AS321
LOW POWER SINGLE OPERATIONAL AMPLIFIER
Description
The AS321 is a high gain and internally frequency compensated
operational amplifier specifically designed to operate from a single
power supply. Operation from split power supply is also possible and
the low power supply current drain is independent of the magnitude of
the power supply voltages. Typical applications include battery
charger, active filters, general purpose controllers and most
conventional operational amplifier circuits.
The AS321 is compatible with industry standard 321.
Pin Assignments
(Top View)
INPUT +
1
2
3
5
V
CC
V
EE
INPUT -
The AS321 is available in SOT25 package.
4
OUTPUT
Features
Excellent Phase Margin: 60 deg.
Large Voltage Gain: 100dB (Typical)
Low Input Bias Current: 20nA (Typical)
Low Input Offset Voltage: 2mV (Typical)
Low Supply Current: 0.35mA at V
CC
= 5V
Wide Power Supply Voltage:
Single Supply: 3V to 36V
Dual Supplies: ±1.5V to ±18V
Wide Input Common Mode Voltage Range: 0V to V
CC
-1.5V
Lead-Free Packages: SOT25
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Lead-Free Packages, Available in “Green” Molding Compound:
SOT25
Notes:
SOT25
Applications
Battery Charger
Active Filters
General Purpose Controllers, Instruments
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
Power Amplifier
DC Summing Amplifier
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AS321
Document number: DS36976 Rev. 3 - 2
AS321
Typical Applications Circuit
(Cont.)
AC Coupled Non-Inverting Amplifier
Fixed Current Sources
Pulse Generator
DC Coupled Low-Pass Active Filter
AS321
Document number: DS36976 Rev. 3 - 2
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AS321
Functional Block Diagram
Absolute Maximum Ratings
(Note 4)
Symbol
V
S
(V
CC
-V
EE
)
V
ID
V
IN
θ
JA
T
J
T
STG
T
LEAD
Parameter
Power Supply Voltage
Differential Input Voltage
Input Voltage
Thermal Resistance to Ambient
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 Seconds)
Rating
40
40
-0.3 to 40
260
+150
-65 to +150
+260
Unit
V
V
V
°
C/W
°
C
°
C
°
C
Note 4: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
CC
T
A
Supply Voltage
Ambient Operating Temperature Range
Parameter
Min
3
-40
Max
36
+85
Unit
V
°
C
AS321
Document number: DS36976 Rev. 3 - 2
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AS321
Electrical Characteristics
(Limits in standard typeface are for T
A
= +25°
bold
typeface applies over -40° to +85° (Note 5), V
CC
C,
C
C
= 5V, V
EE
= 0V, V
O
= 1.4V, unless otherwise specified.)
Symbol
V
IO
∆V
IO
/∆T
I
BIAS
Parameter
Input Offset Voltage
Average Temperature Coefficient
of Input Offset Voltage
Input Bias Current
Conditions
V
O
= 1.4V, R
S
= 0Ω, V
CC
= 5V to 30V
(Note 6)
T
A
= -40° to +85°
C
C
I
IN
+ or I
IN
-, V
CM
= 0V
Min
—
—
—
—
—
—
—
0
—
—
—
—
85
80
60
60
70
60
20
20
10
5
12
—
26
26
27
27
—
—
—
—
—
Typ
2
—
7
20
—
5
—
—
0.35
0.45
0.45
0.65
100
—
70
—
100
—
40
—
15
—
50
40
—
—
28
—
5
—
0.015
60
101
Max
5
7
—
100
200
30
100
V
CC
-1.5
0.80
1.0
Unit
mV
µV/°
C
nA
I
IO
V
CM
Input Offset Current
Input Common Mode Voltage
Range (Note 7)
I
IN
+ - I
IN
-, V
CM
= 0V
V
CC
= 30V, CMRR ≥ 50dB
R
L
= ∞, V
CC
= 5V
nA
V
I
CC
Supply Current
R
L
= ∞, V
CC
= 30V
mA
1.2
1.5
—
—
—
—
—
—
—
—
—
—
—
60
—
—
—
—
20
30
—
—
—
mV
%
Deg
°
C/W
V
mA
µA
mA
dB
G
V
Large Signal Voltage Gain
V
CC
= 15V, V
O
= 1V to 11V, R
L
≥ 2kΩ
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to (V
CC
-1.5)V, R
S
≤ 10kΩ
dB
PSRR
Power Supply Rejection Ratio
V
CC
= 5V to 30V, R
S
≤ 10kΩ
V
IN
+ = 1V, V
IN
- = 0V, V
CC
= 15V, V
O
=
2V
V
IN
+ = 0V, V
IN
- = 1V, V
CC
= 15V, V
O
=
dB
I
SOURCE
Output Current
I
SINK
Source
mA
Sink
2V
V
IN
+ = 0V, V
IN
- = 1V, V
CC
= 15V, V
O
=
0.2V
I
SC
Output Short Circuit Current to
Ground
V
CC
= 15V
V
CC
= 30V, R
L
= 2kΩ
V
OH
Output Voltage Swing
V
CC
= 30V, R
L
= 10kΩ
V
OL
THD
Φ
M
θ
JC
Notes:
V
CC
= 5V, R
L
= 10kΩ
Total Harmonic Distortion
Phase Margin
Thermal Resistance
(Junction to Case)
f = 1kHz, AV = 20dB, R
L
= 2kΩ,
V
O
= 2Vp-p, C
L
= 100pF, V
CC
= 30V
—
SOT25
5. Limits over the full temperature are guaranteed by design, but not tested in production.
6. Over the full input common-mode range 0V to V
CC
-1.5V (at +25°
C).
7. The input common-mode voltage of either input signal voltage should not be allowed to go negatively by more than 0.3V (at +25° The upper end of the
C).
common-mode voltage range is V
CC
-1.5V (at +25° but either or both inputs can go to +36V without damages, independent of the magnitude of the V
CC
.
C),
AS321
Document number: DS36976 Rev. 3 - 2
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AS321
Performance Characteristics
Input Voltage Range
15
20
18
16
Input Current
Input Voltage (+V
DC
)
10
Input Current (nA)
14
12
10
8
6
4
2
NEGATIVE
POSITIVE
5
0
0
5
10
15
0
-25
0
25
50
o
75
100
125
Power Supply Voltage (+V
DC
)
Temperature ( C)
Supply Current
1.0
0.9
0.8
Voltage Gain
120
105
Supply Current (mA)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
5
10
15
20
25
30
35
40
Voltage Gain (dB)
0.7
90
R
L
=2K
R
L
=20K
75
60
0
8
16
24
32
40
Supply Voltage (V)
Power Supply Voltage (V)
Open Loop Gain vs. Frequency
80
V
CC
=30V, V
EE
=0V
R
L
=2k
, C
L
=100pF
Voltage Follower Pulse Response
4
3
2
1
0 3
2
1
0
60
Open Loop Gain (dB)
40
20
0
-20
0.2k
1k
10k
100k
1M 2M
Input Voltage (V)
Output Voltage (V)
0
4
8
12
16
20
24
28
32
36
40
Frequency (Hz)
Time (µs)
AS321
Document number: DS36976 Rev. 3 - 2
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