offset voltage: Single-supply operation: noise: nV/Hz Wide bandwidth:
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Precision CMOS Rail-to-Rail Input/Output Operational Amplifiers AD8616/AD8618
offset voltage: Single-supply operation: noise: nV/Hz Wide bandwidth: Slew rate: V/µs High output current: phase reversal input bias current: supply current: Unity gain stable
CONFIGURATIONS
04648-0-001
AD8616
VIEW (Not Scale)
Figure 8-Lead MSOP (RM-8)
04648-0-002
AD8616
VIEW (Not Scale)
APPLICATIONS
Barcode scanners Battery-powered instrumentation Multipole filters Sensors ASIC input output amplifier Audio Photodiode amplification
Figure 8-Lead SOIC (R-8)
AD8618
Figure 14-Lead TSSOP (RU-14)
AD8618
04648-0-049
Figure 14-Lead SOIC (R-14)
GENERAL DESCRIPTION
AD8616/AD8618 dual/quad, rail-to-rail, input output, single-supply amplifiers featuring very offset voltage, wide signal bandwidth, input voltage current noise. parts patented trimming technique that achieves superior precision without laser trimming. AD8616/AD8618 fully specified operate from single supplies. combination bandwidth, offset, noise, very input bias current make these amplifiers useful wide variety applications. Filters, integrators, photodiode amplifiers, high impedance sensors benefit from combination performance features. applications benefit from wide bandwidth distortion. AD8616/ AD8618 offer highest output drive capability
Rev.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. Specifications subject change without notice. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective owners.
DigiTrimfamily, which excellent audio line drivers other impedance applications. Applications parts include portable powered instrumentation, audio amplification portable devices, portable phone headsets, code scanners, multipole filters. ability swing rail rail both input output enables designers buffer CMOS ADCs, DACs, ASICs, other wide output swing devices single-supply systems. AD8616/AD8618 specified over extended industrial (-40°C +125°C) temperature range. AD8616 available 8-lead MSOP narrow SOIC surface mount packages; MSOP version available tape reel only. AD8618 available 14-lead SOIC 14-lead TSSOP packages.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 2004 Analog Devices, Inc. rights reserved.
04648-0-048
AD8616/AD8618 TABLE CONTENTS
Specifications. Absolute Maximum Ratings. Thermal Resistance Caution. Typical Performance Characteristics Applications. Input Overvoltage Protection Output Phase Reversal. Driving Capacitive Loads. Overload Recovery Time Conversion Noise Applications High Speed Photodiode Preamplifier. Active Filters Power Dissipation Power Calculations Varying Unknown Loads. Outline Dimensions Ordering Guide
REVISION HISTORY
4/04-Data Sheet Changed from Rev. Rev. Added AD8618.Universal Updated Outline Dimensions
1/04-Revision Initial Version
Rev. Page
AD8616/AD8618 SPECIFICATIONS
@VCM VS/2, 25°C, unless otherwise noted. Table
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions -40°C +125°C -40°C +125°C -40°C +85°C -40°C +125°C Input Offset Current -40°C +85°C -40°C +125°C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High CMRR CDIFF 1500 4.99 4.92 ±150 Unit µV/°C V/mV V/µs Degrees nV/Hz nV/Hz pA/Hz
Offset Voltage Drift Input Bias Current
VOS/T
