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LT1490A Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp
FEATURES
s s s s s s
DESCRIPTIO
s s s s s s s s s
Low Input Offset Voltage: 500V Max Output Swings to 10mV Max from V - Rail-to-Rail Input and Output Micropower: 50A/Amplifier Max MSOP Package Over-The-TopTM Input Common Mode Range Extends 44V Above V -, Independent of V + Specified on 3V, 5V and 15V Supplies High Output Current: 20mA Output Drives 10,000pF with Output Compensation Reverse Battery Protection to 18V No Supply Sequencing Problems High Voltage Gain: 1500V/mV High CMRR: 98dB No Phase Reversal Gain Bandwidth Product: 200kHz
APPLICATIO S
s
s s s s
Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring Micropower Active Filters 4mA to 20mA Transmitters
The LT (R)1490A is an enhanced version of the popular LT1490 op amp with improved input offset voltage (500V max) and output voltage swing (10mV max from V -). It is recommended for all new designs. The LT1490A operates on all single and split supplies with a total voltage of 2V to 44V, drawing only 40A of quiescent current per amplifier. It is reverse supply protected; it draws virtually no current for reverse supply up to 18V. The input range of the LT1490A includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490A can drive heavy loads; its rail-to-rail output drives 20mA. The LT1490A is unity-gain stable and drives all capacitive loads up to 10,000pF when optional 0.22F and 150 compensation is used. The LT1490A has a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 15V. There is no phase reversal of the output for inputs 15V below V - or 44V above V -, independent of V +. The LT1490A dual op amp is available in the 8-pin MSOP, PDIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
CHARGER VOLTAGE
Battery Monitor
RS 0.2 IBATT RA 2k RA 2k
+
1/2 LT1490A
Q1 2N3904
-
1/2 LT1490A LOGIC
-
Q2 2N3904
+
RB 2k RB 2k LOAD
+
1/2 LT1490A
LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING
-
RG 10k S1 10k
+
1/2 LT1490A VOUT
+
VBATT = 12V
-
90.9k
14901A TA01
VOUT V IBATT = = OUT AMPS (RS)(RG /RA)(GAIN) GAIN
S1 = OPEN, GAIN = 1 S1 = CLOSED, GAIN = 10
RA = RB VS = 5V, 0V
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U
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1
LT1490A
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V + to V -) ............................. 44V Differential Input Voltage ........................................ 44V Input Current ..................................................... 12mA Output Short-Circuit Duration (Note 2) ........ Continuous Junction Temperature .......................................... 150C Operating Temperature Range (Note 3) ............................................. - 40C to 85C Specified Temperature Range (Note 4) .. - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
TOP VIEW OUT A -IN A +IN A V- 1 2 3 4 8 V+ 7 OUT B 6 -IN B 5 +IN B
TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 B 4 5 +IN B 6 -IN B 8 7 V+ OUT B
LT1490ACMS8 LT1490AIMS8 MS8 PART MARKING LTNG LTPU
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 250C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage (Note 5)
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4)
CONDITIONS N8, S8 Package 0C TA 70C - 40C TA 85C MS8 Package 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 9) - 40C TA 85C VCM = 44V (Note 6)
q q
IOS IB
Input Offset Current Input Bias Current VCM = 44V (Note 6) VS = 0V Input Noise Voltage 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = 0V to 44V
en in RIN
Input Noise Voltage Density Input Noise Current Density Input Resistance
2
U
U
W
WW U
W
ORDER PART NUMBER LT1490ACN8 LT1490ACS8 LT1490AIN8 LT1490AIS8 S8 PART MARKING 1490A 1490AI
N8 PACKAGE 8-LEAD PDIP
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
