SGM620 [SGMICRO]
Low Power, Low Noise, Rail-to-Rail Output, Instrumentation Amplifier;
| 型号： | SGM620 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Low Power, Low Noise, Rail-to-Rail Output, Instrumentation Amplifier |
| 文件： | 总19页 (文件大小：1077K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM620
Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
GENERAL DESCRIPTION
FEATURES
The SGM620 is a high accuracy, high voltage
instrumentation amplifier, which is designed to set any
gain from 1 to 10000 with one external resistor. The
device works well in battery-powered applications due to
the low power consumption of 1.3mA typical quiescent
current. The SGM620 provides a SOIC-8 package which
is much smaller than discrete classical-three-OPAs
circuits.
● Single External Resistor Gain Set
(Set Gain from 1 to 10000)
● Input Offset Voltage: 150μV (MAX)
● Input Bias Current: 15nA (TYP)
● Common Mode Rejection Ratio: 105dB (TYP) (G = 10)
● Input Voltage Noise: 6nV/ Hz at 1kHz
√
● 0.1Hz to 10Hz Voltage Noise: 0.4μVP-P
● Bandwidth: 140kHz (G = 100)
● Settling Time to 0.01%: 10μs (G = 100)
● Rail-to-Rail Output
The SGM620 provides 120ppm (MAX) non-linearity
and 150μV (MAX) low input offset voltage. The device
also features low noise, low bias current and low power.
The combination of these characteristics makes it a
good choice for applications requiring excellent DC
performance.
● Support Single or Dual Power Supplies:
4.6V to 36V or ±2.3V to ±18V
● Low Power Supply Current: 1.3mA (TYP)
● -40℃ to +125℃ Operating Temperature Range
● Available in a Green SOIC-8 Package
The SGM620 offers 6nV/ Hz low input voltage noise,
√
300fA/ Hz input current noise at 1kHz, and 0.4μVP-P in
√
APPLICATIONS
the 0.1Hz to 10Hz band. It is suitable for pre-amplifier
applications. The 10μs settling time to 0.01% makes
SGM620 appropriate for multiplexed applications.
Precision Current Measurement
Pressure Measurement
The SGM620 is available in a Green SOIC-8 package.
It is specified over the extended -40℃ to +125℃
temperature range.
SG Micro Corp
JUNE 2022 – REV. A. 2
www.sg-micro.com
Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGM
SGM620
SOIC-8
SGM620XS8G/TR
620XS8
XXXXX
Tape and Reel, 4000
-40℃ to +125℃
MARKING INFORMATION
XXXXX = Date Code, Trace Code and Vendor Code.
X X X X X
Vendor Code
Trace Code
Date Code - Year
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.
ABSOLUTE MAXIMUM RATINGS
ESD SENSITIVITY CAUTION
Supply Voltage, +VS to -VS...............................................40V
Input Common Mode Voltage .......................................... ±VS
Junction Temperature .................................................+150℃
Storage Temperature Range........................-65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................7000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Operating Temperature Range .....................-40℃ to +125℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
OVERSTRESS CAUTION
circuit design, or specifications without prior notice.
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
SG Micro Corp
www.sg-micro.com
JUNE 2022
2
Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
PIN CONFIGURATION
(TOP VIEW)
RG
IN-
1
2
3
4
8
7
6
5
RG
_
+VS
OUT
REF
IN+
-VS
+
SOIC-8
PIN DESCRIPTION
PIN
1, 8
2
NAME
RG
FUNCTION
Gain Setting Pin. The gain can be set by placing the resistor across RG.
G = 1 + (49.4kΩ/RG).
IN-
Inverting Input Pin.
3
IN+
Non-Inverting Input Pin.
Negative Power Supply Pin.
4
-VS
Voltage Reference Pin. A voltage source with low impedance can be placed to supply this
terminal in order to shift the output level.
5
REF
OUT
+VS
6
Output Pin.
7
Positive Power Supply Pin.
