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ISL28158, ISL28258
Data Sheet August 29, 2008 FN6377.3
Micro-power Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps
The ISL28158 and ISL28258 are micro-power precision operational amplifiers optimized for single supply operation at 5.5V and can operate down to 2.4V. These devices feature an Input Range Enhancement Circuit (IREC), which enables them 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 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail-to-rail. The ISL28158 and ISL28258 draw minimal supply current while meeting excellent DC-accuracy noise and output drive specifications. Competing devices seriously degrade these parameters to achieve micro-power supply current. Offset current, voltage and current noise, slew rate, and gain bandwidth product are all two to ten times better than on previous micro-power op amps. The 1/f corner of the voltage noise spectrum is at 100Hz. This results in low frequency noise performance, which can only be found on devices with an order of magnitude higher supply current. ISL28158 and ISL28258 can be operated from one lithium cell or two Ni-Cd batteries. The input range includes both positive and negative rail. The output swings to both rails.
Features
* 34A typical supply current (ISL28158) * 68A typical supply current (ISL28258) * 300V maximum offset voltage (8 Ld SOIC) * 1pA typical input bias current * 200kHz gain bandwidth product * 2.4V to 5.5V single supply voltage range * Rail-to-rail input and output * Enable pin (ISL28158 only) * Pb-free (RoHS compliant)
Applications
* Battery- or solar-powered systems * 4mA to 20mA current loops * Handheld consumer products * Medical devices * Sensor amplifiers * ADC buffers * DAC output amplifiers
Ordering Information
PART NUMBER (Note) ISL28158FHZ-T7* PART MARKING GABW GABW 28158 FBZ 28158 FBZ 28258 FBZ 28258 FBZ 8258Z 8258Z PACKAGE (Pb-free) 6 Ld SOT-23 6 Ld SOT-23 8 Ld SOIC 8 Ld SOIC 8 Ld SOIC 8 Ld SOIC 8 Ld MSOP 8 Ld MSOP PKG. DWG. # MDP0038 MDP0038 MDP0027 MDP0027 MDP0027 MDP0027 MDP0043 MDP0043
Pinouts
ISL28158 (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 +
ISL28158 (8 LD SOIC) TOP VIEW
8 EN 7 V+ 6 OUT
ISL28158FHZ-T7A* ISL28158FBZ ISL28158FBZ-T7* ISL28258FBZ ISL28258FBZ-T7* ISL28258FUZ
5 NC
+-
ISL28258FUZ-T7*
*Please refer to TB347 for details on reel specifications. ISL28258 (8 LD SOIC) TOP VIEW
OUT_A 1 IN-_A 2 IN+_A 3 V- 4 -+ +8 V+ 7 OUT_B 6 IN-_B 5 IN+_B OUT_A 1 IN-_A 2 IN+_A 3 V- 4 -+ +-
ISL28258 (8 LD MSOP) TOP VIEW
8 V+ 7 OUT_B 6 IN-_B 5 IN+_B
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. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
ISL28158, ISL28258
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 Charge Device Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1500V
Thermal Information
Thermal Resistance (Typical, Note 1) JA (C/W) 6 Ld SOT-23 Package . . . . . . . . . . . . . . . . . . . . . . . 230 8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 120 8 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . . . 160 Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite 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.
