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ISL28127, ISL28227
Data Sheet May 29, 2009 FN6633.0
Precision Single and Dual Low Noise Operational Amplifiers
The ISL28127 and ISL28227 are very high precision amplifiers featuring very low noise, low offset voltage, low input bias current and low temperature drift making them the ideal choice for applications requiring both high DC accuracy and AC performance. The combination of precision, low noise, and small footprint provides the user with outstanding value and flexibility relative to similar competitive parts. Applications for these amplifiers include precision active filters, medical and analytical instrumentation, precision power supply controls, and industrial controls. The ISL28127 single is available in an 8 Ld SOIC package. The ISL28227 dual amplifier will be offered in 8 Ld SOIC package. All devices are offered in standard pin configurations and operate over the extended temperature range to -40C to +125C.
Features
* Very Low Voltage Noise . . . . . . . . . . . . . . . . . . . .2.5nV/Hz * Low Input Offset . . . . . . . . . . . . . . . . . . . . . . . . 70V, Max. * Superb Offset Drift . . . . . . . . . . . . . . . . . . . 0.5V/C, Max. * Input Bias Current . . . . . . . . . . . . . . . . . . . . . . 10nA, Max. * Wide Supply Range . . . . . . . . . . . . . . . . . . . . .4.5V to 40V * Gain-bandwidth Product. . . . . . . 10MHz Unity Gain Stable * Low Current Consumption . . . . . . . . . . . . . . . . . . . . 2.2mA * Outstanding ESD performance - Human Body Model . . . . . . . . . . . . . . . . . . . . . . . 4.0kV - Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500V - Charged Device Model . . . . . . . . . . . . . . . . . . . . . 1.5kV * Operating Temperature Range . . . . . . . . -40C to +125C * No Phase Reversal * Pb-Free (RoHS Compliant)
Ordering Information
PART NUMBER (Note) ISL28127FBZ* Coming Soon ISL28227FBZ* PART MARKING 28127 FBZ 28227 FBZ PACKAGE (Pb-Free) 8 Ld SOIC 8 Ld SOIC PKG. DWG. # MDP0027 MDP0027
Applications
* Precision Instruments * Medical Instrumentation * Spectral Analysis Equipment * Geophysical Analysis Equipment * Telecom Equipment * Active Filter Blocks * Microphone Pre-amplifier * Thermocouples and RTD Reference Buffers * Data Acquisition * Power Supply Control
*Add "-T13" suffix for tape and reel.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.
Pinouts
ISL28127 (8 LD SOIC) TOP VIEW
NC -IN_A +IN_A V1 2 3 4 -+ 8 7 6 5 NC V+ VOUTA -IN_A 1 2 3 4 -+ +-
ISL28227 (8 LD SOIC) TOP VIEW
8 7 6 5 V+ VOUTB -IN_B +IN_B
VOUTA +IN_A NC V-
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. 2009. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL28127, ISL28227
Absolute Voltage Ratings
Maximum Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42V Maximum Differential Input Current . . . . . . . . . . . . . . . . . . . . 20mA Maximum Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . 0.5V Min/Max Input Voltage . . . . . . . . . . . . . . . . . . V- - 0.5V to V+ + 0.5V Max/Min Input current for input voltage >V+ or Thermal Information
