LT1492 [Linear]
5MHz, 3V/us, Low Power Single Supply, Dual and Quad Precision Op Amps; 为5MHz ， 3V /我们来说，低功耗，单电源，双路和四路精密运算放大器
| 型号： | LT1492 |
| 厂家： | 
Linear |
| 描述： | 5MHz, 3V/us, Low Power Single Supply, Dual and Quad Precision Op Amps |
| 文件： | 总16页 (文件大小：365K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1492/LT1493
5MHz, 3V/µs, Low Power
Single Supply, Dual and Quad
Precision Op Amps
U
FEATURES
DESCRIPTION
The LT®1492/LT1493 are dual/quad, low power, single sup-
ply precision op amps with 5MHz gain-bandwidth product,
3V/µs slew rate and only 450µA of quiescent supply current
per amplifier.
■
Gain-Bandwidth Product: 5MHz Typ
■
Slew Rate: 3V/µs Typ
■
Low Supply Current per Amplifier: 0.55mA Max
■
Input Offset Voltage: 180µV Max
■
Input Offset Voltage Drift: 3µV/°C Max
With a maximum input offset voltage of only 180µV, the
LT1492/LT1493 eliminate trims in most systems while pro-
viding high frequency performance not usually found in low
power single supply amplifiers.
■
Input Offset Current: 20nA Max
■
Input Bias Current: 100nA Max
■
Open-Loop Gain: 1500V/mV Min (VS = ±15V)
■
Low Input Noise Voltage: 16.5nV/√Hz
The LT1492/LT1493 will operate on any supply greater than
2.5Vandlessthan36Vtotal, andarespecifiedonsingle3.3V,
single 5V and ±15V supplies. Even with their low quiescent
supply current the minimum output drive is 20mA, ideal for
driving low impedance loads.
■
Low Input Noise Current: 0.14pA/√Hz
■
Large Output Drive Current: 20mA Min
■
Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground While Sinking Current
■
Wide Supply Voltage Range: 2.5V to 36V
The inputs can be driven beyond the supplies without
damage or phase reversal of the output. The low operating
voltage and wide input and output range make the LT1492/
LT1493 amplifiers ideal for battery-powered applications.
■
Specified on 3.3V, 5V and ±15V
■
Dual in 8-Pin PDIP and SO Package
■
Quad in a Narrow 16-Pin SO Package
For applications requiring faster precision single supply
amplifiers, see the 14MHz, 7V/µs LT1211/LT1212, the
28MHz, 12V/µs LT1213/LT1214 or the 23MHz, 50V/µs
LT1215/LT1216.
U
APPLICATIONS
■
Battery-Powered Systems
Portable Instrumentation
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Active Filters
■
Photodiode Amplifiers
DAC Current to Voltage Amplifiers
■
U
Distribution of Offset Voltage
TYPICAL APPLICATION
Drift with Temperature
50
V
= 5V, 0V
S
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE
Precision AC to DC Converter (Full Wave Rectifier and Filter)
40
30
4.99k
+
10k
5V
V
DC
1/2 LT1492
OUT
20
10
0
15k
+
10k
–
V
–
10µF
IN
10k
1/2 LT1492
+
6.49k
V
S
= 5V, 0V
< 1% ERROR FROM 100mV TO 1V, f = 1kHz
10% ERROR AT 10mV, f = 1kHz
1% ERROR AT 5kHz, V = 100mV
10% ERROR AT 30kHz, V = 100mV
–2.5 –2 –1.5 –1 –0.5
0
0.5
1
1.5
2
2.5
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
IN
RMS
RMS
1492/93 TA01
IN
1492/93 G02
1
LT1492/LT1493
W W
U W
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to V–) .............................. 36V
Input Current ...................................................... ±15mA
Output Short-Circuit Duration (Note 1) .........Continuous
Operating Temperature Range ................ –40°C to 85°C
Specified Temperature Range (Note 2) .....–40°C to 85°C
Junction Temperature........................................... 150°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
TOP VIEW
NUMBER
NUMBER
1
2
3
4
5
6
7
8
OUT D
–IN D
+IN D
16
15
14
13
12
11
10
9
OUT A
–IN A
+IN A
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
A
B
D
C
LT1492CN8
LT1492CS8
LT1493CS
OUT B
–IN B
+IN B
A
–
+
V
V
B
–
V
+IN C
–IN C
OUT C
NC
+IN B
–IN B
OUT B
NC
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
S8 PART MARKING
1492
8-LEAD PLASTIC SO
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W (N8)
JMAX = 150°C, θJA = 190°C/ W (S8)
T
TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Industrial and Military grade parts.
