GENERAL DESCRIPTION

The AD7440/AD7450A1 are 10-bit and 12-bit high speed, low power, successive approximation (SAR) analog-to-digital converters with a fully differential analog input. These parts operate from a single 3 V or 5 V power supply and use advanced design techniques to achieve very low power dissipation at throughput rates up to 1 MSPS. The SAR architecture of these parts ensures that there are no pipeline delays.

The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier (T/H) that can handle input frequencies up to 3.5 MHz. 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.

FEATURES

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

Wide input bandwidth

70 dB SINAD at 100 kHz input frequency

Flexible power/serial clock speed management

No pipeline delays

High speed serial interface

SPI®/QSPI™/MICROWIRE™/DSP compatible

Power-down mode: 1 μA max

8-lead SOT-23 and MSOP packages

APPLICATIONS

Transducer interface

Battery-powered systems

Data acquisition systems

Portable instrumentation

Motor control

AD7450A属于集成电路（IC） > 模数转换器（ADC）。亚德诺半导体技术有限公司制造生产的AD7450A模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。