RS8521, RS8522
RS8523, RS8524
Zero-Drift, Rail-to-Rail I/O CMOS Operational
Amplifiers
Features
Description
Low Offset Voltage: 1uV
Input Offset Drift: 0.005μV/°C
High Gain Bandwidth Product: 350KHz
Rail-to-Rail Input and Output
High Gain, CMRR, PSRR:130dB
High Slew Rate: 0.17V/μs
Low Noise: 3.2uVp-p (0.01~10Hz)
Low Power Consumption: 60μA /op amp
Overload Recovery Time:6us
Low Supply Voltage: +2.5 V to +5.5 V
No External Capacitors Required
Extended Temperature: -40°C to +125°C
The RS8521,RS8522,RS8524,RS8523(dual version
&shutdown)series of CMOS operational amplifiers
use auto-zero techniques to simultaneously provide
very low offset voltage (5μV max) and near-zero drift
over time and temperature. This family of amplifiers
has ultralow noise, offset and power.
This miniature, high-precision operational amplifiers
offset high input impedance and rail-to-rail input and
rail-to-rail output swing. With high gain-bandwidth
product of 350KHz and slew rate of 0.17V/μs.
Single or dual supplies as low as +2.5V(±1.25V) and
up to +5.5V (±2.75V) may be used.
The RS8521/RS8522/RS8524/RS8523(dual version
with shutdown) are specified for the extended
industrial and automotive temperature range (-40°C
to 125°C). The RS8521 single amplifier is available
in 5-lead SOT23, 8-lead MSOP8 and 8-lead SOIC
packages, The RS8522 dual amplifier is available in
8-lead SOIC and 8-lead TSSOP narrow surface
mount packages, The RS8523(dual version with
shutdown) comes in Micro-SIZE MSOP-10. The
RS8524 quad is available in 14-lead SOIC and 14lead narrow TSSOP packages.
Applications
Temperature Sensors
Medical/Industrial Instrumentation
Pressure Sensors
Battery-Powered Instrumentation
Active Filtering
Weight Scale Sensor
Strain Gage Amplifiers
Power Converter/Inverter
REV B.4
1
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RS8521, RS8522
RS8523, RS8524
PIN CONFIGURATIONS
V-
2
+IN
3
5
+
-
4
NC
1
-IN
2
+IN
3
V-
4
8
NC
OUT A
1
7
V+
-IN A
2
+
1
-
OUT
RS8522
RS8521
RS8521
6
OUT
+IN A
3
5
NC
V-
4
V+
-IN
SOT23-5
+
A
B+
SOIC-8,MSOP-8
8
V+
7
OUTB
6
-IN B
5
+IN B
SOIC-8,MSOP-8
RS8524
OUT A
1
-IN A
2
-
+IN A
3
+
V-
4
En A
A
B
5
OUT A
1
10
V+
-IN A
2
9
OUT B
+IN A
-
8
-IN B
+
RS8523
7
+IN B
6
En B
MSOP-10
14
OUT D
13
-IN D
3
12
+IN D
V+
4
11
V-
+IN B
5
10
+IN C
9
-IN C
8
OUT C
-IN B
6
OUT B
7
A
- +
- +
B
D
+ -
+ C
SOIC-14,TSSOP-14
Note: NC indicates no internal connection
2
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RS8521, RS8522
RS8523, RS8524
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage, V+ to V-...............................................7.0V
(2)
Input Terminals, Voltage …………... – 0.5 to (V+) + 0.5V
(2)
Current …………………....…..... ±10mA
Storage Temperature ……….…………… −65°C to +150°C
Operating Temperature ……….………… −40°C to +125°C
Junction Temperature................................................150°C
Package Thermal Resistance @ TA = +25°C
SOT23-5, SOT23-6………………….………………200°C/W
MSOP-10, SOIC-8 …………………….…………... 150°C/W
SOIC-14, TSSOP-14………….……….……………100°C/W
Lead Temperature (Soldering, 10s) ……………........260°C
ESD Susceptibility
HBM …......................................................................5000V
MM ……………………….........………………...……….400V
ESD SENSITIVITY CAUTION
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.
(1) Stresses above these ratings may cause permanent damage. Exposure
to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those
specified is not implied.
(2) Input terminals are diode-clamped to the power-supply rails. Input
signals that can swing more than 0.5V beyond the supply rails should
be current-limited to 10mA or less.
