AD7812: 10位、8通道、350 kSPS、串行ADC
AD7811和AD7812均为高速、低功耗、10位模数转换器（ADC），采用2.7 V至5.5 V单电源供电。这些器件内置一个2.3 微秒（us）逐次逼近型模数转换器、一个片内采样保持放大器、一个2.5 V片内基准电压源和一个高速串行接口，该串行接口与大多数数字信号处理器（DSP）和微控制器的串行接口兼容。用户也可选择采用外部基准电压，将它与VREF引脚相连，并在控制寄存器中设置EXTREF位。VREF引脚可与VDD引脚相连。吞吐量较低时，可以利用省电模式在转换之间自动关断。
利用AD7811和AD7812的控制寄存器，可以将输入通道配置为单端或伪差分输入。该控制寄存器还具有软件转换启动与软件关断特性。两个此类器件可以共享同一串行总线，并可以在多封装应用中通过器件地址引脚硬连线分别寻址。AD7811提供三种封装：16引脚、0.3英寸宽、小型塑料双列直插式封装（小型DIP）；16引脚、0.15英寸宽、小形集成封装（SOIC）；以及16引脚超薄紧缩小型封装（TSSOP）。AD7812也提供三种封装：20引脚、0.3英寸宽、小型塑料双列直插式封装（小型DIP）；20引脚、小形集成封装（SOIC）；以及20引脚超薄紧缩小型封装（TSSOP）。
The AD7811 and AD7812 are high speed, low power, 10-bit A/D converters that operate from a single 2.7 V to 5.5 V supply. The devices contain a 2.3 us successive approximation A/D converter, an on-chip track/hold amplifier, a 2.5 V on-chip reference and a high speed serial interface that is compatible with the serial interfaces of most DSPs (Digital Signal Processors) and microcontrollers. The user also has the option of using an external reference by connecting it to the VREF pin and setting the EXTREF bit in the control register. The VREF pin may be tied to VDD. At slower throughput rates the power-down mode may be used to automatically power down between conversions.
The control registers of the AD7811 and AD7812 allow the input channels to be configured as single-ended or pseudo differential. The control register also features a software convert start and a software power-down. Two of these devices can share the same serial bus and may be individually addressed in a multipackage application by hardwiring the device address pin. The AD7811 is available in a small, 16-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a 16-lead 0.15" wide, small outline IC (SOIC) and in a 16-lead, Thin Shrink Small Outline Package (TSSOP). The AD7812 is available in a small, 20-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a 20-lead, small outline IC (SOIC) and in a 20-lead, Thin Shrink Small Outline Package (TSSOP).
AD7812 特点
- 10位ADC，转换时间为2.3微秒
- AD7812拥有8个单端输入，可配置为相对于1个共用输入的7个伪差分输入，或配置为4个独立伪差分通道
- 片上采样保持
- 片上基准电压源：2.5 V ± 2.5%
- 工作电压范围：2.7 V至5.5 V
- 额定电压范围：2.7 V至3.6 V及5 V±10%
- DSP/微控制器兼容串行接口
- 高速采样模式和自动省电模式
- 利用AD7811和AD7812上的封装地址引脚
- 可在多封装应用中共享串行总线
- 输入信号范围：0 V至VREF
- 基准电压输入范围：1.2 V至VDD
- 10-Bit ADC with 2.3 us Conversion Time
- The AD7812 has Eight Single-Ended Inputs that Can Be Configured as Seven
- Pseudo Differential Inputs with Respect to a Common, or as Four
- Independent Pseudo Differential Channels
- Onboard Track and Hold
- Onboard Reference 2.5 V ± 2.5%
- Operating Supply Range: 2.7 V to 5.5 V
- Specifications at 2.7 V-3.6 V and 5 V ± 10%
- DSP-/Microcontroller-Compatible Serial Interface
- High Speed Sampling and Automatic Power-Down Modes
- Package Address Pin on the AD7811 and AD7812 Allows
- Sharing of Serial Bus in Multipackage Applications
- Input Signal Range: 0 V to VREF
- Reference Input Range: 1.2 V to VDD
AD7812 技术指标
- Resolution (Bits): 10bit
- # Chan: 8
- Sample Rate: 350kSPS
- Interface: Ser
- Analog Input Type: SE-Uni,Diff-Uni
- Ain Range: Uni (Vref),(Vref) p-p
- ADC Architecture: SAR
- Pkg Type: SOIC,DIP,SOP
AD7812 功能框图
AD7812 芯片订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7812WYRUZ | 量产 | 20 ld TSSOP | 20 | 商业 |
| AD7812YNZ | 量产 | 20 ld PDIP | 20 | 商业 |
| AD7812YR | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7812YR-REEL | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7812YR-REEL7 | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7812YRU | 量产 | 20 ld TSSOP | 20 | 商业 |
| AD7812YRU-REEL7 | 量产 | 20 ld TSSOP | 20 | 商业 |
| AD7812YRUZ | 量产 | 20 ld TSSOP | 20 | 商业 |
| AD7812YRUZ-REEL | 量产 | 20 ld TSSOP | 20 | 商业 |
| AD7812YRUZ-REEL7 | 量产 | 20 ld TSSOP | 20 | 商业 |
| AD7812YRZ | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7812YRZ-REEL | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7812YRZ-REEL7 | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
AD7812 应用技术支持与电子电路设计开发资源下载
- AD7812 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