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ISL28288
Data Sheet September 20, 2006 FN6339.0
Dual Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op-Amp
The ISL28288 is a dual channel micropower precision operational amplifier optimized for single supply operation at 5V and can operate down to 2.4V. For equivalent performance in a single channel op-amp reference EL8188. The ISL28288 features an Input Range Enhancement Circuit (IREC) which enables the ISL28288 to maintain CMRR performance for input voltages equal to the positive and negative supply rails. The input signal is capable of swinging 10% above the positive supply rail and to 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail to rail. The ISL28288 draws minimal supply current while meeting excellent DC-accuracy, AC-performance, noise and output drive specifications. The ISL28288 can be operated from one lithium cell or two Ni-Cd batteries. The input range includes both positive and negative rail.
Features
* Low power 120A typ supply current for both channels * 1.5mV max offset voltage * 30pA typ input bias current * 300kHz gain-bandwidth product * 100dB typ PSRR and CMRR * Single supply operation down to 2.4V * Input is capable of swinging above V+ and below V(ground sensing) * Rail-to-rail input and output (RRIO) * Pb-free plus anneal available (RoHS compliant)
Applications
* Battery- or solar-powered systems * 4mA to 25mA current loops * Handheld consumer products * Medical devices * Thermocouple amplifiers * Photodiode pre-amps
Ordering Information
PART PART NUMBER MARKING ISL28288FUZ (See Note) 28288Z TAPE & REEL 50/Tube PACKAGE PKG. DWG. #
* pH probe amplifiers
10 Ld MSOP MDP0043 (Pb-free)
Pinout
ISL28288 (10 LD MSOP) TOP VIEW
IN+_A 1 EN_A 2 V- 3 EN_B 4 IN+_B 5 + + 10 IN-_A 9 OUT_A 8 V+ 7 OUT_B 6 IN-_B
ISL28288FUZ-T7 28288Z (See Note)
7" 10 Ld MSOP MDP0043 (1500 pcs) (Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL28288
Absolute Maximum Ratings (TA = +25C)
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Supply Turn On Voltage Slew Rate . . . . . . . . . . . . . . . . . . . . . 1V/s Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . V- - 0.5V to V+ + 0.5V ESD tolerance, Human Body Model . . . . . . . . . . . . . . . . . . . . . .3kV ESD tolerance, Machine Model . . . . . . . . . . . . . . . . . . . . . . . . .300V Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite Ambient Operating Temperature Range . . . . . . . . .-40C to +125C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . +125C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Operating Junction
Electrical Specifications
V+ = 5V, V- = 0V, VCM = 2.5V, VO = 1.4V, TA = +25C unless otherwise specified. Boldface limits apply over the operating temperature range, -40C to +125C, temperature data guaranteed by characterization CONDITIONS MIN -1.5 -2 TYP
0.05
PARAMETER VOS V OS -----------------Time V OS --------------T IOS IB eN
DESCRIPTION Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Drift vs Temperature Input Offset Current
MAX 1.5 2
UNIT mV V/Mo V/C
1.2 2.2
5
-600 Input Bias Current -40C to +85C Input Noise Voltage Peak-to-Peak Input Noise Voltage Density iN CMIR CMRR PSRR AVOL Input Noise Current Density Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain f = 0.1Hz to 10Hz fO = 1kHz fO = 1kHz Guaranteed by CMRR test VCM = 0V to 5V V+ = 2.4V to 5V VO = 0.5V to 4.5V, RL = 100k VO = 0.5V to 4.5V, RL = 1k VOUT Maximum Output Voltage Swing Output low, RL = 100k Output low, RL = 1k Output high, RL = 100k Output high, RL = 1k SR GBW Slew Rate Gain Bandwidth Product 4.990 4.97 4.800 4.750 0.12 0.09 0 80 75 85 80 200 190 100 105 300 25 3 130 4.996 4.880
