Data Sheet June 2006 FN6301.0 Dual Precision Micropower Single Su
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ISL28276
Data Sheet June 2006 FN6301.0
Dual Precision Micropower Single Supply Rail-to-Rail Input Output Precision Op-Amps
ISL28276 dual channel micropower precision operational amplifier optimized single supply operation operate down 2.4V. equivalent performance single channel op-amp reference EL8176. ISL28276 features Input Range Enhancement Circuit (IREC) which enables ISL28276 maintain CMRR performance input voltages greater than positive supply. input signal capable swinging 0.5V above 5.0V supply (0.25V 2.4V supply) within 10mV from ground. output operation rail rail. ISL28276 draws minimal supply current while meeting excellent DC-accuracy, AC-performance, noise output drive specifications. Offset current, voltage current noise, slew rate, gain-bandwidth product times better than other micropower op-amps with equivalent supply current ratings. ISL28276 operated from lithium cell Ni-Cd batteries. input range includes both positive negative rail.
Features
120µA supply current both channels 100µV offset voltage 500pA input bias current 400kHz gain-bandwidth product 115dB PSRR CMRR Single supply operation down 2.4V Input capable swinging above within 10mV Ground Rail-to-rail output Output sources 31mA load current Pb-free plus anneal available (RoHS compliant)
Applications
Battery- solar-powered systems 25mA current loops Handheld consumer products Medical devices Thermocouple amplifiers
Ordering Information
PART NUMBER ISL28276IAZ (See Note) PART MARKING 28276IAZ TAPE REEL PACKAGE PKG. DWG.
Photodiode pre-amps probe amplifiers
Pinouts
ISL28276 QSOP) VIEW
OUT_A IN-_A IN+_A EN_A OUT_B IN-_B IN+_B EN_B
QSOP MDP0040 (Pb-free) QSOP MDP0040 (Pb-free)
ISL28276IAZ-T7 28276IAZ (See Note)
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. Rights Reserved other trademarks mentioned property their respective owners.
ISL28276
Absolute Maximum Ratings 25°C)
Supply Voltage .5.5V, 1V/µs Differential Input Current Differential Input Voltage 0.5V Input Voltage 0.5V 0.5V tolerance, Human Body Model .3kV tolerance, Machine Model .300V 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
CAUTION: Stresses above those listed "Absolute Maximum Ratings" cause permanent damage device. This stress only rating operation device these other conditions above those indicated operational sections this specification implied. IMPORTANT NOTE: parameters having Min/Max specifications guaranteed. Typical values information purposes only. Unless otherwise noted, tests specified temperature pulsed tests, therefore:
Opreating Junction
Electrical Specifications
PARAMETER -Time
0.1V, 1.4V, 25°C unless otherwise specified. Boldface limits apply over operating temperature range, -40°C +125°C CONDITIONS -100 -150 0.25 -2.5 0.1Hz 10Hz 1kHz 1kHz Guaranteed CMRR test 2.4V 0.5V 4.5V, 100k 0.5V 4.5V, 4.990 4.97 4.800 4.750 0.13 0.10 0.10 0.09 4.996 4.880 0.17 0.13 0.20 0.25 0.17 0.19 UNIT µV/Mo µV/°C µVPP nV/Hz pA/Hz V/mV V/mV V/µs V/µs
DESCRIPTION Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Drift Temperature Input Offset Current Input Bias Current Input Noise Voltage Peak-to-Peak Input Noise Voltage Density
CMIR CMRR PSRR AVOL
Input Noise Current Density Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain
VOUT
Maximum Output Voltage Swing
Output low, 100k Output low, Output high, 100k Output high,
SRGBW
Positive Slew Rate Negative Slew Rate Gain Bandwidth Product
FN6301.0 June 2006
ISL28276
Electrical Specifications
PARAMETER IS,ON IS,OFF ISC+ ISCVS VINH VINL IENH IENL 0.1V, 1.4V, 25°C unless otherwise specified. Boldface limits apply over operating temperature range, -40°C +125°C (Continued) CONDITIONS channels enabled. channels disabled. -0.1 +0.1 UNIT
DESCRIPTION Supply Current, Enabled Supply Current, Disabled Short Circuit Sourcing Capability Short Circuit Sinking Capability Minimum Supply Voltage Enable High Level Enable Level Enable Input Current Enable Input Current
