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| 型号： | MCP3426A0-E/MC |
| 厂商： | Microchip Technology |
| 文件页数： | 3/56页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT I2C PROGBL 8-DFN |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 150 |
| 位数： | 16 |
| 采样率（每秒）： | 15 |
| 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： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（2x3） |
| 包装： | 管件 |
| 输入数目和类型： | 2 个差分，单极 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
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2009 Microchip Technology Inc.
DS22226A-page 11
MCP3426/7/8
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
Analog Inputs (CHn+, CHn-)
CHn+ and CHn- are differential input pins for
channel n. The user can also connect CHn- pin to VSS
for a single-ended operation. See Figure 6-4 for
differential and single-ended connection examples.
The maximum voltage range on each differential input
pin is from VSS-0.3V to VDD+0.3V. Any voltage below or
above this range will cause leakage currents through
the Electrostatic Discharge (ESD) diodes at the input
pins.
This ESD current can cause unexpected performance
of the device. The input voltage at the input pins should
be within the specified operating range defined in
and
See Section 4.5 “Input Voltage Range” for more
details of the input voltage range.
Figure 3-1 shows the input structure of the device. The
device uses a switched capacitor input stage at the
front end. CPIN is the package pin capacitance and
typically about 4 pF. D1 and D2 are the ESD diodes.
CSAMPLE is the differential input sampling capacitor.
3.2
Supply Voltage (VDD, VSS)
VDD is the power supply pin for the device. This pin
requires an appropriate bypass ceramic capacitor of
about 0.1 F to ground to attenuate high frequency
noise presented in application circuit board. An
additional 10 F capacitor (tantalum) in parallel is also
recommended to further attenuate current spike
noises. The supply voltage (VDD) must be maintained
in the 2.7V to 5.5V range for specified operation.
VSS is the ground pin and the current return path of the
device. The user must connect the VSS pin to a ground
plane through a low impedance connection. If an
analog ground path is available in the application PCB
(printed circuit board), it is highly recommended that
the VSS pin be tied to the analog ground path or
isolated within an analog ground plane of the circuit
board.
MCP3426
MCP3427
MCP3428
Sym
Function
DFN
MSOP,
SOIC
DFN
MSOP
SOIC,
TSSOP
1
CH1+
Positive Differential Analog Input Pin of Channel 1
2
CH1-
Negative Differential Analog Input Pin of Channel 1
7
4
3
CH2+
Positive Differential Analog Input Pin of Channel 2
8
5
4
CH2-
Negative Differential Analog Input Pin of Channel 2
66
3
5
VSS
Ground Pin
33
6
VDD
Positive Supply Voltage Pin
4
7
SDA
Bidirectional Serial Data Pin of the I2C Interface
5
8
SCL
Serial Clock Pin of the I2C Interface
——
9
Adr0
—
10
Adr1
—
11
CH3+
Positive Differential Analog Input Pin of Channel 3
—
12
CH3-
Negative Differential Analog Input Pin of Channel 3
—
13
CH4+
Positive Differential Analog Input Pin of Channel 4
—
14
CH4-
Negative Differential Analog Input Pin of Channel 4
9
—
11
—
EP
Exposed Thermal Pad (EP); must be connected to
VSS
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