AD7730:CMOS、24位Σ-Δ、桥式传感器ADC,适合负荷传感器应用

AD7730: CMOS、24位Σ-Δ、桥式传感器ADC,适合负荷传感器应用

AD7730是一款适合称重和压力测量应用的完整模拟前端,可直接接受来自传感器的低电平信号,并输出串行数字字。输入信号作用于一个以模拟调制器为基础的专有可编程增益前端。

调制器输出由低通可编程数字滤波器处理,滤波器截止、输出速率和建立时间可通过编程进行调整。该器件具有两个缓冲差分可编程增益模拟输入和一个差分基准电压输入,采用+5 V单电源供电。它接受四种单极性模拟输入范围：0 mV至+10 mV、+20 mV、+40 mV和+80 mV,以及四种双极性范围：±10 mV、±20 mV、±40 mV和±80 mV。该器件可直接实现的峰－峰值分辨率为1/230,000,还拥有一个片内6位DAC,因此不需要TARE电压,同时还提供用于同步电桥交流激励的时钟信号。该器件上的串行接口可配置用于三线式操作,并且与微控制器和数字信号处理器兼容。AD7730包含自校准和系统校准选项,失调漂移小于5 nV/°C,增益漂移小于2 ppm/°C。该器件提供24引脚塑料DIP、24引脚SOIC和24引脚TSSOP三种封装。

The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.

The part features two buffered differential programmable gain analog inputs as well as a differential reference input. The part operates from a single +5 V supply. It accepts four unipolar analog input ranges: 0 mV to ±10 mV, +20 mV, +40 mV and +80 mV and four bipolar ranges: ±10 mV, ±20 mV, ±40 mV and ±80 mV. The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts. An on-chip 6-bit DAC allows the removal of TARE voltages. Clock signals for synchronizing ac excitation of the bridge are also provided.The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7730 contains self-calibration and system calibration options, and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C. The part is available in a 24-pin plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.

AD7730 特点

分辨率：230,000采样数（峰－峰值）
失调漂移：5 nV/°C
增益漂移：2 ppm/°C
线路频率抑制：>150 dB
缓冲差分输入
可编程滤波器截止
稳定的时间漂移特性
基准电压：1 V至5 V

Resolution of 230,000 Counts (Peak-to-Peak)
Offset Drift: 5 nV/°C
Gain Drift: 2 ppm/°C
Line Frequency Rejection: >150 dB
Buffered Differential Inputs
Programmable Filter Cutoffs
Specified for Drift Over Time
Operates with Reference Voltages of 1 V to 5 V

AD7730 技术指标

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

AD7730 建议配套产品

Recommended Precision References for the AD7730
- For low noise, low power in non-ratiometric applications, we recommend the ADR421.
- For high current output in non-ratiometric applications, we recommend the ADR431.
Recommended Power Solutions
- For selecting voltage regulator products, use ADIsimPower.
- For selecting supervisor products, use the Supervisor Parametric Search.

AD7730 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7730BN	量产	24 ld PDIP	24	工业
AD7730BNZ	量产	24 ld PDIP	24	工业
AD7730BR	量产	24 ld SOIC - Wide	24	工业
AD7730BR-REEL	量产	24 ld SOIC - Wide	24	工业
AD7730BR-REEL7	量产	24 ld SOIC - Wide	24	工业
AD7730BRU	量产	24 ld TSSOP	24	工业
AD7730BRU-REEL7	量产	24 ld TSSOP	24	工业
AD7730BRUZ	量产	24 ld TSSOP	24	工业
AD7730BRUZ-REEL	量产	24 ld TSSOP	24	工业
AD7730BRUZ-REEL7	量产	24 ld TSSOP	24	工业
AD7730BRZ	量产	24 ld SOIC - Wide	24	工业
AD7730BRZ-REEL	量产	24 ld SOIC - Wide	24	工业
AD7730BRZ-REEL7	量产	24 ld SOIC - Wide	24	工业
EVAL-AD7730EBZ	量产	评估板	-	待定