Thermal Resistance (Typical, Note 1) JA (C/W) 8 Ld SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . 120 Storage Temperature Range . . . . . . . . . . . . . . . . . -65C to +150C Pb-free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Ambient Operating Temperature Range . . . . . . . . . -40C to +125C Maximum Operating Junction Temperature . . . . . . . . . . . . . +150C
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
VS 15V, VCM = 0, VO = 0V, RL = Open, TA= +25C, unless otherwise noted. Boldface limits apply over the operating temperature range, -40C to +125C. Temperature data established by characterization. CONDITIONS MIN (Note 2) TYP 10 MAX (Note 2) 70 120 UNIT V V V/C nA nA nA nA V V dB dB 125 dB dB 1500 13.65 V/mV V V 13.5 V V -13.65 -13.5 -13.2 RL = 2k to ground -13.5 -13.4 -13.1 V V V V mA mA
PARAMETER VOS
DESCRIPTION Offset Voltage
VOS/T IOS
Offset Voltage Drift Input Offset Current
0.1 1
0.5 10 12
IB
Input Bias Current
1
10 12
VCM
Input Voltage Range
Guaranteed by CMRR
-13 -12
13 12 120
CMRR
Common-Mode Rejection Ratio
VCM = -13V to +13V VCM = -12V to +12V
115 115 115 115 1000 13.5 13.2
PSRR
Power Supply Rejection Ratio
VS = 2.25V to 20V VS = 3V to 20V
AVOL VOH
Open-Loop Gain Output Voltage High
VO = -13V to +13V RL = 10k to ground RL = 10k to ground
RL = 2k to ground
13.4 13.1
VOL
Output Voltage Low
RL = 10k to ground
IS
Supply Current/Amplifier
2.2
2.8 3.7
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FN6633.0 May 29, 2009
ISL28127, ISL28227
Electrical Specifications
VS 15V, VCM = 0, VO = 0V, RL = Open, TA= +25C, unless otherwise noted. Boldface limits apply over the operating temperature range, -40C to +125C. Temperature data established by characterization. CONDITIONS RL = 0 to ground Guaranteed by PSRR 2.25 MIN (Note 2) TYP 45 20 MAX (Note 2) UNIT mA V
PARAMETER ISC VSUPPLY
DESCRIPTION Short-Circuit Supply Voltage Range
AC SPECIFICATIONS GBW enp-p en en en en in THD + N Gain Bandwidth Product Voltage Noise Voltage Noise Density Voltage Noise Density Voltage Noise Density Voltage Noise Density Current Noise Density Total Harmonic Distortion + Noise 0.1Hz to 10Hz f = 10Hz f = 100Hz f = 1kHz f = 10kHz f = 10kHz 1kHz, G = 1, VO = 3.5VRMS, RL = 2k 10 85 3 2.8 2.5 2.5 0.4 0.00022 MHz nVP-P nV/Hz nV/Hz nV/Hz nV/Hz pA/Hz %
TRANSIENT RESPONSE SR tr, tf, Small Signal Slew Rate Rise Time 10% to 90% of VOUT Fall Time 90% to 10% of VOUT ts Settling Time to 0.1% 10V Step; 10% to VOUT Settling Time to 0.01% 10V Step; 10% to VOUT tOL Output Overload Recovery Time AV = 10, RL = 2k, VO = 4VP-P AV = -1, VOUT = 100mVP-P, Rf = Rg = 2k, RL = 2k to VCM AV = -1, VOUT = 100mVP-P, Rf = Rg = 2k, RL = 2k to VCM AV = -1 VOUT = 10VP-P, Rg = Rf =10k, RL = 2k to VCM AV = -1, VOUT = 10VP-P, RL = 2k to VCM AV = 100, VIN = 0.2V RL = 2k to VCM 3.6 36 38 3.4 3.8 1.7 V/s ns ns s s s
Electrical Specifications
VS 5V, VCM = 0, VO = 0V, TA = +25C, unless otherwise noted. Boldface limits apply over the operating temperature range, -40C to +125C. Temperature data established by characterization. CONDITIONS MIN (Note 2) TYP 10 MAX (Note 2) 70 120 UNIT V V V/C nA nA nA nA V V dB dB 125 dB dB
PARAMETER VOS
DESCRIPTION Offset Voltage
VOS/T IOS
