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LT1490/LT1491 Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps
FEATURES
s s s s s s s s s s s s
DESCRIPTION
The dual LT (R)1490 and quad LT1491 op amps operate on all single and split supplies with a total voltage of 2V to 44V drawing only 40A of quiescent current per amplifier. These amplifiers are reverse supply protected; they draw no current for reverse supply up to 18V. The input range of the LT1490/ LT1491 includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490/ LT1491 can drive heavy loads; their rail-to-rail outputs drive 20mA. The LT1490/LT1491 are unity-gain stable and drive all capacitive loads up to 10,000pF when optional 0.22F and 150 compensation is used. The LT1490/LT1491 have 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 22V. There is no phase reversal of the output for inputs 22V below V - or 44V above V -, independent of V +. The LT1490 dual op amp is available in the 8-pin SO and PDIP packages. The quad LT1491 is available in the 14-pin SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Rail-to-Rail Input and Output Single Supply Input Range: - 0.4V to 44V Micropower: 50A/Amplifier Max 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
APPLICATIONS
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Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring Micropower Active Filters 4mA to 20mA Transmitters
TYPICAL APPLICATION
CHARGER VOLTAGE RS 0.2 IBATT RA 2k RA' 2k
Battery Monitor
Q1 2N3904
+ -
A 1/4 LT1491
-
C 1/4 LT1491
+
RB 2k RB' 2k LOAD
+ -
Q2 2N3904
B 1/4 LT1491
LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING
+
VBATT = 12V S1
RG 10k 10k
D 1/4 LT1491
+
-
90.9k
IBATT =
VOUT V = OUT AMPS (RS)(RG /RA)(GAIN) GAIN
S1 = OPEN, GAIN = 1 S1 = CLOSED, GAIN = 10
R A = RB VS = 5V, 0V
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LOGIC
VOUT
1490/91 TA01
1
LT1490/LT1491
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V -) .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... 25mA Output Short-Circuit Duration (Note 1) ......... Continuous Operating Temperature Range ................ - 40C to 85C Junction Temperature ........................................... 150C Specified Temperature Range (Note 2) .. - 40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
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
ORDER PART NUMBER LT1490CMS8 LT1490CN8 LT1490CS8 MS8 PART MARKING LTBB S8 PART MARKING 1490
MS8 PACKAGE N8 PACKAGE 8-LEAD MSOP 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 250C/ W (MS8) TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, TA = 25C, unless otherwise noted. (Note 2)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT1490 N Package 0C TA 70C - 40C TA 85C LT1490 S Package 0C TA 70C - 40C TA 85C LT1491 N Package 0C TA 70C - 40C TA 85C LT1490CMS8 Package, LT1491 S Package 0C TA 70C - 40C TA 85C 0C TA 70C (Note 6) VCM = 44V (Note 3) IB Input Bias Current VCM = 44V (Note 3) VS = 0V en in Input Noise Voltage Input Noise Voltage Density Input Noise Current Density 0.1Hz to 10Hz f = 1kHz f = 1kHz MIN
q q
IOS
Input Offset Voltage Drift Input Offset Current
2
U
U
W
WW U
W
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
ORDER PART NUMBER LT1491CN LT1491CS
N PACKAGE S PACKAGE 14-LEAD PDIP 14-LEAD PLASTIC SO TJMAX = 150C, JA = 110C/ W (N) TJMAX = 150C, JA = 150C/ W (S)
TYP 220
220
q q
300
q q
350
q q q q q q q
MAX 800 1000 1100 950 1200 1300 1100 1350 1450 1450 1650 1750 4 0.8 0.8 8 10
UNITS V V V V V V V V V V V V V/C nA A nA A nA VP-P nV/Hz pA/Hz
2 0.2 4 4 0.1 1 50 0.03
LT1490/LT1491 ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, TA = 25C, unless otherwise noted. (Note 2)
SYMBOL RIN CIN CMRR AVOL PARAMETER Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 3) Large-Signal Voltage Gain
q
CONDITIONS Differential Common Mode, VCM = 0V to 44V
MIN 6 4 0 84 80 200 133 100 400 250 200
TYP 17 11 4.6 98 98 1500
MAX
UNITS M M pF V dB dB V/mV V/mV V/mV V/mV V/mV V/mV mV mV mV mV mV V V V V mA mA mA mA dB V V A A kHz kHz kHz V/s V/s V/s
