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参数资料
| 型号： | ADS1225IRGVR |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| 中文描述： | 24位模拟数字转换器与单和双通道差分输入和内部振荡器 |
| 文件页数： | 10/24页 |
| 文件大小： | 398K |
| 代理商： | ADS1225IRGVR |
www.ti.com
OVERVIEW
The ADS1225 and ADS1226 are 24-bit delta-sigma
A/D converters.
Figure 19
shows a conceptual
diagram of the device. The ADS1225 has a single
channel, while the ADS1226 allows for one of two
input channels to be selected through a multiplexer.
A buffer can also be selected to increase the input
impedance. The modulator measures the differential
input signal V
IN
= (AINP – AINN) against the
differential reference V
REF
= (VREFP – VREFN). The
full-scale input range is
±
V
. A 2-wire serial
interface
indicates
conversion
provides the user with the output data. An internal
oscillator allows for free-running of the ADS1225 and
ADS1226.
ANALOG INPUTS (AINx+, AINx–)
The input signal to be measured is applied to the
input pins AINPx and AINNx. The positive internal
input is generalized as AINP, and the negative
internal input is generalized as AINN. The signal is
selected though the input MUX, which is controlled
by MUX, as shown in
Table 1
. The ADS1225 and
ADS1226 accept differential input signals, but can
also measure unipolar signals. When measuring
unipolar (or single-ended) signals with respect to
ground, connect the negative input (AINN) to ground
and connect the input signal to the positive input
(AINP). Note that when the ADS1225 and ADS1226
are configured this way, only half of the converter
full-scale range is used since only positive digital
output codes are produced. An input buffer can be
selected to increase the input impedance of the A/D
converter with the BUFEN pin.
MUX
Serial Interface
Oscillator
DS
ADC
VREFP VREFN
Buffer
MUX
ADS1226 Only
AINP1
AINN1
AINP
AINN
AINP2
AINN2
DRDY/DOUT
SCLK
TEMPEN
START
MODE
BUFEN
V
IN
S
S
V
REF
ADS1225
ADS1226
SBAS346–MAY 2006
completion
and
Two other pins are used to control the operation of
the ADS1225 and ADS1226. The START pin initiates
conversions. The MODE pin puts the device into one
of two modes. In High-Speed mode, the device gives
data
at
100
samples
High-Resolution mode, data comes out at 16SPS
with lower noise. In both modes, the device has
single-cycle settling, reducing the latency of the
output data.
Table 1. Input Channel Selection with MUX
per
second
(SPS).
In
DIGITAL PIN
MUX
0
1
SELECTED ANALOG INPUTS
POSITIVE INPUT
AINP1
AINP2
NEGATIVE INPUT
AINN1
AINN2
Figure 19. Conceptual Diagram of the ADS1225 and ADS1226
10
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| ADS1225IRGVRG4 | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
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| ADS1226 | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1225IRGVRG4 | 功能描述:模数转换器 - ADC 24-Bit 100SPS ADC 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 |
| ADS1225IRGVT | 功能描述:模数转换器 - ADC 24-Bit 100SPS ADC 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 |
| ADS1225IRGVT | 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC |
| ADS1225IRGVTG4 | 功能描述:模数转换器 - ADC 24-Bit 100SPS ADC 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 |
| ADS1226 | 制造商:AD 制造商全称:Analog Devices 功能描述:24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
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