Offset Voltage Drift Input Offset Current
0.1 1
0.5 10 12
IB
Input Bias Current
1
10 12
VCM
Common Mode Input Voltage Range
Guaranteed by CMRR
-3 -2
3 2 120
CMRR
Common-Mode Rejection Ratio
VCM = -3V to +3V VCM = -2V to +2V
115 115 115 115
PSRR
Power Supply Rejection Ratio
VS = 2.25V to 5V VS = 3V to 5V
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FN6633.0 May 29, 2009
ISL28127, ISL28227
Electrical Specifications
VS 5V, VCM = 0, VO = 0V, TA = +25C, unless otherwise noted. Boldface limits apply over the operating temperature range, -40C to +125C. Temperature data established by characterization. (Continued) CONDITIONS VO = -3V to +3V RL = 10k to ground RL = 10k to ground MIN (Note 2) 1000 3.5 3.2 RL = 2k to ground 3.4 3.1 VOL Output Voltage Low RL = 10k to ground -3.65 -3.5 -3.2 RL = 2k to ground -3.5 -3.4 -3.1 IS Supply Current/Amplifier 2.2 2.8 3.7 ISC Short-Circuit 45 V mA mA mA 3.5 V V V TYP 1500 3.65 MAX (Note 2) UNIT V/mV V V
PARAMETER AVOL VOH
DESCRIPTION Open-Loop Gain Output Voltage High
AC SPECIFICATIONS GBW THD + N Gain Bandwidth Product Total Harmonic Distortion + Noise 1kHz, G = 1, Vo = 2.5VRMS, RL = 2k 10 0.0034 MHz %
TRANSIENT RESPONSE SR tr, tf, Small Signal Slew Rate Rise Time 10% to 90% of VOUT Fall Time 90% to 10% of VOUT ts Settling Time to 0.1% Settling Time to 0.01% 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. AV = 10, RL = 2kOH AV = -1, VOUT = 100mVP-P, Rf = Rg = 2k, RL = 2k to VCM AV = -1, VOUT = 100mVP-P, Rf = Rg = 2k, RL = 2k to VCM AV = -1, VOUT = 4VP-P, Rf = Rg = 2k, RL = 2k to VCM AV = -1, VOUT = 4VP-P, Rf = Rg = 2k, RL = 2k to VCM 3.6 36 38 1.6 4.2 V/s ns ns s s
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FN6633.0 May 29, 2009
ISL28127, ISL28227 Typical Performance Curves VS = 15V, VCM = 0V, RL = Open, unless otherwise specified.
100 INPUT NOISE VOLTAGE (nV) 80 60 40 20 0 -20 -40 -60 -80 -100 0 1 2 3 4 5 TIME (s) 6 V+ = 38V RL = 10k CL = 3.5pF Rg = 10, Rf = 100k AV = 10,000 7 8 9 10 PSRR (dB ) 130 120 PSRR+ and PSRR- VS = 5V 110 100 90 RL = INF 80 CL = 5.25pF 70 AV = +1 60 VS = 1VP-P 50 40 PSRR+ and PSRR- VS = 15V 30 20 10 0 -10 10M 10 100 1k 10k 100k 1M FREQUENCY (Hz)
FIGURE 1. INPUT NOISE VOLTAGE 0.1Hz to 10Hz
FIGURE 2. PSRR vs FREQUENCY, VS = 5V, 15V
130 120 110 100 90 80 70 60 50 40 30 20 10 0 -10 10
VS = 5V VS = 2.25V
25 20 15 10 VS = 21V VOS (V) MEDIAN
CMRR (dB)
VS = 15V
5 0 -5 -10 -15 VS = 3V 36 UNITS -20 0 20 40 60 80 100 120 140 160 VS = 5V VS = 15V
RL = INF CL = 5.25pF AV = +1 VCM = 1VP-P 100 1k 10k 100k 1M 10M
-20 -40
FREQUENCY (Hz)
TEMPERATURE (C)
FIGURE 3. CMRR vs FREQUENCY, VS = 2.25, 5V, 15V
FIGURE 4. VOS vs TEMPERATURE vs VSUPPLY
4.5 50 UNITS 4.0 3.5 IBIAS (nA) 3.0 2.5 2.0 1.5 1.0 0.5 -40 -20 0 20 40 60 80 100 120 IBIAS+ MEDIAN IBIASIBIAS (nA)
3.0 2.5 2.0 IBIAS+ 1.5 1.0 IBIAS0.5 0 -40 50 UNITS MEDIAN
-20
0
TEMPERATURE (C)
20 40 60 80 TEMPERATURE (C)
100
120
FIGURE 5. IIB vs TEMPERATURE, VS = 15V
FIGURE 6. IIB vs TEMPERATURE, VS = 5V
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FN6633.0 May 29, 2009
ISL28127, ISL28227 Typical Performance Curves VS = 15V, VCM = 0V, RL = Open, unless otherwise specified.