Output Voltage
-40°C +125°C -40°C +125°C MHz, -40°C +125°C 0.01%
4.98 4.88
Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Channel Separation
IOUT ZOUT PSRR
<0.5 0.05 -115 -110
Rev. Page
AD8616/AD8618
@VCM 25°C, unless otherwise noted. Table
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions -40°C +125°C -40°C +125°C -40°C +85°C -40°C +125°C Input Offset Current -40°C +85°C -40°C +125°C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Channel Separation CMRR CDIFF IOUT ZOUT PSRR 2.68 Unit µV/°C V/mV V/µs Degrees nV/Hz nV/Hz pA/Hz
Offset Voltage Drift Input Bias Current
VOS/T
-40°C +125°C -40°C +125°C MHz, -40°C +125°C 0.01%
2.65
<0.3 0.05 -115 -110
Rev. Page
AD8616/AD8618 ABSOLUTE MAXIMUM RATINGS
Table AD8616/AD8618 Stress Ratings
Parameter Supply Voltage Input Voltage Differential Input Voltage Ouput Short-Circuit Duration Storage Temperature Operating Temperature Range Lead Temperature Range (Soldering sec) Junction Temperature Rating Indefinite -65°C +150°C -40°C +125°C 300°C 150°C
THERMAL RESISTANCE
specified worst-case conditions, i.e., specified device soldered circuit board surface-mount packages. Table
Package Type 8-Lead MSOP (RM) 8-Lead SOIC 14-Lead SOIC 14-Lead TSSOP (RU) Unit °C/W °C/W °C/W °C/W
Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
CAUTION
(electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although this product features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
Rev. Page
AD8616/AD8618 TYPICAL PERFORMANCE CHARACTERISTICS
2200 2000 1800 25°C
±2.5V
INPUT BIAS CURRENT (pA)
NUMBER AMPLIFIERS
1600 1400 1200 1000
-700 -500 -300 -100
04648-0-003
OFFSET VOLTAGE (µV)
TEMPERATURE (°C)
Figure Input Offset Voltage Distribution
Figure Input Bias Current Temperature
NUMBER AMPLIFIERS
1000
±2.5V -40°C +125°C
25°C
VOUT (mV)
04648-0-004
SOURCE
SINK
TCVOS (µV/°C)
0.01
LOAD CURRENT (mA)
Figure Offset Voltage Drift Distribution
Figure Output Voltage Supply Rail Load Current
25°C
10mA LOAD
OUTPUT VOLTAGE (mV)
INPUT OFFSET VOLTAGE (µV)
-100 -200 -300
-400
04648-0-005
LOAD
04648-0-008
-500 COMMON-MODE VOLTAGE
TEMPERATURE (°C)
Figure Input Offset Voltage Common-Mode Voltage (200 Units, Five Wafer Lots Including Process Skews)
Figure Output Voltage Swing Temperature
Rev. Page
04648-0-007
0.001
04648-0-006
AD8616/AD8618
GAIN (dB)
±2.5V 25°C
PHASE (Degrees)
±2.5V
CMRR (dB)
100M
100k
04648-0-009
100k FREQUENCY (Hz)
FREQUENCY (Hz)
Figure Open-Loop Gain Phase Frequency
Figure Common-Mode Rejection Ratio Frequency
5.0V 4.9V 25°C
±2.5V
OUTPUT SWING p-p)
PSRR (dB)
04648-0-010
100k FREQUENCY (Hz)
100k FREQUENCY (Hz)
Figure Closed-Loop Output Voltage Swing
Figure PSRR Frequency
±2.5V
25°C
SMALL SIGNAL OVERSHOOT
OUTPUT IMPEDANCE
04648-0-011
100k
100M
CAPACITANCE (pF)
1000
FREQUENCY (Hz)
Figure Output Impedance Frequency
Figure Small-Signal Overshoot Load Capacitance
Rev. Page
04648-0-014
04648-0-013
D8616-0-012
AD8616/AD8618
SUPPLY CURRENT AMPLIFIER (mA)
04648-0-015
2.7V
VOLTAGE NOISE DENSITY (nV/
6.70
FREQUENCY (kHz)
TEMPERATURE (°C)
Figure Supply Current Temperature
Figure Voltage Noise Density Frequency
2000
SUPPLY CURRENT AMPLIFIER (µA)
1800 1600 1400 1200 1000
04648-0-016
200pF
SUPPLY VOLTAGE
TIME (1µs/DIV)
Figure Supply Current Supply Voltage
Figure Small-Signal Transient Response
FREQUENCY (kHz) 8.72
VOLTAGE NOISE DENSITY (nV/
