AD7782:双通道、只读、引脚配置、24位Σ-Δ型ADC

AD7782: 双通道、只读、引脚配置、24位Σ-Δ型ADC

AD7782和AD7783均为24位、低成本、低功耗Σ-Δ型ADC,适合直流和低频交流测量应用。二者均为只读ADC,无可写寄存器,这使得ADC与控制器之间的接口非常简单。由于这些器件的功耗很低,因此可以采用环路供电、电池供电或本地供电方式。双设置片内可编程增益放大器（PGA）无需外部信号调理硬件,便可处理低电平或高电平模拟输入。工作选项可通过引脚编程（非软件编程）来实现。

The AD7782 and AD7783 are 24-bit low cost, low power Sigma Delta ADCs intended for dc and low frequency ac measurement applications. They are Read-only ADCs and have no writeable registers. This leads to a very simple interface between ADC and controller. Since their power consumption is low, the devices can be loop powered, battery powered or locally powered. The two-setting on-chip PGA can accommodate either a low-level or high-level analog input with no external signal conditioning hardware. Operating options are pin-programmable, not software programmable.

AD7782 特点

双通道、24位Σ-Δ型ADC引脚可配置（无可编程寄存器）;引脚可选择输入通道;引脚可编程输入范围（±2.56 V或±160 mV）
更新速率：19.79 Hz（固定值）
50 Hz和60 Hz同时抑制
24位无失码
18.5位峰－峰值分辨率（±2.56 V范围）
片上轨到轨输入缓冲和PGA
16.5位峰－峰值分辨率（±160 mV范围）
接口主/从工作模式从模式：三线式串行接口SPI®、QSPI™、MICROWIRE™、DSP兼容SCLK上为施密特触发器
功耗
额定工作电压：3 V和5 V（单电源）
正常模式：1.3 mA （3 V时）
省电模式：9 µA
2-Channel, 24-Bit Σ-Δ ADC
Pin Configurable (No Programmable Registers)
Pin Selectable Input Channels
Pin Programmable Input Ranges (±2.56 V or ±160 mV)
Fixed 19.79 Hz Update Rate
Simultaneous 50 Hz and 60 Hz Rejection
24-Bit No Missing Codes
18.5-Bit p-p Resolution (±2.56 V Range)
On-Chip Functions Rail-Rail Input Buffer and PGA
16.5-Bit p-p Resolution (±160 mV Range)
Interface
Master or Slave Mode of Operation
Slave Mode:
3-Wire Serial
SPI®, QSPI™, MICROWIRE™, and DSP-Compatible
Schmitt Trigger on SCLK
Power
Specified for Single 3 V and 5 V Operation
Normal: 1.3 mA @ 3 V
Power-Down: 9 µA

AD7782 技术指标

Resolution (Bits): 24bit
# Chan: 2
Sample Rate: 4.2MSPS
Interface: Ser,SPI
Analog Input Type: Diff-Bip
Ain Range: 0.32 V p-p,5.12 V p-p
ADC Architecture: Sigma-Delta
Pkg Type: SOP

AD7782 功能框图

AD7782 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7782BRU	Prodn	16 ld TSSOP	16	工业
AD7782BRU-REEL	Prodn	16 ld TSSOP	16	工业
AD7782BRU-REEL7	Prodn	16 ld TSSOP	16	工业
AD7782BRUZ	Prodn	16 ld TSSOP	16	工业
AD7782BRUZ-REEL	Prodn	16 ld TSSOP	16	工业
AD7782BRUZ-REEL7	Prodn	16 ld TSSOP	16	工业
EVAL-AD7782EB	Prodn	EVALUATION BOARDS	-	待定