AD7799:3通道、低噪声、低功耗、24位Σ-Δ型ADC,内置片内仪表放大器

AD7799: 3通道、低噪声、低功耗、24位Σ-Δ型ADC,内置片内仪表放大器

AD7798/AD7799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,AD7799的均方根（RMS）噪声为27 nV,AD7798的均方根（RMS）噪声为40 nV。AD7798/AD7799片内特性包括一个低端电源开关、基准电压检测、可编程数字输出引脚、熔断电流控制和一个内部时钟振荡器。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。AD7798/AD7799采用2.7 V至5.25 V电源供电,AD7798的典型功耗为300 µA,而AD7799的典型功耗为380 µA,两款器件均采用16引脚TSSOP封装。

The AD7798/AD7799 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7798/AD7799 contains 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 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.

On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. 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. The AD7798 consumes a current of 300 μA typical, whereas the AD7799 consumes 380 μA typical. Both devices are housed in a 16-lead TSSOP package.

AD7799 特点

均方根（RMS）噪声：
27 nV（4.17 Hz、AD7799）
65 nV（16.7 Hz、AD7799）
40 nV（4.17 Hz、AD7798）
85 nV（16.7 Hz、AD7798）
功耗：380 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
更新速率：4.17 Hz至470 Hz；3个差分输入
内部时钟振荡器
50 Hz/60 Hz同时抑制
基准电压检测
低端电源开关
可编程数字输出
熔断电流控制
电源电压：2.7 V至5.25 V
RMS noise:
27 nV at 4.17 Hz (AD7799)
65 nV at 16.7 Hz (AD7799)
40 nV at 4.17 Hz (AD7798)
85 nV at 16.7 Hz (AD7798)
Current: 380 μA typical
Power-down: 1 μA maximum
Low noise, programmable gain, instrumentation amp
Update rate: 4.17 Hz to 470 Hz 3 differential inputs
Internal clock oscillator
Simultaneous 50 Hz/60 Hz rejection
Reference detect
Low-side power switch
Programmable digital outputs
Burnout currents
Power supply: 2.7 V to 5.25 V

AD7799 技术指标

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

AD7799 应用领域

电子秤
压力测量
应变计传感器
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

Weigh scales
Pressure measurement
Strain gauge transducers
Gas analysis
Industrial process control
Instrumentation
Portable instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromotography 6-digit DVM

AD7799 建议配套产品

Recommended References for the AD7799
- In a non-ratiometric application, we recommend the ADR381 or the ADR391 low noise, low power 2.5V reference.
- For lowest noise and higher accuracy, we recommend the ADR421 or the ADR431.
Recommended Precision Amplifiers for the AD7799
- For low noise and low power applications, we recommend the ADA4051-2.
- For more precision and great temperature dirft specs, we recommend AD8539.
- For higher supply voltages up to +-8V, we recommend AD8639.
Recommended Power Solutions
- For selecting voltage regulator products, use ADIsimPower.
- For selecting supervisor products, use the Supervisor Parametric Search.

AD7799 功能框图

AD7799 产品选型

产品型号	产品状态	封装	引脚	温度范围
AD7799BRU	Prodn	16 ld TSSOP	16	工业
AD7799BRU-REEL	Prodn	16 ld TSSOP	16	工业
AD7799BRUZ	Prodn	16 ld TSSOP	16	工业
AD7799BRUZ-REEL	Prodn	16 ld TSSOP	16	工业
EVAL-AD7799EBZ	Prodn	EVALUATION BOARDS	-	待定