MIN
TYP 110
MAX 500 700 800 1000 1200 1400 4 0.8 0.8 8 10
UNITS V V V V V V V/C nA A nA A nA VP-P nV/Hz pA/Hz M M
220
q q q q q q q
2 0.2 1 3 0.3 1 50 0.03 6 4 17 11
LT1490A ELECTRICAL CHARACTERISTICS
SYMBOL CIN CMRR AVOL PARAMETER Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 6) Large-Signal Voltage Gain VCM = 0V to VCC - 1V VCM = 0V to 44V 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 VOL Output Voltage Swing Low VS = 3V, No Load VS = 3V, ISINK = 5mA VS = 5V, No Load VS = 5V, ISINK = 5mA VS = 5V, ISINK = 10mA 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 PSRR Power Supply Rejection Ratio Minimum Operating Supply Voltage Reverse Supply Voltage IS GBW Supply Current per Amplifier (Note 7) Gain Bandwidth Product (Note 6) Slew Rate (Note 8) f = 1kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = 0C TA 70C - 40C TA 85C IS = - 100A per Amplifier VS = 2.5V to 12.5V, VCM = VO = 1V
q q q q q q q q q q q q q q q q q q q q q q q
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4)
CONDITIONS MIN 0 84 80 200 133 100 400 250 200 98 98 1500 TYP 4.6 44 MAX UNITS pF V dB dB V/mV V/mV V/mV V/mV V/mV V/mV 10 450 10 500 500 mV mV mV mV mV V V V V mA mA mA mA dB 2.5 50 55 V V A A kHz kHz kHz V/s V/s V/s
1500
3 250 3 250 330 2.95 2.55 4.95 4.30 10 10 15 15 84 18 2.978 2.6 4.978 4.6 15 30 25 30 98 2 27 40 110 100 90 0.035 0.031 0.030 180
SR
0.06
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 15V unless otherwise noted. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage (Note 5) CONDITIONS N8, S8 Package 0C TA 70C - 40C TA 85C MS8 Package 0C TA 70C - 40C TA 85C
q q
MIN
TYP 150
MAX 700 950 1100 1200 1350 1500
UNITS V V V V V V
250
q q
3
LT1490A ELECTRICAL CHARACTERISTICS
SYMBOL IOS IB en in RIN CIN CMRR AVOL PARAMETER Input Offset Voltage Drift (Note 9) 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 VCM = - 15V to 29V VO = 14V, RL = 10k 0C TA 70C - 40C TA 85C No Load IOUT = 5mA IOUT = 10mA Short to GND 0C TA 70C - 40C TA 85C VS = 1.25V to 22V
q q q q q q
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 15V unless otherwise noted. (Note 4)
CONDITIONS - 40C TA 85C
q q q
MIN
TYP 2 0.2 1 1 50 0.03
MAX 6 0.8 8
UNITS V/C nA nA VP-P nV/Hz pA/Hz M M pF
0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = - 15V to 14V 6
17 15000 4.6 29 98 250
- 15 80 100 75 50 14.9 14.5 14.5 20 15 10 88
V dB V/mV V/mV V/mV V V V mA mA mA dB
VO
Output Voltage Swing
14.978 14.750 14.670 25
ISC
Short-Circuit Current (Note 2)
q q q q
PSRR IS GBW
Power Supply Rejection Ratio Supply Current per Amplifier Gain Bandwidth Product
98 50 70 85
A A kHz kHz kHz V/s V/s V/s
f = 1kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = , VO = 10V, Measure at VO = 5V 0C TA 70C - 40C TA 85C
q q
125 110 100 0.0375
200
SR
Slew Rate
0.07
q q
0.0330 0.0300
Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. 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 LT1490AC and LT1490AI are guaranteed functional over the operating temperature range of - 40C to 85C. Note 4: The LT1490AC is guaranteed to meet specified performance from 0C to 70C. The LT1490AC is designed, characterized and expected to meet specified performance from - 40C to 85C but is not tested or QA sampled at these temperatures. The LT1490I is guaranteed to meet specified performance from -40C to 85C.
Note 5: ESD (Electrostatic Discharge) sensitive device. Extensive use of ESD protection devices are used internal to the LT1490A. However, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions. Note 6: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 15V tests. Note 7: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 15V tests. Note 8: Guaranteed by correlation to slew rate at VS = 15V and GBW at VS = 3V and VS = 15V tests. Note 9: This parameter is not 100% tested.
