STMicroelectronics Operational Amplifiers Quick reference guide
GLOSSARY
Supply voltage (VCC) – Voltage difference between the two power pins where the op amp works correctly. In ST’s portfolio,
one can nd 5V, 16V and 36V products.
Quiescent current / Supply current (ICC) – Supply current needed for each operational amplier in the package for its
operation.
Input offset voltage (VIO) – Differential input voltage of the + and - pins to get the output at the mid-range of the supply
voltage. It originates from the matching of internal transistors.
Input bias current (IIB) – Current owing through an op amp’s inputs. Due to op amp biasing requirements and normal
operation leakage, a very small amount of current (pA or nA range, depending on the technology) is owing through its inputs.
This may cause problems when large value resistors or sources with higher output impedances are connected at the op amp
inputs. This causes relevant voltage drops at the op amp input and therefore errors.
Gain bandwidth product (GBP or GBW) – Product of an op amp’s gain and bandwidth. It is measured at 20 dB gain. Dened
for small signals.
Slew rate (SR) – How fast an op amp can change voltage on its output. An op amp’s output rate of change is limited to the
slew rate value. It causes distortion if the signal to be amplied is too fast.
Rail-to-rail input – An op amp with a high rail input is able to deal with input signals up to Vcc+ while a low rail input is able to
deal with signals down to Vcc-. Rail-to-rail input op amps can handle input signals from Vcc- to Vcc+.
Rail-to-rail output – Capability of an op amp to drive its output very close to the power supply rails.
Noise level – Op-amps generate random voltages at the output even when there is no signal applied on its input. Such noise
comes from the thermal noise (white noise) or 1/f noise, also called icker noise. For applications with high gain or bandwidth,
a noise level may become considerable.
Capacitive load – Can cause an op amp to become an oscillator. The op amp output resistance in connection with a capacitive
load results in an additional pole in the circuit transfer function. From the Bode, then it is clearly visible under which operating
conditions the circuit can become unstable.
Zero drift – Chopper op amps designed to “self-correct” their VIO errors and also those happening over temperature and over
the time. Thanks to their design, zero-drift op amps have their VIO in the range of microvolts and similarly “nano-volt” per
Celsius degree drift. Zero-drift op amps have virtually no 1/f noise and also their “aging” over the time is negligible.
Shut down – Op amp operation switch-off. Usually used to reduce the circuit standby current when an application does not
run or amplication is not needed. Usually controlled by a dedicated op amp pin.
EMI hardening – An op amp’s input pins are very sensitive and might act as a gate for electromagnetic interference in your
design. Some op amps embed EMI lters to attenuate high-frequency signals for 60 dB or more.
Strain gauge – A sensor used to measure an object’s deformation.
RTD sensor – Resistance temperature detectors. Many RTD sensors are constructed from a ne metal wire which is wrapped
around a ceramic/glass carry core.
Thermocouple – Every transition between different kinds of metals causes a tiny thermoelectrical voltage. This effect is used in
some temperature sensors.
Operational Amplifiers
(Op Amps)
Quick reference guide
For more information, visit us on www.st.com/opamps
5
Order code: BROPAMPQR0421
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In today’s digital world, many signals start
as an analog one. Many sensors already
have their own analog signal conditioning
circuit, but an operational amplifier is
still a key device when you need more
complex amplification and filtering, or just
for interfacing analog signals with an ADC
or a microcontroller. This reference guide
provides you information about ST’s most
recent operational amplifiers and their
characteristics.
HOW DO I PICK THE RIGHT OP AMP FOR AN APPLICATION ?
Even though some may consider op amps as a commodity, they are not. Modern high-performance devices have a wide range
of variable parameters. One device can have almost ideal parameters, while another may be little worse and others can be
completely different. The main key performance indicators for operational ampliers can be listed as following:
Supply voltage (V) Quiescent current (µA) Input offset voltage (mV) Input bias current (pA)
Gain bandwidth product (MHz) Slew rate (V/µs) Rail-to-rail input and output Noise level (nV/VHz)
Other signal conditioning
More complex signal conditioning circuits have different requirements and designers should keep in mind all the abovementioned parameters and how they each affect functionality and performance.
OP AMP LONGEVITY COMMITMENT
Most of ST’s newly developed high-performance op amps come with our 10-year longevity commitment.
The list gets longer every year.
STEP-BY-STEP OP AMP SELECTION USING THE ST OP AMPS APP
Look at our
What is the
application ?
www.st.com/opamps-app
Small voltage e.g
current sensing
Small current e.g
photodiode
Other signal
conditioning
Is it current sensing?
Operating voltage level?