NOTE: 1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
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 2) TYP MAX (Note 2) UNIT
PARAMETER DC SPECIFICATIONS VOS
Input Offset Voltage
8 Ld SOIC 6 Ld SOT-23 8 Ld MSOP
-300 -650 -550 -750 -350 -700
3.1 5 3 0.3
300 650 550 750 350 700
V V V V/C
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 4.5V, RL = 100k to VCM VO = 0.5V to 4.5V, RL = 1k to VCM -35 -80 -30 -80 0 75 70 80 75 100 75
5 1
35 80 30 80 5
pA pA V dB dB V/mV V/mV
98 98 220 45 5.3 135 6 20 150 250
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 4.992 4.990 4.84 4.77
mV mV V V
4.996 4.874
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FN6377.3 August 29, 2008
ISL28158, ISL28258
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 Quiescent Supply Current CONDITIONS V+ = 5V, Enable (ISL28158) V+ = 5V (ISL28258) IS,OFF IO+ IOVSUPPLY VENH VENL IENH IENL Quiescent Supply Current, Disabled (ISL28158) Short-Circuit Output Source Current Short-Circuit Output Sink Current Supply Operating Range EN Pin High Level (ISL28158) EN Pin Low Level (ISL28158) EN Pin Input High Current (ISL28158) EN Pin Input Low Current (ISL28158) VEN = V+ VEN = V1 12 RL = 10 to VCM RL = 10 to VCM V+ to V2.4 2 0.8 1.5 1.6 25 30 27 20 MIN (Note 2) TYP 34 68 10 30 -25 -22 -15 5.5 MAX (Note 2) 43 55 86 110 14 19 UNIT A A A mA mA V V V A nA
PARAMETER IS,ON
AC SPECIFICATONS GBW Unity Gain Bandwidth eN Gain Bandwidth Product -3dB Bandwidth Input Noise Voltage Peak-to-Peak Input Noise Voltage Density iN 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-) AV = 100, RF = 100k, RG = 1k, RL = 10k to VCM AV =1, RF = 0, VOUT = 10mVP-P f = 0.1Hz to 10Hz fO = 1kHz fO = 10kHz VCM = 1VP-P, RL = 10k to VCM V+, V- = 1.2V and 2.5V, VSOURCE = 1VP-P, RL = 10k to VCM V+, V- = 1.2V and 2.5V VSOURCE = 1VP-P, RL = 10k to VCM 200 420 1.4 64 0.19 -70 -64 -85 kHz kHz 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 AV = +2, VOUT = 1VP-P, Rg = Rf = 10k RL = 10k to VCM AV = +2, VOUT = 1VP-P, Rg = Rf = 10k RL = 10k to VCM AV = +2, VOUT = 10mVP-P, Rg = Rf = RL = 10k to VCM 0.1 10 9 650 640 15 0.5 V/s s s ns ns s s
AV = +2, VOUT = 10mVP-P, Rg = Rf = RL = 10k to VCM
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, EN to 10% VOUT Rg = Rf = RL = 1k to VCM
NOTE: 2. 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.
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
1 0 NORMALIZED GAIN (dB) Rf = Rg = 499 Rf = Rg = 1k NORMALIZED GAIN (dB) 100k 1M -1 -2 -3 -4 -5 -6 -7 -8 -9 10 100 1k V+ = 5V RL = 1k CL = 16.3pF AV = +2 VOUT = 10mVP-P 4 VOUT = 10mV 3 2 VOUT = 50mV 1 0 -1 VOUT = 100mV -2 -3 V = 5V + -4 RL = 1k -5 CL = 16.3pF VOUT = 1V -6 AV = +1 -7 VOUT = 10mVP-P -8 1k 10k 100k FREQUENCY (Hz)