PACKAGE/ORDERING INFORMATION
PRODUCT
ORDERING
NUMBER
TEMPRANGE
PACKAGE
PACKAGE
TRANSPORT
MARKING
MEDIA,QUANTITY
RS8521
RS8521XF
-400C~1250C
SOT23-5
8521
Reel,3000
RS8521
RS8521XK
-400C~1250C
SOIC-8
RS8521
Reel,2500
RS8521
RS8521XM
-400C~1250C
MSOP-8
RS8521
Reel,3000
RS8522
RS8522XK
-400C~1250C
SOIC-8
RS8522
Reel,2500
RS8522
RS8522XM
-400C~1250C
MSOP-8
RS8522
Reel,3000
RS8523
RS8523XN
-400C~1250C
MSOP-10
RS8523
Reel,3000
RS8524
RS8524XP
-400C~1250C
SOIC-14
RS8524
Reel,2500
RS8524
RS8524XQ
-400C~1250C
TSSOP-14
RS8524
Reel,3000
3
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RS8521, RS8522
RS8523, RS8524
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.
(At TA = +250C, Vs=5V, RL = 10kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted.)
PARAMETER
CONDITION
RS8521, RS8522,
RS8523, RS8524
MIN
TYP
MAX
UNIT
1
5
μV
0.005
0.05
μV/ C
OFFSET VOLTAGE
Input Offset Voltage
VS Temperature
VS Power Supply
Vos
VCM = Vs/2
dVos/dT
PSRR
VS = +2.5V to +5.5V, VCM = 0
110
Channel Separation, dc
0
130
dB
0.1
μV/V
10
pA
10
pA
INPUT BIAS CURRENT
Input Bias Current
IB
Input Offset Current
Ios
VCM = Vs/2
NOISE PERFORMANCE
Input Voltage Noise
enp-p
f=0.01Hz to 10Hz
3.2
μVpp
Input Voltage Noise
enp-p
f=0.01Hz to 1Hz
0.97
μVpp
Input Voltage Noise Density
en
f=1KHz
140
nV/√Hz
Input Current Noise Density
in
f=10Hz
15
fA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
VCM
(V-)-0.1
Common-Mode Rejection Ratio CMRR
(V–) – 0.1V < VCM < (V+)+ 0.1V
110
(V+)+0.1
V
130
dB
Differential
1
pF
Common-Mode
5
pF
130
dB
0.17
V/μs
350
KHz
6
us
INPUT CAPACITANCE
OPEN-LOOP GAIN
Open-Loop Voltage Gain
AOL
RL=10KΩ, VO=0.3V to 4.7V, -40°C~125°C
SR
G=+1
110
DYNAMIC PERFORMANCE
Slew Rate
Gain-Bandwidth Product
GBW
Overload Recovery Time
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
VOH
VOL
RL=100 KΩ to GND
4.99
4.998
V
RL=10 KΩ to GND
4.95
4.98
V
RL=100 KΩ to V+
1
10
mV
RL=10 KΩ to V+
10
30
mV
ISC
25
mA
POWER SUOOLY
Operating Voltage Range
Quiescent Current/ Amplifier
2.5
IQ
60
5.5
V
87
uA
SHUTDOWN
tOFF
2
μs
tON
1
ms
VL (shutdown)
VH (amplifier is active)
0
+0.8
V
0.75(V+)
V+
V
Input Bias Current of Enable Pin
50
IQSD
1
4
pA
5
uA
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RS8521, RS8522
RS8523, RS8524
TYPICAL CHARACTERISTICS
At TA = +25C, Vs=5V, RL = 10kΩconnected to VS/2, VOUT = VS/2, unless otherwise noted.
