MIC920
80 MHz Low-Power SC70 Op Amp
Features
General Description
•
•
•
•
•
•
•
The MIC920 is a high-speed operational amplifier with
a gain-bandwidth product of 80 MHz. The part is unity
gain stable. It has a very low 550 μA supply current,
and features the 5-Lead SC70 package.
80 MHz Gain Bandwidth Product
115 MHz –3dB Bandwidth
550 μA Supply Current (Typical)
5-Lead SC70 Package
3000V/μs Slew Rate (Typical)
Drives Any Capacitive Load
Unity Gain Stable
Applications
•
•
•
•
•
Video
Imaging
Ultrasound
Portable Equipment
Line Drivers
Supply voltage range is from ±2.5V to ±9V, allowing the
MIC920 to be used in low voltage circuits or
applications requiring large dynamic range.
The MIC920 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 MIC920 ideal for portable
equipment. The ability to drive capacitative loads also
makes it possible to drive long coaxial cables.
Package Type
Pin Configuration
IN– V– IN+
3
2
1
A37
4
5
OUT
V+
2019 Microchip Technology Inc.
Part
Identification
Functional Pinout
,1í 9í
3
2
IN+
1
4
5
OUT
V+
DS20006268A-page 1
MIC920
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VV+ to VV–) ....................................................................................................................................... 20V
Differential Input Voltage (VIN+ to VIN–) (Note 1) .......................................................................................................... 4V
Input Common Mode Range (VIN+ to VIN–) ...................................................................................................... VV+ to VV–
ESD Rating (Note 2)................................................................................................................................................1.5 kV
Operating Ratings ‡
Supply Voltage (VS)...................................................................................................................................... ±2.5V to ±9V
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside the operating ratings.
Note 1:
2:
Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in
particular, input bias current is likely to change).
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF. Pin 4 is ESD sensitive.
DS20006268A-page 2
2019 Microchip Technology Inc.
MIC920
ELECTRICAL CHARACTERISTICS (±5V)
Electrical Characteristics: V+ = +5V, V– = –5V, VCM = 0V, RL = 10 MΩ; TA = 25°C, unless otherwise noted.
Parameters
Symbol
Min.
Typ.
Max.
Units
Conditions
Input Offset Voltage
VOS
—
0.43
5
mV
–40°C ≤ TJ ≤ +85°C
Input Offset Voltage
ΔVOS/ΔTA
Temperature
Coefficient
—
1
—
μV/°C
–40°C ≤ TJ ≤ +85°C
Input Bias Current
IB
—
0.26
0.6
μA
–40°C ≤ TJ ≤ +85°C
Input Offset Current
IOS
—
0.04
0.3
μA
–40°C ≤ TJ ≤ +85°C
Input
Common-Mode
Range
VCM
–3.25
—
+3.25
V
CMRR > 72 dB, –40°C ≤ TJ ≤ +85°C
Common-Mode
Rejection Ratio
CMRR
75
85
—
dB
–2.5V < VCM < +2.5V
Power Supply
Rejection Ratio
PSRR
95
104
—
dB
±3.5V < VS < ±9V
Large-Signal
Voltage Gain
AVOL
65
82
—
dB
RL = 2k, VOUT = ±2V
—
85
—
dB
RL = 100Ω, VOUT = ±1V
+3.0
3.6
—
V
Positive, RL = 2 kΩ
–40°C ≤ TJ ≤ +85°C
—
–3.6
–3.0
V
Negative, RL = 2 kΩ
–40°C ≤ TJ ≤ +85°C
Maximum Output
Voltage Swing
VOUT
Unity
Gain-Bandwidth
Product
GBW
—
67
—
MHz
Phase Margin
PM
—
32
—
°
–3 dB Bandwidth
BW
—
100
—
MHz
AV = 1, CL = 1.7 pF, RL = 1 kΩ
Slew Rate
SR
—
1350
—
V/μs
C = 1.7 pF, Gain = 1, VOUT = 5V,
Peak to Peak, Positive SR = 1190V/μs
Short-Circuit Output
Current
ISC
45
63
—
20
45
—
Supply Current
IS
—
0.55
0.80
mA
Input Voltage Noise
—
—
11
—
nV/√Hz
f = 10 kHz
Input Current Noise
—
—
0.7
—
pA/√Hz
f = 10 kHz
2019 Microchip Technology Inc.
mA
CL = 1.7 pF
—
Source
Sink
No load, –40°C ≤ TJ ≤ +85°C
DS20006268A-page 3
MIC920
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: V+ = +9V, V– = –9V, VCM = 0V RL = 10 MΩ; TJ = 25°C, unless otherwise noted.
