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参数资料
| 型号： | MCP3421A5T-E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 29/30页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 3.75SPS SOT23-6 |
| 标准包装： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 3.75 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，单极 |
| 配用： | MCP3421EV-ND - BOARD EVAL FOR MCP3421 SOT23-6 |
| 其它名称： | MCP3421A5T-E/OTDKR |
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MCP3421
DS22003B-page 8
2006 Microchip Technology Inc.
The output codes will not roll-over if the input voltage
exceeds the maximum input range. In this case, the
code will be locked at 0111...11 for all voltages
greater than +(VREF - 1 LSB) and 1000...00 for
of output codes of various input levels using 18 bit
conversion mode. Table 4-3 shows an example of
minimum and maximum codes for each data rate
option.
The output code is given by:
EQUATION 4-1:
The LSB of the code is given by:
EQUATION 4-2:
TABLE 4-1:
LSB SIZE OF VARIOUS BIT
CONVERSION MODES
TABLE 4-2:
EXAMPLE OF OUTPUT CODE
FOR 18 BITS
TABLE 4-3:
MINIMUM AND MAXIMUM
CODES
4.6
Self-Calibration
The device performs a self-calibration of offset and
gain for each conversion. This provides reliable
conversion results from conversion-to-conversion over
variations in temperature as well as power supply
fluctuations.
4.7
Input Impedance
The MCP3421 uses a switched-capacitor input stage
using a 3.2 pF sampling capacitor. This capacitor is
switched (charged and discharged) at a rate of the
sampling frequency that is generated by the on-board
clock. The differential mode impedance varies with the
PGA settings. The typical differential input impedance
during a normal mode operation is given by:
Since the sampling capacitor is only switching to the
input pins during a conversion process, the above input
impedance is only valid during conversion periods. In a
low power standby mode, the above impedance is not
presented at the input pins. Therefore, only a leakage
current due to ESD diode is presented at the input pins.
The conversion accuracy can be affected by the input
signal source impedance when any external circuit is
connected to the input pins. The source impedance
adds to the internal impedance and directly affects the
time required to charge the internal sampling capacitor.
Therefore, a large input source impedance connected
to the input pins can increase the system performance
errors such as offset, gain, and integral nonlinearity
(INL) errors. Ideally, the input source impedance
should be zero. This can be achievable by using an
operational amplifier with a closed-loop output
impedance of tens of ohms.
Bit Resolutions
LSB (V)
12 bits
1 mV
14 bits
250 V
16 bits
62.5 V
18 bits
15.625 V
Input Voltage (V)
Digital Code
≥
VREF
011111111111111111
VREF - 1 LSB
011111111111111111
2LSB
000000000000000010
1LSB
000000000000000001
0
000000000000000000
-1 LSB
111111111111111111
-2 LSB
111111111111111110
- VREF
100000000000000000
< -VREF
100000000000000000
Output Code
Max Code 1
+
()
VIN+VIN-
–
()
2.048V
---------------------------------------
×
=
LSB
2 2.048V
×
2
N
--------------------------
=
Where:
N = the number of bits
Number
of Bits
Data Rate
Minimum
Code
Maximum
Code
12
240 SPS
-2048
2047
14
60 SPS
-8192
8191
16
15 SPS
-32768
32767
18
3.75 SPS
-131072
131071
Note:
Maximum n-bit code = 2n-1 - 1
Minimum n-bit code = -1 x 2n-1
ZIN(f) = 2.25 MΩ/PGA
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