MCP3423EV Microchip Technology, MCP3423EV Datasheet - Page 35

• Manufacturer Part Number: MCP3423EV
• Description: BOARD EVAL 18BIT 2CH ADC MCP3423
• Manufacturer: Microchip Technology

Specifications of MCP3423EV

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 3.75
• Data Interface: Serial
• Inputs Per Adc: 2 Differential
• Input Range: ±VREF
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP3423
• Silicon Manufacturer: Microchip
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: MCP3423
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Equation 6-2
expected number of output code with various PGA gain
settings for Type K thermocouple output.
EQUATION 6-2:
FIGURE 6-7:
Figure 6-7
pressure and temperature. The pressure is measured
by using NPP 301 (manufactured by GE NovaSensor),
and temperature is measured by a thermistor.
The pressure sensor output is 20 mV/V. This gives
100 mV of full scale output for V
© 2009 Microchip Technology Inc.
Where:
Expected
Number of Output Code =
1 LSB = 15.625 µV with 18 Bit configuration.
Thermistor
shows an example of measuring both
shows an example of calculating the
V
DD
V
R
DD
R
1
2
Pressure Sensor
EXPECTED NUMBER OF
OUTPUT CODE FOR TYPE
K THERMOCOUPLE
Example of Pressure and Temperature Measurement.
(NPP301)
= 11.6 bits for PGA = 1
= 12.6 bits for PGA = 2
= 13.6 bits for PGA = 4
= 14.6 bits for PGA = 8
log
2
⎛
⎜
⎜
⎝
0.1 µF
----------------------- -
15.625
----------------------- -
DD
50 mV
V
PGA
10 µF
IN
of 5V (sensor
μ
V
⎞
⎟
⎟
⎠
V
R
IN
1
1
2
3
4
5
6
7
5 kΩ
and R
CH1+
CH1-
CH2+
CH2-
V
V
SDA
=
SS
DD
MCP3424
------------------ -
R
2
1
R
= Voltage Divider
+
2
R
CH4+
CH3+
2
CH4-
CH3-
Adr1
Adr0
SCL
×
V
excitation voltage).
calculating the number of output code for the full scale
output of the NPP301.
5 kΩ
DD
13
10
14
12
11
9
8
V
IN
V
DD
(MASTER)
V
T
DD
O
Equation 6-3
MCP3422/3/4
MCU
V
DD
R
R
2
shows an example of
1
Pressure Sensor
V
DD
DS22088C-page 35
(NPP301)
Thermistor