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FEATURES

LT1638/LT1639 1.2MHz, 0.4V/s Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps DESCRIPTIO
The LT (R)1638 is a low power dual rail-to-rail input and output operational amplifier available in the standard 8-pin PDIP and SO packages as well as the 8-lead MSOP package. The LT1639 is a low power quad rail-to-rail input and output operational amplifier offered in the standard 14-pin PDIP and surface mount packages. For space limited applications the LT1638 is available in a 3mm x 3mm x 0.8mm dual fine pitch leadless package (DFN). The LT1638/LT1639 op amps operate on all single and split supplies with a total voltage of 2.5V to 44V drawing only 170A of quiescent current per amplifier. These amplifiers are reverse battery protected and draw no current for reverse supply up to 18V. The input range of the LT1638/LT1639 includes both supplies, and a unique feature of this device is its capability to operate over the top with either or both of its inputs above V +. The inputs handle 44V, both differential and common mode, independent of supply voltage. The input stage incorporates phase reversal protection to prevent false outputs from occurring when the inputs are below the negative supply. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced below the negative supply. The LT1638/LT1639 can drive loads up to 25mA and still maintain rail-to-rail capability. The op amps are unity-gain stable and drive all capacitive loads up to 1000pF when optional output compensation is used.
Output Voltage vs Input Voltage
Operates with Inputs Above V + Rail-to-Rail Input and Output Low Power: 230A per Amplifier Max Gain Bandwidth Product: 1.2MHz Slew Rate: 0.4V/s High Output Current: 25mA Min Specified on 3V, 5V and 15V Supplies Reverse Battery Protection to 18V No Supply Sequencing Problems High Voltage Gain: 1500V/mV Single Supply Input Range: - 0.4V to 44V High CMRR: 98dB No Phase Reversal Available in 14-Lead SO, 8-Lead MSOP and DFN Packages
APPLICATIO S

Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring Micropower Active Filters 4mA to 20mA Transmitters
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Over-The-Top is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
10k V1 VCC 1M
Over-The-Top(R) Comparator with 100mV Hysteresis Centered at 0mV
VCC 1M VCC
5V
+
A 1/2 LT1638
+
B 1/2 LT1638 1M V0
-
10k V2 1M
-
0V
1638/39 TA01
VCC = 5V, VCM = 0V TO 44V, tPD = 27s
U
U
U
20mV/DIV
1638/39 TA02
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LT1638/LT1639
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V -) .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... 25mA Output Short-Circuit Duration (Note 2) .........Continuous Operating Temperature Range (Note 3) LT1638C/LT1639C ............................. - 40C to 85C LT1638I/LT1639I ................................ - 40C to 85C LT1638H/LT1639H ........................... - 40C to 125C
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
TOP VIEW
TOP VIEW OUT A -IN A +IN A V- 1 2 3 4 8 7 6 5 V+ OUT B -IN B +IN B
LT1638CMS8 LT1638IMS8 MS8 PART MARKING* LTCY
A B
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 300C/W (MS8)
ORDER PART NUMBER
TOP VIEW OUT A -IN A +IN A V- 1 2 3 4 A B 8 7 6 5 V+ OUT B -IN B +IN B
LT1638CDD LT1638IDD
DD PART MARKING* LAAL
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 160C/W (NOTE 10) UNDERSIDE METAL INTERNALLY CONNECTED TO V -
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ *The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
WW U
W
(Note 1)
Specified Temperature Range (Note 4) LT1638C/LT1639C ............................. - 40C to 85C LT1638I/LT1639I ................................ - 40C to 85C LT1638H/LT1639H ........................... - 40C to 125C Junction Temperature ........................................... 150C DD Package ...................................................... 125C Storage Temperature Range ................. - 65C to 150C DD Package ...................................... - 65C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER
OUT A -IN A +IN A V- 1 2 A 3 B 4 5 +IN B 6 -IN B 8 7 V+ OUT B
LT1638CN8 LT1638IN8 LT1638CS8 LT1638IS8 LT1638HS8 S8 PART MARKING 1638 1638I 1638H ORDER PART NUMBER LT1639CN LT1639IN LT1639CS LT1639IS LT1639HS
N8 PACKAGE 8-LEAD PDIP
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 150C/W (N8) TJMAX = 150C, JA = 190C/W (S8)
TOP VIEW OUT A -IN A +IN A V+ +IN B -IN B OUT B 1 2 3 4 5 6 7 B C A D 14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 8 - IN C OUT C
N PACKAGE 14-LEAD PDIP
S PACKAGE 14-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/W (N) TJMAX = 150C, JA = 160C/W (S)
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LT1638/LT1639 ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT1638 N, S Packages 0C TA 70C - 40C TA 85C LT1639 N, S Packages 0C TA 70C - 40C TA 85C LT1638 MS8 Package 0C TA 70C - 40C TA 85C LT1638 DD Package 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current VCM = 44V (Note 5) Input Bias Current VCM = 44V (Note 5) VS = 0V 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = 0V to 44V

