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| (R) ISL28136 Data Sheet June 26, 2009 FN6153.4 5MHz, Single Precision Rail-to-Rail Input-Output (RRIO) Op Amp The ISL28136 is a low-power single operational amplifier optimized for single supply operation from 2.4V to 5.5V, allowing operation from one lithium cell or two Ni-Cd batteries. This device features a gain-bandwidth product of 5MHz and is unity-gain stable with a -3dB bandwidth of 13MHz. This device features an Input Range Enhancement Circuit (IREC), which enables it to maintain CMRR performance for input voltages greater than the positive supply. The input signal is capable of swinging 0.25V above the positive supply and to the negative supply with only a slight degradation of the CMRR performance. The output operation is rail-to-rail. The part typically draws less than 1mA supply current while meeting excellent DC accuracy, AC performance, noise and output drive specifications. Operation is guaranteed over -40C to +125C temperature range. Features * 5MHz Gain bandwidth product @ AV = 100 * 13MHz -3db unity gain bandwidth * 900A typical supply current * 150V maximum offset voltage (8 Ld SOIC) * 16nA typical input bias current * Down to 2.4V single supply voltage range * Rail-to-rail input and output * Enable pin * -40C to +125C operation * Pb-free (RoHS compliant) Applications * Low-end audio * 4mA to 20mA current loops * Medical devices * Sensor amplifiers Ordering Information PART NUMBER (Note) ISL28136FHZ-T7* ISL28136FHZ-T7A* ISL28136FBZ ISL28136FBZ-T7* PART MARKING GABP GABP 28136 FBZ 28136 FBZ PACKAGE (Pb-Free) 6 Ld SOT-23 6 Ld SOT-23 8 Ld SOIC 8 Ld SOIC PKG. DWG. # MDP0038 MDP0038 MDP0027 MDP0027 * ADC buffers * DAC output amplifiers Pinouts ISL28136 (6 LD SOT-23) TOP VIEW OUT 1 V- 2 IN+ 3 6 V+ 5 EN 4 INNC 1 IN- 2 IN+ 3 V- 4 + ISL28136 (8 LD SOIC) TOP VIEW 8 EN 7 V+ 6 OUT 5 NC *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is 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 (c) Intersil Americas Inc. 2007, 2008, 2009. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL28136 Absolute Maximum Ratings (TA = +25C) Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.75V 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 Rating Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3kV Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300V Thermal Information Thermal Resistance JA (C/W) 6 Ld SOT-23 Package . . . . . . . . . . . . . . . . . . . . . . . 230 8 Ld SO Package . . . . . . . . . . . . . . . . . . . . . . . . . . 110 Ambient Operating Temperature Range . . . . . . . . .-40C to +125C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . +125C Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. 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 Electrical Specifications V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open, TA = +25C unless otherwise specified. Boldface limits apply over the operating temperature range, -40C to +125C. Temperature data established by characterization. DESCRIPTION CONDITIONS MIN (Note 1) TYP MAX (Note 1) UNIT PARAMETER DC SPECIFICATIONS VOS Input Offset Voltage 8 Ld SOIC 6 Ld SOT-23 -150 -270 -400 -450 10 150 270 400 450 V V V/C 10 V