Parameters
Symbol
Min.
Typ.
Max.
Units
Conditions
Input Offset Voltage
VOS
—
0.3
5
mV
–40°C ≤ TJ ≤ +85°C
Input Offset Voltage
Temperature
Coefficient
ΔVOS/ΔTA
—
1
—
μV/°C
–40°C ≤ TJ ≤ +85°C
IB
—
0.23
0.60
μA
–40°C ≤ TJ ≤ +85°C
Input Offset Current
IOS
—
0.04
0.3
μA
–40°C ≤ TJ ≤ +85°C
Input
Common-Mode
Range
VCM
–7.25
—
+7.25
V
CMRR > 75 dB, –40°C ≤ TJ ≤ +85°C
Common-Mode
Rejection Ratio
CMRR
60
91
—
dB
–6.5V < VCM < +6.5V
Power Supply
Rejection Ratio
PSRR
95
104
—
dB
±3.5V < VS < ±9V
Large-Signal
Voltage Gain
AVOL
75
84
—
dB
RL = 2k, VOUT = ±2V
—
93
—
dB
RL = 100Ω, VOUT = ±1V
6.5
7.5
—
V
Positive, RL = 2 kΩ,
–40°C ≤ TJ ≤ +85°C
—
–7.5
–6.2
V
Negative, RL = 2 kΩ
–40°C ≤ TJ ≤ +85°C
80
—
MHz
Input Bias Current
Maximum Output
Voltage Swing
VOUT
Unity
Gain-Bandwidth
Product
GBW
—
Phase Margin
PM
—
30
—
°
–3 dB Bandwidth
BW
—
115
—
MHz
AV = 1, CL = 1.7 pF, RL = 1 kΩ
Slew Rate
SR
—
3000
—
V/μs
C = 1.7 pF, Gain = 1, VOUT = 5V, Peak
to Peak, Positive SR = 2500V/μs
Short-Circuit Output
Current
ISC
50
65
—
30
50
—
Supply Current
IS
—
0.55
0.8
mA
Input Voltage Noise
—
—
10
—
nV/√Hz
f = 10 kHz
Input Current Noise
—
—
0.8
—
pA/√Hz
f = 10 kHz
DS20006268A-page 4
mA
CL = 1.7 pF
—
Source
Sink
No load, –40°C ≤ TJ ≤ +85°C
2019 Microchip Technology Inc.
MIC920
TEMPERATURE SPECIFICATIONS (Note 1)
Parameters
Symbol
Min.
Typ.
Max.
Units
Conditions
Storage Temperature
TS
—
—
150
°C
Operating Junction Temperature Range
TJ
–40
—
+85
°C
—
Lead Temperature
—
—
—
260
°C
Soldering, 5 sec.
—
—
450
—
°C/W
Temperature Ranges
—
Package Thermal Resistance
Thermal Resistance SC70
Note 1:
—
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability.
2019 Microchip Technology Inc.
DS20006268A-page 5
MIC920
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
1.2
Vr = r2.5V
1.15
1.1
Vr = r5V
1.05
Vr = r9V
1
0.95
OFFSET VOLTAGE (mV)
OFFSET VOLTAGE (mV)
1.25
0.9
-40 -20 0 20 40 60 80 100
TEMPERATURE q(C)
FIGURE 2-1:
Temperature.
Offset Voltage vs.
2.2
2
Vr = r2.5V
1.8
1.6
–40qC
1.4
1.2
+25qC
1
0.8
0.6
0.4
0.2
+85qC
0
-900 -540 -180 180 540 900
COMMON-MODE VOLTAGE (V)
FIGURE 2-4:
Offset Voltage vs.
