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FEATURES
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LT1498/LT1499 10MHz, 6V/s, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps DESCRIPTION
The LT(R)1498/LT1499 are dual/quad, rail-to-rail input and output precision C-LoadTM op amps with a 10MHz gainbandwidth product and a 6V/s slew rate. The LT1498/LT1499 are designed to maximize input dynamic range by delivering precision performance over the full supply voltage. Using a patented technique, both input stages of the LT1498/LT1499 are trimmed, one at the negative supply and the other at the positive supply. The resulting guaranteed common mode rejection is much better than other rail-to-rail input op amps. When used as a unity-gain buffer in front of single supply 12-bit A-to-D converters, the LT1498/LT1499 are guaranteed to add less than 1LSB of error even in single 3V supply systems. With 110dB of supply rejection, the LT1498/LT1499 maintain their performance over a supply range of 2.2V to 36V and are specified for 3V, 5V and 15V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output. These op amps remain stable while driving capacitive loads up to 10,000pF . The LT1498 is available with the standard dual op amp configuration in 8-pin PDIP and SO packaging. The LT1499 features the standard quad op amp configuration and is available in a 14-pin plastic SO package. These devices can be used as plug-in replacements for many standard op amps to improve input/output range and precision.
Rail-to-Rail Input and Output 475V Max VOS from V+ to V- Gain-Bandwidth Product: 10MHz Slew Rate: 6V/s Low Supply Current per Amplifier: 1.7mA Input Offset Current: 65nA Max Input Bias Current: 650nA Max Open-Loop Gain: 1000V/mV Min Low Input Noise Voltage: 12nV/Hz Typ Wide Supply Range: 2.2V to 15V Large Output Drive Current: 30mA Stable for Capacitive Loads Up to 10,000pF Dual in 8-Pin PDIP and SO Package Quad in Narrow 14-Pin SO
APPLICATIONS
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Driving A-to-D Converters Active Filters Rail-to-Rail Buffer Amplifiers Low Voltage Signal Processing Battery-Powered Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
10 0
Frequency Response
VIN = 2.7VP-P V+ = 3V
Single Supply 100kHz 4th Order Butterworth Filter
GAIN (dB) VOUT
1498 TA01
-10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 100 1k 100k 10k FREQUENCY (Hz)
6.81k 6.81k VIN 330pF 11.3k
100pF 5.23k 47pF V+
1/2 LT1498
1000pF
V+/2
+
-
1/2 LT1498
+
-
5.23k
10.2k
1M
10M
1498 TA02
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LT1498/LT1499 ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V-) .................................36V Input Current........................................................ 10mA Output Short-Circuit Duration (Note 2) ......... Continuous Operating Temperature Range LT1498/LT1499 ....................................-40C to 85C LT1498MP ......................................... -55C to 125C
Specified Temperature Range (Note 4) LT1498/LT1499 ....................................-40C to 85C LT1498MP ......................................... -55C to 125C Junction Temperature ........................................... 150C Storage Temperature Range .................. -65C to 150C Lead Temperature (Soldering, 10 sec)................... 300C
PIN CONFIGURATION
TOP VIEW TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4
A B
TOP VIEW 8 7 6 5 V+ OUT B -IN B +IN B OUT A 1 -IN A 2 +IN A 3 V- 4
A B
OUTA 1 8 7 6 5 V+ OUT B -IN B +IN B -IN A 2 +IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7
B C A D
14 OUT D 13 -IN D 12 +IN D 11 V- 10 +IN C 8 8 -IN C OUT C
N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 150C, JA = 130C/W
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 130C/W
S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150C, JA = 150C/W
ORDER INFORMATION
LEAD FREE FINISH LT1498CN8#PBF LT1498CS8#PBF LT1498IN8#PBF LT1498IS8#PBF LT1498MPS8#PBF LT1499CS#PBF LT1499IS#PBF LEAD BASED FINISH LT1498CN8 LT1498CS8 LT1498IN8 LT1498IS8 LT1498MPS8 LT1499CS LT1499IS TAPE AND REEL LT1498CN8#TRPBF LT1498CS8#TRPBF LT1498IN8#TRPBF LT1498IS8#TRPBF LT1498MPS8#TRPBF LT1499CS#TRPBF LT1499IS#TRPBF TAPE AND REEL LT1498CN8#TR LT1498CS8#TR LT1498IN8#TR LT1498IS8#TR LT1498MPS8#TR LT1499CS#TR LT1499IS#TR PART MARKING* 1498 1498 1498I 1498I 1498MP 1498 1498I PART MARKING* 1498 1498 1498I 1498I 1498MP 1498 1498I PACKAGE DESCRIPTION 8-Lead Plastic PDIP 8-Lead Plastic SO 8-Lead Plastic PDIP 8-Lead Plastic SO 8-Lead Plastic SO 14-Lead Plastic SO 14-Lead Plastic SO PACKAGE DESCRIPTION 8-Lead Plastic PDIP 8-Lead Plastic SO 8-Lead Plastic PDIP 8-Lead Plastic SO 8-Lead Plastic SO 14-Lead Plastic SO 14-Lead Plastic SO TEMPERATURE RANGE 0C to 70C 0C to 70C -40C to 85C -40C to 85C -55C to 125C 0C to 70C -40C to 85C TEMPERATURE RANGE 0C to 70C 0C to 70C -40C to 85C -40C to 85C -55C to 125C 0C to 70C -40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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LT1498/LT1499 ELECTRICAL CHARACTERISTICS
otherwise noted.
