Data Sheet June 2007 FN6339.1 Dual Quad Micropower Single Supply
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ISL28288, ISL28488
Data Sheet June 2007 FN6339.1
Dual Quad Micropower Single Supply Rail-to-Rail Input Output (RRIO) Op-Amp
ISL28288 ISL28488 dual quad channel micropower operational amplifiers optimized single supply operation over 2.4V range. They operated from lithium cell Ni-Cd batteries. equivalent performance single channel op-amp reference EL8188. These devices feature Input Range Enhancement Circuit (IREC) which enables them maintain CMRR performance input voltages above positive supply rail 100mV below negative supply. output operation rail rail. ISL28288 ISL28488 draw minimal supply current while meeting excellent DC-accuracy, AC-performance, noise output drive specifications. ISL28288 contains power down enable that reduces power supply current typically less than disabled state.
Features
power 120µA typical supply current 1.5mV offset voltage 30pA input bias current 300kHz typical gain-bandwidth product 105dB typical PSRR 100dB typical CMRR Single supply operation down 2.4V Input capable swinging above below V(ground sensing) Rail-to-rail input output (RRIO) Enable (ISL28288 only) Pb-free plus anneal available (RoHS compliant)
Applications
Battery- solar-powered systems 25mA current loops
Pinouts
ISL28288 MSOP) VIEW
IN+_A EN_A EN_B IN+_B IN-_A OUT_A OUT_B IN-_B
Handheld consumer products Medical devices Thermocouple amplifiers Photodiode pre-amps probe amplifiers
Ordering Information
PART NUMBER (Note) ISL28288FUZ PART MARKING 8288Z 8288Z 28488 28488 PACKAGE (Pb-Free) MSOP MSOP QSOP QSOP PKG. DWG. MDP0043 MDP0043 MDP0040 MDP0040
ISL28488 QSOP) VIEW
OUT_A IN-_A IN+_A IN+_B IN-_B OUT_B OUT_D IN-_D IN+_D IN+_C IN-_C OUT_C
ISL28288FUZ-T7 ISL28488FAZ ISL28488FAZ-T7
*"-T7" suffix tape reel. Please refer TB347 details reel specifications. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials 100% matte plate termination finish, which RoHS compliant compatible with both SnPb Pb-free soldering operations. Intersil Pb-free products classified Pb-free peak reflow temperatures that meet exceed Pb-free requirements IPC/JEDEC STD-020.
CAUTION: These devices sensitive electrostatic discharge; follow proper Handling Procedures. 1-888-INTERSIL 1-888-468-3774 Intersil (and design) registered trademark Intersil Americas Inc. Copyright Intersil Americas Inc. 2006, 2007. Rights Reserved other trademarks mentioned property their respective owners.
ISL28288, ISL28488
Absolute Maximum Ratings +25°C)
Supply Voltage 5.5V Supply Turn Voltage Slew Rate 1V/s Differential Input Current Differential Input Voltage 0.5V Input Voltage 0.5V 0.5V Tolerance Human Body Model .3kV Machine Model .300V
Thermal Information
Thermal Resistance (°C/W) MSOP Package QSOP Package Output Short-Circuit Duration .Indefinite Ambient Operating Temperature Range .-40°C +125°C Storage Temperature Range .-65°C +150°C Operating Junction Temperature +125°C Pb-free reflow profile .see link below
CAUTION: operate near maximum ratings listed extended periods time. Exposure such conditions adversely impact product reliability result failures covered warranty. IMPORTANT NOTE: parameters having Min/Max specifications guaranteed. Typical values information purposes only. Unless otherwise noted, tests specified temperature pulsed tests, therefore:
Operating Junction
Electrical Specifications
2.5V, Open, +25°C unless otherwise specified. Boldface limits apply over operating temperature range, -40°C +125°C. Temperature data established characterization CONDITIONS (Note (Note UNIT
PARAMETER SPECIFICATIONS -Time CMIR CMRR PSRR AVOL
DESCRIPTION
Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Voltage Temperature Input Offset Current -40°C +85°C Input Bias Current -40°C +85°C Common-Mode Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain Guaranteed CMRR 2.4V 0.5V 4.5V, 100k 0.5V 4.5V, ISL28288
-1.5
±0.05
µV/Mo µV/°C
4.990 4.97 4.800 4.750 4.996 4.880
V/mV V/mV
VOUT
Maximum Output Voltage Swing
Output low, 100k Output low, Output high, 100k Output high,
IS,ON
Quiescent Supply Current, Enabled
ISL28288, channels enabled. ISL28488, channels enabled.
