MICREL MIC923BC5

MIC923
Micrel
MIC923
410MHz Low-Power SC70 Op Amp
Final Information
General Description
Features
The MIC923 is a high-speed operational amplifier with a gainbandwidth product of 410MHz. The part is unity gain stable.
It has a very low 2.5mA supply current, and features the
Teeny™SC70 package.
Supply voltage range is from ±2.5V to ±9V, allowing the
MIC923 to be used in low-voltage circuits or applications
requiring large dynamic range.
The MIC923 requires a minimum gain of +2 or –1 but is stable
driving any capacitive load. It has excellent PSRR and
CMRR, making it much easier to use than most conventional
high-speed devices. Low supply voltage, low power consumption, and small packaging make the MIC923 ideal for
portable equipment. The ability to drive capacitative loads
also makes it possible to drive long coaxial cables.
•
•
•
•
•
•
410MHz gain bandwidth product
2.5mA supply current
Teeny™ SC70 packaging
2200V/µs slew rate
Drives any capacitive load
Stable with gain ≥2 or –1
Applications
•
•
•
•
•
Video
Imaging
Ultrasound
Portable equipment
Line drivers
Ordering Information
Pin Configuration
Part Number
Junction Temp. Range
Package
MIC923BC5
–40°C to +85°C
SC-70
Functional Pinout
IN–
V–
IN+
3
2
1
Part
Identification
IN–
V–
IN+
3
2
1
A40
4
5
4
5
OUT
V+
OUT
V+
SC-70
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
March 2002
1
MIC923
MIC923
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Voltage (VV+ – VV–) ........................................... 20V
Differential 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
SC70-5 (θJA) ..................................................... 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
Typ
Max
Units
VOS
Input Offset Voltage
-5
0.8
5
mV
VOS
VOS Temperature Coefficient
15
IB
Input Bias Current
1.7
4.5
µA
IOS
Input Offset Current
0.3
2
µA
VCM
Input Common-Mode Range
+3.25
V
CMRR
Common-Mode Rejection Ratio
–2.5V < VCM < +2.5V
75
80
dB
PSRR
Power Supply Rejection Ratio
±3.5V < VS < ±9V
68
87
dB
AVOL
Large-Signal Voltage Gain
RL = 2kΩ, VOUT = ±2V
65
74
dB
77
dB
3.6
V
-2
–3.25
RL = 100Ω, VOUT = ±1V
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
+3
negative, RL = 2kΩ
positive, RL = 100Ω
–3.6
+2.7
µV/°C
–3
3.0
negative, RL = 100Ω, Note 5
–2.6
V
V
–2.3
V
GBW
Gain-Bandwidth Product
CL = 1.7pF
320
MHz
SR
Slew Rate
C=1.7pF, Av =2, RL = 1MΩ, RF = 2kΩ
negative SR = 720V/µs
970
V/µs
ISC
Short-Circuit Output Current
source
65
78
mA
sink
40
47
mA
IS
Supply Current
No Load
2.5
3
mA
Input Voltage Noise
f = 10kHz
9
nV/√Hz
Input Current Noise
f = 10kHz
1.1
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
15
IB
Input Bias Current
1.7
4.5
µA
IOS
Input Offset Current
0.3
2
µA
VCM
Input Common-Mode Range
+7.25
V
CMRR
Common-Mode Rejection Ratio
–6.5V < VCM < +6.5V
58
83
dB
PSRR
Power Supply Rejection Ratio
±3.5V < VS < ±9V
68
87
dB
MIC923
Condition
Min
Typ
Max
Units
-5
0.4
5
mV
–7.25
2
µV/°C
March 2002
MIC923
Micrel
Symbol
Parameter
Condition
AVOL
Large-Signal Voltage Gain
RL = 2kΩ, VOUT = ±3V
Min
Typ
65
76
dB
86
dB
7.5
V
RL = 100Ω, VOUT = ±1V
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
7
negative, RL = 2kΩ
–7.5
Max
–7
Units
V
GBW
Gain-Bandwidth Product
CL = 1.7pF, RL = 100Ω
410
MHz
SR
Slew Rate
C=1.7pF, Av =2, RL = 1MΩ, RF = 2kΩ
positive SR = 2100V/µs
2200
V/µs
ISC
Short-Circuit Output Current
source
70
84
mA
sink
40
50
mA
IS
Supply Current
No Load
2.5
3
mA
Input Voltage Noise
f = 10kHz
9
nV/√Hz
Input Current Noise
f = 10kHz
1.1
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.”
