LT1490AIN8 [Linear]
Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp; 双过顶的微功耗轨至轨输入和输出运算放大器
| 型号： | LT1490AIN8 |
| 厂家： | 
Linear |
| 描述： | Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp |
| 文件： | 总12页 (文件大小：205K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1490A
Dual Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amp
U
FEATURES
DESCRIPTIO
TheLT®1490AisanenhancedversionofthepopularLT1490
op amp with improved input offset voltage (500µV max) and
output voltage swing (10mV max from V–). It is recom-
mended for all new designs. The LT1490A operates on all
single and split supplies with a total voltage of 2V to 44V,
drawing only 40µA 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 sup-
plies. 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 0.22µF and 150Ω compensa-
tion is used.
■
Low Input Offset Voltage: 500µV Max
Output Swings to 10mV Max from V–
Rail-to-Rail Input and Output
Micropower: 50µA/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
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+.
U
APPLICATIO S
■
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
■
Supply Current Sensing
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.
■
Battery Monitoring
■
Micropower Active Filters
■
4mA to 20mA Transmitters
U
TYPICAL APPLICATIO
Battery Monitor
R
R
S
A
0.2Ω
2k
Q1
2N3904
CHARGER
VOLTAGE
+
R
I
A
´
1/2 LT1490A
BATT
–
2k
1/2 LT1490A
LOGIC
–
+
R
B
Q2
2N3904
2k
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
R
B
´
1/2 LT1490A
2k
–
LOAD
+
+
R
G
1/2 LT1490A
V
OUT
10k
V
BATT
= 12V
–
S1
10k
90.9k
14901A TA01
V
V
=
OUT
OUT
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
= R
A
S
B
I
=
AMPS
BATT
(R )(R /R )(GAIN) GAIN
V
= 5V, 0V
S
G
A
1
LT1490A
W W U W
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.......................................... 150°C
Operating Temperature Range
(Note 3) ............................................. –40°C to 85°C
Specified Temperature Range (Note 4) .. –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
U
W U
PACKAGE/ORDER INFORMATION
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NUMBER
+
TOP VIEW
1
2
3
4
8
7
6
5
OUT A
–IN A
+IN A
V
LT1490ACMS8
LT1490AIMS8
LT1490ACN8
LT1490ACS8
LT1490AIN8
LT1490AIS8
+
OUT A
–IN A
+IN A
1
2
3
4
8 V
OUT B
–IN B
+IN B
7 OUT B
6 –IN B
5 +IN B
A
–
B
V
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 150°C, θJA = 250°C/ W
LTNG
LTPU
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
1490A
1490AI
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 5)
N8, S8 Package
110
500
700
800
µV
µV
µV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
MS8 Package
220
1000
1200
1400
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift (Note 9)
Input Offset Current
–40°C ≤ T ≤ 85°C
●
2
4
µV/°C
A
I
I
●
●
0.2
0.8
0.8
nA
µA
OS
V
V
= 44V (Note 6)
= 44V (Note 6)
CM
Input Bias Current
●
●
1
3
0.3
8
10
nA
µA
nA
B
CM
V = 0V
S
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
1
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.03
n
R
IN
Differential
Common Mode, V = 0V to 44V
6
4
17
11
MΩ
MΩ
CM
2
LT1490A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
pF
C
IN
Input Capacitance
Input Voltage Range
4.6
●
0
44
V
CMRR
Common Mode Rejection Ratio
(Note 6)
V
CM
V
CM
= 0V to V – 1V
●
●
84
80
98
98
dB
dB
CC
= 0V to 44V
A
VOL
Large-Signal Voltage Gain
V = 3V, V = 500mV to 2.5V, R = 10k
200
133
100
1500
V/mV
V/mV
V/mV
