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AD7450ARMZ Datasheet(PDF) 1 Page - Analog Devices |
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AD7450ARMZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 22 page a 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com © Analog Devices, Inc., 2002 AD7450 Differential Input, 1 MSPS 12-Bit ADC in SOIC-8 and SO-8 SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corporation. FEATURES Fast Throughput Rate: 1 MSPS Specified for VDD of 3 V and 5 V Low Power at Max Throughput Rate: 3.75 mW Max at 833 kSPS with 3 V Supplies 9 mW Max at 1 MSPS with 5 V Supplies Fully Differential Analog Input Wide Input Bandwidth: 70 dB SINAD at 300 kHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High-Speed Serial Interface—SPITM/QSPITM MICROWIRETM/DSP Compatible Power-Down Mode: 1 A Max 8-Lead SOIC and SOIC Packages APPLICATIONS Transducer Interface Battery-Powered Systems Data Acquisition Systems Portable Instrumentation Motor Control Communications FUNCTIONAL BLOCK DIAGRAM 12-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC AD7450 VIN+ SCLK CS SDATA VIN– VREF GND VDD T/H GENERAL DESCRIPTION The AD7450 is a 12-bit, high-speed, low power, successive approximation (SAR) analog-to-digital converter that features a fully differential analog input. It operates from a single 3 V or 5 V power supply and features throughput rates up to 833 kSPS or 1 MSPS, respectively. This part contains a low noise, wide bandwidth, differential track- and-hold amplifier (T/H) that can handle input frequencies in excess of 1 MHz with the –3 dB point typically being 20 MHz. The reference voltage for the AD7450 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 and data acquisition processes 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. The SAR architecture of this part ensures that there are no pipeline delays. The AD7450 uses advanced design techniques to achieve 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 3 V supply, the AD7450 offers 3.75 mW max power consumption for 833 kSPS 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 typically with 100 mV reference. Rev. A Fax: 781/461/3113 |
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