rating, Note 4 ................................................... 1.5kV
Electrical Characteristics (±5V)
VV+ = +5V, VV– = –5V, VCM = 0V, V
Symbol Parameter Condition Min Typ Max Units
V
OS
V
OS
Input Offset Voltage 1 10 mV
Input Offset Voltage 4 µV/°C
Temperature Coefficient
I
B
I
OS
V
CM
Input Bias Current 1.5 4 µA
Input Offset Current 2 µA
Input Common-Mode Range CMRR > 60dB –3.5 +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
A
V
VOL
OUT
Large-Signal Voltage Gain RL = 2k, V
Maximum Output Voltage Swing positive, RL = 2kΩ +3.3 3.5 V
GBW Unity Gain-Bandwidth Product RL = 1kΩ 135 MHz
BW –3dB Bandwidth AV = 2, RL = 470Ω 155 MHz
SR Slew Rate 135 V/µs
I
GND
I
GND
Short-Circuit Output Current source 65 mA
Supply Current 1.25 1.8 mA
= 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.
OUT
0.03 3 µA
= ±2V 65 78 dB
OUT
RL = 200Ω, V
= ±1V 65 78 dB
OUT
+3.0 V
negative, R
positive, R
negative, R
negative, R
Note 5
= 2kΩ –3.5 –3.3 V
L
= 200Ω +2.8 3.2 V
L
= 200Ω, Note 5 –2.5 –1.7 V
L
= 200Ω, 25°C ≤ TJ ≤ +85°C, –1.7 V
L
+2.5 V
sink 17 mA
8 µA
–3.0 V
–1.0 V
2.3 mA
Electrical Characteristics
VV+ = +9V, VV– = –9V, VCM = 0V, V
Symbol Parameter Condition Min Typ Max Units
V
OS
V
OS
Input Offset Voltage 1 10 mV
Input Offset Voltage 4 µV/°C
Temperature Coefficient
I
B
Input Bias Current 1.5 4 µA
MIC914 2 June 2000
= 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
OUT
8 µA
Page 3
MIC914 Micrel
Symbol Parameter Condition Min Typ Max Units
I
OS
V
CM
CMRR Common-Mode Rejection Ratio –7V < VCM < 7V 80 112 dB
A
VOL
V
OUT
GBW Gain-Bandwidth Product RL = 1kΩ 160 MHz
BW –3dB Bandwidth AV = 2, RL = 470Ω 185 MHz
SR Slew Rate 160 V/µs
I
GND
I
GND
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
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.”
Input Offset Current 2 µA
0.03 3 µA
Input Common-Mode Range CMRR > 60dB –7.5 +7.5 V
Large-Signal Voltage Gain RL = 2kΩ, V
= ±6V 65 80 dB
OUT
Maximum Output Voltage Swing positive, RL = 2kΩ +7.2 +7.4 V
+6.8 V
negative, R
= 2kΩ –7.4 –7.2 V
L
Short-Circuit Output Current source 80 mA
sink 22 mA
Supply Current 1.35 1.9 mA
likely to change).