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, V = 500mV to 4.5V, R = 10k
400
250
200
1500
V/mV
V/mV
V/mV
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
Output Voltage Swing Low
V = 3V, No Load
●
●
3
10
mV
mV
OL
S
V = 3V, I
= 5mA
250
450
S
SINK
V = 5V, No Load
●
●
3
250
330
10
500
500
mV
mV
mV
S
V = 5V, I
= 5mA
= 10mA
S
SINK
SINK
V = 5V, I
S
Output Voltage Swing High
V = 3V, No Load
●
●
2.95
2.55
2.978
2.6
V
V
OH
S
V = 3V, I
= 5mA
S
SOURCE
V = 5V, No Load
●
●
4.95
4.30
4.978
4.6
V
V
S
V = 5V, I
= 10mA
S
SOURCE
I
Short-Circuit Current (Note 2)
V = 3V, Short to GND
10
10
15
30
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
15
15
25
30
mA
mA
S
V = 5V, Short to V
S
CC
PSRR
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Reverse Supply Voltage
V = 2.5V to 12.5V, V = V = 1V
●
●
●
84
98
2
dB
V
S
CM
O
2.5
I = –100µA per Amplifier
S
18
27
40
V
I
Supply Current per Amplifier
(Note 7)
50
55
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
(Note 6)
f = 1kHz
110
100
90
180
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Slew Rate
(Note 8)
A = –1, R = ∞
0.035
0.031
0.030
0.06
V/µs
V/µs
V/µs
V
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VS = ±15V unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 5)
N8, S8 Package
150
700
950
1100
µV
µV
µV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
MS8 Package
250
1200
1350
1500
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
3
LT1490A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VS = ±15V unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
2
MAX
6
UNITS
µV/°C
nA
Input Offset Voltage Drift (Note 9)
Input Offset Current
–40°C ≤ T ≤ 85°C
●
●
●
A
I
I
0.2
1
0.8
8
OS
B
Input Bias Current
nA
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
1
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
0.03
nV/√Hz
pA/√Hz
n
i
f = 1kHz
n
R
IN
Differential
Common Mode, V = –15V to 14V
6
17
15000
MΩ
MΩ
CM
C
Input Capacitance
4.6
pF
V
IN
Input Voltage Range
●
●
–15
80
29
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 29V
98
dB
CM
A
V = ±14V, R = 10k
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
100
75
50
250
V/mV
V/mV
V/mV
VOL
O
L
●
●
A
A
V
Output Voltage Swing
No Load
●
●
±14.9
±14.5
±14.5
±14.978
±14.750
±14.670
V
V
V
O
I
I
= ±5mA
= ±10mA
OUT
OUT
I
Short-Circuit Current (Note 2)
Short to GND
0°C ≤ T ≤ 70°C
±20
±15
±10
±25
mA
mA
mA
SC
●
●
A
–40°C ≤ T ≤ 85°C
A
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = ±1.25V to ±22V
S
●
88
98
50
dB
I
70
85
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
125
110
100
200
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
A = –1, R = ∞, V = ±10V,
0.0375
0.07
V/µs
V
L
O
Measure at V = ±5V
O
0°C ≤ T ≤ 70°C
●
●
0.0330
0.0300
V/µs
V/µs
A
–40°C ≤ T ≤ 85°C
A
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 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: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
V = ±15V tests.
S
Note 3: The LT1490AC and LT1490AI are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 7: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
V = ±15V tests.
S
Note 4: The LT1490AC is guaranteed to meet specified performance from
0°C to 70°C. The LT1490AC is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1490I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 8: Guaranteed by correlation to slew rate at V = ±15V and GBW
S
at V = 3V and V = ±15V tests.
S
S
Note 9: This parameter is not 100% tested.