FN6339.1 June 2007
ISL28288, ISL28488
Electrical Specifications
2.5V, Open, +25°C unless otherwise specified. Boldface limits apply over operating temperature range, -40°C +125°C. Temperature data established characterization (Continued) CONDITIONS channels disabled. V0.8 +0.1 (Note (Note UNIT
PARAMETER IS,OFF IOVSUPPLY VENH VENL IENH IENL
DESCRIPTION Quiescent Supply Current, Disabled (ISL28288) Short Circuit Sourcing Capability Short Circuit Sinking Capability Supply Operating Range High Level (ISL28288) Level (ISL28288) Input High Current (ISL28288) Input Current (ISL28288)
SPECIFICATIONS Gain Bandwidth Product Input Noise Voltage Peak-to-Peak Input Noise Voltage Density CMRR 60Hz PSRR+ 120Hz PSRR- 120Hz Input Noise Current Density Input Common Mode Rejection Ratio Power Supply Rejection Ratio (V+) Power Supply Rejection Ratio (V-) 100, 100k, 0.1Hz 10Hz 1kHz 1kHz 1VP-P, ±1.2V ±2.5V, VSOURCE 1VP-P, ±1.2V ±2.5V VSOURCE 1VP-P, µVP-P nV/Hz pA/Hz
TRANSIENT RESPONSE Slew Rate Enable Output Turn-on Delay Time, Vout, (ISL28288) Enable Output Turn-off Delay Time, Vout, (ISL28288) NOTE: Parts 100% tested +25°C. Over temperature limits established characterization production tested.
±0.12 ±0.09 ±0.14 ±0.16 ±0.21
V/µs
FN6339.1 June 2007
ISL28288, ISL28488 Typical Performance Curves 2.5V, Open
GAIN (dB) VOUT 50mVP-P 100k FREQUENCY (Hz) ±2.5V ±2.5V ±1.2V GAIN (dB) ±1.2V 100k ±2.5V ±1.2V
±1.0V
FREQUENCY (Hz)
100k
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
GAIN (dB) 100k FREQUENCY (Hz)
PHASE GAIN (dB) -120
PHASE
PHASE
GAIN
-100 -150
100k
FREQUENCY (Hz)
FIGURE AVOL FREQUENCY 100k LOAD
FIGURE AVOL FREQUENCY LOAD
5VDC VSOURCE 1VP-P PSRR -100 100k PSRR
CMRR (dB) -100 100k ±2.5VDC VSOURCE 1VP-P
PSRR (dB)
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE PSRR FREQUENCY
FIGURE CMRR FREQUENCY
FN6339.1 June 2007
ISL28288, ISL28488 Typical Performance Curves 2.5V, Open
10.00 CURRENT NOISE (pA/Hz) VOLTAGE NOISE (nV/Hz)
(Continued)
1.00
0.10
0.01 100k FREQUENCY (Hz)
100k FREQUENCY (Hz)
FIGURE CURRENT NOISE FREQUENCY
FIGURE VOLTAGE NOISE FREQUENCY
2.56 2.54 VOLTAGE NOISE (1µV/DIV) 2.52 VOUT VOLTS 2.50 2.48 2.46 5VDC VOUT 0.1VP-P TIME (1s/DIV)
5.4µVP-P
2.44 2.42
TIME (µs)
FIGURE 0.1Hz 10Hz INPUT VOLTAGE NOISE
FIGURE SMALL SIGNAL TRANSIENT RESPONSE
VOLTS 0.1V/DIV VOUT 5VDC VOUT 2VP-P VOUT 1V/DIV INPUT 200mVP-P
10µs/DIV
TIME (µs)
FIGURE LARGE SIGNAL TRANSIENT RESPONSE
FIGURE ENABLE OUTPUT DELAY TIME
FN6339.1 June 2007
ISL28288, ISL28488 Typical Performance Curves 2.5V, Open
1000 I-BIAS (pA) (µV) -200 -400 -600 -800 -1000 OPEN 100k, +1000 -100 OPEN 100k, +1000
(Continued)
FIGURE INPUT OFFSET VOLTAGE COMMON MODE INPUT VOLTAGE
FIGURE INPUT BIAS CURRENT COMMON-MODE INPUT VOLTAGE
CURRENT (µA) MEDIAN CURRENT (µA) 1000
TEMPERATURE (°C) MEDIAN
TEMPERATURE (°C)
FIGURE ISL28488 SUPPLY CURRENT TEMPERATURE ±2.5V ENABLED,
FIGURE ISL28288 SUPPLY CURRENT TEMPERATURE ±2.5V DISABLED,
1000
1000
(mV)
(mV)
-0.5 -1.5 -2.5 MEDIAN
-0.5 -1.5 -2.5 MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE TEMPERATURE, ±2.5V
FIGURE TEMPERATURE ±1.2V
FN6339.1 June 2007
ISL28288, ISL28488 Typical Performance Curves 2.5V, Open
