- 您现在的位置：买卖IC网 > PDF目录10735 > MCP3421A2T-E/CH (Microchip Technology)IC ADC 18BIT 3.75SPS 1CH SOT23-6 PDF资料下载
参数资料
| 型号： | MCP3421A2T-E/CH |
| 厂商： | Microchip Technology |
| 文件页数： | 3/42页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 3.75SPS 1CH SOT23-6 |
| 产品培训模块： | MCP3901 Analog Front End |
| 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 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 其它名称： | MCP3421A2T-E/CHDKR |
第1页第2页当前第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页
2009 Microchip Technology Inc.
DS22003E-page 11
MCP3421
4.0
DESCRIPTION OF DEVICE
OPERATION
4.1
General Overview
The MCP3421 is a low-power, 18-Bit Delta-Sigma A/D
converter with an I2C serial interface. The device
contains an on-board voltage reference (2.048V),
programmable gain amplifier (PGA), and internal
oscillator. When the device powers up (POR is set), it
automatically resets the configuration bits to default
settings.
Device default settings are:
Conversion bit resolution: 12 bits (240 sps)
PGA gain setting: x1
Continuous conversion
Once the device is powered-up, the user can
reprogram the configuration bits using I2C serial
interface any time. The configuration bits are stored in
volatile memory.
User selectable options are:
Conversion bit resolution: 12, 14, 16, or 18 bits
PGA Gain selection: x1, x2, x4, or x8
Continuous or one-shot conversion
In the Continuous Conversion mode, the device
converts the inputs continuously. While in the One-Shot
Conversion mode, the device converts the input one
time and stays in the low-power standby mode until it
receives another command for a new conversion.
During the standby mode, the device consumes less
than 1 A maximum.
4.2
Power-On-Reset (POR)
The device contains an internal Power-On-Reset
(POR) circuit that monitors power supply voltage (VDD)
during operation. This circuit ensures correct device
start-up at system power-up and power-down events.
The POR has built-in hysteresis and a timer to give a
high degree of immunity to potential ripples and noises
on the power supply. A 0.1 F decoupling capacitor
should be mounted as close as possible to the VDD pin
for additional transient immunity.
The threshold voltage is set at 2.2V with a tolerance of
approximately ±5%. If the supply voltage falls below
this threshold, the device will be held in a reset
condition. The typical hysteresis value is approximately
200 mV.
The POR circuit is shut-down during the low-power
standby mode. Once a power-up event has occurred,
the
device
requires
additional
delay
time
(approximately 300 s) before a conversion can take
place. During this time, all internal analog circuitries are
settled before the first conversion occurs. Figure 4-1
illustrates the conditions for power-up and power-down
events under typical start-up conditions.
When the device powers up, it automatically resets
and sets the configuration bits to default settings. The
default configuration bit conditions are a PGA gain of
1 V/V and a conversion speed of 240 SPS in
Continuous Conversion mode. When the device
receives an I2C General Call Reset command, it
performs an internal reset similar to a Power-On-Reset
event.
FIGURE 4-1:
POR Operation.
4.3
Internal Voltage Reference
The device contains an on-board 2.048V voltage
reference. This reference voltage is for internal use
only and not directly measurable. The specifications of
the reference voltage are part of the device’s gain and
drift specifications. Therefore, there is no separate
specification for the on-board reference.
4.4
Analog Input Channel
The differential analog input channel has a switched
capacitor structure. The internal sampling capacitor
(3.2 pF for PGA = 1) is charged and discharged to
process a conversion. The charging and discharging of
the input sampling capacitor creates dynamic input
currents at each input pin. The current is a function of
the
differential
input
voltages,
and
inversely
proportional to the internal sampling capacitance,
sampling frequency, and PGA setting.
VDD
2.2V
2.0V
300 S
Reset Start-up
Normal Operation
Reset
Time
相关PDF资料 |
PDF描述 |
|---|---|
| B37937K9561J60 | CAP CER 560PF 16V 5% NP0 0603 |
| MCP3421A1T-E/CH | IC ADC 18BIT 3.75SPS 1CH SOT23-6 |
| MCP3421A3T-E/CH | IC ADC 18BIT 3.75SPS 1CH SOT23-6 |
| ADCMP581BCPZ-WP | IC COMPARATOR ECL UFAST 16-LFCSP |
| ADCMP582BCPZ-WP | IC COMPARATOR PECL UFAST 16LFCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP3421A3T-E/CH | 功能描述:模数转换器 - ADC 18-B delta-sigma ADC Sngl Ch 4sps RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3421A3T-E/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference |
| MCP3421A4T-E/CH | 制造商:Microchip Technology Inc 功能描述:ANALOG-TO-DIGITAL CONVERTER WITH 18-BIT 制造商:Microchip Technology Inc 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE CHANNEL, 4SPS - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC ADC 18BIT I2C 4SPS SOT23-6 制造商:Microchip Technology Inc 功能描述:18-bit delta-sigma ADC, single channel, 4sps, 6 SOT-23 T/R |
| MCP3421A4T-E/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference |
| MCP3421A5T-E/CH | 制造商:Microchip Technology 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE 制造商:Microchip Technology Inc 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE CHANNEL, 4SPS - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC ADC 18BIT I2C 4SPS SOT23-6 |
发布紧急采购，3分钟左右您将得到回复。