SGM8634
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
GENERAL DESCRIPTION
FEATURES
The quad SGM8634 is a low noise, low voltage and low
power operational amplifier that can be designed into a
wide range of applications. The SGM8634 has a high
gain-bandwidth product of 6MHz, a slew rate of 3.7V/μs
and a quiescent current of 470μA/amplifier at 5V.
The
SGM8634
is
designed
to
provide
optimal
performance in low voltage and low noise systems. It
provides rail-to-rail output swing into heavy loads. The
input common mode voltage range includes ground,
and the maximum input offset voltage is 3.5mV. The
operating range is from 2.5V to 5.5V.
The quad SGM8634 is available in Green TSSOP-14
and SOIC-14 packages. It is specified over the extended
-40℃ to +125℃ industrial temperature range.
Rail-to-Rail Input and Output
Input Offset Voltage: 3.5mV (MAX)
High Gain-Bandwidth Product: 6MHz
High Slew Rate: 3.7V/μs
Settling Time to 0.1% with 2V Step: 2.1μs
Overload Recovery Time: 0.9μs
Low Noise: 12nV/
Hz
Supply Voltage Range: 2.5V to 5.5V
Input Voltage Range: -0.1V to 5.6V with VS = 5.5V
Low Supply Current: 470μA/Amplifier (TYP)
-40℃ to +125℃ Operating Temperature Range
Available in Green TSSOP-14 and SOIC-14 Packages
APPLICATIONS
Sensors
Audio
Active Filters
A/D Converters
Communications
Test Equipment
Cellular and Cordless Phones
Laptops and PDAs
Photodiode Amplification
Battery-Powered Instrumentation
SG Micro Corp
www.sg-micro.com
DECEMBER 2015 – REV. C. 2
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
TSSOP-14
-40℃ to +125℃
SGM8634XTS14/TR
SGM8634
XTS14
XXXXX
Tape and Reel, 3000
SOIC-14
-40℃ to +125℃
SGM8634XS14/TR
SGM8634XS14
XXXXX
Tape and Reel, 2500
SGM8634
MARKING INFORMATION
NOTE: XXXXX = Date Code and Vendor Code.
TSSOP-14/SOIC-14
XXXXX
Vendor Code
Date Code - Week
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
Supply Voltage, +VS to -VS ................................................ 6V
Input Common Mode Voltage Range
.................................................... (-VS) - 0.3V to (+VS) + 0.3V
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 1500V
MM ................................................................................. 400V
RECOMMENDED OPERATING CONDITIONS
Operating Temperature Range ................... .-40℃ to +125℃
PIN CONFIGURATIONS
(TOP VIEW)
OUTA
1
14
OUTD
-INA
2
13
-IND
+INA
3
12
+IND
+VS
4
11
-VS
+INB
5
10
+INC
-INB
6
9
-INC
OUTB
7
8
OUTC
OVERSTRESS CAUTION
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.
ESD SENSITIVITY 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.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
TSSOP-14/SOIC-14
SG Micro Corp
www.sg-micro.com
DECEMBER 2015
2
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
ELECTRICAL CHARACTERISTICS
(At TA = +25℃, VS = 5V, VCM = VS/2, RL = 600Ω, unless otherwise noted.)