4
LT1490A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current
vs Common Mode Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
80
70
60
50
40
30
20
10
0
5000
3000
1000
400
300
V
= 5V, 0V
S
T
= 125°C
A
T
200
100
= 25°C
A
T
= –55°C
T
A
= –55°C
= 25°C
A
T
= 25°C
A
30
20
0
T
T
A
= –55°C
A
–100
T
= 125°C
A
10
–200
–300
0
T
= 125°C
A
–10
–400
0
5
10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
4.0
4.4
4.8
5.2
5.6
44
0
1
2
3
4
5
COMMON MODE VOLTAGE (V)
TOTAL SUPPLY VOLTAGE (V)
1490A G01
1490A G03
1490A G02
Output Saturation Voltage
vs Load Current (Output High)
Output Saturation Voltage
vs Input Overdrive
Output Saturation Voltage
vs Load Current (Output Low)
1
100m
10m
1m
1
100
90
80
70
60
50
40
30
20
10
0
V
= 5V, 0V
V
= 5V, 0V
V = 5V, 0V
S
S
S
NO LOAD
T
= 125°C
A
T
= 125°C
A
T
= 25°C
A
100m
T
= 25°C
A
T
= –55°C
A
OUTPUT HIGH
OUTPUT LOW
T
= –55°C
A
10m
1µ
10µ
100µ
1m
10m
100m
0
10
30
INPUT OVERDRIVE (mV)
40
50
0.1µ
1µ
10µ 100µ 1m
10m 100m
20
SINKING LOAD CURRENT (A)
SOURCING LOAD CURRENT (A)
1490A G04
1490A G06
1490A G05
Noise Voltage Density
vs Frequency
0.1Hz to 10Hz Noise Voltage
Input Noise Current vs Frequency
80
70
60
50
40
30
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
V
= ±2.5V
S
0
1
2
3
4
5
6
7
8
9
10
1
10
100
1k
1
10
100
1k
TIME (SEC)
FREQUENCY (Hz)
FREQUENCY (Hz)
1490A G09
1490A G08
1490A G07
5
LT1490A
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Gain and Phase Shift
vs Frequency
Gain Bandwidth Product
vs Temperature
Slew Rate vs Temperature
0.12
0.10
0.08
0.06
0.04
260
240
220
200
180
160
140
120
100
70
60
50
40
100
80
V
= ±2.5V
f = 1kHz
S
RISING, V = ±15V
S
60
PHASE
40
30
20
20
0
V
S
= ±15V
RISING, V = ±1.5V
S
FALLING, V = ±15V
GAIN
V
= ±1.5V
S
S
10
0
–20
–40
–60
–80
–100
FALLING, V = ±1.5V
S
–10
–20
–30
50
75 100 125
–50
0
25
50
75 100 125
–50
0
25
–25
–25
1
10
100
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (kHz)
1490A G10
1490A G11
1490A G12
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
CMRR vs Frequency
PSRR vs Frequency
250
240
230
220
210
200
190
180
170
160
150
60
50
40
30
20
10
120
80
70
V
= ±2.5V
S
PHASE MARGIN
100
80
60
40
20
60
50
V
= ±15V
POSITIVE SUPPLY
S
40
V
= ±1.5V
S
30
GAIN BANDWIDTH
20
NEGATIVE SUPPLY
10
0
R
= 10k
L
–10
–20
f = 1kHz
0
5
10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
1
10
100
1
10
FREQUENCY (kHz)
100
FREQUENCY (kHz)
1490A G14
1490A G15
1490A G13
Gain Bandwidth Product and
Phase Margin vs Load Resistance
Channel Separation vs Frequency
Output Impedance vs Frequency
350
300
250
200
150
100
50
80
10k
1k
130
120
110
100
90
V
= ±2.5V
V
A
= ±2.5V
V
S
= ±15V
S
S
V
F
= –1
R = R = 100k 70
G
f = 1kHz
A
A
= 100
= 10
V
V
PHASE MARGIN
60
50
40
30
20
100
10
80
GAIN BANDWIDTH
70
A
= 1
V
60
1
50
0.1
40
1
10
LOAD RESISTANCE (kΩ)
100
0.1
1
10
100
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
1490A G16
1490A G17
1490A G18
6
LT1490A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Undistorted Output Swing
vs Frequency
Settling Time to 0.1%
vs Output Step
Capacitive Load Handling,
Overshoot vs Capacitive Load
10
8
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
V
S
= ±15V
V = 5V, 0V
S
DISTORTION ≤1%
V
= ±15V
S
I
= 170µA
SOURCE
A
= –1
V
6
A
V
= 1
4
2
0
A
V
= 10
–2
–4
–6
–8
–10
A
V
= 1
A
V
= 2
A
V
= 5
V
= 5V, 0V
A = –1
V
S
A
V
= 1
0
0
80
120 140
160
10
100
1000
10000
20 40 60
100
0.1
1
10
100
SETTLING TIME (µs)
CAPACITIVE LOAD (pF)
FREQUENCY (kHz)
1490A G21
1490A G19
1490A F20
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage
10
1
10
1
10
1
V
V
V
= 3V, 0V
= 2V
CM
= 50k
V
A
V
= 3V TOTAL
= 1
R
V
