Data Sheet July 2007 FN6145.2 Dual Quad Micropower Single Supply
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ISL28278, ISL28478
Data Sheet July 2007 FN6145.2
Dual Quad Micropower Single Supply Rail-to-Rail Input Output (RRIO) Op-Amp
ISL28278 ISL28478 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 EL8178. 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. ISL28278 ISL28478 draw minimal supply current while meeting excellent DC-accuracy, AC-performance, noise output drive specifications. ISL28278 contains power down enable that reduces power supply current typically disabled state.
Features
power 120µA typical supply current (ISL28278) 225V 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 (ISL28278 only) Pb-free plus anneal available (RoHS compliant)
Applications
Battery- solar-powered systems 25mA current loops
Pinouts
ISL28278 QSOP) VIEW
OUT_A IN-_A IN+_A EN_A OUT_B IN-_B IN+_B EN_B
Handheld consumer products Medical devices Thermocouple amplifiers Photodiode pre-amps probe amplifiers
Ordering Information
PART NUMBER (Note) ISL28278FAZ* ISL28478FAZ* PART MARKING 28278FAZ 28478FAZ PACKAGE (Pb-Free) QSOP QSOP PKG. DWG. MDP0040 MDP0040
ISL28478 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
*"-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.
ISL28278, ISL28478
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) 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 CMIR CMRR PSRR AVOL
DESCRIPTION
Input Offset Voltage 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,
-225 -450
±0.20
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
ISL28278, channels enabled. ISL28478, channels enabled.
IS,OFF
Quiescent Supply Current, Disabled
channels disabled. ISL28278
FN6145.2 July 2007
ISL28278, ISL28478
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 ISL28278 ISL28278 ISL28278 VISL28278 (Note (Note UNIT
PARAMETER IOVSUPPLY VENH VENL IENH IENL
DESCRIPTION Short Circuit Sourcing Capability Short Circuit Sinking Capability Supply Operating Range High Level Level Input High Current Input Current
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, Power Supply Rejection Ratio, 100, 100k, 0.1Hz 10Hz 1kHz 1kHz 1VP-P,
V+,V- ±1.2V ±2.5V, VSOURCE 1VP-P, V+,V- ±1.2V ±2.5V VSOURCE 1VP-P,
0.04
µVP-P nV/Hz pA/Hz
TRANSIENT RESPONSE Slew Rate Enable Output Turn-on Delay Time, Vout Enable Output Turn-off Delay Time, Vout NOTE: Parts 100% tested +25°C. Over temperature limits established characterization production tested. VCM, ISL28278 VCM, ISL28278
±0.12 ±0.09 ±0.14 ±0.16 ±0.21
V/µs
FN6145.2 July 2007
ISL28278, ISL28478 Typical Performance Curves 2.5V, Open, unless otherwise specified.
GAIN (dB) VOUT 50mVP-P 100k FREQUENCY (Hz) V+,V-= ±2.5V V+,V-= ±2.5V V+,V-= ±1.2V GAIN (dB) V+,V-= ±1.2V 100k V+,V-= ±2.5V V+,V-= ±1.2V
V+,V-= ±1.0V
FREQUENCY (Hz)
100k
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
GAIN GAIN (dB) PHASE 100k FREQUENCY (Hz)
PHASE GAIN (dB) -120
PHASE
PHASE
GAIN
-100 -150
100k
FREQUENCY (Hz)
FIGURE AVOL FREQUENCY 100k LOAD
FIGURE AVOL FREQUENCY LOAD
PSRR (dB)
V+,V- ±2.5VDC
VSOURCE 1VP-P PSRR CMRR (dB)
-100
V+,V- ±2.5VDC VSOURCE 1VP-P
PSRR
-100
100k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE PSRR FREQUENCY
FIGURE CMRR FREQUENCY
FN6145.2 July 2007
ISL28278, ISL28478 Typical Performance Curves 2.5V, Open, unless otherwise specified.