LT1638C/LT1639C, LT1638I/LT1639I MIN TYP MAX 200 600 850 950 300 700 950 1050 350 900 1150 1450 1100 1350 1450 6 7 6 2.5 50 30
UNITS V V V V V V V V V V V V V/C V/C nA A nA A nA VP-P nV/Hz pA/Hz M M
400

LT1638/LT1639 N, S Packages LT1638MS8, LT1638DD
2 2.5 1 20 8 0.1 1 20 0.3 1 1.4 0 88 80 200 133 100 400 250 200 98 88 1500 2.5 5.5 5
Input Noise Voltage en in RIN CIN CMRR AVOL Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain
44
pF V dB dB V/mV V/mV V/mV V/mV V/mV V/mV
VCM = 0V to VCC - 1V VCM = 0V to 44V (Note 8) VS = 3V, VO = 500mV to 2.5V, RL = 10k 0C TA 70C - 40C TA 85C VS = 5V, VO = 500mV to 4.5V, RL = 10k 0C TA 70C - 40C TA 85C VS = 3V, No Load VS = 3V, ISINK = 5mA VS = 5V, No Load VS = 5V, ISINK = 10mA

1500
VOL
Output Voltage Swing Low
3 250 3 500 2.94 2.25 4.94 3.8 10 15 15 15 2.98 2.40 4.98 4.0 15 25 20 25
8 450 8 700
mV mV mV mV V V V V mA mA mA mA
VOH
Output Voltage Swing High
VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA
ISC
Short-Circuit Current (Note 2)
VS = 3V, Short to GND VS = 3V, Short to VCC VS = 5V, Short to GND VS = 5V, Short to VCC
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LT1638/LT1639 ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4)
SYMBOL PSRR PARAMETER Power Supply Rejection Ratio Reverse Supply Voltage Minimum Operating Supply Voltage IS GBW Supply Current per Amplifier (Note 6) Gain Bandwidth Product (Note 5) Slew Rate (Note 7) f = 5kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = 0C TA 70C - 40C TA 85C CONDITIONS VS = 3V to 12.5V, VCM = VO = 1V IS = - 100A per Amplifier LT1638C/LT1639C, LT1638I/LT1639I MIN TYP MAX 90 100

UNITS dB V V A A kHz kHz kHz V/s V/s V/s
18
27 2.4 170
2.7 230 275
SR
650 550 500 0.210 0.185 0.170
1075
0.38
The denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT1638 N, S Packages 0C TA 70C - 40C TA 85C LT1639 N, S Packages 0C TA 70C - 40C TA 85C LT1638 MS8 Package 0C TA 70C - 40C TA 85C LT1638 DDPackage 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 9) IOS IB en in RIN CIN CMRR AVOL Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain
MIN

TYP 250
350

MAX 800 1000 1100 900 1100 1200 1050 1250 1550 1250 1450 1550 6 7 6 50
UNITS V V V V V V V V V V V V V/C V/C nA nA VP-P nV/Hz pA/Hz M M pF
400