Rf = Rg = 10k Rf = Rg = 4.99k 10k FREQUENCY (Hz)
1M
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 -9 VOUT = 10mV VOUT = 50mV VOUT = 100mV VOUT = 1V V+ = 5V RL = 10k CL = 16.3pF AV = +1 VOUT = 10mVP-P 1k 10k 100k FREQUENCY (Hz) 1M NORMALIZED GAIN (dB)
1 0 -1 -2 -3 -4 VOUT = 10mV VOUT = 50mV VOUT = 100mV
VOUT = 1V -5 V+ = 5V -6 RL = 100k CL = 16.3pF -7 AV = +1 -8 V OUT = 10mVP-P -9 1k 10k 100k FREQUENCY (Hz)
1M
FIGURE 3. GAIN vs FREQUENCY vs VOUT, RL = 10k
FIGURE 4. GAIN vs FREQUENCY vs VOUT, RL = 100k
4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -6 1k V+ = 5V CL = 16.3pF AV = +1 VOUT = 10mVP-P RL = 100k RL = 1k RL = 10k GAIN (dB)
70 60 50 40 30 20 10 AV = 1 0 1M -10 10 100 AV = 10 AV = 101 AV = 1001
AV = 1, Rg = INF, Rf = 0 AV = 10, Rg = 1k, Rf = 9.09k AV = 101, Rg = 1k, Rf = 100k AV = 1001, Rg = 1k, Rf = 1M V+ = 5V CL = 16.3pF RL = 10k VOUT = 10mVP-P
10k 100k FREQUENCY (Hz)
1k 10k FREQUENCY (Hz)
100k
1M
FIGURE 5. GAIN vs FREQUENCY vs RL
FIGURE 6. FREQUENCY RESPONSE vs CLOSED LOOP GAIN
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
1 0 NORMALIZED GAIN (dB) -1 -2 -3 -4 -5 -6 -7 -8 1k RL = 10k CL = 16.3pF AV = +1 VOUT = 10mVP-P 10k 100k FREQUENCY (Hz) 1M V+ = 2.4V V+ = 5V NORMALIZED GAIN (dB) 8 6 4 2 0 -2 -4 V+ = 5V -6 RL = 10k AV = +1 -8 V OUT = 10mVP-P -10 1k CL = 43.3pF CL = 34.3pF CL = 16.3pF CL = 98.3pF CL = 72.3pF CL = 55.3pF
(Continued)
10k 100k FREQUENCY (Hz)
1M
FIGURE 7. GAIN vs FREQUENCY vs SUPPLY VOLTAGE
FIGURE 8. GAIN vs FREQUENCY vs CL
10 0 -10 -20 CMRR (dB) -30 -40 -50 -60 -70 -80 -90 10 100 1k 10k FREQUENCY (Hz) V+ = 2.4V, 5V RL = 10k CL = 16.3pF AV = +1 VCM = 1VP-P 100k 1M PSRR (dB)
10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 10 100 1k 10k FREQUENCY (Hz) V+ = 2.4V RL = 10k CL = 16.3pF AV = +1 VCM = 1VP-P 100k 1M PSRRPSRR+
FIGURE 9. CMRR vs FREQUENCY, V+ = 2.4V AND 5V
FIGURE 10. PSRR vs FREQUENCY, V+, V- = 1.2V
10 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 -90 -100 10 100 1k 10k V+ = 5V RL = 10k CL = 16.3pF AV = +1 VCM = 1VP-P 100k 1M FREQUENCY (Hz) PSRR+ PSRRINPUT VOLTAGE NOISE (nV/Hz) 0
1000 V+ = 5V RL = 10k CL = 16.3pF AV = +1 100
10
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FIGURE 11. PSRR vs FREQUENCY, V+, V- = 2.5V
FIGURE 12. INPUT VOLTAGE NOISE DENSITY vs FREQUENCY
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
10 INPUT CURRENT NOISE (pA/Hz) V+ = 5V RL = 10k CL = 16.3pF AV = +1 1 0 -0.2 INPUT NOISE (V) -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 0.1 1 10 100 1k FREQUENCY (Hz) 10k 100k -1.6 0 1 2 3 4 5 6 TIME (s) 7 8 9 10
(Continued)
