OPA2604 Datasheet, PDF (11/26 Pages) Burr-Brown (TI) – Dual FET-Input, Low Distortion OPERATIONAL AMPLIFIER

www.ti.com
Feature Description (continued)
R₁
R₂
1
2
R₃
OPA2604
Generator
Output
Analyzer
Input
OPA2604
SBOS006A – SEPTEMBER 2000 – REVISED DECEMBER 2015
V_O = 10Vp-p
(3.5Vrms)
SIG. DIST.
GAIN GAIN R1 R2 R3
1 101 ∞ 5kΩ 50Ω
10 101 500Ω 5kΩ 500Ω
100 101 50Ω 5kΩ ∞
Audio Precision
R_L
System One
1kΩ
Analyzer*
IBM PC
or
Compatible
* Measurement BW = 80kHz
Figure 22. Distortion Test Circuit
Validity of this technique can be verified by duplicating measurements at high gain or high frequency, where the
distortion is within the measurement capability of the test equipment. Measurements for this data sheet were
made with the Audio Precision System One, which simplifies such repetitive measurements. The measurement
technique can, however, be performed with manual distortion measurement instruments.
7.3.2 Capacitive Loads
The dynamic characteristics of the OPA2604 are optimized for commonly encountered gains, loads, and
operating conditions. The combination of low closed-loop gain and capacitive load decreases the phase margin
and may lead to gain-peaking or oscillations. Load capacitance reacts with the open-loop output resistance of the
op amp to form an additional pole in the feedback loop. Figure 23 shows various circuits which preserve phase
margin with capacitive load. Request Application Bulletin AB-028 for details of analysis techniques and
applications circuits.
Copyright © 2000–2015, Texas Instruments Incorporated
Product Folder Links: OPA2604
Submit Documentation Feedback
11