450

LT1638/LT1639 N, S Packages LT1638MS8, LT1638DD
2 2.5 1 20 1 20 1 0.3 2.5 500 4.5
0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = - 15V to 14V
VCM = -15V to 29V VO = 14V, RL = 10k 0C TA 70C - 40C TA 85C No Load IOUT = 10mA

- 15 80 200 125 100 14.9 13.7
29 88 500
V dB V/mV V/mV V/mV V V
VO
Output Voltage Swing
14.95 14.0
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LT1638/LT1639 ELECTRICAL CHARACTERISTICS
SYMBOL ISC PARAMETER Short-Circuit Current (Note 2)
The denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I CONDITIONS Short to GND 0C TA 70C - 40C TA 85C VS = 1.5V to 22V

MIN 25 20 15 90
TYP 40
MAX
UNITS mA mA mA dB
PSRR IS GBW
Power Supply Rejection Ratio Supply Current per Amplifier Gain Bandwidth Product
100 205 280 350
A A kHz kHz kHz V/s V/s V/s
f = 5kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = , VO = 10V, 0C TA 70C - 40C TA 85C

750 650 600 0.225 0.2 0.18
1200
SR
Slew Rate
0.4
The denotes the specifications which apply over the full operating temperature range of -40C TA 125C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = Half Supply unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT1638S8
LT1639S
Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current VCM = 44V (Note 5) Input Bias Current VCM = 44V (Note 5) CMRR AVOL Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain VCM = 0.3V to VCC - 1V VCM = 0.3V to 44V VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 5V, VO = 500mV to 4.5V, RL = 10k VOL Output Voltage Swing Low No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA PSRR Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage Supply Current (Note 6) Gain Bandwidth Product (Note 5) Slew Rate (Note 7) VS = 3V to 12.5V, VCM = VO = 1V IS = - 100A

LT1638H/LT1639H MIN TYP MAX 200 650 3 300 750 3.2 15 15 10 150 100 0.3 76 72 200 20 400 35 44
UNITS V mV V mV V/C nA A nA A V dB dB V/mV V/mV V/mV V/mV mV mV
mV
1500 1500 15 900 1500
VOH
Output Voltage Swing High
2.9 2 4.9 3.5 80 2.7 18 170 230 450
V V V V dB V V A A kHz kHz V/s V/s
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IS GBW SR
f = 5kHz
AV = - 1, RL =
650 350 0.21 0.1
1075 0.38
5
LT1638/LT1639 ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating temperature range of -40C TA 125C, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V - unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT1638S8
LT1638H/LT1639H MIN TYP MAX 250 850 3.4 350 950 3.6 15 25 250 72 200 15 14.8 14 13.4 84 1.35 205 280 550 500
UNITS V mV V mV V/C nA nA dB V/mV V/mV V V
V
LT1639S
IOS IB CMRR AVOL VO
Input Offset Voltage Drift (Note 9) Input Offset Current Input Bias Current Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing VCM = -14.7V to 29V VO = 14V, RL = 10k No Load IOUT = 5mA IOUT = 10mA VS = 1.5V to 22V