4
LT1490A TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
80 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 45 TA = 125C TA = 25C
CHANGE IN INPUT OFFSET VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER (A)
INPUT BIAS CURRENT (nA)
TA = -55C
Output Saturation Voltage vs Load Current (Output High)
1 VS = 5V, 0V 1
OUTPUT SATURATION VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (V)
OUTPUT SATURATION VOLTAGE (V)
TA = 125C
100m TA = 25C TA = -55C
10m
1
10 1m 10m 100 SOURCING LOAD CURRENT (A)
0.1Hz to 10Hz Noise Voltage
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
INPUT NOISE CURRENT DENSITY (pA/Hz)
VS = 2.5V
NOISE VOLTAGE (400nV/DIV)
0
1
2
3
456 TIME (SEC)
7
UW
1490A G01
1490A G04
Minimum Supply Voltage
400 300 200 100 0 -100 -200 -300 TA = 125C 0 1 3 4 2 TOTAL SUPPLY VOLTAGE (V) 5
1490A G02
Input Bias Current vs Common Mode Voltage
5000 VS = 5V, 0V 3000 1000 TA = -55C 30 20 10 0 -10 4.0 5.6 4.4 4.8 5.2 COMMON MODE VOLTAGE (V) 44
1490A G03
TA = 25C
TA = -55C
TA = 25C TA = 125C
- 400
Output Saturation Voltage vs Load Current (Output Low)
VS = 5V, 0V
Output Saturation Voltage vs Input Overdrive
100 VS = 5V, 0V 90 NO LOAD 80 70 60 50 40 30 20 10 0 0 10 OUTPUT LOW 30 40 20 INPUT OVERDRIVE (mV) 50
1490A G06
100m
TA = 125C TA = 25C
10m
TA = -55C
OUTPUT HIGH
100m
1m 0.1
1 10 100 1m 10m SINKING LOAD CURRENT (A)
100m
1490A G05
Noise Voltage Density vs Frequency
80
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0
Input Noise Current vs Frequency
70
60
50
40
8
9
10
30 1 10 100 FREQUENCY (Hz) 1k
1490A G08
1
10 100 FREQUENCY (Hz)
1k
1490A G09
1490A G07
5
LT1490A TYPICAL PERFOR A CE CHARACTERISTICS
Gain and Phase Shift vs Frequency
70 60 50 40 PHASE VS = 2.5V 100
GAIN BANDWIDTH PRODUCT (kHz)
GAIN (dB)
30 20 10 0 -10 -20 -30 1 10 100 FREQUENCY (kHz) GAIN
20 0 -20 - 40 - 60 - 80 -100 1000
1490A G10
200 180 VS = 1.5V 160 140 120 100 -50 -25
VS = 15V
SLEW RATE (V/s)
Gain Bandwidth Product and Phase Margin vs Supply Voltage
250
GAIN BANDWIDTH PRODUCT (kHz)
COMMON MODE REJECTION RATIO (dB)
240 230 220 210 200 190 180 170 160 150 0 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 45 RL = 10k f = 1kHz 10 20 GAIN BANDWIDTH 30 40 PHASE MARGIN 50
PHASE MARGIN (DEG)
POWER SUPPLY REJECTION RATIO (dB)
Gain Bandwidth Product and Phase Margin vs Load Resistance
350
GAIN BANDWIDTH PRODUCT (kHz)
CHANNEL SEPARATION (dB)
300 250 200 PHASE MARGIN
OUTPUT IMPEDANCE ()
VS = 2.5V AV = -1 RF = RG = 100k f = 1kHz
GAIN BANDWIDTH 150 100 50 1 10 LOAD RESISTANCE (k) 40 30 20 100
1490A G16
6
UW
1490A G13
Gain Bandwidth Product vs Temperature
260 f = 1kHz 240 220 0.10 0.12 80 60 40
Slew Rate vs Temperature
RISING, VS = 15V
PHASE SHIFT (DEG)
0.08
RISING, VS = 1.5V FALLING, VS = 15V FALLING, VS = 1.5V
0.06
50 25 0 75 TEMPERATURE (C)
100
125
0.04 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
1490A G11
1490A G12
CMRR vs Frequency
60
120 80 70 60
PSRR vs Frequency
VS = 2.5V
100
VS = 15V VS = 1.5V
POSITIVE SUPPLY 50 40 30 20 10 0 -10 -20 1 10 FREQUENCY (kHz) 100
1490A G15
80
60
NEGATIVE SUPPLY
40
