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参数资料
| 型号： | AD7991YRJZ-0RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 4CH I2C SOT23-8 |
| 产品变化通告： | AD7991,5,9 Offset Error Change 17/Sept/2010 |
| 设计资源： | Using AD8599 as an Ultralow Distortion Driver for the AD7991 (CN0043) |
| 标准包装： | 10,000 |
| 位数： | 12 |
| 采样率（每秒）： | 1M |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 4.68mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 4 个单端，单极 |
| 配用： | EVAL-AD7991EBZ-ND - BOARD EVAL FOR AD7991 |
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AD7991/AD7995/AD7999
Rev. B | Page 18 of 28
TYPICAL CONNECTION DIAGRAM
Figure 22 shows the typical connection diagram for the
AD7991/AD7995/AD7999.
The reference voltage can be taken from the supply voltage,
VDD. However, the AD7991/AD7995/AD7999 can be configured
to be a 3-channel device with the reference voltage applied to
the VIN3/VREF pin. In this case, a 1 μF decoupling capacitor on
the VIN3/VREF pin is recommended.
SDA and SCL form the 2-wire I2C compatible interface. External
pull-up resistors are required for both the SDA and SCL lines.
The AD7991-0/AD7995-0 and the AD7991-1/AD7995-1/
AD7999-1 support standard, fast, and high speed I2C interface
modes. Both the -0 and -1 devices have independent I2C addresses,
which allows the devices to connect to the same I2C bus without
contention issues.
The part requires approximately 0.6 μs to wake up from power-
down and to acquire the analog input. Once the acquisition
phase ends, the conversion phase starts and takes approximately
1 μs to complete. The AD7991/AD7995/AD7999 enters
shutdown mode after each conversion, which is useful in
applications where power consumption is a concern.
ANALOG INPUT
Figure 21 shows an equivalent circuit of the AD7991/AD7995/
AD7999 analog input structure. The two diodes, D1 and D2,
provide ESD protection for the analog inputs. Care must be taken
to ensure that the analog input signal does not exceed the supply
rails by more than 300 mV. If the signal does exceed this level,
the diodes become forward-biased and start conducting current
into the substrate. Each diode can conduct a maximum current
of 10 mA without causing irreversible damage to the part.
06
461
-02
3
VIN
D1
VDD
D2
R1
C2
30pF
C1
4pF
CONVERSION PHASE—SWITCH OPEN
TRACK PHASE—SWITCH CLOSED
Figure 21. Equivalent Analog Input Circuit
Capacitor C1 in Figure 21 is typically about 4 pF and can
primarily be attributed to pin capacitance. Resistor R1 is a
lumped component composed of the on resistance (RON) of
both a track-and-hold switch and the input multiplexer. The
total resistor is typically about 400 Ω. Capacitor C2, the ADC
sampling capacitor, has a typical capacitance of 30 pF.
VIN0
RP
VDD
5V SUPPLY
10F
0.1F
MICROCONTROLLER/
MICROPROCESSOR
2-WIRE SERIAL
INTERFACE
GND
AD7991/
AD7995/
AD7999
SDA
SCL
06
46
1-
02
4
VIN1
VIN2
VIN3/VREF
+
Figure 22. AD7991/AD7995/AD7999 Typical Connection Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7991YRJZ-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, 12-/10-/8-Bit ADC with I2CCompatible Interface in 8-Lead SOT23 |
| AD7991YRJZ-1500RL7 | 功能描述:IC ADC 12BIT 4CH SAR I2C SOT23-8 RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7991YRJZ-1RL | 功能描述:IC ADC 12BIT 4CH I2C SOT23-8 RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7992 | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
| AD7992_05 | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
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