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
100
0.6
MAX
UNITS
µV
V
OS
Input Offset Voltage
180
∆V
Long-Term Input Offset Voltage Stability
µV/Mo
OS
∆Time
I
I
Input Offset Current
Input Bias Current
5
20
nA
nA
OS
B
50
100
Input Noise Voltage
Input Noise Voltage Density
0.1Hz to 10Hz
330
nV
P-P
e
f = 10Hz
17.3
16.5
nV/√Hz
nV/√Hz
n
O
f = 1000Hz
O
i
Input Noise Current Density
Input Resistance (Note 3)
f = 10Hz
f = 1000Hz
O
0.78
0.14
pA/√Hz
pA/√Hz
n
O
Differential Mode
Common Mode
10
40
800
MΩ
MΩ
Input Capacitance
f = 1MHz
10
pF
Input Voltage Range
3.4
0
3.60
–0.25
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
= 0V to 3.4V
86
90
102
110
dB
dB
CM
V = 2.5V to 12.5V
S
2
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
V = 0.05V to 3.7V, R = 2k
MIN
TYP
MAX
UNITS
A
VOL
Large-Signal Voltage Gain
175
350
V/mV
O
L
Maximum Output Voltage Swing
(Note 4)
Output High, No Load
4.2
4.1
3.0
4.35
4.25
3.15
V
V
V
Output High, I
Output High, I
= 1mA
= 15mA
SOURCE
SOURCE
Output Low, No Load
0.003
0.062
0.362
0.006
0.075
0.500
V
V
V
Output Low, I
Output Low, I
= 1mA
= 15mA
SINK
SINK
I
Maximum Output Current (Note 8)
Slew Rate
±20
±60
1.8
mA
V/µs
MHz
µA
V
O
SR
A = –2
V
GBW
Gain-Bandwidth Product
Supply Current per Amplifier
Minimum Supply Voltage
Full Power Bandwidth
Rise Time, Fall Time
Overshoot
f = 100kHz
4.5
I
425
2.1
550
2.5
S
A = 1, V = 2.5V
P-P
150
100
20
kHz
ns
V
O
t , t
A = 1, 10% to 90%, V = 100mV
V O
r
f
OS
A = 1, V = 100mV
V
%
O
t
t
Propagation Delay
A = 1, V = 100mV
100
2.6
ns
PD
S
V
O
Settling Time
0.01%, A = 1, ∆V = 2V
µs
V
O
Open-Loop Output Resistance
Total Harmonic Distortion
I = 0mA, f = 2MHz
130
0.005
Ω
O
THD
A = 1, V = 1V , f = 20Hz to 20kHz
RMS
%
V
O
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
120
1
MAX
280
3
UNITS
µV
V
OS
Input Offset Voltage
●
●
V
OS
Input Offset Voltage Drift (Note 3)
µV/°C
∆T
I
Input Offset Current
Input Bias Current
Input Voltage Range
●
●
5
25
nA
nA
OS
B
I
55
110
●
●
3.4
0
3.55
–0.15
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0V to 3.4V
●
●
●
84
90
102
110
250
dB
dB
CM
V = 2.5V to 12.5V
S
A
VOL
V = 0.05V to 3.7V, R = 2k
O
140
V/mV
L
Maximum Output Voltage Swing
(Note 4)
Output High, No Load
●
●
●
4.1
4.0
2.9
4.25
4.15
3.05
V
V
V
Output High, I
Output High, I
= 1mA
= 15mA
SOURCE
SOURCE
Output Low, No Load
●
●
●
0.004
0.070
0.390
0.007
0.085
0.525
V
V
V
Output Low, I
Output Low, I
= 1mA
= 15mA
SINK
SINK
I
Supply Current per Amplifier
●
470
650
µA
S
3
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
150
1
MAX
325
3
UNITS
µV
V
Input Offset Voltage
●
●
OS
V
Input Offset Voltage Drift (Note 3)
µV/°C
OS
∆T
I
Input Offset Current
Input Bias Current
Input Voltage Range
●
●
5
40
nA
nA
OS
B
I
55
130
●
●
3.4
0
3.5
–0.1
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0V to 3.4V
●
●
●
80
90
90
dB
dB
CM
V = 2.5V to 12.5V
110
220
S
A
V
= 0.05V to 3.7V, R = 2k
140
V/mV
VOL
O
L
Maximum Output Voltage Swing
(Note 4)
Output High, No Load
●
●
●
3.95