VOLTAGE NOISE (nV/Hz) CURRENT NOISE (fA/Hz) FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE VOLTAGE NOISE FREQUENCY
FIGURE CURRENT NOISE FREQUENCY
2.56 VOLTAGE NOISE (0.5µV/DIV) VOLTS -0.5 -1.0 -1.5 -2.0 -2.5 2.42 TIME (1s/DIV) TIME (µs) 2.46 2.44 2.52 VOUT 2.50 2.48 5VDC VOUT 0.1VP-P 2.54
FIGURE 0.1Hz 10Hz INPUT VOLTAGE NOISE
FIGURE SMALL SIGNAL TRANSIENT RESPONSE
0.1V/DIV 5VDC VOUT 4VP-P VOUT 1V/DIV INPUT
200mVP-P
VOLTS
VOUT
10µs/DIV TIME (µs)
FIGURE LARGE SIGNAL TRANSIENT RESPONSE
FIGURE ISL28278 ENABLE OUTPUT DELAY TIME
FN6145.2 July 2007
ISL28278, ISL28478 Typical Performance Curves 2.5V, Open, unless otherwise specified.
1000 (µV) -200 -400 -600 -800 -1000 OPEN 100k, +1000 IBIAS (pA) -100 OPEN 100k, +1000
FIGURE INPUT OFFSET VOLTAGE COMMON MODE INPUT VOLTAGE
FIGURE INPUT BIAS CURRENT COMMON-MODE INPUT VOLTAGE
CURRENT (µA)
1000 CURRENT (µA) MEDIAN TEMPERATURE (°C) TEMPERATURE (°C) MEDIAN
FIGURE ISL28478 SUPPLY CURRENT TEMPERATURE, V+,V- ±2.5V,
FIGURE ISL28278 DISABLED SUPPLY CURRENT TEMPERATURE, V+,V- ±2.5V
1000 (µV) -100 -200 -300 -400 TEMPERATURE (°C)
(µV) MEDIAN -100 -200 -300 -400 TEMPERATURE (°C) MEDIAN 1000
FIGURE TEMPERATURE, V+,V- ±2.5V
FIGURE TEMPERATURE, V+,V- ±1.2V
FN6145.2 July 2007
ISL28278, ISL28478 Typical Performance Curves 2.5V, Open, unless otherwise specified.
1000 -500 -1000 -1500 MEDIAN -2000 -2500 -200 IBIAS+ (pA) IBIAS- (pA) -400 -600 -800 -1000 -1200 -1400 MEDIAN 1000
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE IBIAS+ TEMPERATURE, V+,V- ±2.5V
FIGURE IBIAS- TEMPERATURE, V+,V- ±2.5V
1000 -500 -1000 -1500 -2000 -2500
1000 -200
IBIAS+ (pA)
IBIAS- (pA)
-400 -600 -800 -1000
MEDIAN
MEDIAN
-1200
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE IBIAS+ TEMPERATURE, V+,V- ±1.2V
FIGURE IBIAS- TEMPERATURE, V+,V- ±1.2V
1000 -200 (pA) -400 -600 -800 -1000 -1200 -1400 MEDIAN AVOL (V/mV)
1000 TEMPERATURE (°C) MEDIAN
TEMPERATURE (°C)
FIGURE TEMPERATURE, V+,V- ±2.5V
FIGURE AVOL TEMPERATURE, V+,V- ±2.5V, 100k
FN6145.2 July 2007
ISL28278, ISL28478 Typical Performance Curves 2.5V, Open, unless otherwise specified.
1000 AVOL (V/mV) CMRR (dB) MEDIAN 1000
MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE AVOL TEMPERATURE, V+,V- ±2.5V,
FIGURE CMRR TEMPERATURE, +2.5V -2.5V V+,V- ±2.5V
1000 VOUT
4.91 1000 4.90 4.89 4.88 4.87 4.86 4.85 MEDIAN
PSRR (dB)
MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE PSRR TEMPERATURE, V+,V- ±1.2V ±2.5V
FIGURE VOUT HIGH TEMPERATURE, V+,V- ±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 TEMPERATURE (°C) MEDIAN
1000 MEDIAN TEMPERATURE (°C)
FIGURE VOUT HIGH TEMPERATURE, V+,V- ±2.5V, 100k
FIGURE VOUT TEMPERATURE, V+,V- ±2.5V,
FN6145.2 July 2007
ISL28278, ISL28478 Typical Performance Curves 2.5V, Open, unless otherwise specified.
