R0K561622S000BE Renesas Electronics America, R0K561622S000BE Datasheet - Page 767

KIT STARTER FOR H8SX/1622

R0K561622S000BE

Manufacturer Part Number
R0K561622S000BE
Description
KIT STARTER FOR H8SX/1622
Manufacturer
Renesas Electronics America
Series
Renesas Starter Kits (RSK)r
Type
MCUr
Datasheets

Specifications of R0K561622S000BE

Contents
Board, Cables, CD, Debugger, Power Supply
Silicon Manufacturer
Renesas
Features
Coding And Debugging, E10A Emulator, RS232 Serial Connection
Kit Contents
Board
Silicon Family Name
H8SX/1622F
Silicon Core Number
R5F61622N50LGV
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
H8SX/1622
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
18.7.5
This LSI's analog input is designed so that the conversion accuracy is guaranteed for an input
signal for which the signal source impedance is 5 kΩ or less. This specification is provided to
enable the A/D converter's sample-and-hold circuit input capacitance to be charged within the
sampling time; if the sensor output impedance exceeds 5 kΩ, charging may be insufficient and it
may not be possible to guarantee the A/D conversion accuracy. However, if a large capacitance is
provided externally for conversion in single mode, the input load will essentially comprise only
the internal input resistance of 10 kΩ, and the signal source impedance is ignored. However, since
a low-pass filter effect is obtained in this case, it may not be possible to follow an analog signal
with a large differential coefficient (e.g., 5 mV/µs or greater) (see figure 18.12). When converting
a high-speed analog signal or conversion in scan mode, a low-impedance buffer should be
inserted.
18.7.6
Adding capacitance results in coupling with GND, and therefore noise in GND may adversely
affect absolute accuracy. Be sure to make the connection to an electrically stable GND such as
AVss.
Care is also required to insure that filter circuits do not communicate with digital signals on the
mounting board, acting as antennas.
Sensor input
Permissible Signal Source Impedance
Influences on Absolute Accuracy
Sensor output
impedance
R ≤ 5 kΩ
Low-pass
filter
C = 0.1 µF
(recommended value)
Figure 18.12 Example of Analog Input Circuit
This LSI
Cin =
15 pF
Equivalent circuit of the A/D converter
Rev. 2.00 Sep. 16, 2009 Page 737 of 1036
10 kΩ
Section 18 A/D Converter
20 pF
REJ09B0414-0200

Related parts for R0K561622S000BE