200pF
VOLTAGE (500mV/DIV)
04648-0-017
TIME (1µs/DIV)
Figure Voltage Noise Density Frequency
Figure Large-Signal Transient Response
Rev. Page
04648-0-020
04648-0-019
VOLTAGE (50mV/DIV)
04648-0-018
AD8616/AD8618
±2.5V 0.5V 22kHz 100k 0.01
1400 2.7V 25°C 2.7V
1200
NUMBER AMPLIFIERS
04648-0-021
1000
THD+N
0.001
FREQUENCY (Hz)
-700
-500
-300
-100
OFFSET VOLTAGE (µV)
Figure
Figure Input Offset Voltage Distribution
±2.5V
INPUT OFFSET VOLTAGE (µV)
2.7V 25°C
-100 -200 -300 -400
VOLTAGE (2V/DIV)
04648-0-022
TIME (200ns/DIV)
COMMON-MODE VOLTAGE
Figure Settling Time
Figure Input Offset Voltage Common-Mode Voltage (200 Units, Five Wafer Lots Including Process Skews)
2.7V
3.5V 25°C
INPUT OFFSET VOLTAGE (µV)
-100 -200 -300 -400
VOLTAGE (1µV/DIV)
04648-0-023
TIME (1s/DIV)
COMMON-MODE VOLTAGE
Figure Input Voltage Noise
Figure Input Offset Voltage Common-Mode Voltage (200 Units, Five Wafer Lots Including Process Skews)
Rev. Page
04648-0-026
-500
04648-0-025
-500
04648-0-024
0.0001
AD8616/AD8618
1000 2.7V 25°C VOUT (mV)
2.7V 2.6V 25°C
OUTPUT SWING p-p)
SOURCE
SINK
LOAD CURRENT (mA)
04648-0-027
0.01
100k FREQUENCY (Hz)
Figure Output Voltage Supply Rail Load Current
Figure Closed-Loop Output Voltage Swing Frequency
2.7V
±1.35V 25°C
SMALL SIGNAL OVERSHOOT
LOAD
OUTPUT VOLTAGE (mV)
LOAD
04648-0-028
CAPACITANCE (pF)
1000
TEMPERATURE (°C)
Figure Output Voltage Swing Temperature
Figure Small-Signal Overshoot Load Capacitance
VOLTAGE NOISE DENSITY (nV/
±1.35V 25°C
PHASE (Degrees)
FREQUENCY (kHz) 2.7V 7.47
GAIN (dB)
-100
-135 -180
04648-0-029
100k
FREQUENCY (Hz)
Figure Open-Loop Gain Phase Frequency
Figure Voltage Noise Density Frequency
Rev. Page
04648-0-032
-225 100M
04648-0-0331
04648-0-030
0.001
AD8616/AD8618
FREQUENCY (kHz)
04648-0-035
2.7V 5.91
VOLTAGE NOISE DENSITY (nV/
2.7V 200pF
04648-0-033
VOLTAGE (500mV/DIV)
TIME (1µs/DIV)
Figure Voltage Noise Density Frequency
Figure Large-Signal Transient Response
2.7V 200pF
VOLTAGE (50mV/DIV)
TIME (1µs/DIV)
Figure Small-Signal Transient Response
Rev. Page
04648-0-034
AD8616/AD8618 APPLICATIONS
INPUT OVERVOLTAGE PROTECTION
AD8616/AD8618 have internal protective circuitry that allows voltages exceeding supply applied input. recommended, however, apply voltages that exceed supplies more than either input amplifier. higher input voltage applied, series resistors should used limit current flowing into inputs. input current should limited extremely input bias current allows larger resistors, which allows user apply higher voltages inputs. these resistors adds thermal noise, which contributes overall output voltage noise amplifier. example, resistor less than nV/Hz thermal noise less than error voltage room temperature. AD8616/AD8618. simple technique compensation snubber, which consists simple network. With this circuit place, output swing maintained amplifier stable gains. Figure shows implementation snubber, which reduces overshoot more than eliminates ringing, which cause instability. Using snubber does recover loss bandwidth incurred from heavy capacitive load.
±2.5V 500pF
VOLTAGE (100mV/DIV)
OUTPUT PHASE REVERSAL
AD8616/AD8618 immune phase inversion, phenomenon that occurs when voltage applied input amplifier exceeds maximum input common mode. Phase reversal cause permanent damage amplifier lock-ups systems with feedback loops.
