Overview
The OPA2835IRUNT, produced by Texas Instruments, is a dual ultra-low-power, rail-to-rail output, negative-rail input, voltage-feedback operational amplifier. This device is designed to operate over a wide power supply range of 2.5 V to 5.5 V with a single supply, or ±1.25 V to ±2.75 V with a dual supply. It is particularly suited for battery-powered, portable applications where low power consumption and high-frequency performance are critical.
The OPA2835IRUNT consumes only 250 µA per channel and offers a unity gain bandwidth of 56 MHz, setting an industry-leading performance-to-power ratio for rail-to-rail amplifiers. The device also features a power-savings mode that reduces the current to less than 1.5 µA, making it an attractive solution for high-frequency amplifiers in battery-powered systems.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | 2.5 | 5.5 | V | ||
| Quiescent Operating Current per Amplifier | TA = 25°C | 175 | 250 | 300 | µA |
| Power Down Quiescent Current | PD = 0.5 V | 0.5 | 1.5 | µA | |
| Unity Gain Bandwidth | 56 | MHz | |||
| Input Voltage Range | 5-V Supply | -0.2 | 3.9 | V | |
| Operating Temperature Range | -40 | 125 | °C | ||
| Open-Loop Voltage Gain (AOL) | 100 | 120 | dB | ||
| Common-Mode Rejection Ratio | 88 | 110 | dB | ||
| Output Current Drive | TA = 25°C, G = 5 | ±25 | ±35 | mA |
Key Features
- Ultra-Low Power Consumption: Quiescent current of 250 µA per channel and a power-down mode reducing current to less than 1.5 µA.
- Rail-to-Rail Output: Output voltage range extends to the supply rails.
- High-Frequency Performance: Unity gain bandwidth of 56 MHz.
- Gain-Setting Resistors: Integrated gain-setting resistors in the OPA835IRUN package option for various gain settings.
- Extended Industrial Temperature Range: Operates from –40°C to +125°C.
- Low Input Voltage Noise: Input voltage noise of 9.3 nV/√Hz at 100 kHz.
- High Common-Mode Rejection Ratio: Minimum CMRR of 88 dB.
Applications
- Low-Power Signal Conditioning: Ideal for applications requiring low power consumption and high signal integrity.
- Audio ADC Input Buffer: Suitable for audio applications where low noise and high bandwidth are necessary.
- Low-Power SAR and ΔΣ ADC Driver: Used in analog-to-digital converter systems where low power and high performance are required.
- Portable Systems: Battery-powered devices such as handheld instruments and portable medical equipment.
- Low-Power Systems: General low-power applications where minimizing power consumption is critical.
- High-Density Systems: Compact systems requiring minimal footprint, such as those using QFN or UQFN packages.
- Ultrasonic Flow Meter: Applications involving precise signal conditioning for ultrasonic measurements.
Q & A
- What is the typical quiescent current per channel for the OPA2835IRUNT?
The typical quiescent current per channel is 250 µA.
- What is the operating temperature range for the OPA2835IRUNT?
The operating temperature range is from –40°C to +125°C.
- What is the unity gain bandwidth of the OPA2835IRUNT?
The unity gain bandwidth is 56 MHz.
- Does the OPA2835IRUNT have integrated gain-setting resistors?
Yes, the OPA835IRUN package option includes integrated gain-setting resistors for various gain settings.
- What is the common-mode rejection ratio (CMRR) of the OPA2835IRUNT?
The minimum CMRR is 88 dB.
- What is the input voltage noise of the OPA2835IRUNT at 100 kHz?
The input voltage noise is 9.3 nV/√Hz at 100 kHz.
- Can the OPA2835IRUNT be used in high-density systems?
Yes, it is suitable for high-density systems due to its compact package options such as QFN and UQFN.
- What are some typical applications for the OPA2835IRUNT?
Typical applications include low-power signal conditioning, audio ADC input buffers, low-power SAR and ΔΣ ADC drivers, portable systems, and ultrasonic flow meters.
- How does the power-down mode affect the quiescent current of the OPA2835IRUNT?
In power-down mode, the quiescent current is reduced to less than 1.5 µA.
- What is the output current drive capability of the OPA2835IRUNT at 25°C?
The output current drive capability is ±25 mA at 25°C with a gain of 5.
