MICREL MIC923_06

MIC923
Micrel, Inc.
MIC923
410MHz Low-Power SC70 Op Amp
General Description
Features
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 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 highspeed devices. Low supply voltage, low power consumption,
and small packaging makes 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
Part Number
Standard
MIC923BC5
Marking
A40
Pb-Free
MIC923YC5
Marking
A40
Ambient Temperature
Package
–40ºC to +85ºC
SC-70-5
Functional Pinout
Pin Configuration
IN– V– IN+
2
3
1
A40
4
5
OUT
V+
IN–
Part
Identification
V– IN+
2
3
1
4
5
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)
Teeny is a trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2006
1
MIC923
MIC923
Micrel, Inc.
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
VOS
Input Offset Voltage
IB
Input Bias Current
VOS
VOS Temperature Coefficient
IOS
Input Offset Current
VCM
Condition
CMRR
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
AVOL
Large-Signal Voltage Gain
VOUT
Maximum Output Voltage Swing
Typ
Max
Units
-5
0.8
5
mV
15
1.7
-2
0.3
–3.25
Input Common-Mode Range
PSRR
Min
–2.5V < VCM < +2.5V
µV/°C
4.5
µA
2
µA
+3.25
V
75
80
dB
68
87
dB
RL = 2kΩ, VOUT = ±2V
65
74
dB
77
dB
positive, RL = 2kΩ
+3
±3.5V < VS < ±9V
RL = 100Ω, VOUT = ±1V
negative, RL = 2kΩ
positive, RL = 100Ω
3.6
–3.6
+2.7
V
–3
V
–2.3
V
3.0
V
negative, RL = 100Ω, Note 5
–2.6
320
MHz
970
V/µs
78
mA
CL = 1.7pF
GBW
Gain-Bandwidth Product
SR
Slew Rate
C=1.7pF, Av =2, RL = 1MΩ, RF = 2kΩ
negative SR = 720V/µs
ISC
Short-Circuit Output Current
source
65
sink
40
IS
Supply Current
No Load
2.5
Input Voltage Noise
f = 10kHz
9
nV/√Hz
Input Current Noise
f = 10kHz
1.1
pA/√Hz
47
mA
3
mA
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
IOS
VCM
Min
Typ
Max
Units
-5
0.4
5
mV
Input Offset Current
0.3
–7.25
Input Common-Mode Range
CMRR
Common-Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
MIC923
Condition
–6.5V < VCM < +6.5V
±3.5V < VS < ±9V
2
µV/°C
4.5
µA
2
µA
+7.25
V
58
83
dB
68
87
dB
May 2006
MIC923
Micrel, Inc.
Symbol
Parameter
Condition
Min
Typ
AVOL
Large-Signal Voltage Gain
RL = 2kΩ, VOUT = ±3V
65
76
dB
86
dB
VOUT
Maximum Output Voltage Swing
positive, RL = 2kΩ
7
GBW
Gain-Bandwidth Product
SR
Slew Rate
ISC
Short-Circuit Output Current
IS
Supply Current
No Load
2.5
Input Voltage Noise
f = 10kHz
9
nV/√Hz
Input Current Noise
f = 10kHz
1.1
pA/√Hz
RL = 100Ω, VOUT = ±1V
Max
7.5
Units
V
–7
negative, RL = 2kΩ
–7.5
410
MHz
C=1.7pF, Av =2, RL = 1MΩ, RF = 2kΩ
positive SR = 2100V/µs
2200
V/µs
84
mA
CL = 1.7pF, RL = 100Ω
source
70
sink
40
50
V
mA
3
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.”
May 2006
3
MIC923
MIC923
Micrel, Inc.