±2.5V
TIME (2µs/DIV)
Figure Driving Heavy Capacitive Loads without Compensation
VOLTAGE (2V/DIV)
500pF
04648-0-038
VOUT
500pF 200mV
Figure Snubber Network
TIME (2ms/DIV)
Figure Phase Reversal
DRIVING CAPACITIVE LOADS
Although AD8616/AD8618 capable driving capacitive loads without oscillating, large amount overshoot present when operating frequencies above kHz. This especially true when amplifier configured positive unity gain (worst case). When such large capacitive loads required, external compensation highly recommended. This reduces overshoot minimizes ringing, which turn improves frequency response
VOLTAGE (100mV/DIV)
±2.5V 500pF 500pF
04648-0-036
TIME (10µs/DIV)
Figure Driving Heavy Capacitive Loads Using Snubber Network
Rev. Page
04648-0-039
04648-0-037
AD8616/AD8618
OVERLOAD RECOVERY TIME
Overload recovery time time takes output amplifier come saturation recover linear region. Overload recovery particularly important applications where small signals must amplified presence large transients. Figure Figure show positive negative overload recovery times AD8616. both cases, time elapsed before AD8616 comes saturation less than addition, symmetry between positive negative recovery times allows excellent signal rectification without distortion output signal.
±2.5V 50mV
0.1µF 2.5V 10µF 0.1µF
SERIAL INTERFACE
SCLK LDAC*
REFF
REFS
AD8616
VOUT
AD5542
UNIPOLAR OUTPUT
DGND
AGND
Figure Buffering Output
NOISE APPLICATIONS
Although AD8618 typically less than nV/Hz voltage noise density kHz, possible reduce further. simple method connect amplifiers parallel, shown Figure total noise output divided square root number amplifiers. this case, total noise approximately nV/Hz room temperature. resistor limits current provides effective output resistance
04648-0-040
+2.5V
-50mV
TIME (1µs/DIV)
Figure Positive Overload Recovery
±2.5V 50mV
-2.5V
VOUT
04648-0-041
+50mV
04648-0-043
TIME (1µs/DIV)
Figure Negative Overload Recovery
CONVERSION
AD8616 used output high resolution DACs. Their offset voltage, fast slew rate, fast settling time make parts suitable buffer voltage output current output DACs. Figure shows example AD8616 output AD5542. AD8616's rail-to-rail output distortion help maintain accuracy needed data acquisition systems automated test equipment.
Figure Noise Reduction
Rev. Page
04648-0-042
AD8616/AD8618
HIGH SPEED PHOTODIODE PREAMPLIFIER
AD8616/AD8618 excellent choices I-to-V conversions. very input bias, current noise, high unity gain bandwidth parts make them suitable, especially high speed photodiode preamps. high speed photodiode applications, diode operated photoconductive mode (reverse biased). This lowers junction capacitance expense increase amount dark current that flows diode. total input capacitance, diode capacitance that amp. This creates feedback pole causes degradation phase margin, making unstable. therefore necessary capacitor feedback compensate this pole. maximum signal bandwidth, select
GAIN (dB)
100k
FREQUENCY (Hz)
Figure Second-Order Butterworth Low-Pass Filter Frequency Response
POWER DISSIPATION
where unity gain bandwidth amplifier.
+2.5V -VBIAS
04648-0-044
Although AD8616/AD8618 capable providing load currents usable output load current drive capability limited maximum power dissipation allowed device package used. application, absolute maximum junction temperature AD8616/AD8618 150°C; this should never exceeded because device could suffer premature failure. Accurately measuring power dissipation integrated circuit always straightforward exercise; Figure been provided design setting safe output current drive level selecting heat sink package options available AD8616.
-2.5V
Figure High Speed Photodiode Preamplifier
POWER DISSIPATION
ACTIVE FILTERS
input bias current high unity gain bandwidth AD8616 make excellent choice precision filter design. Figure shows implementation second-order low-pass filter. Butterworth response corner frequency phase shift 90°. frequency response shown Figure
SOIC
MSOP
TEMPERATURE (°C)
Figure Maximum Power Dissipation Ambient Temperature
1.1k 1.1k
04648-0-045
Figure Second-Order Low-Pass Filter
Rev. Page
04648-0-047
04648-0-046
AD8616/AD8618
These thermal resistance curves were determined using AD8616 thermal resistance data each package maximum junction temperature 150°C. following formula used calculate internal junction temperature AD8616/AD8618 application: PDISS where: junction temperature; PDISS power dissipation; package thermal resistance, junction-to-case; ambient temperature circuit. calculate power dissipated AD8616/AD8618, following equation: PDISS ILOAD VOUT) where: ILOAD output load current; supply voltage; VOUT output voltage. quantity within parentheses maximum voltage developed across either output transistor.
