- 您现在的位置：买卖IC网 > PDF目录378586 > DS1244 Low-Power, 24-Bit ANALOG-TO-DIGITAL CONVERTER PDF资料下载
参数资料
| 型号： | DS1244 |
| 英文描述： | Low-Power, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 256k NV SRAM，带有隐含时钟 |
| 文件页数： | 13/19页 |
| 文件大小： | 292K |
| 代理商： | DS1244 |
ADS1244
SBAS273
13
www.ti.com
SLEEP MODE
Sleep Mode dramatically reduces power consumption (typi-
cally < 1
μ
W with CLK stopped) by shutting down all of the
active circuitry. To enter Sleep Mode, simply hold SCLK
HIGH after
DRDY/DOUT
goes LOW, as shown in Figure 15.
Sleep Mode can be initiated at any time during read back; it
is not necessary to retrieve all 24 bits of data beforehand.
Once t
11
has passed with SCLK held HIGH, Sleep Mode will
activate.
DRDY/DOUT
stays HIGH once Sleep Mode begins.
SCLK must remain HIGH to stay in Sleep Mode. To exit
Sleep Mode (
“
wakeup
”
), set SCLK LOW. The first data after
exiting Sleep Mode is valid. It is not necessary to stop CLK
during Sleep Mode, but doing so will further reduce the digital
supply current.
Sleep Mode With Self-Calibration
Self-calibration can be set to run immediately after exiting
Sleep Mode. This is useful when the ADS1244 is put in Sleep
Mode for long periods of time and self-calibration is desired
afterwards to compensate for temperature or supply voltage
changes.
FIGURE 16. Sleep Mode with Self-Calibration on Wakeup Timing; Can be Used for Single Conversions.
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
t
13(1)
Data ready after wakeup and calibration.
210
211
ms
NOTE: (1) Values given for f
CLK
= 2.4576MHz. For different CLK frequencies, scale proportional to CLK
period.
Sleep Mode
Wakeup and begin cal.
Data ready after wakeup and cal.
t
11
t
13
DRDY/DOUT
23
1
24
25
22
21
0
23
SCLK
To force a self-calibration with Sleep Mode, shift 25 bits out
before taking SCLK HIGH to enter Sleep Mode. Self-calibra-
tion will then begin after wakeup. Figure 16 shows the
appropriate timing. Note the extra time needed after wakeup
for calibration before data is ready. The first data after Sleep
Mode with self-calibration is fully-settled and can be used.
SINGLE CONVERSIONS
When only single conversions are needed, Sleep Mode can
be used to start and stop the ADS1244. To make a single
conversion, first enter the Sleep Mode holding SCLK HIGH.
Now, when ready to start the conversion, take SCLK LOW.
The ADS1244 will wake up and begin the conversion. Wait
for
DRDY/DOUT
to go LOW, and then retrieve the data.
Afterwards, take SCLK HIGH to stop the ADS1244 from
converting and re-enter Sleep Mode. Continue to hold SCLK
HIGH until ready to start the next conversion. Operating in
this fashion greatly reduces power consumption since the
ADS1244 is shut down while idle between conversions. Self-
calibrations can be performed prior to the start of the single
conversions by using the waveform shown in Figure 16.
FIGURE 15. Sleep Mode Timing; Can be Used for Single Conversions.
DRDY/DOUT
23
22
21
1
24
0
23
SCLK
Sleep Mode
Wakeup
Data ready after wakeup.
t
10
t
11
t
12
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
t
10(1)
SCLK HIGH after
DRDY/DOUT
goes LOW to activate
Sleep Mode.
Sleep Mode activation Time.
Data ready after wakeup.
0
63.7
ms
t
11(1)
t
12(1)
66.5
71
66.5
72
ms
ms
NOTE: (1) Values given for f
CLK
= 2.4576MHz. For different CLK frequencies, scale proportional to CLK
period.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1248 | 1024k NV SRAM with Phantom Clock |
| DS1248P | 1024k NV SRAM with Phantom Clock |
| DS1248WP120IND | 1024k NV SRAM with Phantom Clock |
| DS1248Y70IND | 1024k NV SRAM with Phantom Clock |
| DS1248YP70IND | 1024k NV SRAM with Phantom Clock |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1244P | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:256k NV SRAM with Phantom Clock |
| DS1244W-120 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1244W-120+ | 功能描述:实时时钟 256k NV SRAM w/Phantom Clock RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1244W-120IND | 功能描述:IC NVSRAM 256KBIT 120NS 28DIP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1244W-120IND+ | 功能描述:实时时钟 256k NV SRAM w/Phantom Clock RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。