0.5 0.0 -0.5 IOS (nA) -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -40 -20 0 20 40 60 80 100 120 -40 -60 -40C MEDIAN vs = 15 50 UNITS VOS (V) vs = 5 60 29 UNITS 40 20 0 -20 AVERAGE
(Continued)
+25C +125C
-15
-10
-5
0
5
10
15
TEMPERATURE (C)
INPUT COMMON MODE VOLTAGE
FIGURE 7. IOS vs TEMPERATURE vs SUPPLY
FIGURE 8. INPUT OFFSET VOLTAGE vs INPUT COMMON MODE VOLTAGE, VS = 15V
14.2 14.1 14.0 13.9 VOUT (V) RL = 100k VOUT (V) 13.8 13.7 13.6 13.5 13.4 13.3 13.2 -40 -20 0 20 40 60 80 100 120 RL = 2k 50 UNITS MEDIAN
-13.1 -13.2 -13.3 -13.4 -13.5 -13.6 -13.7 -13.8 -13.9 -14.0 -14.1 -14.2 -40 -20 0 20 40 60 80 100 120 RL = 100k RL = 2k 50 UNITS MEDIAN
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 9. VOH vs TEMPERATURE, VS = 15V
FIGURE 10. VOL vs TEMPERATURE, VS = 15V
200 180 160 140 120 100 80 60 40 20 0 -20 R = 10k L -40 CL = 10pF -60 SIMULATION -80 -100 0.1m 1m 10m100m 1
PHASE
GAIN
10 100 1k 10k 100k 1M 10M100M FREQUENCY (Hz)
200 180 160 140 120 100 80 60 40 20 0 -20 R = 10k L -40 CL = 100pF -60 SIMULATION -80 -100 0.1m 1m 10m100m 1
OPEN LOOP GAIN (dB)/PHASE ()
OPEN LOOP GAIN (dB)/PHASE ()
PHASE
GAIN
10 100 1k 10k 100k 1M 10M100M FREQUENCY (Hz)
FIGURE 11. OPEN-LOOP GAIN, PHASE vs FREQUENCY, RL = 10k, CL = 10pF
FIGURE 12. OPEN-LOOP GAIN, PHASE vs FREQUENCY, RL = 10k, CL = 100pF
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FN6633.0 May 29, 2009
ISL28127, ISL28227 Typical Performance Curves VS = 15V, VCM = 0V, RL = Open, unless otherwise specified.
70 NORMALIZED GAIN (dB) 60 50 GAIN (dB) 40 30 20 10 0 AV = 10 Rg = 10k, Rf = 100k AV = 1 Rg = OPEN, Rf = 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M AV = 100 AV = 1000 Rg = 100, Rf = 100k Rg = 1k, Rf = 100k VS = 15V CL = 3.5pF RL = INF VOUT = 100mVP-P 15 13 11 9 7 5 3 VS = 15V RL = 10k 1 CL = 3.5pF -1 A = +2 V -3 VOUT = 100mVP-P -5 1k 10k Rf = Rg = 100 Rf = Rg = 1k
(Continued)
Rf = Rg = 100k Rf = Rg = 10k
-10 100
100k
1M
10M
100M
FREQUENCY (Hz)
FIGURE 13. FREQUENCY RESPONSE vs CLOSED LOOP GAIN
FIGURE 14. FREQUENCY RESPONSE vs FEEDBACK RESISTANCE Rf/Rg
2 RL = 10k NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 1 0 -1 -2 VS = 15V -3 -4 -5 1k CL = 3.5pF AV = +1 VOUT = 100mVP-P 10k RL = 49.9 RL = 499 RL = 100 RL = 1k
7 6 5 4 3 2 1 0 -1 -2 100k 1M FREQUENCY (Hz) 10M 100M -3 1k 10k CL = 3.5pF 100k 1M FREQUENCY (Hz) 10M 100M VS = 15V RL = 10k AV = +1 VOUT = 100mVP-P
CL = 1000pF CL = 220pF CL = 100pF CL = 25.5pF
FIGURE 15. GAIN vs FREQUENCY vs RL
FIGURE 16. GAIN vs FREQUENCY vs CL
1
INPUT NOISE VOLTAGE (nV/Hz)
VS = 2.25V
100 VS = 19V AV = 1
NORMALIZED GAIN (dB)
0
-1 CL = 3.5pF RL = 10k AV = +1 VOUT = 100mVP-P 1k 10k
VS = 5V VS = 15V
10
-2
-3
100k
1M
10M
100M
1 0.1
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 17. GAIN vs FREQUENCY vs SUPPLY VOLTAGE
FIGURE 18. INPUT NOISE VOLTAGE SPECTRAL DENSITY
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FN6633.0 May 29, 2009
ISL28127, ISL28227 Typical Performance Curves VS = 15V, VCM = 0V, RL = Open, unless otherwise specified.
