AD7730L: CMOS、24位、低功耗、Σ-Δ 型桥式传感器ADC
AD7730L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。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1/110,000,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。AD7730L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3 ppm/°C。该器件提供24引脚SOIC和24引脚TSSOP两种封装,它是AD7730的低功耗版本（功耗约为AD7730的1/3）。
The AD7730Lis 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 device 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 110,000 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 AD7730L 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 3 ppm/°C. The part is available in a 24-lead SOIC and 24-lead TSSOP package. It is a lower power version of the AD7730L (approximately 1/3 the power).
AD7730L 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
AD7730L 技术指标
- Resolution (Bits): 24bit
- # Chan: 2
- Sample Rate: 5MSPS
- Interface: Ser,SPI
- Analog Input Type: Diff-Bip,Diff-Uni
- Ain Range: (2Vref/PGA Gain) p-p,(Vref/PGA Gain) p-p
- ADC Architecture: Sigma-Delta
- Pkg Type: SOIC,SOP
AD7730L 功能框图
AD7730L 芯片订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7730LBR | Prodn | 24 ld SOIC - Wide | 24 | 工业 |
| AD7730LBR-REEL7 | Prodn | 24 ld SOIC - Wide | 24 | 工业 |
| AD7730LBRU | Prodn | 24 ld TSSOP | 24 | 工业 |
| AD7730LBRUZ | Prodn | 24 ld TSSOP | 24 | 工业 |
| AD7730LBRUZ-REEL | Prodn | 24 ld TSSOP | 24 | 工业 |
| AD7730LBRUZ-REEL7 | Prodn | 24 ld TSSOP | 24 | 工业 |
| AD7730LBRZ | Prodn | 24 ld SOIC - Wide | 24 | 工业 |
| AD7730LBRZ-REEL | Prodn | 24 ld SOIC - Wide | 24 | 工业 |
| EVAL-AD7730LEBZ | Prodn | EVALUATION BOARDS | - | 待定 |