March 2002
1
MIC923
MIC923
Micrel
MIC923
410MHz Low-Power SC70 Op Amp
Final Information
General Description
The MIC923 is a high-speed operational amplifier with a gain-
bandwidth product of 410MHz. The part is unity gain stable.
It has a very low 2.5mA supply current, and features the
TeenyTMSC70 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 con-
sumption, 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.
Features
410MHz gain bandwidth product
2.5mA supply current
TeenyTM SC70 packaging
2200V/
s slew rate
Drives any capacitive load
Stable with gain
2 or 1
Applications
Video
Imaging
Ultrasound
Portable equipment
Line drivers
Ordering Information
Part Number
Junction Temp. Range
Package
MIC923BC5
40
C to +85
C
SC-70
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
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)
Pin Configuration
IN+
V
OUT
IN
1
3
4
5
2
V+
A40
Part
Identification
SC-70
Functional Pinout
IN+
V
OUT
IN
1
3
4
5
2
V+
SC-70
MIC923
Micrel
MIC923
2
March 2002
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
V+
V
V
) ........................................... 20V
Differential Input Voltage (
V
IN+
V
IN
) .......... 4V, Note 3
Input Common-Mode Range (V
IN+
, V
IN
) .......... V
V+
to V
V
Lead Temperature (soldering, 5 sec.) ....................... 260
C
Storage Temperature (T
S
) ........................................ 150
C
ESD Rating, Note 4 ................................................... 1.5kV
Operating Ratings
(Note 2)
Supply Voltage (V
S
) .......................................
2.5V to
9V
Junction Temperature (T
J
) ......................... 40
C to +85
C
Package Thermal Resistance
SC70-5
(
JA
) ..................................................... 450
C/W
Electrical Characteristics (
5V)
V+ = +5V, V = 5V, V
CM
= 0V, R
L
= 10M
; T
J
= 25
C, bold values indicate 40
C
T
J
+85
C; unless noted.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
OS
Input Offset Voltage
-5
0.8
5
mV
V
OS
V
OS
Temperature Coefficient
15
V/
C
I
B
Input Bias Current
1.7
4.5
A
I
OS
Input Offset Current
-2
0.3
2
A
V
CM
Input Common-Mode Range
3.25
+3.25
V
CMRR
Common-Mode Rejection Ratio
2.5V < V
CM
< +2.5V
75
80
dB
PSRR
Power Supply Rejection Ratio
3.5V < V
S
<
9V
68
87
dB
A
VOL
Large-Signal Voltage Gain
R
L
= 2k
, V
OUT
=
2V
65
74
dB
R
L
= 100
, V
OUT
=
1V
77
dB
V
OUT
Maximum Output Voltage Swing
positive, R
L
= 2k
+3
3.6
V
negative, R
L
= 2k
3.6
3
V
positive, R
L
= 100
+2.7
3.0
V
negative, R
L
= 100
, Note 5
2.6
2.3
V
GBW
Gain-Bandwidth Product
C
L
= 1.7pF
320
MHz
SR
Slew Rate
C=1.7pF, Av =2, R
L
= 1M
, R
F
= 2k
970
V/
s
negative SR = 720V/
s
I
SC
Short-Circuit Output Current
source
65
78
mA
sink
40
47
mA
I
S
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, V
CM
= 0V, R
L
= 10M
; T
J
= 25
C, bold values indicate 40
C
T
J
+85
C; unless noted
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
OS
Input Offset Voltage
-5
0.4
5
mV
V
OS
Input Offset Voltage
15
V/
C
Temperature Coefficient
I
B
Input Bias Current
1.7
4.5
A
I
OS
Input Offset Current
0.3
2
A
V
CM
Input Common-Mode Range
7.25
+7.25
V
CMRR
Common-Mode Rejection Ratio
6.5V < V
CM
< +6.5V
58
83
dB
PSRR
Power Supply Rejection Ratio
3.5V < V
S
<
9V
68
87
dB
March 2002
3
MIC923
MIC923
Micrel
Symbol
Parameter
Condition
Min
Typ
Max
Units
A
VOL
Large-Signal Voltage Gain
R
L
= 2k
, V
OUT
=
3V
65
76
dB
R
L
= 100
, V
OUT
=
1V
86
dB
V
OUT
Maximum Output Voltage Swing
positive, R
L
= 2k
7
7.5
V
negative, R
L
= 2k
7.5
7
V
GBW
Gain-Bandwidth Product
C
L
= 1.7pF, R
L
= 100
410
MHz
SR
Slew Rate
C=1.7pF, Av =2, R
L
= 1M
, R
F
= 2k
2200
V/
s
positive SR = 2100V/
s
I
SC
Short-Circuit Output Current
source
70
84
mA
sink
40
50
mA
I
S
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."