SGM8634
PARAMETER
CONDITIONS
TYP
MIN/MAX OVER TEMPERATURE
+25℃
+25℃
0.8
3.5
0℃ to
-40℃ to
-40℃ to
+70℃
+85℃
+125℃
3.9
4.3
4.6
UNITS
MIN /
MAX
mV
MAX
Input Characteristics
Input Offset Voltage (VOS)
Input Bias Current (IB)
1
pA
TYP
Input Offset Current (IOS)
1
pA
TYP
-0.1 to
5.6
V
TYP
MIN
Input Common Mode Voltage Range
VS = 5.5V
(VCM)
Common Mode Rejection Ratio (CMRR)
Open-Loop Voltage Gain (AOL)
VS = 5.5V, VCM = -0.1V to 4V
90
73
70
70
65
dB
dB
MIN
90
87
86
79
dB
MIN
VS = 5.5V, VCM = -0.1V to 5.6V
83
RL = 600Ω ,VOUT = 0.15V to 4.85V
97
RL = 10kΩ ,VOUT = 0.05V to 4.95V
108
dB
MIN
2.4
μV/℃
TYP
RL = 600Ω
0.1
V
TYP
RL = 10kΩ
0.015
Input Offset Voltage Drift (ΔVOS/ΔT)
Output Characteristics
Output Voltage Swing from Rail
Output Current (IOUT)
Closed-Loop Output Impedance
53
f = 200kHz, G = +1
49
45
40
35
3
V
TYP
mA
MIN
Ω
TYP
Power Supply
Operating Voltage Range
2.5
2.5
2.5
2.5
V
MIN
5.5
5.5
5.5
5.5
V
MAX
Power Supply Rejection Ratio (PSRR)
VS = 2.5V to 5.5V,
VCM = (-VS) + 0.5V
91
74
72
72
68
dB
MIN
Quiescent Current/Amplifier (IQ)
IOUT = 0
470
650
727
750
815
μA
MAX
Dynamic Performance
Gain-Bandwidth Product (GBP)
RL = 10kΩ
6
MHz
TYP
60
degrees
TYP
< 1% distortion, RL = 600Ω
250
kHz
TYP
Slew Rate (SR)
G = +1, 2V Step, RL = 10kΩ
3.7
V/μs
TYP
Settling Time to 0.1% (tS)
G = +1, 2V Step, RL = 600Ω
2.1
μs
TYP
Overload Recovery Time
VIN ·G = VS, RL = 600Ω
0.9
μs
TYP
Input Voltage Noise Density (en)
f = 1kHz
12
nV/
Hz
TYP
Input Current Noise Density (in)
f = 1kHz
3
fA/
Hz
TYP
Phase Margin (φO)
Full Power Bandwidth (BWP)
Noise Performance
SG Micro Corp
www.sg-micro.com
DECEMBER 2015
3
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, VCM = VS/2, RL = 600Ω, unless otherwise noted.
Closed-Loop Output Voltage Swing
6
VS = 5V
VIN = 4.9VP-P
TA = +25℃
RL = 10kΩ
G=1
4
3
2
1
100
80
60
40
G = 100
G = 10
20
10
100
1000
10000
0
1
10
100
1000
Frequency (kHz)
Frequency (kHz)
Positive Overload Recovery
Negative Overload Recovery
VOUT
0V
0V
0V
VOUT
VS = ±2.5V
VIN = +200mVP-P
(RET to GND)
CL = 0pF
RL = 10kΩ
G = 100
Time (0.3µs/div)
Time (0.3µs/div)
Large-Signal Step Response
Small-Signal Step Response
Voltage (1V/div)
VS = 5V
G = +1
CL = 100pF
RL = 10kΩ
Time (1μs/div)
SG Micro Corp
www.sg-micro.com
10000
VIN
VS = ±2.5V
VIN = -200mVP-P
(RET to GND)
CL = 0pF
RL = 10kΩ
G = 100
G=1
200mV/div 1V/div
200mV/div 1V/div
0V
VIN
VS = 5V
G = +1
CL = 100pF
RL = 10kΩ
Voltage (50mV/div)
0
VS = 5V
120
Output Impedance (Ω)
Output Voltage (VP-P)
5
Output Impedance vs. Frequency
140
Time (1μs/div)
DECEMBER 2015
4
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VCM = VS/2, RL = 600Ω, unless otherwise noted.
PSRR vs. Frequency
120
VS = 5V
VS = 5V
100
CMRR (dB)
100
PSRR (dB)
CMRR vs. Frequency
120
80
60
40
80
60
40
20
20
0.01
0.1
1
10
100
0
0.01
1000
0.1
1
Frequency (kHz)
Channel Separation (dB)
Small-Signal Overshoot (%)
50
+OS
40
30
-OS
20
10
0
1
10
100
130
120
110
100
90
1000
VS = 5V
RL = 620Ω
TA = +25℃
G=1
0.1
1
Load Capacitance (pF)
VS = 5.5V
VS = 2.5V to 5.5V
110
PSRR (dB)
CMRR (dB)
1000
120
VCM = -0.1V to 4V
100
90
VCM = -0.1V to 5.6V
100
90
80
70
60
100
PSRR vs. Temperature
130
110
80
10
Frequency (kHz)
CMRR vs. Temperature
120
1000
Channel Separation vs. Frequency
140
VS = 5V
RL = 10kΩ
TA = +25℃
G=1
60
100
Frequency (kHz)
Small-Signal Overshoot vs. Load Capacitance
70
10
-50 -30 -10
10
30
50
70
Temperature (℃)
SG Micro Corp
www.sg-micro.com
90
110 130
70
-50 -30 -10
10
30
50
70
90
110 130
Temperature (℃)
DECEMBER 2015
5
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VCM = VS/2, RL = 600Ω, unless otherwise noted.