1000 -500 IBIAS- (pA) -1000 -1500 MEDIAN -2000 -2500 -200 IBIAS+ (pA) -400 -600 -800 -1000 -1200 -1400 MEDIAN 1000
(Continued)
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE IBIAS+ TEMPERATURE ±2.5V
FIGURE IBIAS- TEMPERATURE ±2.5V
1000 -500 -1000 -1500 -2000 -2500
1000 -200 IBIAS- (pA) -400 -600 -800 -1000 -1200 MEDIAN
IBIAS+ (pA)
MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE IBIAS+ TEMPERATURE ±1.2V
FIGURE IBIAS- TEMPERATURE ±-1.2V
1000 -200 (pA) -400 -600 -800 -1000 -1200 -1400 MEDIAN AVOL (V/mV)
MEDIAN 1000
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE TEMPERATURE ±2.5V
FIGURE AVOL TEMPERATURE ±2.5V, RL=100k
FN6339.1 June 2007
ISL28288, ISL28488 Typical Performance Curves 2.5V, Open
1000 AVOL (V/mV) MEDIAN CMRR (dB)
(Continued)
1000
MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE AVOL TEMPERATURE, ±2.5V, RL=1k
FIGURE CMRR TEMPERATURE +2.5V -2.5V, ±2.5V
1000 VOUT
4.91 1000 4.90 4.89
PSRR (dB)
4.88 MEDIAN 4.87 4.86
MEDIAN
4.85 4.84
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE PSRR TEMPERATURE, ±1.2V ±2.75V
FIGURE VOUT HIGH TEMPERATURE, ±2.5V,
4.9984 4.9982 4.9980 4.9978 VOUT VOUT (mV) 4.9976 4.9974 4.9972 4.9970 4.9968 4.9966 4.9964 MEDIAN
1000 MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE VOUT HIGH TEMPERATURE, ±2.5V, 100k
FIGURE VOUT TEMPERATURE, ±2.5V,
FN6339.1 June 2007
ISL28288, ISL28488 Typical Performance Curves 2.5V, Open
+OUTPUT SHORT CIRCUIT CURRENT (mA) VOUT (mV) MEDIAN 1000
(Continued)
MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE VOUT TEMPERATURE, ±2.5V, 100k
FIGURE +OUTPUT SHORT CIRCUIT CURRENT TEMPERATURE +2.5V, ±2.5V
-OUTPUT SHORT CIRCUIT CURRENT (mA)
1000 MEDIAN
TEMPERATURE (°C)
FIGURE -OUTPUT SHORT CIRCUIT CURRENT TEMPERATURE -2.5V, ±2.5V
Descriptions
ISL28288 ISL28488 MSOP) QSOP) NAME IN+_A EN_A VEN_B IN+_B IN-_B OUT_B OUT_A IN-_A EQUIVALENT CIRCUIT Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Amplifier non-inverting input Amplifier enable internal pull-down; Logic selects disabled state; Logic selects enabled state. Negative power supply Amplifier enable with internal pull-down; Logic selects disabled state; Logic selects enabled state. Amplifier non-inverting input Amplifier inverting input Amplifier output Positive power supply Amplifier output Amplifier inverting input DESCRIPTION
FN6339.1 June 2007
ISL28288, ISL28488 Descriptions (Continued)
ISL28288 ISL28488 MSOP) QSOP)
INLOGIC VCIRCUIT CIRCUIT
NAME OUT_C IN-_C IN+_C IN+_D IN-_D OUT_D
EQUIVALENT CIRCUIT Circuit Circuit Circuit Circuit Circuit Circuit Amplifier output Amplifier inverting input Amplifier non-inverting input Amplifier non-inverting input Amplifier inverting input Amplifier output internal connection
DESCRIPTION
CAPACITIVELY COUPLED CLAMP
VCIRCUIT
CIRCUIT
Applications Information
Introduction
ISL28288 ISL28488 dual quad CMOS rail-to-rail input, output (RRIO) micropower operational amplifiers. These devices designed operate from single supply (2.4V 5.0V) dual supplies (±1.2V ±2.5V) while drawing only 120A supply current. This combination power precision performance makes these devices suitable solar battery power applications.
