전자부품 데이터시트 검색엔진 |
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AD7944 데이터시트(PDF) 1 Page - Analog Devices |
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AD7944 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page 3 mW, 100 kSPS, 14-Bit ADC in 6-Lead SOT-23 AD7940 Rev. 0 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: 100 kSPS Specified for VDD of 2.5 V to 5.5 V Low power 4 mW typ at 100 kSPS with 3 V supplies 17 mW typ at 100 kSPS with 5 V supplies Wide input bandwidth: 81 dB SINAD at 10 kHz input frequency Flexible power/serial clock speed management No pipeline delays High speed serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible Standby mode: 0.5 µA max 6-Lead SOT-23 and 8-Lead MSOP packages APPLICATIONS Battery-powered systems Personal digital assistants Medical instruments Mobile communications Instrumentation and control systems Remote data acquisition systems FUNCTIONAL BLOCK DIAGRAM VIN VDD GND AD7940 SCLK SDATA CS T/H 14-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC Figure 1. Table 1. 16-Bit and 14-Bit ADC (MSOP and SOT-23) Type 100 kSPS 250 kSPS 500 kSPS 16-Bit True Differential AD7684 AD7687 AD7688 16-Bit Pseudo Differential AD7683 AD7685 AD7686 16-Bit Unipolar AD7680 14-Bit True Differential AD7944 AD7947 14-Bit Pseudo Differential AD7942 AD7946 14-Bit Unipolar AD7940 GENERAL DESCRIPTION The AD79401 is a 14-bit, fast, low power, successive approxima- tion ADC. The part operates from a single 2.50 V to 5.5 V power supply and features throughput rates up to 100 kSPS. The part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 7 MHz. The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipelined delays associated with the part. The AD7940 uses advanced design techniques to achieve very low power dissipation at fast throughput rates. The reference for the part is taken internally from VDD, which allows the widest dynamic input range to the ADC. Thus, the analog input range for this part is 0 V to VDD. The conversion rate is determined by the SCLK frequency. 1 Protected by U.S. Patent No. 6,681,332. This part features a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once off conversion control. PRODUCT HIGHLIGHTS 1. First 14-bit ADC in a SOT-23 package. 2. High throughput with low power consumption. 3. Flexible power/serial clock speed management. The con- version rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock speed increase. This allows the average power consumption to be reduced when a power-down mode is used while not converting. The part also features a shutdown mode to maximize power efficiency at lower throughput rates. Power consumption is 0.5 µA max when in shutdown. 4. Reference derived from the power supply. 5. No pipeline delay. |
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유사한 설명 - AD7944 |
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