Supply Current vs. Temperature
Output Voltage Swing vs. Output Current
5
600
500
450
VS = 2.5V
400
VS = 3V
350
VS = 5V
-50 -30 -10
10
30
+135℃
3
VS = 5V
2
50
70
0
90 110 130
Sinking Current
0
Open-Loop Gain vs. Temperature
10
20
Small-Signal Overshoot (%)
Open–Loop Gain (dB)
110
RL = 10kΩ
100
RL = 600Ω
80
10
30
50
70
50
10
1
10
Channel Separation (dB)
Output Voltage (V)
-50℃
Sinking Current
20
30
40
Output Current (mA)
SG Micro Corp
www.sg-micro.com
100
1000
Channel Separation vs. Frequency
1
10
80
-OS
20
140
2
0
70
Load Capacitance (pF)
VS = 3V
0
60
+OS
30
0
90 110 130
Sourcing Current
+25℃
50
40
Output Voltage Swing vs. Output Current
+135℃
40
VS = 2.7V
RL = 10kΩ
TA = +25℃
G=1
60
Temperature (℃)
3
30
Small-Signal Overshoot vs. Load Capacitance
70
-50 -30 -10
-50℃
Output Current (mA)
120
70
+25℃
+135℃
Temperature (℃)
90
-50℃
+25℃
1
300
250
Sourcing Current
4
550
Output Voltage (V)
Supply Current/Amplifier (μA)
650
50
60
VS = 2.7V
RL = 620Ω
TA = +25℃
G=1
130
120
110
100
90
0.1
1
10
100
1000
Frequency (kHz)
DECEMBER 2015
6
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VCM = VS/2, RL = 600Ω, unless otherwise noted.
Output Impedance vs. Frequency
140
VS = 2.7V
120
2.5
100
Output Voltage (VP-P)
Output Impedance (Ω)
Closed-Loop Output Voltage Swing
3
80
60
40
G = 100
G = 10
20
0
10
100
1000
1.5
1
0.5
G=1
1
2
0
10000
VS = 2.7V
VIN = 2.6VP-P
TA = +25℃
RL = 10kΩ
G=1
10
Large-Signal Step Response
Voltage (50mV/div)
Voltage (500mV/div)
VS = 2.7V
G = +1
CL = 100pF
RL = 10kΩ
Time (1μs/div)
Time (1μs/div)
Offset Voltage Production Distribution
Input Voltage Noise Density (nV/√Hz)
45
40
35
30
25
20
15
10
3
2
2.5
1.5
1
0.5
0
-1
-0.5
-2
-1.5
-3
-2.5
5
Offset Voltage (mV)
Input Voltage Noise Density vs. Frequency
1000
50
Percentage of Amplifiers (%)
10000
Small-Signal Step Response
VS = 2.7V
G = +1
CL = 100pF
RL = 10kΩ
SG Micro Corp
www.sg-micro.com
1000
Frequency (kHz)
Frequency (kHz)
0
100
VS = 5V
100
10
1
10
100
1000
10000
Frequency (Hz)
DECEMBER 2015
7
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
APPLICATION NOTES
Driving Capacitive Loads
The SGM8634 can directly drive 1000pF 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
the amplifier 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.
_
14
SGM8634
RISO
VOUT
+
VIN
CL
Power Supply Bypassing and Layout
The SGM8634 operates from either a single 2.5V to
5.5V supply or dual ±1.25V 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.
Good PC board layout techniques optimize performance
by decreasing the amount of stray capacitance at the
operational amplifier’s inputs and output. To decrease
stray capacitance, minimize trace lengths and widths
by placing external components as close to the device
as possible. Use surface-mount components whenever
possible.