Test Circuits
V+
10µF
Input
BNC
V+
0.1µF
50Ω
R2
5k
0.1µF
10k
10k
10k
2k
3
1
5
MIC923
4
BNC
Input
Output
R1 5k
BNC
Input
3
R7c 2k
2
1
R7b 200Ω
R7a 100Ω
50Ω
5k
50Ω
All resistors:
1% metal film
R3
200k
0.1µF
All resistors 1%
10µF
0.1µF
2
4
BNC
Output
0.1µF
R5
5k
10µF
V–
R4
250Ω
 R2 R2 + R 5 + R4 
VOUT = VERROR 1 +
+

 R1

R7
V–
PSRR vs. Frequency
100pF
5
MIC923
R6
0.1µF
BNC
10µF
CMRR vs. Frequency
V+
V+
10µF
10pF
R1
20Ω
R3 27k
S1
S2
R5
20Ω
R2 4k
3
3
1
R4 27k
10µF
5
0.1µF
MIC923
2
10pF
4
0.1µF
BNC
To
Dynamic
Analyzer
VIN
0.1µF
MIC923
2
300Ω
4
0.1µF
50Ω
1k
VOUT
FET Probe
CL
10µF
10µF
V–
V–
Noise Measurement
MIC923
1
5
Closed Loop Frequency Response Measurement
4
May 2006
MIC923
Micrel, Inc.
Typical Characteristics
2.7
2.35
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY VOLTAGE ±V)
(
2.45
2.4
SUPPLY CURRENT (mA)
–40°C
25°C
85°C
2.3
-40 -20 0 20 40 60 80 100
TEMPERATURE °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
25°C
+25°C
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)
±2.5V
1
0.8
±5V
0.6
85°C
0.4
±9V
0.2
3.0
0
-40 -20 0 20 40 60 80 100
TEMPERATURE °C)
(
2.65
2.60
BIAS CURRENT (µA)
2.5
2.55
2.0
±5V
1.0
±9V
0.5
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (mA)
Output Voltage
vs. Output Current
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
Supply Current
vs. Supply Voltage
–40°C
+25°C
2.50
±2.5V
1.5
OUTPUT VOLTAGE (V)
OFFSET VOLTAGE (mV)
SUPPLY CURRENT (mA)
2.45
–40°C
Offset Voltage
vs. Temperature
1.2
–40°C
Bias Current
vs. Temperature
Supply Current
vs. Supply Voltage
1.6
1.4
Offset Voltage
vs. Common-Mode Voltage
2.50
May 2006
VCC = ±5V
SUPPLY VOLTAGE ±V)
(
2.55
0
-40 -20 0 20 40 60 80 100
LOAD CAPACITANCE (pF)
Offset Voltage
vs. Common-Mode Voltage
-5 -4 -3 -2 -1 0 1 2 3 4 5
COMMON-MODE 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)
±9V
1
0.5
2.35
8
7
6
5
4
3
2
1
0
-1
-2
-3
±5V
1.5
2.5
Supply Current
vs. Supply Voltage
4.4
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
±2.5V
2.55
±2.5V
2
SLEW RATE (V/µs)
85°C
2.4
±5V
2.6
OFFSET VOLTAGE (mV)
2.45
2.5
SUPPLY CURRENT (mA)
2.5
Positive Slew Rate vs.
Load Capacitance
±9V
2.65
2.45
2.40
+85°C
2.35
2.30
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY VOLTAGE (V)
9.9
9.0
8.1
7.2
6.3
5.4
4.5
3.6
2.7
1.8
0.9
0
OUTPUT VOLTAGE (V)
25°C
2.55
SUPPLY CURRENT (mA)
–40°C
2.6
Supply Current
vs. Temperature
OFFSET VOLTAGE (mV)
SUPPLY CURRENT (mA)
2.65
Supply Current
vs. Supply Voltage
Output Voltage
vs. Output Current
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, Inc.