OS --------------T IOS IB VCM CMRR PSRR AVOL Input Offset Voltage vs Temperature Input Offset Current TA = -40C to +85C Input Bias Current TA = -40C to +85C Common-Mode Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain Guaranteed by CMRR VCM = 0V to 5V V+ = 2.4V to 5.5V VO = 0.5V to 4V, RL = 100k to VCM VO = 0.5V to 4V, RL = 1k to VCM -10 -15 -10 -15 0 90 85 90 85 600 500 0.4 0 16 10 15 35 40 5 114 99 1770 140 3 70 4.99 4.98 4.92 4.89 0.8 4.994 4.94 0.9 10 RL = 10 to VCM 48 45 56 1.1 1.4 14 16 6 10 90 110 nA nA V dB dB V/mV V/mV mV mV V V mA A mA VOUT Maximum Output Voltage Swing Output low, RL = 100k to VCM Output low, RL = 1k to VCM Output high, RL = 100k to VCM Output high, RL = 1k to VCM IS,ON IS,OFF IO+ Supply Current, Enabled Supply Current, Disabled Short-Circuit Output Source Current Per Amp 2 FN6153.4 June 26, 2009 ISL28136 Electrical Specifications V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open, TA = +25C unless otherwise specified. Boldface limits apply over the operating temperature range, -40C to +125C. Temperature data established by characterization. (Continued) DESCRIPTION Short-Circuit Output Sink Current Supply Operating Range EN Pin High Level EN Pin Low Level EN Pin Input High Current EN Pin Input Low Current VEN = V+ VEN = V1 16 CONDITIONS RL = 10 to VCM V+ to VMIN (Note 1) 50 45 2.4 2 0.8 1.5 1.6 25 30 TYP 55 5.5 MAX (Note 1) UNIT mA V V V A nA PARAMETER IOVSUPPLY VENH VENL IENH IENL AC SPECIFICATIONS GBW Unity Gain Bandwidth eN Gain Bandwidth Product -3dB Bandwidth Input Noise Voltage Peak-to-Peak Input Noise Voltage Density iN CMRR PSRR+ to 120Hz PSRRto 120Hz Input Noise Current Density Input Common Mode Rejection Ratio Power Supply Rejection Ratio (V+) Power Supply Rejection Ratio (V-) AV = 100, RF = 100k, RG = 1k to VCM AV = 1, RF = 0, RL = 10k to VCM, VOUT = 10mVP-P f = 0.1Hz to 10Hz, RL = 10k to VCM fO = 1kHz, RL = 10k to VCM fO = 10kHz, RL = 10k to VCM fO = to 120Hz; VCM = 1VP-P, RL = 1k to VCM V+, V- = 1.2V and 2.5V, VSOURCE = 1VP-P, RL = 1k to VCM V+, V- = 1.2V and 2.5V VSOURCE = 1VP-P, RL = 1k to VCM 5 13 0.4 15 0.35 -90 -88 -105 MHz MHz VP-P nV/Hz pA/Hz dB dB dB TRANSIENT RESPONSE SR tr, tf, Large Signal Slew Rate Rise Time, 10% to 90%, VOUT Fall Time, 90% to 10%, VOUT tr, tf, Small Signal Rise Time, 10% to 90%, VOUT Fall Time, 90% to 10%, VOUT tEN VOUT = 1.5V; Rf = 50k, RG = 50k to VCM AV = +2, VOUT = 2VP-P, Rg = Rf = RL = 1k to VCM AV = +2, VOUT = 2VP-P, Rg = Rf = RL = 1k to VCM AV = +2, VOUT = 10mVP-P, Rg = Rf = RL = 1k to VCM AV = +2, VOUT = 10mVP-P, Rg = Rf = RL = 1k to VCM 1.9 0.6 0.5 65 62 5 0.3 V/s s s ns ns s s Enable to Output Turn-on Delay Time, 10% VEN = 5V to 0V, AV = +2, EN to 10% VOUT Rg = Rf = RL = 1k to VCM Enable to Output Turn-off Delay Time, 10% VEN = 0V to 5V, AV = +2, Rg = Rf = RL = 1k to VCM EN to 10% VOUT NOTE: 1. Parameters with MIN and/or MAX limits are 100% tested at +25C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 3 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 15 NORMALIZED GAIN (dB) 10 5 0 -5 -10 -15 100 V+ = 5V RL = 1k CL = 16.3pF AV = +2 VOUT = 10mVP-P 1k Rf = Rg = 1k Rf = Rg = 100k Rf = Rg = 10k V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open 1 0 NORMALIZED