March 2002
3
MIC923
MIC923
Micrel
Test Circuits
V+
10µF
V+
0.1µF
50Ω
R2
BNC
5k
Input
10µF
0.1µF
10k
10k
10k
2k
3
BNC
MIC923
BNC
4
R1 5k
Input
5
3
1
2
2
5k
R3
200k
Input
50Ω
All resistors:
1% metal film
Output
0.1µF
R5
5k
10µF
V–
All resistors 1%
0.1µF
R4
250Ω
 R2 R2 + R 5 + R4 
VOUT = VERROR 1 +
+


 R1
R7
10µF
V–
PSRR vs. Frequency
100pF
BNC
R6
0.1µF
BNC
4
1
R7a 100Ω
50Ω
0.1µF
MIC923
R7c 2k
R7b 200Ω
Output
5
CMRR vs. Frequency
V+
V+
10µF
10pF
R1
20Ω
10µF
3
R3 27k
S1
S2
R5
20Ω
R2 4k
3
5
0.1µF
MIC923
4
1
2
R4 27k
0.1µF
10pF
10µF
BNC
MIC923
To
Dynamic
Analyzer
VIN
300Ω
4
1
2
0.1µF
1k
50Ω
VOUT
FET Probe
CL
10µF
V–
V–
Noise Measurement
MIC923
0.1µF
5
Closed Loop Frequency Response Measurement
4
March 2002
MIC923
Micrel
Typical Characteristics
Supply Current
vs. Supply Voltage
85°C
2.4
2.35
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
2.5
2.45
2.4
2.3
-40 -20
85°C
OFFSET VOLTAGE (mV)
25°C
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
SUPPLY CURRENT (mA)
Supply Current
vs. Supply Voltage
–40°C
8
7
6
5
4
3
2
1
0
-1
-2
-3
BIAS CURRENT (µA)
OFFSET VOLTAGE (mV)
2.40
2.35
2.30
+85°C
2.25
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY VOLTAGE (V)
March 2002
OUTPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
+25°C
0.5
40
60
0
-40 -20
80 100
0
20
40
60
80 100
TEMPERATURE (°C)
LOAD CAPACITANCE (pF)
Offset Voltage
vs. Common-Mode Voltage
Offset Voltage
vs. Temperature
1.6
25°C
85°C
1.4
1.2
±2.5V
1
0.8
±5V
0.6
0.4
±9V
0.2
COMMON-MODE VOLTAGE (V)
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Bias Current
vs. Temperature
Supply Current
vs. Supply Voltage
-5 -4 -3 -2 -1 0 1 2 3 4 5
3.0
2.65
2.5
2.60
2.0
±2.5V
1.5
±5V
1.0
±9V
0.5
2.55
5.5
Sourcing
5.0
V± = ±5V
4.5
4.0
–40°C
3.5
3.0
2.5
+25°C
2.0
1.5
1.0
+85°C
0.5
0
0 9 18 27 36 45 54 63 72 81 90
OUTPUT CURRENT (mA)
5
–40°C
+25°C
2.50
2.45
+85°C
2.40
2.35
2.30
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY VOLTAGE (V)
Output Voltage
vs. Output Current
2.55
2.45
20
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (mA)
Supply Current
vs. Supply Voltage
2.50
0
–40°C
Offset Voltage
vs. Common-Mode Voltage
–40°C
±9V
1
VCC = ±5V
SUPPLY VOLTAGE (±V)
8
V± = ±9V
7
6
5
4
–40°C
25°C
3
2
1
0
85°C
-1
-2
-3
-5 -4 -3 -2 -1 0 1 2 3 4 5
COMMON-MODE VOLTAGE (V)
±5V
1.5
2.35
SUPPLY VOLTAGE (±V)
4.4
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
SLEW RATE (V/µs)
2.45
±2.5V
2.55
2
OFFSET VOLTAGE (mV)
2.5
±2.5V
±5V
2.6
SUPPLY CURRENT (mA)
25°C
2.55
2.5
±9V
2.65
Output Voltage
vs. Output Current
OUTPUT VOLTAGE (V)
2.6
Positive Slew Rate vs.