SG Micro Corp
www.sg-micro.com
JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
ELECTRICAL CHARACTERISTICS
(VS = ±15V, RL = 2kΩ, Full = -40℃ to +125℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
Gain (G = 1 + (49.4kΩ/RG))
Gain Range
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
1
10000
0.1
0.01
0.15
0.15
0.15
+25℃
Full
G = 1
0.15
0.3
+25℃
Full
G = 10
G = 100
G = 1000
0.6
Gain Error (1)
GE
VOUT = -10V to +10V
%
0.3
+25℃
Full
0.6
0.6
+25℃
Full
0.8
G = 1
G > 1
Full
1
Gain Temperature Coefficient
ppm/℃
ppm
Full
20
10
70
100
70
+25℃
Full
G = 1
10
10
20
+25℃
Full
G = 10
G = 100
G = 1000
100
70
Non-Linearity
VOUT = -10V to +10V
+25℃
Full
100
120
170
+25℃
Full
Voltage Offset (Total RTI Error = VOSI + VOSO/G)
50
150
200
+25℃
Full
Input Offset Voltage
VOSI
VS = ±5V to ±15V
µV
µV/℃
µV
Input Offset Voltage Drift
Output Offset Voltage
Output Offset Voltage Drift
∆VOSI/∆T
VOSO
Full
0.2
400
1200
1600
+25℃
Full
VS = ±5V to ±15V
∆VOSO/∆T
Full
1.5
µV/℃
105
102
125
122
128
125
128
125
110
+25℃
Full
G = 1
130
140
140
+25℃
Full
G = 10
G = 100
G = 1000
Offset Referred to the Input
vs. Supply
PSRR
VS = ±2.3V to ±18V
dB
+25℃
Full
+25℃
Full
Input Current
15
25
35
+25℃
Input Bias Current
IB
nA
nA/℃
nA
Full
Average Temperature Coefficient
of Input Bias Current
∆IB/∆T
IOS
Full
0.15
5
20
25
+25℃
Full
Input Offset Current
Average Temperature Coefficient
of Input Offset Current
∆IOS/∆T
Full
0.05
nA/℃
NOTE: 1. Effects of external resistor RG is not included.
SG Micro Corp
www.sg-micro.com
JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
ELECTRICAL CHARACTERISTICS (continued)
(VS = ±15V, RL = 2kΩ, Full = -40℃ to +125℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
Input
Differential
ZDIFF
ZCM
10 || 4
10 || 4
+25℃
+25℃
Input
Impedance
GΩ || pF
Common Mode
(-VS) + 1.9
(-VS) + 2.1
(-VS) + 1.9
(-VS) + 2.1
70
(+VS) - 1.2
(+VS) - 1.3
(+VS) - 1.4
(+VS) - 1.4
+25℃
Full
VS = ±2.3V to ±5V
Input Voltage Range
V
+25℃
Full
VS = ±5V to ±18V
85
+25℃
Full
G = 1
67
90
105
120
120
+25℃
Full
G = 10
G = 100
G = 1000
87
Common Mode Rejection Ratio
with 1kΩ Source Imbalance
CMRR
V
CM = -10V to +10V
dB
103
+25℃
Full
100
103
+25℃
Full
100
Reference Input
Reference Input Resistance
RREF
18
30
kΩ
+25℃
40
50
+25℃
Full
Reference Input Current
IREF
VIN+ = VIN- = 0V, VREF = 0V
µA
Output Characteristics
310
150
24
400
600
220
300
+25℃
Full
VOH
VOL
ISC
RL = 2kΩ, VS = ±18V
RL = 2kΩ, VS = ±18V
Output Voltage Swing
mV
+25℃
Full
19
14
+25℃
Full
Short-Circuit Current
Power Supply
VS = ±2.3V to ±18V, RL = 50Ω to VS/2
mA
mA
1.3
1.7
2.2
+25℃
Full
Quiescent Current
Dynamic Response
IQ
VS = ±2.3V to ±18V, IOUT = 0A
G = 1
3900
1000
140
17
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
G = 10
G = 100
G = 1000
Small-Signal -3dB Bandwidth
BW
kHz
Slew Rate
SR
VOUT = 1VP-P Step
VOUT = 10VP-P Step
G = 1
1.2
V/µs
G = 1 to 100
G = 1000
10
Settling Time to 0.01%
tS
µs
51
Noise
Input Voltage Noise Density
eni
f = 1kHz
f = 1kHz
6
80
6
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
nV/√Hz
Output Voltage Noise Density
eno
nV/ Hz
√
G = 1
G = 10
G = 100
G = 1000
1
0.1Hz to 10Hz Voltage Noise, RTI
f = 0.1Hz to 10Hz
µVP-P
0.4
0.4
300
15
Input Current Noise Density, RTI
0.1Hz to 10Hz Current Noise, RTI
in
f = 1kHz
fA/√Hz
f = 0.1Hz to 10Hz
pAP-P
SG Micro Corp
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JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, VS = ±15V, unless otherwise noted.
