Micrel MIC922 230mhz low-power sc-70 op amp Datasheet

MIC922
Micrel, Inc.
MIC922
230MHz Low-Power SC-70 Op Amp
General Description
Features
The MIC922 is a high-speed operational amplifier with a
gain-bandwidth product of 230MHz. The part is unity gain
stable. It has a very low 2.5mA supply current, and features
the Teeny™ SC-70 package.
Supply voltage range is from ±2.5V to ±9V, allowing the
MIC922 to be used in low-voltage circuits or applications
requiring large dynamic range.
The MIC922 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 MIC922 ideal for portable equipment. The ability
to drive capacitative loads also makes it possible to drive
long coaxial cables.
•
•
•
•
•
•
•
230MHz gain bandwidth product
400MHz –3dB bandwidth
2.5mA supply current
SC-70 package
1500V/µs slew rate
Drives any capacitive load
Unity gain stable
Applications
•
•
•
•
•
Video
Imaging
Ultrasound
Portable equipment
Line drivers
Ordering Information
Part Number
Standard
MIC922BC5
Marking
A39
Pb-Free
MIC922YC5
Marking
A39
Ambient Temperature
Package
–40ºC to +85ºC
SC-70-5
Functional Pinout
Pin Configuration
IN– V– IN+
2
3
1
A39
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) 474-100 • http://www.micrel.com
May 2006
1
MIC922
MIC922
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
SC-70-5 (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
negative, RL = 100Ω, Note 5
V
–3
V
–2.3
V
3.0
–2.6
V
CL = 1.7pF
200
MHz
49
°
Av = 1, CL = 1.7pF
320
MHz
420
V/µs
78
mA
GBW
Unity Gain-Bandwidth Product
PM
Phase Margin
BW
–3dB Bandwidth
SR
Slew Rate
C=1.7pF, Gain=1, VOUT=4VPP
negative SR = 360V/µs
ISC
Short-Circuit Output Current
source
65
sink
40
IS
Supply Current
No Load
2.5
Input Voltage Noise
f = 10kHz
9
V/√Hz
Input Current Noise
f = 10kHz
1.1
A/√Hz
CL = 1.7pF
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
Condition
Min
Typ
Max
Units
-5
0.4
5
mV
Input Offset Voltage
Temperature Coefficient
15
µV/°C
Input Bias Current
1.7
4.5
µA
IOS
Input Offset Current
0.3
2
µA
CMRR
Common-Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
IB
VCM
MIC922
–7.25
Input Common-Mode Range
–6.5V < VCM < +6.5V
±3.5V < VS < ±9V
2
+7.25
V
58
83
dB
68
87
dB
May 2006
MIC922
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
Unity Gain-Bandwidth Product
PM
Phase Margin
BW
–3dB Bandwidth
SR
Slew Rate
C=1.7pF, Av =1, VOUT=8VPP,
positive SR = 750V/µs
ISC
Short-Circuit Output Current
source
70
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
RL = 100Ω, VOUT = ±1V
negative, RL = 2kΩ
7.5
–7.5
CL = 1.7pF
CL = 1.7pF
AV = 1, CL = 1.7pF
Max
Units
V
–7
V
230
MHz
44
°
400
MHz
1500
V/µs
84
mA
50
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
MIC922
MIC922
Micrel, Inc.
Test Circuits
V+
10µF
Input
BNC
V+
0.1µF
50Ω
R2
5k
0.1µF
10k
10k
10k
2k
3
1
5
MIC922
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
MIC922
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
MIC922
2
10pF
4
0.1µF
BNC
To
Dynamic
Analyzer
VIN
0.1µF
MIC922
2
4
0.1µF
50Ω
300Ω
VOUT
FET Probe
CL
10µF
10µF
V–
V–
Noise Measurement
MIC922
1
5
Closed Loop Frequency Response Measurement
4
May 2006
MIC922
Micrel, Inc.