–6.8 V
2.4 mA
June 2000 3 MIC914
Page 4
MIC914 Micrel
c
r
Test Circuits
V
CC
10µF
V
CC
Input
BNC
50Ω
0.1µF
0.1µF
R2
5k
10µF
Input
10k
4
MIC914
3
10k
10k
50Ω
BNC
0.1µF
50Ω
All resistors:
1% metal film
PSRR vs. Frequency
2k
2
5
BNC
1
Output
Input
BNC
R1 5k
R7c 2k
R7b 200Ω
R7a 100Ω
4
MIC914
3
0.1µF
2
5
0.1µF
1
BNC
Output
R6
5k
R3
R4
250Ω
R5
5k
++
5
R7
200k
0.1µF
10µF
V
EE
All resistors 1%
R2R1R2 R R4
VV
=++
OUT ERROR
1
10µF
V
EE
CMRR vs. Frequency
100pF
V
CC
R1
20Ω
R5
20Ω
10pF
R3 27k
S1
S2
R4 27k
R2 4k
4
MIC914
3
2
5
10µF
0.1µF
0.1µF
1
BNC
To
Dynami
Analyze
10pF
10µF
V
EE
Noise Measurement
MIC914 4 June 2000
Page 5
MIC914 Micrel
-2.0
-1.5
-1.0
-0.5
0.0
-40 -20 0 20 40 60 80 100
OFFSET VOLTAGE (mV)
TEMPERATURE (°C)
Offset Voltage
vs. Temperature
V
SUPPLY
= ±5V
V
SUPPLY
= ±9V
-1.25
-1.00
-0.75
-0.50
-0.25
-5-4-3-2-1012345
OFFSET VOLTGE (mV)
COMMON-MODE VOLTAGE (V)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 20406080
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
-25 -20 -15 -10 -5 0
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current
+85°C
+25°C
-40°C
SINKING
CURRENT
V
SUPPLY
= ±5V
Electrical Characteristics
Supply Current
vs. Supply Voltage
2.0
+85°C
1.5
1.0
SUPPLY CURRENT (mA)
0.5
2345678910
SUPPLY VOLTAGE (±V)
+25°C
-40°C
Bias Current
vs. Temperature
2.5
2
V
1.5
1
BIAS CURRENT (µA)
V
SUPPLY
0.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
SUPPLY
= ±5V
= ±9V
Supply Current
2.0
1.8
1.6
1.4
1.2
SUPPLY CURRENT (mA)
1.0
vs. Temperature
V
= ±9V
SUPPLY
V
= ±5V
SUPPLY
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Offset Voltage
vs. Common-Mode Voltage
V
= ±5V
SUPPLY
+85°C
+25°C
-40°C
Offset Voltage
vs. Common-Mode Voltage
-0.5
+85°C
-1.0
OFFSET VOLTGE (mV)
-1.5
-8 -6 -4 -2 0 2 4 6 8
COMMON-MODE VOLTAGE (V)
+25°C
V
SUPPLY
-40°C
= ±9V
95
90
85
80
75
70
65
OUTPUT CURRENT (mA)
60
55
-10
-15
-20
June 2000 5 MIC914
-25
OUTPUT CURRENT (mA)
-30
Short-Circuit Current
vs. Temperature
V
= ±9V
SUPPLY
SOURCING
CURRENT
V
= ±5V
SUPPLY
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Short-Circuit Current
vs. Supply Voltage
-40°C
+25°C
+85°C
SINKING
CURRENT
2345678910
SUPPLY VOLTAGE (±V)
Short-Circuit Current
vs. Temperature
-10
-15
-20
-25
OUTPUT CURRENT (mA)
-30
-40 -20 0 20 40 60 80 100
V
= ±5V
SUPPLY
SINKING
CURRENT
V
= ±9V
SUPPLY
TEMPERATURE (°C)
Output Voltage
vs. Output Current
+85°C
V
= ±5V
SUPPLY
-40°C
+25°C
SOURCING
CURRENT
Short-Circuit Current
vs. Supply Voltage
100
80
+25°C
60
40
OUTPUT CURRENT (mA)
20
2345678910
SUPPLY VOLTAGE (±V)
-40°C
+85°C
SOURCING
CURRENT
Page 6
MIC914 Micrel
(
)
(
)
(
)
Output Voltage
vs. Output Current
10
9
+85°C
8
7
6
5
4
3
2
OUTPUT VOLTAGE (V)
SOURCING
1
CURRENT
0
0 20406080100
OUTPUT CURRENT (mA)
-40°C
V
SUPPLY
= ±9V
+25°C
Gain Bandwidth and
Phase Margin vs. Capacitive Load
175
150
125
100
75
50
25
GAIN BANDWIDTH (MHz)
0
0 200 400 600 800 1000
CAPACITIVE LOAD (pF)
V
SUPPLY
Gain
Bandwidth
Phase
Margin
= ±9V
70
60
°
50
40
30
20
PHASE MARGIN
10
0
Output Voltage
vs. Output Current
0
-2
-4
-6
-8
OUTPUT VOLTAGE (V)
-10
-30 -20 -10 0
+25°C
+85°C
V
SUPPLY
OUTPUT CURRENT (mA)