RL = 10k V+ = 5V CL = 16.3pF AV = 1000 Rg = 100, Rf = 100k
FIGURE 13. INPUT CURRENT NOISE DENSITY vs FREQUENCY
FIGURE 14. INPUT VOLTAGE NOISE 0.1Hz TO 10Hz
0.6 0.4 LARGE SIGNAL (V) SMALL SIGNAL (V) 0.2 0 -0.2 -0.4 -0.6 0 50 100 150 200 250 TIME (s) 300 350 400
0.020 0.018 0.016 0.014 0.012 0.010 0.008 0.006 0 50 100 V+, V- = 2.5V RL = 10k CL = 16.3pF Rg = Rf = 10k AV = 2 VOUT = 10mVP-P 150 200 250 TIME (s) 300 350 400
V+, V- = 2.5V RL = 10k CL = 16.3pF Rg = Rf = 10k AV = 2 VOUT = 1VP-P
FIGURE 15. LARGE SIGNAL STEP RESPONSE
FIGURE 16. SMALL SIGNAL STEP RESPONSE
6 V-ENABLE 5 4 V-ENABLE (V) 3 2 1 0 -1 V+ = 5V Rg = Rf = 10k CL = 16.3pF AV = +2 VOUT = 1VP-P RL = 10k V-OUT
1.2 1.0 0.8 0.6 0.4 0.2 0 -0.2 400 OUTPUT (V)
0
50
100
150
200 250 TIME (s)
300
350
FIGURE 17. ENABLE TO OUTPUT RESPONSE
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
500 400 300 200 100 0 -100 -200 -300 -400 -500 -1 0 1 2 3 VCM (V) 4 5 6 V+ = 5V RL = OPEN Rf = 100k, Rg = 100 AV = +1000 I-BIAS (pA) VOS (V) 100 80 60 40 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
(Continued)
FIGURE 18. INPUT OFFSET VOLTAGE vs COMMON MODE INPUT VOLTAGE
FIGURE 19. INPUT BIAS CURRENT vs COMMON MODE INPUT VOLTAGE
50 N = 1000 45 MAX CURRENT (A) CURRENT (A) 40 MEDIAN 35 MIN 30 25 20 -40
80 N = 12 75 70 65 MEDIAN 60 MIN 55 50 -40
MAX
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 20. SUPPLY CURRENT ENABLED (SINGLE) vs TEMPERATURE, V+, V- = 2.5V
FIGURE 21. SUPPLY CURRENT (DUAL) vs TEMPERATURE, V+, V- = 2.5V
14 13 12 CURRENT (A) N = 1000 MAX 11 10 9 8 7 6 5 -40 -20 0 20 40 60 80 100 120 MIN MEDIAN VOS (V)
500 N = 1000 300 MAX 100 -100 MIN -300 -500 -700 -40 MEDIAN
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 22. SUPPLY CURRENT DISABLED (SINGLE) vs TEMPERATURE, V+, V- = 2.5V
FIGURE 23. VOS (SOIC PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 2.75V
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
500 N = 1000 300 MAX 100 VOS (V) -100 MIN -300 -500 -700 -40 VOS (V) MEDIAN 500 300 100 -100 MIN -300 -500 -700 -40 -20 0 20 40 60 80 100 120 MAX MEDIAN 700 N = 1000
(Continued)
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 24. VOS (SOIC PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 2.5V
FIGURE 25. VOS (SOIC PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 1.2V
800 600 400 200 VOS (V) 0 -200 -400 -600
N = 1000
1000 MAX 800 600 400 VOS (V) MEDIAN 200 0 -200 -400 MIN -600 -800 -1000 MIN MEDIAN N = 1000 MAX
-800 -1000 -40 -20 0 20 40 60 80 100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 26. VOS (SOT PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 2.75V
FIGURE 27. VOS (SOT PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 2.5V
