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參數(shù)資料
| 型號(hào)： | ADS1222IPWT |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 24BIT ADC W/2CH MUX 14-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Basics |
| 視頻文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 240 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 2.25mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 4 個(gè)單端，單極；2 個(gè)差分，雙極 |
| 其它名稱： | 296-17321-6 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit Conv w/2-Ch Diff Input Mltplxer 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 |
| ADS1224 | 制造商:BB 制造商全稱:BB 功能描述:24-Bit Analog-to-Digital Converter with 4-Channel Differential Input Multiplexer |
| ADS1224EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1224 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS1224IPWR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-bit 240SPS 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 |
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