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AD7450ABRM Datasheet(PDF) 1 Page - Analog Devices |
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AD7450ABRM Datasheet(HTML) 1 Page - Analog Devices |
1 / 28 page Differential Input, 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23 AD7440/AD7450A Rev. B 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2004 Analog Devices, Inc. All rights reserved. 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 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. 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 FUNCTIONAL BLOCK DIAGRAM VREF T/H CONTROL LOGIC 12-BIT SUCCESSIVE APPROXIMATION ADC GND SCLK SDATA CS VDD AD7440/AD7450A VIN+ VIN– Figure 1. on the falling edge of CS; the conversion is also initiated at this point. The SAR architecture of these parts ensures that there are no pipeline delays. The AD7440 and the AD7450A use ad- vanced 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 3 V supply, the AD7440/AD7450A offer 4 mW max power consumption for 1 MSPS 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 and once-off conversion control. 8. ENOB > eight bits typically with 100 mV reference. 1 Protected by U.S. Patent Number 6,681,332. |
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