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AD7441: 伪差分输入、1 MSPS、10位ADC，采用8引脚SOT-23封装

The AD7441/AD7451* are, respectively, 10-/12-bit high speed, low power, single-supply, successive approximation (SAR), analog-to-digital converters (ADCs) that feature a pseudo differential analog input. These parts operate from a single 2.7 V to 5.25 V power supply and achieve very low power dissipation at high throughput rates of up to 1 MSPS.The AD7441/AD7451 contain a low noise, wide bandwidth, differential track-and-hold (T/H) amplifier that handles input frequencies up to 3.5 MHz. The reference voltage for these devices is applied externally to the VREF pin and can range from 100 mV to VDD, depending on the power supply and what suits the application.The conversion process and data acquisition are controlled using overbar: CS and the serial clock, allowing the device to interface with microprocessors or DSPs. The input signals are sampled on the falling edge of overbar: CS when the conversion is initiated. The SAR architecture of these parts ensures that there are no pipeline delays.

AD7441/AD7451*分别是10位和12位、高速、低功耗、单电源、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2.7 V至5.25 V单电源,最高吞吐量为1 MSPS,功耗极低。AD7441/AD7451内置一个低噪声、宽带宽、差分采样保持(T/H)放大器,可处理最高3.5 MHz的输入频率。外部基准电压通过VREF引脚输入,可在100 mV至VDD范围内变化,具体取决于电源和应用。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。这些器件采用SAR架构,可确保无流水线延迟.

AD7441 特点

• 高吞吐量：1 MSPS
• 额定电压(VDD)：2.7 V至5.25 V
• 低功耗（最大吞吐量时）：
  最大4 mW（1 MSPS、VDD= 3 V）
  最大9.25 mW（1 MSPS、VDD = 5 V）
• 宽输入带宽：70 dB信纳比（100 kHz输入频率）
• 伪差分模拟输入
• 灵活的功耗/串行时钟速度管理
• 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MSOP封装

AD7441 技术指标

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

AD7441 亮点

1. Operation with 2.7 V to 5.25 V Power Supplies.
2. High Throughput with Low Power Consumption. With a 3 V supply, the AD7441/AD7451 offer 4 mW maxi-mum power consumption for a 1 MSPS throughput rate.
3. Pseudo Differential Analog Input.
4. Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the power to be reduced as the conversion time is reduced through the serial clock speed increase. These parts also feature a shutdown mode to maximize power efficiency at lower throughput rates.
5. Variable Voltage Reference Input.
6. No Pipeline Delays.
7. Accurate Control of Sampling Instant via overbar: CS Input and Once-Off Conversion Control.
8. ENOB > 10 Bits Typically with 500 mV Reference.
9. 采用2.7 V至5.25 V电源供电。
10. 高吞吐量、低功耗。采用3 V电源时,AD7441/AD7451在1 MSPS吞吐量时的最大功耗为4 mW。
11. 伪差分模拟输入。
12. 灵活的功耗/串行时钟速度管理。转换速率由串行时钟确定,因此当串行时钟速度提高导致转换时间缩短时,功耗可降低。这些器件还提供关断模式,可在较低吞吐量下实现最高功效。
13. 可变基准电压源输入。
14. 无流水线延迟。
15. 通过/CS输入与一次性转换控制,可实现对采样时间的精确控制。
16. 采用500 mV基准电压时,ENOB典型值大于10位。

AD7441 应用领域

• 传感器接口
• 电池供电系统
• 数据采集系统
• 便携式仪器仪表

AD7441 建议配套产品

• Recommended Driver Amplifiers for the AD7441
  • 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 AD7441
  • 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.

AD7441 功能框图

AD7441 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7441BRMZ	量产	8 ld MSOP	8	工业
AD7441BRTZ-R2	量产	8 ld SOT-23	8	工业
AD7441BRTZ-REEL7	量产	8 ld SOT-23	8	工业
EVAL-AD7441CBZ	量产	评估板	-	待定

AD7441 应用技术支持与电子电路设计开发资源下载

1. AD7441 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