AD7705:  3V/5V、1 mW、双通道差分、16位Σ-Δ ADC

AD7705和AD7706均是完整的16位低成本Σ-Δ模数转换器（ADC）,用于直流测量和低频交流测量应用,其具有低功耗（3 V时最大1 mW）特性,因而能用在环路供电、电池供电或本地供电的应用中。片内可编程增益放大器提供从1至128的增益设置,无需使用外部信号调节硬件便可接受低电平和高电平模拟输入。

AD7705拥有两个差分通道,而AD7706则拥有一个差分通道和两个伪差分通道。在定制比率应用器件时,差分基准电压输入还能提供极大的灵活性。

The AD7705 and AD7706 are complete 16-bit, low-cost, Sigma Delta ADCs intended for dc and low-frequency ac measurement applications. Their low power (1 mW max @ 3 V) allows them to be used in loop-powered, battery-powered or locally-powered applications. The on-chip Programmable Gain Amplifier with gain settings from I through 128 can accommodate both low-level and high-level analog inputs with no external signal conditioning hardware.

The AD7705 has two differential channels while the AD7706 has one differential and two pseudo-differential channels. Differential reference inputs also allow maximum flexibility in tailoring the device for use in ratiometric applications.

AD7705 特点

• 两个全差分输入通道ADC
• 可编程增益前端
  增益范围从1至128
• 三线串行接口
  SPI®, QSPI™, MICROWIRE™, 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
• 3 V时最大功耗为1 mW
• 待机电流最大8 µA
• 16引脚DIP、16引脚SOIC和TSSOP封装
• Two Fully Differential Input Channel ADCs
• Programmable Gain Front End
  Gains from 1 to 128
• Three-Wire Serial Interface
  SPI®, QSPI™, MICROWIRE™ 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 µA max
• 16-Lead DIP, 16-Lead SOIC and TSSOP Packages

AD7705 技术指标

• Resolution (Bits): 16bit
• # Chan: 2
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip (Vref)/(PGA Gain),Uni (Vref)/(PGA Gain)
• ADC Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC,SOP

AD7705 建议配套产品

• Recommended Voltage References for the AD7705
  • For precision 2.5V applications with AVdd = 5V, we recommend AD780, REF43 or the REF192.
  • For precision 1.2V applications with AVdd = 3V, we recommend the AD589, AD1580 or the ADR512.
• Recommended Digital Isolators for the AD7705
  • For optocoupler alternatives, see our digital isolator selection tables, ADuMxxxx.
  • For process control applications, we recommend the ADuM1400 and the ADuM1200 icoupler.
  • For cost sensitive designs, we recommend the ADuM7440, ADuM7441 or ADuM7442.
• For digital isolators with integrated isolated power, we suggest the ADuM5401, ADuM5402 or the ADuM5403.
• For isolated USB designs in healthcare and industrial control, we recommend the ADuM4160.
• Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.
  • For selecting supervisor products, use the Supervisor Parametric Search.

AD7705 功能框图

AD7705 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7705BN	Prodn	16 ld PDIP	16	工业
AD7705BNZ	Prodn	16 ld PDIP	16	工业
AD7705BR	Prodn	16 ld SOIC - Wide	16	工业
AD7705BR-REEL	Prodn	16 ld SOIC - Wide	16	工业
AD7705BR-REEL7	Prodn	16 ld SOIC - Wide	16	工业
AD7705BRU	Prodn	16 ld TSSOP	16	工业
AD7705BRU-REEL	Prodn	16 ld TSSOP	16	工业
AD7705BRU-REEL7	Prodn	16 ld TSSOP	16	工业
AD7705BRUZ	Prodn	16 ld TSSOP	16	工业
AD7705BRUZ-REEL	Prodn	16 ld TSSOP	16	工业
AD7705BRUZ-REEL7	Prodn	16 ld TSSOP	16	工业
AD7705BRZ	Prodn	16 ld SOIC - Wide	16	工业
AD7705BRZ-REEL	Prodn	16 ld SOIC - Wide	16	工业
AD7705BRZ-REEL7	Prodn	16 ld SOIC - Wide	16	工业
EVAL-AD7705EBZ	Prodn	EVALUATION BOARDS	-	工业

AD7705 应用技术支持与电子电路设计开发资源下载

1. AD7705 数据手册DataSheet下载 .PDF
2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
3. ADC模数转换器选型指南 . PDF