EVAL-AD7785EBZ: 3通道、低噪声、低功耗、20位Σ-Δ型ADC,内置片内仪表放大器和基准电压源
AD7785是一款适合高精度测量应用的低噪声、低功耗、完整模拟前端,内置一个含有三个差分模拟输入的低噪声20位Σ-Δ型ADC,还集成了片内低噪声仪表放大器,因而该ADC可直接输入小信号。当增益设置为64、更新速率为4.17 Hz时,均方根（RMS）噪声为40 nV。
该器件内置一个精密低噪声、低漂移内部带隙基准电压源,也可采用外部差分基准电压。其它片内特性包括可编程激励电流源、熔断电流控制和偏置电压产生器,利用偏置电压产生器可将某一通道的共模电压设置为AVDD/2。AD7785可以采用内部时钟或外部时钟工作,输出数据速率可通过软件编程设置,可在4.17 Hz至470 Hz的范围内变化。这款器件采用2.7 V至5.25 V电源供电,典型功耗为400 uA,采用16引脚TSSOP封装。
The AD7785 is a low power, low noise, complete analog front ends for high precision measurement applications. It contains a low noise 20-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 40 nV when the update rate equals 4.17 Hz.
The device contains a precision low noise, low drift internal band gap reference and can also accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator, the bias voltage generator being used to set the common-mode voltage of a channel to AVDD/2.
The device can be operated with either the internal clock or an external clock. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 400 uA typical and is housed in 16-lead TSSOP packages.
产品应用领域 Applications
- 热电偶测量
- RTD测量
- 热敏电阻测量
- 气体分析
- 工业过程控制
- 仪器仪表
- 便携式仪器仪表
- 血液分析
- 智能发射机
- 液体/气体色谱
- 6位DVM
产品应用领域 Applications
- Thermocouple measurements
- RTD measurements
- Thermistor measurements
- Gas analysis
- Industrial process control
- Instrumentation
- Portable instrumentation
- Blood analysis
- Smart transmitters
- Liquid/gas chromatography
- 6-digit DVM
EVAL-AD7785EBZ 特点
- 最高20位有效分辨率
- 均方根（RMS）噪声
40 nV（4.17 Hz时）
85 nV（16.7 Hz时） - 功耗：400 uA（典型值）
- 省电模式：最大1 uA
- 低噪声可编程增益仪表放大器
- 带隙基准电压源,漂移典型值为4 ppm/°C
- 更新速率：4.17 Hz～470 Hz
- 3个差分输入
- 50 Hz、60 Hz同时抑制
- Up to 20 bits effective resolution
- RMS noise
40 nV @ 4.17 Hz
85 nV @ 16.7 Hz - Current: 400 uA typ
- Power-down: 1 uA max
- Low noise programmable gain instrumentation amp
- Band gap reference with 4 ppm/°C drift typ
- Update rate: 4.17 Hz to 470 Hz
- 3 differential inputs
- Simultaneous 50 Hz/60 Hz rejection
EVAL-AD7785EBZ 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7785BRUZ | Prodn | 16 ld TSSOP | 16 | 工业 |
| AD7785BRUZ-REEL | Prodn | 16 ld TSSOP | 16 | 工业 |
| EVAL-AD7785EBZ | Prodn | EVALUATION BOARDS | - | 待定 |
EVAL-AD7785EBZ 应用技术支持与电子电路设计开发资源下载
- AD7785 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