DataSheet26.com

AD8451 PDF даташит

Спецификация AD8451 изготовлена ​​​​«Analog Devices» и имеет функцию, называемую «Precision Analog Front End and Controller».

Детали детали

Номер произв AD8451
Описание Precision Analog Front End and Controller
Производители Analog Devices
логотип Analog Devices логотип 

32 Pages
scroll

No Preview Available !

AD8451 Даташит, Описание, Даташиты
Data Sheet
Low Cost, Precision Analog Front End and
Controller for Battery Test/Formation Systems
AD8451
FEATURES
Integrated constant current and voltage modes with
automatic switchover
Charge and discharge modes
Precision voltage and current measurement
Integrated precision control feedback blocks
Precision interface to PWM or linear power converters
Fixed gain settings
Current sense gain: 26 V/V (typ)
Voltage sense gain: 0.8 V/V (typ)
Excellent ac and dc performance
Maximum offset voltage drift: 0.9 µV/°C
Maximum gain drift: 3 ppm/°C
Low current sense amplifier input voltage noise: 9 nV/√Hz typ
Current sense CMRR: 108 dB min
TTL compliant logic
APPLICATIONS
Battery cell formation and testing
Battery module testing
GENERAL DESCRIPTION
The AD8451 is a precision analog front end and controller for
testing and monitoring battery cells. A precision fixed gain
instrumentation amplifier (IA) measures the battery charge/
discharge current, and a fixed gain difference amplifier (DA)
measures the battery voltage (see Figure 1). Internal laser
trimmed resistor networks set the gains for the IA and the DA,
optimizing the performance of the AD8451 over the rated
temperature range. The IA gain is 26 V/V and the DA gain is
0.8 V/V.
Voltages at the ISET and VSET inputs set the desired constant
current (CC) and constant voltage (CV) values. CC to CV
switching is automatic and transparent to the system.
A TTL logic level input, MODE, selects the charge or discharge
mode (high for charge, and low for discharge). An analog output,
VCTRL, interfaces directly with the Analog Devices, Inc.,
ADP1972 pulse-width modulation (PWM) controller.
The AD8451 simplifies designs by providing excellent accuracy,
performance over temperature, flexibility with functionality,
and overall reliability in a space-saving package. The AD8451 is
available in an 80-lead, 14 mm × 14 mm × 1.40 mm LQFP and
is rated for an operating temperature of −40°C to +85°C.
ISVP
ISVN
MODE
BVP
BVN
FUNCTIONAL BLOCK DIAGRAM
ISREFH/
ISREFL ISMEA ISET IVE0/IVE1
VINT
MUX
26
CURRENT
SENSE IA
VOLTAGE
SENSE DA
0.8
CONSTANT
CURRENT LOOP
FILTER
(CHARGE/
DISCHARGE)
SWITCHING
CONSTANT
VOLTAGE LOOP
FILTER
AD8451
VCLP
×1 VCTRL
VCLN
VOLTAGE
REFERENCE
VREF
BVREFH/
BVREFL
BVMEA
VSET VVE0/
VVE1
Figure 1.
VVP0
VSETBF VINT
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
http://www.Datasheet4U.com









No Preview Available !

AD8451 Даташит, Описание, Даташиты
AD8451
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 9
IA Characteristics ......................................................................... 9
DA Characteristics ..................................................................... 11
CC and CV Loop Filter Amplifiers, and VSET Buffer .......... 13
VINT Buffer ................................................................................ 15
Reference Characteristics .......................................................... 16
Theory of Operation ...................................................................... 17
Overview...................................................................................... 17
Instrumentation Amplifier (IA) ............................................... 18
Difference Amplifier (DA) ........................................................ 19
CC and CV Loop Filter Amplifiers.......................................... 19
REVISION HISTORY
3/14—Revision 0: Initial Version
Data Sheet
MODE Pin, Charge and Discharge Control ........................... 21
Applications Information .............................................................. 22
Functional Description.............................................................. 22
Power Supply Connections ....................................................... 23
Current Sense IA Connections................................................. 23
Voltage Sense DA Connections ................................................ 23
Battery Current and Voltage Control Inputs (ISET and VSET)
....................................................................................................... 23
Loop Filter Amplifiers ............................................................... 24
Connecting to a PWM Controller (VCTRL Pin) ...................... 24
Step-by-Step Design Example................................................... 24
Evaluation Board ............................................................................ 26
Introduction................................................................................ 26
Features and Tests....................................................................... 26
Evaluating the AD8451.............................................................. 27
Schematic and Artwork............................................................. 28
Outline Dimensions ....................................................................... 32
Ordering Guide .......................................................................... 32
Rev. 0 | Page 2 of 32
http://www.Datasheet4U.com









No Preview Available !