OUTPUT SHORT CIRCUIT CURRENT (mA) VOUT (mV) MEDIAN 1000 MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE VOUT TEMPERATURE, V+,V- ±2.5V, 100k
FIGURE OUTPUT SHORT CIRCUIT CURRENT TEMPERATURE, -2.55V, V+,V- ±2.5V
OUTPUT SHORT CIRCUIT CURRENT (mA)
1000 SLEW RATE (V/µs) MEDIAN
0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.10 0.09 MEDIAN 1000
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE OUTPUT SHORT CIRCUIT CURRENT TEMPERATURE, +2.55V, V+,V- ±2.5V
FIGURE SLEW RATE TEMPERATURE, VOUT ±1.5V,
0.20 0.19 0.18 SLEW RATE (V/µs) 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.10 MEDIAN 1000
TEMPERATURE (°C)
FIGURE SLEW RATE TEMPERATURE, VOUT ±1.5V,
FN6145.2 July 2007
ISL28278, ISL28478 Descriptions
ISL28278 QSOP) ISL28478 QSOP) NAME OUT_A IN-_A IN+_A IN+_B IN-_B OUT_B OUT_C IN-_C IN+_C VIN+_D IN-_D OUT_D EN_A EN_B Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit EQUIVALENT CIRCUIT Circuit Circuit Circuit Circuit Circuit Circuit Circuit Amplifier output Amplifier inverting input Amplifier non-inverting input Positive power supply Amplifier non-inverting input Amplifier inverting input Amplifier output internal connection Amplifier output Amplifier inverting input Amplifier non-inverting input Negative power supply Amplifier non-inverting input Amplifier inverting input Amplifier output Amplifier enable internal pull-down; Logic selects disabled state; Logic selects enabled state. Amplifier enable with internal pull-down; Logic selects disabled state; Logic selects enabled state.
LOGIC VCIRCUIT CIRCUIT
CAPACITIVELY COUPLED CLAMP
DESCRIPTION
ININ+
VCIRCUIT
CIRCUIT
Applications Information
Introduction
ISL28278 ISL28478 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 (ISL28278) supply current. This combination power precision performance makes these devices suitable solar battery power applications.
undesired change magnitude polarity input offset current. ISL28278 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).
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
Input Protection
input terminals have internal protection diodes positive negative supply rails, limiting input voltage 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.
FN6145.2 July 2007
ISL28278, ISL28478
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. Both parts, with 100k load, will typically swing within positive supply rail within negative supply rail. form continuous loop around both inputs. further reduction leakage currents, components mounted board using Teflon standoff insulators.
HIGH IMPEDANCE INPUT
Enable/Disable Feature
ISL28278 offers pins (EN_A EN_B) which disable when pulled least 2.0V. disabled state (output high impedance state), part consumes typically 4µA. disabling part, multiple parts connected together MUX. outputs tied together parallel channel selected pins. 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.
FIGURE GUARD RING EXAMPLE UNITY GAIN AMPLIFIER
Example Application
Thermocouples most popular temperature-sensing device because their cost, interchangeability, ability measure wide range temperatures. ISL28X78 (Figure used convert differential thermocouple voltage into single-ended signal with gain. ISL28X78's rail-to-rail input characteristic allows thermocouple biased ground amplifier from single supply.
Using Only Channel
ISL28278 ISL28478 dual quad channel amps. application only requires channel when using ISL28278 less than channels when using ISL28478, user must configure unused channel(s) prevent them from oscillating. unused channel(s) will oscillate input output pins floating. This will result higher than expected supply currents possible noise injection into channel being used. proper prevent this oscillation short output negative input ground positive input shown Figure 36).
100k TYPE THERMOCOUPLE ISL28X78
410µV/°C
100k
FIGURE THERMOCOUPLE AMPLIFIER
ISL28278 ISL28478
Current Limiting
ISL28278 ISL28478 have internal currentlimiting circuitry. output shorted, possible exceed Absolute Maximum Rating output current power dissipation, potentially resulting destruction device.
FIGURE PREVENTING OSCILLATIONS UNUSED CHANNELS
Proper Layout Maximizes Performance
achieve maximum performance high input impedance offset voltage ISL28278 ISL28478, 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
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.
FN6145.2 July 2007
ISL28278, ISL28478
where: PDMAXTOTAL maximum power dissipation each amplifier package (PDMAX) PDMAX each amplifier calculated Equation
OUTMAX SMAX OUTMAX (EQ.
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
FN6145.2 July 2007
ISL28278, ISL28478 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
Intersil U.S. products manufactured, assembled tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications viewed www.intersil.com/design/quality
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.
information regarding Intersil Corporation products, www.intersil.com
FN6145.2 July 2007
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