AD7703: 20位Σ-Δ ADC
AD7703是一款使用Σ-Δ转换技术的20位模数转换器（ADC）。通过一个模拟调制器对模拟输入进行连续采样,模拟调制器的平均输出占空比与输入信号成比例关系。调制器输出由含六极点高斯响应的片内数字滤波器进行处理,该滤波器使用20位二进制字以最高4 kHz的字速率更新输出数据寄存器。采样速率、滤波器转折频率和输出字速率由主时钟输入设置,主时钟输入可由外部提供,或可由片内闸门振荡器提供。该ADC固有的线性度非常出色,端点精度由零和满量程的自动校准来保证,自动校准可以随时启动。自动校准方案也可以被扩展用来校准系统零点偏置和输入通道中的增益误差。输出数据可通过一个串行端口来访问,该端口具有两种同步模式,适合与移位寄存器或工业标准微控制器的串行端口进行接口。CMOS结构可确保低功耗,而且省电模式可将空闲时的功耗降至仅10 µW。
The AD7703 is a 20-bit ADC which uses a sigma delta conversion technique. The analog input is continuously sampled by an analog modulator whose mean output duty cycle is proportional to the input signal. The modulator output is processed by an on-chip digital filter with a six-pole Gaussian response, which updates the output data register with 20-bit binary words at word rates up to 4kHz. The sampling rate, filter corner frequency and output word rate are set by a master clock input that may be supplied externally, or by an on-chip gate oscillator.The inherent linearity of the ADC is excellent, and endpoint accuracy is ensured by self-calibration of zero and full scale which may be initiated at any time. The self-calibration scheme can also be extended to null system offset and gain errors in the input channel.The output data is accessed through a serial port, which has two synchronous modes suitable for interfacing to shift registers or the serial ports of industry standard microcontrollers.
AD7703 特点
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AD7703 技术指标
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AD7703 芯片订购指南
| 产品型号 | 封装 | 引脚 | 温度范围 | 包装和数量 | 报价*(100-499) | 报价*1000 pcs |
|---|---|---|---|---|---|---|
| AD7703AN 产品状态: 量产 | 20 ld PDIP | 20 | 工业 | Tube, 18 | $ 23.29 | $ 19.76 |
| AD7703ANZ 产品状态: 量产 | 20 ld PDIP | 20 | 工业 | Tube, 18 | $ 21.86 | $ 18.54 |
| AD7703AR 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Tube, 37 | $ 22.62 | $ 19.26 |
| AD7703AR-REEL 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Reel, 1000 | - | $ 19.26 |
| AD7703ARZ 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Tube, 37 | $ 21.21 | $ 18.07 |
| AD7703BN 产品状态: 量产 | 20 ld PDIP | 20 | 商业 | Tube, 18 | $ 29.07 | $ 24.72 |
| AD7703BNZ 产品状态: 量产 | 20 ld PDIP | 20 | 商业 | Tube, 18 | $ 25.99 | $ 22.08 |
| AD7703BR 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Tube, 37 | $ 26.88 | $ 22.86 |
| AD7703BR-REEL 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Reel, 1000 | - | $ 22.86 |
| AD7703BRZ 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Tube, 37 | $ 25.22 | $ 21.44 |
| AD7703BRZ-REEL 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Reel, 1000 | - | $ 21.44 |
| AD7703CNZ 产品状态: 量产 | 20 ld PDIP | 20 | 商业 | Tube, 18 | $ 33.48 | $ 28.46 |
| AD7703CR 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Tube, 37 | $ 34.64 | $ 29.46 |
| AD7703CR-REEL 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Reel, 1000 | - | $ 29.46 |
| AD7703CRZ 产品状态: 量产 | 20 ld SOIC - Wide | 20 | 工业 | Tube, 37 | $ 32.51 | $ 27.64 |
