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AD7450AR Datasheet(PDF) 1 Page - Analog Devices |
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AD7450AR Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page REV. PrJ 27/02/02 PreliminaryTechnicalData PRELIMINARY TECHNICAL DATA Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7450 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 Differential Input, 1MSPS, 12-Bit ADC in µSO-8 and S0-8 FEATURES Fast Throughput Rate: 1MSPS Specified for VDD of 3 V and 5 V Low Power at max Throughput Rate: 3 mW typ at 833kSPS with 3 V Supplies 8 mW typ at 1MSPS with 5 V Supplies Fully Differential Analog Input Wide Input Bandwidth: 70dB SINAD at 300kHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High Speed Serial Interface - SPITM/QSPITM/ MicroWireTM/ DSP Compatible Powerdown Mode: 1µA max 8 Pin µSOIC and SOIC Packages APPLICATIONS Transducer Interface Battery Powered Systems Data Acquisition Systems Portable Instrumentation Motor Control Communications GENERAL DESCRIPTION The AD7450 is a 12-bit, high speed, low power, succes- sive-approximation (SAR) analog-to-digital converter featuring a fully differential analog input. It operates from a single 3 V or 5 V power supply and features throughput rates up to 833kSPS or 1MSPS respectively. This part contains a low-noise, wide bandwidth, differen- tial 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 for the AD7450 is applied externally to the VREF pin and can be varied from 100 mV to 2.5 V depending on the power supply and to suit the application. The value of the refer- ence 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 inter- face with Microprocessors or DSPs. The input signals are sampled on the falling edge of CS and the conversion is also initiated at this point. FUNCTIONAL BLOCK DIAGRAM The SAR architecture of this part ensures that there are no pipeline delays. The AD7450 uses 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 AD7450 offers 3mW typ power consumption for 833kSPS 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. This part also features 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 and once off conversion control. 8. ENOB > 8 bits typ with 100mV Reference. MicroWire is a trademark of National Semiconductor Corporation. SPI and QSPI are trademarks of Motorola, Inc. 12-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC AD7450 VIN+ VIN- VREF GND SCLK SDATA CS VDD T/H |
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