OFFSET VOLTAGE PRODUCTION
DISTRIBUTION
Population
Number Of Amplifiers
6
OFFSET VOLTAGE DRIFT PRODUCTION
DISTRIBUTION
5
4
3
2
1
0
-4
-3
-2
-1
0
1
2
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
3
Offset Voltage (uV)
Input Offset Drift (nV/℃)
INPUT BIAS CURRENT vs TEMPERATURE
OPEN−LOOP GAIN AND PHASE vs FREQUENCY
100
10K
130
Phase
110
60
90
40
70
20
50
0
30
-20
Input Bias Current(pA)
80
Phase Margin (°)
Open-Loop Gain(dB)
Gain
10
10
100
1K
10K
100K
1K
100
10
1M
-40 -20
0
POWER−SUPPLY REJECTION RATIO vs
FREQUENCY
140
120
120
100
100
CMRR(dB)
PSRR(dB)
140
20
40
60
80 100 120 140
Temperature(℃)
Frequency(Hz)
80
60
COMMON−MODE REJECTION RATIO vs
FREQUENCY
80
60
40
40
20
20
0
0
100
1K
10K
100K
Frequency(Hz)
1M
100
10M
5
1K
10K
100K
Frequency(Hz)
1M
10M
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RS8521, RS8522
RS8523, RS8524
TYPICAL CHARACTERISTICS
At TA = +25C, Vs=5V, RL = 10kΩconnected to VS/2, VOUT = VS/2, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
59
56
58
55
Quiescent Current(uA)
Quiescent Current(uA)
QUIESCENT CURRENT vs TEMPERATURE
57
56
55
54
53
54
53
52
51
50
-40 -20
0
20 40 60 80 100 120 140
Temperature(℃) Vs=5V
-40 -20
35
35
Source Current(mA)
40
30
25
20
30
25
20
15
15
10
10
-40 -20
0
20 40 60 80 100 120 140
Temperature(℃) Vs=2.7V
SOURCE CURRENT vs TEMPERATURE
40
-40 -20
20 40 60 80 100 120 140
Temperature(℃)
0
20 40 60 80 100 120 140
Temperature(℃)
SMALL−SIGNAL STEP RESPONSE
LARGE−SIGNAL STEP RESPONSE
CL=100PF
CL=100PF
1V/div
50mV/div
Sink Current(mA)
SINK CURRENT vs TEMPERATURE
0
2us/div
10us/div
6
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RS8521, RS8522
RS8523, RS8524
TYPICAL CHARACTERISTICS
At TA = +25C, Vs=5V, RL = 10kΩconnected to VS/2, VOUT = VS/2, unless otherwise noted.
POSITIVE OVERVOLTAGE RECOVERY
0V
0V
Vs=±2.5V
G=-100
VOUT
Vs=±2.5V
5us/div
5us/div
0.01Hz TO 10Hz NOISE AT Vs=2.7V
1uV/div
2uV/div
0.01Hz TO 10Hz NOISE AT Vs=5V
10s/div
10s/div
0.01Hz TO 1Hz NOISE AT Vs=2.7V
500nV/div
0.01Hz TO 1Hz NOISE AT Vs=5V
500nV/div
0V
1V/div
VOUT
200mV/div
VIN
1V/div
200mV/div
0V
VIN
NEGATIVE OVERVOLTAGE RECOVERY
10s/div
10s/div
7
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RS8521, RS8522
RS8523, RS8524
75% of the total supply voltage. The valid logic high
signal can be up to 5.5V above the negative supply,
independent of the positive supply voltage. A valid
logic low is defined as < 0.8V above the V– supply
pin. If dual or split power supplies are used, be sure
that logic input signals are properly referred to the
negative supply voltage. The Enable pin must be
connected to a valid high or low voltage, or driven,
not left open circuit.
The logic input is a high-impedance CMOS input,
with separate logic inputs provided on the dual
version. For batteryoperated applications, this
feature can be used to greatly reduce the average
current and extend battery life.
APPLICATION NOTES
The RS8521, RS8522, RS8523, RS8524 series op
amps are unity-gain stable and free from
unexpected output phase reversal. They use autozeroing techniques to provide low offset voltage and
very low drift over time and temperature.
Good layout practice mandates use of a 0.1µF
capacitor placed closely across the supply pins.
For lowest offset voltage and precision performance,
circuit layout and mechanical conditions should be
optimized. Avoid temperature gradients that create
thermoelectric (Seebeck) effects in thermocouple
junctions formed from connecting dissimilar
conductors. These thermally-generated potentials
can be made to cancel by assuring that they are
equal on both input terminals.
The enable time includes one full autozero cycle
required by the amplifier to return to VOS accuracy.
Prior to this time, the amplifier functions properly,
but with unspecified offset voltage.
• Use low thermoelectric-coefficient connections
(avoid dissimilar metals).
• Thermally isolate components
supplies or other heat-sources.
from
Disable time is 1µs. When disabled, the output
assumes a high-impedance state. This allows the
RS8523 to be operated as a gated amplifier, or to
have the output multiplexed onto a common analog
output bus.
power
• Shield op amp and input circuitry from air
currents, such as cooling fans.
