Dual voltage-feedback amplifier for high-speed signal chains
The OPA2890ID is a dual-channel voltage-feedback operational amplifier from Texas Instruments, designed for applications requiring wide bandwidth and fast slew rate with moderate power consumption. Each channel delivers a 400 V/µs slew rate and a 250 MHz -3dB bandwidth, making it suited for video distribution, ADC drivers, and high-speed data acquisition front-ends where signal edge integrity matters.
Slew rate and bandwidth: what they mean for the signal path
A 400 V/µs slew rate means the output can swing 4 V in 10 ns — fast enough to reproduce a 10 MHz full-scale sine wave with less than 1% distortion, but the actual large-signal bandwidth is set by the slew rate limit, not the small-signal -3dB point. The 250 MHz -3dB bandwidth and 120 MHz gain-bandwidth product together define the usable frequency range: at a closed-loop gain of 10, the bandwidth drops to roughly 12 MHz, so the designer must budget the gain-bandwidth trade-off when setting the feedback network.
Power budget and thermal envelope
Each channel draws 2.25 mA from a supply rail spanning 3 V to 12 V, so the total quiescent current for both amplifiers is 4.5 mA — at 5 V that is 22.5 mW quiescent, leaving headroom in the thermal budget for the 40 mA output drive per channel. The -40°C to +85°C operating range covers industrial enclosures and outdoor telecom cabinets without forced cooling, though the input offset voltage (2 mV max) and input bias current (100 nA) should be derated at the temperature extremes per the datasheet typical-performance curves.
Package, lifecycle, and sourcing posture
Housed in an 8-pin SOIC package (0.154-inch body width), the OPA2890ID is a surface-mount part that shares the standard SOIC-8 footprint — no board spin needed if replacing a similar dual op-amp in the same package.