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AD7440 Datasheet

(AD7440 / AD7450A) Differential Input / 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23

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Data Sheet
Differential Input, 1 MSPS
10-Bit and 12-Bit ADCs in an 8-Lead SOT-23
AD7440/AD7450A
FEATURES
Fast throughput rate: 1 MSPS
Specified for VDD of 3 V and 5 V
Low power at max throughput rate
4 mW max at 1 MSPS with 3 V supplies
9.25 mW max at 1 MSPS with 5 V supplies
Fully differential analog input
Wide input bandwidth
70 dB SINAD at 100 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
SPI/QSPI™/MICROWIRE™/DSP compatible
Power-down mode: 1 μA max
8-lead SOT-23 and MSOP packages
APPLICATIONS
Transducer interface
Battery-powered systems
Data acquisition systems
Portable instrumentation
Motor control
GENERAL DESCRIPTION
The AD7440/AD7450A1 are 10-bit and 12-bit high speed, low
power, successive approximation (SAR) analog-to-digital
converters with a fully differential analog input. These parts
operate from a single 3 V or 5 V power supply and use
advanced design techniques to achieve very low power
dissipation at throughput rates up to 1 MSPS. The SAR
architecture of these parts ensures that there are no pipeline
delays.
The parts contain a low noise, wide bandwidth, differential
track-and-hold amplifier (T/H) that can handle input
frequencies up to 3.5 MHz. The reference voltage is applied
externally to the VREF pin and can be varied from 100 mV to
3.5 V depending on the power supply and what suits the
application. The value of the reference voltage determines the
common-mode voltage range of the part. With this truly
differential input structure and variable reference input, the
user can select a variety of input ranges and bias points.
The conversion process and data acquisition are controlled
using CS and the serial clock, allowing the device to interface
with microprocessors or DSPs. The input signals are sampled
1 Protected by U.S. Patent Number 6,681,332.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
VDD
VIN+
VIN–
VREF
12-BIT
T/H SUCCESSIVE
APPROXIMATION
ADC
AD7440/AD7450A CONTROL LOGIC
SCLK
SDATA
CS
GND
Figure 1.
on the falling edge of CS; the conversion is also initiated at this
point. The SAR architecture of these parts ensures that there are
no pipeline delays. The AD7440 and the AD7450A use advanced
design techniques to achieve very low power dissipation at high
throughput rates.
PRODUCT HIGHLIGHTS
1. Operation with either 3 V or 5 V power supplies.
2. High throughput with low power consumption.
With a 3 V supply, the AD7440/AD7450A offer 4 mW
max power consumption for 1 MSPS throughput.
3. Fully differential analog input.
4. Flexible power/serial clock speed management.
The conversion rate is determined by the serial clock,
allowing the power to be reduced as the conversion time
is reduced through the serial clock speed increase. These
parts also feature a shutdown mode to maximize power
efficiency at lower throughput rates.
5. Variable voltage reference input.
6. No pipeline delay.
7. Accurate control of the sampling instant via a CS input and
once-off conversion control.
8. ENOB > eight bits typically with 100 mV reference.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2003–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7440 Datasheet

(AD7440 / AD7450A) Differential Input / 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23

No Preview Available !

AD7440/AD7450A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
AD7440–Specifications.................................................................... 3
AD7450A–Specifications................................................................. 5
Timing Specifications....................................................................... 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configurations and Function Descriptions ........................... 9
Terminology .................................................................................... 10
AD7440/AD7450A–Typical Performance Characteristics ....... 12
Circuit Information ........................................................................ 15
Converter Operation.................................................................. 15
ADC Transfer Function............................................................. 15
REVISION HISTORY
7/15—Rev. C to Rev. D
Changed FSCLK to fSCLK.................................................... Throughout
Changes to Figure 34...................................................................... 18
Changes to Power vs. Throughput Rate Section ........................ 24
Deleted Microprocessor and DSP Interfacing Section,
AD7440/AD7450A to ADSP-21xx Section, Table 7, and Figure
45; Renumbered Sequentially ....................................................... 25
Deleted AD7440/AD7450A to TMS320C5x/C54x Section,
Figure 46, AD7440/AD7450A to DSP56xxx Section, and
Figure 47 .......................................................................................... 26
Updated Outline Dimensions ....................................................... 27
Changes to Ordering Guide .......................................................... 28
9/05—Rev. B to Rev. C
Changes to Ordering Guide .......................................................... 28
Data Sheet
Typical Connection Diagram ................................................... 16
Analog Input ............................................................................... 16
Driving Differential Inputs ....................................................... 18
Digital Inputs .............................................................................. 19
Reference ..................................................................................... 19
Single-Ended Operation............................................................ 20
Serial Interface ............................................................................ 21
Modes of Operation ....................................................................... 23
Normal Mode.............................................................................. 23
Power-Down Mode.................................................................... 23
Power-Up Time .......................................................................... 24
Power vs. Throughput Rate....................................................... 24
Grounding and Layout Hints.................................................... 25
Evaluating the AD7440/AD7450A Performance................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 27
2/04—Rev. A to Rev. B
Added Patent Note ............................................................................1
1/04—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to General Description .....................................................1
Changes to Table 1 Footnotes ..........................................................3
Changes to Table 2 Footnotes ..........................................................5
Changes to Table 3 Footnotes ..........................................................7
8/03—Revision 0: Initial Version
Rev. D | Page 2 of 27


Part Number AD7440
Description (AD7440 / AD7450A) Differential Input / 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23
Maker Analog Devices
Total Page 27 Pages
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