MINGDA
MICROELECTRONICS
FEATURES
Low Cost
Rail-to-Rail Input and Output
0.8mV Typical V
OS
Unity Gain Stable
Gain-Bandwidth Product: 1MHz
Very Low Input Bias Current: 10pA
Supply Voltage Range: 2.1V to 5.5V
Input Voltage Range:
-0.1V to +5.6V with (V
DD
- V
SS
) = 5.5V
Low Supply Current: 40μA/Amplifier
Small Packaging
MD1321 Available in SOT-23-5
MD1322 Available in SOIC-8
MD1321/2
1MHz, 40μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
PRODUCT DESCRIPTION
The MD1321 (single), MD1322 (dual) are low cost,
rail-to-rail input and output voltage feedback amplifiers.
They have a wide input common mode voltage range
and output voltage swing, and take the minimum
operating supply voltage down to 2.1V. The maximum
recommended supply voltage is 5.5V. It is specified over
the extended -40℃ to +85℃ temperature range.
The MD1321/2 provide 1MHz bandwidth at a low
current consumption of 40μA per amplifier. Very low
input bias currents of 10pA enable MD1321/2 to be used
for integrators, photodiode amplifiers, and piezoelectric
sensors. Rail-to-rail input and output are useful to
designers for buffering ASIC in single-supply systems.
Applications for this series of amplifiers include safety
monitoring, portable equipment, battery and power
supply control, and signal conditioning and interfacing
for transducers in very low power systems.
The MD1321 is available in the Green SOT-23-5
Package. The MD1322 comes in the Green SOIC-8
package.
APPLICATIONS
ASIC Input or Output Amplifier
Sensor Interface
Piezoelectric Transducer Amplifier
Medical Instrumentation
Mobile Communication
Audio Output
Portable Systems
Smoke Detectors
Notebook PC
PCMCIA Cards
Battery-Powered Equipment
DSP Interface
PIN CONFIGURATIONS
(TOP VIEW)
MD1321
V
IN+
V
SS
V
IN-
1
2
3
SOT-23-5
4 V
OUT
5 V
DD
V
OUTA
1
V
INA-
V
INA+
V
SS
2
3
4
SOIC-8
MD1322
8 V
DD
7 V
OUTB
6 V
INB-
5 V
INB+
REV. A. 1.0
MD Micro Corp
www.md-ic.com.cn
1
MD1321/2
ORDER INFORMATION
PACKAGE
MODEL
MD1321
MD1322
ORDER NUMBER
DESCRIPTION
--
--
SOT23-5
SOIC-8
1MHz, 40μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
MARKING
PACKAGE OPTION
INFORMATION
Tape and Reel, 2500
Tape and Reel, 2500
--
--
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
DD
to V
SS
...............................................................6V
Common Mode Input Voltage…...................V
SS
- 0.3V to V
DD
+ 0.3V
Storage Temperature Range.......................................-65℃ to +150℃
Junction Temperature...................................................................150℃
Operating Temperature Range......................................-40℃ to +85℃
Package Thermal Resistance @ T
A
= +25℃
SOIC-8, θJA....................................................................125℃/W
Lead Temperature (Soldering 10sec)................................260℃
NOTE:
Stresses beyond 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 in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
ESD, Electrostatic Discharge Protection
Symbol
HBM
MM
Parameter
Human Body Model ESD
Machine Model ESD
Condition
Minimum Level
4
300
Unit
kV
V
2
MD Micro Corp
www.md-ic.com.cn
1MHz, 40μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
ELECTRICAL CHARACTERISTICS
MD1321/2
The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are At T
A
=25℃, V
DD
= +5V, V
SS
= GND,
R
L
= 100kΩ connected to V
DD
/2, and V
OUT
= V
DD
/2.