For the operational amplifier, soldering the part to the
board directly is strongly recommended. Try to keep the
high frequency current loop area small to minimize the
EMI (electromagnetic interference).
+VS
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.
CF
_
14
SGM8634
VIN
+
10μF
10μF
0.1μF
0.1μF
VN
_
VN
14
SGM8634
VP
VOUT
_
14
SGM8634
VP
VOUT
+
+
10μF
0.1μF
-VS (GND)
RF
-VS
RISO
CL
+VS
VOUT
RL
Figure 3. Amplifier with Bypass Capacitors
Grounding
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 closed-loop gain or (b) by placing a
capacitor in parallel with the feedback resistor to
counteract the parasitic capacitance associated with
inverting node.
SG Micro Corp
www.sg-micro.com
A ground plane layer is important for SGM8634 circuit
design. The length of the current path in an inductive
ground return will create an unwanted voltage noise.
Broad ground plane areas will reduce the parasitic
inductance.
Input-to-Output Coupling
To minimize capacitive coupling, the input and output
signal traces should not be in parallel. This helps
reduce unwanted positive feedback.
DECEMBER 2015
8
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifier
SGM8634
TYPICAL APPLICATION CIRCUITS
Differential Amplifier
The circuit shown in Figure 4 performs the difference
function. If the resistor ratios are equal (R4/R3 = R2/R1),
then VOUT = (VP - VN) × R2/R1 + VREF.
R2
VN
R1
_
14
VOUT
SGM8634
VP
R3
Active Low-Pass Filter
The low-pass filter shown in Figure 6 has a DC gain of
(-R2/R1) and the -3dB corner frequency is 1/2πR2C.
Make sure the filter bandwidth is within the bandwidth
of the amplifier. Feedback resistors with large values
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.
+
C
R2
R4
R1
VIN
VREF
_
14
SGM8634
VOUT
+
Figure 4. Differential Amplifier
Instrumentation Amplifier
R3 = R1 // R2
The circuit in Figure 5 performs the same function as
that in Figure 4 but with a high input impedance.
Figure 6. Active Low-Pass Filter
_
R2
14
SGM8634
VN
R1
_
+
14
SGM8634
VOUT
+
VP
+
14
SGM8634
_
R3
R4
VREF
Figure 5. Instrumentation Amplifier
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DECEMBER 2015 ‒ REV.C.1 to REV.C.2
Page
New version....................................................................................................................................................................................................... All
February 2015 ‒ REV.C to REV.C.1
Page
Changed Package Outline Dimensions section ........................................................................................................................................... 17, 18
SG Micro Corp
www.sg-micro.com
DECEMBER 2015
9
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TSSOP-14
D
E
E1
5.94
1.78
e
b
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
1.200
0.047
A
A1
c
H
0.050
0.150
0.002
0.006
A2
0.800
1.050
0.031
0.041
b
0.190
0.300
0.007
0.012
c
0.090
0.200
0.004
0.008
D
4.860
5.100
0.191
0.201
E
4.300
4.500
0.169
0.177
E1
6.250
6.550
0.246
0.258
0.700
0.02
e
L
0.650 BSC
0.500
H
θ
SG Micro Corp
www.sg-micro.com
0.026 BSC
0.25 TYP
1°
0.028
0.01 TYP
7°
1°
7°
TX00019.001
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOIC-14
D
E
5.2
E1
2.2
e
b
0.6
1.27
RECOMMENDED LAND PATTERN (Unit: mm)
L1
R1
R
A3
A A2
h
L2
θ
A1
Symbol
h
L
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
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
L1
0.80
0.018
1.04 REF
L2
0.157
0.050 BSC
0.032
0.040 REF
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°
SG Micro Corp
www.sg-micro.com
TX00011.001
PACKAGE INFORMATION
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
A0
P1
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
Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
TSSOP-14
13″
12.4
6.95
5.60
1.20
4.0
8.0
2.0
12.0
Q1
SOIC-14
13″
16.4
6.60
9.30
2.10
4.0
8.0
2.0
16.0
Q1
SG Micro Corp
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TX10000.000
DD0001
Package Type
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)
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
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DD0002
Reel Type
TX20000.000
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