Calculating Power Measuring Ambient Case Temperature
Given equations calculating junction temperature: where: junction temperature; ambient temperature. junction-to-ambient thermal resistance. where case temperature given data sheet. equations solved (power): TC)/(JC Once power been determined, necessary back calculate junction temperature assure that been exceeded. temperature measurements should directly package spot board that near package touching Measuring package could difficult. very small bimetallic junction glued package could used; infrared sensing device could used spot size small enough.
POWER CALCULATIONS VARYING UNKNOWN LOADS
Often, calculating power dissipated integrated circuit determine device being operated safe range simple might seem. many cases, power cannot directly measured. This result irregular output waveforms varying loads; indirect methods measuring power required. There methods calculate power dissipated integrated circuit. first done measuring package temperature board temperature. other directly measure circuit's supply current.
Calculating Power Measuring Supply Current
Power calculated directly supply voltage current known. However, supply current have component with pulse into capacitive load. This could make current very difficult calculate. This overcome lifting supply inserting current meter into circuit. this work, user must sure that current being delivered supply being measured. This usually good method single-supply system; however, system uses dual supplies, both supplies need monitored.
Rev. Page
AD8616/AD8618 OUTLINE DIMENSIONS
3.00
8.75 (0.3445) 8.55 (0.3366)
3.00
4.90
4.00 (0.1575) 3.80 (0.1496)
6.20 (0.2441) 5.80 (0.2283)
0.65 1.10 0.80 0.60 0.40
0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10
1.27 (0.0500)
1.75 (0.0689) 1.35 (0.0531)
0.50 (0.0197) 0.25 (0.0098)
0.15 0.00 0.38 0.22 COPLANARITY 0.10
0.51 (0.0201) 0.31 (0.0122)
SEATING PLANE
0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
0.23 0.08 SEATING PLANE
COMPLIANT JEDEC STANDARDS MS-012AB CONTROLLING DIMENSIONS MILLIMETERS; INCH DIMENSIONS PARENTHESES) ROUNDED-OFF MILLIMETER EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN
COMPLIANT JEDEC STANDARDS MO-187AA
Figure 8-Lead Micro Small Outline Package [MSOP] (RM-8) Dimensions shown millimeters
Figure 14-Lead Standard Small Outline Package [SOIC] (R-14) Dimensions shown millimeters (inches)
5.00 (0.1968) 4.80 (0.1890)
5.10 5.00 4.90
4.00 (0.1574) 3.80 (0.1497)
6.20 (0.2440) 5.80 (0.2284)
4.50 4.40 4.30
6.40
1.27 (0.0500) 0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099)
1.05 1.00 0.80
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
0.65 1.20 0.15 0.05 0.30 0.19 0.20 0.09 0.75 0.60 0.45
COMPLIANT JEDEC STANDARDS MS-012AA CONTROLLING DIMENSIONS MILLIMETERS; INCH DIMENSIONS PARENTHESES) ROUNDED-OFF MILLIMETER EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN
SEATING COPLANARITY PLANE 0.10
COMPLIANT JEDEC STANDARDS MO-153AB-1
Figure 8-Lead Standard Small Outline Package [SOIC] (R-8) Dimensions shown millimeters (inches)
Figure 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown millimeters
ORDERING GUIDE
Model AD8616ARM-R2 AD8616ARM-REEL AD8616AR AD8616AR-REEL AD8616AR-REEL7 AD8618AR AD8618AR-REEL AD8618AR-REEL7 AD8618ARU AR8618ARU-REEL Temperature Range -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C Package Description 8-Lead MSOP 8-Lead MSOP 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 14-Lead SOIC 14-Lead SOIC 14-Lead SOIC 14-Lead TSSOP 14-Lead TSSOP Package Outline RM-8 RM-8 R-14 R-14 R-14 RU-14 RU-14 Branding Code
2004 Analog Devices, Inc. rights reserved. Trademarks registered trademarks property their respective owners. D04648-0-4/04(A)
Rev. Page
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