Typical Characteristics
85°C
2.30
2.25
2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
SUPPLY VOLTAGE (V)
85°C
2.0
2.7
3.4
4.1
4.8
5.5
6.2
6.9
7.6
8.3
9.0
25°C
SUPPLY VOLTAGE ±V)
(
V± = ±9V
25°C
–40°C
85°C
Output Voltage
vs. Output Current
Output Voltage
vs. Output Current
OUTPUT VOLTAGE (V)
0.5
Sinking
0
V± = ±5V
-0.5
-1.0
-1.5
-2.0 –40°C
-2.5
25°C
-3.0
-3.5
-4.0
85°C
-4.5
-5.0
-50-45-40-35-30-25-20-15-10 -5 0
OUTPUT CURRENT (mA)
6
0
-6
-12
-18
-24
-30
-36
-42
-48
-54
-60
NOISE VOLTAGE (nV/HZ)
–40°C
Output Voltage
vs. Output Current
5.5
5.0 Sourcing
V± = ±5V
4.5
4.0
3.5
3.0
2.5
–40°C
2.0
1.5
85°C
1.0
0.5
25°C
0
0 10 20 30 40 50 60 70 80
OUTPUT CURRENT (mA)
-9.0
-7.2
-5.4
-3.6
-1.8
0
1.8
3.6
5.4
7.2
9.0
OFFSET VOLTAGE (mV)
OFFSET VOLTAGE (mV)
OUTPUT VOLTAGE (V)
Short-Circuit Current
vs. Supply Voltage
99
90 Sourcing
81
72
63
54
45
36
27
18
9
0
8
7
6
5
4
3
2
1
0
-1
-2
-3
COMMON-MODE VOLTAGE (V)
Output Voltage
vs. Output Current
9.9
9.0 Sourcing
V± = ±9V
8.1
7.2
6.3
–40°C
5.4
4.5
3.6
2.7
+25°C
1.8
+85°C
0.9
0
0 10 20 30 40 50 60 70 80 90
OUTPUT CURRENT (mA)
0
-40 -20 0 20 40 60 80 100
TEMPERATURE °C)
(
Offset Voltage
vs. Common-Mode Voltage
Offset Voltage
vs. Common-Mode Voltage
8
7 V± = ±5V
25°C
6
5
4
–40°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)
V± = ±9V
0.2
OUTPTU VOLTAGE (V)
2.25
-40 -20 0 20 40 60 80 100
TEMPERATURE °C)
(
V± = ±5V
0.4
OUTPUT VOLTAGE (V)
V± = ±2.5V
2.30
SHORT-CIRCUIT CURRENT (mA)
0.6
2.35
2.35
V± = ±2.5V
1
0.8
2.40
2.40
May 2006
25°C
2.45
V± = ±5V
Offset Voltage
vs. Temperature
1.2
Short Circuit Current
vs. Supply Voltage
Sinking
0.9
Sinking
0.0
V± = ±9V
-0.9
-1.8
25°C
-2.7
-3.6
-4.5
-5.4 –40°C
-6.3
-7.2
-8.1
85°C
-9.0
-60-54-48-42-36-30-24-18-12 -6 0
OUTPUT CURRENT (mA)
3
Bias Current
vs. Temperature
2.5
25°C
–40°C
SUPPLY VOLTAGE ±V)
(
5
V± = ±2.5V
2
1.5
85°C
2.0
2.7
3.4
4.1
4.8
5.5
6.2
6.9
7.6
8.3
9.0
2.45
1.4
OFFSET VOLTAGE (mV)
2.50
2.55
2.50
–40°C
2.55
V± = ±9V
2.60
2.60
INPUT BIAS CURRENT (µA)
2.65
Supply Current
vs. Supply Voltage
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
2.70
Supply Current
vs. Temperature
V± = ±5V
1
0.5
V± = ±9V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE °C)
(
MIC922
MIC922
Micrel, Inc.