PSRR IS GBW SR
Power Supply Rejection Ratio Minimum Supply Voltage Supply Current Gain Bandwidth Product Slew Rate
dB V A A kHz kHz V/s V/s
f = 5kHz
AV = - 1, RL = , VO = 10V, Measure at VO = 5V
750 400 0.225 0.1
1200 0.4
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 absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Note 3: The LT1638C/LT1639C and LT1638I/LT1639I are guaranteed functional over the operating temperature range of -40C to 85C. The LT1638H/LT1639H are guaranteed functional over the operating temperature range of - 40C to 125C. Note 4: The LT1638C/LT1639C are guaranteed to meet specified performance from 0C to 70C and are designed, characterized and expected to meet specified performance from -40C to 85C but not tested or QA sampled at these temperatures. The LT1638I/LT1639I are guaranteed to meet specified performance from -40C to 85C. The LT1638H/LT1639H are guaranteed to meet specified performance from -40C to 125C.
Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 15V or VS = 22V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 15V or VS = 22V tests. Note 7: Guaranteed by correlation to slew rate at VS = 15V, and GBW at VS = 3V and VS = 15V tests. Note 8: This specification implies a typical input offset voltage of 2mV at VCM = 44V and a maximum input offset voltage of 5mV at VCM = 44V. Note 9: This parameter is not 100% tested. Note 10: The JA specified for the DD package is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value.
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LT1638/LT1639 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
300 280 260 240 220 200 180 160 140 120 100 0 5 10 15 20 25 30 35 SUPPLY VOLTAGE (V) 40 45 TA = -55C TA = 25C TA = 125C
CHANGE IN INPUT OFFSET VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER (A)
200 100 0 -100 -200 -300 TA = 25C TA = 125C TA = -55C
INPUT BIAS CURRENT (nA)
Output Saturation Voltage vs Load Current (Output High)
1 OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) VS = 2.5V VOD = 30mV 1
TA = 125C 0.1 TA = 25C
0.1 TA = 25C
TA = 125C
OUTPUT SATURATION VOLTAGE (mV)
TA = -55C
0.01 0.001
0.01 0.1 1 SOURCING LOAD CURRENT (mA)
0.1Hz to 10Hz Noise Voltage
70
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
INPUT NOISE CURRENT DENSITY (pA/Hz)
VS = 2.5 NOISE VOLTAGE (400nV/DIV)
0
1
2
3
456 TIME (SEC)
7
UW
1638/39 G01
Minimum Supply Voltage
400 300 10000 8000 6000
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V
60 40 20 0 -20
TA = -55C
TA = 125C TA = 25C
- 400
0
1 3 4 2 TOTAL SUPPLY VOLTAGE (V)
5
1638/39 G02
-40 4.0
4.4 5.2 5.6 4.8 COMMON MODE VOLTAGE (V)
44
1638/39 G03
Output Saturation Voltage vs Load Current (Output Low)
100 VS = 2.5V VOD = 30mV
Output Saturation Voltage vs Input Overdrive
VS = 2.5V NO LOAD OUTPUT HIGH
10
0.01 TA = -55C
OUTPUT LOW
10
0.001 0.001
0.01 0.1 1 SINKING LOAD CURRENT (mA)
10
1638/39 G05
1
0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
1638/39 G06
1638/39 G04
Noise Voltage Density vs Frequency
4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0
1 10 100 FREQUENCY (Hz) 1k
1638/39 G09
Input Noise Current Density vs Frequency
60 50 40 30 20 10 0
8
9
10
1
10 100 FREQUENCY (Hz)
1k
1638/39 G08
1638/39 G07
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LT1638/LT1639 TYPICAL PERFORMANCE CHARACTERISTICS
Gain and Phase Shift vs Frequency
80 70 60 PHASE 50 100 VS = 2.5V 90
GAIN BANDWIDTH PRODUCT (kHz)
SLEW RATE (V/s)
GAIN (dB)
40 30 20 10 0 GAIN
-10 -20 1 10 100 FREQUENCY (kHz)
Gain Bandwidth Product and Phase Margin vs Supply Voltage
1500 60
1500
POWER SUPPLY REJECTION RATIO (dB)
GAIN BANDWIDTH PRODUCT (kHz)
1400 PHASE MARGIN 1300 GAIN BANDWIDTH
