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參數(shù)資料
| 型號(hào)： | ADS1245IDGSR |
| 英文描述： | Low-Power, 24-Bit Analog-to-Digital Converter |
| 中文描述： | 低功耗，24位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大?。?/td> | 254K |
| 代理商： | ADS1245IDGSR |
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SBAS287A JUNE 2003 REVISED SEPTEMBER 2003
www.ti.com
10
Begin New Conversion,
Complete Previous Conversion
New Conversion Complete
t
DELAY
DRDY/DOUT
V
IN
Previous Conversion Data
Figure 22. Analog Input Change Timing
POWERUP
Self-calibration is performed at power-up to minimize offset
and gain errors. In order for the self-calibration at power-up to
work properly, make sure that both AVDD and DVDD increase
monotonically and are settled by t
1
,
as shown in Figure 23.
SCLK must be held low during this time. Once calibration
is complete, DRDY/DOUT goes low, indicating data is
ready for retrieval. The time required before the first data
is ready (t
6
) depends on how fast AVDD and DVDD ramp
to their final value (t
1
). For most ramp rates, t
1
+
t
2
≈
350ms
(f
CLK
= 2.4576MHz). If the system environment is not stable
during power-up (the temperature is varying or the supply
voltages are moving around), it is recommended that a
self-calibration be issued after everything is stable.
AVDD and DVDD
DRDY/DOUT
SCLK
t
1
t
2
Data ready after powerup calibration.
SYMBOL DESCRIPTION
t
1
(1)
t
2
(1)
Wait time for calibration and first data
conversion.
MIN MAX UNITS
316
100
ms
ms
NOTE: (1) Values given for f
= 2.4576MHz. For different CLK frequencies,
scale proportional to CLK period.
AVDD and DVDD settling time.
Figure 23. Power-Up Timing
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1245IDGSRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-bit Low-Power w/Hi-Z Input Buffer 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 |
| ADS1245IDGST | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-bit Low-Power w/Hi-Z Input Buffer 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 |
| ADS1245IDGST | 制造商:Texas Instruments 功能描述:IC 24-BIT ADC HIGH-Z I/P BUFFER |
| ADS1245IDGSTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-bit Low-Power w/Hi-Z Input Buffer 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 |
| ADS1246 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:24-Bit Analog-to-Digital Converters for Temperature Sensors |
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