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参数资料
| 型号： | EVAL-AD7995EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/28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 26 of 28
MODE OF OPERATION
The AD7991/AD7995/AD7999 powers up in shutdown mode.
After the master addresses the AD7991/AD7995/AD7999 with
the correct I2C address, the ADC acknowledges the address. In
response, the AD7991/AD7995/AD7999 power up.
During this wake up time, the AD7991/AD7995/AD7999 exit
shutdown mode and begin to acquire the analog input (acquisition
phase). By default, all channels are selected. Which channels
are converted depends on the status of the channel bits in the
configuration register.
When the read address is acknowledged, the ADC outputs two
bytes of conversion data. The first byte contains four status bits
and the four MSBs of the conversion result. The status bits
contain two leading 0s and two channel-identifier bits. After
this first byte, the AD7991/AD7995/AD7999 outputs the
second byte of the conversion result. For the AD7991, this
second byte contains the lower eight bits of conversion data. For
the AD7995, this second byte contains six bits of conversion
data plus two trailing 0s. For the AD7999, this second byte
contains four bits of conversion data and four trailing 0s.
The master then sends a NO ACK to the AD7991/AD7995/
AD7999, as long as no further reads are required. If the master
instead sends an ACK to the AD7991/AD7995/AD7999, the
ADC powers up and completes another conversion. When
more than one channel bit has been set in the configuration
register, this conversion is performed on the second channel in
the selected sequence. If only one channel is selected, the ADC
converts again on the selected channel.
06
46
1-
02
9
Sr
RA
A
SECOND DATA BYTE
(LSB)
FIRST DATA BYTE
(MSB)
7-BIT ADDRESS
SCL
SDA
A
11
9
Sr/P
ACK. BY
ADC
ACK. BY
MASTER
NO ACK. BY
MASTER
Figure 28. Mode of Operation, Single-Channel Conversion
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