Following these guidelines will reduce the likelihood
of junctions being at different temperatures, which
can cause thermoelectric voltages of 0.1µV/°C or
higher, depending on materials used.
LAYOUT GUIDELINES
Attention to good layout practices is always
recommended. Keep traces short. When possible,
use a 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.
OPERATING VOLTAGE
The RS8521, RS8522, RS8523, RS8524 series op
amps operate over a power-supply range of +2.5V
to +5.5V (±1.25V to ±2.75V). Supply voltages higher
than 7V (absolute maximum) can permanently
damage the amplifier. Parameters that vary over
supply voltage or temperature are shown in the
Typical Characteristics section of this data sheet.
RS8523 ENABLE FUNCTION
The enable/shutdown digital input is referenced to
the V– supply voltage of the amp. A logic high
enables the op amp. A valid logic high is defined as >
Figure 1. The Layout of Guard Ring
8
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RS8521, RS8522
RS8523, RS8524
PACKAGE OUTLINE DIMENSIONS
SOT23-5
D
1.90
b
2.59
E1
E
0.99
0.69
0.95
e
e1
RECOMMENDED LAND PATTERN (Unit: mm)
0.2
A A2
L
A1
Symbol
c
θ
Dimensions In Millimeters
Dimensions In Inches
Min
Max
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)
0.037(BSC)
e1
1.800
2.000
0.071
0.079
L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
9
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RS8521, RS8522
RS8523, RS8524
MSOP-8
b
e
E
E1
4.8
1.02
D
0.65
0.41
RECOMMENDED LAND PATTERN (Unit: mm)
A2
c
A
A1
L
Symbol
Dimensions In Millimeters
θ
Dimensions In Inches
Min
Max
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
0.650(BSC)
0.026(BSC)
E
2.900
3.100
0.114
0.122
E1
4.750
5.050
0.187
0.199
L
0.400
0.800
0.016
0.031
θ
0°
6°
0°
6°
10
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RS8521, RS8522
RS8523, RS8524
MSOP-10
b
e
E
4.65
E1
1.02
0.31
D
0.5
RECOMMENDED LAND PATTERN (Unit: mm)
A2
A1
Symbol
A
c
L
Dimensions In Millimeters
θ
Dimensions In Inches
Min
Max
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
0.180
0.280
0.007
0.011
c
0.090
0.230
0.004
0.009
D
2.900
3.100
0.114
0.122
e
0.50(BSC)
0.020(BSC)
E
2.900
3.100
0.114
0.122
E1
4.750
5.050
0.187
0.199
L
0.400
0.800
0.016
0.031
θ
0°
6°
0°
6°
11
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RS8521, RS8522
RS8523, RS8524
TSSOP-14
e
b
5.6
E1 E
1.78
D
0.65
0.42
RECOMMENDED LAND PATTERN (Unit: mm)
A2
A1
Symbol
H
C
A
θ
L
Dimensions In Millimeters
Min
Max
A
Dimensions In Inches
Min
Max
1.200
0.047
A1
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
e
L
0.650(BSC)
0.500
H
θ
0.026(BSC)
0.700
0.020
0.25(TYP)
1°
0.028
0.01(TYP)
7°
12
1°
7°
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RS8521, RS8522
RS8523, RS8524
SOIC-8
b
e
5.2
E
E1
2.2
D
1.27
0.6
RECOMMENDED LAND PATTERN (Unit: mm)
A2
c
A
A1
L
Symbol
Dimensions In Millimeters
θ
Dimensions In Inches
Min
Max
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
0.007
0.010
D
4.800
5.000
0.189
0.197
e
1.270(BSC)
0.050(BSC)
E
5.800
6.200
0.228
0.244
E1
3.800
4.000
0.150
0.157
L
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
13
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RS8521, RS8522
RS8523, RS8524
SOIC-14
e
b
5.2
1.27
E E1
0.6
D
1.27
RECOMMENDED LAND PATTERN (Unit: mm)
A2
A1
c
A
θ
L
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
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
0.310
0.510
0.012
0.020
c
0.100
0.250
0.004
0.010
D
8.450
8.850
0.333
0.348
e
1.270(BSC)
0.050(BSC)
E
5.800
6.200
0.228
0.244
E1
3.800
4.000
0.150
0.157
L
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
14
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