SYMBOL VOS VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS en in CIN AVOL CMRR Input Offset Current Input Offset Current Shift Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Capacitance Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) PSRR VOL Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6) VS = 5V, VO = 75mV to 4.8V, RL = 10k VS = 3V, VO = 75mV to 2.8V, RL = 10k VS = 5V, VCM = V- to V+ VS = 3V, VCM = V- to V+ VS = 5V, VCM = V- to V+ VS = 3V, VCM = V- to V+ VS = 2.2V to 12V, VCM = VO = 0.5V VS = 2.2V to 12V, VCM = VO = 0.5V No Load ISINK = 0.5mA ISINK = 2.5mA No Load ISOURCE = 0.5mA ISOURCE = 2.5mA VS = 5V VS = 3V 12.5 12.0 6.8 VS = 5V, AV = -1, RL = Open, VO = 4V VS = 3V, AV = -1, RL = Open 2.6 2.3 600 500 81 76 75 70 88 82
TA = 25C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless
CONDITIONS VCM = V+ VCM = V- VCM = V- to V+ VCM = V+, V- (Note 5) VCM = V+ VCM = V- VCM = V- to V+ VCM = V+ (Note 5) VCM = V- (Note 5) VCM = V+ VCM = V- VCM = V- to V+ 0.1Hz to 10Hz f = 1kHz f = 1kHz MIN TYP 150 150 150 200 0 -650 0 -100 250 -250 500 10 -10 5 5 10 400 12 0.3 5 3800 2000 90 86 91 86 105 103 14 35 90 2.5 50 140 24 19 1.7 10.5 4.5 4.0 2.2 30 70 200 10 100 250 MAX 475 475 425 750 650 0 1300 100 0 65 65 130 UNITS V V V V nA nA nA nA nA nA nA nA nVP-P nV/Hz pA/Hz pF V/mV V/mV dB dB dB dB dB dB mV mV mV mV mV mV mA mA mA MHz V/s V/s
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate (Note 8)
The l denotes the specifications which apply over the temperature range 0C < TA < 70C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL VOS VOS TC VOS PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Voltage Shift CONDITIONS VCM = V+ VCM = V- + 0.1V VCM = V+ VCM = V- + 0.1V to V+ = V- + 0.1V, V+ (Note 5)
l l l l l l
MIN
TYP 175 175 0.5 1.5 170 200
MAX 650 650 2.5 4.0 600 900
UNITS V V V/C V/C V V
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Input Offset Voltage Match (Channel-to-Channel) VCM
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LT1498/LT1499 ELECTRICAL CHARACTERISTICS
SYMBOL IB IB PARAMETER Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS AVOL CMRR Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) PSRR VOL Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6)
The l denotes the specifications which apply over the temperature range 0C < TA < 70C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
CONDITIONS VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VCM = V+ (Note 5) VCM = V- + 0.1V (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VS = 5V, VO = 75mV to 4.8V, RL = 10k VS = 3V, VO = 75mV to 2.8V, RL = 10k VS = 5V, VCM = V- + 0.1V to V+ VS = 3V, VCM = V- + 0.1V to V+ VS = 5V, VCM = V- + 0.1V to V+ VS = 3V, VCM = V- + 0.1V to V+ VS = 2.3V to 12V, VCM = VO = 0.5V VS = 2.3V to 12V, VCM = VO = 0.5V No Load ISINK = 0.5mA ISINK = 2.5mA No Load ISOURCE = 0.5mA ISOURCE = 2.5mA VS = 5V VS = 3V
l l l l l l l l l l l l l l l l l l l l l l l l l l
MIN 0 -780 0 -170
TYP 275 -275 550 15 -15 10 10 20
MAX 780 0 1560 170 0 85 85 170
UNITS nA nA nA nA nA nA nA nA V/mV V/mV dB dB dB dB dB dB
500 400 78 73 74 69 86 80
2500 2000 89 85 90 86 102 102 17 40 110 3.5 55 160 35 80 220 15 120 300
mV mV mV mV mV mV mA mA
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate (Note 8)
12 10 6.1 2.5 2.2
23 20 1.9 9 4.0 3.5 2.6
mA MHz V/s V/s
VS = 5V, AV = -1, RL = Open, VO = 4V VS = 3V, AV = -1, RL = Open
l l
The l denotes the specifications which apply over the temperature range -40C < TA < 85C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL VOS VOS TC VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Voltage Shift Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS Input Offset Current Input Offset Current Shift CONDITIONS VCM = V+ VCM = V- + 0.1V VCM = V+ VCM = V- + 0.1V to V+ = V- + 0.1V, V+ (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VCM = V+ (Note 5) VCM = V- + 0.1V (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+
l l l l l l l l l l l l l l
MIN
TYP 250 250 0.5 1.5 250 300
MAX 750 750 2.5 4.0 650 1500 975 0 1950 180 0 110 110 220
UNITS V V V/C V/C V V nA nA nA nA nA nA nA nA
Input Offset Voltage Match (Channel-to-Channel) VCM
0 -975 0 -180
350 -350 700 30 -30 15 15 30
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LT1498/LT1499 ELECTRICAL CHARACTERISTICS
SYMBOL AVOL CMRR PARAMETER Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) PSRR VOL Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6)
The l denotes the specifications which apply over the temperature range -40C < TA < 85C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