44
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 VS = 3V, No Load VS = 3V, ISINK = 5mA VS = 5V, No Load VS = 5V, ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA VS = 3V, Short to GND VS = 3V, Short to VCC VS = 5V, Short to GND VS = 5V, Short to VCC VS = 2.5V to 12.5V, VCM = VO = 1V IS = - 100A per Amplifier
q q q q q q q q q q q q q q
1500
VOL
Output Voltage Swing Low
VOH
Output Voltage Swing High
ISC
Short-Circuit Current (Note 1)
PSRR
Power Supply Rejection Ratio Minimum Operating Supply Voltage Reverse Supply Voltage Supply Current per Amplifier (Note 4) Gain Bandwidth Product (Note 3) Slew Rate (Note 5)
q q q q
2.95 2.55 4.95 4.30 10 10 15 15 84 18
22 250 22 250 330 2.978 2.6 4.978 4.6 15 30 25 30 98 2 27 40 180
50 450 50 500 500
2.5 50 55
IS GBW
f = 1kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = 0C TA 70C - 40C TA 85C
q q q q
110 100 90 0.035 0.031 0.030
SR
0.06
VS = 15V, VCM = 0V, VOUT = 0V, TA = 25C, unless otherwise noted. (Note 2)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT1490 N, S Package 0C TA 70C - 40C TA 85C LT1491 N Package 0C TA 70C - 40C TA 85C LT1490CMS8 Package, LT1491 S Package 0C TA 70C - 40C TA 85C MIN
q q
TYP 250
MAX 1200 1400 1500 1250 1500 1600 1600 1850 1950
UNITS V V V V V V V V V
350
q q
400
q q
3
LT1490/LT1491 ELECTRICAL CHARACTERISTICS
SYMBOL IOS IB en in RIN CIN CMRR AVOL PARAMETER Input Offset Voltage Drift 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
VS = 15V, VCM = 0V, VOUT = 0V, TA = 25C, unless otherwise noted. (Note 2)
CONDITIONS 0C TA 70C (Note 6)
q q q
MIN
TYP 3 0.2 4 1 50 0.03 17 15000 4.6
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
- 15 80 100 75 50 14.9 14.5 14.5 20 15 10 88 98 250
29
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 1)
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
The q denotes specifications which apply over the full operating temperature range. Note 1: 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 2: The LT1490/LT1491 are designed, characterized and expected to meet these extended temperature limits, but are not tested at - 40C and 85C. Guaranteed I grade parts are available, consult factory.
Note 3: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 15V tests. Note 4: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 15V tests. Note 5: Guaranteed by correlation to slew rate at VS = 15V and GBW at VS = 3V and VS = 15V tests. Note 6: This parameter is not 100% tested.
4
LT1490/LT1491 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
80
CHANGE IN INPUT OFFSET VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER (A)
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
200 100 0 -100 -200 -300 TA = 125C 0 1 3 4 2 TOTAL SUPPLY VOLTAGE (V) 5
1490/91 G02
INPUT BIAS CURRENT (nA)
TA = -55C
Output Saturation Voltage vs Load Current (Output High)
1
OUTPUT SATURATION VOLTAGE (V)
OUTPUT SATURATION VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (V)
VS = 2.5V VOD = 30mV
TA = 125C 0.1 TA = 25C
TA = - 55C
0.01 0.001
0.01 0.1 1 SOURCING LOAD CURRENT (mA)
0.1Hz to 10Hz Noise Voltage
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
VS = 2.5V
80
INPUT NOISE CURRENT DENSITY (pA/Hz)
NOISE VOLTAGE (400nV/DIV)
0
1
2
3
456 TIME (SEC)
7
UW
1490/91 G01
Minimum Supply Voltage
400 300 6000 4000 2000
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V
TA = 25C
TA = -55C
30 20 10 0 -10 4.0
TA = -55C
TA = 25C TA = 125C 4.4 5.2 5.6 4.8 COMMON MODE VOLTAGE (V) 44
1490/91 G03
- 400
Output Saturation Voltage vs Load Current (Output Low)
1 VS = 2.5V VOD = 30mV
Output Saturation Voltage vs Input Overdrive
100 90 80 70 60 50 40 30 20 10 0 0 OUTPUT LOW 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
1490/91 G06
VS = 2.5V NO LOAD
TA = 125C 0.1 TA = 25C
TA = - 55C
OUTPUT HIGH
10
0.01 0.001
0.01 0.1 1 SINKING LOAD CURRENT (mA)
10
1490/90 G05
1490/90 G04
Noise Voltage Density vs Frequency
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 1 10 100 FREQUENCY (Hz) 1k
