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参数资料
| 型号： | EVAL-AD7991EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7991 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行 |
| 输入范围： | 0 ~ Vdd |
| 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： | AD7991 |
| 已供物品： | 板，缆线，CD |
| 产品目录页面： | 780 (CN2011-ZH PDF) |
| 相关产品： | AD7991YRJZ-1RL-ND - IC ADC 12BIT 4CH I2C SOT23-8 AD7991YRJZ-0RL-ND - IC ADC 12BIT 4CH I2C SOT23-8 AD7991YRJZ-1500RL7DKR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-0500RL7DKR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-1500RL7CT-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-0500RL7CT-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-1500RL7TR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-0500RL7TR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 |
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AD7991/AD7995/AD7999
Rev. B | Page 25 of 28
PLACING THE AD7991/AD7995/AD7999 INTO HIGH SPEED MODE
High speed mode communication commences after the master
addresses all devices connected to the bus with the master code,
00001XXX, to indicate that a high speed mode transfer is to
begin. No device connected to the bus is allowed to acknowledge
the high speed master code; therefore, the code is followed by a
NO ACK (see Figure 26). The master must then issue a repeated
start, followed by the device address and an R/W bit. The selected
device then acknowledges its address.
All devices continue to operate in high speed mode until the
master issues a stop condition. When the stop condition is
issued, the devices return to fast mode.
To guarantee performance above fSCL = 1.7 MHz, the user must
perform clock stretching—that is, the clock must be held high—for
2 μs after the ninth clock rising edge (see Figure 27). Therefore,
the clock must be held high for 2 μs after the device starts to power
up (see the Reading from the AD7991/AD7995/AD7999 section).
0
64
61
-02
8
SDA
ACK BY
ADC
START BY
MASTER
HS MODE MASTER CODE
SERIAL BUS ADDRESS BYTE
NO ACK
19
1
9
01
0
A0
X
1
0
SCL
0
1
X
Sr
FAST MODE
HIGH SPEED MODE
Figure 26. Placing the Part into High Speed Mode
06
46
1-
03
0
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
CLOCK HIGH TIME = 2s
Figure 27. Reading Two Bytes of Data from the Conversion Result Register in High Speed Mode for AD7991
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7991EBZ | 制造商:Analog Devices 功能描述:AD7991, ADC, I2C, EVALUATION BOARD |
| EVAL-AD7992CB | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
| EVAL-AD7992EBZ | 功能描述:BOARD EVALUATION FOR AD7992 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-AD7993CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
| EVAL-AD7993CBZ | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
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