What precision voltage (VIO) is
needed? What is the gain bandwidth (GBP)? (optional: power
consumption and rail-to-rail)
Operating voltage level?
What input bias (IIB) is needed?
What slew rate is required?
(optional: power consumption and
rail-to-rail)
TSC series of
current-sense
ampliers
Too many choices?
Add more search lters
No choices?
Remove some search lters
Use product
selector
BW
50 MHz
22 MHz
20 MHz
16 MHz
10 MHz
9 MHz
8 MHz
6 MHz
3 MHz
2.7 MHz
2.5 MHz
2.4 MHz
1.3 MHz
1.1 MHz
TSV791*/792
TSB7191/7192/7194*
TSV7721*/7722/7723*
TSV991/992/994
TSV911/912/914
TSZ181/182
TSV6390/6391/6392/6393/6394/6395
TSV6290/6291/6292/6293/6294
TSV521/522/524
>
TSX7191/7192
Z
TSX711/712
>
>
TSX9291/9292
TSX920/921/922/923
TSB711/712/714*
>
>
TSB571/572
>
TYPICAL OP AMP APPLICATIONS AND KEY PARAMETERS
Each application has different key requirements for operational amplier performance. Generally, we can divide applications
into several different categories.
Amplification of low voltage signals
When amplifying low-voltage signals, you denitely need high precision op amps since the input offset voltage directly affects
your measurement. On the other hand, most low-voltage signals come from low-impedance sources; therefore, the input bias
current is not critical. A differential amplier or an instrumentation amplier is a typical circuit. Current sensing is a typical
application where you usually need low- or high-rail features and possibly an appropriate bandwidth with a slew rate to track
PWM. Other applications include Wheatstone bridges circuits e.g. strain gauges, RTD sensors or resistive sensors. In such
applications, rail-to-rail inputs are not needed in most cases, but you may require a low-noise device. The same can be applied
to thermocouples.
Small current amplification
Sensors providing a small current will require an op amp with a low input bias current. All of these applications use a
transimpedance amplier where the input offset voltage is not usually critical.
A typical application is a photodiode current sensing circuit used in communications, light curtains, smoke detectors,
electrochemical gas sensors or optical heart rate monitors. In this case, the device is quite often powered from a battery so
power consumption can be important or the device needs to be fast and a high slew rate may be required.
ADC buffering
Interfacing an analog signal with an ADC can be tricky since the ADC requires a high current within a short time to charge
input capacitors. Often an additional capacitor is used at the op amp output which may cause stability issues and may require
the use of compensation techniques. In any case, errors caused by an op amp should be less than one LSB of the ADC.
Additionally, an op amp can be used as a basic anti-aliasing lter.
2
PSPICE models available
Simulate the selected op amp
in your circuit
Operating voltage level? Precision
voltage and current (VIO and IB)?
Speed (GBP)? Rail-to-rail input and
output?
DON’T GET LOST IN ST’S OP AMP NAMING CONVENTION
TSV 7 7 2 2 A I Y S T
Series root name
TSV High performance 5V
TSU Nano power 5V
TSZ Zero drift 5V
TSX High performance 16V
TSB High performance 36V
LM Standard amplifiers
Series root number
1 Family specific
5 High merit factor
6 Micro power
7 High precision
9 High speed
ICC and Speed
Higher value means higher
power consumption and
faster
Compensation
Standard device
None
(unity gain stable)
Higher GBW
9
(stable for gain >5)
Any Specific to family
#opamps in package
1 Single
2 Dual
4 Quad
With shutdown
0 Single
3 Dual
5 Quad
Precision
None Standard device
A Enhanced Vio
Temperature range
I
H
Grade
None Standard qualification
Y Automotive grade
Industrial temperature
range -40 to 125 ºC
High temperature
range -40 to 150 ºC
Package
C SC70
D SO
L SOT23
P TSSOP
Q DFN/QFN
S Mini SO
Tape and reel
900 kHz
880 kHz
560 kHz
450 kHz
420 kHz
400 kHz
200 kHz
150 kHz
120 kHz
11 kHz
8 kHz
Legend:
TSU101/102/104
1.5 V 2 V 2.5 V 2.7 V1.8 V 3 V
High precision
Zero drift
Z
>
TSV731/732/734
TSX561/562/564
TSV630/631/632/633/634/635
TSB611/612*
TSV6191/6192
TSV620/621/622/623/624/625
TSZ121/122/124
TSV711/712/714
TSV611/612
TSU111/112/114
3.3 V
4 V
>
Z
TSX631/632/634
Z
5 V 10 V 12 V 30 V 36 V
6 V5.5 V 16 V
General purpose
Uncompensated Automotive
Low power
* Under development
V
cc
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