3.85
2.75
4.15
4.05
2.95
V
V
V
Output High, I
Output High, I
= 1mA
= 15mA
SOURCE
SOURCE
Output Low, No Load
●
●
●
0.005
0.073
0.400
0.008
0.095
0.575
V
V
V
Output Low, I
Output Low, I
= 1mA
= 15mA
SINK
SINK
I
Supply Current per Amplifier
●
480
700
µA
S
±15V ELECTRICAL CHARACTERISTICS
VS = ±15V, VCM = 0V, VOUT = 0V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
120
5
MAX
450
20
UNITS
µV
V
OS
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Voltage Range
I
I
nA
OS
45
100
nA
B
13.4
–15.0
13.6
–15.2
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 13.4V
86
90
102
113
dB
dB
CM
V = ±2V to ±16V
S
A
VOL
V = ±10V, R = 5k
O
1500
12.9
–14.4 –14.6
6500
13.15
V/mV
L
Maximum Output Voltage Swing
Output High, I
Output Low, I
= 15mA
V
V
SOURCE
= 15mA
SINK
I
Maximum Output Current
Slew Rate
(Note 8)
±20
2
±55
3
mA
V/µs
MHz
µA
O
SR
A = –2, (Note 5)
V
GBW
Gain-Bandwidth Product
Supply Current per Amplifier
Channel Separation
Minimum Supply Voltage
Full Power Bandwidth
Settling Time
f = 100kHz
3
5
I
500
140
±1.4
30
800
S
V = ±10V, R = 5k
O
128
dB
L
±2
V
A = 1, V = 20V
P-P
kHz
µs
V
O
t
0.01%, A = 1, ∆V = 10V
5.8
S
V
O
4
LT1492/LT1493
±15V ELECTRICAL CHARACTERISTICS
VS = ±15V, VCM = 0V, VOUT = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
160
1
MAX
550
3
UNITS
µV
V
OS
Input Offset Voltage
●
●
V
OS
Input Offset Voltage Drift (Note 3)
µV/°C
∆T
I
Input Offset Current
Input Bias Current
Input Voltage Range
●
●
10
55
30
nA
nA
OS
B
I
120
●
●
13.4
–15.0
13.5
–15.1
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 13.4V
●
●
●
84
90
101
108
dB
dB
CM
V = ±2V to ±16V
S
A
VOL
V = ±10V, R = 5k
O
1200
4000
V/mV
L
Maximum Output Voltage Swing
Output High, I
= 15mA
= 15mA
●
●
12.7
–14.2
13.0
–14.6
V
V
SOURCE
Output Low, I
SINK
I
Supply Current per Amplifier
●
600
930
µA
S
VS = ±15V, VCM = 0V, VOUT = 0V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
180
1
MAX
650
3
UNITS
µV
V
OS
Input Offset Voltage
●
●
V
OS
Input Offset Voltage Drift (Note 3)
µV/°C
∆T
I
Input Offset Current
Input Bias Current
Input Voltage Range
●
●
10
55
50
nA
nA
OS
B
I
150
●
●
13.4
–15.0
13.45
–15.05
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 13.4V
●
●
●
82
90
101
108
dB
dB
CM
V = ±2V to ±16V
S
A
VOL
V = ±10V, R = 5k
O
1000
3500
V/mV
L
Maximum Output Voltage Swing
Output High, I
= 15mA
= 15mA
●
●
12.5
–14.1
12.9
–14.6
V
V
SOURCE
Output Low, I
SINK
I
Supply Current per Amplifier
●
620
1000
µA
S
5
LT1492/LT1493
3.3V ELECTRICAL CHARACTERISTICS
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted. (Note 6)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
Input Voltage Range (Note 7)
100
180
µV
OS
1.7
0
1.9
–0.2
V
V
Maximum Output Voltage Swing
Maximum Output Current
Output High, No Load
2.50
2.40
1.30
2.65
2.55
1.45
V
V
V
Output High, I
Output High, I
= 1mA
= 15mA
SOURCE
SOURCE
Output Low, No Load
0.003
0.062
0.362
0.006
0.075
0.500
V
V
V
Output Low, I
Output Low, I
= 1mA
= 15mA
SINK
SINK
I
±20
±50
mA
O
