TLV333, TLV2333, TLV4333

SBOS751 – DECEMBER 2015

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10 Power Supply Recommendations

The TLV333 is specified for operation from 1.8 V to 5.5 V (±0.9 V to ±2.75 V); many specifications apply from

–40°C to +125°C. The Typical Characteristics section presents parameters that can exhibit significant variance

with regard to operating voltage or temperature.

CAUTION

Supply voltages larger than 7 V can permanently damage the device (see the Absolute

Maximum Ratings table).

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 the Layout

section.

11 Layout

11.1 Layout Guidelines

11.1.1 General Layout Guidelines

Attention to good layout practice is always recommended. Keep traces short and, when possible, use a printed

circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible.

Place a 0.1-

μF capacitor closely across the supply pins. Apply these guidelines throughout the analog circuit to

improve performance and to provide benefits such as reducing the electromagnetic interference (EMI)

susceptibility.

For lowest offset voltage and precision performance, circuit layout and mechanical conditions must be optimized.

Avoid temperature gradients that create thermoelectric (Seebeck) effects in the thermocouple junctions formed

from connecting dissimilar conductors. These thermally-generated potentials can be made to cancel by assuring

they are equal on both input terminals. Other layout and design considerations include:

•

Use low thermoelectric-coefficient conditions (avoid dissimilar metals).

•

Thermally isolate components from power supplies or other heat sources.

•

Shield op amp and input circuitry from air currents, such as cooling fans.

Following these guidelines reduces the likelihood of junctions being at different temperatures, which can cause

thermoelectric voltages of 0.1

μV/°C or higher, depending on materials used.

16

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