SUPPLY VOLTAGE ±V)
(
Gain Bandwidth and Phase
Margin vs. Load
100
45
50
0
0
POSITIVE SLEW RATE (V/µs)
800
700
Gain Bandwidth
40
150
45
100
40
50
35
200 400 600 800 1000
LOAD CAPACITANCE (pF)
0
0
Positive Slew Rate
1400
V± = ±9V
500
400
300
200
150
50
150
100
50
200 400 600 800 1000
LOAD CAPACITANCE (pF)
CLOSED-LOOP GAIN (dB)
SLEW RATE (V/µs)
200
0
0
100
200
300
400
500
600
700
800
900
1000
0
100
200
300
400
500
600
700
800
900
1000
100
Closed Loop Gain
vs. Frequency
250
PHASE MARGIN (°)
200
Negative Slew Rate
300
MIC922
250
LOAD CAPACITANCE (pF)
100
90
80
70
60
50
40
30
20
10
0
1x10
1M6
V± = ±5V
300
LOAD CAPACITANCE (pF)
V± = ±5V
Positive Slew Rate
350
400
0
450
400
600
0
0
0
V± = ±9V
800
200
350
Negative Slew Rate
1000
100
400
30
200 400 600 800 1000
LOAD CAPACITANCE (pF)
1200
SLEW RATE (V/µs)
600
35
Gain Bandwidth
50
49
Phase Margin
48
220
47
210 Gain Bandwidth
46
200
45
190
44
180
43
170
42
160
41
40
150
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE ±V)
(
230
0
100
200
300
400
500
600
700
800
900
1000
50
50
Phase Margin
240
55
GAIN BANDWIDTH (MHz)
150
200
V± = ±5V
SLEW RATE (V/µs)
55
250
V± = ±5V
1.7pF
220pF
100pF
1000pF
800pF
600pF
6
10x10
100x10
100M
10M6
FREQUENCY (Hz)
6
500x106
LOAD CAPACITANCE (pF)
CLOSED-LOOP GAIN (dB)
Phase Margin
60
180
135
90
45
0
-45
-90
-135
-180
-225
-270
Gain Bandwidth and Phase
Margin vs. Supply Voltage
Gain Bandwidth and Phase
Margin vs. Load
GAIN BANDWIDTH (MHz)
200
V± = ±9V
PHASE MARGIN (°)
GAIN BANDWIDTH (MHz)
250
Open-Loop Frequency
Response
60
RL = 100Ω
50 Phase
40
No Load
30
20 Gain
10
0
RL = 100Ω
-10
-20
-30
V± = ±5V
-40
100M
10M
1M
CAPACITIVE LOAD (pF)
PHASE MARGIN (°)
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
85°C
PHASE MARGIN (°)
25°C
180
135
90
45
0
-45
-90
-135
-180
-225
-270
PHASE MARGIN (°)
GAIN BANDWIDTH (MHz)
BIAS CURRENT (±V)
–40°C
60
50 Phase Margin RL = 100Ω
40
No Load
30
20
10 Gain Bandwidth
0
RL = 100Ω
-10
-20
-30
V± = ±9V
-40
100M
10M
1M
CAPACITIVE LOAD (pF)
GAIN BANDWIDTH (MHz)
Open-Loop Frequency
Response
Bias 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
30
20
10
0
-10
-20
-30
-40
-50
-60
-70 6
1x10
1M
Closed-Loop Gain
vs. Frequency
V± = ±9V
1.7pF
100pF
1000pF
800pF
220pF
400pF
600pF
10x10
100x10
100M6
10M6
FREQUENCY (Hz)
500x106
May 2006
Micrel, Inc.
60
50
40
30
20
10
0
-10
-20
-30
-40
1M
May 2006
Open-Loop Gain
vs. Frequency
V± = ±5V
1.7pF
50pF
100pF
225pF
1000pF
675pF
450pF
10M
100M
FREQUENCY (Hz)
60
50
40
30
20
10
0
-10
-20
-30
-40
1M
OPEN-LOOP GAIN (dB)
OPEN-LOOP GAIN (dB)
MIC922
Open-Loop Gain
vs. Frequency
V± = ±9V
1.7pF
50pF
100pF
225pF
450pF
675pF
1000pF
100M
10M
FREQUENCY (Hz)
7
MIC922
MIC922
Micrel, Inc.