0.14
30 600 30 80
pA pA VPP nV/Hz pA/Hz
-30 -80
10
5.4 48 0.1 5
V dB dB V/mV V/mV
6 30 175 225
mV mV V V
0.16 0.21
V/s kHz
300
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FN6339.0 September 20, 2006
ISL28288
Electrical Specifications
V+ = 5V, V- = 0V, VCM = 2.5V, VO = 1.4V, TA = +25C unless otherwise specified. Boldface limits apply over the operating temperature range, -40C to +125C, temperature data guaranteed by characterization (Continued) CONDITIONS All channels enabled. All channels disabled. RL = 10 RL = 10 29 24 24 20 2.4 2 0.8 VEN = 5V VEN = 0V -0.1 0.8 0 1 1.5 +0.1 MIN TYP 120 4 31 26 MAX 156 175 7 9 UNIT A A mA mA V V V A A
PARAMETER IS,ON IS,OFF ISC+ ISCVS VINH VINL IENH IENL
DESCRIPTION Supply Current, Enabled Supply Current, Disabled Short Circuit Sourcing Capability Short Circuit Sinking Capability Minimum Supply Voltage Enable Pin High Level Enable Pin Low Level Enable Pin Input Current Enable Pin Input Current
Typical Performance Curves
+1 0 -1 -2 GAIN (dB) -3 -4 -5 Vout = 50mVp-p AV = 1 -6 C = 3pF L RF=0/RG = INF -7 8 1k 10k 100k FREQUENCY (Hz) 1M 5M VS = 2.5V RL = 10k VS = 2.5V RL = 1k VS = 1.2V RL = 1k GAIN (dB) VS = 1.2V RL = 10k 45 40 35 30 25 20 AV = 100 15 RL = 10k CL = 3pF 10 R = 100k F RG = 1k 5 0 100 1k VS = 2.5V VS = 1.2V
VS = 1.0V
10k FREQUENCY (Hz)
100k
1M
FIGURE 1. FREQUENCY RESPONSE vs SUPPLY VOLTAGE
FIGURE 2. FREQUENCY RESPONSE vs SUPPLY VOLTAGE
100 INPUT OFFSET VOLTAGE (V) VCM = VDD/2 INPUT OFFSET VOLTAGE (V) 80 60 40 20 0 -20 -40 -60 -80 -100 0 1 2 3 4 5 OUTPUT VOLTAGE (V) VDD = 2.5V VDD = 5V
0
-20
VOS, V
-40
-60
-80
-100 0 1 2 3 4 5 COMMON-MODE INPUT VOLTAGE (V)
FIGURE 3. INPUT OFFSET VOLTAGE vs OUTPUT VOLTAGE
FIGURE 4. INPUT OFFSET VOLTAGE vs COMMON-MODE INPUT VOLTAGE
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ISL28288 Typical Performance Curves
120 80 GAIN (dB) 40 0 -40 -80 1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
(Continued)
80 40 PHASE () GAIN (dB) 0 -40 -80 -120 10M 100 80 PHASE 60 40 0 20 0 -20 10 GAIN -50 -100 -150 1M 200 150 100 50 PHASE ()
100
1k
10k
100k
FREQUENCY (Hz)
FIGURE 5. AVOL vs FREQUENCY @ 100k LOAD
FIGURE 6. AVOL vs FREQUENCY @ 1k LOAD
10 0 TEMPERATURE (C) -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 10 100 1k 10k 100k 1M PSRR (dB) PSRR + PSRR VS = 5VDC VSOURCE = 1Vp-p RL = 10k AV = +1
10 0 -10 -20 CMRR (dB) -30 -40 -50 -60 -70 -80 -90 -100 10 100 1k 10k 100k 1M VS = 2.5VDC VSOURCE = 1Vp-p RL = 10k
TEMPERATURE (C)
FIGURE 7. PSRR vs FREQUENCY
FIGURE 8. CMRR vs FREQUENCY
2.56 VIN 2.54 2.52 VOUT VOLTS (V) VOLTS (V) 2.50 2.48 2.46 2.44 2.42 0 2 4 6 8 10 12 14 16 18 20 TIME (s) VS = 5VDC VOUT = 0.1Vp-p RL = 1k AV = +1
5.0 4.0 3.0 2.0 1.0 0 0 50 100 150 200 250 VIN VS = 5VDC VOUT = 2Vp-p RL = 1k AV = -2 VOUT
TIME (s)
FIGURE 9. SMALL SIGNAL TRANSIENT RESPONSE
FIGURE 10. LARGE SIGNAL TRANSIENT RESPONSE
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FN6339.0 September 20, 2006
ISL28288 Typical Performance Curves
10.00 CURRENT NOISE (pA/Hz) VOLTAGE NOISE (nV/Hz)
(Continued)
1k
1.00
100
0.10
10
0.01 1 10 100 1k 10k 100k FREQUENCY (Hz)
1 1 10 100 1k 10k 100k FREQUENCY (Hz)
FIGURE 11. CURRENT NOISE vs FREQUENCY
