SBOSAB8A June 2023 – December 2023 TLV365-Q1
PRODMIX
Refer to the PDF data sheet for device specific package drawings
Certain single-supply applications require the op‑amp output to swing from 0 V to a positive full-scale voltage and have high accuracy. An example is an op amp employed to drive a single-supply ADC having an input range from 0 V to 3.3 V. Rail-to-rail output amplifiers with very light output loading can achieve an output level within few millivolts of 0 V (or V+ at the high end), but not true 0 V. Furthermore, the deviation from 0 V only becomes greater as the required load current increases. This increased deviation is a result of limitations of the CMOS output stage.
When a pulldown resistor is connected from the amplifier output to a negative voltage source, the TLVx365-Q1 can achieve an output level of 0 V, and even a few millivolts below 0 V. Figure 8-3 shows a circuit using this technique.
A pulldown current of approximately 500 μA is required when TLVx365-Q1 is connected as a unity-gain buffer. Pulldown resistor RL is calculated from RL = [(VO − VNEG) / (500 μA)].
Figure 8-33 shows the offset voltage vs output swing.
VS = ±2.75 V |