Common-Mode Voltage.
0.55
Vr = r5V
0.50
Vr = r2.5V
0.45
0.40
0.35
0.30
-40 -20 0 20 40 60 80 100
TEMPERATURE q(C)
+85qC
+25qC
–40qC
3.8 5.1 6.4 7.7
SUPPLY VOLTAGE (V)
FIGURE 2-3:
Voltage.
DS20006268A-page 6
9
Supply Current vs. Supply
–40qC
+25qC
+85qC
COMMON-MODE VOLTAGE (V)
FIGURE 2-5:
Offset Voltage vs.
Common-Mode Voltage.
OFFSET VOLTAGE (mV)
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
Supply Current vs.
Vr = r5V
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Vr = r9V
–40qC
+25qC
+85qC
-7.40
-5.92
-4.44
-2.96
-1.48
0
1.48
2.96
4.44
5.92
7.40
SUPPLY CURRENT (mA)
FIGURE 2-2:
Temperature.
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
-2.04
-1.36
-0.68
0
0.68
1.36
2.04
2.72
3.40
SUPPLY CURRENT (mA)
Vr = r9V
OFFSET VOLTAGE (mV)
0.60
COMMON-MODE VOLTAGE (V)
FIGURE 2-6:
Offset Voltage vs.
Common-Mode Voltage.
2019 Microchip Technology Inc.
5.5
5.0
4.5
4.0 85qC
3.5
3.0
2.5 –40qC
2.0
1.5
1.0
0.5
0
FIGURE 2-10:
Current (Sinking).
25qC
11
10
9
8
7
6
5
4
3
2
1
0
Vr = r9V
25qC
–40qC
85qC
FIGURE 2-11:
Output Voltage vs. Output
Current (Sourcing).
1
25qC
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
OUTPUT CURRENT (mA)
FIGURE 2-9:
Output Voltage vs. Output
Current (Sourcing).
2019 Microchip Technology Inc.
Output Voltage vs. Output
OUTPUT CURRENT (mA)
Vr = r5V
0
-8
-16
-24
-32
-40
-48
-56
-64
-72
-80
OUTPUT VOLTAGE (V)
FIGURE 2-8:
Short Circuit Current vs.
Supply Voltage (Sinking).
OUTPUT CURRENT (mA)
Vr = r9V
85qC
–40qC
50
45
40
35
30
25
20
15
10
5
0
SHORT-CIRCUIT CURRENT (mA)
17
20
23
26
29
32
35
38 25qC
85qC
41
44
47
–40qC
50
2.0 3.4 4.8 6.2 7.6 9.0
SUPPLY VOLTAGE (V)
–40qC
45.0
40.5
36.0
31.5
27.0
22.5
18.0
13.5
9.0
4.5
0
3.4 4.8 6.2 7.6 9.0
SUPPLY VOLTAGE (V)
FIGURE 2-7:
Short Circuit Current vs.
Supply Voltage (Sourcing).
Vr = r5V
0
-8
-16
-24
-32
-40
-48
-56
-64
-72
-80
85qC
OUTPUT VOLTAGE (V)
–40qC
25qC
0.5
85qC
0
-0.5
-1.0
-1.5
-2.0 25qC
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
OUTOUT VOLTAGE (V)
84
80
76
72
68
64
60
56
52
48
44
40
2.0
OUTOUT VOLTAGE (V)
SHORT-CIRCUIT CURRENT (mA)
MIC920
OUTPUT CURRENT (mA)
FIGURE 2-12:
Current (Sinking).
Output Voltage vs. Output
DS20006268A-page 7
MIC920
BIAS CURRENT (PA)
0.30
0.25
r5V
0.20
0.15
r9V
0.10
0.05
CLOSED-LOOP GAIN (dB)
0.35
0.00
-40 -20 0 20 40 60 80 100
TEMPERATURE q(C)
Closed-Loop Frequency
25
20
15
10
5
r9.0V
0
r5.0V
-5
r2.5V
-10
-15 Av = 2
R = RI = 475:
-20 F
-25
1E+6
10E+6
100E+6
200E+6
1M
100M
10M
FREQUENCY (Hz)
FIGURE 2-15:
Response.