1490/91 G08
Input Noise Current vs Frequency
70
60
50
40
30
8
9
10
1
10 100 FREQUENCY (Hz)
1k
1490/91 G09
1490 G07
5
LT1490/LT1491 TYPICAL PERFORMANCE CHARACTERISTICS
Gain and Phase Shift vs Frequency
70 60 50 40
GAIN (dB)
GAIN BANDWIDTH PRODUCT (kHz)
PHASE
30 20 10 0 -10 -20 -30 1 10 100 FREQUENCY (kHz) GAIN
20 0 -20 - 40 - 60 - 80 -100 1000
1490/91 G10
200 180 VS = 3V 160 140 120 100 -50 -25
VS = 15V
SLEW RATE (V/s)
Gain Bandwidth Product and Phase Margin vs Supply Voltage
250 60
COMMON MODE REJECTION RATIO (dB)
GAIN BANDWIDTH PRODUCT (kHz)
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
POWER SUPPLY REJECTION RATIO (dB)
Gain Bandwith 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
6
UW
VS = 2.5V
1490/91 G13
Gain Bandwith Product vs Temperature
100 80 60 40
PHASE SHIFT (DEG)
Slew Rate vs Temperature
0.12
260 f = 1kHz 240 220
0.10
RISING, VS = 15V
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
1490/91 G11
1490/91 G12
CMRR vs Frequency
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
1490/91 G15
PHASE MARGIN (DEG)
PHASE MARGIN (DEG)
80
60
NEGATIVE SUPPLY
40
20 1 10 FREQUENCY (kHz) 100
1490 G14
Channel Separation vs Frequency
80 70 60 50
Output Impedance vs Frequency
10k VS = 2.5V
130 120 110 100 90 80 70 60 50
VS = 15V
1k AV = 100 100 AV = 10 10 AV = 1
1
20 100
1490/91 G16
40 0.1
1 10 FREQUENCY (kHz)
100
1490/91 G17
0.1 0.1
1 10 FREQUENCY (kHz)
100
1490/91 G18
LT1490/LT1491 TYPICAL PERFORMANCE CHARACTERISTICS
Undistorted Output Swing vs Frequency
35 30
OUTPUT SWING (VP-P)
VS = 15V
DISTORTION 1%
OUTPUT STEP (V)
25 20 15 10 5 0 0.1 VS = 2.5V
2 0 -2 -4 -6 -8 -10 AV = 1 0 20 40 60 80 100 120 140 160 SETTLING TIME (s)
1490/91 F20
OVERSHOOT (%)
1 10 FREQUENCY (kHz)
Total Harmonic Distortion + Noise vs Frequency
10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 50k
THD + NOISE (%)
1
THD + NOISE (%)
THD + NOISE (%)
0.1
0.01
AV = -1 AV = 1
0.001 0.01
0.1 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
1490/91 G19 1490/91 G22 1490/91 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
1490/91 G21
Total Harmonic Distortion + Noise vs Load Resistance
10 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
1 10 LOAD RESISTANCE TO GROUND (k) 100
AV = -1 VS = 3V, 0V
10
0.001 0.1
0
1 2 OUTPUT VOLTAGE (VP-P)
3
1490/91 G24
1490/91 G23
Large-Signal Response
Small-Signal Response
VS = 15V AV = -1
1490/91 G26
VS = 15V AV = 1
1490/91 G27
7
LT1490/LT1491
APPLICATIONS INFORMATION
Supply Voltage The positive supply pin of the LT1490/LT1491 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 LT1490/LT1491 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 LT1490/LT1491 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. When operating the LT1490/LT1491 on total supplies of 30V or more, the supply must not be brought up faster 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. 5 of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1490/LT1491 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 - 4nA. 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 18nA. 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 LT1490/LT1491 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 4A at room temperature. The input offset voltage is typically 700V when operating above V +. The LT1490/LT1491 will operate with its inputs 44V above V - regardless of V +. The inputs are protected against excursions as much as 22V 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 22V 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 LT1490/LT1491 is affected by input overdrive as shown in the typical performance curves. When monitoring voltages within 100mV of either rail, gain should be taken to keep the output from clipping. The output of the LT1490/LT1491 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 LT1490/LT1491 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 LT1490 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 LT1490/LT1491 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.