GAIN (dB) -1 -2 -3 -4 -5 -6 -7 -8 10M 100M VOUT = 1V VOUT = 100mV VOUT = 50mV VOUT = 10mV V+ = 5V RL = 1k CL = 16.3pF AV = +1 VOUT = 10mVP-P 100k 1M FREQUENCY (Hz) 10M 100M 10k 100k 1M FREQUENCY (Hz) -9 10k FIGURE 1. GAIN vs FREQUENCY vs FEEDBACK RESISTOR VALUES Rf/Rg FIGURE 2. GAIN vs FREQUENCY vs VOUT, RL = 1k 1 0 NORMALIZED GAIN (dB) -1 -2 -3 -4 -5 -6 -7 -8 NORMALIZED GAIN (dB) VOUT = 1V VOUT = 100mV VOUT = 50mV VOUT = 10mV V+ = 5V RL = 10k CL = 16.3pF AV = +1 VOUT = 10mVP-P 100k 1M FREQUENCY (Hz) 10M 100M 1 0 -1 -2 -3 -4 -5 -6 -7 -8 VOUT = 1V VOUT = 100mV VOUT = 50mV VOUT = 10mV V+ = 5V RL = 100k CL = 16.3pF AV = +1 VOUT = 10mVP-P 100k 1M FREQUENCY (Hz) 10M 100M -9 10k -9 10k FIGURE 3. GAIN vs FREQUENCY vs VOUT, RL = 10k FIGURE 4. GAIN vs FREQUENCY vs VOUT, RL = 100k 1 0 NORMALIZED GAIN (dB) -1 -2 -3 -4 -5 -6 -7 -8 V+ = 5V CL = 16.3pF AV = +1 VOUT = 10mVP-P 100k 1M FREQUENCY (Hz) 10M 100M RL = 1k RL = 10k GAIN (dB) RL = 100k 70 60 50 40 30 20 10 0 AV = 1 AV = 1, Rg = INF, Rf = 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M AV = 10 AV = 10, Rg = 1k, Rf = 9.09k AV = 101 AV = 101, Rg = 1k, Rf = 100k V+ = 5V CL = 16.3pF RL = 10k VOUT = 10mVP-P AV = 1001 AV = 1001, Rg = 1k, Rf = 1M -9 10k -10 100 FIGURE 5. GAIN vs FREQUENCY vs RL FIGURE 6. FREQUENCY RESPONSE vs CLOSED LOOP GAIN 4 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 1 0 NORMALIZED GAIN (dB) -1 -2 -3 -4 -5 -6 -7 -8 RL = 10k CL = 16.3pF AV = +1 VOUT = 10mVP-P 100k 1M FREQUENCY (Hz) 10M 100M V+ = 2.4V V+ = 5V NORMALIZED GAIN (dB) V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued) 8 7 6 5 4 3 2 1 0 -1 -2 -3 V+ = 5V -4 RL = 1k -5 A = +1 V -6 VOUT = 10mVP-P -7 -8 10k 100k CL = 51.7pF CL = 43.7pF CL = 37.7pF CL = 26.7pF CL = 16.7pF CL = 4.7pF -9 10k 1M FREQUENCY (Hz) 10M 100M FIGURE 7. GAIN vs FREQUENCY vs SUPPLY VOLTAGE FIGURE 8. GAIN vs FREQUENCY vs CL 20 0 -20 PSRR (dB) -40 -60 -80 -100 10 V+ = 2.4V, 5V RL = 1k CL = 16.3pF AV = +1 VCM = 1VP-P 100 1k 10k 100k 1M 10M 20 0 -20 -40 -60 -80 -100 -120 10 V+, V- = 1.2V RL = 1k CL = 16.3pF AV = +1 VSOURCE = 1VP-P PSRR- CMRR (dB) PSRR+ 100 1k 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) FIGURE 9. CMRR vs FREQUENCY; V+ = 2.4V AND 5V FIGURE 10. PSRR vs FREQUENCY, V+, V- = 1.2V 20 INPUT VOLTAGE NOISE (nVHz) V+, V- = 2.5V 0 RL = 1k CL = 16.3pF -20 A = +1 V VSOURCE = 1VP-P -40 -60 PSRR+ -80 -100 -120 10 100 V+ = 5V RL = 1k CL = 16.3pF AV = +1 PSRR (dB) PSRR- 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 1 10 100 1k FREQUENCY (Hz) 10k 100k FIGURE 11. PSRR vs FREQUENCY, V+, V- = 2.5V FIGURE 12. INPUT VOLTAGE NOISE DENSITY vs FREQUENCY 5 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 10 INPUT CURRENT NOISE (pAHz) V+ = 5V RL = 1k CL = 16.3pF AV = +1 1 V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued) 0.5 0.4 0.3 INPUT NOISE (V) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 V+ = 5V RL = 10k CL = 16.3pF Rg = 10, Rf = 100k AV = 10000 0.1 1 10 100 1k FREQUENCY (Hz) 10k 100k -0.5 0 1 2 3 4 5 6 7 8 9 10 TIME (s) FIGURE 13. INPUT CURRENT NOISE DENSITY vs FREQUENCY FIGURE 14. INPUT VOLTAGE NOISE 0.1Hz TO 10Hz 1.5 1.0 LARGE SIGNAL (V) SMALL SIGNAL (V) 0.5 0 -0.5 -1.0 -1.5 V+, V- = 2.5V RL = 1k CL = 16.3pF Rg = Rf = 