參數(shù)資料
型號(hào)： ADS1256IDB
英文描述： Very Low Noise, 24-Bit Analog-to-Digital Converter
中文描述： 極低噪聲，24位模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù)： 14/39頁
文件大小： 427K
代理商： ADS1256IDB
SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
14
INPUT MULTIPLEXER
Figure 6 shows a simplified diagram of the input
multiplexer. This flexible block allows any analog input pin
to be connected to either of the converter differential
inputs. That is, any pin can be selected as the positive
input (AIN
P
); likewise, any pin can be selected as the
negative input (AIN
N
). The pin selection is controlled by
the multiplexer register.
The ADS1256 offers nine analog inputs, which can be
configured as four independent differential inputs, eight
single-ended inputs, or a combination of differential and
single-ended inputs.
The ADS1255 offers three analog inputs, which can be
configured as one differential input or two single-ended
inputs. When using the ADS1255 and programming the
input, make sure to select only the available inputs when
programming the input multiplexer register.
In general, there are no restrictions on input pin selection.
However, for optimum analog performance, the following
recommendations are made:
1.
For differential measurements use AIN0 through
AIN7, preferably adjacent inputs. For example, use
AIN0 and AIN1. Do not use AINCOM.
For single-ended measurements use AINCOM as
common input and AIN0 through AIN7 as
single-ended inputs.
Leave any unused analog inputs floating. This
minimizes the input leakage current.
ESD diodes protect the analog inputs. To keep these
diodes from turning on, make sure the voltages on the
input pins do not go below AGND by more than 100mV,
and likewise do not exceed AVDD by more than 100mV:
100mV < (AIN0 7 and AINCOM) < AVDD + 100mV.
When using ADS1255/6 for single-ended measurements,
it is important to note that common input AINCOM does not
need to be tied to ground. For example, AINCOM can be
tied to a midpoint reference such as +2.5V or even AVDD.
2.
3.
AIN3
AIN4
AIN5
AIN6
AIN0
AIN1
AIN2
AIN7
AINCOM
Sensor Detect
Current
Source
Sensor Detect
Current
Source
Input Multiplexer
Input
Buffer
AGND
AIN
N
AIN
P
AVDD
AVDD AGND
ADS1256 Only
AVDD
AVDD
AVDD
AVDD
AVDD
AVDD
AVDD
AVDD
Figure 6. Simplified Diagram of the Input Multiplexer
相關(guān)PDF資料
PDF描述
ADS1256IDBR Very Low Noise, 24-Bit Analog-to-Digital Converter
ADS1256IDBT Very Low Noise, 24-Bit Analog-to-Digital Converter
ADS1255 Very Low Noise, 24-Bit Analog-to-Digital Converter
ADS1256 Very Low Noise, 24-Bit Analog-to-Digital Converter
ADS1271 24 BIT WIDE BANDWIDTH ANALOG TO DIGITAL CONVERTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1256IDBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma 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
ADS1256IDBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma 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
ADS1256IDBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma 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
ADS1256IDBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma 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
ADS1257IRGWR 功能描述:ANALOG TO DIGITAL CONVERTERS - A 制造商:texas instruments 系列:* 包裝:帶卷（TR） 零件狀態(tài):在售 封裝/外殼:20-VQFN 裸露焊盤 供應(yīng)商器件封裝:20-VQFN（5x5） 標(biāo)準(zhǔn)包裝:3,000
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