SGM8531/2/4
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
PRODUCT DESCRIPTION
FEATURES
The SGM8531 (single), SGM8532 (dual) and SGM8534
(quad) 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. All are
specified over the extended -40℃ to +125℃ temperature
range.
Low Cost
Rail-to-Rail Input and Output
0.8mV Typical VOS
Unity Gain Stable
Gain-Bandwidth Product: 500kHz
Very Low Input Bias Current: 0.5pA
Supply Voltage Range: 2.1V to 5.5V
Input Voltage Range:
-0.1V to +5.6V with VS = 5.5V
Low Supply Current: 18μA/Amplifier
Small Packaging
SGM8531 Available in SOIC-8 and SOT-23-5
SGM8532 Available in SOIC-8 and MSOP-8
SGM8534 Available in SOIC-14 and TSSOP-14
The SGM8531/2/4 provide 500kHz bandwidth at a low
current consumption of 18μA per amplifier. Very low input
bias currents of 0.5pA enable the SGM8531/2/4 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 these amplifiers include safety monitoring,
portable equipment, battery and power supply control,
and signal conditioning and interfacing for transducers in
very low power systems.
The SGM8531 single is available in the Green SOT-23-5
and SOIC-8 packages. The SGM8532 dual comes in
Green SOIC-8 and MSOP-8 packages. The SGM8534
quad is offered in Green SOIC-14 and TSSOP-14
packages.
PIN CONFIGURATIONS (TOP VIEW)
SGM8531
NC
1
-IN
2
7 +VS
+IN
3
6
OUT
-VS
4
5
NC
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OUT
5 +VS
1
-VS 2
+IN 3
APPLICATIONS
ASIC Input or Output Amplifier
Sensor Interface
Piezoelectric Transducer Amplifier
Medical Instrumentation
Mobile Communication
Audio Output
Portable Systems
Smoke Detectors
Mobile Telephone
Notebook PC
PCMCIA Cards
Battery-Powered Equipment
SGM8531
NC
8
NC = NO CONNECT
SOT-23-5
SOIC-8
SGM8534
OUTA 1
SGM8532
OUTA 1
4 -IN
8 +VS
-INA 2
7 OUTB
+INA 3
6 -INB
-VS 4
5 +INB
14 OUTD
-INA 2
13 -IND
+INA 3
12 +IND
+VS 4
SOIC-8/MSOP-8
11 -VS
+INB 5
10 +INC
-INB 6
9 -INC
8 OUTC
OUTB 7
SOIC-14/TSSOP-14
REV. C. 4
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
PACKAGE/ORDERING INFORMATION
MODEL
SGM8531
SGM8532
SGM8534
ORDER NUMBER
PACKAGE
DESCRIPTION
PACKAGE
OPTION
MARKING
INFORMATION
SGM8531XN5/TR
SOT-23-5
Tape and Reel, 3000
8531
SGM8531XS/TR
SOIC-8
Tape and Reel, 2500
SGM8531XS
SGM8532XS/TR
SOIC-8
Tape and Reel, 2500
SGM8532XS
SGM8532XMS/TR
MSOP-8
Tape and Reel, 3000
SGM8532XMS
SGM8534XS14/TR
SOIC-14
Tape and Reel, 2500
SGM8534XS14
SGM8534XTS14/TR
TSSOP-14
Tape and Reel, 3000
SGM8534XTS14
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, +VS to -VS .....................................................6V
Common Mode Input Voltage.......... (-VS) - 0.3V to (+VS) + 0.3V
Storage Temperature Range............................. -65℃ to +150℃
Junction Temperature ........................................................150℃
Operating Temperature Range ......................... -40℃ to +125℃
Package Thermal Resistance @ TA = +25℃
SOIC-8, θJA....................................................................125℃/W
MSOP-8, θJA................................................................. 216℃/W
Lead Temperature (Soldering 10sec)…………….…..........260℃
ESD Susceptibility
HBM………………............................................................4000V
MM………………….............................................................400V
SOT-23-5, θJA................................................................ 190℃/W
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.