= 10k
CM
f = 1kHz
S
OUT
S
V
L
= HALF SUPPLY
P-P
= 1.2V
= 2V AT 1kHz
IN
P-P
R
L
V
V
= ±1.5V
= ±1V
S
IN
A
V
= 1
= ±1.5V
V
S
A
S
= –1
V
V
= ±1.5V
0.1
0.1
0.1
V
V
= 3V, 0V
IN
S
= 0.5V TO 2.5V
A
S
= –1
0.01
0.01
0.01
0.001
V
A
= –1
V
V
= 3V, 0V
A
= 1
V
V
V
= 3V, 0V
IN
S
A
= 1
V
V
= 3V, 0V
S
= 0.2V TO 2.2V
0.001
0.001
0
1
2
3
0.01
0.1
1
10
0.1
1
10
100
OUTPUT VOLTAGE (V
)
P-P
FREQUENCY (kHz)
LOAD RESISTANCE TO GROUND (kΩ)
1490A G24
1490A G22
1490A G23
Open-Loop Gain
Large-Signal Response
Small-Signal Response
VS = ±15V
RL = 2k
R
= 10k
L
RL = 50k
1490A G27
1490A G25
1490A G26
VS = ±15V
AV = –1
V
S = ±15V
–10V
0V
10V
AV = 1
OUTPUT VOLTAGE (5V/DIV)
7
LT1490A
W U U
U
APPLICATIO S I FOR ATIO
Supply Voltage
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
15VbelowV–. Therearenoclampingdiodesbetweenthe
inputsandthemaximumdifferentialinputvoltageis44V.
The positive supply pin of the LT1490A should be by-
passed with a small capacitor (about 0.01µF) within an
inch of the pin. When driving heavy loads an additional
4.7µF electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
TheLT1490Aisprotectedagainstreversebatteryvoltages
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
conditiontheinputbiascurrentistypicallylessthan0.5nA,
even if the inputs are 44V above the negative supply.
Output
The output voltage swing of the LT1490A is affected by
input overdrive as shown in the typical performance
curves.
TheoutputoftheLT1490Acanbepulledupto18Vbeyond
V+ with less than 1nA of leakage current, provided that V+
is less than 0.5V.
When operating the LT1490A on total supplies of 20V or
more, the supply must not rise to its final voltage in less
than 1µs. This is especially true if low ESR bypass capaci-
tors are used. A series RLC circuit is formed from the
supply lead inductance and the bypass capacitor. A resis-
tance of 7.5Ω in the supply or in the bypass capacitor will
dampen the tuned circuit enough to limit the rise time.
The normally reverse-biased substrate diode from the
outputtoV– willcauseunlimitedcurrentstoflowwhenthe
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 condi-
tions. A 0.22µF capacitor in series with a 150Ω resistor
between the output and ground will compensate these
amplifiersforlargercapacitiveloads, upto10,000pF, atall
output currents.
Inputs
The LT1490A has two input stages, NPN and PNP (see the
Simplified Schematic), resulting in three distinct operat-
ingregionsasshownintheInputBiasCurrentvsCommon
Mode typical performance curve.
Distortion
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
PNPstagetotheNPNstagetomovetowardsV+. Theinput
offset voltage of the NPN stage is untrimmed and is
typically 600µV.
Therearetwomaincontributorsofdistortioninopamps:
output crossover distortion as the output transitions
from sourcing to sinking current and distortion caused
bynonlinearcommonmoderejection.Ofcourse,iftheop
amp is operating inverting there is no common mode
induced distortion. When the LT1490A switches be-
tween input stages there is significant nonlinearity in the
CMRR.Lowerloadresistanceincreasestheoutputcross-
over 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 be-
tween ground and (V+ – 0.8V). See the Typical Perfor-
mance Characteristics curves.
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 3µA at room temperature. The
input offset voltage is typically 700µV when operating
above V+. The LT1490A will operate with its inputs 44V
above V– regardless of V+.
8
LT1490A
W U U
APPLICATIO S I FOR ATIO
U
Gain
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.