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 6)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
Input Voltage Range (Note 7)
●
120
280
µV
OS
●
●
1.7
0
1.8
–0.1
V
V
Maximum Output Voltage Swing
Output High, No Load
●
●
●
2.4
2.3
1.2
2.55
2.45
1.35
V
V
V
Output High, I
= 1mA
= 15mA
SOURCE
SOURCE
Output High, I
Output Low, No Load
●
●
●
0.004
0.070
0.390
0.007
0.085
0.525
V
V
V
Output Low, I
Output Low, I
= 1mA
= 15mA
SINK
SINK
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Notes 2, 6)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
Input Voltage Range (Note 7)
●
150
325
µV
OS
●
●
1.7
0
1.75
–0.05
V
V
Maximum Output Voltage Swing
Output High, No Load
●
●
●
2.25
2.15
1.05
2.45
2.35
1.25
V
V
V
Output High, I
= 1mA
= 15mA
SOURCE
SOURCE
Output High, I
Output Low, No Load
●
●
●
0.005
0.073
0.400
0.008
0.095
0.575
V
V
V
Output Low, I
Output Low, I
= 1mA
= 15mA
SINK
SINK
The
●
denotes specifications that apply over the full operating
Note 5: Slew rate is measured between ±5V on an output swing of ±10V
on ±15V supplies.
temperature range.
Note 1: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 2: The LT1492/LT1493 are designed, characterized and expected to
meet these extended temperature limits, but are not tested at –40°C and
85°C. Guaranteed I grade parts are available. Consult factory.
Note 6: Most LT1492/LT1493 electrical characteristics change very little
with supply voltage. See the 5V tables for characteristics not listed in the
3.3V table.
Note 7: Guaranteed by correlation to V = 5V and V = ±15V tests.
S
S
Note 8: Guaranteed by correlation to V = 3.3V tests.
S
Note 3: This parameter is not 100% tested.
Note 4: Guaranteed by correlation to V = 3.3V and V = ±15V tests.
S
S
6
LT1492/LT1493
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Offset Voltage Drift
with Temperature
Distribution of Input Offset Voltage
Distribution of Input Offset Voltage
50
40
30
40
35
30
25
20
15
10
5
40
35
30
25
20
15
10
5
V
= 5V, 0V
V
= 5V, 0V
S
V
= ±15V
S
S
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE
LT1492 N8,
S8 PACKAGES
LT1493
S16 PACKAGE
20
10
0
0
0
0
50
–1.5 –1
0.5
1
0
100
200 300 400
–200 –150 –100 –50
100 150 200
–2.5 –2
–0.5
0
1.5
2
2.5
–400 –300 –200 –100
INPUT OFFSET VOLTAGE (µV)
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
INPUT OFFSET VOLTAGE (µV)
1492/93 G01
1492/93 G02
1492/93 G03
Gain-Bandwidth Product,
Phase Margin vs Supply Voltage
5.5
Voltage Gain, Phase vs Frequency
Slew Rate vs Temperature
80
70
60
50
120
100
80
4
3
A
= –2
= 10k
V
L
T
= –55°C
T = 25°C
A
A
5.0
4.5
4.0
3.5
70
R
PHASE
V
V
= ±15V
S
T
= 125°C
= 125°C
A
A
60
V
V
= ±15V
40
30
40
20
S
S
= 5V
GAIN
S
T
20
10
0
60
2
1
–20
–40
–60
–80
50
T
= –55°C
= 25°C
A
A
= 5V
50
T
0
40
V
= ±2.5V
S
–10
–20
30
V
= ±15V
S
20
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1
5
10
20 30 40
–50
25
75
100 125
–25
0
TOTAL SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
1492/93 G05
1492/93 G04
1492/93 G06
Undistorted Output Swing
