RX610 Group
23. A/D Converter
R01UH0032EJ0120 Rev.1.20
Page 794 of 1006
Feb 20, 2013
Table 23.7 A/D Conversion Time
Item
Symbol
Formula
min
max
tD
tSPL
tSAM
tCONV
tCONV
PCLK (MHz)
4
+
ADCLK (MHz)
1
PCLK (MHz)
3
ADCLK (MHz)
25
ADCLK (MHz)
Setting value of ADSSTR
A/D conversion start delay time (1)
Input sampling time (2)
Successive conversion time (3)
A/D conversion time
*
1
A/D conversion time
*
2
Notes: 1. A/D conversion time in single mode and scan mode (first round)
2. A/D conversion time in scan mode (after the second round)
(1) + (2) + (3)
(2) + (3)
The examples of the calculation of A/D conversion times are listed below.
When PCLK = ADCLK = 50 MHz, ADSSTR = 19h, and the conversion is the second round in scan mode,
A/D conversion time (tCONV) = ADSSTR/ADCLK + 25/ADCLK
= 25/50 MHz + 25/50 MHz
= 0.5 μs + 0.5 μs
= 1.0 μs
When PCLK = ADCLK = 40 MHz, ADSSTR = 14h, and conversion is the first (min.) round in scan mode,
A/D conversion time (tCONV) = 3/PCLK + ADSSTR/ADCLK + 25/ADCLK
= 3/40 MHz + 20/40 MHz + 25/40 MHz
= 0.075 μs + 0.5 μs + 0.625 μs
= 1.2 μs
Summary of Contents for RX600 Series
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