PSRR vs. Frequency
PSRR vs. Frequency
150
120
90
180
150
120
90
— G = 1
— G = 1
— G = 10
— G = 100
— G = 1000
— G = 10
— G = 100
— G = 1000
60
30
60
0
30
-30
0
0.1
0.01
10
1
10
100
1000
0.1
1
10
100
1000
Frequency (kHz)
Frequency (kHz)
CMRR vs. Frequency
Gain vs. Frequency
200
160
120
80
80
60
40
20
0
RL = 2kΩ
— G = 1
— G = 10
— G = 100
— G = 1000
— G = 1
— G = 10
— G = 100
— G = 1000
40
0
-20
0.1
1
10
100
1000
0.1
1
10
100
1000
10000
Frequency (kHz)
Frequency (kHz)
Input Voltage Noise Density vs. Frequency
Input Common Mode Voltage vs. Output Voltage
1000
100
10
20
15
10
5
— G = 1
— G = 10
— G = 100
— G = 1000
VS = ±15V
0
-5
VS = ±5V
-10
-15
-20
1
100
1000
10000
100000
-20 -15 -10
-5
0
5
10
15
20
Frequency (Hz)
Output Voltage (V)
SG Micro Corp
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JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V, unless otherwise noted.
0.1Hz to 10Hz Input Voltage Noise
0.1Hz to 10Hz Input Voltage Noise
G = 10
G = 1
Time (3s/div)
Time (3s/div)
0.1Hz to 10Hz Input Voltage Noise
0.1Hz to 10Hz Input Voltage Noise
G = 1000
G = 100
Time (3s/div)
Time (3s/div)
Settling Time
Settling Time
15
10
5
15
10
5
15
10
5
1.5
G = 1, RL = 2kΩ
G = 10, RL = 2kΩ
1.0
0.5
Input
Input
Output
Output
0
0
0
0.0
-5
-5
-5
-0.5
-1.0
-1.5
-10
-15
-10
-15
-10
-15
Time (10μs/div)
Time (10μs/div)
SG Micro Corp
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V, unless otherwise noted.
Settling Time
G = 100, RL = 2kΩ
Settling Time
G = 1000, RL = 2kΩ
15
10
5
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
15
10
5
15
10
5
Input
Input
Output
0
0
0
Output
-5
-5
-5
-10
-15
-10
-15
-10
-15
Time (10μs/div)
Time (10μs/div)
Large-Signal Step Response
G = 1, RL = 2kΩ, f = 10kHz
Large-Signal Step Response
G = 10, RL = 2kΩ, f = 10kHz
Time (10μs/div)
Time (10μs/div)
Large-Signal Step Response
Large-Signal Step Response
G = 1000, RL = 2kΩ, f = 1kHz
G = 100, RL = 2kΩ, f = 5kHz
Time (20μs/div)
Time (100μs/div)
SG Micro Corp
www.sg-micro.com
JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V, unless otherwise noted.
Small-Signal Step Response
G = 1, RL = 2kΩ, f = 50kHz
Small-Signal Step Response
G = 10, RL = 2kΩ, f = 50kHz
Time (2μs/div)
Time (2μs/div)
Small-Signal Step Response
Input Offset Voltage Production Distribution
25
20
15
10
5
G = 100, RL = 2kΩ, f = 10kHz
3120 Samples
1 Production Lot
0
Time (10μs/div)
Input Offset Voltage (μV)
Output Offset Voltage Production Distribution
Input Offset Current Production Distribution
25
20
15
10
5
30
25
20
15
10
5
3120 Samples
1 Production Lot
3120 Samples
1 Production Lot
0
0
Output Offset Voltage (μV)
Input Offset Current (nA)
SG Micro Corp
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JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V, unless otherwise noted.
Input Bias Current Production Distribution
25
3120 Samples
1 Production Lot
20
15
10
5
0
Input Bias Current (nA)
SG Micro Corp
www.sg-micro.com
JUNE 2022
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
OPERATION THEORY
The SGM620 is modified with the classic three-op-amp and it is a holistic instrumentation amplifier.
