OPA2604 Datasheet, PDF (13/26 Pages) Burr-Brown (TI) – Dual FET-Input, Low Distortion OPERATIONAL AMPLIFIER

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OPA2604
SBOS006A – SEPTEMBER 2000 – REVISED DECEMBER 2015
Feature Description (continued)
For the unity-gain buffer, (a) in Figure 23, stability is preserved by adding a phase-lead network, R_C and C_C.
Voltage drop across R_C reduces output voltage swing with heavy loads. An alternate circuit, (b), does not limit
the output with low load impedance, and provides a small amount of positive feedback to reduce the net
feedback factor. Input impedance of this circuit falls at high frequency, as op amp gain rolloff reduces the
bootstrap action on the compensation network.
In Figure 23, (c) and (d) show compensation techniques for noninverting amplifiers. Like the follower circuits, the
circuit in (d) eliminates voltage drop due to load current, but at the penalty of somewhat reduced input
impedance at high frequency.
In Figure 23, (e) and (f) show input lead compensation networks for inverting and difference amplifier
configurations.
7.3.3 Noise Performance
Op amp noise is described by two parameters: noise voltage and noise current. The voltage noise determines
the noise performance with low source impedance. Low noise bipolar-input op amps such as the OPA27 and
OPA37 provide low voltage noise. However, if source impedance is greater than a few thousand Ωs, the current
noise of bipolar-input op amps react with the source impedance and dominate. At a few thousand Ωs source
impedance and above, the OPA2604 generally provides lower noise.
7.4 Device Functional Modes
The OPA2604 has a single functional mode and is operational when the power-supply voltage is greater than
±4.5 V. The maximum power supply voltage for the OPA2604 ±24 V.
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