= ±9V
SINKING
CURRENT
-40°C
Gain Bandwidth and
Phase Margin vs. Supply Voltage
175
Gain
150
Bandwidth
125
100
75
50
25
GAIN BANDWIDTH (MHz)
0
2345678910
Phase
Margin
SUPPLY VOLTAGE (±V)
35
30
°
25
20
15
10
PHASE MARGIN
5
0
Gain Bandwidth and
Phase Margin vs. Capacitive Load
150
125
100
75
50
25
GAIN BANDWIDTH (MHz)
0
0 200 400 600 800 1000
Gain
Bandwidth
CAPACITIVE LOAD (pF)
V
SUPPLY
Phase
Margin
= ±5V
Common-Mode
120
100
CMRR (dB)
Rejection Ratio
80
60
V
= ±5V
40
20
0
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
60
50
°
40
30
20
PHASE MARGIN
10
0
7
Positive Power Supply
100
+PSRR (dB)
Rejection Ratio
80
60
40
20
0
V
= ±5V
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
Positive Power Supply
100
+PSRR (dB)
Rejection Ratio
80
60
40
20
0
V
= ±9V
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
Negative Power Supply
100
–PSRR (dB)
7
Rejection Ratio
80
60
40
20
0
V
= ±5V
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
120
100
CMRR (dB)
7
Negative Power Supply
100
–PSRR (dB)
7
Rejection Ratio
80
60
40
20
0
V
= ±9V
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
10
GAIN (dB)
7
-10
Common-Mode
Rejection Ratio
80
V
60
40
20
0
1x1021x1031x1041x1051x1061x10
= ±9V
SUPPLY
FREQUENCY (Hz)
Closed-Loop
Frequency Response
200pF
100pF
50pF
0pF
500pF
1000pF
8
6
4
2
0
-2
-4
-6
V
= ±2.5V
SUPPLY
-8
A
= 1
V
1 10 100 200
FREQUENCY (MHz)
7
MIC914 6 June 2000
Page 7
MIC914 Micrel
0
25
50
75
100
125
150
0 200 400 600 800 1000
SLEW RATE (V/µs)
LOAD CAPACITANCE (pF)
(
)
-10
-8
-6
-4
-2
0
2
4
6
8
10
1 10 100 200
GAIN (dB)
FREQUENCY (MHz)
(
)
-50
-40
-30
-20
-10
0
10
20
30
40
50
-225
-180
-135
-90
-45
0
45
90
135
180
225
1 10 100 200
GAIN (dB)
PHASE (°)
FREQUENCY (MHz)
Closed-Loop
Frequency Response
10
8
6
4
2
0
-2
GAIN (dB)
-4
-6
-8
-10
1 10 100 200
GAIN
±5V
PHASE
±2.5V
FREQUENCY (MHz)
Open-Loop
Frequency Response
50
40
30
20
10
0
-10
GAIN (dB)
-20
-30
-40
V
SUPPLY
-50
1 10 100 200
RL= 100Ω
No Load
= ±5V
FREQUENCY (MHz)
±9V
180
135
90
45
0
-45
-90
-135
-180
-225
-270
225
180
135
90
45
0
-45
-90
-135
-180
-225
°
PHASE
°
PHASE
Open-Loop Frequency
Response vs. Capacitive Load
470pF
V
SUPPLY
1000pF
= ±5V
200pF
100pF
50pF
0pF
Open-Loop
Frequency Response
RL= 100Ω
No Load
V
= ±9V
SUPPLY
Open-Loop Frequency
Response vs. Capacitive Load
10
8
6
4
2
0
-2
GAIN (dB)
-4
-6
V
SUPPLY
-8
-10
1 10 100 200
470pF
1000pF
= ±9V
FREQUENCY (MHz)
Closed-Loop
Frequency Response
Test Circuit
V
CC
10µF
0.1µF
MIC914
RF
50Ω
10µF
V
EE
200pF
100pF
50pF
FET probe
C
L
0pF
150
125
100
75
50
SLEW RATE (V/µs)
25
0
0 200 400 600 800 1000
150
125
100
75
June 2000 7 MIC914
50
SLEW RATE (V/µs)
25
0
0 200 400 600 800 1000
Positive
Slew Rate
VCC = ±5V
LOAD CAPACITANCE (pF)
Negative
Slew Rate
VCC = ±9V
LOAD CAPACITANCE (pF)
Negative
Slew Rate
VCC = ±5V
Voltage
250
200
Hz
nV
150
100
50
NOISE VOLTAGE
0
1x1011x1021x1031x1041x10
Noise
FREQUENCY (Hz)
Positive
150
125
100
75
50
SLEW RATE (V/µs)
25
0
0 200 400 600 800 1000
Slew Rate
VCC = ±9V
LOAD CAPACITANCE (pF)
Current
7
6
Hz
5
pA
4
3
2
1
NOISE CURRENT
5
0
1x1011x1021x1031x1041x10
Noise
5
FREQUENCY (Hz)
Page 8