CONDITIONS VS = 5V, VO = 75mV to 4.8V, RL = 10k VS = 3V, VO = 75mV to 2.8V, RL = 10k VS = 5V, VCM = V- + 0.1V to V+ VS = 3V, VCM = V- + 0.1V to V+ VS = 5V, VCM = V- + 0.1V to V+ VS = 3V, VCM = V- + 0.1V to V+ VS = 2.5V to 12V, VCM = VO = 0.5V VS = 2.5V to 12V, VCM = VO = 0.5V No Load ISINK = 0.5mA ISINK = 2.5mA No Load ISOURCE = 0.5mA ISOURCE = 2.5mA VS = 5V VS = 3V
l l l l l l l l l l l l l l l l l l
MIN 400 300 77 73 72 69 86 80
TYP 2500 2000 86 81 86 83 100 100 18 45 110 3.5 60 170
MAX
UNITS V/mV V/mV dB dB dB dB dB dB
40 80 220 15 120 300
mV mV mV mV mV mV mA mA
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate (Note 8)
7.5 7.5 5.8 2.2 1.9
15 15 2.0 8.5 3.6 3.2 2.7
mA MHz V/s V/s
VS = 5V, AV = -1, RL = Open, VO = 4V VS = 3V, AV = -1, RL = Open
l l
The l denotes the specifications which apply over the temperature range -55C < TA < 125C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL VOS VOS TC VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Voltage Shift Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS AVOL CMRR Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) PSRR Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) CONDITIONS VCM = V+ - 0.5V VCM = V- + 0.5V VCM = V+ - 0.5V VCM = V- + 0.5V to V+ - 0.5V = V- + 0.5V, V+ - 0.5V (Note 5) VCM = V+ - 0.5V VCM = V- + 0.5V VCM = V- + 0.5V to V+ - 0.5V VCM = V+ - 0.5V (Note 5) VCM = V- + 0.5V (Note 5) VCM = V+ - 0.5V VCM = V- + 0.5V VCM = V- + 0.5V to V+ - 0.5V VS = 5V, VO = 0.5mV to 4.5V, RL = 10k VS = 3V, VO = 0.5mV to 2.5V, RL = 10k VS = 5V, VCM = V- + 0.5V to V+ - 0.5V VS = 3V, VCM = V- + 0.5V to V+ - 0.5V VS = 5V, VCM = V- + 0.5V to V+ - 0.5V VS = 3V, VCM = V- + 0.5V to V+ - 0.5V VS = 2.5V to 12V, VCM = VO = 0.5V VS = 2.5V to 12V, VCM = VO = 0.5V
l l l l l l l l l l l l l l l l l l l l l l
MIN
TYP 300 300 0.5 1.5 250 300
MAX 1100 1100
UNITS V V V/C V/C
2300 1900 1100 0 2200 400 0 300 300 600
V V nA nA nA nA nA nA nA nA V/mV V/mV dB dB dB dB dB dB
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Input Offset Voltage Match (Channel-to-Channel) VCM
0 -1100 0 -400
450 -450 900 40 -40 40 40 80
40 20 66 62 62 58 86 80
210 210 80 75 80 75 100 100
5
LT1498/LT1499 ELECTRICAL CHARACTERISTICS
SYMBOL VOL PARAMETER Output Voltage Swing (Low) (Note 6)
The l denotes the specifications which apply over the temperature range -55C < TA < 125C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
CONDITIONS No Load ISINK = 0.5mA ISINK = 2.5mA No Load ISOURCE = 0.5mA ISOURCE = 2.5mA VS = 5V VS = 3V
l l l l l l l l l l
MIN
TYP 22 45 110 3.5 60 170
MAX 50 80 220 20 120 350
UNITS mV mV mV mV mV mV mA mA
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate (Note 8)
5 5 5.8 2.0 1.7
15 15 2.4 8.5 3.6 3.2 3.0
mA MHz V/s V/s
VS = 5V, AV = -1, RL = Open, VO = 4V VS = 3V, AV = -1, RL = Open
l l
TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL VOS VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS en in AVOL Input Offset Current Input Offset Current Shift Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Large-Signal Voltage Gain Channel Separation CMRR PSRR VOL Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6) CONDITIONS VCM = V+ VCM = V- VCM = V- to V+ VCM = V+, V- (Note 5) 0 -715 0 -120 VCM = V+ VCM = V- VCM = V- to V+ VCM = V+ (Note 5) VCM = V- (Note 5) VCM = V+ VCM = V- VCM = V- to V+ 0.1Hz to 10Hz f = 1kHz f = 1kHz VO = -14.5V to 14.5V, RL = 10k VO = -10V to 10V, RL = 2k VO = -10V to 10V, RL = 2k VCM = V- to V+ VCM = V- to V+ VS = 5V to 15V VS = 5V to 15V No Load ISINK = 0.5mA ISINK = 10mA No Load ISOURCE = 0.5mA ISOURCE = 10mA 1000 500 116 93 87 89 83 MIN TYP 200 200 150 250 250 -250 500 12 -12 6 6 12 400 12 0.3 5200 2300 130 106 103 110 105 18 40 230 2.5 55 420 30 80 500 10 120 800 MAX 800 800 650 1400 715 0 1430 120 0 70 70 140 UNITS V V V V nA nA nA nA nA nA nA nA nVP-P nV/Hz pA/Hz V/mV V/mV dB dB dB dB dB mV mV mV mV mV mV
VOH
Output Voltage Swing (High) (Note 6)
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LT1498/LT1499 ELECTRICAL CHARACTERISTICS
ISC IS GBW SR Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate AV = -1, RL = Open, VO = 10V Measure at VO = 5V 6.8 3.5
TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
15 30 1.8 10.5 6 2.5 mA mA MHz V/s
The l denotes the specifications which apply over the temperature range 0C < TA < 70C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL VOS VOS TC VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Voltage Shift Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS AVOL Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain Channel Separation CMRR PSRR VOL Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6) CONDITIONS VCM = V+ VCM = V- + 0.1V VCM = V+ VCM = V- + 0.1V to V+ = V- + 0.1V, V+ (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VCM = V+ (Note 5) VCM = V- + 0.1V (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VO = -14.5V to 14.5V, RL = 10k VO = -10V to 10V, RL = 2k VO = -10V to 10V, RL = 2k VCM = V- + 0.1V to V+ VCM = V- + 0.1V to V+ VS = 5V to 15V VS = 5V to 15V No Load ISINK = 0.5mA ISINK = 10mA No Load ISOURCE = 0.5mA ISOURCE = 10mA