IN+
+VS
R4
400Ω
Q2
20μA
18kΩ
18kΩ
C2
A2
REF
_
R2
+
+
A3
OUT
+VS
VB
RG
-VS
_
+
R1
A1
_
18kΩ
18kΩ
C1
20μA
Q1
R3
400Ω
+VS
IN-
Figure 1. Simplified Schematic
The gain-bandwidth product which is determined by
the two capacitors C1, C2 and the transconductance of
the pre-amplifier can increase with programmed gain,
so that the frequency response is enhanced.
The high precision input is provided by the two input
transistor Q1 and Q2 (Figure 1) and this results in 10 ×
lower bias current of the input pins. The constant
collector current of Q1 and Q2 is maintained by the two
loops Q1-A1-R1 and Q2-A2-R2, so the input voltage is
impressed across the gain setting resistor RG of the
amplifier. The differential gain from A1/A2 outputs can
be expressed by G = 1+ (R1+R2)/RG. The unity-gain
subtractor (A3) can reject the common mode signal so
that SGM620 produces a single-ended output with REF
pin biased.
Reducing the input voltage noise to 6nV/ Hz, and it is
√
determined by the base resistance and the collector
current of the input.
The integrated resistors (R1 and R2) inside the SGM620
are set to 24.7kΩ, so that the gain can be programmed
with the external resistor RG.
The equation of gain is shown as below:
The transconductance of the pre-amplifier is determined
by the resistance of RG. The transconductance will
increase gradually to that of the input transistors if the
resistance of RG is reduced for larger gains. The
important benefits are shown below:
49.4kΩ
G =
+ 1
RG
49.4kΩ
RG =
G - 1
Boosting the open-loop gain can also increase the
programmed gain, so that the related error of gain is
reduced.
SG Micro Corp
www.sg-micro.com
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
APPLICATION INFORMATION
Pressure Measurement
SGM620 is widely used in the application of bridge, such as measuring the pressure in weigh scales. It is also
suitable for detecting the pressure sensor with higher resistance due to high input impedance.
Figure 2 shows the pressure transducer bridge of 5kΩ which is powered by a 5V single supply. In such a circuit, the
bridge consumes only 1mA. The buffered voltage divider and SGM620 can condition the output signal with typical
3.3mA supply current.
The advantage of small size for SGM620 is attractive for the transducers of pressure. Because of the low noise and
drift, it can also be used in the application of diagnostic non-invasive blood pressure measurement.
5V
Isolation Barrier
+3.3V
3
8
+
7
40kΩ
20kΩ
CS
5kΩ
5kΩ
5kΩ
5kΩ
REF AVDD DVDD
DVDD
100Ω
6
G = 50
1kΩ
IN
MISO
MOSI
SCK
SGM620
STMS2
F407
ADC
445μA
TYP
100nF
1
2
5
_
AGND
+
SGM8581
40kΩ
50μA
_
1mA
Figure 2. The Operation of the Pressure Monitor Circuit with 5V Single Supply
Medical ECG Amplifier
Because of the advantage of low current noise, SGM620 can be used in ECG monitors (Figure 3) where the source
resistances can reach 1MΩ or higher. It is the best choice to use SGM620 in the battery-powered data recorders as
it can operate on the condition of low supply voltage, low power and space-saving package.
Moreover, for better performance, combining with the advantages of low voltage noise, low current and low bias
currents can enhance the dynamic range of SGM620.
The stability of the right leg drive loop can be maintained by the capacitor C1. Moreover, for protecting the patient
from the possible harm, the isolation safeguards should be added between the patient and the circuit part.
Isolation/Protection Barrier
+5V
3
R1
100kΩ
+
7
8
R4
5kΩ
C1
15pF
R2
49.9kΩ
Output
1V/mV
6
RG
6.2kΩ
G = 111
R5
+
SGM620
0.03Hz
High-Pass
Filter
R3
49.9kΩ
1kΩ
_
G = 9
SGM8210-1
1
2
_
SGM8210-1
+
4
_
-5V
Reject the common voltage at the input of SGM620
Figure 3. The Circuit of Medical ECG Monitor
SG Micro Corp
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
APPLICATION INFORMATION (continued)
Precision V-I Converter
Selection of Gain
It’s easy to realize a precision current source (Figure 4)
utilizing one SGM620, another operational amplifier
and two resistors. To obtain a better CMRR of SGM620,
a buffer should be placed between the REF pin and the
OUT pin of the amplifier. The equation which is shown
in Figure 4 illustrates the output current of the circuit.