CAUTION
This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause
damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
SGMICRO reserves the right to make any change in circuit design, specification or other related things if necessary without notice at
any time. Please contact SGMICRO sales office to get the latest datasheet.
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2
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
ELECTRICAL CHARACTERISTICS
(At VS = +5V, RL = 200kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted.)
SGM8531/2/4
PARAMETER
SYMBOL
CONDITIONS
TYP
MIN/MAX OVER TEMPERATURE
+25℃
+25℃
-40℃ to +125℃
UNITS
MIN/MAX
0.8
3.5
5.4
mV
MAX
INPUT CHARACTERISTICS
Input Offset Voltage
VOS
VCM = VS/2
Input Bias Current
IB
0.5
pA
TYP
Input Offset Current
IOS
0.5
pA
TYP
Input Common Mode Voltage
Range
VCM
-0.1 to +5.6
V
TYP
Common Mode Rejection Ratio
CMRR
dB
MIN
dB
MIN
μV/℃
TYP
4.970
V
MIN
Open-Loop Voltage Gain
Input Offset Voltage Drift
AOL
VS = 5.5V
VS = 5.5V, VCM = -0.1V to +4V
88
71
68
VS = 5.5V, VCM = -0.1V to +5.6V
75
60
57
RL = 5kΩ, VO = +0.1V to +4.9V
104
86
81
RL = 100kΩ, VO = +0.035V to +4.965V
110
90
86
ΔVOS/ΔT
1.7
OUTPUT CHARACTERISTICS
VOH
Output Voltage Swing
Output Current
RL = 100kΩ
4.997
4.980
VOL
RL = 100kΩ
3
20
30
mV
MAX
VOH
RL = 10kΩ
4.994
4.970
4.960
V
MIN
VOL
RL = 10kΩ
6
30
40
mV
MAX
85
60
45
mA
MIN
76
60
45
2.1
2.5
V
MIN
5.5
5.5
V
MAX
85
70
66
dB
MIN
18
33
39
μA
MAX
500
kHz
TYP
ISOURCE
ISINK
RL = 10Ω to VS/2
POWER SUPPLY
Operating Voltage Range
Power Supply Rejection Ratio
PSRR
Quiescent Current/Amplifier
VS = +2.5V to +5.5V, VCM = +0.5V
IQ
DYNAMIC PERFORMANCE (CL = 100pF)
Gain-Bandwidth Product
Slew Rate
GBP
SR
G = +1, 2V Output Step
0.2
V/μs
TYP
tS
G = +1, 2V Output Step
18
μs
TYP
VIN ·Gain = VS
16
μs
TYP
f = 1kHz
33
nV/
Hz
TYP
f = 10kHz
20
nV/
Hz
TYP
Settling Time to 0.1%
Overload Recovery Time
NOISE PERFORMANCE
Voltage Noise Density
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, VS = +5V and RL = 200kΩ connected to VS/2, unless otherwise noted.
Small Signal Step Response
Small Signal Step Response
G = +1
CL = 100pF
RL = 200kΩ
20mV/div
50mV/div
G = +1
CL = 100pF
RL = 5kΩ
10μs/div
10μs/div
Large Signal Step Response
Small-Signal Overshoot vs. Load Capacitance
Small-Signal Overshoot (%)
500mV/div
G = +1
CL = 100pF
RL = 200kΩ
60
50
G = -1
RFB = 100kΩ
40
G = +1
RL = 200kΩ
30
20
G = -1
RFB = 5kΩ
10
0
10
100
1000
Load Capacitance (pF)
20μs/div
Small-Signal Overshoot vs. Load Capacitance
Maximum Output Voltage vs. Frequency
6
60
G = -5
RFB = 100kΩ
50
5
Output Voltage (Vp-p)
Small-Signal Overshoot (%)
10000
40
30
20
10
0
VS = 5.5V
4
Maximum Output Voltage
without Slew-Rate
Induced Distortion
VS = 5V
3
2
VS = 2.5V
1
0
10
100
1000
Load Capacitance (pF)
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10000
1
10
100
Frequency (kHz)
1000
4
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, VS = +5V and RL = 200kΩ connected to VS/2, unless otherwise noted.
