AD7856: 5 V单电源、8通道、285 kSPS、14位串行采样ADC
AD7856是一款高速、低功耗、14位模数转换器（ADC），采用5 V单电源供电。当满足一组默认条件时，ADC上电，此时可作为只读ADC使用。该ADC含有自校准和系统校准选项，可确保操作精度不受时间和温度影响，还具有适合低功耗应用的多个省电选项。AD7856的吞吐量可达285 kHz。通过输入采样保持功能可在500 ns内采集一个信号，并采用伪差分采样方案。AD7856的电压范围为0至VREF，采用标准二进制和二进制补码两种输出编码。输入信号范围可至电源电压，而且该器件能够转换20 MHz的全功率信号。CMOS结构可确保获得低功耗，正常工作模式下的典型功耗为5.4 mW，省电模式下为3.6 uW。这款器件提供三种封装：24引脚、0.3英寸宽、双列直插式封装（DIP）；24引脚小形集成封装（SOIC）；以及24引脚紧缩小型封装（SSOP）。
The AD7856 is a high speed, low power, 14-bit Analog-to-Digital Converter (ADC) that operates from a single 5 V power supply. The ADC powers up with a set of default conditions at which time it can be operated as a read only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature; and it has a number of power-down options for low power applications.
The AD7856 is capable of 285 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7856 voltage range is 0 to VREF with both straight binary and 2s complement output coding. Input signal range is to the supply and the part is capable of converting full power signals to 20 MHz.CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 uW in power-down mode. The part is available in 24-pin, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages.
AD7856 特点
- 5 V单电源
- 吞吐量：285 kSPS
- 自校准和系统校准，上电时自动校准
- 8个单端输入或4个伪差分输入
- 低功耗：60 mW（典型值）
- 转换后自动关断（典型值2.5 uW）
- 灵活的串行接口：8051/SPI(R)/QSPITM/uP兼容
- 24引脚DIP、SOIC和SSOP封装
- Single 5 V Supply
- 285 kSPS Throughput Rate
- Self- and System Calibration with Autocalibration on Power-Up
- Eight Single-Ended or Four Pseudo-Differential Inputs
- Low Power: 60 mW Typ
- Automatic Power-Down After Conversion (2.5 uW Typ)
- Flexible Serial Interface: 8051/SPI(R)/QSPITM/uP Compatible
- 24-Lead DIP, SOIC and SSOP Packages
AD7856 技术指标
- Resolution (Bits): 14bit
- # Chan: 8
- Sample Rate: 285kSPS
- Interface: SPI,Ser
- Analog Input Type: SE-Uni
- Ain Range: Uni (Vref),(Vref) p-p
- ADC Architecture: SAR
- Pkg Type: DIP,SOIC,SOP
AD7856 功能框图
AD7856 芯片订购指南
| 产品型号 | 产品状态 | 封装 | Pins | 报价* (100-499) |
|---|---|---|---|---|
| AD7856AN | Prodn | 24 ld PDIP | 24 | $ 13.36 |
| AD7856ANZ | Prodn | 24 ld PDIP | 24 | $ 12.14 |
| AD7856AR | Prodn | 24 ld SOIC - Wide | 24 | $ 12.97 |
| AD7856AR-REEL | Prodn | 24 ld SOIC - Wide | 24 | - |
| AD7856AR-REEL7 | Prodn | 24 ld SOIC - Wide | 24 | - |
| AD7856ARS | Prodn | 24 ld SSOP | 24 | $ 12.97 |
| AD7856ARS-REEL | Prodn | 24 ld SSOP | 24 | - |
| AD7856ARS-REEL7 | 量产 | 24 ld SSOP | 24 | - |
| AD7856ARSZ | Prodn | 24 ld SSOP | 24 | $ 11.79 |
| AD7856ARSZ-REEL7 | Prodn | 24 ld SSOP | 24 | $ 11.79 |
| AD7856ARZ | Prodn | 24 ld SOIC - Wide | 24 | $ 11.79 |
| AD7856ARZ-REEL7 | Prodn | 24 ld SOIC - Wide | 24 | $ 11.79 |
| AD7856KR | Prodn | 24 ld SOIC - Wide | 24 | $ 15.58 |
| AD7856KR-REEL | Prodn | 24 ld SOIC - Wide | 24 | - |
| AD7856KR-REEL7 | Prodn | 24 ld SOIC - Wide | 24 | - |
| AD7856KRZ | Prodn | 24 ld SOIC - Wide | 24 | $ 14.17 |
AD7856 应用技术支持与电子电路设计开发资源下载
- AD7856 数据手册DataSheet下载. PDF
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
- ADC模数转换器选型指南 . PDF