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OPA991 Scheda tecnica(PDF) 30 Page - Texas Instruments

Il numero della parte OPA991
Spiegazioni elettronici  OPAx991 40-V Rail-to-Rail Input/Output, Low Offset Voltage, Low Noise Op Amp
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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OPA991 Scheda tecnica(HTML) 30 Page - Texas Instruments

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OPA991, OPA2991, OPA4991
SBOS969B – OCTOBER 2019 – REVISED MAY 2020
www.ti.com
Product Folder Links: OPA991 OPA2991 OPA4991
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Specifications with a value in the minimum or maximum column are assured by TI, and units outside these limits
will be removed from production material. For example, the OPAx991 family has a maximum offset voltage of
675 µV at 25°C, and even though this corresponds to about 5 σ (≈1 in 1.7 million units), which is extremely
unlikely, TI assures that any unit with larger offset than 675 µV will be removed from production material.
For specifications with no value in the minimum or maximum column, consider selecting a sigma value of
sufficient guardband for your application, and design worst-case conditions using this value. For example, the 6σ
value corresponds to about 1 in 500 million units, which is an extremely unlikely chance, and could be an option
as a wide guardband to design a system around. In this case, the OPAx991 family does not have a maximum or
minimum for offset voltage drift, but based on Figure 2 and the typical value of 0.3 µV/°C in the Electrical
Characteristics table, it can be calculated that the 6-σ value for offset voltage drift is about 1.8 µV/°C. When
designing for worst-case system conditions, this value can be used to estimate the worst possible offset across
temperature without having an actual minimum or maximum value.
However, process variation and adjustments over time can shift typical means and standard deviations, and
unless there is a value in the minimum or maximum specification column, TI cannot assure the performance of a
device. This information should be used only to estimate the performance of a device.
7.3.10 Packages With an Exposed Thermal Pad
The OPAx991 family is available in packages such as the WSON-8 (DSG) and WQFN-16 (RTE) which feature
an exposed thermal pad. Inside the package, the die is attached to this thermal pad using an electrically
conductive compound. For this reason, when using a package with an exposed thermal pad, the thermal pad
must either be connected to V– or left floating. Attaching the thermal pad to a potential other than V– is not
allowed, and performance of the device is not assured when doing so.
7.3.11 Shutdown
The OPAx991S devices feature one or more shutdown pins (SHDN) that disable the op amp, placing it into a
low-power standby mode. In this mode, the op amp typically consumes about 20 µA. The SHDN pins are active
high, meaning that shutdown mode is enabled when the input to the SHDN pin is a valid logic high.
The SHDN pins are referenced to the negative supply rail of the op amp. The threshold of the shutdown feature
lies around 800 mV (typical) and does not change with respect to the supply voltage. Hysteresis has been
included in the switching threshold to ensure smooth switching characteristics. To ensure optimal shutdown
behavior, the SHDN pins should be driven with valid logic signals. A valid logic low is defined as a voltage
between V– and V– + 0.4 V. A valid logic high is defined as a voltage between V– + 1.2 V and V– + 20 V. The
shutdown pin circuitry includes a pull-down resistor, which will inherently pull the voltage of the pin to the
negative supply rail if not driven. Thus, to enable the amplifier, the SHDN pins should either be left floating or
driven to a valid logic low. To disable the amplifier, the SHDN pins must be driven to a valid logic high. The
maximum voltage allowed at the SHDN pins is V– + 20 V. Exceeding this voltage level will damage the device.
The SHDN pins are high-impedance CMOS inputs. Channels of single and dual op amp packages are
independently controlled, and channels of quad op amp packages are controlled in pairs. For battery-operated
applications, this feature may be used to greatly reduce the average current and extend battery life. The typical
enable time out of shutdown is 30 µs; disable time is 3 µs. When disabled, the output assumes a high-
impedance state. This architecture allows the OPAx991S family to operate as a gated amplifier, multiplexer, or
programmable-gain amplifier. Shutdown time (tOFF) depends on loading conditions and increases as load
resistance increases. To ensure shutdown (disable) within a specific shutdown time, the specified 10-kΩ load to
midsupply (VS / 2) is required. If using the OPAx991S without a load, the resulting turnoff time significantly
increases.


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