AD7793:3通道、低噪声、低功耗、24位Σ-Δ型ADC,内置片内仪表放大器和基准电压源

AD7793: 3通道、低噪声、低功耗、24位Σ-Δ型ADC,内置片内仪表放大器和基准电压源

AD7792/AD7793均为适合高精度测量应用的低功耗、低噪声、完整模拟前端,内置一个低噪声16位/24位Σ-Δ型ADC,其中含有3个差分模拟输入,还集成了片内低噪声仪表放大器,因而可直接输入小信号。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。

两款器件均内置一个精密低噪声、低漂移内部带隙基准电压源,而且也可采用一个外部差分基准电压。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。AD7792/AD7793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。AD7792/AD7793采用2.7 V至5.25 V电源供电,典型功耗为400 µA,采用16引脚TSSOP封装。

The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain a low noise 16-/24-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 devices contain a precision low noise, low drift internal band gap reference and can 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 sets the common-mode voltage of a channel to AVDD/2.The devices can be operated with either the internal clock or an external clock. The output data rate from the parts is software-programmable and can be varied from 4.17 Hz to 470 Hz.The parts operate with a power supply from 2.7 V to 5.25 V. They consume a current of 400 μA typical and are housed in a 16-lead TSSOP package.

AD7793 特点

最高23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 µA（典型值）
省电模式：最大1 µA
更新速率：4.17 Hz～470 Hz
3个差分输入
Up to 23 bits effective resolution
RMS noise
40 nV @ 4.17 Hz
85 nV @ 16.7 Hz
Current: 400 μA typical
Power-down: 1 μA maximum
Low noise programmable gain instrumentation amp
Band gap reference with 4 ppm/°C drift typical
Update rate: 4.17 Hz to 470 Hz
3 differential inputs
Internal clock oscillator
Simultaneous 50 Hz/60 Hz rejection

AD7793 技术指标

Resolution (Bits): 24bit
# Chan: 3
Sample Rate: n/a
Interface: SPI,Ser
Analog Input Type: Diff-Uni
Ain Range: (2Vref/PGA Gain) p-p
ADC Architecture: Sigma-Delta
Pkg Type: SOP

AD7793 应用领域

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

AD7793 建议配套产品

Recommended High Accuracy, Precision References - 2.5V for the AD7793
- For applications requiring the lowest noise performance and output trim adjust, we recommend the ADR441.
- For high output current applications, we recommend the ADR431.
- For wide supply applications, we recommend the AD780.
- For cost sensitive applications, we suggest the AD1582 or the ADR391.
Recommended Digital Isolators for the AD7793
- For process control applications, we recommend the ADuM1400 and the ADuM1200 icoupler.
- For cost sensitive designs, we recommend the ADuM7440, ADuM7441 or ADuM7442.
- For digital isolators with integrated isolated power, we suggest the ADuM5401, ADuM5402 or the ADuM5403.
- For isolated USB designs in healthcare and industrial control, we recommend the ADuM4160.
Recommended Power Solutions
- For selecting voltage regulator products, use ADIsimPower.
- For selecting supervisor products, use the Supervisor Parametric Search.

AD7793 功能框图

AD7793 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7793BRU	Prodn	16 ld TSSOP	16	工业
AD7793BRUZ	Prodn	16 ld TSSOP	16	工业
AD7793BRUZ-REEL	Prodn	16 ld TSSOP	16	工业
EVAL-AD7793EBZ	Prodn	EVALUATION BOARDS	-	待定