参数资料
| 型号： | AD7890BRZ-10REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT 8CH 24-SOIC |
| 产品培训模块： | Power Line Monitoring |
| 标准包装： | 1,000 |
| 类型： | 数据采集系统（DAS） |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 117k |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
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AD7890
Rev. C | Page 15 of 28
In the self-clocking mode, the AD7890 indicates when
conversion is complete by bringing the RFS line low and
initiating a serial data transfer. In the external clocking mode,
there is no indication of when conversion is complete. In many
applications, this is not a problem as the data can be read from
the part during conversion or after conversion. However,
applications that seek to achieve optimum performance from
the AD7890 has to ensure that the data read does not occur
during conversion or during 500 ns prior to the rising edge
of CONVST.
This can be achieved in either of two ways. The first is to ensure
in software that the read operation is not initiated until 5.9 μs
after the rising edge of CONVST. This is only possible if the
software knows when the CONVST command is issued. The
second scheme would be to use the CONVST signal as both the
conversion start signal and an interrupt signal. The simplest
way to do this is to generate a square wave signal for CONVST
with high and low times of 5.9 μs (see Figure 8). Conversion is
initiated on the rising edge of CONVST. The falling edge of
CONVST occurs 5.9 μs later and can be used as either an active
low or falling edge-triggered interrupt signal to tell the
processor to read the data from the AD7890. Provided the read
operation is completed 500 ns before the rising edge of
CONVST, the AD7890 operates to specification.
This scheme limits the throughput rate to 11.8 μs minimum.
However, depending upon the response time of the
microprocessor to the interrupt signal and the time taken by the
processor to read the data, this may be the fastest which the
system could have operated. In any case, the CONVST signal
does not have to have a 50:50 duty cycle. This can be tailored to
optimize the throughput rate of the part for a given system.
Alternatively, the CONVST signal can be used as a normal
narrow pulse width. The rising edge of CONVST can be used as
an active high or rising edge-triggered interrupt. A software
delay of 5.9 μs can then be implemented before data is read
from the part.
NEXT CONVST
RISING EDGE
CONVERSION IS
INITIATED AND
TRACK/HOLD GOES
INTO HOLD
CONVERSION
ENDS 5.9s
LATER
MICROPROCESSOR
INT SERVICE
OR POLLING
ROUTINE
SERIAL READ
AND WRITE
OPERATIONS
READ AND WRITE
OPERATIONS SHOULD
END 500ns PRIOR
TO NEXT RISING
EDGE OF CONVST
tCONVERT
500ns MIN
RFS
TFS
CONVST
SCLK
01
35
7-
0
08
Figure 8. CONVST Used as Status Signal in External Clocking Mode
相关PDF资料 |
PDF描述 |
|---|---|
| VI-B1J-IU-F2 | CONVERTER MOD DC/DC 36V 200W |
| AD7890BRZ-2REEL | IC DAS 12BIT 8CH 24-SOIC |
| VE-B1L-IU-F3 | CONVERTER MOD DC/DC 28V 200W |
| VE-B1L-IU-F2 | CONVERTER MOD DC/DC 28V 200W |
| VE-B1L-IU-F1 | CONVERTER MOD DC/DC 28V 200W |
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| AD7890BRZ-2 | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7890BRZ-2REEL | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7890BRZ-4 | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7890BRZ-4REEL | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7890SQ-10 | 功能描述:模数转换器 - ADC LC2MOS 8CH 12B Data Acquisition System RoHS:否 制造商:Analog Devices 通道数量: 结构: 转换速率: 分辨率: 输入类型: 信噪比: 接口类型: 工作电源电压: 最大工作温度: 安装风格: 封装 / 箱体: |
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