AD8451 Даташит, Описание, Даташиты
Data Sheet
AD8451
SPECIFICATIONS
AVCC = +15 V, AVEE = −15 V; DVCC = +5 V; TA = 25°C, unless otherwise noted.
Table 1.
Parameter
CURRENT SENSE INSTRUMENTATION AMPLIFIER
Internal Fixed Gain
Gain Error
Gain Drift
Gain Nonlinearity
Offset Voltage (RTI)
Offset Voltage Drift
Input Bias Current
Temperature Coefficient
Input Offset Current
Temperature Coefficient
Input Common-Mode Voltage Range
Over Temperature
Overvoltage Input Range
Differential Input Impedance
Input Common-Mode Impedance
Output Voltage Swing
Over Temperature
Capacitive Load Drive
Short-Circuit Current
Reference Input Voltage Range
Reference Input Bias Current
Output Voltage Level Shift
Maximum
Scale Factor
Common-Mode Rejection Ratio (CMRR)
Temperature Coefficient
Power Supply Rejection Ratio (PSRR)
Voltage Noise
Voltage Noise, Peak to Peak
Current Noise
Current Noise, Peak to Peak
Small Signal −3 dB Bandwidth
Slew Rate
VOLTAGE SENSE DIFFERENCE AMPLIFER
Internal Fixed Gains
Gain Error
Gain Drift
Gain Nonlinearity
Offset Voltage (RTO)
Offset Voltage Drift
Differential Input Voltage Range
Input Common-Mode Voltage Range
Differential Input Impedance
Input Common-Mode Impedance
Output Voltage Swing
Over Temperature
Capacitive Load Drive
Short-Circuit Current
Test Conditions/Comments
VISMEA = ±10 V
TA = TMIN to TMAX
VISMEA = ±10 V, RL = 2 kΩ
ISREFH and ISREFL pins grounded
TA = TMIN to TMAX
TA = TMIN to TMAX
TA = TMIN to TMAX
VISVP − VISVN = 0 V
TA = TMIN to TMAX
TA = TMIN to TMAX
ISREFH and ISREFL pins tied together
VISVP = VISVN = 0 V
ISREFL pin grounded
ISREFH pin connected to VREF pin
VISMEA/VISREFH
ΔVCM = 20 V
TA = TMIN to TMAX
ΔVS = 20 V
f = 1 kHz
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 0.1 Hz to 10 Hz
ΔVISMEA = 10 V
VIN = ±10 V
TA = TMIN to TMAX
VBVMEA = ±10 V, RL = 2 kΩ
BVREFH and BVREFL pins grounded
TA = TMIN to TMAX
VBVN = 0 V, VBVREFL = 0 V
VBVMEA = 0 V
TA = TMIN to TMAX
Rev. 0 | Page 3 of 32
Min Typ Max Unit
26
−110
15
AVEE + 2.3
AVEE + 2.6
AVCC − 55
AVEE + 1.5
AVEE + 1.7
150
150
AVEE
40
5
±0.1
3
3
+110
0.9
30
150
2
10
AVCC − 2.4
AVCC − 2.6
AVEE + 55
AVCC − 1.2
AVCC − 1.4
1000
AVCC
V/V
%
ppm/°C
ppm
µV
µV/°C
nA
pA/°C
nA
pA/°C
V
V
V
GΩ
GΩ
V
V
pF
mA
V
µA
17 20 23 mV
6.8 8 9.2
mV/V
108 dB
0.01 µV/V/°C
108 122
dB
9 nV/√Hz
0.2 µV p-p
80 fA/√Hz
5 pA p-p
1.5 MHz
5 V/µs
0.8
−16
−27
AVEE + 1.5
AVEE + 1.7
200
90
30
±0.1
3
3
500
4
+16
+27
AVCC − 1.5
AVCC − 1.7
1000
V/V
%
ppm/°C
ppm
µV
µV/°C
V
V
kΩ
kΩ
V
V
pF
mA
http://www.Datasheet4U.com










Скачать PDF:

[ AD8451.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
AD845CBFET Op AmpAnalog Devices
Analog Devices
AD8450Precision Analog Front End and ControllerAnalog Devices
Analog Devices
AD8451Precision Analog Front End and ControllerAnalog Devices
Analog Devices

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск