参数资料
型号: TMP86CH47SUG
厂商: Toshiba Corporation
英文描述: Zener Diode; Application: General; Pd (mW): 500; Vz (V): 18.1 to 19.0; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
中文描述: 8位微控制器
文件页数: 145/160页
文件大小: 1627K
代理商: TMP86CH47SUG
Page 137
TMP86CH47SUG
12.6 Precautions about AD Converter
12.6.1 Analog input pin voltage range
Make sure the analog input pins (AIN0 to AIN7) are used at voltages within VAREF to AVSS. If any volt-
age outside this range is applied to one of the analog input pins, the converted value on that pin becomes uncer-
tain. The other analog input pins also are affected by that.
12.6.2 Analog input shared pins
The analog input pins (AIN0 to AIN7) are shared with input/output ports. When using any of the analog
inputs to execute AD conversion, do not execute input/output instructions for all other ports. This is necessary
to prevent the accuracy of AD conversion from degrading. Not only these analog input shared pins, some other
pins may also be affected by noise arising from input/output to and from adjacent pins.
12.6.3 Noise Countermeasure
The internal equivalent circuit of the analog input pins is shown in Figure 12-5. The higher the output
impedance of the analog input source, more easily they are susceptible to noise. Therefore, make sure the out-
put impedance of the signal source in your design is 5 k
or less. Toshiba also recommends attaching a capac-
itor external to the chip.
Figure 12-5 Analog Input Equivalent Circuit and Example of Input Pin Processing
DA converter
AINi
Analog comparator
Internal resistance
5 k
(typ)
Permissible signal
source impedance
5 k
(max)
Internal capacitance
C = 22 pF (typ.)
Note) i = 7 to 0
相关PDF资料
PDF描述
TMP86CH49FG Zener Diode; Application: General; Pd (mW): 500; Vz (V): 18.8 to 19.7; Condition Iz at Vz (mA): 2; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
TMP86CH72FG Zener Diode; Application: General; Pd (mW): 500; Vz (V): 19.5 to 20.4; Condition Iz at Vz (mA): 2; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
TMP86CK74AFG Zener Diode; Application: General; Pd (mW): 500; Vz (V): 20.2 to 21.1; Condition Iz at Vz (mA): 2; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
TMP86CM23AUG Zener Diode; Application: General; Pd (mW): 500; Vz (V): 20.9 to 21.9; Condition Iz at Vz (mA): 2; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
TMP86CM27FG Zener Diode; Application: General; Pd (mW): 500; Vz (V): 21.6 to 22.6; Condition Iz at Vz (mA): 2; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
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