20 1 10 FREQUENCY (kHz) 100
1490A G14
Channel Separation vs Frequency
80 70
Output Impedance vs Frequency
10k VS = 2.5V
130 120 110 100 90 80 70 60 50 40 0.1 1 10 FREQUENCY (kHz)
VS = 15V
1k AV = 100 100 AV = 10 10 AV = 1
PHASE MARGIN (DEG)
60 50
1
100
1490A G17
0.1 0.1
1 10 FREQUENCY (kHz)
100
1490A G18
LT1490A TYPICAL PERFOR A CE CHARACTERISTICS
Undistorted Output Swing vs Frequency
35 30
OUTPUT SWING (VP-P)
VS = 15V
DISTORTION 1%
OUTPUT STEP (V)
20 15 10 5 0 0.1 VS = 5V, 0V
2 0 -2 -4 -6 -8 -10 AV = 1 0 20 40 60 80 100 120 140 160 SETTLING TIME (s)
1490A F20
OVERSHOOT (%)
25
1 10 FREQUENCY (kHz)
Total Harmonic Distortion + Noise vs Frequency
10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 50k 10
1
THD + NOISE (%)
THD + NOISE (%)
THD + NOISE (%)
0.1
0.01
AV = -1 AV = 1
0.001 0.01
1 0.1 FREQUENCY (kHz)
Open-Loop Gain
CHANGE IN INPUT OFFSET VOLTAGE (100V/DIV) VS = 15V RL = 2k
RL = 10k
RL = 50k
-10V 0V 10V OUTPUT VOLTAGE (5V/DIV)
UW
1490A G19
1490A G22 1490A G25
Settling Time to 0.1% vs Output Step
10 8 6 4 VS = 15V AV = -1 AV = 1
100 90 80 70 60 50 40 30 20 10 0
Capacitive Load Handling, Overshoot vs Capacitive Load
VS = 5V, 0V ISOURCE = 170A
AV = 1
AV = 2
AV = 10 AV = 5
AV = -1
100
10
100 1000 CAPACITIVE LOAD (pF)
10000
1490A G21
Total Harmonic Distortion + Noise vs Load Resistance
VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz VS = 1.5V VIN = 1V VS = 3V, 0V VIN = 0.5V TO 2.5V 0.01 VS = 3V, 0V VIN = 0.2V TO 2.2V
Total Harmonic Distortion + Noise vs Output Voltage
10 RL = 10k VCM = HALF SUPPLY f = 1kHz 1 AV = -1 VS = 1.5V AV = 1 VS = 1.5V
1
0.1
0.1
0.01 AV = 1 VS = 3V, 0V 0.001
10 1 LOAD RESISTANCE TO GROUND (k) 100
AV = -1 VS = 3V, 0V
10
0.001 0.1
0
1 2 OUTPUT VOLTAGE (VP-P)
3
1490A G24
1490A G23
Large-Signal Response
Small-Signal Response
VS = 15V AV = -1
1490A G26
VS = 15V AV = 1
1490A G27
7
LT1490A
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1490A should be bypassed with a small capacitor (about 0.01F) 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 LT1490A is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is less than 1nA. The LT1490A can be shut down by removing V +. In this condition the input bias current is typically less than 0.5nA, even if the inputs are 44V above the negative supply. When operating the LT1490A on total supplies of 20V or more, the supply must not rise to its final voltage in less than 1s. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. A resistance of 7.5 in the supply or in the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1490A has 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 - 1nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 25nA. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN 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 of the NPN input stage allows the LT1490A to operate 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 3A at room temperature. The input offset voltage is typically 700V when operating above V +. The LT1490A will operate with its inputs 44V above V - regardless of V +.