FIGURE 12. VOLTAGE NOISE vs FREQUENCY
6 5 VOLTAGE NOISE (1V/DIV) 4
100K
VS +
V+ = 5V VIN
VOLTS (V)
100K
3 2 1 0 0
Function Generator 33140A
DUT +
VS -
1K
VOUT
5.4VP-P
50
100 TIME (ms)
150
200
TIME (1s/DIV)
FIGURE 13. 0.1Hz TO 10Hz INPUT VOLTAGE NOISE
FIGURE 14. INPUT VOLTAGE SWING ABOVE THE V+ SUPPLY
155 135 115 95 75 0.1V/DIV 55 35 2 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V) 0 VOUT 1V/DIV EN Input AV = -1 VIN = 200mVp-p V+ = 5V V- = 0V
SUPPLY CURRENT (A)
0 10s/DIV
FIGURE 15. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 16. ENABLE TO OUTPUT DELAY TIME
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FN6339.0 September 20, 2006
ISL28288 Typical Performance Curves
160 n = 12 150 MAX CURRENT (uA) MEDIAN 130 120 110 MIN 100 90 -40 CURRENT (uA) 140 4.4 4.2 4 3.8 3.6 3.4 3.2 -20 0 20 40 60 80 100 120 -40 -20 0 TEMPERATURE (C) 20 40 60 80 TEMPERATURE (C) 100 120 MIN MEDIAN MAX 4.6
(Continued)
4.8 n = 12
FIGURE 17. SUPPLY CURRENT vs TEMPERATURE VS = 2.5V ENABLED, RL = INF
FIGURE 18. SUPPLY CURRENT vs TEMPERATURE VS = 2.5V DISABLED, RL = INF
100 0 n = 12 CURRENT (pA) -200 MAX -300 -400 -500 -600 -700 -40 MEDIAN CURRENT (pA) -100
50 0 -50 -100 -150 -200 -250 MIN -300 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 -350 -40 MEDIAN MIN MAX n = 12
-20
0
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 19. I BIAS(+) vs TEMPERATURE VS = 2.5V
FIGURE 20. I BIAS(-) vs TEMPERATURE VS = 2.5V
50 0 CURRENT (pA) -50 -100 -150 -200 -250 -300 -350 -40 n = 12 MEDIAN MIN Min MAX
450.05 400.05 350.05 AVOL(V/mV) 300.05 250.05 200.05 150.05 100.05 50.05 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 0.05 -40
n = 12
MAX
MEDIAN
MIN
-20
0
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 21. INPUT OFFSET CURRENT vs TEMPERATURE VS = 2.5V
FIGURE 22. AVOL vs TEMPERATURE RL =100k, VO @ +2V/-2V @ VS 2.5V
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FN6339.0 September 20, 2006
ISL28288 Typical Performance Curves
800 600 400 VOLTAGE (V) 200 0 -200 MEDIAN -400 -600 -800 -1000 -40 MIN VOLTAGE (V) n = 12 MAX
(Continued)
800 600 400 200 0 -200 -400 -600 -800 -1000 MIN MEDIAN n = 12
MAX
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 23. INPUT OFFSET VOLTAGE vs TEMPERATURE VS = 2.5V
FIGURE 24. INPUT OFFSET VOLTAGE vs TEMPERATURE VS = 1.2V
140 n = 12 130 PSRR (dB) 120 110 100 MEDIAN 90 80 -40 MIN MAX
140 n = 12 130 120 110 MEDIAN 100 90 80 -40 MIN
CMRR (dB)
MAX
-20
0
20 40 60 80 TEMPERATURE (C)
100
120
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
FIGURE 25. CMRR vs TEMPERATURE, FREQ = 0Hz, VCM = +2.5V TO -2.5V
FIGURE 26. PSRR vs TEMPERATURE, FREQ = 0Hz, VS = 1.2V TO 2.5V
4.895 4.89 4.885 4.88 4.87 4.875
180 n = 12 n = 12 170
MAX
VOUT (mV)
160 MAX 150 140 130 MIN 120 110 100 MEDIAN
VOUT (V)
4.865 MEDIAN 4.86 4.855 4.85 4.845 4.84 -40 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 MIN
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
FIGURE 27. POSITIVE VOUT vs TEMPERATURE RL = 1k, VS = 2.5V
FIGURE 28. NEGATIVE VOUT vs TEMPERATURE RL = 1k, VS = 2.5V
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FN6339.0 September 20, 2006
ISL28288 Typical Performance Curves
4.9984 4.9982 4.998 4.9978 VOUT (V) 4.9976 4.9974 4.9972 4.997 4.9968 4.9966 4.9964 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 120 MEDIAN MIN VOUT (mV) n = 12 4.2 MAX 4.1 4 3.9 3.8 3.7 3.6 3.5 3.4 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 120 MIN MEDIAN MAX
