NRF9E5 Datasheet, PDF (32/104 Pages) List of Unclassifed Manufacturers – 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC

PRODUCT SPECIFICATION
nRF9 E5 Single Chip Transceiver with Embedded Microcontroller and ADC
ADCCLK
SBCSN
analog
sampled
EOC
t
CONV
ADCDATA
Figure 8 Timing diagram single step conversion.
When ADCRUN is high the ADC is running continuously. Cycle time t_cycle is the time
between each conversion. EOC indicates every time a new conversion value is stored in
ADC_DATA_REG.
t_cycle
=
N
2
+1
ADCCLK cycles
where N is number of resolution bits. Figure 9 shows 10-bit conversion where
ADCRUN is set high.
analog sample
n
ADCCLK
n+1
n+2
EOC
t _Conv
ADCDATA
t _Cycle
sample n-1
sample n
Figure 9 Timing diagram continuous mode conversion.
A 500 kHz clock (ADCCLK) clocks the ADC converter. Table 20 shows t_cycles as
function of resolution.
Resolution
[Number of bits]
6
8
10
12
t_cycles
[µs]
8
10
12
14
Sampling rate
[kspls]
125
100
83.3
71.4
Table 20 ADC resolution and maximum sampling rate.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 32 of 104
June 2004