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LPC844 Datasheet(PDF) 72 Page - NXP Semiconductors |
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LPC844 Datasheet(HTML) 72 Page - NXP Semiconductors |
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72 / 97 page  LPC84x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved. Product data sheet Rev. 1.7 — 27 February 2018 72 of 97 NXP Semiconductors LPC84x 32-bit Arm Cortex-M0+ microcontroller 13.2.1 ADC input impedance Figure 34 shows the ADC input impedance. In this figure: • ADCx represents ADC input channel 0. • ADCy represents ADC input channels 1 to 11. • R1 and Rsw are the switch-on resistance on the ADC input channel. • If ADC input channel 0 is selected, the ADC input signal goes through R1 + Rsw to the sampling capacitor (Cia). • If ADC input channels 1 to 11 are selected, the ADC input signal goes through Rsw to the sampling capacitor (Cia). • Typical values, R1 = 2.5 k, Rsw = 25 • See Table 11 for Cio. • See Table 27 for Cia. Fig 34. ADC input impedance DAC ADC Rsw R1 Cia ADCx ADCy Cio Cio aaa-017600 |
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