AD7440 Datasheet | Analog Devices

FEATURES Fast Throughput Rate: 1MSPS Specified for VDD of 3 V and 5 V Low Power at max Throughput Rate: 3.75 m W typ at 1MSPS with 3 V Supplies 9 m W typ at 1MSPS with 5 V Supplies Fully Differential Analog Input Wide Input Bandwidth: 70d B SINAD at 200k Hz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High Speed Serial Interface - SPI TM /QSPI TM / MICROWIRE T M / DSP patible Power-Down Mode: 1µA max 8 Lead SOT-23 and MSOP Packages APPLICATIONS Transducer Interface Battery Powered Systems Data Acquisition Systems Portable Instrumentation Motor Control munications GENERAL DESCRIPTION Differential Input, 1MSPS, 12- & 10-Bit ADCs in 8-lead SOT-23 AD7450A/AD7440 FUNCTIONAL BLOCK DIAGRAM VIN+ VINVREF T/H 12-BIT SUCCESSIVE APPROXIMATION ADC SCLK AD7450A/ AD7440 CONTROL LOGIC SDATA +5 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 1MSPS. The parts contains a low-noise, wide bandwidth, differential track and hold amplifier (T/H) which can handle input frequencies in excess of 1MHz with the -3d B point being 20MHz typically. The reference voltage is applied externally to the VREF pin and can be varied from 100 m V to 3.5 V depending on the power supply and what suits the application. The value of the reference voltage determines the mon 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. The conversion process and data acquisition are controlled using CS and the serial clock allowing the device to interface with Microprocessors or DSPs. The input signals are sampled on the falling edge of CS and the conversion is also initiated at this point. MICROWIRE is a trademark of National...