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TLV8801, TLV8802

SNOSD34 – AUGUST 2016

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7 Detailed Description

7.1 Overview

The TLV8801 (single) and TLV8802 (dual) series nanoPower CMOS operational amplifiers are designed for long-

life battery-powered and energy harvested applications. They operate on a single supply with operation as low as

1.7 V. The output is rail-to-rail and swings to within 3.5mV of the supplies with a 100kΩ load. The common-mode

range extends to the negative supply making it ideal for single-supply applications. EMI protection has been

employed internally to reduce the effects of EMI.

Parameters that vary significantly with operating voltages or temperature are shown in the Typical Characteristics

curves.

7.2 Functional Block Diagram

7.3 Feature Description

The amplifier's differential inputs consist of a non-inverting input (+IN) and an inverting input (–IN). The amplifer

amplifies only the difference in voltage between the two inputs, which is called the differential input voltage. The

where

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microvolt).

(1)

7.4 Device Functional Modes

7.4.1 Negative-Rail Sensing Input

The input common-mode voltage range of the TLV880x extends from (V-) to (V+) – 0.9 V. In this range, low

offset can be expected with a minimum of 80dB CMRR. The TLV880x is protected from output "inversions" or

"reversals".

7.4.2 Rail to Rail Output Stage

The TLV880x output voltage swings 3.5 mV from rails at 1.8 V supply, which provides the maximum possible

dynamic range at the output. This is particularly important when operating on low supply voltages.

The TLV880x Maximum Output Voltage Swing graph defines the maximum swing possible under a particular

output load.

7.4.3 Design Optimization for Nanopower Operation

When designing for ultralow power, choose system feedback components carefully. To minimize quiecent current

consumption, select large-value feedback resistors. Any large resistors will react with stray capacitance in the

circuit and the input capacitance of the operational amplifier. These parasitic RC combinations can affect the

stability of the overall system. A feedback capacitor may be required to assure stability and limit overshoot or

gain peaking.