The LFx98x devices are monolithic sample-and-hold circuits that use BI-FET technology to obtain ultrahigh DC accuracy with fast acquisition of signal and low droop rate. Operating as a unity-gain follower, DC gain accuracy is 0.002% typical and acquisition time is as low as 6 µs to 0.01%. A bipolar input stage is used to achieve low offset voltage and wide bandwidth. Input offset adjust is accomplished with a single pin and does not degrade input offset drift. The wide bandwidth allows the LFx98x to be included inside the feedback loop of 1-MHz operational amplifiers without having stability problems. Input impedance of 1010 Ω allows high-source impedances to be used without degrading accuracy.
P-channel junction FETs are combined with bipolar devices in the output amplifier to give droop rates as low as 5 mV/min with a 1-µF hold capacitor. The JFETs have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design ensures no feedthrough from input to output in the hold mode, even for input signals equal to the supply voltages.
Logic inputs on the LFx98x are fully differential with low input current, allowing for
direct connection to TTL, PMOS, and CMOS. Differential threshold is
1.4 V. The LFx98x will operate from ±5-V to ±18-V supplies.
An A version is available with tightened electrical specifications.
| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha |
|---|---|---|---|---|---|
| * | Hoja de datos | LFx98x Monolithic Sample-and-Hold Circuits datasheet (Rev. C) | PDF | HTML | 5/10/2018 | |
| Nota sobre la aplicación | AN-301 Signal Conditioning for Sophisticated Transducers (Rev. B) | 6/05/2013 | |||
| Nota sobre la aplicación | AN-298 Isolation Techniques for Signal Conditioning (Rev. B) | 6/05/2013 | |||
| Nota sobre la aplicación | Applications of the LM3524 Pulse Width Modulator (Rev. B) | 23/04/2013 | |||
| Nota sobre la aplicación | Using ADC0808/809 8-Bit uP Compble ADCs w/8-Chan Analog Multiplexr (Rev. B) | 22/04/2013 | |||
| Nota sobre la aplicación | Data Acq Using ADC0816 & ADC0817 8-Bit ADC w/On-Chip 16 Chan Multiplexr | 10/05/2004 | |||
| Nota sobre la aplicación | AN-294 Special Sample and Hold Techniques | 10/05/2004 | |||
| Nota sobre la aplicación | Specifications and Architectures of Sample-and-Hold Amplifiers | 3/05/2004 | |||
| Nota sobre la aplicación | Freq-to-Vltg Converter Uses Sample-and-Hold to Improve Response & Ripple | 3/10/2002 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| SOIC (D) | 14 | Ultra Librarian |
| PDIP (P) | 8 | Ultra Librarian |
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