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參數(shù)資料
| 型號： | ADS7830IPWT |
| 英文描述： | 8-Bit, 8-Channel Sampling ANALOG-TO-DIGITAL CONVERTER with I2C⑩ Interface |
| 中文描述： | 8位，8通道采樣模擬到數(shù)字轉(zhuǎn)換接口的I2C⑩ |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 251K |
| 代理商： | ADS7830IPWT |
ADS7830
SBAS302
9
www.ti.com
FIGURE 1. Simplified I/O of the ADS7830.
THEORY OF OPERATION
The ADS7830 is a classic Successive Approximation Regis-
ter (SAR) A/D converter. The architecture is based on ca-
pacitive redistribution which inherently includes a sample-
and-hold function. The converter is fabricated on a 0.6
μ
CMOS process.
The ADS7830 core is controlled by an internally generated
free-running clock. When the ADS7830 is not performing
conversions or being addressed, it keeps the A/D converter
core powered off, and the internal clock does not operate.
The simplified diagram of input and output for the ADS7830
is shown in Figure 1.
ANALOG INPUT
When the converter enters the hold mode, the voltage on the
selected CHx pin is captured on the internal capacitor array.
The input current on the analog inputs depends on the
conversion rate of the device. During the sample period, the
source must charge the internal sampling capacitor (typically
25pF). After the capacitor has been fully charged, there is no
further input current. The amount of charge transfer from the
analog source to the converter is a function of conversion rate.
REFERENCE
The ADS7830 can operate with its internal 2.5V reference or
an external reference. When using a +2.7V supply, the
internal 2.5V reference will provide full dynamic range for a
0V to +V
DD
analog input. If a +5V supply is used, an external
5V reference is required in order to provide full dynamic
range for a 0V to +V
DD
analog input. This external reference
can be as low as 50mV.
As the reference voltage is reduced, the analog voltage
weight of each digital output code is reduced. This is often
referred to as the LSB (least significant bit) size and is equal
to the reference voltage divided by 256. This means that any
offset or gain error inherent in the A/D converter will appear
to increase, in terms of LSB size, as the reference voltage is
reduced.
The noise inherent in the converter will also appear to increase
with lower LSB size. With a 2.5V reference, the internal noise
of the converter typically contributes only 0.02LSB peak-to-
peak of potential error to the output code. When the external
reference is 50mV, the potential error contribution from the
internal noise will be 50 times larger
—
1LSB. The errors due to
the internal noise are Gaussian in nature and can be reduced
by averaging consecutive conversion results.
DIGITAL INTERFACE
The ADS7830 supports the I
2
C serial bus and data transmis-
sion protocol, in all three defined modes: standard, fast, and
high-speed. A device that sends data onto the bus is defined
as a transmitter, and a device receiving data as a receiver.
The device that controls the message is called a
“
master.
”
The devices that are controlled by the master are
“
slaves.
”
The bus must be controlled by a master device that gener-
ates the serial clock (SCL), controls the bus access, and
generates the START and STOP conditions. The ADS7830
operates as a slave on the I
2
C bus. Connections to the bus
are made via the open-drain I/O lines SDA and SCL.
Microcontroller
+2.7V to +3.6V
1
μ
F to
10
μ
F
+
2k
2k
5
1
μ
F to
10
μ
F
+
0.1
μ
F
ADS7828
REF
IN
/
REF
OUT
CH0
V
DD
SDA
SCL
A0
A1
GND
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7830IPWT | 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC |
| ADS7830IPWTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 8-Ch Sampling w/I2C Interface 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7831 | 制造商:BB 制造商全稱:BB 功能描述:12-Bit 600kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| ADS7831 WAF | 制造商:Texas Instruments 功能描述: |
| ADS7831P | 制造商:Rochester Electronics LLC 功能描述:12-BIT, 600KHZ,SAMPLING A/D - Bulk |
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