OPA4277-EP Datasheet, PDF (14/20 Pages) Texas Instruments – OPA4277-EP High Precision Operational Amplifier

OPA4277-EP
SBOS714 – NOVEMBER 2014
www.ti.com
9 Power Supply Recommendations
OPA4277 operates from ±2- to ±18-V supplies with excellent performance. Unlike most operational amplifiers
which are specified at only one supply voltage, the OPA4277 is specified for real-world applications; a single limit
applies over the ±5- to ±15-V supply range. This allows a customer operating at V_S = ±10 V to have the same
assured performance as a customer using ±15-V supplies. In addition, key parameters are assured over the
specified temperature range, –55°C to 125°C. Most behavior remains unchanged through the full operating
voltage range (±2 to ±18 V). Parameters which vary significantly with operating voltage or temperature are shown
in the typical performance curves.
10 Layout
10.1 Layout Guidelines
The leadframe die pad should be soldered to a thermal pad on the PCB. Mechanical drawings located in
Mechanical, Packaging, and Orderable Information show the physical dimensions for the package and pad.
Soldering the exposed pad significantly improves board-level reliability during temperature cycling, key push,
package shear, and similar board-level tests. Even with applications that have low-power dissipation, the
exposed pad must be soldered to the PCB to provide structural integrity and long-term reliability.
The OPA4277 has very-low offset voltage and drift. To achieve highest performance, optimize circuit layout and
mechanical conditions. Offset voltage and drift can be degraded by small thermoelectric potentials at the
operational amplifier inputs. Connections of dissimilar metals generate thermal potential, which can degrade the
ultimate performance of the OPA4277. Cancel these thermal potentials by assuring that they are equal in both
input terminals.
• Keep the thermal mass of the connections made to the two input terminals similar.
• Locate heat sources as far as possible from the critical input circuitry.
• Shield operational amplifier and input circuitry from air currents such as cooling fans.
14
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