30
100
25
Supply Current (μA)
Short-Circuit Current (mA)
Supply Current vs. Temperature
Short-Circuit Current vs. Supply Voltage
120
80
60
40
20
0
-20
20
15
10
5
0
0
1
2
3
4
Supply Voltage (V)
5
6
-50
0
25
50
75
100 125 150
Temperature (℃)
Input Voltage Noise Spectral Density
vs. Frequency
1000
-25
CMRR and PSRR vs. Frequency
100
CMRR,PSRR (dB)
Voltage Noise (nV/√Hz)
90
100
80
70
60
CMRR
50
40
PSRR
30
20
10
10
0.01
0.1
1
10
0
0.01
100
0.1
1
10
100
Frequency (kHz)
Frequency (kHz)
10000
Output Voltage Swing vs. Output Current
Output Voltage Swing vs. Output Current
6
135℃
3
25℃
2.5
2
Sourcing Current
Sourcing Current
5
Output Voltage (V)
3.5
Output Voltage (V)
1000
-55℃
VS = 3V
1.5
1
-55℃
0.5
135℃
0
0
10
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50
4
3
-55℃
2
-55℃
135℃
0
60
25℃
VS = 5V
1
25℃ Sinking Current
20
30
40
Output Current (mA)
135℃
0
20
40
25℃ Sinking Current
60
80 100 120 140 160
Output Current (mA)
5
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, VS = +5V and RL = 200kΩ connected to VS/2, unless otherwise noted.
Overload Recovery Time
Open–Loop Voltage Gain (dB)
Vs = 5V
G = -10
VIN = 250mV
2.5V
Open-Loop Voltage Gain vs. Temperature
140
0V
250mV
0V
130
RL = 5kΩ
120
RL = 100kΩ
110
100
90
80
-50
Time (20μs/div)
90
-VS < VCM < (+VS)
70
60
75
100 125 150
Typical production
distribution of
packaged units.
36
32
28
24
20
16
12
8
4
Temperature (℃)
3
2
2.5
1
1.5
Offset Voltage (mV)
Power Supply Rejection Ratio
vs. Temperature
140
0
100 125 150
0.5
75
-1
50
-0.5
25
-1.5
0
-2
-25
-3
0
-50
Supply Current vs. Supply Voltage
30
RL = 100kΩ
Supply Current (μA)
130
PSRR (dB)
50
Offset Voltage Production Distribution
-2.5
CMRR (dB)
-VS < VCM < (+VS) - 1.5V
80
25
40
Percentage of Amplifiers (%)
RL = 100kΩ
110
100
0
Temperature (℃)
Common Mode Rejection Ratio
vs. Temperature
120
-25
120
110
100
90
25
20
15
10
5
80
0
-50
-25
0
25
50
75
Temperature (℃)
SG Micro Corp
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100 125 150
0
1
2
3
4
Supply Voltage (V)
5
6
6
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
APPLICATION NOTES
Driving Capacitive Loads
Power-Supply Bypassing and Layout
The SGM8531/2/4 can directly drive 250pF in unity-gain without
oscillation. The unity-gain follower (buffer) is the most sensitive
configuration to capacitive loading. Direct capacitive loading
reduces the phase margin of amplifiers and this results in
ringing or even oscillation. Applications that require greater
capacitive driving capability should use an isolation resistor
between the output and the capacitive load like the circuit in
Figure 1. The isolation resistor RISO and the load capacitor CL
form a zero to increase stability. The bigger the RISO resistor
value, the more stable VOUT will be. Note that this method
results in a loss of gain accuracy because RISO forms a voltage
divider with the RLOAD.
