ADVANCED DATASHEET
SGM8477-1
1.8V, Low Noise,
Zero-Drift Operational Amplifier
PRODUCT DESCRIPTION
The SGM8477-1 CMOS operational amplifier provides
very low offset voltage, low noise and zero-drift over
time and temperature for precise differential signal
process.
The miniature, high-precision, low quiescent current
amplifier offers high-impedance rail to rail inputs that
have a wide input common mode range 100mV beyond
the rails and rail-to-rail output that swings within 6.5mV
of the rails. Single or dual supplies as low as +1.8V
(±0.9V) and up to +5.5V (±2.75V) may be used. It is
optimized for low voltage, single-supply operation.
SGM8477-1 is a high performance amplifier for
accurate high side current sensing of low voltage, such
as single battery voltage, or accurate low side current
sensing.
Integrated matched resistors for differential application
save external components. The SGM8477-1 has
different versions for 50, 300 gains.
The SGM8477-1 is available in Green SC70-6 package.
It is specified over -40℃ to +125℃ temperature range.
FEATURES
Low Offset Voltage: 3.5μV (TYP)
Low 0.1Hz to 10Hz Noise: 250nV
P-P
Quiescent Current: 380μA (TYP)
Low Noise: 10nV/
Hz
Integrated RFI Filter
Single-Supply Operation
Supply Voltage Range: 1.8V to 5.5V
Rail-to-Rail Input and Output
-40℃ to +125℃ Operating Temperature Range
SGM8477-1 is Available in Green SC70-6
Package
APPLICATIONS
Transducer Applications
Temperature Measurements
Electronic Scales
Medical Instrumentation
Battery-Powered Instrument
Handheld Test Equipment
SG Micro Corp
www.sg-micro.com
SEPTEMBER 8, 2016
SGM8477-1
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
1.8V, Low Noise,
Zero-Drift Operational Amplifier
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
SGM8477-1B
SC70-6
-40℃ to +125℃
(Gain = 50)
SGM8477-1G
SC70-6
-40℃ to +125℃
(Gain = 300)
NOTE: XX = Date Code. XXXXX = Date Code and Vendor Code.
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
Supply Voltage................................................................... 6V
Input Common Mode Voltage Range
.................................................... (-V
S
) - 0.3V to (+V
S
) + 0.3V
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering 10sec) .........................+260℃
ABSOLUTE MAXIMUM RATINGS
OVERSTRESS CAUTION
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any other conditions beyond those indicated in the
operational section of the specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
ESD SENSITIVITY CAUTION
RECOMMENDED OPERATING CONDITIONS
Specified Voltage Range ....................................1.8V to 5.5V
Operating Temperature Range ..................... -40℃ to +125℃
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.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, specification or other related things if
necessary without notice at any time.
PIN CONFIGURATION
SGM8477-1 (TOP VIEW)
REF
1
6
R
1
R
2
OUT
-V
S
2
-
+
5
-IN
+V
S
3
R
2
R
1
4
+IN
SC70-6
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2016
2
SGM8477-1
ELECTRICAL CHARACTERISTICS
1.8V, Low Noise,
Zero-Drift Operational Amplifier
(At T
A
= +25℃, V
S
= 5V, V
REF
= +V
S
/2 and R
L
= 10kΩ to +V
S
/2, unless otherwise noted.)
