AD7457:  伪差分输入、100 kSPS、12位ADC,采用8引脚SOT-23封装

AD7457是一款12位低功耗、逐次逼近型(SAR)模数转换器(ADC)，采用伪差分模拟输入，工作电压为2.7V至5.25V单电源，最高呑吐量可达100 kSPS。.xian { text-decoration: overline;} 该器件内置一个低噪声、宽带宽、差分采样/保持放大器(T/H)，可处理1 MHz以上的输入频率。AD7457的基准电压由外部施加于VREF引脚，电压范围为100mV至VDD，取决于具体应用。转换过程和数据采集过程通过CS和串行时钟进行控制，从而为器件与微处理器或DSP接口创造了条件。此类器件采用SAR架构，可确保无流水线延迟。AD7457采用先进的设计技术，可实现极低的功耗。

The AD7457 is a 12-bit, low power, successive-approximation (SAR) analog-to-digital converter that features a pseudo differential analog input. This part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 100 kSPS.The part contains a low-noise, wide bandwidth, differential track and hold amplifier (T/H) which can handle input frequencies in excess of 1 MHz. The reference voltage for the AD7457 is applied externally to the VREF pin and can range from 100mV to VDD, depending on what suits the application.The conversion process and data acquisition are controlled using and the serial clock allowing the device to interface with Microprocessors or DSPs.The SAR architecture of these parts ensures that there are no pipeline delays.The AD7457 uses advanced design techniques to achieve very low power dissipation

AD7457 特性

• 额定电压(VDD)：2.7 V至5.25 V
• 极低功耗：
  - 最大 0.9 mW（100 kSPS,VDD = 3V）
  - 最大 3 mW（100 kSPS,VDD = 5V）
• 伪差分模拟输入
• 信纳比：70 dB（30 kHz输入频率）
• 无流水线延迟
• 串行接口- SPI®/QSPI™/MICROWIRE™/DSP兼容
• 自动省电模式
• 8引脚SOT-23封装
• Specified for VDD of 2.7 V to 5.25 V
• Very Low Power:
  - 0.9 mW max at 100 kSPS with VDD = 3V
  - 3 mW max at 100 kSPS with VDD = 5V
• Pseudo Differential Analog Input
• 70 dB SINAD at 30 kHz Input Frequency
• No Pipeline Delays
• Serial Interface- SPI®/QSPI™/MICROWIRE™/DSP Compatible
• Automatic Power-Down Mode
• 8 Pin SOT-23

AD7457 技术指标

• Resolution (Bits): 12bit
• # Chan: 1
• Sample Rate: 100kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p
• ADC Architecture: SAR
• Pkg Type: SOT

AD7457 建议配套产品

• Recommended Driver Amplifiers for the AD7457
  • For low noise, low distortion, we recommend the ADA4940-1 differential amplifier.
  • For low noise, low cost precision amplifiers, we recommend the AD8655 or the dual AD8656.
• Recommended Voltage References for the AD7457
  • For low noise, high accuracy, we recommend the ADR421 or the AD780, 2.5V reference.
• Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.
  • For selecting supervisor products, use the Supervisor Parametric Search.

AD7457 功能框图

AD7457 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7457BRTZ-REEL7	量产	8 ld SOT-23	8	工业

AD7457 应用技术支持与电子电路设计开发资源下载

1. AD7457 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