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LPC802 数据表(PDF) 60 Page - NXP Semiconductors |
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LPC802 数据表(HTML) 60 Page - NXP Semiconductors |
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60 / 83 page  LPC802 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved. Product data sheet Rev. 1.6 — 27 April 2018 60 of 83 NXP Semiconductors LPC802 32-bit ARM Cortex-M0+ microcontroller 14.2.1 ADC input impedance Figure 31 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 = 5.6 k, Rsw = 6.9 k • To calculate total resistance, use the following equation: – RTOTAL = Rexternal + Rinternal – Rexternal = External resistance on the ADC input channel. – Rinternal for channel 0 = R1 +RSW = 12.5 k. – Rinternal for channels 1 to 11 = 6.9 k. • See Table 11 for Cio. • See Table 25 for Cia. Fig 31. ADC input impedance DAC ADC Rsw R1 Cia ADCx ADCy Cio Cio aaa-017600 |
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