(Continued)
4.3 n = 12
FIGURE 29. POSITIVE VOUT vs TEMPERATURE RL = 100k, VS = 2.5V
FIGURE 30. NEGATIVE VOUT vs TEMPERATURE RL = 100k, VS = 2.5V
14.5 14 MAX CURRENT (nA)
0.9 n = 12 0.85 CURRENT (A) 0.8 0.75 0.7 0.65 0.6 0.55 -40
n = 12
MAX
13.5 13 12.5 12 11.5 11 -40 MEDIAN MIN
MEDIAN MIN
-20
0
20 40 60 80 TEMPERATURE (C)
100
120
-20
0
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 31. IIL (EN) vs TEMPERATURE VS = 2.5V
FIGURE 32. IIH (EN) vs TEMPERATURE VS = 2.5V
0.2 0.19 SLEW RATE (V/s) 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 -40 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 MIN MEDIAN MAX n = 12 SLEW RATE (V/s))
0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 -40 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 MIN MEDIAN MAX n = 12
FIGURE 33. +SLEW RATE vs TEMPERATURE VS = 2.5V, INPUT = 0.75V AV = 2
FIGURE 34. -SLEW RATE vs TEMPERATURE VS = 2.5V, INPUT = 0.75V AV = 2
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FN6339.0 September 20, 2006
ISL28288 Typical Performance Curves
1.4 POWER DISSIPATION (W) POWER DISSIPATION (W) 1.2 1 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (C) 893mW
QS OP JA 16 =1 12 C /W
(Continued)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.2 1 0.8 633mW 0.6
J QS O
A =1
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
P1
0.4 0.2 0 0 25
58
6
C
/W
50
75 85 100
125
150
AMBIENT TEMPERATURE (C)
FIGURE 35. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
FIGURE 36. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Pin Descriptions
ISL28288 (10 LD MSOP) 1 2 3 4 5 6 7 8 9 10 PIN NAME IN+_A EN_A VEN_B IN+_B IN-_B OUT_B V+ OUT_A IN-_A EQUIVALENT CIRCUIT Circuit 1 Circuit 2 Circuit 4 Circuit 2 Circuit 1 Circuit 1 Circuit 3 Circuit 4 Circuit 3 Circuit 1 Amplifier A non-inverting input Amplifier A enable pin internal pull-down; Logic "1" selects the disabled state; Logic "0" selects the enabled state. Negative power supply Amplifier B enable pin with internal pull-down; Logic "1" selects the disabled state; Logic "0" selects the enabled state. Amplifier B non-inverting input Amplifier B inverting input Amplifier B output Positive power supply Amplifier A output Amplifier A inverting input
V+ V+ LOGIC PIN VCIRCUIT 2 CIRCUIT 3 OUT VVCIRCUIT 4
DESCRIPTION
V+ IN-
V+
CAPACITIVELY COUPLED ESD CLAMP
IN+ V-
CIRCUIT 1
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FN6339.0 September 20, 2006
ISL28288 Applications Information
Introduction
The ISL28288 is a dual CMOS rail-to-rail input, output (RRIO) micropower precision operational amplifier with an enable feature. The part is designed to operate from single supply (2.4V to 5.0V) or dual supply (1.2V to 2.5V) while drawing only 120A of supply current. The device has an input common mode range that extends 10% above the positive rail and up to 100mV below the negative supply rail. The output operation can swing within about 4mV of the supply rails with a 100k load (reference Figures 27 through 30). This combination of low power and precision performance makes this device suitable for solar and battery power applications.
Enable/Disable Feature
