Input-overvoltage-protected, low-power, low-noise four-channel op amp with super-beta inputs

The OPA206, OPA2206, and OPA4206 ( OPAx206) are the next generation of the industry-standard OPAx277

family with the added feature of input overvoltage protection. These precision, bipolar,

e‑trim ™ op amps with super-beta inputs use TI’s proprietary trimming technology

to achieve an input offset voltage of ±4 µV (typical) and an input offset voltage drift of

±0.08 µV/°C (typical). The input overvoltage protection activates when the input signal

exceeds the supply range and protects up to 40 V beyond either supply. This feature

eliminates the need for external circuitry to prevent amplifier damage, thereby reducing

size and costs.

The OPAx206

provide a speed-to-power ratio of 3.6 MHz for a mere 220 µA (typical). These devices also

achieve a low voltage noise density of only 8 nV/√ Hz at 1 kHz. The

super-beta inputs of the OPAx206 have a very low input bias

current of 100 pA (typical) and a current noise density of

110 fA/√ Hz.

The high performance of the OPAx206 make these devices an excellent choice for systems

requiring high precision and low power consumption, such as high-density analog input

modules in programmable logic controllers, field and portable instrumentation systems, and

source measurement units. The OPA205 and OPA2205 are related

devices with the same op amp core without the input protection, but with improved broadband

noise (7.2 nV/√ Hz).