- 您现在的位置：买卖IC网 > PDF目录165354 > ADS7945SRTET (TEXAS INSTRUMENTS INC) 2-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC16 PDF资料下载
参数资料
| 型号： | ADS7945SRTET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 24/49页 |
| 文件大小： | 1322K |
| 代理商： | ADS7945SRTET |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页当前第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页
1
2
14
15
16
17
27
28
29
30
31
32
SCLK
CS
SDO
t
ACQ
t
CONV
D13
18
Power-DownState
(Internal)
I
DYNAMIC
IPD
DYNAMIC
IPD
.
STATIC
DYNAMIC
if
SCLKisoff,
otherwise
IPD
I
Profile
AVDD
t
ACQ(MIN)+
1 s
m
I
STATIC
D12
D3
D2
D1
D0
SBAS539B
– JUNE 2011 – REVISED SEPTEMBER 2011
CS can be held low past the 16th falling edge of SCLK. The devices continue to output recently converted data
starting with the 16th SCLK falling edge. If CS is held low until the 30th SCLK falling edge, then the devices
detect 32-clock mode. Note that the device data from recent conversions are already output with no latency
before the 30th SCLK falling edge. Once 32-clock mode is detected, the device outputs 16 zeros during the next
conversion (in fact, for the first 16 clocks), unlike 16-clock mode where the devices output the previous
conversion result. SCLK can be stopped after the devices have seen the 30th falling edge with CS low.
CONVERSION ABORT
For some event triggered applications such as latching position of absolute position sensor on marker or homing
pulse, it is essential to abort ongoing conversion on event and quickly start fresh acquisition. ADS794X features
conversion abort function. CS high during conversion (during first 16 clocks) will abort ongoing conversion and
start fresh acquisition. Device will sample acquired signal during CS high period on falling edge of CS and will
start conversion normally, however data on SDO (conversion results from aborted frame) will not be valid.
For example if conversion is aborted during
‘nth’ frame and (n+1) is first valid frame after conversion abort. SDO
data during frame number (n+1) (corresponding to nth conversion) will not be valid. Conversion results for sample
and conversion during frame number (n+1) will be available in frame number (n+2).
POWER-DOWN
The ADS7945/6 devices offer an easy-to-use power-down feature available through a dedicated PDEN pin (pin
12). A high level on PDEN at the CS rising edge enables the power-down mode for that particular cycle.
Figure 83 to Figure 85 illustrate device operation with power-down in both 32-clock and 16-clock mode.
Many applications must slow device operation. For speeds below approximately 500 kSPS, it is convenient to
use 32-clock mode with power-down. This configuration results in considerable power savings.
As shown in Figure 83, PDEN is held at a logic '1' level. Note that the device looks at the PDEN status only at
the CS rising edge; however, for continuous low-speed operation, it is convenient to continuously hold PDEN = 1.
The devices detect power-down mode on the CS rising edge with PDEN = 1.
Figure 83. Operation with a 32-Clock Frame in Power-Down Mode (PDEN = 1)
On the CS falling edge, the devices start normal operation as previously described. The devices complete
conversions on the 16th SCLK falling edge. The devices enter the power-down state immediately after
30
Copyright
2011, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| ADS7953SBRHBT | 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32 |
| ADS7953SRHBT | 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32 |
| ADS803E | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| ADS8342IBPFBTG4 | 4-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
| ADS8412IPFBTG4 | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS7946 | 制造商:TI 制造商全称:Texas Instruments 功能描述:14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power Analog-to-Digital Converters |
| ADS7946EVM-PDK | 功能描述:数据转换 IC 开发工具 ADS7946 PERF DEM KIT 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 |
| ADS7946SRTER | 功能描述:模数转换器 - ADC 14B,2MSPS,DUAL-CH, UNIP,PSE-DIF,SAR 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 |
| ADS7946SRTET | 功能描述:模数转换器 - ADC 14B,2MSPS,DUAL-CH, UNIP,PSE-DIF,SAR 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 |
| ADS7947 | 制造商:TI 制造商全称:Texas Instruments 功能描述:12/10/8-Bit 2MSPS, Dual-Channel Unipolar Pseudo-Differential Ultralow-Power SAR Analog-to-Digital Converters |
发布紧急采购，3分钟左右您将得到回复。