DS20006268A-page 8
Closed-Loop Frequency
FIGURE 2-16:
Frequency.
CLOSED-LOOP GAIN (dB)
25
20
15
10
5
r9.0V
0
-5
r5.0V
-10
r2.5V
-15
Av = –1
-20 R+ = R = 475:
I
-25
1E+6
10E+6
100E+6
200E+6
1M
100M
10M
FREQUENCY (Hz)
FIGURE 2-14:
Response.
GAIN (dB)
Bias Current vs.
Closed-Loop Gain vs.
50
40
30
20
1.7pF
10
200pF
0
100pF
-10
1000pF
800pF
-20
600pF
400pF
-30
Vr = r9V
-40 Av = 1
-50
1E+6
1E+7
1E+8
2E+8
1M
10M
100M
FREQUENCY (Hz)
FIGURE 2-17:
Response.
OPEN-LOOP GAIN (dB)
GAIN (dB)
FIGURE 2-13:
Temperature.
50
40
30
20
10
400pF 200pF
0
0
100pF
-10
1000pF
800pF
-20
600pF
-30
Vr
=
r5V
-40
Av = 1
-50
1E+6
10E+6
100E+6
200E+6
100M
1M
10M
FREQUENCY (Hz)
Closed-Loop Frequency
50
Vr = r5V
40
30
20
121pF
50pF
10
1.7pF
0 1000pF
471pF
-10
200pF
-20
-30
-40
-50
6
6
10M6
100M
1M 6
1x10
10x10
100x10
200x10
FREQUENCY (Hz)
FIGURE 2-18:
Frequency.
Open-Loop Gain vs.
2019 Microchip Technology Inc.
33
70
31
65
29
60
27
55
Gain Bandwidth
50
25
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE (rV)
FIGURE 2-20:
Gain Bandwidth and Phase
Margin vs. Supply Voltage.
40
Phase Margin
35
30
20
Gain
Bandwidth
10
0
0
25
20
200 400 600 800 1000
CAPACITIVE LOAD (pF)
FIGURE 2-21:
Margin vs. Load.
Gain Bandwidth and Phase
2019 Microchip Technology Inc.
PHASE MARGIN (q)
35
30
30
Gain
Bandwidth
20
10
25
20
200 400 600 800 1000
CAPACITIVE LOAD (pF)
Gain Bandwidth and Phase
100
Vr = r5V
100:
60
-20
180
135
No Load
20
0
225
Phase 90
40
Gain
45
0
100:
-45
-40
-90
-60
-135
-80
-180
-100
100k
FIGURE 2-23:
Response.
45
50
40
40
-225
1M
10M
100M
CAPACITIVE LOAD (pF)
Open-Loop Frequency
50
PHASE MARGIN (q)
GAIN BANDWIDTH (MHz)
Vr = r5V
60
30
50
100
80
60
40
20
0
-20
-40
-60
-80
-100
100k
FIGURE 2-24:
Response.
225
180
100:
135
Phase 90
No Load
45
0
Gain
100:
-45
-90
-135
-180
-225
1M
10M
100M
CAPACITIVE LOAD (pF)
Vr = r9V
PHASE MARGIN (q)
75
40
Phase Margin
PHASE M ARG IN (q)
35
70
45
60
80
80
55
50
70
FIGURE 2-22:
Margin vs. Load.
37
Phase Margin
PHASE MARGIN (q)
GAIN BANDWIDTH (MHz)
85
Open-Loop Gain vs.
Vr = r9V
80
0
0
G A IN B A N D W ID T H (d B )
FIGURE 2-19:
Frequency.
