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| 型号： | ADS1222IPWT |
| 厂商： | Texas Instruments |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC 24BIT ADC W/2CH MUX 14-TSSOP |
| 产品培训模块： | Data Converter Basics |
| 视频文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 标准包装： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 240 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 标准包装 |
| 输入数目和类型： | 4 个单端，单极；2 个差分，双极 |
| 其它名称： | 296-17321-6 |
ADS1222
SBAS314B APRIL 2004 REVISED JANUARY 2009
www.ti.com
18
MULTICHANNEL SYSTEMS
Multiple ADS1222s can be operated in parallel to
measure multiple input signals. Figure 31 shows an
example of a four-channel system. For simplicity, the
supplies and reference circuitry are not shown. The
same CLK signal should be applied to all devices. To
synchronize the ADS1222s, connect the same SCLK
signal to all devices. Then place all the devices in
Standby mode. Afterwards, starting a conversion will
synchronize all the ADS1222s; that is, they will sample
the input signals simultaneously. The DRDY/DOUT
outputs will go low at approximately the same time after
synchronization. When reading data from the devices,
the data appears in parallel on DRDY/DOUT as a result
of the common SCLK connection.
The falling edges of DRDY/DOUT, indicating that new
data is ready, will vary with respect to each other no
more than time t13. This variation is due to possible
differences in the ADS1222 internal calibration settings.
To account for this, when using multiple devices, either
wait for t13 to pass after seeing one DRDY/DOUT go
low, or wait until all DRDY/DOUTs have gone low before
retrieving data.
Note that changing channels (using the MUX pin), or
using the input buffer (BUFEN) or the temperature
sensor (TEMPEN), may require more care to settle the
digital filter. For example, if the MUX pin is toggled on
one device and not the other, the DRDY/DOUT line will
be held high until the conversion settles on the first
device. The latter device will continue conversions
through this time. See the Settling Time section of this
datasheet for further details.
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
t13(1)
Difference between DRDY/DOUTs going low in multichannel
±0.8
ms
systems
(1) Values given for fCLK = 2MHz. For different fCLK frequencies, scale proportional to CLK period.
CLK
SCLK
DRDY/DOUT
AINP1
AINN1
AINP4
AINN4
MUX
ADS1222
MUX Select
Inputs
OUT1
CLK and SCLK
Sources
OUT1
OUT2
t
13
…
CLK
SCLK
DRDY/DOUT
AINP1
AINN1
AINP4
AINN4
MUX
ADS1222
MUX Select
Inputs
OUT2
…
Figure 31. Example of Using Multiple ADS1222s in Parallel
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1222IPWT | 制造商:Texas Instruments 功能描述:IC 24-BIT ADC 2 CH DIFF I/P MULTI |
| ADS1222IPWTG4 | 功能描述:模数转换器 - ADC 24-Bit Conv w/2-Ch Diff Input Mltplxer 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 |
| ADS1224 | 制造商:BB 制造商全称:BB 功能描述:24-Bit Analog-to-Digital Converter with 4-Channel Differential Input Multiplexer |
| ADS1224EVM | 功能描述:数据转换 IC 开发工具 ADS1224 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ADS1224IPWR | 功能描述:模数转换器 - ADC 24-bit 240SPS 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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