参数资料
型号: EVAL-AD7944EBZ
厂商: Analog Devices Inc
文件页数: 11/28页
文件大小: 0K
描述: BOARD EVAL FOR AD7944
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 14
采样率(每秒): 2.5M
数据接口: SPI?、QSPI?、MICROWIRE? 和 DSP
输入范围: 0 ~ 5 V
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7944
已供物品:
AD7944
Rev. A | Page 19 of 28
CS MODE, 3-WIRE WITHOUT BUSY INDICATOR
This mode is usually used when a single AD7944 is connected
to an SPI-compatible digital host. The connection diagram is
shown in Figure 26, and the corresponding timing is given in
With SDI tied to VIO, a rising edge on CNV initiates a con-
version, selects CS mode, and forces SDO to high impedance.
When a conversion is initiated, it continues until completion,
irrespective of the state of CNV. This can be useful, for example,
to bring CNV low to select other SPI devices, such as analog
multiplexers; however, CNV must be returned high before the
minimum conversion time elapses and then held high for the
maximum possible conversion time to avoid the generation of
the busy signal indicator.
When the conversion is complete, the AD7944 enters the
acquisition phase and, if the part is in normal mode (TURBO
low), powers down. When CNV goes low, the MSB is output
onto SDO. The remaining data bits are clocked by subsequent
SCK falling edges. The data is valid on both SCK edges. Although
the rising edge can be used to capture the data, a digital host
using the SCK falling edge allows a faster reading rate, provided
that it has an acceptable hold time. After the 14th SCK falling
edge or when CNV goes high (whichever occurs first), SDO
returns to high impedance.
AD7944
SDI
SDO
CNV
SCK
CONVERT
DATA IN
CLK
DIGITAL HOST
VIO
04658-
009
Figure 26. CS Mode, 3-Wire Without Busy Indicator Connection Diagram (SDI High)
ACQUISITION (n)
ACQUISITION
(n + 1)
ACQUISITION
(n – 1)
1
2
BEGIN DATA (n – 1)
CONVERSION (n)
END DATA (n – 1)
SCK
CNV
SDO
12
13
CONVERSION (n – 1)
END DATA (n – 2)
tCONV
tDATA
0
(I/O QUIET
TIME)
(I/O QUIET
TIME)
14
12
13
14
1
13
12
11
2
0
1
2
SDI = 1
>
tCONV
(I/O QUIET
TIME)
tCYC
tACQ
tCNVH
tQUIET
tSCK
tDIS
tEN
tDSDO
tHSDO
tDATA
tCONV
04658-
010
Figure 27. CS Mode, 3-Wire Without Busy Indicator Serial Interface Timing (SDI High)
相关PDF资料
PDF描述
RBC19DRYH-S13 CONN EDGECARD 38POS .100 EXTEND
RCC18DRES-S13 CONN EDGECARD 36POS .100 EXTEND
ADR444ARMZ-REEL7 IC VREF SERIES PREC 4.096V 8MSOP
GEC31DRYI-S13 CONN EDGECARD 62POS .100 EXTEND
ADR443ARMZ-REEL7 IC VREF SERIES PREC 3V 8-MSOP
相关代理商/技术参数
参数描述
EVAL-AD7946CBZ 功能描述:BOARD EVALUATION FOR AD7946 RoHS:是 类别:编程器,开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率(每秒):94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源(标准):- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板,软件
EVAL-AD7946SDZ 功能描述:BOARD EVAL FOR AD7946 RoHS:否 类别:编程器,开发系统 >> 评估板 - 模数转换器 (ADC) 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率(每秒):94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源(标准):- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板,软件
EVAL-AD7949CBZ 制造商:Analog Devices 功能描述:EVAL BOARD 8 CH 250KSPS 14BIT ADC IC. - Bulk
EVAL-AD7949EDZ 功能描述:BOARD EVAL AD7949 RoHS:是 类别:编程器,开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率(每秒):94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源(标准):- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板,软件
EVAL-AD7951EDZ 功能描述:BOARD EVAL FOR AD7951 RoHS:是 类别:编程器,开发系统 >> 评估板 - 模数转换器 (ADC) 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率(每秒):94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源(标准):- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板,软件