The LM7705 device is a switched capacitor voltage inverter with a low noise, −0.23 V fixed negative voltage regulator. This device is designed to be used with low voltage amplifiers to enable the amplifiers output to swing to zero volts. The −0.23 V is used to supply the negative supply pin of an amplifier while maintaining less then 5.5 V across the amplifier. Rail-to-Rail output amplifiers cannot output zero volts when operating from a single-supply voltage and can result in error accumulation due to amplifier output saturation voltage being amplified by following gain stages. A small negative supply voltage will prevent the amplifiers output from saturating at zero volts and will help maintain an accurate zero through a signal processing chain. Additionally, when an amplifier is used to drive an input of the ADC, the amplifier can output a zero voltage signal and the full input range of an ADC can be used. The LM7705 device has a shutdown pin to minimize standby power consumption.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM7705 Low-Noise Negative Bias Generator datasheet (Rev. D) | PDF | HTML | May 8, 2018 |
| Circuit design | Charge pump circuit (–0.3V) for negative amplifier supply (Rev. A) | PDF | HTML | Aug 21, 2024 | |
| Application note | Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) | PDF | HTML | May 23, 2022 | |
| Technical article | How to achieve microvoltage-level precision in thermopile applications | PDF | HTML | Dec 9, 2021 | |
| Application note | Attenuator Amplifier Design to Maximize the Input Voltage of Differential ADCs | Jun 14, 2018 | ||
| Technical article | Unique active mux capability combines buffer and switch into one solution | PDF | HTML | Oct 10, 2017 |
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The ADS8168 evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the performance of the ADS8168 successive-approximation register (SAR) analog-to-digital converter (ADC). The ADS8168EVM-PDK includes the ADS8168EVM board, the precision host interface (PHI) (...)
This evaluation board is designed to demonstrate the functionality of Texas Instruments LM7705 Low Noise Negative Bias Generator. The board has a dual Operational Amplifier that can be connected to ground or biased with the on board LM7705. In the last case a True zero amplifier is demonstrated.
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
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