MIC923
Micrel
MIC923
4
March 2002
Test Circuits
2k
10k
10k
10k
0.1
F
0.1
F
0.1
F
10
F
50
50
50
0.1
F
10
F
All resistors:
1% metal film
Output
Input
Input
V+
V
MIC923
4
5
3
1
2
BNC
BNC
BNC
PSRR vs. Frequency
R2 4k
S2
S1
0.1
F
10
F
0.1
F
10
F
10pF
10pF
V+
V
MIC923
4
5
3
1
2
BNC
R4 27k
R3 27k
R1
20
R5
20
100pF
To
Dynamic
Analyzer
Noise Measurement
0.1
F
10
F
0.1
F
10
F
V+
V
MIC923
4
5
3
1
2
BNC
R7c 2k
R7b 200
R7a 100
Input
R6
5k
R2
5k
R3
200k
R4
250
R5
5k
Output
R1 5k
BNC
All resistors 1%
V
V
R2
R1
R2
R
R4
OUT
ERROR
=
+
+
+
+
1
5
R7
CMRR vs. Frequency
V+
V
IN
V
MIC923
4
5
3
1
2
300
50
V
OUT
FET Probe
1k
C
L
0.1
F
10
F
0.1
F
10
F
Closed Loop Frequency Response Measurement
March 2002
5
MIC923
MIC923
Micrel
Typical Characteristics
2.35
2.4
2.45
2.5
2.55
2.6
2.65
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (
V)
Supply Current
vs. Supply Voltage
40
C
25
C
85
C
2.3
2.35
2.4
2.45
2.5
2.55
2.6
2.65
2.7
-40 -20
0
20
40
60
80 100
SUPPLY CURRENT (mA)
TEMPERATURE (
C)
Supply Current
vs. Temperature
9V
2.5V
5V
0
0.5
1
1.5
2
2.5
-40 -20
0
20
40
60
80 100
SLEW RATE (V/
s)
LOAD CAPACITANCE (pF)
Positive Slew Rate vs.
Load Capacitance
5V
9V
2.5V
-3
-2
-1
0
1
2
3
4
5
6
7
8
-5 -4 -3 -2 -1 0
1
2
3
4
5
OFFSET VOLTAGE (mV)
COMMON-MODE VOLTAGE (V)
Offset Voltage
vs. Common-Mode Voltage
V
CC
=
5V
85
C
40
C
25
C
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
-40 -20
0
20
40
60
80 100
OFFSET VOLTAGE (mV)
TEMPERATURE (
C)
Offset Voltage
vs. Temperature
2.5V
5V
9V
-3
-2
-1
0
1
2
3
4
5
6
7
8
-5 -4 -3 -2 -1 0
1
2
3
4
5
OFFSET VOLTAGE (mV)
COMMON-MODE VOLTAGE (V)
Offset Voltage
vs. Common-Mode Voltage
V
=
9V
40
C
85
C
25
C
0
0.5
1.0
1.5
2.0
2.5
3.0
-40 -20
0
20
40
60
80 100
BIAS CURRENT (
A)
TEMPERATURE (mA)
Bias Current
vs. Temperature
9V
2.5V
5V
2.30
2.35
2.40
2.45
2.50
2.55
2.60
2.65
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (V)
Supply Current
vs. Supply Voltage
40
C
+85
C
+25
C
0
0.9
1.8
2.7
3.6
4.5
5.4
6.3
7.2
8.1
9.0
9.9
0
9 18 27 36 45 54 63 72 81 90
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current
Sourcing
V
=
9V
40
C
25
C
85
C
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
9 18 27 36 45 54 63 72 81 90
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current
40
C
+85
C
+25
C
Sourcing
V
=
5V
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (V)
Supply Current
vs. Supply Voltage
40
C
+85
C
+25
C
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
4.4
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 VOLTAGE (
V)
Supply Current
vs. Supply Voltage
40
C
25
C
85
C
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