MCP3201-CI/SN Microchip Technology, MCP3201-CI/SN Datasheet - Page 22

• Manufacturer Part Number: MCP3201-CI/SN
• Description: IC ADC 12BIT SINGLE CHAN 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP3201-CI/SN

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Number Of Bits: 12
• Sampling Rate (per Second): 100k
• Data Interface: Serial, SPI™
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Architecture: SAR
• Conversion Rate: 100 KSPs
• Input Type: Voltage
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP3201
6.2
When the MCP3201 initiates the sample period, charge
is stored on the sample capacitor. When the sample
period is complete, the device converts one bit for each
clock that is received. It is important for the user to note
that a slow clock rate will allow charge to bleed off the
sample cap while the conversion is taking place. At
85°C (worst case condition), the part will maintain
proper charge on the sample capacitor for at least
1.2 ms after the sample period has ended. This means
that the time between the end of the sample period and
the time that all 12 data bits have been clocked out
must not exceed 1.2 ms (effective clock frequency of
10 kHz). Failure to meet this criteria may induce
linearity errors into the conversion outside the rated
specifications. It should be noted that during the entire
conversion cycle, the A/D Converter does not require a
constant clock speed or duty cycle, as long as all timing
specifications are met.
6.3
If the signal source for the A/D Converter is not a low
impedance source, it will have to be buffered
or inaccurate
See
used to eliminate any signals that may be aliased back
into the conversion results. This is illustrated in
Figure 6-3
input of the MCP3201 device. This amplifier provides a
low impedance source for the converter input and a
low-pass filter, which eliminates unwanted high-
frequency noise.
Low-pass (anti-aliasing) filters can be designed using
Microchip’s interactive FilterLab
will calculate capacitor and resistor values, as well as
determine the number of poles that are required for the
application. For more information on filtering signals,
see the application note AN699 “Anti-Aliasing Analog
Filters for Data Acquisition Systems.”
DS21290E-page 22
Figure
Maintaining Minimum Clock Speed
Buffering/Filtering the Analog
Inputs
where an op amp is used to drive the analog
4-2. It is also recommended that a filter be
conversion
results
®
software. FilterLab
may
occur.
FIGURE 6-3:
Amplifier is used to implement a 2nd order anti-
aliasing filter for the signal being converted by
the MCP3201 device.
V
IN
R
1
0.1 µF
C
R
C
1
2
2
Reference
4.096V
R
MCP1541
MCP601
3
+
-
R
4
The MCP601 Operational
© 2008 Microchip Technology Inc.
C
10 µF
L
IN+
IN-
V
MCP3201
REF
V
DD
10 µF
1 µF