50
GAIN BANDWIDTH PRODUCT (kHz)
1200
1100
1000 0 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V)
CMRR vs Frequency
120
COMMON MODE REJECTION RATIO (dB)
110 100 90 80 70 60 50 40 30 20 1
VS = 15V
CHANNEL SEPARATION (dB)
110 100 90 80 70 60 0.1
OUTPUT IMPEDANCE ()
10 100 FREQUENCY (kHz)
8
UW
1638/39 G12
1638/39 G15
Gain Bandwidth Product vs Temperature
1500 f = 1kHz 1400 1300 VS = 15V 1200 1100 1000 VS = 2.5V 900 800 -50 -25
0.55 0.50 0.60
Slew Rate vs Temperature
80 70 60 50 40 30 20 10 0 1000
RISING, VS = 15V RISING, VS = 2.5V
PHASE SHIFT (DEG)
0.45 0.40 0.35 0.30 0.25 -50 -25 FALLING, VS = 2.5V FALLING, VS = 15V
50 25 0 75 TEMPERATURE (C)
100
125
50 25 0 75 TEMPERATURE (C)
100
125
1638/39 G13
1638/39 G14
Gain Bandwidth Product and Phase Margin vs Load Resistance
1400 1300 PHASE MARGIN 1200 1100 1000 900 800 1 10 LOAD RESISTANCE (k) GAIN BANDWIDTH PRODUCT 30 20 10 0 -10 100
1638/39 G17
PSRR vs Frequency
60 50
VS = 2.5V AV = -1 RF = RG = 100k f = 1kHz
90 80 70 60 50 40 30 20 10 0 -10 1 10 100 FREQUENCY (kHz) NEGATIVE SUPPLY
VS = 2.5V
PHASE MARGIN (DEG)
PHASE MARGIN (DEG)
40
40
POSITIVE SUPPLY
30
20
10 45
1000
1638/39 G16
Channel Separation vs Frequency
130 120 1k VS = 15V 10k
Output Impedance vs Frequency
VS = 2.5V AV = 10
100
AV = 100
10 AV = 1 1
1000
1638/39 G18
1 10 FREQUENCY (kHz)
100
1638/39 G19
0.1 0.1
1
10 100 FREQUENCY (kHz)
1000
1638/39 G20
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LT1638/LT1639 TYPICAL PERFORMANCE CHARACTERISTICS
Settling Time to 0.1% vs Output Step
10 8 6 VS = 15V AV = 1 AV = -1 100 90 80 VS = 5V, 0V VCM = 2.5V ISOURCE = 150A
OUTPUT SWING (VP-P)
OUTPUT STEP (V)
OVERSHOOT (%)
4 2 0 -2 -4 -6 -8 -10 0 5 AV = 1
AV = -1
20 15 10 25 SETTLING TIME (s)
Total Harmonic Distortion + Noise vs Frequency
10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 20k
THD + NOISE (%)
1 THD + NOISE (%)
VS = 1.5V VIN = 1V 0.1 VS = 3V, 0V VIN = 0.5V TO 2.5V VS = 3V, 0V VIN = 0.2V TO 2.2V
THD + NOISE (%)
0.1
0.01
AV = -1 AV = 1
0.001 0.01
0.1
1 10 FREQUENCY (Hz)
Open-Loop Gain
CHANGE IN INPUT OFFSET VOLTAGE (50V/DIV)
RL = 2k RL = 10k RL = 50k
-20V
-10V 10V 0V OUTPUT VOLTAGE (5V/DIV)
UW
30
1638/39 G21
Capacitive Load Handling, Overshoot vs Capacitive Load
35 30 25 20 15 10 5
Undistorted Output Swing vs Frequency
VS = 15V DISTORTION 1% RL = 20k
70 60 50 40 30 20 10 0 AV = 1 AV = 10 AV = 5
VS = 2.5V
35
10
100 1000 CAPACITIVE LOAD (pF)
10000
1638/39 G22
0 0.1
1 10 FREQUENCY (kHz)
100
1638/39 G23
Total Harmonic Distortion + Noise vs Load Resistance
10 VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz 1
1 10
Total Harmonic Distortion + Noise vs Output Voltage
RL = 10k, f = 1kHz VCM = HALF SUPPLY AV = -1, VS = 1.5V AV = -1, VS = 3V, 0V AV = 1, VS = 1.5V AV = 1, VS = 3V, 0V
0.1
0.01
0.01
100
1638/39 G24
0.001 0.1
0.001
1 10 LOAD RESISTANCE TO GROUND (k)
100
0
2 1 OUTPUT VOLTAGE (VP-P)
3
1638/39 G26
1638/39 G25
Large-Signal Response
VS = 15V
Small-Signal Response
VS = 15V AV = 1
1638/39 G28
VS = 15V AV = 1 CL = 15pF
1638/39 G29
20V
1638/39 G27
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LT1638/LT1639
APPLICATIONS INFORMATION
Supply Voltage The positive supply pin of the LT1638/LT1639 should be bypassed with a small capacitor (typically 0.1F) within an inch of the pin. When driving heavy loads an additional 4.7F electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1638/LT1639 are protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is less than 1nA. The LT1638/LT1639 can be shut down by removing V +. In this condition the input bias current is less than 0.1nA, even if the inputs are 44V above the negative supply. At temperatures greater than 70C, when operating