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| 型号： | EVAL-AD7920CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7920 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 250k |
| 数据接口： | 串行 |
| 输入范围： | 0 ~ Vdd |
| 在以下条件下的电源（标准）： | 12.5mW @ 250kSPS，5V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7920 |
| 已供物品： | 板，CD |
| 相关产品： | AD7920BKSZ-500RL7TR-ND - IC ADC 12BIT SRL 250KSPS SC70-6 AD7920AKSZ-REEL7-ND - IC ADC 12BIT SRL 250KSPS SC70-6 AD7920AKSZ-500RL7TR-ND - IC ADC 12BIT SRL 250KSPS SC70-6 AD7920BRMZ-REEL7-ND - IC ADC 12BIT SRL 250KSPS 8MSOP AD7920BKSZ-REEL7-ND - IC ADC 12BIT SRL 250KSPS SC70-6 AD7920BKSZ-REEL-ND - IC ADC 12BIT SRL 250KSPS SC70-6 AD7920BRMZ-REEL-ND - IC ADC 12BIT SRL 250KSPS 8MSOP AD7920BRMZ-ND - IC ADC 12BIT 250KSPS 8-MSOP |
AD7910/AD7920
Rev. C | Page 17 of 24
VALID DATA
CS
SCLK
SDATA
110
12
14
16
AD7910/AD7920
02976-019
Figure 19. Normal Mode Operation
THREE-STATE
SDATA
SCLK
CS
110
12
14
16
2
02976-020
Figure 20. Entering Power-Down Mode
SCLK
CS
SDATA
THE PART
BEGINS TO
POWER UP
THE PART IS FULLY
POWERED UP WITH
VIN FULLY ACQUIRED
A
10
12
14
16
1
16
VALID DATA
INVALID DATA
02976-021
1
Figure 21. Exiting Power-Down Mode
When power supplies are first applied to the AD7910/AD7920, the
ADC can power up in either power-down mode or in normal
mode. Because of this, it is best to allow a dummy cycle to elapse to
ensure the part is fully powered up before attempting a valid
conversion. Likewise, if the intention is to keep the part in power-
down mode while not in use and the user wishes the part to power
up in power-down mode, the dummy cycle can be used to ensure
the device is in power-down mode by executing a cycle such as that
shown in Figure 20. Once supplies are applied to the
AD7910/AD7920, the power-up time is the same as that when
powering up from power-down mode. It takes approximately 1 μs
to power up fully if the part powers up in normal mode. It is not
necessary to wait 1 μs before executing a dummy cycle to ensure
the desired mode of operation.
Instead, the dummy cycle can occur directly after power is
supplied to the ADC. If the first valid conversion is performed
directly after the dummy conversion, care must be taken to
ensure that adequate acquisition time is allowed. As mentioned
earlier, when powering up from the power-down mode, the part
returns to track upon the first SCLK edge applied after the
falling edge of CS. However, when the ADC powers up initially
after supplies are applied, the track-and-hold is in track. This
means, assuming the user has the facility to monitor the ADC
supply current, if the ADC powers up in the desired mode of
operation and thus a dummy cycle is not required to change
mode then a dummy cycle is required to place the track-and-
hold into track.
相关PDF资料 |
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| SDR0503-150ML | INDUCTOR POWER 15UH 20% SMD |
| VI-B31-EY | CONVERTER MOD DC/DC 12V 50W |
| MLK1005S4N3S | INDUCTOR MULTILAYER 4.3NH 0402 |
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| EVAL-AD7922CB | 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk |
| EVAL-AD7922CBZ | 功能描述:BOARD EVAL FOR AD7922 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 |
| EVAL-AD7923CB2 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP |
| EVAL-AD7923CBZ | 功能描述:BOARD EVAL FOR AD7923 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 |
| EVAL-AD7927CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
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