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参数资料
| 型号： | AD7946 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| 中文描述： | 14位，500 kSPS的PulSAR系列⑩模数转换器，采用MSOP / QFN封装 |
| 文件页数： | 8/27页 |
| 文件大小： | 301K |
| 代理商： | AD7946 |
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AD7946
Preliminary Technical Data
Rev Pr D | Page 16 of 27
Power Supply
The AD7946 is specified 4.5 V to 5.5 V. It uses two power
supply pins: a core supply VDD and a digital input/output
interface supply VIO. VIO allows direct interface with any logic
between 1.8 V and VDD. To reduce the supplies needed, the
VIO and VDD can be tied together. The AD7946 is
independent of power supply sequencing between VIO and
VDD. Additionally, it is very insensitive to power supply
variations over a wide frequency range, as shown in Figure 26,
which represents PSRR over frequency.
Figure 26. PSRR vs. Frequency
The AD7946 powers down automatically at the end of each
conversion phase and, therefore, the power scales linearly with
the sampling rate as shown in see Figure 27. This makes the
part ideal for low sampling rate (even a few Hz) and low
battery-powered applications.
Figure 27. Operating Currents vs. Sampling Rate
Supplying the ADC from the Reference
For simplified applications, the AD7946, with its low operating
current, can be supplied directly using the reference circuit, as
shown in Figure 28. The reference line can be driven by either:
The system power supply directly
A reference voltage with enough current output
capability, such as the ADR43x
A reference buffer, such as the AD8031, that can also
filter the system power supply, as shown in Figure 28.
AD8031
AD7946
VIO
REF
VDD
10
F
1
F
10
10k
5V
1
F
(NOTE 1)
NOTE 1: OPTIONAL REFERENCE BUFFER AND FILTER
Figure 28. Example of Application Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD79461 | 制造商:AD 制造商全称:Analog Devices 功能描述:18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN) |
| AD7946BCP | 制造商:Analog Devices 功能描述:ADC SGL SAR 500KSPS 14BIT SERL 10LFCSP EP - Bulk |
| AD7946BCPRL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| AD7946BCPWP | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| AD7946BCPZRL | 功能描述:IC ADC 14BIT 500KSPS 10-LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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