1000 800 600 400 VOS (V)
N = 1000 MAX
600 N = 12 400 200 MEDIAN VOS (V) 0 -200 MIN MIN -400 -600 -40
200 0 -200 -400 -600 -800 -1000 -40 -20 0
MAX MEDIAN
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 28. VOS (SOT PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 1.2V
FIGURE 29. VOS (MSOP PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 2.5V
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
600 N = 12 400 200 VOS (V) 0 -200 -400 -600 -40 200 MAX MEDIAN 150 IBIAS+ (pA) 100 50 0 -50 -40 MIN MEDIAN 250 N = 1000 MAX
(Continued)
MIN
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 30. VOS (MSOP PKG) vs TEMPERATURE, VIN = 0V, V+, V- = 1.2V
FIGURE 31. IBIAS+ vs TEMPERATURE, V+, V- = 2.5V
500 450 400 350 IBIAS- (pA) 300 250 200 150 100 50 0 -50 -40
350 N = 1000 MAX MEDIAN IBIAS+ (pA) 200 150 100 MIN 50 0 -20 0 20 40 60 80 100 120 -50 -40 -20 0 20 40 60 80 100 120 300 250 MEDIAN N = 1000 MAX
MIN
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 32. IBIAS- vs TEMPERATURE, V+, V- = 2.5V
FIGURE 33. IBIAS+ vs TEMPERATURE, V+, V- = 1.2V
450 400 350 300 IBIAS- (pA) 250 200 150 100 50 0
N = 1000
20 MAX 0 -20 MEDIAN IOS (pA) -40 -60 -80 -100 -120 -140
N = 1000
MAX MEDIAN
MIN
MIN
-50 -40
-20
0
20
40
60
80
100
120
-160 -40
-20
0
TEMPERATURE (C)
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 34. IBIAS- vs TEMPERATURE, V+, V- = 1.2V
FIGURE 35. IOS vs TEMPERATURE, V+, V- = 2.5
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
30 N = 1000 10 -10 CMRR (dB) -30 IOS (pA) -50 -70 -90 -110 -130 -150 -40 -20 0 20 40 60 MIN 80 100 120 70 -40 MIN -20 0 20 40 60 80 100 120 MEDIAN MAX 120 110 100 90 MEDIAN 140 130 MAX
(Continued)
N = 1000
80
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 36. IOS vs TEMPERATURE, V+, V- = 1.2V
FIGURE 37. CMRR vs TEMPERATURE, VCM = -2.5V TO +2.5V, V+, V- = 2.5V
140 130 120 110 100 90
N = 1000 MAX
450 N = 1000 400 MAX 350 AVOL (V/mV) 300 250 200 150 100 -40 MIN MEDIAN
PSRR (dB)
MEDIAN
MIN -20 0 20 40 60 80 TEMPERATURE (C) 100 120
80 -40
-20
0
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 38. PSRR vs TEMPERATURE, V+, V- = 1.2V TO 2.75V
FIGURE 39. AVOL vs TEMPERATURE, V+, V- = 2.5V, VO = -2V TO +2V, RL = 100k
70 65 60 55 AVOL (V/mV) 50 45 40 35 30 25 20 -40 -20 0 20 40 60 80 TEMPERATURE (C) MIN MEDIAN MAX
4.92 N = 1000 4.91 4.90 VOUT (V) 4.89 4.88 4.87 4.86 4.85 4.84 -40 -20 0 20 40 60 80 100 120 MIN MAX MEDIAN N = 1000
100
120
TEMPERATURE (C)
FIGURE 40. AVOL vs TEMPERATURE, V+, V- = 2.5V, VO = -2V TO +2V, RL = 1k
FIGURE 41. VOUT HIGH vs TEMPERATURE, V+, V- =2.5V, RL = 1k
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open.