PARAMETER
INPUT CHARACTERISTICS
SYMBOL
CONDITIONS
V
CM
= V
DD
/2
MIN
TYP
0.8
MAX UNITS
5
6.6
mV
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Offset Voltage Drift
Input Common Mode Voltage Range
Common Mode Rejection Ratio
Open-Loop Voltage Gain
V
OS
V
CM
= V
DD
/2
I
B
I
OS
ΔV
OS
/Δ
T
V
CM
CMRR
A
OL
V
DD
= 5.5V
V
DD
= 5.5V, V
CM
= -0.1V to 4V
R
L
= 100kΩ, V
OUT
= 2.5V
R
L
= 100kΩ, V
OUT
= +0.2V to +4.8V
●
10
10
2
-0.1-5.6
76
95
93
pA
pA
μV/℃
V
dB
dB
dB
OUTPUT CHARACTERISTICS
V
OH
V
OL
Output Voltage Swing from Rail
V
OH
V
OL
I
SOURCE
Output Current
I
SINK
R
L
= 100kΩ
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 10kΩ
R
L
= 10Ω to V
DD
/2
4.980
25
4.970
35
4.995
5
4.994
6
40
mA
40
V
mV
V
mV
POWER SUPPLY
2.1
Operating Voltage Range
Power Supply Rejection Ratio
Quiescent Current/Amplifier
PSRR
I
Q
V
DD
= +2.5V to +5.5V, V
CM
= +0.5V
●
2.5
85
40
●
35
80
5.5
V
V
dB
μA
DYNAMIC PERFORMANCE (C
L
= 100pF)
Gain-Bandwidth Product
Phase Margin
Harmonic Distortion
HD3
Slew Rate
Settling Time to 0.1%
Overload Recovery Time
SR
f = 10kHz, G = +1, R
L
=100k,V
OUT
=2V
PP
G = +1, 2V Output Step
G = +1, 2V Output Step
V
IN
·G = V
DD
>80
0.64
6
2.5
V/μs
μs
μs
nV/√Hz
nV/√Hz
GBP
PM
HD2
R
L
= 100kΩ, C
L
= 100pF
f = 10kHz, G = +1, R
L
=100k,V
OUT
=2V
PP
1
45
>80
dBc
MHz
°
t
s
NOISE PERFORMANCE
Voltage Noise Density
e
n
f = 1kHz
f = 10kHz
30
20
MD Micro Corp
www.md-ic.com.cn
3
MD1321/2
TYPICAL PERFORMANCE CHARACTERISTICS
1MHz, 40μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
At T
A
= +25℃, V
DD
= +5V, V
SS
= GND, and R
L
= 100kΩ connected to V
DD
/2, unless otherwise specified.
45
40
35
Supply Current (μA)
30
25
20
15
10
5
0
0
1
2
3
Supply Voltage (V)
4
5
V
CM
=V
DD
/2
Supply Current (μA)
80
75
70
65
60
55
50
45
40
35
30
-50
-25
0
25
50
75
Temperature (℃)
100
125
150
Figure 1. Supply Current vs. Supply Voltage
60
Output Short Circuit Current (mA)
50
40
30
20
10
0
0
1
2
3
Supply Voltage (V)
4
5
Sink
Open-Loop Gain (dB)
120
110
100
90
80
70
60
Figure 2. Supply Current vs. Temperature
Source
-50
-25
0
25
50
75
Temperature (℃)
100
125
150
Figure 3.
Output Short Circuit Current vs. Supply Voltage
120
110
CMRR (dB)
100
90
80
70
60
-50
-25
0
25
50
75
Temperature (℃)
100
125
150
V
DD
=5.5V
0V≤V
CM
≤4V
PSRR (dB)
Figure 4. Open-Loop Gain vs. Temperature
120
110
100
90
80
70
60
-50
-25
0
25
50
75
Temperature (℃)
100
125
150
Figure 5. CMRR vs. Temperature
Figure 6. PSRR vs. Temperature
4
MD Micro Corp
www.md-ic.com.cn
1MHz, 40μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
TYPICAL PERFORMANCE CHARACTERISTICS
At T
A
= +25℃, V
DD
= +5V, V
SS
= GND, and R
L
= 100kΩ connected to V
DD
/2, unless otherwise specified.
50%
45%
Small-Signal Overshoot
40%
35%
30%
25%
20%
15%
10%
5%
0%
1
10
100
C
L
(pF)
1000
10000
+OS
-OS
G=+1
Small-Signal Overshoot
80%
70%
60%
50%
40%
30%
20%
10%
0%
1
10
100
C
L
(pF)
G=-1
R
FB
=20kΩ
-OS
MD1321/2
+OS
1000
10000
Figure 7. Small-Signal Overshoot vs. Load Capacitance
5
4.5
Output Voltage (V)
4
3.5
3
2.5
2
1.5
1
0.5
0
0
10
20
30
Output Current (mA)
40
50
Sink
V
DD
=+5V
Output Voltage (V)
Source
Figure 8. Small-Signal Overshoot vs. Load Capacitance
2.5
Source
2
1.5
V
DD
=+2.5V
1
0.5
0
0
5
10
15
Output Current (mA)
20
Sink
Figure 9. Output Voltage vs. Output Current
1000
Maximum Outputt Voltage (V
PP
)
Voltage Noise
（nV/√Hz）
Figure 10. Output Voltage vs. Output Current
6
5
V
DD
=+5V
4
3
2
1
0
V
DD
=+2.5V
V
DD
=+5.5V
100
10
1
0.01
0.1
1
10
Frequency (kHz)
100
1
10
100
1000
Frequency (kHz)
10000
Figure 11. Input Voltage Noise Spectral Density vs. Frequency
Figure 12. Maximum Output Voltage vs. Frequency
MD Micro Corp
www.md-ic.com.cn
5
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