the LT1638/LT1639 on total supplies of 10V or more, the supply must not be brought up faster than 1V/s. Increasing the bypass capacitor and/or adding a small resistor in series with the supply will limit the rise time. Inputs The LT1638/LT1639 have two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.8V or more below V +, the PNP input stage is active and the input bias current is typically - 20nA. When the input common mode voltage is within 0.5V of the positive rail, the NPN stage is operating and the input bias current is typically 40nA. Increases in temperature will cause the voltage at which operation switches from the PNP input stage to the NPN input stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 600V. A Schottky diode in the collector of each NPN transistor allow the LT1638/LT1639 to operate over the top, with either or both of its inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 8A at room temperature. The input offset voltage is typically 2mV when operating above V +. The LT1638/LT1639 will operate with its inputs 44V above V - regardless of V +. The inputs are protected against excursions of 2V below V - by an internal 1k resistor in series with each input and a diode from the input to the negative supply. If the inputs can go more than 2V below V -, an additional external resistor is required. A 10k resistor will protect the input against excursions as much as 10V below V -. The input stage of the LT1638/LT1639 incorporates phase reversal protection to prevent the output from phase reversing for inputs below V -. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output of the LT1638/LT1639 can swing within 20mV of the positive rail with no load, and within 3mV of the negative rail with no load. When monitoring voltages within 20mV of the positive rail or within 3mV of the negative rail, gain should be taken to keep the output from clipping. The LT1638/LT1639 are capable of sinking and sourcing over 40mA on 15V supplies; sourcing current capability is reduced to 20mA at 5V total supplies as noted in the electrical characteristics. The LT1638/LT1639 are internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.22F capacitor in series with a 150 resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 1000pF, at all output currents.
Optional Output Compensation for Capacitive Loads Greater than 200pF
10
U
W
U
U
VIN
+
LT1638
-
0.22F 150
1000pF
Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by
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LT1638/LT1639
APPLICATIONS INFORMATION
nonlinear common mode rejection. If the op amp is operating inverting there is no common mode induced distortion. If the op amp is operating in the PNP input stage (input is not within 0.8V of V +), the CMRR is very good, typically 98dB. When the LT1638 switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1638/LT1639 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + - 0.8V). See the Typical Performance Characteristics curves. Gain The open-loop gain is almost independent of load when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance curve of Open-Loop Gain for various loads shows the details.
VCC R5 100k
TYPICAL APPLICATIONS
With 1.2MHz bandwidth, Over-The-Top capability, reverse-battery protection and rail-to-rail input and output features, the LT1638/LT1639 are ideal candidates for general purpose applications. The lowpass slope limiting filter in Figure 1 limits the maximum dV/dT (not frequency) that it passes. When the input signal differs from the output by one forward diode drop, D1 or D2 will turn on. With a diode on, the voltage across R2 will be constant and a fixed current, VDIODE/R2, will flow through capacitor C1, charging it linearly instead of exponentially. The maximum slope that the circuit will pass is equal to VDIODE divided by (R2)(C1). No matter how fast the input changes the output will never change any faster than the dV/dT set by the diodes and (R2)(C).
