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AD7984 Datasheet

1.33 MSPS PulSAR 10.5 mW ADC

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Data Sheet
18-Bit, 1.33 MSPS PulSAR 10.5 mW
ADC in MSOP/LFCSP
AD7984
FEATURES
18-bit resolution with no missing codes
Throughput: 1.33 MSPS
Low power dissipation: 10.5 mW at 1.33 MSPS
INL: ±2.25 LSB maximum
Dynamic range: 99.7 dB typical
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.9 V to 5.0 V
Allows use of any input range
Easy to drive with the ADA4941
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Proprietary serial interface
SPI/QSPI/MICROWIRE™/DSP compatible
Ability to daisy-chain multiple ADCs and busy indicator
10-lead MSOP (MSOP-8 size) and 10-lead 3 mm × 3 mm
LFCSP, SOT-23 size
APPLICATIONS
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems
APPLICATION DIAGRAM
2.9V TO 5V 2.5V
±10V, ±5V, ..
ADA4941
REF VDD VIO
IN+ SDI
AD7984 SCK
IN–
GND
SDO
CNV
1.8V TO 5V
3- OR 4-WIRE
INTERFACE
(SPI, CS
DAISY CHAIN)
Figure 1.
GENERAL DESCRIPTION
The AD79841 is an 18-bit, successive approximation, analog-to-
digital converter (ADC) that operates from a single power
supply, VDD. It contains a low power, high speed, 18-bit
sampling ADC and a versatile serial interface port. On the CNV
rising edge, the AD7984 samples the voltage difference between
the IN+ and IN− pins. The voltages on these pins usually swing
in opposite phases between 0 V and VREF. The reference voltage,
REF, is applied externally and can be set independent of the
supply voltage, VDD.
The SPI-compatible serial interface also features the ability,
using the SDI input, to daisy-chain several ADCs on a single
3-wire bus and provides an optional busy indicator. It is compatible
with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
The AD7984 is available in a 10-lead MSOP or a 10-lead LFCSP
with operation specified from −40°C to +85°C.
1 Protected by U.S. Patent 6,703,961.
Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADC
Type
100 kSPS
250 kSPS
14-Bit
AD7940
AD79421
16-Bit
AD7680
AD76851
AD7683
AD76871
AD7684
AD7694
AD7988-1
18-Bit
AD7989-1
AD76911
1 Pin-for-pin compatible.
400 kSPS to 500 kSPS
AD79461
AD76861
AD76881
AD76931
AD7988-5
AD76901
AD7989-5
≥1000 kSPS
AD79801
AD79831
AD79821
AD79841
ADC Driver
ADA4941-x
ADA4841-x
ADA4941-x
ADA4841-x
Rev. B
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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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7984 Datasheet

1.33 MSPS PulSAR 10.5 mW ADC

No Preview Available !

AD7984
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Application Diagram........................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 11
Theory of Operation ...................................................................... 12
Circuit Information.................................................................... 12
Converter Operation.................................................................. 12
Typical Connection Diagram.................................................... 13
Analog Inputs.............................................................................. 14
REVISION HISTORY
7/14—Rev. A to Rev. B
Changed QFN (LFCSP) to LFCSP .............................. Throughout
Changes to Features Section and Table 1 ...................................... 1
Added Patent Note, Note 1.............................................................. 1
Changes to Power Supply Section ................................................ 15
Changes to Evaluating the AD7984 Performance Section........ 23
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
8/10—Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
11/07—Revision 0: Initial Version
Data Sheet
Driver Amplifier Choice ........................................................... 14
Single-to-Differential Driver .................................................... 15
Voltage Reference Input ............................................................ 15
Power Supply............................................................................... 15
Digital Interface .......................................................................... 16
CS Mode, 3-Wire Without Busy Indicator ............................. 17
CS Mode, 3-Wire with Busy Indicator .................................... 18
CS Mode, 4-Wire Without Busy Indicator ............................. 19
CS Mode, 4-Wire with Busy Indicator .................................... 20
Chain Mode Without Busy Indicator ...................................... 21
Chain Mode with Busy Indicator............................................. 22
Application Hints ........................................................................... 23
Layout .......................................................................................... 23
Evaluating the AD7984 Performance ...................................... 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
Rev. B | Page 2 of 24


Part Number AD7984
Description 1.33 MSPS PulSAR 10.5 mW ADC
Maker Analog Devices
Total Page 24 Pages
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