vs Frequency, VS = ±2.5V
Slew Rate vs Supply Voltage
Capacitive Load Handling
5
4
3
2
1
0
80
70
60
50
4
3
V
= ±2.5V
A
= –2
S
V
L
A
A
= –1
= 1
V
V
R
= 10k
T
= 125°C
= 25°C
A
T
A
40
30
20
10
A
= 1
A = 5
V
V
2
1
T
A
= –55°C
A
= 10
V
V
= ±2.5V
= 100k
S
L
R
DISTORTION ≤ 1%
0
10
100
1000
10000
1k
10k
100k
1M
0
4
8
12 16 20 24 28 32 36
CAPACITIVE LOAD (pF)
FREQUENCY (Hz)
TOTAL SUPPLY VOLTAGE (V)
1492/93 G08
1492/93 G09
1492/93 G07
7
LT1492/LT1493
TYPICAL PERFORMANCE CHARACTERISTICS
U W
Open-Loop Voltage Gain
vs Supply Voltage
Undistorted Output Swing
Total Harmonic Distortion
and Noise vs Frequency
vs Frequency, VS = ±15V
1
0.1
30
25
20
15
10
5
5000
4000
3000
2000
1000
0
V
V
= 5V, 0V
= 3V
R = 2k
L
S
OUT
A
V
= 1
A = –1
V
P-P
T
= –55°C
A
R
= 2k
L
T
= 25°C
A
0.01
A
= 10
= 1
V
T
= 125°C
A
A
0.001
0.0001
V
V
= ±15V
S
L
R
= 100k
DISTORTION ≤ 1%
0
1k
10k
FREQUENCY (Hz)
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
0
4
8
12 16 20 24 28 32 36 40
TOTAL SUPPLY VOLTAGE (V)
1492/93 G10
1492/93 G11
1492/93 G12
Positive Output Saturation
Voltage vs Load Current
Open-Loop Gain, VS = 5V
Voltage Gain vs Load Resistance
2.5
2.0
1.5
1.0
0.5
0
100000
10000
1000
V
S
= 5V, 0V
T
= 25°C
A
V
S
= ±15V
S
RL = 2k
L = 5k
R
V
= 5V, 0V
T
T
= –55°C
= 125°C
A
A
100
0
1
2
3
4
5
T
= 25°C
A
1492/93 G13
OUTPUT (V)
10
–0.001 –0.01
–0.1
–1
–10
–100
0
2
4
6
8
10
LOAD CURRENT (mA)
LOAD RESISTANCE (kΩ)
1492/93 G15
1492/93 G14
Negative Output Saturation
Voltage vs Load Current
Open-Loop Gain, VS = ±15V
Channel Separation vs Frequency
1000
100
130
120
110
100
90
V
= 5V, 0V
S
V
= ±15V
S
RL = 2k
RL = 5k
10
T
T
= 125°C
A
A
80
–10
0
10
70
= 25°C, –55°C
1492/93 G16
OUTPUT (V)
60
1
0.001
0.01
0.1
1
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
LOAD CURRENT (mA)
1492/93 G18
1492/93 G17
8
LT1492/LT1493
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Output Short-Circuit Current
vs Temperature
Output Impedance vs Frequency
5V Small-Signal Response
80
70
60
50
40
30
1000
100
V
= ±2.5V
S
V
= ±2.5V
S
SOURCING
V
= ±2.5V
S
SINKING
A
= 100
= 10
V
10
1
V
= ±15V
S
SOURCING
A
OR SINKING
V
1492/93 G21
500ns/DIV
VS = 5V
V = 1
A
V
= 1
A
0.1
10k
–50
0
25
50
75 100 125
–25
100k
1M
10M
TEMPERATURE (°C)
FREQUENCY (Hz)
1492/93 G19
1492/93 G20
5V Large-Signal Response
5V Large-Signal Response
±15V Small-Signal Response
1492/93 G22
1492/93 G23
1492/93 G24
2µs/DIV
2µs/DIV
500ns/DIV
VS = 5V
V = 1
VS = 5V
V = – 1
F = RG = 2k
VS = ±15V
V = 1
A
A
A
R
Settling Time to 1mV
vs Output Step
±15V Large-Signal Response
±15V Large-Signal Response
10
8
V
S
= ±15V
6
INVERTING
4
NONINVERTING
2
0
–2
–4
–6
–8
–10
1492/93 G25
1492/93 G26
NONINVERTING
INVERTING
5µs/DIV
5µs/DIV
VS = ±15V
V = 1
VS = ±15V
V = – 1
F = RG = 2k
A
A
R
0
1
3
4
5
6
2
SETTLING TIME (µs)
1492/93 G27
9
LT1492/LT1493
TYPICAL PERFORMANCE CHARACTERISTICS
U W
Supply Current vs Temperature
Supply Current vs Supply Voltage
Warm-Up Drift vs Time
0.65
0.55
1.0
0.8
0.6
0.4
0.2
0
10
8
N8 PACKAGE
R
L
= ∞
6