The ISL28288 offers an EN pin that disables the device when pulled up to at least 2.0V. In the disabled state (output in a high impedance state), the part consumes typically 4A. By disabling the part, multiple ISL28288 parts can be connected together as a MUX. In this configuration, the outputs are tied together in parallel and a channel can be selected by the EN pin. The EN pin also has an internal pull down. If left open, the EN pin will pull to the negative rail and the device will be enabled by default. The loading effects of the feedback resistors of the disabled amplifier must be considered when multiple amplifier outputs are connected together.
Using Only One Channel
The ISL28288 is a dual opamp. If the application only requires one channel, the user must configure the unused channel to prevent it from oscillating. The unused channel will oscillate if the input and output pins are floating. This will result in higher than expected supply currents and possible noise injection into the channel being used. The proper way to prevent this oscillation is to short the output to the negative input and ground the positive input (as shown in Figure 37).
ISL28288 +
Rail-to-Rail Input
The input common-mode voltage range of the ISL28288 goes from negative supply to 10% greater than the positive supply without introducing additional offset errors or degrading performance associated with a conventional railto-rail input operational amplifier. Many rail-to-rail input stages use two differential input pairs, a long-tail PNP (or PFET) and an NPN (or NFET). Severe penalties have to be paid for this circuit topology. As the input signal moves from one supply rail to another, the operational amplifier switches from one input pair to the other causing drastic changes in input offset voltage and an undesired change in magnitude and polarity of input offset current. The ISL28288 achieves input rail-to-rail without sacrificing important precision specifications and degrading distortion performance. The devices' input offset voltage exhibits a smooth behavior throughout the entire common-mode input range. The input bias current versus the common-mode voltage range gives us an undistorted behavior from typically 100mV below the negative rail and 10% higher than the V+ rail (0.5V higher than V+ when V+ equals 5V).
FIGURE 37. PREVENTING OSCILLATIONS IN UNUSED CHANNELS
Proper Layout Maximizes Performance
To achieve the maximum performance of the high input impedance and low offset voltage of the ISL28288, care should be taken in the circuit board layout. The PC board surface must remain clean and free of moisture to avoid leakage currents between adjacent traces. Surface coating of the circuit board will reduce surface moisture and provide a humidity barrier, reducing parasitic resistance on the board. When input leakage current is a concern, the use of guard rings around the amplifier inputs will further reduce leakage currents. Figure 38 shows a guard ring example for a unity gain amplifier that uses the low impedance amplifier output at the same voltage as the high impedance input to eliminate surface leakage. The guard ring does not need to be a specific width, but it should form a continuous loop around both inputs. For further reduction of leakage
Input Protection
All input terminals have internal ESD protection diodes to both positive and negative supply rails, limiting the input voltage to within one diode beyond the supply rails. The ISL28288 has additional back-to-back diodes across the input terminals. For applications where the input differential voltage is expected to exceed 0.5V, external series resistors must be used to ensure the input currents never exceed 5mA.