MIC914 Micrel
OUTPUT INPUT
VCC = ±5V
= 1
A
V
= 1.7pF
C
L
VCC = ±5V
= 1
A
V
= 100pF
C
L
Small-Signal
Pulse Response
Small-Signal
Pulse Response
OUTPUT INPUT
VCC = ±9V
= 1
A
V
= 1.7pF
C
L
VCC = ±9V
= 1
A
V
= 1000pF
C
L
Small-Signal
Pulse Response
Small-Signal
Pulse Response
OUTPUT INPUT
OUTPUT INPUT
VCC = ±5V
= 1
A
V
= 100pF
C
L
Small-Signal
Pulse Response
OUTPUT INPUT
OUTPUT INPUT
VCC = ±9V
= 1
A
V
= 1000pF
C
L
Small-Signal
Pulse Response
MIC914 8 June 2000
Page 9
MIC914 Micrel
Large-Signal
Pulse Response
VCC = ±5V
A
V
= –1
C
L
= 100pF
R
L
= 470Ω
OUTPUT
∆V = 5.52V
∆t = 56ns
Large-Signal
Pulse Response
VCC = ±9V
A
V
= –1
C
L
= 100pF
R
L
= 470MΩ
OUTPUT
∆V = 5.08V
∆t = 38ns
Large-Signal
Pulse Response
VCC = ±9V
A
V
= –1
C
L
= 1000pF
R
L
= 470MΩ
OUTPUT
∆V = 6.40V
∆t = 115ns
Large-Signal
Pulse Response
VCC = ±5V
= –1
A
V
= 1.7pF
C
L
= 470Ω
R
L
∆V = 5.28V
OUTPUT
∆t = 50ns
Large-Signal
Pulse Response
OUTPUT
OUTPUT
∆V = 5.24V
∆t = 115ns
Large-Signal
Pulse Response
∆V = 5.48V
∆t = 44ns
VCC = ±5V
= –1
A
V
= 100pF
C
L
= 470Ω
R
L
VCC = ±9V
= –1
A
V
= 1000pF
C
L
= 470MΩ
R
L
June 2000 9 MIC914
Page 10
MIC914 Micrel
PVVI
DVV
S
(no load)
=−
()
+−
Total Power Dissipation P P
DDt
=+
(no load) (outpu stage)
Applications Information
The MIC914 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 MIC914 is unity gain stable and it is capable of driving
unlimited capacitance loads, but some design considerations
are required to ensure stability.
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
MIC911, a more heavily compensated version of the MIC914
which provides extremely stable operation for all load resistance and capacitance.
For stability considerations at different supply voltages, please
refer to the graph elsewhere in the datasheet entitled "Gain
Bandwidth and Phase Margin vs. Supply Voltage".
Driving High Capacitance
The MIC914 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 MIC914 is NOT a current feedback device.
Also, for minimum peaking, the feedback resistor should
have low parasitic capacitance, usually 470Ω is ideal. To use
the part as a follower, the output should be connected to input
via a short wire.
The output needs to be
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.
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.
An MIC914 with no load, dissipates power equal to the
quiescent supply current * supply voltage
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.
PVVI
DV
(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
. =
=−
()
+
OUT OUT
TT
−
JA
(max) (max)
260W
MIC914 10 June 2000
Page 11
MIC914 Micrel
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
3.02 (0.119)
2.80 (0.110)
0.50 (0.020)
0.35 (0.014)
1.75 (0.069)
1.50 (0.059)
1.30 (0.051)
0.90 (0.035)
0.15 (0.006)
0.00 (0.000)
SOT-23-5 (M5)
3.00 (0.118)
2.60 (0.102)
10°
0°
DIMENSIONS:
MM (INCH)
0.20 (0.008)
0.09 (0.004)
0.60 (0.024)
0.10 (0.004)
June 2000 11 MIC914
Page 12
MIC914 Micrel
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© 2000 Micrel Incorporated
MIC914 12 June 2000
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