MICREL MIC918

MIC918
Micrel
MIC918
51MHz Low-Power SOT-23-5/SC-70 Op Amp
Final Information
General Description
Features
The MIC918 is a high-speed operational amplifier with a
gain-bandwidth product of 51MHz. The part is unity gain
stable. Ithas a very low 550A supply current, and features
the IttyBitty ™ SOT-23-5 package and SC-70 package.
Supply voltage range is from ±2.5V to ±9V, allowing the
MIC918 to be used in low-voltage circuits or applications
requiring large dynamic range.
The MIC918 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 MIC918 ideal for portable equipment.
The ability to drive capacitative loads also makes it possible to drive long coaxial cables.
• 51MHz gain bandwidth product
• 550µA supply current
• SOT-23-5 or SC-70 packages
• 1500V/µs slew rate
• drives any capacitive load
• Unity gain stable
Applications
• Video
• Imaging
• Ultrasound
• Portable equipment
• Line drivers
Ordering Information
Part Number
Junction Temp. Range
Package
MIC918BM5
–40°C to +85°C
SOT-23-5*
MIC918BC5
–40°C to +85°C
SC-70
* Contact factory about SOT-23-5 package.
Pin Configuration
Functional Pinout
IN— V— IN+
3
2
1
IN— V— IN+
Part
Identification
3
2
1
A30
4
5
4
5
OUT
V+
OUT
V+
SOT-23-5 or SC-70
SOT-23-5 or SC-70
Pin Description
Pin Number
Pin Name
Pin Function
1
IN+
Noninverting Input
2
V–
Negative Supply (Input)
3
IN–
Inverting Input
4
OUT
Output: Amplifier Output
5
V+
Positive Supply (Input)
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
October 2001
1
MIC918
MIC918
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 .............................................
SOT-23-5 .......................................................... 260°C/W
SC-70-5 ............................................................. 450°C/W
Electrical Characteristics (±5V)
V+ = +5V, V– = –5V, VCM = 0V, RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.
Symbol
Parameter
Condition
Min
VOS
Input Offset Voltage
VOS
VOS Temperature Coefficient
IB
Input Bias Current
0.26
0.6
µA
IOS
Input Offset Current
0.04
0.3
µA
VCM
Input Common-Mode Range
CMRR > 72dB
+3.25
V
CMRR
Common-Mode Rejection Ratio
–2.5V < VCM < +2.5V
75
85
dB
PSRR
Power Supply Rejection Ratio
±3.5V < VS < ±9V
95
104
dB
AVOL
Large-Signal Voltage Gain
RL = 2k, VOUT = ±2V
65
82
dB
85
dB
3.6
V
Maximum Output Voltage Swing
Max
Units
0.43
5
mV
µV/°C
1
–3.25
RL = 100Ω, VOUT = ±1V
VOUT
Typ
positive, RL = 2kΩ
+3.0
negative, RL = 2kΩ
positive, RL = 200Ω
–3.6
+1.5
negative, RL = 200Ω, Note 5
–3.0
3.0
–2.5
V
V
–1.0
V
GBW
Unity Gain-Bandwidth Product
45
MHz
PM
Phase Margin
54
°
BW
–3dB Bandwidth
95
MHz
SR
Slew Rate
C=1.7pF, Gain=1, VOUT=5V, peak to peak,
positive SR = 450V/µs
850
V/µs
ISC
Short-Circuit Output Current
source
45
63
mA
sink
20
45
mA
IS
Supply Current
No Load
0.55
0.80
mA
Input Voltage Noise
f = 10kHz
10
nV/√Hz
Input Current Noise
f = 10kHz
0.8
pA/√Hz
Electrical Characteristics
V+ = +9V, V– = –9V, VCM = 0V, RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
VOS
Input Offset Voltage
VOS
Input Offset Voltage
Temperature Coefficient
IB
Input Bias Current
0.23
0.60
µA
IOS
Input Offset Current
0.04
0.3
µA
VCM
Input Common-Mode Range
CMRR > 75dB
+7.25
V
CMRR
Common-Mode Rejection Ratio
–6.5V < VCM < +6.5V
60
91
dB
PSRR
Power Supply Rejection Ratio
±3.5V < VS < ±9V
95
104
dB
MIC918
Condition
Min
Typ
Max
Units
0.3
5
mV
µV/°C
1
2
–7.25
October 2001
MIC918
Micrel
Symbol
Parameter
Condition
AVOL
Large-Signal Voltage Gain
RL = 2k, VOUT = ±2V
Min
Typ
75
84
dB
93
dB
7.5
V
RL = 100Ω, VOUT = ±1V
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
6.5
negative, RL = 2kΩ
GBW
Unity Gain-Bandwidth Product
PM
Phase Margin
BW
–3dB Bandwidth
SR
ISC
IS
–7.5
RL = 1kΩ
Max
–6.2
Units
V
51
MHz
55
°
AV = 2, RL = 470Ω
109
MHz
Slew Rate
C=1.7pF, Gain=1, VOUT=5V, peak to peak,
positive SR = 450V/µs
1500
V/µs
Short-Circuit Output Current
source
50
65
mA
sink
30
50
mA
Supply Current
No Load
0.55
0.8
mA
Input Voltage Noise
f = 10kHz
10
nV/√Hz
Input Current Noise
f = 10kHz
0.8
pA/√Hz
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.”