l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l
MIN
TYP 200 200 1.0 2.0 200 350
MAX 900 900 3.5 5.0 750 1500 875 0 1750 180 0 90 90 180
UNITS V V V/C V/C V V nA nA nA nA nA nA nA nA V/mV V/mV dB dB dB dB dB
Input Offset Voltage Match (Channel-to-Channel) VCM
0 -875 0 -180
300 -300 600 20 -20 15 15 30
900 400 112 92 86 88 82
5000 2000 125 103 103 103 103 18 45 270 3.5 60 480 40 90 520 15 120 1000 2.8
mV mV mV mV mV mV mA mA MHz V/s
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate AV = -1, RL = Open, VO = 10V Measured at VO = 5V
12 6.1 3.4
28 1.9 9 5.3
l
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LT1498/LT1499 ELECTRICAL CHARACTERISTICS
SYMBOL VOS VOS TC VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Voltage Shift Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS AVOL Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain Channel Separation CMRR PSRR VOL Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6)
The l denotes the specifications which apply over the temperature range -40C < TA < 85C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
CONDITIONS VCM = V+ VCM = V- + 0.1V VCM = V+ VCM = V- + 0.1V to V+ = V- + 0.1V, V+ (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VCM = V+ (Note 5) VCM = V- + 0.1V (Note 5) VCM = V+ VCM = V- + 0.1V VCM = V- + 0.1V to V+ VO = -14.5V to 14.5V, RL = 10k VO = -10V to 10V, RL = 2k VO = -10V to 10V, RL = 2k VCM = V- + 0.1V to V+ VCM = V- + 0.1V to V+ VS = 5V to 15V VS = 5V to 15V No Load ISINK = 0.5mA ISINK = 10mA No Load ISOURCE = 0.5mA ISOURCE = 10mA
l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l
MIN
TYP 300 300 1.0 2.0 250 350
MAX 950 950 3.5 5.0 850 1800 1050 0 2100 200 0 115 115 230
UNITS V V V/C V/C V V nA nA nA nA nA nA nA nA V/mV V/mV dB dB dB dB dB
Input Offset Voltage Match (Channel-to-Channel) VCM
0 -1050 0 -200
350 -350 700 20 -20 15 15 30
800 350 110 90 86 88 82
5000 2000 120 101 100 100 100 25 50 275 3.5 65 500 50 100 520 15 120 1000 3.0
mV mV mV mV mV mV mA mA MHz V/s
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate AV = -1, RL = Open, VO = 10V Measure at VO = 5V
10 5.8 3
18 2.0 8.5 4.75
l
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LT1498/LT1499 ELECTRICAL CHARACTERISTICS
SYMBOL VOS VOS TC VOS IB IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Voltage Shift Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) IOS IOS AVOL CMRR PSRR VOL Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain Channel Separation Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 5) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 5) Output Voltage Swing (Low) (Note 6)
The l denotes the specifications which apply over the temperature range -55C < TA < 125C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
CONDITIONS VCM = V+ - 0.5V VCM = V- + 0.5V VCM = V+ - 0.5V VCM = V- + 0.5V to V+ - 0.5V = V- + 0.5V, V+ - 0.5V (Note 5) VCM = V+ - 0.5V VCM = V- + 0.5V VCM = V- + 0.5V to V+ - 0.5V VCM = V+ - 0.5V (Note 5) VCM = V- + 0.5V (Note 5) VCM = V+ - 0.5V VCM = V- + 0.5V VCM = V- + 0.5V to V+ - 0.5V VO = -14.5V to 14.5V, RL = 10k VO = -10V to 10V, RL = 2k VCM = V- + 0.5V to V+ - 0.5V VCM = V- + 0.5V to V+ - 0.5V VS = 5V to 15V VS = 5V to 15V No Load ISINK = 0.5mA ISINK = 10mA No Load ISOURCE = 0.5mA ISOURCE = 10mA
l l l l l l l l l l l l l l l l l l l l l l l l l l l l l
MIN
TYP 350 350 1.0 2.0 250 400
MAX 1300 1300
UNITS V V V/C V/C
1500 2200 1200 0 2400 400 0 300 300 600
V V nA nA nA nA nA nA nA nA V/mV dB dB dB dB dB
Input Offset Voltage Match (Channel-to-Channel) VCM
0 -1200 0 -400
500 -500 1000 40 -40 40 40 80
40 110 86 80 88 80
400 120 100 100 100 100 25 50 275 3.5 65 500 75 100 520 20 120 1400 3.2
mV mV mV mV mV mV mA mA MHz V/s
VOH
Output Voltage Swing (High) (Note 6)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain-Bandwidth Product (Note 7) Slew Rate AV = -1, RL = Open, VO = 10V Measure at VO = 5V
7.5 5.8 2.2
12 2.5 8.5 4.75
l
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. Note 3: This parameter is not 100% tested. Note 4: The LT1498C/LT1499C are guaranteed to meet specified performance from 0C to 70C. The LT1498C/LT1499C are designed, characterized and expected to meet specified performance from -40C to 85C but are not tested or QA sampled at these temperatures. The LT1498I/LT1499I are guaranteed to meet specified performance from -40C to 85C. The LT1498MP is guaranteed to meet specified performance from -55C to 125C.
