MC68F375BGMZP33 Freescale Semiconductor, MC68F375BGMZP33 Datasheet - Page 232

• Manufacturer Part Number: MC68F375BGMZP33
• Description: IC MPU 32BIT 33MHZ 217-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68F375BGMZP33

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 217-PBGA
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Program Memory Type: Flash
• Program Memory Size: 256 KB
• Data Ram Size: 10 KB
• Interface Type: SPI, SCI, CAN
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 16
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: No

5.13.3 Pin Connection and Performance Considerations
MC68F375
REFERENCE MANUAL
The performance of an ANXx pin is almost the same as that of an ANx input to the
QADC64. There are two differences: there is an increased resistance because of the
additional multiplexer switch in series, and there is no buffering between channels
within the groups of 8. If the increased resistance becomes a problem it can be com-
pensated for by increasing the input sample time (IST[7:6] in the Conversion
Command Word Table of the QADC64). The lack of buffering between channels
causes additional dynamic charging current to flow into the analog pins during succes-
sive conversions of different voltages. A schematic of one group of eight inputs which
illustrates the cause of this charging current is shown in figure
If alternating between 2 AMUX channels within the group of eight, one at V
other at V
and V
source, and mux resistances. The error due to the charging current is expressed by
the following equation:
Where: C
For an error equal to 1/2 LSB, the following equation must be met:
As an example, if C
This charging current is also present on normal QADC64 channels, but to a lesser
extent because C
For a discussion of other pin connection and performance considerations, please refer
to
5.3 QADC64 Pin
rl
. This generates an average current which flows across the sum of the filter,
EQ
rl
, the equivalent capacitance C
= C
QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE-64
MUXOUT
ERROR = I
MUXOUT
EQ
Freescale Semiconductor, Inc.
Functions.
For More Information On This Product,
= 2.0 pF and R
+ C
R
and R
C
EQ =
P
EQ
AVG
Go to: www.freescale.com
* R
R
MUXOUT
* R
SOURCE
Rev. 25 June 03
EQ
EQ
EQ
< 1/(2048*sample_rate)
V = V
= V * sample_rate * C
= 50K
EQ
are both zero.
+ R
must be charged/discharged between V
rh
FILTER
,
- V
the maximum sample_rate is 4.9 KHz.
rl
+ R
MUXOUT
EQ
Figure
* R
EQ
5-14.
MOTOROLA
rh
and the
5-56
rh