16-Channel, 1 MSPS, 12-Bit ADC with Sequencer Data Sheet AD7490 FEATURES FUNCTIONAL BLOCK DIAGRAM V DD Fast throughput rate: 1 MSPS Specified for V of 2.7 V to 5.25 V DD AD7490 REF IN Low power at maximum throughput rates 5.4 mW maximum at 870 kSPS with 3 V supplies 12-BIT SUCCESSIVE V 0 12.5 mW maximum at 1 MSPS with 5 V supplies IN T/H APPROXIMATION ADC 16 (single-ended) inputs with sequencer INPUT Wide input bandwidth: 69.5 dB SNR at 50 kHz input frequency MUX Flexible power/serial clock speed management No pipeline delays V 15 IN High speed serial interface, SPI/QSPI/MICROWIRE/ SCLK DSP compatible DOUT CONTROL SEQUENCER LOGIC DIN Full shutdown mode: 0.5 A maximum CS 28-lead TSSOP and 32-lead LFCSP packages V DRIVE AEC-Q100 qualified for automotive applications AGND APPLICATIONS Figure 1. Multichannel system monitoring Battery-powered equipment Power line monitoring Data acquisition, instrumentation, and process control frequency because this is also used as the master clock to GENERAL DESCRIPTION control the conversion. The AD7490 is a 12-bit high speed, low power, 16-channel, The AD7490 is available in a 32-lead LFCSP and a 28-lead successive approximation ADC. The part operates from a single TSSOP package. 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. The part contains a low noise, wide bandwidth PRODUCT HIGHLIGHTS track-and-hold amplifier that can handle input frequencies in 1. The AD7490 offers up to 1 MSPS throughput rates. At excess of 1 MHz. maximum throughput with 3 V supplies, the AD7490 The conversion process and data acquisition are controlled dissipates just 5.4 mW of power. using CS and the serial clock signal, allowing the device to 2. A sequence of channels can be selected, through which the easily interface with microprocessors or DSPs. The input signal AD7490 cycles and converts. is sampled on the falling edge of CS, and conversion is also 3. The AD7490 operates from a single 2.7 V to 5.25 V supply. initiated at this point. There are no pipeline delays associated The VDRIVE function allows the serial interface to connect with the part. directly to either 3 V or 5 V processor systems independent of V . DD The AD7490 uses advanced design techniques to achieve very 4. The conversion rate is determined by the serial clock, low power dissipation at high throughput rates. For maximum allowing the conversion time to be reduced through the throughput rates, the AD7490 consumes just 1.8 mA with 3 V serial clock speed increase. The part also features various supplies, and 2.5 mA with 5 V supplies. shutdown modes to maximize power efficiency at lower By setting the relevant bits in the control register, the analog throughput rates. Power consumption is 0.5 A, maximum, input range for the part can be selected to be a 0 V to REFIN when in full shutdown. input or a 0 V to 2 REFIN input, with either straight binary 5. The part features a standard successive approximation or twos complement output coding. The AD7490 features 16 CS ADC with accurate control of the sampling instant via a single-ended analog inputs with a channel sequencer to allow a input and once off conversion control. preprogrammed selection of channels to be converted sequen- tially. The conversion time is determined by the SCLK Rev. E 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 20022021 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 02691-001AD7490 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 16 Applications ....................................................................................... 1 Circuit Information .................................................................... 16 Functional Block Diagram .............................................................. 1 Converter Operation .................................................................. 16 General Description ......................................................................... 1 ADC Transfer Function ............................................................. 17 Product Highlights ........................................................................... 1 Typical Connection Diagram ................................................... 18 Revision History ............................................................................... 2 Modes of Operation ................................................................... 19 Specifications ..................................................................................... 3 Serial Interface ............................................................................ 22 Timing Specifications .................................................................. 5 Power vs. Throughput Rate ....................................................... 23 Absolute Maximum Ratings ............................................................ 6 Microprocessor Interfacing ....................................................... 24 Electrostatic Discharge (ESD) Ratings ...................................... 6 Applications Information .............................................................. 26 ESD Caution .................................................................................. 6 Grounding and Layout .............................................................. 26 Pin Configurations and Function Descriptions ........................... 7 PCB Design Guidelines for Chip Scale Package .................... 26 Typical Performance Characteristics ............................................. 8 Evaluating the AD7490 Performance ...................................... 26 Terminology .................................................................................... 10 Outline Dimensions ....................................................................... 27 Internal Register Structure ............................................................ 12 Ordering Guide .......................................................................... 28 Control Register .......................................................................... 12 Automotive Products ................................................................. 28 Shadow Register .......................................................................... 14 REVISION HISTORY 8/2021Rev. D to Rev. E 5/2008Rev. A to Rev. B Added CP-32-3 Package ..................................................... Universal Updated Format .................................................................. Universal Changes to Title and Features Section ................................................... 1 Changes to Table 1 ............................................................................. 3 Added Applications Section ..................................................................... 1 Changes to Figure 12 and Figure 13 ............................................ 14 Changes to Specification Section and Table 1 ...................................... 3 Changes to Figure 14...................................................................... 15 Changes to t , t , t , and t Parameters, Table 2 .................................... 5 Changes to Reference Section ....................................................... 19 3 7 8 10 Changes to Operating Temperature Ranges Parameter and ESD Updated Outline Dimensions ....................................................... 26 Parameter, Table 3 ...................................................................................... 6 Changes to Ordering Guide .......................................................... 27 Added Electrostatic Discharge (ESD) Section, ESD Ratings for AD7490 Section, Table 4, Table 5, and Table 6 Renumbered 10/2002Rev. 0 to Rev. A Sequentially ................................................................................................. 6 Addition to General Description..................................................... 1 Changes to Power vs. Throughput Rate Section ................................ 23 Changes to Timing Specification Notes ......................................... 4 Changed Application Hints Section to Applications Information Change to Absolute Maximum Ratings ......................................... 5 Section ........................................................................................................ 26 Addition to Ordering Guide ............................................................ 5 Updated Outline Dimensions ............................................................... 27 Changes to Typical Performance Characteristics .......................... 8 Changes to Ordering Guide ................................................................... 28 Added new Figure 9 .......................................................................... 8 Added Automotive Products Section .................................................. 28 Changes to Figure 12 and Figure 14 ............................................ 11 Changes to Figure 20...................................................................... 13 12/2012Rev. C to Rev. D Changes to Figure 20 to Figure 26 ............................................... 14 Changes to Figure 4 and Table 4 ............................................................. 7 Addition to Analog Input section ................................................ 14 Updated Outline Dimensions (Changed CP-32-2 to CP-32-7) ... 26 Change to Figure 29 caption ......................................................... 18 Changes to Ordering Guide .......................................................... 27 Change to Figure 30 to Figure 32 ................................................. 18 Added Application Hints section ................................................. 20 6/2009Rev. B to Rev. C Change to IDD Auto Standby Mode Parameter, Table 1 ............... 4 1/2002Revision 0: Initial Version Rev. E Page 2 of 28