Note 5: Matching parameters are the difference between amplifiers A and D and between B and C on the LT1499; between the two amplifiers on the LT1498. Note 6: Output voltage swings are measured between the output and power supply rails. Note 7: VS = 3V, VS = 15V GBW limit guaranteed by correlation to 5V tests. Note 8: VS = 3V, VS = 5V slew rate limit guaranteed by correlation to 15V tests.
14989fe
9
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution, VCM = 0V (PNP Stage)
25 LT1498: N8, S8 PACKAGES LT1499: S14 PACKAGE VS = 5V, 0V VCM = 0V 25 LT1498: N8, S8 PACKAGES LT1499: S14 PACKAGE VS = 5V, 0V VCM = 5V
VOS Distribution VCM = 5V (NPN Stage)
25
VOS Shift for VCM = 0V to 5V
LT1498: N8, S8 PACKAGES LT1499: S14 PACKAGE VS = 5V, 0V VCM = 0V TO 5V
20 PERCENT OF UNITS (%)
20 PERCENT OF UNITS (%)
20 PERCENT OF UNITS (%)
15
15
15
10
10
10
5
5
5
0 -500
-300 100 300 -100 INPUT OFFSET VOLTAGE (V)
500
14989 G01
0 -500
-300 100 300 -100 INPUT OFFSET VOLTAGE (V)
500
14989 G02
0 -500
-300 100 300 -100 INPUT OFFSET VOLTAGE (V)
500
14989 G03
Supply Current vs Supply Voltage
2.0 SUPPLY CURRENT PER AMPLIFIER (mA) TA = 125C TA = 25C 1.5 TA = -55C 1.0 SUPPLY CURRENT PER AMPLIFIER (mA) 2.0
Supply Current vs Temperature
400 VS = 15V 300 1.5 INPUT BIAS CURRENT (nA) VS = 5V, 0V 200 100 0 -100 -200 -300 0 -50 -25 0 75 50 25 TEMPERATURE (C) 100 125 -400
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V
1.0
0.5
0.5
TA = 125C TA = 25C TA = -55C
0
0
4
8 12 16 20 24 28 32 TOTAL SUPPLY VOLTAGE (V)
36
-2
-1
0 2 3 4 5 1 COMMON MODE VOLTAGE (V)
6
14989 G04
14989 G05
14989 G06
Input Bias Current vs Temperature
400 300 INPUT BIAS CURRENT (nA) 200 NPN ACTIVE 100 0 -100 PNP ACTIVE -200 -300 VS = 15V VCM = -15V VS = 5V, 0V VCM = 0V VS = 15V VCM = 15V SATURATION VOLTAGE (mV) VS = 5V, 0V VCM = 5V 1000
Output Saturation Voltage vs Load Current (Output High)
1000
Output Saturation Voltage vs Load Current (Output Low)
100
SATURATION VOLTAGE (mV)
100 TA = 25C TA = 125C 10 TA = -55C
10 TA = -55C TA = 125C TA = 25C 1 0.001 0.01 0.1 1 LOAD CURRENT (mA) 10
14989 G08
-400 -50 -35 -20 -5 10 25 40 55 70 85 100 TEMPERATURE (C)
14989 G07
1 0.001
0.01 0.1 1 LOAD CURRENT (mA)
10
14989 G09
14989fe
10
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Supply Voltage
300 CHANGE IN OFFSET VOLTAGE (V) OUTPUT VOLTAGE (200nV/DIV) 250 200 150 100 TA = 85C 50 TA = 25C 0 1 TA = 70C NONFUNCTIONAL TA = -55C 5
14989 G10
0.1Hz to 10Hz Output Voltage Noise
VS = 2.5V VCM = 0V NOISE VOLTAGE (nV/ Hz) 200 180 160 140 120 100 80 60 40 20 0 0 TIME (1s/DIV)
14989 G11
Noise Voltage Spectrum
VS = 5V, 0V
VCM = 2.5V PNP ACTIVE VCM = 4V NPN ACTIVE
4 2 3 TOTAL SUPPLY VOLTAGE (V)
10
1
10 100 FREQUENCY (Hz)
1000
14989 G12
Noise Current Spectrum
10 9 CURRENT NOISE (pA/Hz) 8 VOLTAGE GAIN (dB) 7 6 5 4 3 2 1 0 1 VCM = 2.5V PNP ACTIVE 10 100 FREQUENCY (Hz) 1000
14989 G13
Gain and Phase vs Frequency
70 60 50 40 30 20 10 0 -10 -20 -30 0.01 0.1 1 10 FREQUENCY (MHz) GAIN PHASE COMMON MODE REJECTION RATIO (dB) RL = 10k VS = 1.5V VS = 15V 180 144 108 72 36 0 -36 -72 PHASE SHIFT (DEG) 120 110 100 90 80 70 60 50 40 30 20
CMRR vs Frequency
VS = 5V, 0V
VS = 15V VS = 2.5V
VCM = 4V NPN ACTIVE
-108 -144 -180 100
14989 G14
1
10
100 1000 FREQUENCY (kHz)
10000
14989 G15
PSRR vs Frequency
90 POWER SUPPLY REJECTION RATIO (dB) 80 70 GAIN BANDWIDTH (MHz) 60 50 40 30 20 10 0 1 10 100 1000 FREQUENCY (kHz) 10000
14989 G16
Gain Bandwidth and Phase Margin vs Supply Voltage
VS = 2.5V 20 18 16 14 12 10 8 6 4 2 0 0 5 25 15 20 10 TOTAL SUPPLY VOLTAGE (V) 30 GAIN BANDWIDTH PHASE MARGIN 100 90 80 PHASE MARGIN (DEG) 70 60 50 40 30 20 10 0 CHANNEL SEPARATION (dB) -50 -60 -70 -80 -90 -100 -110 -120 -130 -140