The open-loop gain is almost independent of load when
theoutputissourcingcurrent.Thisoptimizesperformance
U
TYPICAL APPLICATIO S
Square Wave Oscillator
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
59k
5V
100k
100k
+
V
+
IN
1/2 LT1490A
1/2 LT1490A
V
OUT
C
L
≤ 10,000pF
–
–
R
50k
C
1490A TA02
0.22µF
150Ω
0.1µF
1
2RC
f =
1490A TA04
V
= 5V WITH 5V SUPPLY
OUT
= 200µA
P-P
I
S
AT V = 5V, R = 50k, C = 1nF
S
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
D2
D3
R1
30k
R2
1k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
OUT
Q7
Q8
Q11 Q12
R3
1k
+
Q16
2µA
Q15
Q9
Q10
Q13
Q14
Q21
R4
40k
R5
40k
Q5
Q6
D4
D5
–
V
ONE AMPLIFIER
1490A SS
9
LT1490A
U
PACKAGE DESCRIPTIO
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
7
6
5
0.118 ± 0.004**
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
1
2
3
4
0.040 ± 0.006
(1.02 ± 0.15)
0.034 ± 0.004
(0.86 ± 0.102)
0.007
(0.18)
0° – 6° TYP
SEATING
PLANE
0.012
(0.30)
REF
0.021 ± 0.006
(0.53 ± 0.015)
0.006 ± 0.004
(0.15 ± 0.102)
0.0256
(0.65)
BSC
MSOP (MS8) 1098
* 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
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
4
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
0.325
–0.015
0.018 ± 0.003
(0.457 ± 0.076)
0.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1098
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LT1490A
U
PACKAGE DESCRIPTIO
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)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
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
SO8 1298
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1490A
U
TYPICAL APPLICATIO
Ring-Tone Generator
60V
R16
100k
R2
47k
Q1
R3
R5
IRF628
R6
10k
Q3
2N3904
10k
100k
C3
C2
0.047µF
0.47µF
R17
620Ω
Z1
15V
100k
5
R9
300k
R11
+
10k
10
3
2
7
D1
1N4148
1/2 LT1490A
+
+
1
6
8
R1
33k
1/2 LT1490A
1/2 LT1490A
–
4
13
12
R7
16k
–
9
C4
0.068µF
–
–
14
R18
100Ω
1/2 LT1490A
+
C7
47µF
R26
2k
R24
420
R23
4.7k
R12
10k
R14
10k
R4
1.6M
R8
620k
C1
1µF
11
R10
620k
SMOOTHING FILTER
OPTO1*
R25
4.7k
R13
130k
R15
47k
C5
0.01µF
CADENCE OSCILLATOR
20Hz OSCILLATOR
Q5
2N3904
UP TO
LOAD TEN
PHONES
Z2
15V
R19
620Ω
Q4
2N3906
Q2
IRF9620
R21
150Ω
*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
C6
0.033µF
POWER AMPLIFIER
R20
100k
–180V
1490A TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Input/Output Common Mode Includes Ground, 70µV V
and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate
LT1078/LT1079
LT2078/LT2079
Dual/Quad 55µA Max, Single Supply, Precision Op Amps
Dual/Quad 17µA Max, Single Supply, Precison Op Amps
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
OS(MAX)
LT1178/LT1179
LT2178/LT2179
Input/Output Common Mode Includes Ground, 70µV V
and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate
OS(MAX)
LT1366/LT1367
LT1636
475µV V , 500V/mV A , 400kHz GBW
OS(MAX)
VOL(MIN)
Single Over-The-Top Micropower Rail-to-Rail Input and Output
Op Amp
55µA Supply Current, V Extends 44V above V ,
CM EE
Independent of V , MSOP Package, Shutdown Function
CC
LT1638/LT1639
LT1782
Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail
Input and Output Op Amps
0.4V/µs Slew Rate, 230µA Supply Current per Amplifier
Micropower, Over-The-Top, SOT-23, Rail-to-Rail
Input and Output Op Amp
SOT-23, 800µV V , I =55µA (Max),
OS(MAX) S
Gain-Bandwidth = 200kHz, Shutdown Pin
LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail
Input and Output Op Amp
SOT-23, 800µV V , I =300µA (Max),
Gain-Bandwidth = 1.2MHz, Shutdown Pin
OS(MAX)
S
1490af LT/TP 0300 4K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 2000
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