within diode beyond supply rails. There additional pair back-to-back diodes across input terminals. applications where input differential voltage expected exceed 0.5V, external series resistors must used ensure input currents never exceed 5mA.
Rail-to-Rail Output
pair complementary MOSFET devices used achieve rail-to-rail output swing. NMOS sinks current swing output negative direction. PMOS sources current swing output positive direction. ISL28288 with 100k load will swing within positive supply rail within negative supply rail.
Rail-to-Rail Input
Many rail-to-rail input stages differential input pairs, long-tail PFET) NFET). Severe penalties have paid this circuit topology. input signal moves from supply rail another, operational amplifier switches from input pair other causing drastic changes input offset voltage undesired change magnitude polarity input offset current. ISL28288 achieves input rail-to-rail without sacrificing important precision specifications degrading distortion performance. devices' input offset voltage exhibits smooth behavior throughout entire common-mode input range. input bias current versus common-mode voltage range gives undistorted behavior from typically 100mV below negative rail higher than rail (0.5V higher than when equals 5V).
Enable/Disable Feature
ISL28288 offers that disables device when pulled least 2.0V. disabled state (output high impedance state), part consumes typically 4µA. disabling part, multiple ISL28288 parts connected together MUX. this configuration, outputs tied together parallel channel selected pin. loading effects feedback resistors disabled amplifier must considered when multiple amplifier outputs connected together. also internal pull down. left open, will pull negative rail device will enabled default.
Using Only Channel
ISL28288 dual amp. application only requires channel, user must configure unused channel prevent from oscillating. unused channel will oscillate input output pins floating. This will result higher than expected supply currents possible
Input Protection
input terminals have internal protection diodes both positive negative supply rails, limiting input voltage
FN6339.1 June 2007
ISL28288, ISL28488
noise injection into channel being used. proper prevent this oscillation short output negative input ground positive input shown Figure 34).
ISL28288
100k TYPE THERMOCOUPLE ISL28X88
410µV/°C
FIGURE PREVENTING OSCILLATIONS UNUSED CHANNELS
100k
Proper Layout Maximizes Performance
achieve maximum performance high input impedance offset voltage ISL28288, care should taken circuit board layout. board surface must remain clean free moisture avoid leakage currents between adjacent traces. Surface coating circuit board will reduce surface moisture provide humidity barrier, reducing parasitic resistance board. When input leakage current concern, guard rings around amplifier inputs will further reduce leakage currents. Figure shows guard ring example unity gain amplifier that uses impedance amplifier output same voltage high impedance input eliminate surface leakage. guard ring does need specific width, should form continuous loop around both inputs. further reduction leakage currents, components mounted board using Teflon standoff insulators.