4
V
S
= ±15V
2
V
= ±2.5V
= ±15V
S
T
= 125°C
= 25°C
A
0.45
0.35
0.25
0
V
S
= 5V, 0V
V
–2
–4
–6
–8
–10
S
T
A
T
= –55°C
A
–25
0
50
75 100 125
–50
25
0
1
2
3
4
5
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
TIME (SEC)
1492/93 G28
1492/93 G29
1492/93 G30
Input Bias Current
Common Mode Range
vs Temperature
vs Common Mode Voltage
Input Bias Current vs Temperature
+
20
0
65
60
V
V
S
= 5V, 0V
V
S
= 5V, 0V
–20
+
V
– 1
–40
55
50
45
40
35
T
= –55°C
–60
A
–80
+
–
V
V
– 2
+ 2
T
A
= 125°C
I
OS
–100
–120
–140
–160
–180
–200
–220
+I
B
–I
B
–
V
T
= 25°C
A
–
30
V
– 1
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
–1
0
1
2
3
4
–50 –25
25
50
75 100 125
0
COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
1492/93 G31
1492/93 G32
1492/93 G33
Input Noise Current, Noise Voltage
Density vs Frequency
Common Mode Rejection Ratio
vs Frequency
Input Referred Power Supply
Rejection Ratio vs Frequency
20
18
16
14
2.0
1.8
1.6
1.4
120
100
80
100
80
60
40
20
0
V
T
= ±15V
= 25°C
V
A
= ±15V
= 100
S
A
V
= ±2.5V
S
V
S
VOLTAGE NOISE
12
10
1.2
1.0
8
6
4
2
0
0.8
0.6
0.4
0.2
0
60
POSITIVE SUPPLY
40
CURRENT NOISE
1k
NEGATIVE SUPPLY
20
10
100
10k
1k
10k
100k
FREQUENCY (Hz)
1M
10M
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
1492/93 G34
1492/93 G26
1492/93 G35
10
LT1492/LT1493
U
W U U
APPLICATIONS INFORMATION
Supply Voltage
stillfunctional. However, theinputbiascurrentwillshiftas
shown in the characteristic curves. For full precision
performance, the common mode range should be limited
between ground (V–) and 1.5V below the positive supply.
When either of the inputs is taken below ground (V–) by
more than about 700mV, that input current will increase
dramatically. The current is limited by internal 100Ω
resistors between the input pins and diodes to each
supply. The output will remain low (no phase reversal) for
inputs1.3Vbelowground(V–).Iftheoutputdoesnothave
to sink current, such as in a single supply system with a 1k
load to ground, there is no phase reversal for inputs up to
8V below ground.
The LT1492/LT1493 op amps are fully functional and all
internal bias circuits are in regulation with 2.1V of supply.
The amplifiers will continue to function with as little as
1.6V, although the input common mode range and the
phase margin are about gone. The minimum operating
supply voltage is guaranteed by the PSRR tests that are
done with the input common mode equal to 500mV and a
minimum supply voltage of 2.5V.
The positive supply pin of the LT1492/LT1493 should be
bypassed with a small capacitor (about 0.01µF) within an
inch of the pin. When driving heavy loads and for good
settling time, an additional 4.7µF capacitor should be
used. When using split supplies, the same is true for the
negative supply pin.
There are no clamps across the inputs of the LT1492/
LT1493 and therefore each input can be forced to any
voltage between the supplies. The input current will re-
main constant at about 50nA over most of this range.