The gain of the instrumentation amplifier is determined
by the external resistor RG. The accuracy of the
external resistor RG is important as it may influence the
error of gain. It is recommended that selecting the
resistor with 0.1% or 1% precision is a good choice.
The following table shows the gain effect with the
selection of 1% or 0.1% precision resistor. Also, leaving
the pin 1 and pin 8 (the place of RG) open can make the
gain of SGM620 equals to 1.
+VS
3
VIN+
+
7
8
49.4kΩ
RG =
G - 1
6
RG
SGM620
+
As mentioned before, the gain error can be minimized
by equivalent parasitic resistor in series with RG.
Moreover, low TC of 1ppm/℃ is required for the
selection of RG to avoid the gain drift of SGM620.
VSET RSET
1
2
IL
5
_
_
4
VIN-
+
SGM8581
RLOAD
-VS
_
[(VIN+) - (VIN-)]G
VSET
RSET
Table 1. Different Values for Gain Resistor
IL
=
=
R1
1% STD
Table Value of
RG (Ω)
0.1% STD
Table Value of
RG (Ω)
Calculated
Gain
Calculated
Gain
Figure 4. Precision Voltage-to-Current Converter
49.9k
12.4k
5.49k
2.61k
1.00k
499
1.990
4.984
9.998
19.93
50.40
100.0
199.4
495.0
991.0
49.3k
12.4k
5.49k
2.61k
1.01k
499
2.002
4.984
9.998
19.93
49.91
100.0
199.4
501.0
1003.0
Input and Output Offset Voltage
Two main sources which are error of input and output
result in the low errors of SGM620. When referred to
the input, the output error should be divided by the gain
of the instrumentation amplifier. From the equations
which are shown as below, the input error takes a
leading position at large gains while the output error
takes a leading position at small gains.
249
249
100
98.8
49.9
49.3
Total Error Referred to Input (RTI) = Input Error +
(Output Error/G)
+VS
Total Error Referred to Output (RTO) = (Input Error × G)
+ Output Error
IN+
3
8
+
7
Terminal of Reference
Potential of the reference terminal defines the zero
output voltage. It becomes extremely useful while the
load is not tied to the precise ground of the rest of the
system. The reference terminal provides one way to
bias a precise voltage to the output, and the reference
voltage should be in the range of 2V within the supply
voltages. On top of these, to keep better CMRR, the
parasitic resistor at this pin should be low.
6
RG
OUT
SGM620
1
2
5
REF
_
4
IN-
-VS
Figure 5. Diode for Protecting VIN from Larger than VS
SG Micro Corp
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Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
APPLICATION INFORMATION (continued)
RF Interference
Common Mode Rejection
One of the characteristics of instrumentation amplifier is
rectifying the small signal which is out of the band. This
kind of disturbance can be described as the small
biased voltage. All of the high frequency components
can be filtered by the R-C network which is placed in
the input position of the instrumentation amplifier, as
shown in Figure 6. The following equation shows the
equation of filtering frequency for the differential and
common mode part of the input signal.
The common mode rejection ratio of the instrumentation
amplifier is high as it can measure the differential signal
between the two inputs when both IN+ and IN- increase
or decrease equally. Also, this specification can be
defined in the whole range of input voltage.
To obtain a best CMRR, it is recommended that the
REF pin should be connected to a low impedance input
and the difference of impedance between two inputs
should be as small as possible. Also, using shielded
cable can effectively reduce the noise of the circuit, and
it should be driven properly for better value of CMRR.
The following two figures (Figure 7 and Figure 8)
illustrate the method to increase the CMRR for
alternating circuit by bootstrapping the capacitance of
the shielded cable, and this kind of method can also
reduce the mismatching of capacitance at the inputs.
1
FilterFreqDIFF
=
2πR 2C + C
(
)
D
C
1
FilterFreqCM
=
2πRCC
CD ≥ 10CC is required in the above equation.
The capacitor CD influences the quality of the differential
signal, while CC influences the quality of the common
mode signal. The common mode rejection ratio would
be reduced if the R × CC is mismatched. To reduce this
negative influence and obtain a good CMRR, it is
recommended that the capacitance of CD should be 10
times larger than CC. To conclude, the larger the ratio of
CD:CC is, the less negative influence to the circuit.