D1 D2 R1 VIN VD d V = dt OUT(MAX) (R2)(C1) FOR R1 = 10k, R2 = 100k, C1 = 1000pF d V = 0.006V/s dt OUT(MAX) R2
+
C1 1/2 LT1638 VOUT
-
1638/39 F01
Figure 1. Lowpass Slope Limiting Filter
A modification of this application is shown in Figure 2 using references instead of diodes to set the maximum slope. By using references, the slope is independent of temperature. A scope photo shows a 1VP-P, 2kHz input signal with a 2V pulse added to the sine wave; the circuit passes the 2kHz signal but limits the slope of the pulse.
U
W
U
U
U
+
1/4 LT1639 D1 R3 100k D2
-
LT1634-1.2V
-
R1 1k VIN C1 R4 100k LT1634-1.2V D4 R2 1/4 LT1639 VOUT
+
D3
-
1/4 LT1639
FOR R2 = 50k, C1 = 500pF, MAXIMUM SLOPE = 0.048V/s 1.2V d = V dt OUT (R2)(C1) D1 TO D4 = IN4148
+
R6 100k
1638/39 F02
VEE
Response of Slope Limiting Filter
VOUT
VIN
1638/39 TA02
Figure 2. Lowpass Slope Limiting Filter with 0 TC
16389fd
11
LT1638/LT1639
TYPICAL APPLICATIONS
The application in Figure 3 utilizes the Over-The-Top capabilities of the LT1638. The 0.2 resistor senses the load current while the op amp and NPN transistor form a closed loop making the collector current of Q1 proportional to the load current. As a convenient monitor, the 2k load resistor converts the current into a voltage. The positive supply rail, V +, is not limited to the 5V supply of the op amp and could be as high as 44V.
V+ 200 5V 0.2 200 LOAD ILOAD VOUT = (2)(ILOAD)
+
1/2 LT1638 Q1 2N3904 0V TO 4.3V 2k
1638/39 F03
-
Figure 3. Positive Supply Rail Current Sense
SI PLIFIED SCHE ATIC
V+ Q1 D1 R1 6k Q4 - IN Q17 Q20 OUT Q16 Q15 Q9 Q10 Q13 Q14 Q21 Q18 R3 1k 10A +IN Q7 Q8 Q11 Q12 R2 1k D2 Q2 D3 Q3 Q22
+
Q5
Q6
ONE AMPLIFIER
12
U
D4
The Figure 4 application uses the LT1638 in conjunction with the LT1634 micropower shunt reference. The supply current of the op amp also biases the reference. The drop across resistor R1 is fixed at 1.2V generating an output current equal to 1.2V/R1.
VCC LT1634-1.2
VCC R1
+
1/2 LT1638 IOUT = 1.2V R1 IOUT
1638/39 F04
-
Figure 4. Current Source
W
W
Q19
D5
R4 8k
R5 8k V-
1638/39 SS
16389fd
LT1638/LT1639
PACKAGE DESCRIPTION
DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115 TYP 5 0.675 0.05 0.38 0.10 8
3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6)
0.889 0.127 (.035 .005)
5.23 (.206) MIN
3.20 - 3.45 (.126 - .136)
0.42 0.038 (.0165 .0015) TYP
0.65 (.0256) BSC
DETAIL "A"
RECOMMENDED SOLDER PAD LAYOUT
0.18 (.007)
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
U
3.00 0.10 (4 SIDES)
1.65 0.10 (2 SIDES)
(DD) DFN 1203
0.200 REF
0.75 0.05
4 0.25 0.05 2.38 0.10 (2 SIDES)
1 0.50 BSC
0.00 - 0.05
BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
3.00 0.102 (.118 .004) (NOTE 3) 0.52 (.0205) REF
8
7 65
0.254 (.010)
GAUGE PLANE
DETAIL "A" 0 - 6 TYP
4.90 0.152 (.193 .006)
3.00 0.102 (.118 .004) (NOTE 4)
1 0.53 0.152 (.021 .006) 1.10 (.043) MAX
23
4 0.86 (.034) REF
SEATING PLANE
0.22 - 0.38 (.009 - .015) TYP
0.65 (.0256) BSC
0.127 0.076 (.005 .003)
MSOP (MS8) 0204
16389fd
13
LT1638/LT1639
PACKAGE DESCRIPTION
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 .300 - .325 (7.620 - 8.255) .045 - .065 (1.143 - 1.651) .130 .005 (3.302 0.127) 7 6 5
.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
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP
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)
14
U
.255 .015* (6.477 0.381)
1
2
3