10k AV = 2 VOUT = 1.5VP-P 0 1 2 3 4 5 6 TIME (s) 7 8 9 10 0.026 0.024 0.022 0.020 0.018 0.016 0.014 0.012 0 V+, V- = 2.5V RL = 1k CL = 16.3pF Rg= Rf = 10k AV = 2 VOUT = 10mVP-P 0.5 1.0 1.5 2.0 2.5 TIME (s) 3.0 3.5 4.0 FIGURE 15. LARGE SIGNAL STEP RESPONSE FIGURE 16. SMALL SIGNAL STEP RESPONSE 6 V-ENABLE 5 V-ENABLE (V) 4 3 2 1 0 -1 0 10 20 30 40 50 60 TIME (s) 70 80 90 V+ = 5V Rg = Rf = RL = 1k CL = 16.3pF AV = +2 VOUT = 1VP-P V-OUT 1.3 1.1 0.9 OUTPUT (V) 0.7 0.5 0.3 0.1 -0.1 100 100 80 60 40 VOS (V) 20 0 -20 -40 -60 -80 -100 -1 0 1 2 3 VCM (V) 4 5 6 V+ = 5V RL = OPEN Rf = 100k, Rg = 100 AV = +1000 FIGURE 17. ENABLE TO OUTPUT RESPONSE FIGURE 18. INPUT OFFSET VOLTAGE vs COMMON-MODE INPUT VOLTAGE 6 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 100 80 60 CURRENT (A) 40 I-BIAS (nA) 20 0 -20 -40 -60 -80 -100 -1 0 1 V+ = 5V RL = OPEN Rf = 100k, Rg = 100 AV = +1000 2 3 VCM (V) 4 5 6 1100 1000 900 800 700 600 -40 MAX MEDIAN V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued) 1200 N = 1150 MIN -20 0 20 40 60 80 100 120 TEMPERATURE (C) FIGURE 19. INPUT OFFSET CURRENT vs COMMON-MODE INPUT VOLTAGE FIGURE 20. SUPPLY CURRENT ENABLED vs TEMPERATURE, V+, V- = 2.5V 11 N = 1150 10 CURRENT (A) 9 8 7 6 MIN 5 4 -40 -20 0 20 40 60 80 100 120 MEDIAN VOS (V) MAX 400 300 200 100 N = 1150 MAX MEDIAN 0 -100 -200 MIN -300 -400 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) TEMPERATURE (C) FIGURE 21. SUPPLY CURRENT DISABLED vs TEMPERATURE, V+, V- = 2.5V FIGURE 22. VOS vs TEMPERATURE, V+, V- = 2.5V, SOT PACKAGE 300 250 200 150 VOS (V) 100 50 0 -50 -100 -150 -200 -250 -40 -20 0 20 MIN MEDIAN MAX N = 1150 400 300 200 VOS (V) 100 MEDIAN 0 -100 -200 MIN -300 N = 1150 -400 -40 MAX 40 60 80 100 120 -20 0 20 40 60 80 100 120 TEMPERATURE (C) TEMPERATURE (C) FIGURE 23. VOS vs TEMPERATURE, V+, V- = 2.5V, SOIC PACKAGE FIGURE 24. VOS vs TEMPERATURE, V+, V- = 1.2V, SOT PACKAGE 7 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 300 250 200 150 IBIAS+ (nA) VOS (V) 100 50 0 -50 -100 -150 -200 -250 -40 -20 0 20 40 60 80 100 120 MIN MEDIAN MAX V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued) N = 1150 30 25 MAX 20 15 10 5 0 -5 -10 -40 -20 0 MIN 20 40 60 80 TEMPERATURE (C) MEDIAN N = 1150 100 120 TEMPERATURE (C) FIGURE 25. VOS vs TEMPERATURE, V+, V- = 1.2VSOIC PACKAGE FIGURE 26. , IBIAS+ vs TEMPERATURE, V+, V- = 2.5V 30 25 MAX 20 IBIAS+ (nA) IBIAS- (nA) 15 10 5 0 -5 N = 1150 -10 -40 -20 0 20 40 60 80 100 120 MIN MEDIAN 15 MAX 10 5 0 MEDIAN -5 -10 -15 -20 -25 -40 -20 0 20 MIN 40 60 80 N = 1150 100 120 TEMPERATURE (C) TEMPERATURE (C) FIGURE 27. IBIAS- vs TEMPERATURE, V+, V- = 2.5V FIGURE 28. IBIAS+ vs TEMPERATURE, V+, V- = 1.2V 20 N = 1150 15 10 IBIAS- (nA) 5 IOS (nA) 0 MEDIAN -5 -10 -15 -20 -25 -40 -20 0 20 40 60 80 100 120 MIN MAX 10 8 MAX 6 4 2 0 -2 -4 -6 -8 -40 -20 0 20 40 60 80 TEMPERATURE (C) MIN N = 1150 100 120 MEDIAN TEMPERATURE (C) FIGURE 29. IBIAS- vs TEMPERATURE, V+, V- = 1.2V FIGURE 30. IOS vs TEMPERATURE, V+, V- = 2.5V 8 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 12 10 8 6 IOS (nA) 4 2 0 -2 -4 -6 -8 -40 -20 0 20 40 60 80 TEMPERATURE (C) MIN MEDIAN CMRR (dB) MAX N = 1150 V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued) 140 135 130 125 120 115 110 