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AD7924BRUZ-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD7924BRUZ-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page 4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 16-Lead TSSOP Data Sheet AD7904/AD7914/AD7924 Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2002–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Fast throughput rate: 1 MSPS Specified for AVDD of 2.7 V to 5.25 V Low power: 6 mW maximum at 1 MSPS with 3 V supplies 13.5 mW maximum at 1 MSPS with 5 V supplies 4 single-ended inputs with sequencer Wide input bandwidth AD7924, 70 dB SNR at 50 kHz input frequency Flexible power/serial clock speed management No pipeline delays High speed serial interface: SPI/QSPI™/ MICROWIRE™/DSP compatible Shutdown mode: 0.5 µA maximum 16-lead TSSOP package Qualified for automotive applications FUNCTIONAL BLOCK DIAGRAM AGND SCLK DOUT DIN CS VDRIVE AVDD CONTROL LOGIC 8-/10-/12-BIT SUCCESSIVE APPROXIMATION ADC T/H REFIN VIN0 VIN3 VIN2 VIN1 I/P MUX AD7904/AD7914/AD7924 SEQUENCER Figure 1. GENERAL DESCRIPTION The AD7904/AD7914/AD7924 are, respectively, 8-bit, 10-bit, and 12-bit, high speed, low power, 4-channel successive approxi- mation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 8 MHz. The conversion process and data acquisition are controlled using CS and the serial clock signal, allowing the device to easily inter- face with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and conversion is initiated at this point. There are no pipeline delays associated with the part. The AD7904/AD7914/AD7924 use advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7904/AD7914/ AD7924 consume 2 mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 2.7 mA maximum. Through the configuration of the control register, the analog input range for the part can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7904/AD7914/AD7924 each feature four single- ended analog inputs with a channel sequencer to allow a pre- programmed selection of channels to be converted sequentially. The conversion time for the AD7904/AD7914/AD7924 is determined by the SCLK frequency, which is also used as the master clock to control the conversion. PRODUCT HIGHLIGHTS 1. High Throughput with Low Power Consumption. The AD7904/AD7914/AD7924 offer throughput rates up to 1 MSPS. At the maximum throughput rate with 3 V supplies, the AD7904/AD7914/AD7924 dissipate only 6 mW of power maximum. 2. Four Single-Ended Inputs with Channel Sequencer. A consecutive sequence of channels can be selected, through which the ADC will cycle and convert on. 3. Single-Supply Operation with VDRIVE Function. The AD7904/AD7914/AD7924 operate from a single 2.7 V to 5.25 V supply. The VDRIVE function allows the serial inter- face to connect directly to 3 V or 5 V processor systems, independent of VDD. 4. Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the conversion time to be reduced by increasing the serial clock speed. The parts also feature two shutdown modes to maximize power efficiency at lower throughput rates. Current consumption is 0.5 µA maximum when in full shutdown. 5. No Pipeline Delay. The parts feature a standard successive approximation ADC with accurate control of the sampling instant via the CS input and once-off conversion control. |
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