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The inputs are protected against excursions as much as 15V below V - by an internal 1k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 15V below V -. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the LT1490A is affected by input overdrive as shown in the typical performance curves. The output of the LT1490A can be pulled up to 18V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. The normally reverse-biased substrate diode from the output to V - will cause unlimited currents to flow when the output is forced below V -. If the current is transient and limited to 100mA, no damage will occur. The LT1490A is 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 10,000pF, at all output currents. 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 nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1490A 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 LT1490A 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.
W
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LT1490A
APPLICATIO S I FOR ATIO
Gain
The open-loop gain is almost independent of load when the output is sourcing current. This optimizes performance
TYPICAL APPLICATIO S
Square Wave Oscillator
5V 100k 59k
+
100k 1/2 LT1490A VOUT
-
R 50k C 0.1F
1490A TA02
f= 1 2RC VOUT = 5VP-P WITH 5V SUPPLY IS = 200A AT VS = 5V, R = 50k, C = 1nF OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
SI PLIFIED SCHE ATIC
V+ Q1 D1 R1 30k Q4 - IN Q17 Q20 OUT Q16 Q15 Q9 Q10 Q13 Q14 Q21 Q18 R3 1k 2A +IN Q7 Q8 Q11 Q12 R2 1k D2 Q2 D3 Q3 Q22
+
Q5
Q6
D4
D5
ONE AMPLIFIER
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in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details.
Optional Output Compensation for Capacitive Loads Greater Than 200pF
VIN
W
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+
1/2 LT1490A
-
CL 10,000pF
0.22F 150
1490A TA04
W
Q19
R4 40k
R5 40k V-
1490A SS
9
LT1490A
PACKAGE DESCRIPTIO
0.007 (0.18) 0.021 0.006 (0.53 0.015)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.102)
8
76
5
0.193 0.006 (4.90 0.15)
0.118 0.004** (3.00 0.102)
1 0.040 0.006 (1.02 0.15) 0 - 6 TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) BSC
23
4 0.034 0.004 (0.86 0.102)
0.006 0.004 (0.15 0.102)
MSOP (MS8) 1098
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076)
N8 1098
0.100 (2.54) BSC
LT1490A
PACKAGE DESCRIPTIO
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.014 - 0.019 (0.355 - 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.016 - 0.050 (0.406 - 1.270)
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.
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Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.050 (1.270) BSC
SO8 1298
11
LT1490A
TYPICAL APPLICATIO
R2 47k R3 10k C2 0.47F 3 R5 100k
5
+
1/2 LT1490A 7
+
1
D1 1N4148
R1 1/2 LT1490A 33k 2
6
-
-
C1 1F
R4 1.6M
R8 620k 20Hz OSCILLATOR
CADENCE OSCILLATOR
*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
RELATED PARTS
PART NUMBER LT1078/LT1079 LT2078/LT2079 LT1178/LT1179 LT2178/LT2179 LT1366/LT1367 LT1636 LT1638/LT1639 LT1782 LT1783 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 Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp 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 55A Supply Current, VCM Extends 44V above VEE, Independent of VCC, MSOP Package, Shutdown Function 0.4V/s Slew Rate, 230A Supply Current per Amplifier SOT-23, 800V VOS(MAX), IS =55A (Max), Gain-Bandwidth = 200kHz, Shutdown Pin SOT-23, 800V VOS(MAX), IS =300A (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
Ring-Tone Generator
60V R16 100k Q1 IRF628 C3 0.047F R9 300k R11 10k 10 Z1 15V 100k 8 13 4 14 C7 47F R18 100 R23 4.7k R25 4.7k R26 2k OPTO1* Q5 2N3904 R6 10k Q3 2N3904 R17 620
+
1/2 LT1490A
R7 16k
C4 0.068F
9
-
12 R14 10k R15 47k
- +
1/2 LT1490A R24 11 420
R10 620k
R12 SMOOTHING FILTER 10k C5 0.01F R13 130k
Z2 15V Q2 IRF9620 POWER AMPLIFIER -180V R20 100k
R19 620
UP TO LOAD TEN PHONES Q4 2N3906 R21 150 C6 0.033F
1490A TA03
1490af LT/TP 0300 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 2000

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