105 100 95 120 90 -40 -20 0 20 40 60 80 MIN N = 1150 100 120 TEMPERATURE (C) MEDIAN MAX 100 FIGURE 31. IOS vs TEMPERATURE, V+, V- = 1.2V FIGURE 32. CMRR vs TEMPERATURE, VCM = -2.5V TO +2.5V, V+, V- = 2.5V 120 115 MAX AVOL (V/mV) 110 PSRR (dB) 105 MEDIAN 100 95 MIN 90 -40 -20 0 20 40 60 80 TEMPERATURE (C) N = 1150 100 120 4500 4000 3500 3000 2500 2000 MEDIAN 1500 1000 MIN 500 0 -40 -20 0 20 40 60 80 N = 1150 100 120 MAX TEMPERATURE (C) FIGURE 33. PSRR vs TEMPERATURE, V+, V- = 1.2V TO 2.75V FIGURE 34. AVOL vs TEMPERATURE, V+, V- = 2.5V, VO = -2V TO +2V, RL = 100k 200 180 MAX 160 AVOL (V/mV) MEDIAN 140 120 100 MIN 80 N = 1150 60 -40 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 VOUT (V) 4.960 MAX 4.955 4.950 MEDIAN 4.945 4.940 MIN 4.935 4.930 -40 N = 1150 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 FIGURE 35. AVOL vs TEMPERATURE, V+, V- = 2.5V, VO = -2V TO +2V, RL = 1k FIGURE 36. VOUT HIGH vs TEMPERATURE, V+, V- = 2.5V, RL = 1k 9 FN6153.4 June 26, 2009 ISL28136 Typical Performance Curves 75 70 MAX VOUT (m V) 65 60 MEDIAN 55 MIN 50 N = 1150 45 -40 -20 0 20 40 60 80 100 120 V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued) TEMPERATURE (C) FIGURE 37. VOUT LOW vs TEMPERATURE, V+, V- = 2.5V, RL = 1k Pin Descriptions ISL28136 (6 Ld SOT-23) ISL28136 (8 Ld SOIC) 1, 5 4 2 PIN NAME NC INFUNCTION Not connected inverting input V+ EQUIVALENT CIRCUIT IN- IN+ VCircuit 1 3 2 3 4 IN+ V- Non-inverting input Negative supply V+ See Circuit 1 CAPACITIVELY COUPLED ESD CLAMP VCircuit 2 1 6 OUT Output V+ OUT VCircuit 3 6 5 7 8 V+ EN Positive supply Chip enable See Circuit 2 V+ LOGIC PIN VCircuit 3 10 FN6153.4 June 26, 2009 ISL28136 Applications Information Introduction The ISL28136 is a single channel Bi-CMOS rail-to-rail input, output (RRIO) micropower precision operational amplifier. The part is designed to operate from a single supply 2.4V to 5.5V. The part has an input common mode range that extends 0.25V above the positive rail and down to the negative supply rail. The output operation can swing within about 3mV of the supply rails with a 100k load. external series resistor must be used to ensure the input currents never exceed 5mA (Figure 38). VIN RIN + RL VOUT FIGURE 38. INPUT CURRENT LIMITING Rail-to-Rail Input 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 ISL28136 achieves input rail-to-rail operation without sacrificing important precision specifications and degrading distortion performance. The device's input offset voltage exhibits a smooth behavior throughout the entire commonmode input range. The input bias current versus the common-mode voltage range gives an undistorted behavior from typically down to the negative rail to 0.25V higher than the positive rail. Enable/Disable Feature The ISL28136 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 10A at room temperature. The EN pin 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 EN pin should never be left floating. When not used, the EN pin should either be left floating or connected to the V- pin. By disabling the part, multiple ISL28136 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 loading effects of the feedback resistors of the disabled amplifier must be considered when