100 INPUT NOISE CURRENT (pA/Hz) VS = 19V AV = 1 10 LARGE SIGNAL (V) 6 5 4 3 2 1 0 1 -2 -3 -4 -5 0.1 0.1 1 10 100 1k 10k 100k -6 0 5 10 15 TIME (s) 20 25 30 RL = 2k RL = 10k VS = 15V CL = 3.5pF AV = 1 Rf = 10k, Rg = 1k VOUT = 10VP-P
(Continued)
1
FREQUENCY (Hz)
FIGURE 19. INPUT NOISE CURRENT SPECTRAL DENSITY
FIGURE 20. LARGE SIGNAL 10V STEP RESPONSE, VS = 15V
2.4 2.0 1.6 LARGE SIGNAL (V) 1.2 0.8 0.4 0 -0.4 -0.8 -1.2 -1.6 -2.0 -2.4 VS = 5V, RL = 2k, 10k CL = 3.5pF AV = 1 VOUT = 4VP-P 0 5 10 15 20 25 TIME (s) 30 35 40 VS = 15V, RL = 2k, 10k SMALL SIGNAL (mV)
80 60 40 20 0 20 40 60 80 0 0.2 0.4 0.6 RL = 2k CL = 3.5pF AV = 1 VOUT = 100mVP-P 0.8 1.0 1.2 1.4 1.6 1.8 2.0 VS = 5V, 15V
TIME (ms)
FIGURE 21. LARGE SIGNAL TRANSIENT RESPONSE vs RL VS = 5V, 15V
FIGURE 22. SMALL SIGNAL TRANSIENT RESPONSE, VS = 5V, 15V
0.06 0.02 -0.02 INPUT (V) -0.06 -0.10 -0.14 -0.18 -0.20 -0.26 0 5 10 15 OUTPUT 20 25 TIME (s) 30 35 VS = 15V RL = 10k CL = 3.5pF AV = 100 Rf = 100k, Rg = 1k VIN = 200mVP-P INPUT
15 13 11 OUTPUT (V) INPUT (V) 9 7 5 3 1 -1 40
0.26 0.22 0.08 0.04 0.10 0.06 0.02 -0.02 -0.06 0 5 10 15 20 25 TIME (s) 30 35 OUTPUT VS = 15V RL = 10k CL = 3.5pF AV = 100 Rf = 100k, Rg = 1k VIN = 200mVP-P INPUT
2 0 -2 -4 -6 -8 -10 -12 -14 40 OUTPUT (V)
FIGURE 23. POSITIVE OUTPUT OVERLOAD RESPONSE TIME, VS = 15V
FIGURE 24. NEGATIVE OUTPUT OVERLOAD RESPONSE TIME, VS = 15V
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FN6633.0 May 29, 2009
ISL28127, ISL28227 Typical Performance Curves VS = 15V, VCM = 0V, RL = Open, unless otherwise specified.
