AD7787BRM: 低功耗、双通道、24位Σ-Δ型ADC
AD7787是一款适合低频测量应用的低功耗、完整模拟前端,内置一个低噪声24位Σ-Δ型ADC,该ADC具有一个差分输入和一个可缓冲或无缓冲的单端输入。该器件采用内部时钟工作,因此,用户不必为其提供时钟源。AD7787的输出数据速率可通过软件编程设置,可在9.5 Hz至120 Hz的范围内变化,更新速率较低时均方根（RMS）噪声为1.1 uV。内部时钟频率可以使用系数2、4或8进行分频,从而可以降低功耗。更新速率、截止频率和建立时间与时钟频率成比例变化。该器件采用2.5 V至5.25 V电源供电。工作电压为3 V时,最大功耗为225 uW,采用10引脚MSOP封装。
The AD7787 is a low power, complete analog front end for low frequency measurement applications. It contains a low noise 24-bit Σ-Δ ADC with one differential input and one single-ended input that can be buffered or unbuffered.
The device operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate from the part is software programmable and can be varied from 9.5 Hz to 120 Hz, with the rms noise equal to 1.1 uV at the lower update rate. The internal clock frequency can be divided by a factor of 2, 4, or 8, which leads to a reduction in the current consumption. The update rate, cutoff frequency, and settling time will scale with the clock frequency.
The part operates with a power supply from 2.5 V to 5.25 V. When operating from a 3 V supply, the power dissipation for the part is 225 uW maximum. It is housed in a 10-lead MSOP.
AD7787BRM 特点
- 电源：
- 工作电压：2.5 V至5.25 V
- 正常模式：最大75 uA
- 省电模式：最大1 uA - 均方根（RMS）噪声：1.1 uV（9.5 Hz更新速率时）
- 19.5位峰－峰值分辨率（22位有效分辨率）
- 积分非线性：3.5 ppm（典型值）
- 50 Hz和60 Hz同时抑制
- 内部时钟振荡器
- 轨到轨输入缓冲
- VDD 监控通道
- 温度范围：–40°C～+105°C
- 10引脚MSOP封装
- 接口：
- 三线式串行接口
- SPI(R)、QSPITM、MICROWIRETM、DSP兼容
- SCLK上为施密特触发器 - Power
- Supply: 2.5 V to 5.25 V current
- Normal: 75 uA max
- Power-down: 1 uA max - RMS noise: 1.1 uV at 9.5 Hz update rate
- 19.5-bit p-p resolution (22 bits effective resolution)
- Integral nonlinearity: 3.5 ppm typical
- Simultaneous 50 Hz and 60 Hz rejection
- Internal clock oscillator
- Rail-to-rail input buffer
- VDD monitor channel
- Temperature range: –40°C to +105°C
- 10-lead MSOP
- Interface
- 3-wire serial
- SPI(R), QSPITM, MICROWIRETM and DSP compatible
- Schmitt trigger on SCLK
AD7787BRM 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7787BRM | Prodn | 10 ld MSOP | 10 | 工业 |
| AD7787BRM-REEL | Prodn | 10 ld MSOP | 10 | 工业 |
| AD7787BRMZ | Prodn | 10 ld MSOP | 10 | 工业 |
| EVAL-AD7787EB | Prodn | EVALUATION BOARDS | - | 待定 |
AD7787BRM 应用技术支持与电子电路设计开发资源下载
- AD7787 数据手册DataSheet下载. pdf
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
- ADC模数转换器选型指南 . PDF