AD7440: 差分输入、1 MSPS、12 位ADC (AD7450A) 和10位ADC (AD7440)

The AD7450A/AD7440 are respectively 12- and 10-bit, high speed, low power, successive-approximation (SAR) analog-to-digital converters that feature a fully differential analog input. These parts operate from a single 3 V or 5 V power supply and feature throughput rates up to 1 MSPS.The parts 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 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.

AD7450A/AD7440分别是12位和10位、高速、低功耗、逐次逼近(SAR)型模数转换器(ADC),采用全差分模拟输入,工作电压为3 V或5 V单电源,最高呑吐量可达1 MSPS。这些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,-3dB带宽典型值为20MHz。 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。

AD7440 特点

• Fast Throughput Rate: 1 MSPS
• Specified for VDD of 3 V and 5 V
• Low Power at Max Throughput Rate:
  - 4 mW max at 1 MSPS with 3 V Supplies
  - 9.25 mW max at 1 MSPS with 5 V Supplies
• Fully Differential Analog Input
• Flexible Power/Serial Clock Speed Management
• Wide Input Bandwidth: 70 dB SINAD at 100 kHz Input Frequency
• No Pipeline Delays
• High Speed Serial Interface- SPI®/QSPI™/MICROWIRE™/ DSP Compatible
• Power-Down Mode: 1 µA max
• 8 Lead SOT-23 and µSOIC Packages
• 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4 mW（1 MSPS,3 V电源）
  - 最大9.25 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
• 宽输入带宽： 70 dB信纳比（100 kHz输入频率）
• 无流水线延迟
• 高速串行接口- SPI®/QSPI™/MICROWIRE™/ DSP 兼容
• 省电模式：最大1 µA
• 8引脚SOT-23和µSOIC封装

AD7440 技术指标

• Resolution (Bits): 10bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• ADC Architecture: SAR
• Pkg Type: SOT

AD7440 建议配套产品

• Recommended Driver Amplifiers for the AD7440
  • For ultra low distortion, low power differential amplifier, we recommend the ADA4940-1.
  • For low noise, low cost, precision amplifier, we recommend the AD8655 or the dual AD8656.
• Recommended Precision Voltage References for the AD7440
  • For a 2.5V/3V reference, we recommend the AD780.
  • For a 2.5V reference, we recommend the ADR421 or the ADR441.
  • For a 2.048V reference, we recommend the ADR420 or the ADR440.
• Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.
  • For selecting supervisor products, use the Supervisor Parametric Search.

AD7440 功能框图

AD7440 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7440BRM-REEL7	量产	8 ld MSOP	8	工业
AD7440BRMZ	量产	8 ld MSOP	8	工业
AD7440BRTZ-R2	量产	8 ld SOT-23	8	工业
AD7440BRTZ-REEL7	量产	8 ld SOT-23	8	工业
EVAL-AD7440CB	量产	评估板	-	待定

AD7440 应用技术支持与电子电路设计开发资源下载

1. AD7440 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