90
GAIN BANDWIDTH (MHz)
50
Vr = r9V
40
30
20
121pF
50pF
10
1.7pF
0 1000pF
471pF
-10
200pF
-20
-30
-40
-50
6
6
10M6
100M
1M 6
1x10
10x10
100x10
200x10
FREQUENCY (Hz)
GAIN BANDWIDTH (dB)
OPEN-LOOP GAIN (dB)
MIC920
Open-Loop Frequency
DS20006268A-page 9
MIC920
120
120
V± = ±9V
100
100
80
80
PSRR (dB)
PSRR (dB)
V± = ±5V
60
40
60
40
20
0
0.1
20
1
FIGURE 2-25:
Frequency.
10 100 1k
FREQUENCY (kHz)
0
0.1
10k
Positive PSRR vs.
FIGURE 2-28:
Frequency
120
V± = ±5V
80
CMRR (dB)
PSRR (dB)
100
60
40
20
0
0.1
1
FIGURE 2-26:
Frequency.
10 100 1k
FREQUENCY (kHz)
10k
Negative PSRR vs.
100
90
80
70
60
50
40
30
20
10
0
100x10
100 0
FIGURE 2-29:
Ratio.
1
10 100 1k
FREQUENCY (kHz)
10k
Negative PSRR vs.
V± = ±5V
1x10
1k3
10x10
10k3 100x10
100k3 1x10
1M6 10x10
10M6
FREQUENCY (Hz)
Common-Mode Rejection
120
V± = ±9V
80
CMRR (dB)
PSRR (dB)
100
60
40
20
0
0.1
1
FIGURE 2-27:
Frequency
DS20006268A-page 10
10 100 1k
FREQUENCY (kHz)
10k
Positive PSRR vs.
100
90
80
70
60
50
40
30
20
10
0
100x10
100 0
FIGURE 2-30:
Ratio.
V± = ±9V
1x10
1k3
10x10
10k3 100x10
100k3 1x10
1M6 10x10
10M6
FREQUENCY (Hz)
Common-Mode Rejection
2019 Microchip Technology Inc.
MIC920
1400
3000
V± = ±5V
1000
800
600
400
2000
1500
1000
500
200
Positive Slew Rate.
1200
V± = ±5V
SLEW RATE (V/μs)
1000
800
600
400
200
0
0
FIGURE 2-32:
Negative Slew Rate.
SLEW RATE (V/μs)
Negative Slew Rate.
60
50
40
30
20
10
0
10
FIGURE 2-35:
Frequency.
100
1000 10000 100000
FREQUENCY (Hz)
Voltage Noise Density vs.
2.5
V± = ±9V
3000
2500
2000
1500
1000
500
FIGURE 2-33:
200 400 600 800 1000
LOAD CAPACITANCE (pF)
70
200 400 600 800 1000
LOAD CAPACITANCE (pF)
3500
0
0
FIGURE 2-34:
NOISE VOLTAGE (nV/Hz1/2)
FIGURE 2-31:
0
0
200 400 600 800 1000
LOAD CAPACITANCE (pF)
200 400 600 800 1000
LOAD CAPACITANCE (pF)
Positive Slew Rate.
2019 Microchip Technology Inc.
NOISE CURRENT (pA/Hz1/2)
0
0
V± = ±9V
2500
SLEW RATE (V/μs)
SLEW RATE (V/μs)
1200
2.0
1.5
1.0
0.5
0
10
FIGURE 2-36:
Frequency.
100
1000 10000 100000
FREQUENCY (Hz)
Current Noise Density vs.
DS20006268A-page 11
TIME (100ns/div)
VCC = ±5.0V
CL = 1.7μF
Av = 1.0V/V
TIME (100ns/div)
FIGURE 2-40:
Response.
TIME (100ns/div)
VCC = ±9.0V
CL = 100pF
Av = +1
FIGURE 2-41:
Response.
DS20006268A-page 12
Small Signal Pulse
VCC = ±5.0V
CL = 1000pF
Av = +1V/V
OUTPUT
(50mV/div)
TIME (100ns/div)
FIGURE 2-39:
Response.
VCC = ±9.0V
CL = 1000pF
Av = +1V/V
TIME (100ns/div)
INPUT
(50mV/div)
Small Signal Pulse
OUTPUT
(50mV/div)
INPUT
(50mV/div)
FIGURE 2-38:
Response.