October 2001
3
MIC918
MIC918
Micrel
Typical Characteristics
Supply Current
vs. Temperature
0.35
0.30
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Offset Voltage vs.
Common-Mode Voltage
1200
1000
800
600
400
200
150
900
1000
Negative Slew Rate
vs. Supply Voltage
300
200
1000
100
NEGATIVE SLEW RATE (V/µs)
POSITIVE SLEW RATE (V/µs)
400
800
900
700
800
Positive Slew Rate
vs. Supply Voltage
500
600
700
LOAD CAPACITANCE (pF)
800
600
400
500
500
600
LOAD CAPACITANCE (pF)
Negative Slew Rate vs.
Load Capacitance
200
300
300
400
0
100
200
1000
800
900
600
700
400
500
200
300
0
700
700
600
500
400
300
200
100
0
7.40
300
250
0
0
100
V+ = ±5V
400
350
0
V+ = ±5V
4.44
5.92
-7.40
-5.92
3.40
500
450
V+ = ±9V
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2.04
2.72
Positive Slew Rate vs.
Load Capacitance
100
50
0
+85°C
Negative Slew Rate vs.
Load Capacitance
200
800
+25°C
COMMON-MODE VOLTAGE (V)
100
900
–40°C
0
1
2 3 4 5 6 7 8
SUPPLY VOLTAGE (±V)
900
1000
200
V± = ±9V
0
300
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
COMMON-MODE VOLTAGE (V)
SLEW RATE (V/µs)
SLEW RATE (V/µs)
400
0
100
SLEW RATE (V/µs)
500
0.68
1.36
+85°C
1400
600
OFFSET VOLTAGE (mV)
–40°C
+25°C
1600
V+ = ±9V
700
9
Offset Voltage vs.
Common-Mode Voltage
V± = ±5V
Positive Slew Rate vs.
Load Capacitance
800
3.8
5.1
6.4
7.7
SUPPLY VOLTAGE (V)
1.48
2.96
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-3.40
-2.72
OFFSET VOLTAGE (mV)
OFFSET VOLTAGE (mV)
Offset Voltage vs.
Common-Mode Voltage
2.2
2
V± = ±2.5V
1.8
1.6
–40°C
1.4
1.2
+25°C
1
0.8
0.6
0.4
0.2
+85°C
0
-900 -540 -180 180 540 900
COMMON-MODE VOLTAGE (V)
–40°C
700
800
0.9
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
+25°C
500
600
1
0.95
0.40
+85°C
300
400
V± = ±9V
V± = ±2.5V
0.45
-0.68
0
1.05
0.50
0.62
0.60
0.58
0.56
0.54
0.52
0.50
0.48
0.46
0.44
0.42
0.40
2.5
100
200
V± = ±5V
V± = ±5V
0.55
-2.04
-1.36
1.1
SUPPLY CURRENT (µA)
SUPPLY CURRENT (mA)
OFFSET VOLTAGE (mV)
V± = ±2.5V
1.2
1.15
V± = ±9V
-1.48
0
0.60
1.25
Supply Current
vs. Supply Voltage
-4.44
-2.96
Offset Voltage
vs. Temperature
9
1800
1600
1400
1200
1000
800
600
400
200
0
0
1
2 3 4 5 6 7 8
SUPPLY VOLTAGE (±V)
9
LOAD CAPACITANCE (pF)
MIC918
4
October 2001
MIC918
Micrel
Voltage Noise
Current Noise
6
80
CURRENT NOISE (pA/√Hz)
NOISE VOLTAGE (nV/√Hz)
90
70
60
50
40
30
20
10
0
10
October 2001
100
1000 10000 100000
FREQUENCY (Hz)
5
4
3
2
1
0
10
100
1000 10000 100000
FREQUENCY (Hz)
5
MIC918
MIC918
Micrel
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 and the SC-70 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 MIC918 with no load, dissipates power equal to the
quiescent supply current × supply voltage
Applications Information
The MIC918 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 MIC918 is stable when driving high 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. 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 MIC918 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.
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.
(
)
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 260C/W.
Max . Allowable Power Dissipation =
MIC918
6
TJ (max) − TA(max)
260W
October 2001
MIC918
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)
0.65 (0.0256) BSC
1.35 (0.053) 2.40 (0.094)
1.15 (0.045) 1.80 (0.071)
2.20 (0.087)
1.80 (0.071)
DIMENSIONS:
MM (INCH)
1.00 (0.039) 1.10 (0.043)
0.80 (0.032) 0.80 (0.032)
0.10 (0.004)
0.00 (0.000)
0.30 (0.012)
0.15 (0.006)
0.18 (0.007)
0.10 (0.004)
0.30 (0.012)
0.10 (0.004)
SC-70 (C5)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
USA
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.
© 2001 Micrel Incorporated
October 2001
7
MIC918