4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 16-Lead TSSOP Data Sheet AD7904/AD7914/AD7924 FEATURES FUNCTIONAL BLOCK DIAGRAM AV DD Fast throughput rate: 1 MSPS Specified for AV of 2.7 V to 5.25 V DD REF IN Low power: V 0 IN 6 mW maximum at 1 MSPS with 3 V supplies T/H 8-/10-/12-BIT 13.5 mW maximum at 1 MSPS with 5 V supplies SUCCESSIVE V 1 APPROXIMATION IN 4 single-ended inputs with sequencer ADC I/P MUX Wide input bandwidth V 2 IN AD7924, 70 dB SNR at 50 kHz input frequency Flexible power/serial clock speed management V 3 IN No pipeline delays SCLK High speed serial interface: SPI/QSPI/ DOUT MICROWIRE/DSP compatible SEQUENCER CONTROL LOGIC DIN Shutdown mode: 0.5 A maximum CS 16-lead TSSOP package AD7904/AD7914/AD7924 Qualified for automotive applications V DRIVE AGND Figure 1. GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7904/AD7914/AD7924 are, respectively, 8-bit, 10-bit, and 1. High Throughput with Low Power Consumption. 12-bit, high speed, low power, 4-channel successive approxi- The AD7904/AD7914/AD7924 offer throughput rates mation ADCs. The parts operate from a single 2.7 V to 5.25 V up to 1 MSPS. At the maximum throughput rate with 3 V power supply and feature throughput rates up to 1 MSPS. The supplies, the AD7904/AD7914/AD7924 dissipate only parts contain a low noise, wide bandwidth track-and-hold 6 mW of power maximum. amplifier that can handle input frequencies in excess of 8 MHz. 2. Four Single-Ended Inputs with Channel Sequencer. A consecutive sequence of channels can be selected, The conversion process and data acquisition are controlled using through which the ADC will cycle and convert on. CS and the serial clock signal, allowing the device to easily inter- 3. Single-Supply Operation with V Function. DRIVE face with microprocessors or DSPs. The input signal is sampled The AD7904/AD7914/AD7924 operate from a single 2.7 V on the falling edge of CS and conversion is initiated at this to 5.25 V supply. The VDRIVE function allows the serial inter- point. There are no pipeline delays associated with the part. face to connect directly to 3 V or 5 V processor systems, The AD7904/AD7914/AD7924 use advanced design techniques independent of VDD. to achieve very low power dissipation at maximum throughput 4. Flexible Power/Serial Clock Speed Management. rates. At maximum throughput rates, the AD7904/AD7914/ The conversion rate is determined by the serial clock, AD7924 consume 2 mA maximum with 3 V supplies with 5 V allowing the conversion time to be reduced by increasing supplies, the current consumption is 2.7 mA maximum. the serial clock speed. The parts also feature two shutdown modes to maximize power efficiency at lower throughput Through the configuration of the control register, the analog rates. Current consumption is 0.5 A maximum when in input range for the part can be selected as 0 V to REFIN or 0 V to full shutdown. 2 REFIN, with either straight binary or twos complement output 5. No Pipeline Delay. coding. The AD7904/AD7914/AD7924 each feature four single- The parts feature a standard successive approximation ended analog inputs with a channel sequencer to allow a pre- ADC with accurate control of the sampling instant via programmed selection of channels to be converted sequentially. the CS input and once-off conversion control. 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. Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20022013 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 03087-001AD7904/AD7914/AD7924 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Circuit Information ........................................................................ 18 Functional Block Diagram .............................................................. 1 Converter Operation .................................................................. 18 General Description ......................................................................... 1 ADC Transfer Function ............................................................. 19 Product Highlights ........................................................................... 1 Typical Connection Diagram ................................................... 20 Revision History ............................................................................... 2 Modes of Operation ....................................................................... 22 Specifications ..................................................................................... 3 Normal Mode (PM1 = PM0 = 1) ............................................. 22 AD7904 Specifications ................................................................. 3 Full Shutdown Mode (PM1 = 1, PM0 = 0) ............................. 22 AD7914 Specifications ................................................................. 5 Auto Shutdown Mode (PM1 = 0, PM0 = 1) ........................... 22 AD7924 Specifications ................................................................. 7 Powering Up the AD7904/AD7914/AD7924 ......................... 23 Timing Specifications .................................................................. 9 Power vs. Throughput Rate ........................................................... 25 Absolute Maximum Ratings .......................................................... 10 Serial Interface ............................................................................ 25 ESD Caution ................................................................................ 10 Applications Information .............................................................. 27 Pin Configuration and Function Descriptions ........................... 11 Microprocessor Interfacing ....................................................... 27 Typical Performance Characteristics ........................................... 12 Grounding and Layout .............................................................. 28 Terminology .................................................................................... 14 Outline Dimensions ....................................................................... 29 Control Register .............................................................................. 15 Ordering Guide .......................................................................... 29 Sequencer Operation ................................................................. 16 Automotive Products ................................................................. 29 REVISION HISTORY 6/13Rev. B to Rev. C 2/09Rev. 0 to Rev. A Deleted Evaluating AD7904/AD7914/AD7924 Performance Updated Format .................................................................. Universal Section .............................................................................................. 29 Moved Figure 2 ..................................................................................9 Changes to Ordering Guide .......................................................... 29 Change to Table 5 ........................................................................... 10 Changes to Typical Performance Characteristics Section ........ 12 7/11Rev. A to Rev. B Moved Terminology Section ......................................................... 14 Changes to Features Section............................................................ 1 Updated Outline Dimensions ....................................................... 30 Changes to Signal to (Noise + Distortion) (SINAD) Parameter Changes to Ordering Guide .......................................................... 30 and Signal-to-Noise Ratio (SNR) Parameter in Table 1 .............. 3 11/02Revision 0: Initial Version Changes to Signal to (Noise + Distortion) (SINAD) Parameter and Signal-to-Noise Ratio (SNR) Parameter in Table 2 .............. 5 Changes to Signal to (Noise + Distortion) (SINAD) Parameter and Signal-to-Noise Ratio (SNR) Parameter in Table 3 .............. 7 Changes to Table 5 .......................................................................... 10 Changes to Ordering Guide .......................................................... 30 Added Automotive Products Section........................................... 30 Rev. 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