The SGM8531/2/4 family operates from either a single +2.1V to
+5.5V supply or dual ±1.05V to ±2.75V supplies. For
single-supply operation, bypass the power supply +VS with a
0.1µF ceramic capacitor which should be placed close to the
+VS pin. For dual-supply operation, both the +VS and the -VS
supplies should be bypassed to ground with separate 0.1µF
ceramic capacitors. 2.2µF tantalum capacitor can be added for
better performance.
+VS
+VS
10µF
10µF
0.1µF
0.1µF
RISO
SGM8531
Vn
VOUT
VIN
Vn
CL
SGM8531
VOUT
VOUT
SGM8531
Vp
10µF
Vp
Figure 1. Indirectly Driving Heavy Capacitive Load
An improved circuit is shown in Figure 2. It provides DC
accuracy as well as AC stability. RF provides the DC accuracy
by connecting the inverting signal with the output. CF and RIso
serve to counteract the loss of phase margin by feeding the
high frequency component of the output signal back to the
amplifier’s inverting input, thereby preserving phase margin in
the overall feedback loop.
0.1µF
-VS(GND)
-VS
Figure 3. Amplifier with Bypass Capacitors
CF
RF
RISO
SGM8531
VIN
VOUT
CL
RL
Figure 2. Indirectly Driving Heavy Capacitive Load with DC
Accuracy
For non-buffer configuration, there are two other ways to
increase the phase margin: (a) by increasing the amplifier’s
gain or (b) by placing a capacitor in parallel with the feedback
resistor to counteract the parasitic capacitance associated with
inverting node.
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
TYPICAL APPLICATION CIRCUITS
Differential Amplifier
Low Pass Active Filter
The circuit shown in Figure 4 performs the difference function. If
the resistor ratios are equal to (R4 / R3 = R2 / R1), then
VOUT = (Vp - Vn) × R2 / R1 + VREF.
The low pass filter shown in Figure 6 has a DC gain of (-R2 / R1)
and the -3dB corner frequency is 1/2R2C. Make sure the filter
bandwidth is within the bandwidth of the amplifier. The large
values of feedback resistors can couple with parasitic
capacitance and cause undesired effects such as ringing or
oscillation in high-speed amplifiers. Keep resistor values as low
as possible and consistent with output loading consideration.
R2
R1
Vn
SGM8531
C
VOUT
Vp
R2
R3
VIN
R4
R1
SGM8531
VREF
VOUT
Figure 4. Differential Amplifier
R3 = R1 // R2
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that in
Figure 4 but with a high input impedance.
Figure 6. Low Pass Active Filter
R2
R1
SGM8531
Vn
SGM8531
Vp
R3
VOUT
R4
SGM8531
VREF
Figure 5. Instrumentation Amplifier
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
PACKAGE OUTLINE DIMENSIONS
SOT-23-5
1.90
D
e1
E1
2.59
E
0.99
b
e
0.95
0.69
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
c
0.2
Dimensions
In Inches
MIN
MAX
A
1.050
1.250
0.041
0.049
A1
0.000
0.100
0.000
0.004
A2
1.050
1.150
0.041
0.045
b
0.300
0.500
0.012
0.020
c
0.100
0.200
0.004
0.008
D
2.820
3.020
0.111
0.119
E
1.500
1.700
0.059
0.067
E1
2.650
2.950
0.104
0.116
e
0.950 BSC
e1
0.037 BSC
1.900 BSC
0.075 BSC
L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
PACKAGE OUTLINE DIMENSIONS
SOIC-8
0.6
D
e
2.2
E1