8
U
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U
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LT1490/LT1491
APPLICATIONS INFORMATION
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 photo of Open-Loop Gain for various loads shows the details.
TYPICAL APPLICATIONS
Square Wave Oscillator
5V 100k 59k
+
100k 1/2 LT1490 VOUT
-
R 50k C 0.1F
1490/91 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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W
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W
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Optional Output Compensation for Capacitive Loads Greater Than 200pF
VIN
+
1/2 LT1490
-
CL 10,000pF
0.22F 150
1490/91 TA04
W
Q19
R4 40k
R5 40k V-
1490/91 SS
9
LT1490/LT1491
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
MS Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.040 0.006 (1.02 0.15) 0.007 (0.18) 0.021 0.004 (0.53 0.01) 0 - 6 TYP 0.192 0.004 (4.88 0.10) 0.025 (0.65) TYP 1 23 4
MSOP08 0595
* 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)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.125 (3.175) MIN 0.015 (0.380) MIN
0.018 0.003 0.100 0.010 (0.457 0.076) (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(
+0.025 0.325 -0.015 +0.635 8.255 -0.381
)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254)
0.053 - 0.069 (1.346 - 1.752) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270
*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
10
U
0.006 0.004 (0.15 0.10)
0.118 0.004* (3.00 0.10)
8
76
5
0.012 (0.30)
0.118 0.004** (3.00 0.10)
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.130 0.005 (3.302 0.127) 0.400* (10.160) MAX 8 7 6 5
0.045 - 0.065 (1.143 - 1.651)
0.255 0.015* (6.477 0.381)
1
2
3
4
N8 0695
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 0.004 - 0.010 (0.101 - 0.254) 8 7 6 5
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
SO8 0695
1
2
3
4
LT1490/LT1491
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N Package 14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 14 13 12 11 10 9 8
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381) 0.005 (0.125) MIN 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) +0.025 0.325 -0.015 +0.635 8.255 -0.381
(
)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254)
0 - 8 TYP
0.016 - 0.050 0.406 - 1.270
*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
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
0.255 0.015* (6.477 0.381)
1 0.130 0.005 (3.302 0.127) 0.015 (0.380) MIN
2
3
4
5
6
7
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N14 0695
S Package 14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 - 0.344* (8.560 - 8.738) 14 13 12 11 10 9 8
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
5
6
7
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
S14 0695
11
LT1490/LT1491
TYPICAL APPLICATION
Ring-Tone Generator
60V R2 47k R3 10k C2 0.47F 3 R5 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 R16 100k
5
+
1/4 LT1491 7
+
1
D1 1N4148
R1 1/4 LT1491 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 OFF HOOK DETECTION
RELATED PARTS
PART NUMBER
LT1078/LT1079 LTC1152
DESCRIPTION
Dual/Quad 55A Max, Single Supply, Precision Op Amps Rail-to-Rail Input, Rail-to-Rail Output, Zero-Drift Amplifier
LT1178/LT1179 LT1366/LT1367
Dual/Quad 17A Max, Single Supply, Precison Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
C-Load is a trademark of Linear Technology Corporation.
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
U
R6 10k
Q3 2N3904 R17 620
+
1/4 LT1491
R7 16k
C4 0.068F
9
-
12 R14 10k R15 47k
- +
1/4 LT1491 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
1490/1491 TA03
COMMENTS
Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 2.5V/C Drift (Max), 200kHz GBW, 0.07V/s Slew Rate High DC Accuracy, 10V VOS(MAX), 100nV/C, 1MHz GBW, 1V/s Slew Rate, Supply Current 2.2mA (Max), Single Supply, Can Be Configured for C-LoadTM Operation 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
14901fa LT/TP 0897 4K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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