+VS
RISO
49.9Ω
+
IN+
3
8
+
7
SGM8210-2
_
OUT
6
RG
SGM620
_
RISO
49.9Ω
5
1
2
+5V
REF
SGM8210-2
+
4
_
IN-
-VS
100nF
10μF
Figure 7. Differential Input Shield Driving
CC
CD
CC
RFIRT
IN+
3
8
7
+
+VS
IN+
3
+
7
8
6
OUT
RG
SGM620
R1
49.9kΩ
OUT
6
RG
499Ω
1
2
+
SGM620
RISO
50Ω
5
R2
RFIRT
REF
_
49.9kΩ
SGM8210-1
5
1
2
4
REF
IN-
_
4
_
IN-
100nF
10μF
-5V
-VS
Figure 8. Common Mode Input Shield Driving
Figure 6. One Method to Reduce the Interference of RF
SG Micro Corp
www.sg-micro.com
JUNE 2022
14
Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
APPLICATION INFORMATION (continued)
and DGND. Also, the isolation can be made by using a
Isolation of Grounding
single line or 0Ω resistor. However, each returns of
ground should be separated so that the current flow
from the sensitive point could be minimized. Also, the
ground returns between analog and digital should be
tied together with one point, which is shown in ADC part
of Figure 9.
For solving the problems of grounding, REF pin should
be connected to the "local ground" as the output of the
instrumentation amplifier is biased with VREF
.
Because of the noisy environment of the digital circuit,
the component of data-acquisition such as Analog
Digital Converter (ADC) has two pins which are AGND
Analog
Digital
Power Supply
Power Supply
+10V GND -10V
GND +3.3V
100nF
100nF
100nF 100nF
100nF
+
7
3
2
+
+VCC
-VCC
AVDD GND AVSS GND DVDD
4
6
S/H
ADC
To MCU
IN
GND
OUT
SGM620
_
5
Figure 9. Isolation of Grounding
+VS
Return of Grounding for IB
IN+
The bias current (IB) at the inputs is needed for
operating and biasing the transistor at the input stage of
the instrumentation amplifier, so it is also necessary to
design a ground return path for the bias current. For
example, for operating the floating inputs of the
amplifier (see Figure 10 ~ 12), such as AC-coupled
transformer, there should be an electrical line between
the input and the ground for ground return of bias
current.
3
8
+
7
6
RG
OUT
SGM620
5
1
2
REF
4
_
IN-
-VS
To the Ground of
Power Supply
Figure 11. Return of Grounding for IB with Thermocouple
Inputs
+VS
IN+
3
+
7
8
RFILT
10kΩ
IN+
3
+
6
RG
499Ω
CFILT
OUT
8
SGM620
1
2
5
AC
Coupled
6
REF
RG
OUT
SGM620
4
_
IN-
5
1
2
-VS
CFILT
REF
_
To the Ground of
Power Supply
IN-
RFILT
10kΩ
To the Ground of
Power Supply
Figure 10. Return of Grounding for IB with
Transformer-Coupled Inputs
Figure 12. Return of Grounding for IB with AC-Coupled
Input
SG Micro Corp
www.sg-micro.com
JUNE 2022
15
Low Power, Low Noise, Rail-to-Rail
Output, Instrumentation Amplifier
SGM620
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JUNE 2022 ‒ REV.A.1 to REV.A.2
Page
Updated Terminal of Reference section.............................................................................................................................................................13
MARCH 2022 ‒ REV.A to REV.A.1
Page
Updated Electrical Characteristics section...........................................................................................................................................................5
Changes from Original (MARCH 2022) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JUNE 2022
16
PACKAGE INFORMATION
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
c
θ
A2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
1.750
0.250
1.550
0.510
0.250
5.100
4.000
6.200
MIN
MAX
0.069
0.010
0.061
0.020
0.010
0.200
0.157
0.244
A
A1
A2
b
1.350
0.100
1.350
0.330
0.170
4.700
3.800
5.800
0.053
0.004
0.053
0.013
0.006
0.185
0.150
0.228
c
D
E
E1
e
1.27 BSC
0.050 BSC
L
0.400
0°
1.270
8°
0.016
0°
0.050
8°
θ
NOTES:
1. Body dimensions do not include mode flash or protrusion.
2. This drawing is subject to change without notice.
SG Micro Corp
TX00010.000
www.sg-micro.com
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
SOIC-8
13″
12.4
6.40
5.40
2.10
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
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