参数资料
| 型号： | AD7890BNZ-4 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/28页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT 8CH 24-DIP |
| 标准包装： | 15 |
| 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： | 通孔 |
| 封装/外壳： | 24-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 24-PDIP |
| 包装： | 管件 |
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AD7890
Rev. C | Page 10 of 28
CONTROL REGISTER
The control register for the AD7890 contains 5 bits of information.
Six serial clock pulses must be provided to the part in order to
write data to the control register (seven if the write is required
to put the part in standby mode). If TFS returns high before six
serial clock cycles, then no data transfer takes place to the
control register and the write cycle has to be restarted to write
the data to the control register.
If, however, the CONV bit of the register is set to a Logic 1, then
a conversion is initiated whenever a control register write takes
place regardless of how many serial clock cycles the TFS
remains low for. The default (power-on) condition of all bits in
the control register is 0.
MSB
LSB
A2
A1
A0
CONV
STBY
Table 3.
Bit Name
Description
A2
Address Input. This input is the most significant address input for multiplexer channel selection.
A1
Address Input. This is the 2nd most significant address input for multiplexer channel selection.
A0
Address Input. Least significant address input for multiplexer channel selection. When the address is written to the control
register, an internal pulse is initiated, the pulse width of which is determined by the value of capacitance on the CEXT pin. When
this pulse is active, it ensures the conversion process cannot be activated. This allows for the multiplexer settling time,
track/hold acquisition time before the track/hold goes into hold, and the conversion is initiated. In applications where there is
an antialiasing filter between the MUX OUT pin and the SHA IN pin , the filter settling time can be taken into account before the
input on the SHA IN pin is sampled. When the internal pulse times out, the track/hold goes into hold and conversion is initiated.
CONV
Conversion Start. Writing a 1 to this bit initiates a conversion in a similar manner to the CONVST input. Continuous conversion
starts do not take place when there is a 1 in this location. The internal pulse and the conversion process are initiated after the
sixth serial clock cycle of the write operation if a 1 is written to this bit. With a 1 in this bit, the hardware conversion start (the
CONVST input) is disabled. Writing a 0 to this bit enables the hardware CONVST input.
STBY
Standby Mode Input. Writing a 1 to this bit places the device in its standby, or power-down, mode. Writing a 0 to this bit places
the device in its normal operating mode. The part does not enter its standby mode until the seventh falling edge of SCLK in a
write operation. Therefore, the part requires seven serial clock pulses in its serial write operation if it is required to put the part
into standby.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7890BR-10 | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:否 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 |
| AD7890BR-10REEL | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:否 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 |
| AD7890BR-2 | 制造商:Analog Devices 功能描述:ADC Single SAR 117ksps 12-bit Serial 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:8-CH,100K,12-BIT ADC - Bulk |
| AD7890BR-2REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 117ksps 12-bit Serial 24-Pin SOIC W T/R |
| AD7890BR-4 | 功能描述:IC DAS 12BIT 8CH 24-SOIC RoHS:否 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 |
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