参数资料
型号: SPC560B50L3-ENG
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 64 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-100
文件页数: 91/113页
文件大小: 983K
代理商: SPC560B50L3-ENG
SPC560Bx, SPC560Cx
Electrical characteristics
Doc ID 14619 Rev 7
impedance of the transducer or circuit supplying the analog signal to be measured. The filter
at the input pins must be designed taking into account the dynamic characteristics of the
input signal (bandwidth) and the equivalent input impedance of the ADC itself.
In fact a current sink contributor is represented by the charge sharing effects with the
sampling capacitance: CS being substantially a switched capacitance, with a frequency
equal to the conversion rate of the ADC, it can be seen as a resistive path to ground. For
instance, assuming a conversion rate of 1 MHz, with CS equal to 3 pF, a resistance of
330 k
is obtained (R
EQ = 1 / (fc*CS), where fc represents the conversion rate at the
considered channel). To minimize the error induced by the voltage partitioning between this
resistance (sampled voltage on CS) and the sum of RS + RF + RL + RSW + RAD, the external
circuit must be designed to respect the Equation 4:
Equation 4
Equation 4 generates a constraint for external network design, in particular on a resistive
path. Internal switch resistances (RSW and RAD) can be neglected with respect to external
resistances.
Figure 17. Input equivalent circuit (precise channels)
V
A
R
S
R
F
R
L
R
SW
R
AD
++
+
R
EQ
---------------------------------------------------------------------------
1
2
---LSB
RF
CF
RS
RL
RSW1
CP2
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
CP1
RAD
Channel
Selection
VA
RS
Source Impedance
RF
Filter Resistance
CF
Filter Capacitance
RL
Current Limiter Resistance
RSW1 Channel Selection Switch Impedance
RAD Sampling Switch Impedance
CP
Pin Capacitance (two contributions, CP1 and CP2)
CS
Sampling Capacitance
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