PARAMETER
INPUT CHARACTERISTICS
Input Offset Voltage (V
OS
)
Input Bias Current (I
B
)
Input Offset Current (I
OS
)
Input Common Mode Voltage Range (V
CM
)
Common Mode Rejection Ratio (CMRR)
OUTPUT CHARACTERISTICS
Output Voltage Swing from Rail
Short-Circuit Current (I
SC
)
POWER SUPPLY
Operating Voltage Range (V
S
)
Power Supply Rejection Ratio (PSRR)
Quiescent Current (I
Q
)
DYNAMIC PERFORMANCE
Slew Rate (SR)
-3dB Bandwidth
Gain Error
NOISE
Input Voltage Noise
Input Voltage Noise Density (e
n
)
f = 0.1Hz to 10Hz
f = 1kHz
0.25
10
μV
P-P
nV/
Hz
V
O
= 2V
PP
V
S
= +5V, C
L
= 50pF, GAIN = 300
V
S
= +5V, C
L
= 50pF, GAIN = 50
V
S
= +5V,
0.1V ≤
V
OUT
≤ 4.9V
0.15
37
150
0.01
V/μs
kHz
kHz
%
V
S
= +1.8V to +5.5V
Io = 0, EN = 1.8V (active), +V
S
= 5.0V, -V
S
= 0V
1.8
120
380
5.5
V
dB
μA
R
L
= 10kΩ
V
S
= 5V
6.5
45.0
mV
mA
(-V
S
) - 0.1V < V
CM
< (+V
S
) + 0.1V
V
S
= +5V
V
S
= V
CM
= +5V, V
REF
= 0V, Gain = 300
V
S
= V
CM
= +5V, V
REF
= 0V, Gain = 50
V
S
= V
CM
= +5V, V
REF
= 0V, Gain = 300
V
S
= V
CM
= +5V, V
REF
= 0V, Gain = 50
(-V
S
) - 0.1
100
3.5
17
110
3
16
(+V
S
) + 0.1
μV
μA
μA
μA
μA
V
dB
CONDITIONS
MIN
TYP
MAX
UNITS
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2016
3
SGM8477-1
APPLICATION INFORMATION
The SGM8477-1 provides low offset voltage and very
low drift over time and temperature. For lowest offset
voltage and precision performance, circuit layout and
mechanical conditions should be optimized. Avoid
temperature gradients that create thermoelectric
(Seebeck) effects in the thermocouple junctions
formed from connecting dissimilar conductors. These
thermally-generated potentials can be made to cancel
by assuring they are equal on both input terminals.
Other layout and design considerations include:
• Use low thermoelectric-coefficient
conditions (avoid
dissimilar metals).
• Thermally isolate components from power supplies
or other heat sources.
• Shield
operational amplifier and input circuitry from
air currents, such as cooling fans.
1.8V, Low Noise,
Zero-Drift Operational Amplifier
cause excessive current to flow into or out of the input
pins. The integrated input resistors will limit the
current when input voltage beyond the power
supplies.
Operating Voltage
The SGM8477-1 operational amplifier operates over
a power supply range of +1.8V to +5.5V (±0.9V to
±2.75V). Supply voltages higher than +6V (absolute
maximum) can permanently damage the device.
Input Voltage
Attention to good layout practices is always
recommended. Keep traces short and, when possible,
use a printed circuit board (PCB) ground plane with
surface-mount components placed as close to the
device pins as possible. Place a 0.1μF capacitor
closely across the supply pins. These guidelines
should be applied throughout the analog circuit to
improve performance and provide benefits such as
reducing the EMI (electromagnetic-interference)
susceptibility. Operational amplifiers vary in their
susceptibility to radio frequency interference (RFI).
RFI can generally be identified as a variation in offset
voltage or DC signal levels with changes in the
interfering RF signal. The SGM8477-1 have been
specifically designed to minimize susceptibility to RFI
and demonstrates remarkably low sensitivity
compared to previous generation devices. Strong RF
fields may still cause varying offset levels. The circuit
in Figure1 is for thermocouple signal condition.
A low-side current shunt monitor is shown in Figure 2.
R
N
are operational resistors used to isolate the ADC
2
from the noise of the digital I C bus. Since the ADC is
a 16-bit converter, a precise reference is essential for
maximum accuracy. Related application circuits are
shown in Figure 3 ~ 4.
General Design Guidelines
The SGM8477-1 input common mode voltage range
extends 0.1V beyond the supply rails. The
SGM8477-1 is designed to cover the full range
without the troublesome transition region found in
some other rail-to-rail amplifiers.
Normally, input bias current is about 17μA; however,
input voltages exceeding the power supplies can
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2016
4
SGM8477-1
APPLICATION INFORMATION
5V
12V
0.1μF
+
R
1
10.7kΩ
Voltage Reference
1.8V, Low Noise,
Zero-Drift Operational Amplifier
D1
R
5
40.2kΩ
5V
10μF
+
0.1μF
+
R
2
2.74kΩ
-
+
-
+
R
4
5.62kΩ
R
3
53.6Ω
R
6
200Ω
Zero Adj.
-
SGM8477-1X
V
OUT
REF
K-Type
Thermocouple
40.7μV/℃
+
Figure 1. Thermocouple Temperature Circuit
SGM8706's 1.2V
Voltage Reference
C
1
0.1μF
R
2
V
CC
= 5V
Load
R
3
C
2
= 0.01µF
-
V
BAT
I
LOAD
R
SHUNT
+
+V
S
REF
Comparator
SGM8706
I/O
SGM8477-1X
+
R
1
C
1
CPU
ADC
-
-V
S
Figure 2. Accurate Low-side Current Sensing
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2016
5
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