4
.100 (2.54) BSC
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
1
2
3
4
.053 - .069 (1.346 - 1.752)
.004 - .010 (0.101 - 0.254)
.016 - .050 (0.406 - 1.270)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
SO8 0303
16389fd
LT1638/LT1639
PACKAGE DESCRIPTION
N Package 14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770* (19.558) MAX 14 13 12 11 10 9 8
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381) +.035 .325 -.015 .005 (0.127) .100 MIN (2.54) BSC
(
+0.889 8.255 -0.381
)
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
.045 .005 .050 BSC N 14 13
.245 MIN
.160 .005 .228 - .244 (5.791 - 6.197) 1 2 3 N/2 N/2
.030 .005 TYP
RECOMMENDED SOLDER PAD LAYOUT 1 .010 - .020 x 45 (0.254 - 0.508) 2 3 4 5 6 7
NOTE: 1. DIMENSIONS IN
INCHES .008 - .010 (MILLIMETERS) (0.203 - 0.254) 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)
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.
U
.255 .015* (6.477 0.381)
1 .130 .005 (3.302 0.127) .020 (0.508) MIN
2
3
4
5
6
7
.045 - .065 (1.143 - 1.651)
.065 (1.651) TYP .120 (3.048) MIN .018 .003 (0.457 0.076)
N14 1103
S Package 14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 - .344 (8.560 - 8.738) NOTE 3 12 11 10 9 8
N .150 - .157 (3.810 - 3.988) NOTE 3
.053 - .069 (1.346 - 1.752)
0 - 8 TYP
.004 - .010 (0.101 - 0.254)
.016 - .050 (0.406 - 1.270)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
S14 0502
16389fd
15
LT1638/LT1639
TYPICAL APPLICATION
The battery monitor in Figure 5 also demonstrates the LT1638's ability to operate with its inputs above the positive rail. In this application, a conventional amplifier would be limited to a battery voltage between 5V and ground, but the LT1638 can handle battery voltages as high as 44V. When the battery is charging, Amp B senses the voltage drop across RS. The output of Amp B causes Q2 to drain sufficient current through RB to balance the input of Amp B. Likewise, Amp A and Q1 form a closed loop when the battery is discharging. The current through Q1 or Q2 is proportional to the current in RS and this current flows into RG and is converted into a voltage. Amp D buffers and amplifies the voltage across RG. Amp C compares the output of Amp A and Amp B to determine the polarity of current through RS. The scale factor for VOUT with S1 open is 1V/A. With S1 closed the scale factor is 1V/100mA and currents as low as 500A can be measured.
CHARGER VOLTAGE
RS, 0.2
IBATT
LOAD
IBATT =
VOUT V = OUT AMPS (RS)(RG /RA)(GAIN) GAIN
RELATED PARTS
PART NUMBER
LT1078/LT1079 LT2078/LT2079 LT1178/LT1179 LT2178/LT2179 LT1366/LT1367 LT1490/LT1491 LT1636
DESCRIPTION
Dual/Quad 55A Max, Single Supply, Precision Op Amps Dual/Quad 17A Max, Single Supply, Precison Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
U
+
RA, 2k
+
A 1/4 LT1639
Q1 2N3904
RA', 2k
+
C 1/4 LT1639 LOGIC
-
-
RB, 2k
+
B 1/4 LT1639
Q2 2N3904
LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING
RB', 2k VBATT = 12V
-
RG 10k S1 10k
+
D 1/4 LT1639 VOUT
-
90.9k
1638/39 F05
S1 = OPEN, GAIN = 1 S1 = CLOSED, GAIN = 10
RA = RB VS = 5V, 0V
Figure 5. Battery Monitor
COMMENTS
Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 2.5V/C Drift (Max), 200kHz GBW, 0.07V/s Slew Rate Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 4V/C Drift (Max), 85kHz GBW, 0.04V/s Slew Rate 475V VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW Single Supply Input Range: - 0.4V to 44V, Micropower 50A per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW 55A Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function
16389fd LT 0707 REV D * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1998

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