Output Voltage
vs. Output Current
Short Circuit Current
vs. Supply Voltage
–40°C
3.4 4.8 6.2 7.6
SUPPLY VOLTAGE ±V)
(
9.0
90
Av = 4
V± = ±9V 45
0
-45
-90
-135
-180
-225
-270
-315
-360
MIC923
±5V
±2.5V
100M
10M
FREQUENCY (Hz)
1000pF
680pF
470pF
500x106
6
GAIN BANDWIDTH (dB)
220pF
100pF
1.7pF
70
315
V± = ±9V
60
270
50 Gain
225
100Ω
40
180
No Load
30
135
20
90
10 Phase No Load
45
100Ω
0
0
-10
-45
-20
-90
-30 6
-135
6
6
2x10
100x10
100
1k10x1010k 100k
1M 500x10
10M6
FREQUENCY (Hz)
2
3.4 4.8 6.2 7.6
SUPPLY VOLTAGE ±V)
(
9
50
40
30
20
10
0
-10
-20
-30
-40
-50
1M
90
45
0
-45
-90
-135
-180
-225
-270
-315
-360
Open-Loop Gain
vs. Frequency
V± = ±9V
220pF
100pF
1.7pF
1000pF
680pF
470pF
100M
10M
FREQUENCY (Hz)
Open-Loop Frequency
Response
Open-Loop Frequency
Response
V± = ±5V
10x10
100x106
10M6
100M
FREQUENCY (Hz)
±9V
PHASE (°)
50
40
30
20
10
0
-10
-20
-30
-40
-50 6
1x10
1M
Open-Loop Gain
vs. Frequency
GAIN BANDWIDTH (dB)
OPEN-LOOP GAIN (dB)
FREQUENCY (Hz)
50
40
30
20
10
0
-10
-20
-30
-40
-50
1M
Sourcing
V± = ±9V
Closed Loop Frequency
Response
Closed Loop Frequency
Response
GAIN (dB)
35
30
Phase Margin
25
20
15 Gain Bandwidth
10
5
0
-5
-10
-15
PHASE MARGIN (°)
GAIN (dB)
Closed Loop Frequency
Response
25°C
35
Av = 4
30
V± = ±5V
Phase Margin
25
20
15 Gain Bandwidth
10
5
0
-5
-10
-15
1M
10M
100M
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
85°C
PHASE MARGIN (°)
GAIN (dB)
Sinking
25°C
SHORT CIRCUIT CURRENT (mA)
Closed Loop Frequency
90
35
Av = 4
45
30
V±
=
±2.5V
Phase Margin
0
25
-45
20
-90
15
-135
10 Gain Bandwidth
-180
5
-225
0
-270
-5
-315
-10
-360
-15
1M
100M
10M
FREQUENCY (Hz)
–40°C
85°C
GAIN (dB)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
SHORT CIRCUIT CURENT (mA)
6
0
-6
-12
-18
-24
-30
-36
-42
-48
-54
-60
2.0
99
90
81
72
63
54
45
36
27
18
9
0
Short Circuit Current
vs. Supply Voltage
PHASE MARGIN (°)
0.9
25°C
Sinking
0
V± = ±9V
-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 -24 -12
0
OUTPUT CURRENT (mA)
70
V± = ±5V
60
50 Gain
40
No Load
30
100Ω
20
Phase
100Ω
10
No Load
0
-10
-20
-30
10M
100M
2M
FREQUENCY (Hz)
315
270
225
180
135
90
45
0
-45
-90
-135
PHASE (°)
Output Voltage
vs. Output Current
0.5
Sinking
0
V± = ±5V
-0.5
-1.0
-1.5
-2.0 –40°C
-2.5
25°C
-3.0
-3.5
85°C
-4.0
-4.5
-5.0
-50 -40 -30 -20 -10
0
OUTPUT CURRENT (mA)
May 2006
MIC923
Micrel, Inc.
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± = ±5V
Av = -1
CL = 100pF
RL = 1MΩ
RF = 1kΩ
TIME (100ns/div)
Small Signal Response
Small Signal Response
INPUT
(50mV/div)
OUTPUT
(50mV/div)
OUTPUT
(50mV/div)
V± = ±9V
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
TIME (100ns/div)
May 2006
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
V± = ±9V
Av = -1
CL = 1000pF
RL = 1MΩ
RF = 1kΩ
TIME (100ns/div)
7
MIC923
MIC923
Micrel, Inc.
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
May 2006
MIC923
Micrel, Inc.
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)
May 2006
TIME (100ns/div)
9
MIC923
MIC923
Micrel, Inc.
Applications Information
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
resis-tance). 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
PD(no load) = (VV+ – VV–)IS
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, par-ticularly
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
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.
TJ(max) – TA(max)
Max. Allowable Power Dissipation =
450ºC/W
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May 2006
MIC923
Micrel, Inc.
Package Information
SC70 (C5)
MICREL INC.
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2002 Micrel, Inc.
May 2006
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MIC923