HIGH IMPEDANCE INPUT
FIGURE THERMOCOUPLE AMPLIFIER
Current Limiting
ISL28288 internal current-limiting circuitry. output shorted, possible exceed Absolute Maximum Rating output current power dissipation, potentially resulting destruction device.
Power Dissipation
possible exceed +150°C maximum junction temperatures under certain load power-supply conditions. therefore important calculate maximum junction temperature (TJMAX) applications determine power supply voltages, load conditions, package type need modified remain safe operating area. These parameters related Equation
JMAX MAXTOTAL (EQ.
where: PDMAXTOTAL maximum power dissipation each amplifier package (PDMAX) PDMAX each amplifier calculated Equation
OUTMAX SMAX OUTMAX
(EQ. FIGURE GUARD RING EXAMPLE UNITY GAIN AMPLIFIER
where: TMAX Maximum ambient temperature Thermal resistance package PDMAX Maximum power dissipation amplifier Supply voltage (Magnitude IMAX Maximum supply current amplifier VOUTMAX Maximum output voltage swing application Load resistance
Example Application
Thermocouples most popular temperature-sensing device because their cost, interchangeability, ability measure wide range temperatures. ISL28288 (Figure used convert differential thermocouple voltage into single-ended signal with gain. ISL28288's rail-to-rail input characteristic allows thermocouple biased ground amplifier from single supply.
FN6339.1 June 2007
ISL28288, ISL28488 Quarter Size Outline Plastic Packages Family (QSOP)
(N/2)+1
MDP0040
QUARTER SIZE OUTLINE PLASTIC PACKAGES FAMILY INCHES SYMBOL QSOP16 QSOP24 QSOP28 TOLERANCE NOTES
I.D. MARK
0.068 0.006 0.056 0.010 0.008 0.193 0.236 0.154 0.025 0.025 0.041
0.068 0.006 0.056 0.010 0.008 0.341 0.236 0.154 0.025 0.025 0.041
0.068 0.006 0.056 0.010 0.008 0.390 0.236 0.154 0.025 0.025 0.041
Max. ±0.002 ±0.004 ±0.002 ±0.001 ±0.004 ±0.008 ±0.004 Basic ±0.009 Basic Reference
Rev. 2/07
0.010
(N/2)
SEATING PLANE 0.004 0.007
DETAIL
NOTES: Plastic metal protrusions 0.006" maximum side included. Plastic interlead protrusions 0.010" maximum side included. Dimensions "E1" measured Datum Plane "H". Dimensioning tolerancing ASME Y14.5M-1994.
0.010 GAUGE PLANE 4°±4° DETAIL
FN6339.1 June 2007
ISL28288, ISL28488 Mini Package Family (MSOP)
0.25 (N/2)+1
MDP0043
MINI PACKAGE FAMILY MILLIMETERS SYMBOL MSOP8 1.10 0.10 0.86 0.33 0.18 3.00 4.90 3.00 0.65 0.55 0.95 MSOP10 1.10 0.10 0.86 0.23 0.18 3.00 4.90 3.00 0.50 0.55 0.95 TOLERANCE Max. ±0.05 ±0.09 +0.07/-0.08 ±0.05 ±0.10 ±0.15 ±0.10 Basic ±0.15 Basic Reference NOTES Rev. 2/07 NOTES: Plastic metal protrusions 0.15mm maximum side included.
I.D.
(N/2)
SEATING PLANE 0.10 LEADS
0.08
DETAIL
Plastic interlead protrusions 0.25mm maximum side included. Dimensions "E1" measured Datum Plane "H". Dimensioning tolerancing ASME Y14.5M-1994.
GAUGE PLANE DETAIL
0.25
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Intersil products sold description only. Intersil Corporation reserves right make changes circuit design, software and/or specifications time without notice. Accordingly, reader cautioned verify that data sheets current before placing orders. Information furnished Intersil believed accurate reliable. However, responsibility assumed Intersil subsidiaries use; infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Intersil subsidiaries.
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FN6339.1 June 2007
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