Channel Separation vs Frequency
VS = 15V VOUT = 1VP-P RL = 2k
POSITIVE SUPPLY NEGATIVE SUPPLY
-10
-150 0.01
0.1
1 10 FREQUENCY (kHz)
100
1000
14989 G18
14989 G17
14989fe
11
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS
Capacitive Load Handling
70 60 50 OVERSHOOT (%) 40 30 20 10 0 10 1000 10000 100 CAPACITIVE LOAD (pF) 100000
14989 G19
Slew Rate vs Supply Voltage
9 8 SLEW RATE (V/s) 7 6 5 4 3 0 4 FALLING EDGE 10 VOUT = 80% OF VS AV = -1 RISING EDGE 8 6 OUTPUT STEP (V) 4 2 0 -2 -4 -6 -8 -10 8 12 16 20 24 28 32 TOTAL SUPPLY VOLTAGE (V) 36
Output Step vs Settling Time to 0.01%
VS = 15V NONINVERTING INVERTING
VS = 5V, 0V AV = 1 RL = 1k
INVERTING NONINVERTING
1.5
2.0
3.0 2.5 SETTLING TIME (s)
3.5
14989 G21
14989 G20
Open-Loop Gain
20 15 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 10 5 0 -5 -10 -15 -20 0 5 -20 -15 -10 -5 10 OUTPUT VOLTAGE (V) 15 20 RL = 2k RL = 10k VS = 15V 4 3 2 1 0 -1 -2 -3 -4
Open-Loop Gain
VS = 5V, 0V CHANGE IN OFFSET VOLTAGE (V) 10
Warm-Up Drift vs Time
S8 PACKAGE, VS = 2.5V 0 N8 PACKAGE, VS = 2.5V LT1499CS, VS = 2.5V S8 PACKAGE, VS = 15V -20 N8 PACKAGE, VS = 15V -30 LT1499CS, VS = 15V -40 0 20 40 60 80 100 120 140 160 TIME AFTER POWER-UP (SEC)
14989 G24
RL = 2k RL = 10k
-10
0
1
4 3 OUTPUT VOLTAGE (V)
2
5
6
14989 G23
14989 G22
Total Harmonic Distortion + Noise vs Peak-to-Peak Voltage
1 f = 1kHz RL = 10k AV = 1 VS = 1.5V AV = -1 VS = 1.5V AV = 1 VS = 2.5V AV = -1 VS = 2.5V 1
Total Harmonic Distortion + Noise vs Frequency
VS = 1.5V VIN = 2VP-P RL = 10k AV = 1
0.1 THD + NOISE (%)
0.01
THD + NOISE (%)
0.1
0.01
AV = -1
0.001
0.0001 0 1 2 3 4 INPUT VOLTAGE (VP-P) 5
14989 G25
0.001 0.01
0.1
1 10 FREQUENCY (kHz)
100
14989 G26
14989fe
12
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS
5V Small-Signal Response 5V Large-Signal Response
5mV/DIV
VS = 5V 200ns/DIV AV = 1 VIN = 20mVP-P AT 50kHz RL = 1k
14989 G27
1V/DIV
VS = 5V 2s/DIV AV = 1 VIN = 4VP-P AT 10kHz RL = 1k
14989 G28
15V Small-Signal Response
15V Large-Signal Response
5mV/DIV
VS = 15V 200ns/DIV AV = 1 VIN = 20mVP-P AT 50kHz RL = 1k
14989 G29
5V/DIV
VS = 15V 2s/DIV AV = 1 VIN = 20VP-P AT 10kHz RL = 1k
14989 G30
APPLICATIONS INFORMATION
Rail-to-Rail Input and Output The LT1498/LT1499 are fully functional for an input and output signal range from the negative supply to the positive supply. Figure 1 shows a simplified schematic of the amplifier. The input stage consists of two differential amplifiers, a PNP stage (Q1/Q2) and an NPN stage (Q3/Q4) which are active over different ranges of input common mode voltage. A complementary common emitter output stage (Q14/Q15) is employed allowing the output to swing from rail-to-rail. The devices are fabricated on Linear Technology's proprietary complementary bipolar process to ensure very similar DC and AC characteristics for the output devices (Q14/Q15). The PNP differential input pair is active for input common mode voltages, VCM, between the negative supply to approximately 1.3V below the positive supply. As VCM moves further toward the positive supply, the transistor (Q5) will steer the tail current, I1, to the current mirror (Q6/Q7) activating the NPN differential pair, and the PNP differential pair becomes inactive for the rest of the input common mode range up to the positive supply. The output is configured with a pair of complementary common emitter stages that enables the output to swing from rail to rail. Capacitors (C1 and C2) form local feedback loops that lower the output impedance at high frequencies.