multiple amplifier outputs are connected together. Note that feed through from the IN+ to IN- pins occurs on any Mux Amp disabled channel where the input differential voltage exceeds 0.5V (e.g., active channel VOUT = 1V, while disabled channel VIN = GND), so the mux implementation is best suited for small signal applications. If large signals are required, use series IN+ resistors, or a large value RF, to keep the feed through current low enough to minimize the impact on the active channel. See"Limitations of the Differential Input Protection" on page 11 for more details. Rail-to-Rail Output A pair of complementary bi-polar devices are used to achieve the rail-to-rail output swing. The PNP sinks current to swing the output in the negative direction. The NPN sources current to swing the output in the positive direction. The ISL28136 with a 100k load will swing to within 3mV of the positive supply rail and within 3mV of the negative supply rail. Results of Over-Driving the Output Caution should be used when over-driving the output for long periods of time. Over-driving the output can occur in two ways. 1) The input voltage times the gain of the amplifier exceeds the supply voltage by a large value or, 2) the output current required is higher than the output stage can deliver. These conditions can result in a shift in the Input Offset Voltage (VOS) as much as 1V/hr. of exposure under these conditions. Limitations of the Differential Input Protection If the input differential voltage is expected to exceed 0.5V, an external current limiting resistor must be used to ensure the input current never exceeds 5mA. For non-inverting unity gain applications, the current limiting can be via a series IN+ resistor, or via a feedback resistor of appropriate value. For other gain configurations, the series IN+ resistor is the best choice, unless the feedback (RF) and gain setting (RG) resistors are both sufficiently large to limit the input current to 5mA. Large differential input voltages can arise from several sources: 1) During open loop (comparator) operation. Used this way, the IN+ and IN- voltages don't track, so differentials arise. 2) When the amplifier is disabled but an input signal is still present. An RL or RG to GND keeps the IN- at GND, while the varying IN+ signal creates a differential voltage. Mux Amp applications are similar, except that the active channel VOUT determines the voltage on the IN- terminal. IN+ and IN- 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. They also contain back-to-back diodes across the input terminals (see "Pin Descriptions" on page 10 - Circuit 1). For applications where the input differential voltage is expected to exceed 0.5V, an 11 FN6153.4 June 26, 2009 ISL28136 3) When the slew rate of the input pulse is considerably faster than the op amp's slew rate. If the VOUT can't keep up with the IN+ signal, a differential voltage results, and visible distortion occurs on the input and output signals. To avoid this issue, keep the input slew rate below 1.9V/s, or use appropriate current limiting resistors. Large (>2V) differential input voltages can also cause an increase in disabled ICC. where: * PDMAXTOTAL is the sum of the maximum