Small Signal Pulse
OUTPUT
(50mV/div)
INPUT
(50mV/div)
Small Signal Pulse
OUTPUT
(50mV/div)
INPUT
(50mV/div)
FIGURE 2-37:
Response.
VCC = ±5.0V
CL = 100pF
Av = +1V/V
OUTPUT
(50mV/div)
INPUT
(50mV/div)
VCC = ±9.0V
CL = 1.7μF
Av = 1.0V/V
OUTPUT
(50mV/div)
INPUT
(50mV/div)
MIC920
Small Signal Pulse
TIME (100ns/div)
FIGURE 2-42:
Response.
Small Signal Pulse
2019 Microchip Technology Inc.
MIC920
OUTPUT
(2V/div)
OUTPUT
(2V/div)
V = ±5V
CL = 1.7pF
Av = 1
Positive SR = 1350V/μsec
Negative SR = 1190V/sec
V = ±9V
CL = 100pF
Av = 1
Positive SR = 672V/μsec
Negative SR = 424V/sec
TIME (10ns/div)
FIGURE 2-43:
Large Signal Response.
TIME (50ns/div)
FIGURE 2-46:
Large Signal Response.
Output
(2V/div)
OUTPUT
(2V/div)
V = ±5V
CL = 1000pF
Av = 1
Positive SR = 75V/μsec
Negative SR = 41V/sec
V = ±9V
CL = 1.7pF
Av = 1
Positive SR = 3000V/μsec
Negative SR = 2500V/μsec
TIME (10ns/div)
FIGURE 2-44:
Large Signal Response.
TIME (100ns/div)
FIGURE 2-47:
Large Signal Response.
OUTPUT
(2V/div)
OUTPUT
(2V/div)
V = ±5V
CL = 100pF
Av = 1
Positive SR = 373V/μsec
Negative SR = 290V/sec
V = ±9V
CL = 1000pF
Av = 1
Positive SR = 97V/μsec
Negative SR = 60V/sec
TIME (50ns/div)
FIGURE 2-45:
Large Signal Response.
2019 Microchip Technology Inc.
TIME (100ns/div)
FIGURE 2-48:
Large Signal Response.
DS20006268A-page 13
MIC920
3.0
TEST CIRCUITS
V+
10μF
V+
R2
5k
10μF
0.1μF
BNC
Input
BNC
0.1μF
10k
10k
10k
R1 5k
Input
3
4
BNC
Output
5
0.1μF
MIC920
4
BNC
Output
1
5E
5D
5
MIC920
3
R7c 2k
2k
2
0.1μF
R6
1
2
5k
R3
200k
0.1μF
BNC
10μF
V–
All resistors 1%
R4
Input
50
R5
5k
0.1μF
§ R2 R2 + R 5 + R4 ·
VOUT = VERROR ¨1 +
+
¸
© R1
¹
R7
All resistors:
1% metal film
10μF
V–
FIGURE 3-1:
PSRR vs. Frequency.
100pF
FIGURE 3-3:
V+
CMRR vs. Frequency.
V+
10μF
10pF
R1
10μF
3
R3 27k
S1
S2
R5
R2 4k
3
5
MIC920
0.1μF
MIC920
4
BNC
1
2
R4 27k
0.1μF
5
0.1F
To
Dynamic
Analyzer
VIN
4
1
2
0.1μF
1k
VOUT
FET Probe
CL
10μF
10pF
10μF
V–
V–
FIGURE 3-2:
DS20006268A-page 14
Noise Measurement.
FIGURE 3-4:
Closed Loop Frequency
Response Measurement.
2019 Microchip Technology Inc.
MIC920
4.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 4-1.
TABLE 4-1:
PIN FUNCTION TABLE
Pin Number
Symbol
Description
1
IN+
Non-inverting input.
2
V–
Negative Supply (Input).
3
IN–
Inverting Input.
4
OUT
Output: Amplifier Output
5
V+
Positive Supply (Input).
2019 Microchip Technology Inc.
DS20006268A-page 15
MIC920
5.0
APPLICATION INFORMATION
The MIC920 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.
5.1
Driving High Capacitance
The MIC920 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:
5.2
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
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