Datasheet AD8451 (Analog Devices) - 10

Data Sheet AD8451 TYPICAL PERFORMANCE CHARACTERISTICS
AVCC = +15 V, AVEE = −15 V, TA = 25°C, and RL = ∞, unless otherwise noted.
IA CHARACTERISTICS 30 20 25 E (V) 15 G A E (V) LT 20 G 10 A LT E VO D 15 5 E VO -MO D N 10 0 -MO N MMO O 5 –5 C MMO T O C PU 0 T –10 IN PU IN −5 –15 AVCC = +15V AVCC = +25V AVEE = –15V AVEE = −5V −10 –20 −10 −5
003
–20 –15 –10 –5 0 5 10 15 20 0 5 10 15 20 25 30
006
OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V)
12137- 12137- Figure 3. Input Common-Mode Voltage vs. Output Voltage Figure 6. Input Common-Mode Voltage vs. Output Voltage for AVCC = +25 V and AVEE = −5 V for AVCC = +15 V and AVEE = −15 V
15 15 AVCC = +15V AVEE = –15V 10 10 ) 5 5 mA) (mA ( T N NT E 0 0 CURR CURRE T U –5 UT P –5 IN INP –10 –10 AVCC = +25V AVEE = –5V –15 –15 –35 –30 –25 –20 –15 –10 –5 0 5 10 15 20 25 30 35 40 45
004
–45–40–35–30–25–20–15–10 –5 0 5 10 15 20 25 30 35 40 45
007
INPUT VOLTAGE (V)
12137-
INPUT VOLTAGE (V)
12137- Figure 4. Input Overvoltage Performance Figure 7. Input Overvoltage Performance for AVCC = +25 V and AVEE = −5 V for AVCC = +15 V and AVEE = −15 V
17.0 20 16.8 19 16.6 A) A) 18 n ( 16.4 n ( NT NT 16.2 AVCC = +15V 17 AVEE = –15V +IB 16.0 CURRE 16 CURRE AS AVCC = +25V –I 15.8 AS B BI AVEE = –5V 15 BI UT 15.6 UT INP 14 INP 15.4 13 15.2 15.0 12 –15 –10 –5 0 5 10 15 20 25
005
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
008
INPUT COMMON-MODE VOLTAGE (V)
12137-
TEMPERATURE (°C)
12137- Figure 5. Input Bias Current vs. Input Common-Mode Voltage Figure 8. Input Bias Current vs. Temperature Rev. 0 | Page 9 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS IA CHARACTERISTICS DA CHARACTERISTICS CC AND CV LOOP FILTER AMPLIFIERS, AND VSET BUFFER VINT BUFFER REFERENCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW INSTRUMENTATION AMPLIFIER (IA) Reversing Polarity When Charging and Discharging IA Offset Option Battery Reversal and Overvoltage Protection DIFFERENCE AMPLIFIER (DA) CC AND CV LOOP FILTER AMPLIFIERS Compensation VINT Buffer MODE PIN, CHARGE AND DISCHARGE CONTROL APPLICATIONS INFORMATION FUNCTIONAL DESCRIPTION POWER SUPPLY CONNECTIONS CURRENT SENSE IA CONNECTIONS Current Sensors Optional Low-Pass Filter VOLTAGE SENSE DA CONNECTIONS Reverse Battery Conditions BATTERY CURRENT AND VOLTAGE CONTROL INPUTS (ISET AND VSET) LOOP FILTER AMPLIFIERS CONNECTING TO A PWM CONTROLLER (VCTRL PIN) STEP-BY-STEP DESIGN EXAMPLE Step 1: Design the Switching Power Converter Step 2: Identify the Control Voltage Range of the ADP1972 Step 3: Determine the Control Voltage for the CV Loop Step 4: Determine the Control Voltage for the CC Loop and the Shunt Resistor Step 5: Choose the Control Voltage Sources Step 6: Select the Compensation Devices EVALUATION BOARD INTRODUCTION FEATURES AND TESTS EVALUATING THE AD8451 Test the Instrumentation Amplifier 20 mV Offset at IMEAS Output Test the Difference Amplifier 5 mV Offset at BVMEAS Output CC and CV Integrator Tests Loop Compensation SCHEMATIC AND ARTWORK OUTLINE DIMENSIONS ORDERING GUIDE