SBOSAA5B April 2022 – September 2022 OPA2675
The OPA2675 gives exceptional ac performance with a highly linear, high-power output stage. Requiring 16-mA/ch quiescent current, the OPA2675 swings to within 1.1 V of either supply rail and delivers in excess of 850 mA at room temperature. This low output headroom requirement, along with supply voltage independent biasing, gives remarkable dual (±6 V) supply operation. The OPA2675 delivers greater than 450 MHz bandwidth driving a 2 VPP output into 100 Ω on a single +12 V supply.
The primary advantage of a current-feedback op amp over a voltage-feedback op amp is that ac performance (bandwidth and distortion) is relatively independent of signal gain. Figure 8-1 shows the dc-coupled, gain of +4 V/V, dual power-supply circuit configuration used as the test circuit for the ±6 V Electrical Characteristics and Typical Characteristics. Voltage swings reported in the Electrical Characteristics are taken directly at the input and output pins. For measuring the ac performance, the output of the OPA2675 is terminated with a matched 50 Ω loading. Thus, the total effective load seen by the OPA2675 is 100 Ω || 402 Ω = 80 Ω.