Functional Characteristics
INPUT
(50mV/div)
Small Signal Response
V± = ±5.0V
Av = 1
CL = 1.7µF
RL = 1MΩ
OUTPUT
(50mV/div)
Small Signal Response
Small Signal Response
INPUT
(50mV/div)
TIME (100ns/div)
TIME (100ns/div)
Small Signal Response
Small Signal Response
INPUT
(50mV/div)
TIME (100ns/div)
V± = ±5.0V
Av = 1
CL = 1000pF
RL = 1MΩ
V± = ±9.0V
Av = 1
CL = 1000pF
RL = 1MΩ
OUTPUT
(50mV/div)
OUTPUT
(50mV/div)
INPUT
(50mV/div)
V± = ±9.0V
Av = 1
CL = 100pF
RL = 1MΩ
OUTPUT
(50mV/div)
V± = ±5.0V
Av = 1
CL = 100pF
RL = 1MΩ
TIME (100ns/div)
MIC922
V± = ±9.0V
Av = 1
CL = 1.7µF
RL = 1MΩ
TIME (100ns/div)
OUTPUT
(50mV/div)
INPUT
(50mV/div)
OUTPUT
(50mV/div)
INPUT
(50mV/div)
Small Signal Response
TIME (100ns/div)
8
May 2006
MIC922
Micrel, Inc.
Large Signal Response
OUTPUT
(1V/div)
OUTPUT
(2V/div)
Large Signal Response
V± = ±5.0V
Av = 1
CL = 1.7µF
RL = 1MΩ
Positive Slew Rate = 418V/µs
Negative Slew Rate = 356V/µs
V± = ±9.0V
Av = 1
CL = 1.7µF
RL = 1MΩ
Positive Slew Rate = 747V/µs
Negative Slew Rate = 1320V/µs
Large Signal Response
Large Signal Response
OUTPUT
(2V/div)
TIME (25ns/div)
OUTPUT
(1V/div)
TIME (25ns/div)
V± = ±5.0V
Av = 1
CL = 100pF
RL = 1MΩ
Positive Slew Rate = 350V/µs
Negative Slew Rate = 303V/µs
V± = ±9.0V
Av = 1
CL = 100pF
RL = 1MΩ
Positive Slew Rate = 274V/µs
Negative Slew Rate = 274V/µs
TIME (25ns/div)
Large Signal Response
Large Signal Response
OUTPUT
(1V/div)
OUTPUT
(2V/div)
TIME (25ns/div)
V± = ±9.0V
Av = 1
CL = 1000pF
RL = 1MΩ
Positive Slew Rate = 78V/µs
Negative Slew Rate = 51V/µs
V± = ±5.0V
Av = 1
CL = 1000pF
RL = 1MΩ
Positive Slew Rate = 106V/µs
Negative Slew Rate = 66V/µs
TIME (250ns/div)
May 2006
TIME (250ns/div)
9
MIC922
MIC922
Micrel, Inc.
Applications Information
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
resis-tance). Surface-mount ceramic capacitors are ideal.
Thermal Considerations
The SC70-5 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 par-ticular CMRR will reduce.
An MIC922 with no load, dissipates power equal to the quiescent supply current × supply voltage
PD(no load) = (VV+ – VV-)IS
The MIC922 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 MIC922 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/Capacitor Selection
Conventional op amp gain configurations and resistor selection apply, the MIC922 is NOT a current feedback device.
Also, for minimum peaking, the feedback resistor should
have low parasitic capacitance. To use the part as a follower,
the output should be connected to input via a short wire. At
high frequency, the parasitic capacitance at the input might
cause peaking in the closed-loop frequency response. A
1pF capacitor should be used across the feedback resistor
to compensate for this parasitic peaking.
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.
MIC922
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+ – VVOUT)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 =
450°C/W
10
May 2006
MIC922
Micrel, Inc.
Package Information
SC-70 (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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MIC922
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