UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1336 of 1441
NXP Semiconductors
UM10503
Chapter 48: 12-bit ADC (ADCHS)
48.4 Pin description
48.5 General description
Basic clocking for the A/D converter is provided by BASE_ADCHS_CLK. This clock
frequency (fADC) can be up to 80 MHz. The conversion takes one clock cycle. Data is
available, after the conversion latency, in the output FIFO and channel output registers.
The FIFO and registers are clocked by the AHB clock. The FIFO can be read by general
purpose DMA or software.
The conversion sequence is defined by two descriptor tables (see
and
). The tables can be loaded by general purpose DMA or software.
Remark:
When sampling long sequences that do not fit in the FIFO, the AHB clock should
be chosen sufficient high to be able to transfer the output samples across the AHB before
the FIFO overflows.
Table 1120.ADCHS pin description
Pin
Type
Description
ADCHS_0
Analog input
12-bit high-speed ADC input channel 0.
ADCHS_1
Analog input
12-bit high-speed ADC input channel 1.
ADCHS_2
Analog input
12-bit high-speed ADC input channel 2.
ADCHS_3
Analog input
12-bit high-speed ADC input channel 3.
ADCHS_4
Analog input
12-bit high-speed ADC input channel 4.
ADCHS_5
Analog input
12-bit high-speed ADC input channel 5.
ADCHS_NEG
-
12-bit high-speed ADC reference voltage output or negative
differential input.
VSSA
-
Ground.