Whenaninputgetscloserthan1.5Vtothepositivesupply,
that input current will gradually decrease to zero until the
input goes above the supply, then will increase due to the
previously mentioned diodes. If the inverting input is held
more positive than the noninverting input by 200mV or
more, while at the same time the noninverting input is
within 300mV to ground (V–), then the supply current will
increase by 1mA and the noninverting input current will
increase to about 10µA. This should be kept in mind in
comparator applications where the inverting input stays
above ground (V–) and the noninverting input is at or near
ground (V–).
Power Dissipation
TheLT1492/LT1493combinehighspeedandlargeoutput
drive in small packages. Because of the wide supply
voltage range, it is possible to exceed the maximum
junction temperature under certain conditions. Maximum
junction temperature (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:
LT1492CN8: TJ = TA + (PD • 130°C/W)
LT1492CS8: TJ = TA + (PD • 190°C/W)
LT1493CS: TJ = TA + (PD • 150°C/W)
Worst-case power dissipation occurs at the maximum
supply current and when the output voltage is at 1/2 of
either supply voltage (or the maximum swing if less than
1/2 supply voltage). For each amplifier PDMAX is:
Output
The output of the LT1492/LT1493 will swing to within
0.65V of the positive supply and to within 3mV of the
negative supply with no load. Underloaded conditions see
the Typical Performance curves for the output saturation
voltage characteristics.
PDMAX = (V+ – V–)(ISMAX) + (V+/2)2/RL
Example: LT1493 at 70°C, VS = ±15V, RL = 1k
PDMAX = (30V)(930µA) + (7.5V)2/1kΩ = 84.2mW
TJMAX = 70°C + (4 • 84.2mW)(150°C/W) = 121°C
The output of the LT1492/LT1493 has reverse-biased
diodestoeachsupply. Iftheoutputisforcedbeyondeither
supply, unlimited currents will flow. If the current is
transient and limited to several hundred milliamps, no
damage will occur.
Inputs
Typically, at room temperature, the inputs of the LT1492/
LT1493 can common mode 400mV below ground (V–)
and to within 1.2V of the positive supply with the amplifier
11
LT1492/LT1493
U
W U U
APPLICATIONS INFORMATION
Feedback Components
Comparator Applications
Because the input currents of the LT1492/LT1493 are less
than 100nA, it is possible to use high value feedback
resistors to set the gain. However, care must be taken to
insure that the pole that is formed by the feedback resis-
tors and the input capacitance does not degrade the
stability of the amplifier. For example, if a single supply,
noninverting gain of 2 is set with two 62k resistors, the
LT1492/LT1493 will probably oscillate. This is because
the amplifier goes open-loop at 1MHz (6dB of gain) and
has 50° of phase margin. The feedback resistors and the
10pF input capacitance generate a pole at 500kHz that
introduces 63° of phase shift at 1MHz! The solution is
simple, lower the values of the resistors or add a feedback
capacitor of 10pF or more.
Sometimes it is desirable to use an op amp as a compara-
tor. When operating the LT1492/LT1493 on a single 3.3V
or 5V supply, the output interfaces directly with most TTL
and CMOS logic.
The response time of the LT1492/LT1493 is a strong
function of the amount of input overdrive as shown in the
following photos. These amplifiers are unity-gain stable
op amps and not fast comparators, therefore, the logic
being driven may oscillate due to the long transition time.
The output can be speeded up by adding 20mV or more of
hysteresis (positive feedback), but the offset is then a
function of the input direction.
Comparator Response (+)
20mV, 10mV, 5mV, 2mV Overdrives
Capacitive Loading
4
2
The LT1492/LT1493 are optimized for low voltage, single
supply operation. The Maximum Capacitive Load vs Load
Current typical performance curve shows the circuit per-
formance without any load resistance. When the output is
sinking current or driving heavy loads with high supplies,
capacitive load handling is degraded.