E
5.2
b
1.27
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
c
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
1.350
1.750
0.053
0.069
A1
0.100
0.250
0.004
0.010
A2
1.350
1.550
0.053
0.061
b
0.330
0.510
0.013
0.020
c
0.170
0.250
0.006
0.010
D
4.700
5.100
0.185
0.200
E
3.800
4.000
0.150
0.157
E1
5.800
6.200
0.228
0.244
e
1.27 BSC
0.050 BSC
L
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
PACKAGE OUTLINE DIMENSIONS
MSOP-8
b
E1
E
4.8
1.02
e
0.41
0.65
RECOMMENDED LAND PATTERN (Unit: mm)
D
L
A
c
A1
θ
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
0.820
1.100
0.032
0.043
A1
0.020
0.150
0.001
0.006
A2
0.750
0.950
0.030
0.037
b
0.250
0.380
0.010
0.015
c
0.090
0.230
0.004
0.009
D
2.900
3.100
0.114
0.122
E
2.900
3.100
0.114
0.122
E1
4.750
5.050
0.187
0.199
e
0.650 BSC
0.026 BSC
L
0.400
0.800
0.016
0.031
θ
0°
6°
0°
6°
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
PACKAGE OUTLINE DIMENSIONS
TSSOP-14
D
E1
E
5.94
1.78
b
e
0.42
0.65
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
1.100
0.043
A
A1
c
H
0.050
0.150
0.002
0.006
A2
0.800
1.000
0.031
0.039
b
0.190
0.300
0.007
0.012
c
0.090
0.200
0.004
0.008
D
4.900
5.100
0.193
0.201
E
4.300
4.500
0.169
0.177
E1
6.250
6.550
0.246
0.258
e
L
0.650 BSC
0.500
H
θ
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0.026 BSC
0.700
0.02
0.25 TYP
1°
0.028
0.01 TYP
7°
1°
7°
13
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
PACKAGE OUTLINE DIMENSIONS
SOIC-14
D
INDEX Ф0.8±0.1
DEP 0.2±0.1
E
5.2
E1
Ф2.0±0.1 BTM E-MARK
DEP 0.1±0.05
2.2
e
b
0.6
1.27
RECOMMENDED LAND PATTERN (Unit: mm)
L1
A A2
Dimensions In Millimeters
MIN
MOD
L2
θ
A1
Symbol
h
L
R1
R
A3
h
MAX
Dimensions In Inches
MIN
MOD
MAX
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
A2
1.25
1.65
0.049
0.065
A3
0.55
0.75
0.022
0.030
b
0.36
0.49
0.014
0.019
D
8.53
8.73
0.336
0.344
E
5.80
6.20
0.228
0.244
E1
3.80
4.00
0.150
e
L
1.27 BSC
0.45
0.157
0.050 BSC
0.80
0.018
0.032
L1
1.04 REF
0.040 REF
L2
0.25 BSC
0.01 BSC
R
0.07
0.003
R1
0.07
0.003
h
0.30
0.50
0.012
0.020
θ
0°
8°
0°
8°
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500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
W
P0
Q1
Q2
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
Q3
Q4
B0
Reel Diameter
P1
A0
K0
DIRECTION OF FEED
Reel Width (W1)
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Package Type
Reel Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
SOT-23-5
7’’
9.5
3.17
3.23
1.37
4.0
4.0
2.0
8.0
Q3
SOIC-8
13″
12.4
6.4
5.4
2.1
4.0
8.0
2.0
12.0
Q1
MSOP-8
13″
12.4
5.2
3.3
1.5
4.0
8.0
2.0
12.0
Q1
SOIC-14
13″
16.4
6.6
9.3
2.1
4.0
8.0
2.0
16.0
Q1
TSSOP-14
13″
12.4
6.95
5.6
1.2
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
www.sg-micro.com
13
500kHz, 18μA, Rail-to-Rail I/O
CMOS Operational Amplifiers
SGM8531/2/4
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Reel Type
Length
(mm)
Width
(mm)
Height
(mm)
Pizza/Carton
7” (Option)
368
227
224
8
7”
442
410
224
18
13”
386
280
370
5
SG Micro Corp
www.sg-micro.com
13
工商网监
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