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

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

AD7450A/AD7440分别是12位和10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,最高吞吐量为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,-3 dB带宽典型值为20 MHz。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。MICROWIRE是美国国家半导体公司的商标。SPI和QSPI是摩托罗拉公司的商标。

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 特点

高吞吐量：1 MSPS
额定电压(VDD)：3 V和5 V
低功耗（最大吞吐量时）：
- 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（300 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
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 300 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

AD7450A 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: SOP,SOT

AD7450A 建议配套产品

Recommended Driver Amplifiers for the AD7450A
- 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 Precision Voltage References for the AD7450A
- 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.

AD7450A 功能框图

AD7450A 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7450ABRM	量产	8 ld MSOP	8	工业
AD7450ABRM-REEL7	量产	8 ld MSOP	8	工业
AD7450ABRMZ	量产	8 ld MSOP	8	工业
AD7450ABRTZ-REEL7	量产	8 ld SOT-23	8	工业
EVAL-AD7450ACB	量产	评估板	-	待定