mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 224

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

10.8.3 Analog Supply Filtering and Grounding
10-16
MOTOROLA
Two important factors influencing performance in analog integrated circuits are supply
filtering and grounding. Generally, digital circuits use bypass capacitors on every V
V
as bypassing, is the distribution of power and ground.
Analog supplies should be isolated from digital supplies as much as possible. This ne-
cessity stems from the higher performance requirements often associated with analog
circuits. Therefore, deriving an analog supply from a local digital supply is not recom-
mended. However, if for economic reasons digital and analog power are derived from
a common regulator, filtering of the analog power is recommended in addition to the
bypassing of the supplies already mentioned. For example, a RC low pass filter could
be used to isolate the digital and analog supplies when generated by a common reg-
ulator. If multiple high precision analog circuits are locally employed (such as two A/D
converters), the analog supplies should be isolated from each other as sharing sup-
plies introduces the potential for interference between analog circuits.
SS
pin pair. This applies to analog subsystems or submodules also. Equally important
3FE
3FD
3FC
3FB
3FA
3FF
8
7
6
5
4
3
2
1
0
Figure 10-5 Errors Resulting from Clipping
.010
Freescale Semiconductor, Inc.
For More Information On This Product,
ANALOG-TO-DIGITAL CONVERTER
.020
INPUT IN VOLTS (V
Go to: www.freescale.com
.030
5.100
RH
= 5.120 V, V
5.110
RL
5.120
= 0 V)
5.130
MC68HC16Y3/916Y3
USER’S MANUAL
ADC CLIPPING
DD
/