Overview
The OPA991IDCKR, part of the OPAx991 family from Texas Instruments, is a high-voltage general-purpose operational amplifier. This device is designed for high-voltage industrial applications, offering exceptional DC precision and AC performance. It features rail-to-rail input and output, low offset voltage, low noise, and a wide bandwidth of 4.5 MHz. The OPA991 is available in various micro-size and standard packages, including the SOT-SC70 package, and is specified to operate from –40°C to 125°C.
Key Specifications
| Specification | Value |
|---|---|
| Offset Voltage | ±125 µV (typical) |
| Offset Voltage Drift | ±0.3 µV/°C (typical) |
| Noise | 10.8 nV/√Hz at 1 kHz |
| Common-Mode Rejection | 130 dB |
| Bias Current | ±10 pA |
| Bandwidth | 4.5 MHz GBW |
| Slew Rate | 21 V/µs |
| Capacitive Load Drive | 1 nF |
| Output Current | ±75 mA |
| Quiescent Current | 560 µA per amplifier |
| Supply Voltage | ±1.35 V to ±20 V, 2.7 V to 40 V |
| Operating Temperature Range | –40°C to 125°C |
| Package | SOT-SC70 (5 pins) |
Key Features
- Low offset voltage: ±125 µV
- Low offset voltage drift: ±0.3 µV/°C
- Low noise: 10.8 nV/√Hz at 1 kHz
- High common-mode rejection: 130 dB
- Low bias current: ±10 pA
- Rail-to-rail input and output
- Wide bandwidth: 4.5 MHz GBW
- High slew rate: 21 V/µs
- High capacitive load drive: 1 nF
- MUX-friendly/comparator inputs
- Amplifier operates with differential inputs up to supply rail
- Amplifier can be used in open-loop or as comparator
- Low quiescent current: 560 µA per amplifier
- Wide supply voltage range: ±1.35 V to ±20 V, 2.7 V to 40 V
- Robust EMIRR performance: EMI/RFI filters on input and supply pins
- Differential and common-mode input voltage range to supply rail
- Shutdown functionality
Applications
- Low-power audio preamplifier
- Multiplexed data-acquisition systems
- Test and measurement equipment
- ADC driver amplifiers
- SAR ADC reference buffers
- Programmable logic controllers
- High-side and low-side current sensing
Q & A
- What is the typical offset voltage of the OPA991?
The typical offset voltage of the OPA991 is ±125 µV.
- What is the bandwidth of the OPA991?
The bandwidth of the OPA991 is 4.5 MHz GBW.
- What is the slew rate of the OPA991?
The slew rate of the OPA991 is 21 V/µs.
- What is the maximum output current of the OPA991?
The maximum output current of the OPA991 is ±75 mA.
- What is the operating temperature range of the OPA991?
The operating temperature range of the OPA991 is –40°C to 125°C.
- Can the OPA991 be used as a comparator?
Yes, the OPA991 can be used in open-loop or as a comparator.
- What is the quiescent current of the OPA991?
The quiescent current of the OPA991 is 560 µA per amplifier.
- What is the supply voltage range of the OPA991?
The supply voltage range of the OPA991 is ±1.35 V to ±20 V, 2.7 V to 40 V.
- Does the OPA991 have shutdown functionality?
Yes, the OPA991 has shutdown functionality.
- What are some common applications of the OPA991?
The OPA991 is commonly used in low-power audio preamplifiers, multiplexed data-acquisition systems, test and measurement equipment, ADC driver amplifiers, SAR ADC reference buffers, programmable logic controllers, and high-side and low-side current sensing.