14989fe
13
LT1498/LT1499 APPLICATIONS INFORMATION
V+ R3 R4 R5 Q15
D1 +IN R6 Q5 D5 -IN R7 Q4 Q3 Q1 D3 D6 D2 VBIAS
I1
Q11
Q12
Q13
C2
V- Q2 Q10 Q9 D4 Q8
CC
OUT
BUFFER AND OUTPUT BIAS C1
Q7 V
-
Q6 R1 R2 Q14
14989 F01
Figure 1. LT1498 Simplified Schematic Diagram
Input Offset Voltage The offset voltage changes depending upon which input stage is active. The input offsets are random, but are trimmed to less than 475V. To maintain the precision characteristics of the amplifier, the change of VOS over the entire input common mode range (CMRR) is guaranteed to be less than 425V on a single 5V supply. Input Bias Current The input bias current polarity also depends on the input common mode voltage, as described in the previous section. When the PNP differential pair is active, the input bias currents flow out of the input pins; they flow in opposite direction when the NPN input stage is active. The offset error due to input bias current can be minimized by equalizing the noninverting and inverting input source impedances. This will reduce the error since the input offset currents are much less than the input bias currents. Overdrive Protection To prevent the output from reversing polarity when the input voltage exceeds the power supplies, two pair of crossing diodes D1 to D4 are employed. When the input
voltage exceeds either power supply by approximately 700mV, D1/D2 or D3/D4 will turn on, forcing the output to the proper polarity. For the phase reversal protection to work properly, the input current must be less than 5mA. If the amplifier is to be severely overdriven, an external resistor should be used to limit the overdrive current. Furthermore, the LT1498/LT1499's input stages are protected by a pair of back-to-back diodes, D5/D6. When a differential voltage of more than 0.7V is applied to the inputs, these diodes will turn on, preventing the Zener breakdown of the input transistors. The current in D5/D6 should be limited to less than 10mA. Internal resistors R6 and R7 (700 total) limit the input current for differential input signals of 7V or less. For larger input levels, a resistor in series with either or both inputs should be used to limit the current. Worst-case differential input voltage usually occurs when the output is shorted to ground. In addition, the amplifier is protected against ESD strikes up to 3kV on all pins. Capacitive Load The LT1498/LT1499 are designed for ease of use. The amplifier can drive a capacitive load of more than 10nF
14989fe
14
LT1498/LT1499 APPLICATIONS INFORMATION
without oscillation at unity gain. When driving a heavy capacitive load, the bandwidth is reduced to maintain stability. Figures 2a and 2b illustrate the stability of the device for small-signal and large-signal conditions with capacitive loads. Both the small-signal and large-signal transient response with a 10nF capacitive load are well behaved. Feedback Components To minimize the loading effect of feedback, it is possible to use the high value feedback resistors to set the gain. However, care must be taken to insure that the pole formed by the feedback resistors and the total input capacitance at the inverting input does not degrade the stability of the amplifier. For instance, the LT1498/LT1499 in a noninverting gain of 2, set with two 30k resistors, will probably oscillate with 10pF total input capacitance (5pF input capacitance + 5pF board capacitance). The amplifier has a 2.5MHz crossing frequency and a 60 phase margin at 6dB of gain. The feedback resistors and the total input capacitance create a pole at 1.06MHz that induces 67 of phase shift at 2.5MHz! The solution is simple, either lower the value of the resistors or add a feedback capacitor of 10pF of more.