Rail-to-Rail Output
A pair of complementary MOSFET devices are used to achieve the rail-to-rail output swing. The NMOS sinks current to swing the output in the negative direction. The PMOS sources current to swing the output in the positive direction. The ISL28288 with a 100k load will swing to within 4mV of the positive supply rail and within 3mV of the negative supply rail.
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FN6339.0 September 20, 2006
ISL28288
currents, components can be mounted to the PC board using Teflon standoff insulators.
HIGH IMPEDANCE INPUT IN V+ 1/2 ISL28288
Current Limiting
The ISL28288 has no internal current-limiting circuitry. If the output is shorted, it is possible to exceed the Absolute Maximum Rating for output current or power dissipation, potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +150C maximum junction temperatures under certain load and power-supply conditions. It is therefore important to calculate the maximum junction temperature (TJMAX) for all applications to determine if power supply voltages, load conditions, or package type need to be modified to remain in the safe operating area. These parameters are related as follows:
T JMAX = T MAX + ( JA xPD MAXTOTAL ) (EQ. 1)
FIGURE 38. GUARD RING EXAMPLE FOR UNITY GAIN AMPLIFIER
Example Application
Thermocouples are the most popular temperature-sensing device because of their low cost, interchangeability, and ability to measure a wide range of temperatures. The ISL28288 (Figure 39) is used to convert the differential thermocouple voltage into single-ended signal with 10X gain. The ISL28288's rail-to-rail input characteristic allows the thermocouple to be biased at ground and the amplifier to run from a single 5V supply.
R4 100k R3 R2 K TYPE THERMOCOUPLE 10k 10k V+ + ISL28288 V-
where: * PDMAXTOTAL is the sum of the maximum power dissipation of each amplifier in the package (PDMAX) * PDMAX for each amplifier can be calculated as follows:
V OUTMAX PD MAX = 2*V S x I SMAX + ( V S - V OUTMAX ) x --------------------------R
L
(EQ. 2)
where:
410V/C + 5V
* TMAX = Maximum ambient temperature * JA = Thermal resistance of the package * PDMAX = Maximum power dissipation of 1 amplifier * VS = Supply voltage * IMAX = Maximum supply current of 1 amplifier * VOUTMAX = Maximum output voltage swing of the application * RL = Load resistance
R1 100k
FIGURE 39. THERMOCOUPLE AMPLIFIER
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FN6339.0 September 20, 2006
ISL28288 Mini SO Package Family (MSOP)
0.25 M C A B D N A (N/2)+1
MDP0043
MINI SO PACKAGE FAMILY SYMBOL A A1 A2 MSOP8 1.10 0.10 0.86 0.33 0.18 3.00 4.90 3.00 0.65 0.55 0.95 8 MSOP10 1.10 0.10 0.86 0.23 0.18 3.00 4.90 3.00 0.50 0.55 0.95 10 TOLERANCE Max. 0.05 0.09 +0.07/-0.08 0.05 0.10 0.15 0.10 Basic 0.15 Basic Reference NOTES 1, 3 2, 3 Rev. C 6/99
E
E1
PIN #1 I.D.
b c D
B
1 (N/2)
E E1 e
e C SEATING PLANE 0.10 C N LEADS b
H
L L1 N
0.08 M C A B
NOTES: 1. Plastic or metal protrusions of 0.15mm maximum per side are not included. 2. Plastic interlead protrusions of 0.25mm maximum per side are not included. 3. Dimensions "D" and "E1" are measured at Datum Plane "H".
L1 A c SEE DETAIL "X"
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
A2 GAUGE PLANE L DETAIL X
0.25
A1
3 3
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 12
FN6339.0 September 20, 2006

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