AD7988-5 반도체 회로 부품 판매점
16-Bit Lower Power PulSAR ADCs
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 Analog Devices |
Data Sheet
16-Bit Lower Power
PulSAR ADCs in MSOP/LFCSP
AD7988-1/AD7988-5
FEATURES
Low power dissipation
AD7988-1
400 µW at 100 kSPS (VDD only)
700 µW at 100 kSPS (total)
AD7988-5
2 mW at 500 kSPS (VDD only)
3.5 mW at 500 kSPS (total)
16-bit resolution with no missing codes
Throughput: 100 kSPS/500 kSPS options
INL: ±0.6 LSB typical, ±1.25 LSB maximum
SINAD: 91.5 dB at 10 kHz
THD: −114 dB at 10 kHz
Pseudo differential analog input range
0 V to VREF with VREF from 2.5 V to 5.5 V
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Proprietary SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
serial interface
Daisy-chain multiple ADCs
10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP, same space
as SOT-23
Wide operating temperature range: −40°C to +125°C
APPLICATIONS
Battery-powered equipment
Low power data acquisition systems
Portable medical instruments
ATE equipment
Data acquisitions
Communications
GENERAL DESCRIPTION
The AD7988-1/AD7988-51 are 16-bit, successive approximation,
analog-to-digital converters (ADC) that operate from a single
power supply, VDD. The AD7988-1 offers a 100 kSPS throughput,
and the AD7988-5 offers a 500 kSPS throughput. They are low
power, 16-bit sampling ADCs with a versatile serial interface
port. On the CNV rising edge, they sample an analog input,
IN+, between 0 V to VREF with respect to a ground sense, IN−.
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 to
daisy-chain several ADCs on a single 3-wire bus using the SDI
input. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using
the separate supply, VIO.
The AD7988-1/AD7988-5 generics are housed in a 10-lead
MSOP or a 10-lead LFCSP with operation specified from −40°C
to +125°C.
Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADCs
Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS
181 AD7989-12 AD76912 AD76902
AD79822
AD7989-52
AD79842
161 AD7684
AD76872 AD76882
AD79152
AD76932
AD79162
163 AD7680
AD76852 AD76862
AD79802
AD7683
AD7694
AD7988-52
AD79832
AD7988-12
143 AD7940
AD79422 AD79462
1 True differential.
2 Pin-for-pin compatible.
3 Pseudo differential.
TYPICAL APPLICATION CIRCUIT
2.5V TO 5V 2.5V
0V TO VREF
REF VDD VIO
IN+ AD7988-1/ SDI
IN–
AD7988-5
SCK
SDO
GND
CNV
Figure 1.
1.8V TO 5.5V
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
1 Protected by U.S. Patent 6,703,961.
Rev. F
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Technical Support
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AD7988-1/AD7988-5
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Application Circuit ............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Terminology ...................................................................................... 9
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 14
Circuit Information.................................................................... 14
Converter Operation.................................................................. 14
Typical Connection Diagram.................................................... 15
REVISION HISTORY
4/16—Rev. E to Rev. F
Changed AD7988-x to AD7988-1/AD7988-5 ........... Throughout
Changes to Table 1............................................................................ 1
Changes to Table 2............................................................................ 3
Changes to Table 3............................................................................ 4
Changes to Table 4............................................................................ 5
Added Table 5: Renumbered Sequentially .................................... 6
Changes to Figure 29...................................................................... 14
Changes to Table 9.......................................................................... 16
Changes to Voltage Reference Input Section .............................. 17
Changes to Figure 35...................................................................... 18
Changes to Figure 37...................................................................... 20
Changes to Ordering Guide .......................................................... 23
8/14—Rev. D to Rev. E
Deleted QFN .................................................................. Throughout
Changed Typical Application Diagram Section to Typical
Application Circuit Section............................................................. 1
Changes to Features Section............................................................ 1
Added Patent Note, Note 1.............................................................. 1
Changes to Table 1............................................................................ 1
Changes to AC Accuracy Parameter, Table 2................................ 3
Changed nA to µA, Standby Current Parameter, Unit Column,
Table 3 ................................................................................................ 4
Changes to Table 8.......................................................................... 16
Changes to Power Supply Section ................................................ 17
Updated Outline Dimensions ....................................................... 22
Data Sheet
Analog Inputs.............................................................................. 16
Driver Amplifier Choice ........................................................... 16
Voltage Reference Input ............................................................ 17
Power Supply............................................................................... 17
Digital Interface .......................................................................... 17
CS Mode, 3-Wire........................................................................ 18
CS Mode 4-Wire......................................................................... 19
Chain Mode ................................................................................ 20
Applications Information .............................................................. 21
Interfacing to Blackfin® DSP ..................................................... 21
Layout .......................................................................................... 21
Evaluating the Performance of the AD7988-1/AD7988-5 ..... 21
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 23
8/13—Rev. C to Rev. D
Changes to Features Section ............................................................1
Changes to Table 3.............................................................................4
Updated Outline Dimensions....................................................... 22
Changes to Ordering Guide .......................................................... 23
8/12—Rev. B to Rev. C
Changes to Ordering Guide .......................................................... 23
5/12—Rev. A to Rev. B
Changes to Table 3.............................................................................4
Updated Outline Dimensions....................................................... 22
2/12—Rev. 0 to Rev. A
Added LFCSP Thermal Impedance Values....................................7
Updated Outline Dimensions....................................................... 23
Changes to Ordering Guide .......................................................... 23
2/12—Revision 0: Initial Version
Rev. F | Page 2 of 23
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관련 데이터시트
AD7988-1
16-Bit Lower Power PulSAR ADCs - Analog Devices
AD7988-5
16-Bit Lower Power PulSAR ADCs - Analog Devices