Load Capacitance
2.7
–40°C
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
2.65
Supply Current
vs. Temperature
9.9
9.0
8.1
7.2
6.3
5.4
4.5
3.6
2.7
1.8
0.9
0
Sourcing
V± = ±9V
–40°C
25°C
85°C
0 9 18 27 36 45 54 63 72 81 90
OUTPUT CURRENT (mA)
MIC923
MIC923
Micrel
Output Voltage
vs. Output Current
0
-135
-180
0
-5
-225
-270
-225
-270
-10
-15
-315
-360
±9V
±5V
±2.5V
10M
100M
FREQUENCY (Hz)
1000pF
680pF
470pF
10x10
10M6
100x106
100M
FREQUENCY (Hz)
MIC923
500x106
V± = ±9V
60
50 Gain
100Ω
40
No Load
30
20
10 Phase
0
-10
-20
-30 6
2x10
100
315
270
135
90
100Ω
45
0
-45
-90
-135
6
6
100x10
1k10x1010k 100k
1M 500x10
10M 6
FREQUENCY (Hz)
6
20
10
1.7pF
0
-10
1000pF
680pF
470pF
-20
-30
100M
10M
FREQUENCY (Hz)
Open-Loop Frequency
Response
225
180
No Load
V± = ±9V
220pF
100pF
70
GAIN BANDWIDTH (dB)
220pF
100pF
1.7pF
-20
-30
-40
-50 6
1x10
1M
70
GAIN BANDWIDTH (dB)
OPEN-LOOP GAIN (dB)
0
-10
10M
100M
FREQUENCY (Hz)
-40
-50
1M
Open-Loop Frequency
Response
V± = ±5V
20
10
-315
-360
-135
-180
Open-Loop Gain
vs. Frequency
-20
-30
Open-Loop Gain
vs. Frequency
40
30
-10
-15
1M
40
30
FREQUENCY (Hz)
90
Av = 4
V± = ±5V 45
0
-225
-270
50
-40
-50
1M
9
0
-5
40
30
0
-10
7.6
-45
-90
50
20
10
6.2
20
15 Gain Bandwidth
10
5
OPEN-LOOP GAIN (dB)
0
-5
GAIN (dB)
-180
PHASE MARGIN (°)
-90
-135
5
50
-315
-360
GAIN (dB)
10 Gain Bandwidth
5
100M
10M
FREQUENCY (Hz)
4.8
30
Phase Margin
25
Closed Loop Frequency
Response
90
Av = 4
V± = ±9V 45
0
-45
15 Gain Bandwidth
10
Av = 4
V± = ±2.5V 45
0
-45
-90
-10
-15
1M
9.0
3.4
35
PHASE MARGIN (°)
GAIN (dB)
SHORT CIRCUIT CURENT (mA)
GAIN (dB)
25
20
2
Closed Loop Frequency
Response
20
15
85°C
–40°C
3.4
4.8
6.2
7.6
SUPPLY VOLTAGE (±V)
Phase Margin
Sourcing
V± = ±9V
SUPPLY VOLTAGE (±V)
90
30
Phase Margin
25
Closed Loop Frequency
Response
35
30
0
25°C
Closed Loop Frequency
35
Sinking
25°C
-12
–40°C
85°C
OUTPUT CURRENT (mA)
Short Circuit Current
vs. Supply Voltage
6
0
-6
-12
-18
-24
-30
-36
-42
-48
-54
-60
2.0
-24
99
90
81
72
63
54
45
36
27
18
9
0
PHASE MARGIN (°)
-10
Sinking
V± = ±9V
PHASE (°)
-20
OUTPUT CURRENT (mA)
Short Circuit Current
vs. Supply Voltage
60
50 Gain
40
30
20
Phase
10
0
-10
-20
-30
2M
V± = ±5V
315
270
225
180
135
No Load
100Ω
100Ω
No Load
90
45
PHASE (°)
85°C
0.9
25°C
0
-0.9
-1.8
-2.7
85°C
-3.6
-4.5
-5.4
–40°C
-6.3
-7.2
-8.1
-9.0
-60
-48
-36
SHORT CIRCUIT CURRENT (mA)
Sinking
V± = ±5V
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
Output Voltage
vs. Output Current
0.5
0
-0.5
-1.0
-1.5
-2.0 –40°C
-2.5
25°C
-3.0
-3.5
-4.0
-4.5
-5.0
-50
-40
-30
0
-45
10M
100M
FREQUENCY (Hz)
-90
-135
March 2002
MIC923
Micrel
Functional Characteristics
Small Signal Response
INPUT
(50mV/div)
OUTPUT
(50mV/div)
V± = ±5V
Av = -1
CL = 1.7pF
RL = 1MΩ
RF = 1kΩ
Small Signal Response
Small Signal Response
OUTPUT
(50mV/div)
V± = ±9V
Av = -1
CL = 100pF
RL = 1MΩ
RF = 1kΩ
Small Signal Response
Small Signal Response
INPUT
(50mV/div)
TIME (100ns/div)
OUTPUT
(50mV/div)
OUTPUT
(50mV/div)
V± = ±5V
Av = -1
CL = 100pF
RL = 1MΩ
RF = 1kΩ
TIME (100ns/div)
INPUT
(50mV/div)
OUTPUT
(50mV/div)
INPUT
(50mV/div)
TIME (100ns/div)
V± = ±5V
Av = -1
CL = 1000pF
RL = 1MΩ
RF = 1kΩ
V± = ±9V
Av = -1
