AD7707:适合低频测量应用的完整模拟前端

AD7707: 适合低频测量应用的完整模拟前端

AD7707是一款适合低频测量应用的完整模拟前端。这款3通道器件既可以直接从传感器接受低电平输入信号,也可以接受高电平（±10 V）信号,并产生串行数字输出。该器件采用Σ-转换技术,可实现最高16位无失码性能。选定的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。调制器输出由片内数字滤波器处理。此数字滤波器的第一个陷波可通过片内控制寄存器进行编程,以便对滤波器截止和输出更新速率进行调整。

The AD7707 is a complete analog front end for low frequency measurement applications. This three-channel device can accept either low level input signals directly from a transducer or high level (±10 V) signals and produce a serial digital output. It employs a sigma-delta conversion technique to realize up to 16 bits of no missing codes performance. The selected input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via an on-chip control register allowing adjustment of the filter cutoff and output update rate.

AD7707 特点

电荷平衡ADC
- 16位无失码
- 0.003%非线性度
高电平（±10 V）和低电平（±10 mV）输入通道
低电平输入通道上具有真双极性±100 mV能力,无需电荷泵
可编程增益前端,增益范围：1至128
三线式串行接口
- SPI(R), QSPITM, MICROWIRETM, DSP 兼容
- SCLK上可接受施密特触发器输入
提供模拟输入缓冲
工作电压：2.7 V至3.3 V或4.75 V至5.25 V
功耗：最大1 mW（3 V）
待机电流：最大8 uA
20引脚SOIC和TSSOP封装
Charge Balancing ADC
- 16 Bits No Missing Codes
- 0.003% Nonlinearity
High Level (±10 V) and Low Level (±10 mV) Input Channels
True Bipolar ±100 mV Capability on Low Level Input Channels Without Requiring Charge Pumps
Programmable Gain Front End Gains from 1 to 128
Three-Wire Serial Interface
- SPI(R), QSPITM, MICROWIRETM and DSP Compatible
- Schmitt Trigger Input on SCLK
Ability to Buffer the Analog Input
2.7 V to 3.3 V or 4.75 V to 5.25 V Operation
Power Dissipation 1 mW max @ 3 V
Standby Current 8 uA max
20-Lead SOIC and TSSOP Packages

AD7707 技术指标

Resolution (Bits): 16bit
# Chan: 3
Sample Rate: n/a
Interface: Ser,SPI
Analog Input Type: Diff-Uni,SE-Bip
Ain Range: Bip (Vref)/(PGA Gain),Bip 10V,Bip 5.0V,Uni (Vref)/(PGA Gain),Uni 10V,Uni 5.0V
ADC Architecture: Sigma-Delta
Pkg Type: SOIC,SOP

AD7707 功能框图

AD7707 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7707BR	Prodn	20 ld SOIC - Wide	20	工业
AD7707BR-REEL	Prodn	20 ld SOIC - Wide	20	工业
AD7707BR-REEL7	Prodn	20 ld SOIC - Wide	20	工业
AD7707BRU	Prodn	20 ld TSSOP	20	工业
AD7707BRU-REEL7	Prodn	20 ld TSSOP	20	工业
AD7707BRUZ	Prodn	20 ld TSSOP	20	工业
AD7707BRUZ-REEL	Prodn	20 ld TSSOP	20	工业
AD7707BRUZ-REEL7	Prodn	20 ld TSSOP	20	工业
AD7707BRZ	Prodn	20 ld SOIC - Wide	20	工业
AD7707BRZ-REEL	Prodn	20 ld SOIC - Wide	20	工业
AD7707BRZ-REEL7	Prodn	20 ld SOIC - Wide	20	工业
EVAL-AD7707EB	Prodn	EVALUATION BOARDS	-	TBD