4.9980 N = 1000 190 180 4.9975 MAX VOUT (V) 4.9970 MEDIAN 4.9965 MIN 4.9960 VOUT (mV) 170 160 150 140 130 120 MIN 110 4.9955 -40 -20 0 20 40 60 80 100 120 100 -40 -20 0 20 40 60 80 100 120 MAX
(Continued)
N = 1000
MEDIAN
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 42. VOUT HIGH vs TEMPERATURE, V+, V- = 2.5V, RL = 100k
FIGURE 43. VOUT LOW vs TEMPERATURE, V+, V- = 2.5V, RL = 1k
IO+ SHORT CIRCUIT CURRENT (mA)
7.5 7.0 6.5 VOUT (mV) 6.0 5.5
45
N = 1000 MAX
N = 1000 MAX
40
35 MEDIAN 30
MEDIAN 5.0 4.5 4.0 -40 MIN
25 MIN 20 -40
-20
0
20
40
60
80
100
120
-20
0
TEMPERATURE (C)
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 44. VOUT LOW vs TEMPERATURE, V+, V- = 2.5V, RL = 100k
FIGURE 45. IO+ SHORT CIRCUIT OUTPUT CURRENT vs TEMPERATURE VIN = -2.55V, RL = 10k, V+, V- = 2.5V
IO- SHORT CIRCUIT CURRENT (mA)
-20 N = 1000 -22 -24 MEDIAN -26 -28 -30 -32 -40 MIN MAX
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
FIGURE 46. IO- SHORT CIRCUIT OUTPUT CURRENT vs TEMPERATURE VIN = +2.55V, RL = 10k, V+, V- = 2.5V
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Pin Descriptions
ISL28158 (6 Ld SOT-23) ISL28158 (8 Ld SOIC) 1, 5 4 2 2 (A) 6 (B) ISL28258 (8 Ld SOIC) (8 Ld MSOP) PIN NAME NC ININ- (A) IN- (B) FUNCTION Not connected inverting input
V+
EQUIVALENT CIRCUIT
IN-
IN+
VCircuit 1
3
3 3 (A) 5 (B)
IN+ IN+ (A) IN+ (B) V-
Non-inverting input
See Circuit 1
2
4
4
Negative supply
V+
CAPACITIVELY COUPLED ESD CLAMP
VCircuit 2
1
6 1 (A) 7 (B)
OUT OUT (A) OUT (B)
Output
V+ OUT VCircuit 3
6 5
7 8
8
V+ EN
Positive supply Chip enable
LOGIC PIN
See Circuit 2 V+
VCircuit 3
Applications Information
Introduction
The ISL28158 is a single CMOS rail-to-rail input, output (RRIO) operational amplifier with an enable feature. The ISL28258 is a dual version without the enable feature. Both devices are designed to operate from single supply (2.4V to 5.5V) or dual supplies (1.2V to 2.75V).
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.
Rail-to-Rail Input/Output
These devices feature PMOS inputs with an input common mode range that extends up to 0.3V beyond the V+ rail, and to 0.1V below the V- rail. The CMOS output features excellent drive capability, typically swinging to within 6mV of either rail with a 100k load.
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 12 - Circuit 1). For applications where the input differential voltage is expected to exceed 0.5V, an
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FN6377.3 August 29, 2008
ISL28158, ISL28258
external series resistor must be used to ensure the input currents never exceed 5mA (Figure 47). 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.
VOUT + RL
VIN RIN
FIGURE 47. INPUT CURRENT LIMITING
Enable/Disable Feature
The ISL28158 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. By disabling the part, multiple ISL28158 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 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 13 for more details. 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. When not used, the EN pin should either be left floating or connected directly to the -V pin.
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. 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 0.1V/s, or use appropriate current limiting resistors. Large (>2V) differential input voltages can also cause an increase in disabled ICC.
Using Only One Channel
The ISL28258 is a dual op amp. 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 48).
+
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.
FIGURE 48. PREVENTING OSCILLATIONS IN UNUSED CHANNELS
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.
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FN6377.3 August 29, 2008
ISL28158, ISL28258
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)
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)
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
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FN6377.3 August 29, 2008
ISL28158, ISL28258 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
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FN6377.3 August 29, 2008
ISL28158, ISL28258 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
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FN6377.3 August 29, 2008
ISL28158, ISL28258 Mini SO Package Family (MSOP)
0.25 M C A B D N A (N/2)+1
MDP0043
MINI SO PACKAGE FAMILY MILLIMETERS SYMBOL A A1 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. D 2/07 NOTES: 1. Plastic or metal protrusions of 0.15mm maximum per side are not included.
E
E1
PIN #1 I.D.
A2 b c
B
1 (N/2)
D E E1
e C SEATING PLANE 0.10 C N LEADS b
H
e L L1 N
0.08 M C A B
L1 A c SEE DETAIL "X"
2. Plastic interlead protrusions of 0.25mm 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.
A2 GAUGE PLANE L DETAIL X
0.25
A1
3 3
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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 17
FN6377.3 August 29, 2008

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