OPA354_16 Datasheet, PDF (23/44 Pages) Texas Instruments – 250-MHz, Rail-to-Rail I/O, CMOS Operational Amplifiers

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OPA354, OPA2354, OPA4354
SBOS233F – MARCH 2002 – REVISED JUNE 2016
10 Power Supply Recommendations
The OPAx354 family of devices is specified for operation from 2.5 V to 5.5 V (±1.25 to ±2.75 V); many
specifications apply from –40°C to 125°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are shown Typical Characteristics.
Place 0.1-µF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or high
impedance power supplies. For more detailed information on bypass capacitor placement, see Layout
Guidelines.
11 Layout
11.1 Layout Guidelines
Good high-frequency printed-circuit board (PCB) layout techniques must be employed for the OPA354. Generous
use of ground planes, short and direct signal traces, and a suitable bypass capacitor located at the V+ pin assure
clean, stable operation. Large areas of copper also provides a means of dissipating heat that is generated in
normal operation.
TI does not recommend using sockets with any high-speed amplifier.
A 10-nF ceramic bypass capacitor is the minimum recommended value; adding a 1-µF or larger tantalum
capacitor in parallel can be beneficial when driving a low-resistance load. Providing adequate bypass
capacitance is essential to achieving very low harmonic and intermodulation distortion.
11.2 Layout Example
Figure 39. Operational Amplifier Board Layout for Noninverting Configuration
11.3 Power Dissipation
Power dissipation depends on power-supply voltage, signal and load conditions. With DC signals, power
dissipation is equal to the product of output current times the voltage across the conducting output transistor,
V_S − V_O. Power dissipation can be minimized by using the lowest possible power-supply voltage necessary to
assure the required output voltage swing.
For resistive loads, the maximum power dissipation occurs at a DC output voltage of one-half the power-supply
voltage. Dissipation with AC signals is lower. AB-039 Power Amplifier Stress and Power Handling Limitations
explains how to calculate or measure power dissipation with unusual signals and loads, and can be found at
www.ti.com.
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Product Folder Links: OPA354 OPA2354 OPA4354