Typical Performance Curves
±1.25V GAIN (dB) 2.7pF OPEN ±2.5V ±1.0V GAIN (dB) 2.7pF 99.02 221k 2.23k ±1.25V ±1.0V ±2.5V
100k
FREQUENCY (Hz)
100k
FREQUENCY (Hz)
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE (µV) INPUT OFFSET VOLTAGE (µV) VDD/2 -100 -150 -200 OUTPUT VOLTAGE 2.5V
VOS,
-100 COMMON-MODE INPUT VOLTAGE
FIGURE INPUT OFFSET VOLTAGE OUTPUT VOLTAGE
FIGURE INPUT OFFSET VOLTAGE COMMON-MODE INPUT VOLTAGE
FN6301.0 June 2006
ISL28276 Typical Performance Curves
GAIN (dB) 100k FREQUENCY (Hz)
(Continued)
PHASE -120 GAIN (dB)
PHASE
PHASE
GAIN
-100 -150
100k
FREQUENCY (Hz)
FIGURE AVOL FREQUENCY 100k LOAD
FIGURE AVOL FREQUENCY LOAD
PSRR (dB) PSRR 5VDC VSOURCE 1Vp-p 100k 100k PSRR CMRR(dB)
5VDC VSOURCE 1Vp-p 100k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE PSRR FREQUENCY
FIGURE CMRR FREQUENCY
2.56 2.54 2.52 VOUT 2.50 2.48 2.46 2.44 2.42 5VDC VOUT 0.1Vp-p 500W VOUT 5VDC VOUT 0.1Vp-p
FIGURE SMALL SIGNAL TRANSIENT RESPONSE
FIGURE LARGE SIGNAL TRANSIENT RESPONSE
FN6301.0 June 2006
ISL28276 Typical Performance Curves
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
VOLTAGE NOISE (200nV/DIV)
VOLTS
100K
100K
Function Generator 33140A
VOUT
1µVP-P
TIME (1s/DIV)
TIME (mS)
FIGURE 0.1Hz 10Hz INPUT VOLTAGE NOISE
FIGURE INPUT VOLTAGE SWING ABOVE SUPPLY
INPUT BIAS, OFFSET CURRENTS (pA)
SUPPLY VOLTAGE
COMMON-MODE INPUT VOLTAGE
FIGURE INPUT BIAS OFFSET CURRENTS COMMON-MODE INPUT VOLTAGE
SUPPLY CURRENT (µA)
FIGURE SUPPLY CURRENT SUPPLY VOLTAGE
FN6301.0 June 2006
ISL28276 Typical Performance Curves
CURRENT (µA) CURRENT (µA)
(Continued)
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE SUPPLY CURRENT TEMPERATURE ±1.2V ENABLED.
FIGURE SUPPLY CURRENT TEMPERATURE ±2.5V ENABLED.
1200 1000 CURRENT (pA) CURRENT (pA)
1400 1200 1000 TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE BIAS(+) TEMPERATURE ±2.5V
FIGURE BIAS(+) TEMPERATURE ±1.2V
1400 1200 CURRENT (pA)
1700 1500 CURRENT (pA) 1300 1100
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE BIAS(-) TEMPERATURE ±2.5V
FIGURE BIAS(-) TEMPERATURE ±1.2V
FN6301.0 June 2006
ISL28276 Typical Performance Curves
(Continued)
1200 1000 CURRENT (pA) CURRENT (pA)
1300 1100
-100
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE INPUT OFFSET CURRENT TEMPERATURE ±2.5V
FIGURE INPUT OFFSET CURRENT TEMPERATURE ±1.2V
(µV) -100 -150
(µV) -100 -150
-200
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE INPUT OFFSET VOLTAGE TEMPERATURE ±2.5V
FIGURE INPUT OFFSET VOLTAGE TEMPERATURE ±1.2V
CMRR (dB) PSRR (dB)
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE CMRR TEMPERATURE +2.5V -2.5V
FIGURE PSRR TEMPERATURE ±1.2V ±2.5V
FN6301.0 June 2006
ISL28276 Typical Performance Curves
2.40 2.39 2.38 VOUT 2.37 2.36 2.35 2.34 VOUT
(Continued)
-2.32 -2.33 -2.34 -2.35 -2.36 -2.37 -2.38 -2.39
TEMPERATURE (°C)
-2.4
TEMPERATURE (°C)
FIGURE POSITIVE VOUT TEMPERATURE ±2.5V
FIGURE NEGATIVE VOUT TEMPERATURE ±2.5V
2.4992 2.499 2.4988 2.4986 VOUT 2.4984 2.4982 2.498 2.4978 2.4976 2.4974
-2.4956 -2.4958 -2.496 -2.4962 VOUT -2.4964 -2.4966 -2.4968 -2.497
-2.4972
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE POSITIVE VOUT TEMPERATURE 100k ±2.5V
(nA)
FIGURE NEGATIVE VOUT TEMPERATURE 100k ±2.5V
(µA)
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE (EN) TEMPERATURE ±2.5V
FIGURE (EN) TEMPERATURE ±2.5V
FN6301.0 June 2006
ISL28276 Typical Performance Curves
0.18 0.16 SLEW RATE (V/µs) SLEW RATE (V/µs) 0.15 0.14 0.13 0.12 0.11
(Continued)
0.16
0.14
0.12
0.08
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE SLEW RATE TEMPERATURE ±2.5V INPUT ±0.75V
FIGURE SLEW RATE TEMPERATURE ±2.5V INPUT ±0.75V
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD POWER DISSIPATION POWER DISSIPATION AMBIENT TEMPERATURE (°C) 893mW
JEDEC JESD51-3 EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 633mW
AMBIENT TEMPERATURE (°C)
FIGURE PACKAGE POWER DISSIPATION AMBIENT TEMPERATURE
FIGURE PACKAGE POWER DISSIPATION AMBIENT TEMPERATURE
