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AD7450A Dataheets PDF



Part Number AD7450A
Manufacturers Analog Devices
Logo Analog Devices
Description ADC
Datasheet AD7450A DatasheetAD7450A Datasheet (PDF)

PRELIMINARY TECHNICAL DATA a Preliminary Technical Data FEATURES Fast Throughput Rate: 1MSPS Specified for VDD of 3 V and 5 V Low Power at max Throughput Rate: 3.75 mW typ at 1MSPS with 3 V Supplies 9 mW typ at 1MSPS with 5 V Supplies Fully Differential Analog Input Wide Input Bandwidth: 70dB SINAD at 200kHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High Speed Serial Interface - SPI TM /QSPI TM / MICROWIRE T M / DSP Compatible Power-Down Mode: 1µA max 8 Lea.

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PRELIMINARY TECHNICAL DATA a Preliminary Technical Data FEATURES Fast Throughput Rate: 1MSPS Specified for VDD of 3 V and 5 V Low Power at max Throughput Rate: 3.75 mW typ at 1MSPS with 3 V Supplies 9 mW typ at 1MSPS with 5 V Supplies Fully Differential Analog Input Wide Input Bandwidth: 70dB SINAD at 200kHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High Speed Serial Interface - SPI TM /QSPI TM / MICROWIRE T M / DSP Compatible 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 Communications GENERAL DESCRIPTION Differential Input, 1MSPS, 12- & 10-Bit ADCs in 8-lead SOT-23 AD7450A/AD7440 FUNCTIONAL BLOCK DIAGRAM VDD VIN+ VINVREF T/H 12-BIT SUCCESSIVE APPROXIMATION ADC SCLK AD7450A/ AD7440 CONTROL LOGIC SDATA +5 GND 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 -3dB point being 20MHz 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. 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 Semiconductor Corporation. SPI and QSPI are trademarks of Motorola, Inc. The SAR architecture of these parts ensures that there are no pipeline delays. The AD7450A and the AD7440 use advanced design techniques to achieve very low power dissipation at high throughput rates. PRODUCT HIGHLIGHTS 1.Operation with either 3 V or 5 V power supplies. 2.High Throughput with Low Power Consumption. With a 3V supply, the AD7450A/AD7440 offer 3.75mW typ power consumption for 1MSPS throughput. 3.Fully 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 Delay. 7.Accurate control of the sampling instant via a CS input.


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