CL = 1000pF
RL = 1MΩ
RF = 1kΩ
TIME (100ns/div)
TIME (100ns/div)
March 2002
V± = ±9V
Av = -1
CL = 1.7pF
RL = 1MΩ
RF = 1kΩ
TIME (100ns/div)
INPUT
(50mV/div)
OUTPUT
(50mV/div)
INPUT
(50mV/div)
Small Signal Response
7
MIC923
MIC923
Micrel
Small Signal Response
INPUT
(50mV/div)
OUTPUT
(100mV/div)
V± = ±5V
Av = 2
CL = 1.7pF
RL = 1MΩ
RF = 2kΩ
Small Signal Response
Small Signal Response
OUTPUT
(50mV/div)
V± = ±5V
Av = 2
CL = 100pF
RL = 1MΩ
RF = 2kΩ
Small Signal Response
Small Signal Response
INPUT
(50mV/div)
TIME (100ns/div)
OUTPUT
(100mV/div)
OUTPUT
(100mV/div)
V± = ±9V
Av = 2
CL = 100pF
RL = 1MΩ
RF = 2kΩ
TIME (100ns/div)
INPUT
(50mV/div)
OUTPUT
(100mV/div)
INPUT
(50mV/div)
TIME (100ns/div)
V± = ±5V
Av = 2
CL = 1000pF
RL = 1MΩ
RF = 2kΩ
TIME (100ns/div)
MIC923
V± = ±9V
Av = 2
CL = 1.7pF
RL = 1MΩ
RF = 2kΩ
TIME (100ns/div)
INPUT
(50mV/div)
OUTPUT
(100mV/div)
INPUT
(50mV/div)
Small Signal Response
V± = ±9V
Av = 2
CL = 1000pF
RL = 1MΩ
RF = 2kΩ
TIME (100ns/div)
8
March 2002
MIC923
Micrel
Large Signal Response
OUTPUT
(1V/div)
OUTPUT
(100mV/div)
Large Signal Response
V± = ±5V
Av = 2
CL = 1.7pF
RL = 1MΩ
RF = 2kΩ
Positive Slew Rate = 970V/µs
Negative Slew Rate = 720V/µs
V± = ±9V
Av = 2
CL = 1.7pF
RL = 1MΩ
RF = 2kΩ
Positive Slew Rate = 2100V/µs
Negative Slew Rate = 2200V/µs
TIME (10ns/div)
Large Signal Response
Large Signal Response
OUTPUT
(2V/div)
OUTPUT
(100mV/div)
TIME (10ns/div)
V± = ±5V
Av = 2
CL = 100pF
RL = 1MΩ
RF = 2kΩ
Positive Slew Rate = 440V/µs
Negative Slew Rate = 340V/µs
V± = ±5V
Av = 2
CL = 100pF
RL = 1MΩ
RF = 2kΩ
Positive Slew Rate = 700V/µs
Negative Slew Rate = 500V/µs
Large Signal Response
Large Signal Response
OUTPUT
(2V/div)
TIME (25ns/div)
OUTPUT
(1V/div)
TIME (25ns/div)
V± = ±5V
Av = 2
CL = 1000pF
RL = 1MΩ
RF = 2kΩ
Positive Slew Rate = 70V/µs
Negative Slew Rate = 45V/µs
V± = ±9V
Av = 2
CL = 1000pF
RL = 1MΩ
RF = 2kΩ
Positive Slew Rate = 87V/µs
Negative Slew Rate = 57V/µs
TIME (100ns/div)
March 2002
TIME (100ns/div)
9
MIC923
MIC923
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 SC70-5 package, like all small packages, have 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 par-ticular CMRR will reduce.
An MIC923 with no load, dissipates power equal to the
quiescent supply current × supply voltage
Applications Information
The MIC923 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 MIC923 is stable when driving high capacitance, making
it ideal for driving long coaxial cables or other high-capacitance loads. 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 MIC923 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.
It is important to ensure adequate supply bypassing capacitors are located close to the device.
MIC923
(
)
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 SC70-5
package has a thermal resistance of 450°C/W.
Max. AllowablePowerDissipation =
10
TJ(max) − TA(max)
450°C / W
March 2002
MIC923
Micrel
Package Information
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)
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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.
© 2002 Micrel Incorporated
March 2002
11
MIC923