90 80 70 OVERSHOOT (%) 60 50 40 30 20 10 0 10 100 1000 CAPACITANCE (pF) 10000
O O
(Continued)
VS = 15V RL = 10k AV = 1 VOUT = 100mVP-P
H RS VE OO
T+
HO RS VE
OT
-
FIGURE 25. % OVERSHOOT vs LOAD CAPACITANCE, VS = 15V
Pin Descriptions
ISL28127 (8 LD SOIC) 3 4 ISL28227 (8 LD SOIC) 3 4 5 6 7 7 6 2 1, 5, 8
V+ IN-
PIN NAME +IN_A V+IN_B -IN_B VOUTB V+ VOUTA -IN_A NC
EQUIVALENT CIRCUIT Circuit 1 Circuit 3 Circuit 1 Circuit 1 Circuit 2 Circuit 3 Circuit 2 Circuit 1 -
DESCRIPTION Amplifier A non-inverting input Negative power supply Amplifier B non-inverting input Amplifier B inverting input Amplifier B output Positive power supply Amplifier A output Amplifier A inverting input No internal connection
8 1 2
V+ IN+ OUT V-
V+ CAPACITIVELY TRIGGERED ESD CLAMP V-
V-
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
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FN6633.0 May 29, 2009
ISL28127, ISL28227 Applications Information
Functional Description
The ISL28127 and ISL28227 are single and dual, low noise 10MHz BW precision op amps. Both devices are fabricated in a new precision 40V complementary bipolar DI process. A super-beta NPN input stage with input bias current cancellation provides low input bias current (1nA typical), low input offset voltage (10V typ), low input noise voltage (3nV/Hz), and low 1/f noise corner frequency (3Hz). These amplifiers also feature high open loop gain (1400V/mV) for excellent CMRR (120dB) and THD+N performance (0.0002% @ 3.5VRMS, 1kHz into 2k). A complimentary bipolar output stage enables high capacitive load drive without external compensation. input is at 10V, The input differential voltage of 6.4V will force input ESD diodes to conduct, dumping the input current directly into the output stage and the load. The resulting current flow can cause permanent damage to the ESD diodes. The ESD diodes are rated to 20mA, and in the previous example, setting RIN to 1k resistor (Figure 26) would limit the current to < 6.4mA, and provide additional protection up to 20V at the input. In applications where one or both amplifier input terminals are at risk of exposure to high voltage, current limiting resistors may be needed at each input terminal (see Figure 27 RIN+, RIN-) to limit current through the power supply ESD diodes to 20mA.
Operating Voltage Range
The devices are designed to operate over the 4.5V (2.25V) to 40V (20V) range and are fully characterized at 10V (5V) and 30V (15V). Parameter variation with operating voltage is shown in the "Typical Performance Curves" beginning on page 5. The input common mode voltage sensitivity to temperature is shown in Figure 19 (15V). Figure 20 shows VOS as a function of supply voltage and temperature with the common mode voltage at 0V for split supply operation.
VINVIN+ RINRIN+ +
V+
VOUT RL
V-
Input ESD Diode Protection
The input terminals (IN+ and IN-) have internal ESD protection diodes to the positive and negative supply rails, and an additional anti-parallel diode pair across the inputs (Figures 26 and 27).
FIGURE 27. INPUT ESD DIODE CURRENT LIMITING DIFFERENTIAL INPUT
Output Current Limiting
The output current is internally limited to approximately 45mA at +25C and can withstand an short circuit to either rail as long as the power dissipation limits are not exceeded. This applies to only 1 amplifier at a time for the dual op amp. Continuous operation under these conditions may degrade long term reliability.
V+
RIN +
VOUT RL
Output Phase Reversal
Output phase reversal is a change of polarity in the amplifier transfer function when the input voltage exceeds the supply voltage. The ISL28127 and ISL28227 are immune to output phase reversal, even when the input voltage is 1V beyond the supplies.
VIN
V-
FIGURE 26. INPUT ESD DIODE CURRENT LIMITING - UNITY GAIN
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 using Equation 1:
T JMAX = T MAX + JA xPD MAXTOTAL (EQ. 1)
For unity gain applications (Figure 26) where the output is connected directly to the non-inverting input a current limiting resistor (RIN) will be needed under the following conditions to protect the anti-parallel differential input protection diodes. * The amplifier input is supplied from a low impedance source. * The input voltage rate-of-rise (dV/dt) exceeds the maximum slew rate of the amplifier (3.6V/s). If the output lags far enough behind the input, the anti-parallel input diodes can conduct. For example, if an input pulse ramps from 0V to +10V in 1s, then the output of the ISL28x27 will reach only +3.6V (slew rate = 3.6V/s) while the
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FN6633.0 May 29, 2009
ISL28127, ISL28227
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 = V S x I qMAX + ( V S - V OUTMAX ) x --------------------------R
L
where: * TMAX = Maximum ambient temperature * JA = Thermal resistance of the package * PDMAX = Maximum power dissipation of 1 amplifier * VS = Total supply voltage
(EQ. 2)
* IqMAX = Maximum quiescent supply current of 1 amplifier * VOUTMAX = Maximum output voltage swing of the application RL = Load resistance
Revision History
DATE 5/28/09 REVISION FN6633.0 CHANGE Techdocs Issued File Number FN6633. Initial release of Datasheet with file number FN6633 making this a Rev 0.
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 11
FN6633.0 May 29, 2009
ISL28127, ISL28227 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
12
FN6633.0 May 29, 2009

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