AD7450: 差分输入、1 MSPS、12位SAR ADC
AD7450是一款12位、高速、低功耗、逐次逼近型(SAR)模数转换器(ADC),采用全差分模拟输入,工作电压为3 V或5 V单电源,最高吞吐量分别可达833 kSPS或1 MSPS。
该器件内置一个低噪声、宽带宽、差分采样保持(T/H)放大器,可处理1 MHz以上的输入频率,-3 dB带宽典型值为20 MHz。AD7450的外部基准电压通过VREF引脚输入,可在100 mV至3.5 V范围内变化,具体取决于电源和应用。基准电压值决定器件的共模电压范围。利用这一真差分输入结构和可变基准电压输入,用户可以选择各种输入范围和偏置点。转换过程和数据采集通过/CS与串行时钟进行控制,从而为器件与微处理器或DSP接口创造了条件。输入信号在/CS的下降沿进行采样,而转换同时在此处启动。该器件采用SAR架构,确保不会存在流水线延迟。AD7450采用先进的设计技术,可在高吞吐量的情况下实现极低的功耗.
The AD7450 is a 12-bit, high speed, low power, successive-approximation (SAR) analog-to-digital converter featuring a fully differential analog input. It operates from a single 3 V or 5 V power supply and features throughput rates up to 833 kSPS or 1 MSPS respectively.
This part contains a low-noise, wide bandwidth, differential track and hold amplifier (T/H) which can handle input frequencies in excess of 1 MHz with the –3 dB point being 20 MHz typically. The reference voltage for the AD7450 is applied externally to the VREF pin and can be varied from 100 mV to 3.5 V depending on the power supply and what suits the application. The value of the reference voltage determines the common mode voltage range of the part. With this truly differential input structure and variable reference input, the user can select a variety of input ranges and bias points.
The conversion process and data acquisition are controlled using CS and the serial clock allowing the device to interface with Microprocessors or DSPs. The input signals are sampled on the falling edge of CS and the conversion is also initiated at this point. The SAR architecture of this part ensures that there are no pipeline delays.
AD7450 特点
- 高吞吐量：1 MSPS
- 额定电压(VDD)：3 V和5 V
- 低功耗（最大呑吐量时）：
- 最大3.75mW（833 kSPS,3 V电源）
- 最大9 mW（1 MSPS,5 V电源） - 全差分模拟输入
- 灵活的功耗/串行时钟速度管理
- 可变基准电压输入
- 宽输入带宽：信纳比：70 dB（300 kHz输入频率）
- 无流水线延迟
- 高速串行接口- SPI(R)/QSPITM/MicroWireTM/DSP 兼容
- 省电模式：最大1uA
- Fast Throughput Rate: 1 MSPS
- Specified for VDD of 3 V and 5 V
- Low Power at max Throughput Rate:
- 3.75 mW max at 833 kSPS with 3 V Supplies
- 9 mW max at 1MSPS with 5 V Supplies - Fully Differential Analog Input
- Flexible Power/Serial Clock Speed Management
- Variable Reference Input
- Wide Input Bandwidth: 70dB SINAD at 300kHz Input Frequency
- No Pipeline Delays
- High Speed Serial Interface- SPI(R)/QSPITM/MicroWireTM/DSP Compatible
- Powerdown Mode: 1uA max
AD7450 技术指标
- Resolution (Bits): 12bit
- # Chan: 1
- Sample Rate: 1MSPS
- Interface: Ser
- Analog Input Type: Diff-Uni
- Ain Range: (2Vref) p-p
- ADC Architecture: SAR
- Pkg Type: SOIC,SOP
AD7450 功能框图
AD7450 芯片订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7450ARMZ | 量产 | 8 ld MSOP | 8 | 工业 |
| AD7450ARMZ-REEL7 | 量产 | 8 ld MSOP | 8 | 工业 |
| AD7450ARZ | 量产 | 8 ld SOIC | 8 | 工业 |
| AD7450ARZ-REEL | 量产 | 8 ld SOIC | 8 | 工业 |
| AD7450ARZ-REEL7 | 量产 | 8 ld SOIC | 8 | 工业 |
| AD7450BRMZ | 量产 | 8 ld MSOP | 8 | 工业 |
| AD7450BRZ | 量产 | 8 ld SOIC | 8 | 工业 |
| EVAL-AD7450CBZ | 量产 | 评估板 | - | 待定 |
AD7450 应用技术支持与电子电路设计开发资源下载
- AD7450 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