MCP3423-E/UN Microchip Technology, MCP3423-E/UN Datasheet - Page 34

• Manufacturer Part Number: MCP3423-E/UN
• Description: IC ADC 18BIT 3.75SPS 2CH 10-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP3423-E/UN

• Data Interface: I²C, Serial
• Number Of Bits: 18
• Sampling Rate (per Second): 3.75
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP (0.118", 3.00mm Width)
• Resolution (bits): 18bit
• Sampling Rate: 3.75SPS
• Input Channel Type: Differential
• Supply Voltage Range - Analog: 2.7V To 5.5V
• Supply Current: 145µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP3423EV - BOARD EVAL 18BIT 2CH ADC MCP3423
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP3422/3/4
Figure
for four-channel thermocouple temperature measure-
ment applications.
FIGURE 6-6:
With Type K thermocouple, it can measure tempera-
ture from 0°C to 1250°C degrees. The full scale output
range of the Type K thermocouple is about 50 mV. This
provides 40 µV/°C (= 50 mV/1250°C) of measurement
resolution.
get for sensor signal using the MCP3422/3/4 device
with 18 bits and PGA = 8 settings. With this configura-
tion, the MCP3424 can detect the input signal level as
low as approximately 2 µV. The internal PGA boosts
the input signal level eight times. The 40 µV/°C input
from the thermocouple is amplified internally to
320 µV/°C before the conversion takes place. This
results in 20.48 LSB/°C output codes. This means
there are about 20 LSB output codes (or about 4.32
bits) per 1°C of change in temperature.
DS22088B-page 34
Thermocouple Sensor
Heat
6-6, shows an example of using the MCP3424
Equation 6-1
MCP9800
MCP9800
Four-Channel Thermocouple Applications.
shows the measurement bud-
Isothermal Block
SDA
SCL
SDA
SCL
0.1 µF
10 µF
1
2
3
4
5
6
7
SDA
CH1+
CH2+
5 kΩ
CH1-
SDA
CH2-
V
V
SS
DD
MCP3424
CH4+
CH3+
CH4-
CH3-
Adr1
Adr0
SCL
EQUATION 6-1:
Where:
Detectable Input Signal Level
Input Signal Level after gain of 8:
14
13
12
11
10
1 LSB
9
8
No. of LSB/°C
SCL
5 kΩ
(MASTER)
T
O
MCU
V
V
=
DD
DD
15.625 µV with 18 bit configuration
SDA
=
SDA
Isothermal Block
320
------------------------ -
=
15.625
SCL
MCP9800
MCP9800
=
© 2008 Microchip Technology Inc.
(
μ
40
SCL
1.953125μV for PGA
V/°C
μ
μ
V/°C
V
=
=
15.625
) 8
20.48 Codes/°C
•
=
μ
V/PGA
320
μ
V/°C
=
8