OPA2836-Q1 Datasheet, PDF (37/44 Pages) Texas Instruments – Very-Low Power, Rail-to-Rail Out, Negative-Rail In, Voltage-Feedback Operational Amplifier

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OPA2836-Q1
SBOS794 – DECEMBER 2016
10 Power Supply Recommendations
The OPA2836-Q1 is principally intended to work in a supply range of 2.7 V to 5 V. Supply voltage tolerances are
supported with the specified operating range of 2.5 V (7% on a 2.7-V supply) and 5.5 V (10% on a 5-V supply).
Good power-supply bypassing is required. Minimize the distance (< 0.1 inch) from the power-supply pins to high-
frequency, 0.1-μF decoupling capacitors. Often a larger capacitor (2.2 µF, typical) is used along with a high-
frequency, 0.1-µF supply decoupling capacitor at the device supply pins. For single-supply operation, only the
positive supply has these capacitors. When a split supply is used, use these capacitors for each supply to
ground. If necessary, place the larger capacitors somewhat farther from the device and share these capacitors
among several devices in the same area of the PCB. Avoid narrow power and ground traces to minimize
inductance between the pins and the decoupling capacitors. An optional supply decoupling capacitor across the
two power supplies (for bipolar operation) improves second-harmonic distortion performance.
11 Layout
11.1 Layout Guidelines
The OPA835DBV, OPA836DBV EVM (SLOU314) must be used as a reference when designing the circuit board.
Follow the EVM layout of the external components near to the amplifier, ground plane construction, and power
routing as closely as possible. General guidelines are:
1. Signal routing must be direct and as short as possible into an out of the operational amplifier.
2. The feedback path must be short and direct avoiding vias if possible especially with G = +1.
3. Ground or power planes must be removed from directly under the negative input and output pins of the
amplifier.
4. A series output resistor is recommended to be placed as near to the output pin as possible. See Figure 17
for recommended values given expected capacitive load of design.
5. A 2.2-µF power-supply decoupling capacitor must be placed within 2 inches of the device and can be shared
with other operational amplifiers. For spit supply, a capacitor is required for both supplies.
6. A 0.1-µF power-supply decoupling capacitor must be placed as near to the power supply pins as possible.
Preferably within 0.1 inch. For split supply, a capacitor is required for both supplies.
Copyright © 2016, Texas Instruments Incorporated
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