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Analog Devices Semiconductor Electronic Components Datasheet

AD7490 Datasheet

12-Bit ADC

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Data Sheet
16-Channel, 1 MSPS, 12-Bit ADC
with Sequencer in 28-Lead TSSOP
AD7490
FEATURES
Fast throughput rate: 1 MSPS
Specified for VDD of 2.7 V to 5.25 V
Low power at maximum throughput rates
5.4 mW maximum at 870 kSPS with 3 V supplies
12.5 mW maximum at 1 MSPS with 5 V supplies
16 (single-ended) inputs with sequencer
Wide input bandwidth
69.5 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
Full shutdown mode: 0.5 µA maximum
28-lead TSSOP and 32-lead LFCSP packages
GENERAL DESCRIPTION
The AD7490 is a 12-bit high speed, low power, 16-channel,
successive approximation ADC. The part operates from a single
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
track-and-hold amplifier that can handle input frequencies in
excess of 1 MHz.
The conversion process and data acquisition are controlled
using CS and the serial clock signal, allowing the device to
easily interface with microprocessors or DSPs. The input signal
is sampled on the falling edge of CS, and conversion is also
initiated at this point. There are no pipeline delays associated
with the part.
The AD7490 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. For maximum
throughput rates, the AD7490 consumes just 1.8 mA with 3 V
supplies, and 2.5 mA with 5 V supplies.
By setting the relevant bits in the control register, the analog
input range for the part can be selected to be a 0 V to REFIN
input or a 0 V to 2 × REFIN input, with either straight binary
or twos complement output coding. The AD7490 features 16
single-ended analog inputs with a channel sequencer to allow a
preprogrammed selection of channels to be converted sequen-
tially. The conversion time is determined by the SCLK
FUNCTIONAL BLOCK DIAGRAM
VDD
REFIN
AD7490
VIN0
T/H
INPUT
MUX
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
VIN15
SEQUENCER
CONTROL
LOGIC
AGND
Figure 1.
SCLK
DOUT
DIN
CS
VDRIVE
frequency because this is also used as the master clock to
control the conversion.
The AD7490 is available in a 32-lead LFCSP and a 28-lead
TSSOP package.
PRODUCT HIGHLIGHTS
1. The AD7490 offers up to 1 MSPS throughput rates. At
maximum throughput with 3 V supplies, the AD7490
dissipates just 5.4 mW of power.
2. A sequence of channels can be selected, through which the
AD7490 cycles and converts.
3. The AD7490 operates from a single 2.7 V to 5.25 V supply.
The VDRIVE function allows the serial interface to connect
directly to either 3 V or 5 V processor systems independent
of VDD.
4. The conversion rate is determined by the serial clock,
allowing the conversion time to be reduced through the
serial clock speed increase. The part also features various
shutdown modes to maximize power efficiency at lower
throughput rates. Power consumption is 0.5 µA, maximum,
when in full shutdown.
5. The part features a standard successive approximation
ADC with accurate control of the sampling instant via a CS
input and once off conversion control.
Rev. D
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
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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2002–2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7490 Datasheet

12-Bit ADC

No Preview Available !

AD7490* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
EVALUATION KITS
AD7490 Evaluation Board
DOCUMENTATION
Application Notes
AN-742: Frequency Domain Response of Switched-
Capacitor ADCs
AN-931: Understanding PulSAR ADC Support Circuitry
Data Sheet
AD7490-DSCC: Military Data Sheet
AD7490-EP: Enhanced Product Data Sheet
AD7490: 16-Channel, 1MSPS, 12-Bit ADC with Sequencer
in 28-Lead TSSOP Data Sheet
Technical Books
The Data Conversion Handbook, 2005
User Guides
UG-446: Evaluating the AD7490 Successive
Approximation ADC
SOFTWARE AND SYSTEMS REQUIREMENTS
AD7490 FMC-SDP Interposer & Evaluation Board / Xilinx
KC705 Reference Design
AD7490 Evaluation Software
BeMicro FPGA Project for AD7490 with Nios driver
REFERENCE MATERIALS
Product Selection Guide
SAR ADC & Driver Quick-Match Guide
Technical Articles
MS-1779: Nine Often Overlooked ADC Specifications
MS-2210: Designing Power Supplies for High Speed ADC
Tutorials
MT-001: Taking the Mystery out of the Infamous Formula,
"SNR=6.02N + 1.76dB", and Why You Should Care
MT-002: What the Nyquist Criterion Means to Your
Sampled Data System Design
MT-031: Grounding Data Converters and Solving the
Mystery of "AGND" and "DGND"
DESIGN RESOURCES
AD7490 Material Declaration
PCN-PDN Information
Quality And Reliability
Symbols and Footprints
DISCUSSIONS
View all AD7490 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not
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Part Number AD7490
Description 12-Bit ADC
Maker Analog Devices
Total Page 29 Pages
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