0
100
0
Maximum Capacitive Load vs Load Current
1492/93 AI02
20µs/DIV
V
S = 5V
10000
SOURCING
SINKING
RL
=
∞
V
= ±2.5V
S
Comparator Response (–)
20mV, 10mV, 5mV, 2mV Overdrives
1000
100
10
V
= ±15V
S
4
2
V
= ±2.5V
S
V
= ±15V
S
0
100
0
0.1
1
10
100
LOAD CURRENT (mA)
1492/93 AI01
1492/93 AI02
VS = 5V
RL
20µs/DIV
=
∞
12
LT1492/LT1493
W
W
SI PLIFIED SCHE ATIC
+
V
I
I
I
4
I
I
5
I
2
6
1
3
Q13
BIAS
C
M
Q14
Q15
Q4
Q3
–IN
+IN
Q11
Q1
OUT
Q2
R
F
Q12
Q7
Q9
C
F
Q10
Q8
Q16
Q5
Q6
C
O
I
I
7
8
C
I
–
V
1492/93 SS
U
TYPICAL APPLICATIONS
1A Voltage-Controlled Current Source
1A Voltage-Controlled Current Sink
+
+
V
V
1Ω
1k
+
R
L
V
1k
I
OUT
1k
200pF
V
IN
+
V
IN
–
100Ω
1/2
LT1492
Si9410DY
N-CHANNEL
100Ω
1/2
Si9430DY
LT1492
P-CHANNEL
–
+
100pF
1k
I
OUT
V
1Ω
t < 1µs
IN
1k
I
=
OUT
R
L
V
1Ω
r
1Ω
IN
I
=
OUT
1492/93 TA05
t < 1µs
r
1492/93 TA06
Ground Current Sense Amplifier
+
V
5V
0.1µF
LOAD
+
1/2
V
= 1V/A
O
LT1492
I
IN
–
OFFSET ≤ 3.6mA
0.05Ω
BANDWIDTH = 250kHz
r
1910Ω
t = 1µs
100pF
100Ω
1492/93 TA07
13
LT1492/LT1493
U
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
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
(3.175)
MIN
0.005
(0.127)
MIN
0.015
+0.025
–0.015
(0.380)
MIN
0.325
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
N8 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0996
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
14
LT1492/LT1493
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
16
15
14
13
12
11
10
9
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
5
7
8
1
2
3
4
6
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
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
0.016 – 0.050
0.406 – 1.270
S16 0695
*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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT1492/LT1493
TYPICAL APPLICATION
U
Single Supply 100kHz 4th Order Butterworth Filter
Frequency Response
10
0
100pF
6.81k
11.3k
+
47pF
5.23k
10.2k
V
6.81k
–10
–20
–30
–40
–50
–60
–70
–80
–90
V
–
IN
5.23k
1/2 LT1492
–
330pF
V
+
1/2 LT1492
1000pF
OUT
+
+
V /2
1492/93 TA03
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
1492/93 TA04
RELATED PARTS
PART NUMBER
LTC®1152
DESCRIPTION
COMMENTS
High DC Accuracy, 10 µV V
Rail-to-Rail Input and Output, Zero-Drift Op Amp
, 100nV/ °C Drift, 1MHz
OS(MAX)
GBW, 1V/ µs Slew Rate, Max Supply Current 2.2mA
LT1211/LT1212 Dual/Quad 14MHz, 7V/ µs, Single Supply Precision Op Amps
LT1213/LT1214 Dual/Quad 28MHz, 12V/ µs, Single Supply Precision Op Amps
LT1215/LT1216 Dual/Quad 23MHz, 50V/ µs, Single Supply Precision Op Amps
LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
LT1490/LT1491 Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps
Input Common Mode Includes Ground, 275 µV V
6µV/°C Max Drift, Max Supply Current 1.8mA per Amplifier
,
OS(MAX)
Input Common Mode Includes Ground, 275 µV V
6µV/°C Max Drift, Max Supply Current 3.5mA per Amplifier
,
OS(MAX)
Input Common Mode Includes Ground, 450 µV V
Max Supply Current 6.6mA per Amplifier
,
OS(MAX)
475 µV V
, 400kHz GBW, 0.13V/ µs Slew Rate,
OS(MAX)
Max Supply Current 520 µA per Amplifier
Max Supply Current 50
µA per Amplifier, 200kHz GBW, 0.07V/ µs
–
+
Slew Rate, Operates with Inputs 44V Above V
Independent of V
TM
LT1498/LT1499 Dual/Quad Rail-to-Rail Input and Output Precision C-Load
475µV V
, 10MHz GBW, 6V/ µs Slew Rate,
OS(MAX)
Op Amps
Max Supply Current 2.2mA per Amplifier
C-Load is a trademark of Linear Technology Corporation.
14923f LT/TP 1097 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1997
16 Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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