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| 型号： | ADS1225IRGVT |
| 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： | 16/24页 |
| 文件大小： | 398K |
| 代理商： | ADS1225IRGVT |
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SELF-CALIBRATION
Self-calibration can be initiated at any time, although
in many applications the ADS1225 and ADS1226
drift performance is so good that the self-calibration
performed automatically at power-up is all that is
needed. To initiate self-calibration, apply at least two
additional SCLKs after retrieving 24 bits of data.
Figure 30
and
Table 6
illustrate the timing pattern.
The 25th SCLK will send DRDY/DOUT high. The
falling edge of the 26th SCLK will begin the
calibration cycle. Additional SCLK pulses may be
sent after the 26th SCLK; however, activity on SCLK
should be minimized during calibration for best
results.
23
DRDY/DOUT
SCLK
1
24
t
CAL
25
26
23
22
21
0
Data Ready After Calibration
Calibration Begins
ADS1225
ADS1226
SBAS346–MAY 2006
When the calibration is complete, DRDY/DOUT goes
low, indicating that new data is ready. There is no
need to alter the analog input signal applied to the
ADS1225 and ADS1226 during calibration; the input
pins are disconnected within the A/D converter and
the appropriate signals are applied internally and
automatically. The first conversion after a calibration
is fully settled and valid for use. The time required for
a calibration depends on two independent signals:
the falling edge of SCLK and an internal clock
derived
from
CLK.
Variations
calibration values change the time required for
calibration (t
8
) within the range given by the min/max
specs. t
and t
12
described in the next section are
affected likewise.
in
the
internal
Figure 30. Self-Calibration Timing
Table 6. Self-Calibration Time for
Figure 30
SYMBOL
t
CAL
DESCRIPTION
First data ready after calibration
MIN
187
MAX
313
UNITS
ms
16
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相关PDF资料 |
PDF描述 |
|---|---|
| ADS1225IRGVTG4 | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| ADS1226 | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| ADS1226IRGVR | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| ADS1226IRGVRG4 | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| ADS1226IRGVT | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ADS1226IRGVR | 功能描述:模数转换器 - ADC 24-Bit 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 |
| ADS1226IRGVRG4 | 功能描述:模数转换器 - ADC 24-Bit 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 |
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