VS = 5V AV = 1
14989 F02a
CL = 0pF
CL = 500pF
CL = 10nF
Figure 2a. LT1498 Small-Signal Response
CL = 0pF
CL = 500pF
CL = 10nF
VS = 5V AV = 1
14989 F02b
Figure 2b. LT1498 Large-Signal Response
TYPICAL APPLICATIONS
1A Voltage Controlled Current Source
V+ 0.5 V+ 1k 1k VIN 500pF IOUT RL
1A Voltage Controlled Current Sink
V+
+
1/2 LT1498
100 Si9410DY 500pF 1k
-
1k VIN 1/2 LT1498
100 Si9430DY
-
+
IOUT = V+ - VIN 0.5
14989 TA03
IOUT
RL IOUT = VIN 0.5 tr < 1s 0.5
14989 TA04
tr < 1s
14989fe
15
LT1498/LT1499 TYPICAL APPLICATION
Input Bias Current Cancellation
RG RF SIGNAL AMP VOUT
VIN
1M
22pF
1M
14989 TA05
INPUT BIAS CURRENT LESS THAN 50nA FOR 500mV VIN (V+ - 500mV)
PACKAGE DESCRIPTION
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5
.255 .015* (6.477 0.381)
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381) +.035 .325 -.015 8.255 +0.889 -0.381
.065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
(
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
16
+ +
1/2 LT1498 CANCELLATION AMP
-
1/2 LT1498
-
1
2
3
4 .130 .005 (3.302 0.127)
.045 - .065 (1.143 - 1.651)
.100 (2.54) BSC
14989fe
LT1498/LT1499 PACKAGE DESCRIPTION
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 8 7 6 5
.045 .005 .050 BSC
.245 MIN
.160 .005 .228 - .244 (5.791 - 6.197)
.150 - .157 (3.810 - 3.988) NOTE 3
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT
.010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP
1
2
3
4
.053 - .069 (1.346 - 1.752)
.004 - .010 (0.101 - 0.254)
.016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
SO8 0303
14989fe
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
17
LT1498/LT1499 PACKAGE DESCRIPTION
S Package 14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.045 .005 .050 BSC
N
.337 - .344 (8.560 - 8.738) NOTE 3 14 13 12 11 10 9 8
.245 MIN
N
.160 .005
.228 - .244 (5.791 - 6.197)
1 2 3 N/2
.150 - .157 (3.810 - 3.988) NOTE 3 N/2
.030 .005 TYP
RECOMMENDED SOLDER PAD LAYOUT 1
.010 - .020 x 45 (0.254 - 0.508)
2
3
4
5
6
7
.053 - .069 (1.346 - 1.752)
0 - 8 TYP
.008 - .010 (0.203 - 0.254)
.004 - .010 (0.101 - 0.254)
.016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
S14 0502
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
14989fe
18
LT1498/LT1499 REVISION HISTORY
REV E DATE 10/09 DESCRIPTION Edit in Absolute Maximum Ratings
(Revision history begins at Rev E)
PAGE NUMBER 2
14989fe
19
LT1498/LT1499 TYPICAL APPLICATION
Bidirectional Current Sensor A bidirectional current sensor for battery-powered systems is shown in Figure 3. Two outputs are provided: one proportional to charge current, the other proportional to discharge current. The circuit takes advantage of the LT1498's rail-to-rail input range and its output phase reversal protection. During the charge cycle, the op amp
IL CHARGE VBATTERY DISCHARGE RA RSENSE 0.1 VBATTERY RA
A1 forces a voltage equal to (IL)(RSENSE) across RA. This voltage is then amplified at the Charge Out by the ratio of RB over RA. In this mode, the output of A2 remains high, keeping Q2 off and the Discharge Out low, even though the (+) input of A2 exceeds the positive power supply. During the discharge cycle, A2 and Q2 are active and the operation is similar to the charge cycle.
A2 1/2 LT1498
+ -
+ -
RA
RA
A1 1/2 LT1498
Q2 MTP23P06 DISCHARGE OUT RB
Q1 MTP23P06 CHARGE OUT RB VO = IL
RB R RA SENSE FOR RA = 1k, RB = 10k VO = 1V/A 14989 F03 IL
()
Figure 3. Bidirectional Current Sensor
RELATED PARTS
PART NUMBER DESCRIPTION LTC(R)1152 LT1211/LT1212 LT1213/LT1214 LT1215/LT1216 LT1366/LT1367 LT1490/LT1491 LT1884/LT1885 Rail-to-Rail Input and Output, Zero-Drift Op Amp Dual/Quad 14MHz, 7V/s, Single Supply Precision Op Amps Dual/Quad 28MHz, 12V/s, Single Supply Precision Op Amps Dual/Quad 23MHz, 50V/s, Single Supply Precision Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps COMMENTS High DC Accuracy, 10V VOS(MAX), 100nV/C Drift, 1MHz GBW, 1V/s Slew Rate, Max Supply Current 2.2mA Input Common Mode Includes Ground, 275V VOS(MAX), 6V/C Max Drift, Max Supply Current 1.8mA per Op Amp Input Common Mode Includes Ground, 275V VOS(MAX), 6V/C Max Drift, Max Supply Current 3.5mA per Op Amp Input Common Mode Includes Ground, 450V VOS(MAX), Max Supply Current 6.6mA per Op Amp 475V VOS(MAX), 400kHz GBW, 0.13V/s Slew Rate, Max Supply Current 520A per Op Amp Max Supply Current 50A per Op Amp, 200kHz GBW, 0.07V/s Slew Rate, Operates with Inputs 44V Above V- Independent of V+
Dual/Quad, Rail-to-Rail Output Picoamp Input Precision Op Amps ICC = 650A, VOS < 50V, IB < 400pA
14989fe
20 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 1009 REV E * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2009

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