參數(shù)資料
型號(hào)： MCP3550T-50E/MS
廠商： Microchip Technology
文件頁(yè)數(shù)： 10/36頁(yè)
文件大?。?/td> 0K
描述： IC ADC 22BIT 2.7V 1CH 8MSOP
產(chǎn)品培訓(xùn)模塊： MCP3901 Analog Front End
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 22
采樣率（每秒）： 12.5
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 單電源
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-MSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)差分，單極
配用： MCP355XDV-MS1-ND - BOARD DEV SENSOR APP MCP355X
MCP355XDM-TAS-ND - BOARD DEMO TINY APP SNSR MCP355X
MCP3550/1/3
DS21950E-page 18
2009 Microchip Technology Inc.
4.4
Differential Analog Inputs
The MCP3550/1/3 devices accept a fully differential
analog input voltage to be connected to the VIN+ and
VIN- input pins. The differential voltage that is converted
is defined by VIN = VIN+ – VIN-. The differential voltage
range specified for ensured accuracy is from -VREF to
+VREF.
The converter will output valid and usable codes from
-112% to 112% of output range (see Section 5.0
“Serial Interface”) at room temperature. The ±12%
overrange is clearly specified by two overload bits in
the output code: OVH and OVL. This feature allows for
system calibration of a positive gain error.
The absolute voltage range on these input pins extends
from VSS - 0.3V to VDD + 0.3V. If the input voltages are
above or below this range, the leakage currents of the
ESD diodes will increase exponentially, degrading the
accuracy and noise performance of the converter. The
common mode of the analog inputs should be chosen
such that both the differential analog input range and
absolute voltage range on each pin are within the
specified operating range defined in Section 1.0
Both the analog differential inputs and the reference
input have switched-capacitor input structures. The
input
capacitors
are
charged
and
discharged
alternatively with the input and the reference in order to
process a conversion. The charge and discharge of the
input capacitors create dynamic input currents at the
VIN+ and VIN- input pins inversely proportional to the
sampling capacitor. This current is a function of the
differential input voltages and their respective common
modes. The typical value of the differential input
impedance is 2.4 M, with VCM = 2.5V, VDD = VREF =
5V. The DC leakage current caused by the ESD input
diodes, even though on the order of 1 nA, can cause
additional offset errors proportional to the source
resistance at the VIN+ and VIN- input pins.
From a transient response standpoint and as a first-
order approximation, these input structures form a
simple RC filtering circuit with the source impedance in
series with the RON (switched resistance when closed)
of the input switch and the sampling capacitor. In order
to ensure the accuracy of the sampled charge, proper
settling time of the input circuit has to be considered.
Slow settling of the input circuit will create additional
gain error. As a rule of thumb, in order to obtain 1 ppm
absolute measurement accuracy, the sampling period
must be 14 times greater than the input circuit RC time
constant.
4.5
Voltage Reference Input Pin
The MCP3550/1/3 devices accept a single-ended
external reference voltage, to be connected on the
VREF input pin. Internally, the reference voltage for the
ADC is a differential voltage with the non-inverting input
connected to the VREF pin and the inverting input
connected to the VSS pin. The value of the reference
voltage is VREF - VSS and the common mode of the
reference is always (VREF - VSS)/2.
The MCP3550/1/3 devices accept a single-ended
reference voltage from 0.1V to VDD. The converter
output noise is dominated by thermal noise that is
independent of the reference voltage. Therefore, the
output noise is not significantly improved by lowering
the reference voltage at the VREF input pin. However, a
reduced reference voltage will significantly improve the
INL performance since the INL max error is
proportional to VREF2 (see Figure 2-4).
The charge and discharge of the input capacitor create
dynamic input currents at the VREF input pin inversely
proportional to the sampling capacitor, which is a func-
tion of the input reference voltage. The typical value of
the single-ended input impedance is 2.4 M, with
VDD =VREF = 5V. The DC leakage current caused by
the ESD input diodes, though on the order of 1 nA
typically, can cause additional gain error proportional to
the source resistance at the VREF pin.
4.6
Power-On Reset (POR)
The MCP3550/1/3 devices contain 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
ripple and noise on the power supplies, as well as to
allow proper settling of the power supply during power-
up. A 0.1 F decoupling capacitor should be mounted
as close as possible to the VDD pin, providing 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 MCP3550/1/3 devices will be held in
a reset condition or in Shutdown mode. When the part
is in Shutdown mode, the power consumption is less
than 1 A. The typical hysteresis value is around
200 mV in order to prevent reset during brown-out or
other glitches on the power supply.
相關(guān)PDF資料
PDF描述
MCP3553T-E/MS IC ADC 22BIT 2.7V 1CH SPI 8MSOP
MS27466T11B98P CONN RCPT 6POS WALL MT W/PINS
VE-B4V-IV-F1 CONVERTER MOD DC/DC 5.8V 150W
MCP3551T-E/MS IC ADC 22BIT 2.7V 1CH SPI 8MSOP
MS27466T9F98S CONN RCPT 3POS WALL MT W/SCKT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3550T-60 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
MCP3550T-60E/MS 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 22-bit ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MCP3550T-60-E/MS 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
MCP3550T-60E/SN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 22-bit ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MCP3550T-60-E/SN 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*