OPA211_15 Datasheet, PDF (20/45 Pages) Texas Instruments – Low Power, Precision Operational Amplifier

OPA211, OPA2211
SBOS377H – OCTOBER 2006 – REVISED NOVEMBER 2015
R₁
R₂
Signal Gain = 1+ ^R2
R₁
Distortion Gain = 1+ ^R2
R₁ II R₃
R₃
OPA211
V_O = 3V_RMS
Generator
Output
Analyzer
Input
Audio Precision
System Two⁽¹⁾
with PC Controller
R_L
600W
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SIG. DIST.
GAIN GAIN R1 R2 R3
1 101 ¥ 1kW 10W
11 101 100W 1kW 11W
NOTE: (1) Measurement BW = 80kHz.
Figure 43. Distortion Test Circuit
8.4 Device Functional Modes
The OPAx211 is operational when the power-supply voltage is greater than 4.5 V (±2.25 V). The maximum
power supply voltage for the OPAx211 is 36 V (±18 V).
8.4.1 Shutdown
The shutdown (enable) function of the OPA211 is referenced to the positive supply voltage of the operational
amplifier. A valid high disables the operational amplifier. A valid high is defined as (V+) – 0.35 V of the positive
supply applied to the shutdown pin. A valid low is defined as (V+) – 3 V below the positive supply pin. For
example, with V_CC at ±15 V, the device is enabled at or below 12 V. The device is disabled at or above 14.65 V.
If dual or split power supplies are used, care should be taken to ensure the valid high or valid low input signals
are properly referred to the positive supply voltage. This pin must be connected to a valid high or low voltage or
driven, and not left open-circuit. The enable and disable times are provided in the Typical Characteristics section
(see Figure 39 through Figure 41). When disabled, the output assumes a high-impedance state.
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