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参数资料
| 型号： | EVAL-AD7995EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7995 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行 |
| 输入范围： | 0 ~ 5.5 V |
| 在以下条件下的电源（标准）： | 4.4mW @ 5.5V，3.4MHz |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7995 |
| 已供物品： | 板，缆线，CD |
| 相关产品： | AD7995YRJZ-1RL-ND - IC ADC 10BIT 4CH I2C SOT23-8 AD7995YRJZ-0RL-ND - IC ADC 10BIT 4CH I2C SOT23-8 AD7995YRJZ-1500RL7DKR-ND - IC ADC 10BIT 4CH SAR I2C SOT23-8 AD7995YRJZ-0500RL7DKR-ND - IC ADC 10BIT 4CH SAR I2C SOT23-8 AD7995YRJZ-1500RL7CT-ND - IC ADC 10BIT 4CH SAR I2C SOT23-8 AD7995YRJZ-0500RL7CT-ND - IC ADC 10BIT 4CH SAR I2C SOT23-8 AD7995YRJZ-1500RL7TR-ND - IC ADC 10BIT 4CH SAR I2C SOT23-8 AD7995YRJZ-0500RL7TR-ND - IC ADC 10BIT 4CH SAR I2C SOT23-8 |
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AD7991/AD7995/AD7999
Rev. B | Page 24 of 28
READING FROM THE AD7991/AD7995/AD7999
Reading data from the conversion result register is a 2-byte
operation, as shown in Figure 25. Therefore, a read operation
always involves two bytes.
After the AD7991/AD7995/AD7999 have received a read
address, any number of reads can be performed from the
conversion result register.
Following a start condition, the master writes the 7-bit address
of the AD7991/AD7995/AD7999 and then sets R/W to 1. The
AD7991/AD7995/AD7999 acknowledge this by pulling the
SDA line low. They then output the conversion result over the
I2C bus, preceded by four status bits. The status bits are two
leading 0s followed by the channel identifier bits. For the
AD7995 there are two trailing 0s, and for the AD7999 there are
four trailing 0s.
After the master has addressed the AD7991/AD7995/AD7999,
the part begins to power up on the ninth SCLK rising edge. At
the same time, the acquisition phase begins. When approximately
0.6 μs have elapsed, the acquisition phase ends. The input is
sampled and a conversion begins. This is done in parallel to the
read operation and should not affect the read operation. The
master reads back two bytes of data. On the ninth SCLK rising
edge of the second byte, if the master sends an ACK, it keeps
reading conversion results and the AD7991/AD7995/AD7999
powers up and performs a second conversion. If the master sends
a NO ACK, the AD7991/AD7995/AD7999 does not power up
on the ninth SCLK rising edge of the second byte. If a further
conversion is required, the part converts on the next channel, as
selected in the configuration register. See Table 11 for information
about the channel selection.
If the master sends a NO ACK on the ninth SCLK rising edge of
the second byte, the conversion is finished and no further
conversion is preformed.
To put the part into full shutdown mode, the user should issue a
stop condition to the AD7991/AD7995/AD7999. If the AD7991/
AD7995/AD7999 is not put into full shutdown mode, it will draw
a few tens of microamperes from the supply.
0
6461
-0
27
SDA
11
9
D10
D9
D8
A0
1
00
0
SCL
1
D11
1
D7
D6
D5
D2
D1
D0
D4
D3
SCL (CONTINUED)
SDA (CONTINUED)
CHID1 CHID0
R/W
9
START BY
MASTER
ACK BY
ADC
NO ACK BY
MASTER
ACK BY
MASTER
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM ADC
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM ADC
Figure 25. Reading Two Bytes of Data from the AD7991Conversion Result Register
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7997CBZ | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD (ROHS) - Bulk |
| EVAL-AD7997EBZ | 功能描述:BOARD EVAL FOR AD7997 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-AD7998CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
| EVAL-AD7998CBZ | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
| EVAL-AD7998EBZ | 功能描述:BOARD EVAL FOR AD7998 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 |
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