AD7792:3通道、低噪声、低功耗、16位Σ-Δ型ADC,内置片内仪表放大器和基准电压源

AD7792: 3通道、低噪声、低功耗、16位Σ-Δ型ADC,内置片内仪表放大器和基准电压源

AD7792 功能框图 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.

技术特性

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
低噪声可编程增益仪表放大器
带隙基准电压源,典型漂移值为4 ppm/°C
更新速率：4.17 Hz～470 Hz
3个差分输入
内部时钟振荡器
50 Hz/60 Hz同时抑制
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

技术指标

Resolution (Bits): 16bit
# 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

建议配套产品

Recommended High Accuracy, Precision References - 2.5V for the AD7792
- 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 AD7792
- 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

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

订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7792BRU	Prodn	16 ld TSSOP	16	工业
AD7792BRUZ	Prodn	16 ld TSSOP	16	工业
AD7792BRUZ-REEL	Prodn	16 ld TSSOP	16	工业
EVAL-AD7792EBZ	Prodn	EVALUATION BOARDS	-	待定