FN6301.0 June 2006
ISL28276 Descriptions
ISL28276 QSOP) NAME OUT_A IN-_A IN+_A EN_A EN_B IN+_B IN-_B OUT_B Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit EQUIVALENT CIRCUIT internal connection internal connection Amplifier output Amplifier inverting input Amplifier non-inverting input Amplifier enable internal pull-down; Logic selects disabled state; Logic selects enabled state. Negative power supply internal connection internal connection internal connection 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 internal connection
LOGIC VCIRCUIT CIRCUIT VVCIRCUIT
DESCRIPTION
CAPACITIVELY COUPLED CLAMP
CIRCUIT
Applications Information
Introduction
ISL28276 enhanced rail-to-rail input micropower precision operational amplifiers with enable feature. part designed operate from single supply (2.4V 5.0V) dual supply (±1.2V ±2.5V). device capable swinging 0.5V above 5.0V supply (0.25V 2.4V supply) within 10mV from ground. ISL28276 maintains CMRR performance input voltages greater than positive supply. output operation swing within about supply rails with 100k load (reference Figures through 32).
amplifier. 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. ISL28276 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 10mV above negative rail higher than rail (0.5V higher than when equals 5v).
Rail-to-Rail Input
input common-mode voltage range ISL28276 goes from negative supply positive supply without introducing additional offset errors degrading performance associated with conventional rail-to-rail input operational
FN6301.0 June 2006
ISL28276
Input Protection
input terminals have internal protection diodes both positive negative supply rails, limiting input voltage within diode beyond supply rails. ISL28276 additional back-to-back diodes across input terminals. overdriving inputs necessary, external input current must never exceed 5mA. External series resistors used external protection limit excessive external voltage current from damaging inputs. currents, components mounted board using Teflon standoff insulators.
HIGH IMPEDANCE INPUT ISL28276
Input Bias Current Compensation
input bias currents ISL28276 decimated down typical 500pA while maintaining excellent bandwidth micro-power operational amplifier. Inside ISL28276 input bias canceling circuit. input stage transistors still biased with adequate current speed canceling circuit sinks most base current, leaving small fraction input bias current.
FIGURE GUARD RING EXAMPLE UNITY GAIN AMPLIFIER
Example Application
Thermocouples most popular temperature-sensing device because their cost, interchangeability, ability measure wide range temperatures. ISL28276 (Figure used convert differential thermocouple voltage into single-ended signal with gain. ISL28276's rail-to-rail input characteristic allows thermocouple biased ground converter from single supply.
100k TYPE THERMOCOUPLE ISL28276
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. ISL28276 with 100k load will swing within supply rails.
Enable/Disable Feature
ISL28276 offers that disables device when pulled least 2.2V. disabled state (output high impedance state), part consumes typically 4µA. disabling part, multiple ISL28276 parts connected together MUX. outputs tied together parallel channel selected pin. also internal pull down. left open, will pull negative rail device will enabled default.
410µV/°C
100k
FIGURE THERMOCOUPLE AMPLIFIER
Proper Layout Maximizes Performance
achieve maximum performance high input impedance offset voltage ISL28276, 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
FN6301.0 June 2006
ISL28276 Quarter Size Outline Plastic Packages Family (QSOP)
(N/2)+1
MDP0040
QUARTER SIZE OUTLINE PLASTIC PACKAGES FAMILY 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. 3/01
0.010
(N/2)
SEATING PLANE 0.004 0.007
NOTES:
DETAIL
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
FN6301.0 June 2006
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