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参数资料
| 型号： | MCP3422EV |
| 厂商： | Microchip Technology |
| 文件页数： | 28/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MCP3422 PICKIT SERIAL |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 系列： | PICkit™ |
| ADC 的数量： | 2 |
| 位数： | 18 |
| 采样率（每秒）： | 3.75 |
| 数据接口： | 串行 |
| 输入范围： | ±2.048 V |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | MCP3422 |
| 已供物品： | 板 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 相关产品： | MCP3422A0T-E/SNTR-ND - IC ADC 18BIT 3.75SPS 2CH 8-SOIC MCP3422A0T-E/MSTR-ND - IC ADC 18BIT 3.75SPS 2CH 8-MSOP MCP3422A0T-E/MCTR-ND - IC ADC 18BIT 3.75SPS 2CH 8-DFN MCP3422A0-E/SN-ND - IC ADC 18BIT3.75SPS 2CH 8-SOIC MCP3422A0-E/MS-ND - IC ADC 18BIT 3.75SPS 2CH 8-MSOP MCP3422A0-E/MC-ND - IC ADC 18BIT 3.75SPS 2CH 8-DFN |
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MCP3422/3/4
DS22088C-page 34
2009 Microchip Technology Inc.
shows
an
example
of
using
the
MCP3424 for four-channel thermocouple temperature
measurement applications.
FIGURE 6-6:
Four-Channel Thermocouple Applications.
With
Type
K
thermocouple,
it
can
measure
temperature from 0°C to 1250°C degrees. The full
scale output range of the Type K thermocouple is
about 50 mV. This provides 40 V/°C (= 50 mV/
1250°C) of measurement resolution. Equation 6-1
shows the measurement budget for sensor signal using
the
MCP3422/3/4
device
with
18 bits
and
PGA = 8 settings.
With
this
configuration,
the
MCP3424 can detect the input signal level as low as
approximately 2 V. The internal PGA boosts the input
signal level eight times. The 40 V/°C input from the
thermocouple is amplified internally to 320 V/°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.
EQUATION 6-1:
5k
Ω
VDD
4
5
6
9
CH2-
VSS
CH3+
3
12
CH2+
CH3-
2
13
CH1-
CH4+
1
14
CH1+
CH4-
7
8
SDA
SCL
VDD
11
10
0.1 F
10 F
TO MCU
(MASTER)
MCP9800
Isothermal Block
Thermocouple Sensor
Heat
SCL
SDA
SCL
SDA
SCL
VDD
SDA
SCL
SDA
SCL
Adr1
Adr0
5k
Ω
MCP3424
Input Signal Level after gain of 8:
Where:
1 LSB
=
15.625 V with 18 bit configuration
Detectable Input Signal Level
15.625
μV/PGA
=
1.953125
μV for PGA 8
=
40
μV/°C
() 8
320
μV/°C
=
=
No. of LSB/°C
320
μV/°C
15.625
μV
-------------------------
20.48 Codes/°C
==
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