power dissipation of each amplifier in the package (PDMAX) * PDMAX for each amplifier can be calculated using Equation 2: V OUTMAX PD MAX = 2*V S x I SMAX + ( V S - V OUTMAX ) x --------------------------R L (EQ. 2) Current Limiting These devices have 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. where: * TMAX = Maximum ambient temperature * JA = Thermal resistance of the package * PDMAX = Maximum power dissipation of 1 amplifier * VS = Supply voltage (Magnitude of V+ and V-) * IMAX = Maximum supply current of 1 amplifier * VOUTMAX = Maximum output voltage swing of the application * RL = Load resistance Power Dissipation It is possible to exceed the +125C 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 in Equation 1: T JMAX = T MAX + ( JA xPD MAXTOTAL ) (EQ. 1) 12 FN6153.4 June 26, 2009 ISL28136 Small Outline Package Family (SO) A D N (N/2)+1 h X 45 A E E1 PIN #1 I.D. MARK c SEE DETAIL "X" 1 B (N/2) L1 0.010 M C A B e C H A2 GAUGE PLANE A1 0.004 C 0.010 M C A B b DETAIL X SEATING PLANE L 4 4 0.010 MDP0027 SMALL OUTLINE PACKAGE FAMILY (SO) INCHES SYMBOL A A1 A2 b c D E E1 e L L1 h N NOTES: 1. Plastic or metal protrusions of 0.006" maximum per side are not included. 2. Plastic interlead protrusions of 0.010" maximum per side are not included. 3. Dimensions "D" and "E1" are measured at Datum Plane "H". 4. Dimensioning and tolerancing per ASME Y14.5M-1994 SO-8 0.068 0.006 0.057 0.017 0.009 0.193 0.236 0.154 0.050 0.025 0.041 0.013 8 SO-14 0.068 0.006 0.057 0.017 0.009 0.341 0.236 0.154 0.050 0.025 0.041 0.013 14 SO16 (0.150") 0.068 0.006 0.057 0.017 0.009 0.390 0.236 0.154 0.050 0.025 0.041 0.013 16 SO16 (0.300") (SOL-16) 0.104 0.007 0.092 0.017 0.011 0.406 0.406 0.295 0.050 0.030 0.056 0.020 16 SO20 (SOL-20) 0.104 0.007 0.092 0.017 0.011 0.504 0.406 0.295 0.050 0.030 0.056 0.020 20 SO24 (SOL-24) 0.104 0.007 0.092 0.017 0.011 0.606 0.406 0.295 0.050 0.030 0.056 0.020 24 SO28 (SOL-28) 0.104 0.007 0.092 0.017 0.011 0.704 0.406 0.295 0.050 0.030 0.056 0.020 28 TOLERANCE MAX 0.003 0.002 0.003 0.001 0.004 0.008 0.004 Basic 0.009 Basic Reference Reference NOTES 1, 3 2, 3 Rev. M 2/07 13 FN6153.4 June 26, 2009 ISL28136 SOT-23 Package Family e1 A N 6 4 MDP0038 D SOT-23 PACKAGE FAMILY MILLIMETERS SYMBOL A A1 SOT23-5 1.45 0.10 1.14 0.40 0.14 2.90 2.80 1.60 0.95 1.90 0.45 0.60 5 SOT23-6 1.45 0.10 1.14 0.40 0.14 2.90 2.80 1.60 0.95 1.90 0.45 0.60 6 TOLERANCE MAX 0.05 0.15 0.05 0.06 Basic Basic Basic Basic Basic 0.10 Reference Reference Rev. F 2/07 NOTES: E1 2 3 E A2 b c 0.20 C 0.15 C D 2X 5 e B b NX 1 2 3 2X 0.20 M C A-B D D E E1 e e1 L L1 N 0.15 C A-B 2X C D 1 3 A2 SEATING PLANE 0.10 C NX A1 1. Plastic or metal protrusions of 0.25mm maximum per side are not included. 2. Plastic interlead protrusions of 0.25mm maximum per side are not included. 3. This dimension is measured at Datum Plane "H". 4. Dimensioning and tolerancing per ASME Y14.5M-1994. 5. Index area - Pin #1 I.D. will be located within the indicated zone (SOT23-6 only). (L1) H 6. SOT23-5 version has no center lead (shown as a dashed line). A GAUGE PLANE c L 0 +3 -0 0.25 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 14 FN6153.4 June 26, 2009 |
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