LT1494IS8#PBF [Linear]
暂无描述;LT1494/LT1495/LT1496
1.5µA Max, Single, Dual
and Quad Over-The-Top Precision
Rail-to-Rail Input and Output Op Amps
U
FEATURES
DESCRIPTIO
The LT®1494/LT1495/LT1496 are the lowest power
(IS ≤ 1.5µA) op amps with precision specifications. The
extremely low supply current is combined with excellent
■
Low Supply Current: 1.5µA Max
■
Rail-to-Rail Input and Output
■
■
■
■
■
■
■
■
■
■
Low Offset Voltage: 375µV Max
amplifier specifications: input offset voltage is 375µV
maximum with a typical drift of only 0.4µV/°C, input offset
current is 100pA maximum. A minimum open-loop gain
(AVOL) of 100V/mV ensures that gain errors are small. The
device characteristics change little over the supply range
of2.2Vto±15V. Supplyrejectionis90dBandthecommon
moderejectionratiois90dB. Operationisspecifiedfor3V,
5V and ±15V supplies. Reverse battery protection
(–18V min) and inputs that operate above the positive
supply make the LT1494/LT1495/LT1496 easy to use in
harsh environments.
Operating Temperature Range: –40°C to 125°C
Over-The-TopTM Inputs Operate Above V+
Wide Supply Range: 2.2V to 36V
Single Supply Input Range: –0.3V to 36V
Low Input Bias Current: 250pA
Low Input Offset Current: 20pA
High AVOL: 100V/mV Minimum Driving 100kΩ Load
Output Sources and Sinks 500µA Load Current
Reverse Battery Protected to 18V
U
APPLICATIO S
The low bias currents and offset current of the amplifier
permit the use of megohm level source resistors without
introducing significant errors. Voltage noise at 4µVP-P is
remarkably low considering the low supply current.
■
Battery- or Solar-Powered Systems
■
Portable Instrumentation
■
Remote Sensor Amplifier
Micropower Filter
The LT1494 is available in the 8-Pin MSOP, PDIP and SO
packages.The LT1495 is available in plastic 8-Pin PDIP
and SO packages with the standard dual op amp pinout.
The LT1496 is available in 14-Pin SO and PDIP packages.
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATION
Micropower Integrating Current Sense
TC VOS Distribution
RESET
30
100 AMPLIFIERS
V
= ±2.5V
S
0.1µF
25
20
15
10
5
–40°C TO 85°C
V
CC
R
I
1M
–
R
S
–
1/2 LT1495
0.1Ω
1M
1/2 LT1495
V
O
+
I
L
+
10M
10M
LOAD
1495 TA01
V
CC
0
200k
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
TC V (µV/°C)
OS
OUTPUT SWITCHES
WHEN I dt = 0.98 V
L
1495 TA02
R
R
I
C = (4.9A)(SEC) FOR V = 5V
CC
CC
(
)
S
I
= 3µA DURING INTEGRATION; I = 5µA END OF INTEGRATION
S
S
1
LT1494/LT1495/LT1496
W W U W
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V+ to V–) .............................. 36V
Differential Input Voltage ......................................... 36V
Input Current ...................................................... ±10mA
Output Short-Circuit Duration.......................Continuous
Operating Temperature Range (Note 2)
Specified Temperature Range (Note 3)
LT1494C/LT1495C/LT1496C .............. –40°C to 85°C
LT1494I/LT1495I/LT1496I ................. –40°C to 85°C
LT1494H/LT1495H/LT1496H ........... –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Junction Temperature........................................... 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LT1494C/LT1495C/LT1496C .............. –40°C to 85°C
LT1494I/LT1495I/LT1496I ................. –40°C to 85°C
LT1494H/LT1495H/LT1496H ........... –40°C to 125°C
U
W U
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
NC
–IN
+IN
1
2
3
4
8
7
6
5
NC
LT1494CN8
LT1494CS8
LT1494IN8
LT1494IS8
LT1494HS8
TOP VIEW
LT1494CMS8
LT1494IMS8
+
V
NC 1
–IN 2
8 NC
7 V
6 OUT
5 NC
+
OUT
NC
+IN
V
3
4
–
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
MS8 PART MARKING
T
JMAX = 150°C, θJA = 250°C/ W
TJMAX = 150°C, θJA = 130°C/ W (N8)
T
JMAX = 150°C, θJA = 190°C/ W (S8)
1494
1494I
1494H
LTFF
LTFG
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
1
2
3
4
5
6
7
OUT D
–IN D
+IN D
14
13
12
11
10
9
OUT A
–IN A
+IN A
LT1495CN8
LT1495CS8
LT1495IN8
LT1495IS8
LT1495HS8
+
LT1496CN
LT1496CS
LT1496IN
LT1496IS
LT1496HS
OUT A
–IN A
+IN A
1
2
3
4
V
8
7
6
5
A
B
D
C
OUT B
–IN B
+IN B
A
–
+
V
V
B
+IN C
–IN C
OUT C
+IN B
–IN B
–
V
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8
OUT B
S8 PART MARKING
8-LEAD PLASTIC SO
S PACKAGE
14-LEAD PLASTIC SO
N PACKAGE
14-LEAD PDIP
T
JMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
1495
1495I
1495H
TJMAX = 150°C, θJA = 130°C/ W (N)
JMAX = 150°C, θJA = 160°C/ W (S)
T
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
V = 5V
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
150
200
150
200
375
475
475
575
µV
µV
µV
µV
S
V = 3V
S
V = 5V, MS8 Package
S
V = 3V, MS8 Package
S
I
I
Input Bias Current
(Note 5)
250
180
20
4
185
10
500
250
1000
360
100
pA
nA
pA
B
V
CM
= 10V (Note 6)
Input Offset Current
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Large-Signal Voltage Gain
(Note 5)
OS
0.1Hz to 10Hz
f = 100Hz
f = 100Hz
µV
P-P
nV/√Hz
fA/√Hz
V/mV
V/mV
e
n
i
n
A
V = 5V, V = 0.25V to 4.5V, R = 100k
100
50
VOL
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
0
36
V
CMRR
PSRR
Common Mode Rejection Ratio
V
V
= 0V to 4V, V = 5V
90
74
90
106
95
99
2.1
50
dB
dB
dB
V
mV
mV
V
V
CM
CM
S
= 0V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.2V to 12V, V = V = 0.5V
S
CM
O
2.2
100
410
V
OL
V
OH
No Load
I
= 100µA
210
V – 0.035
V – 0.160
SINK
+
+
Output Voltage Swing HIGH
No Load
= 100µA
V – 0.07
V – 0.32
+
+
I
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
Reverse Supply Voltage
Slew Rate
(Note 5)
(Note 6)
0.7
1.3
1.0
mA
µA
V
V/ms
kHz
SC
1.5
S
I = 10µA per Amplifier
–18
0.4
S
SR
GBW
A = –1, V = ±5V
1.0
2.7
V
S
Gain Bandwidth Product
f = 100Hz
3
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half
supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
V = 5V
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
●
●
175
225
175
225
425
525
525
625
µV
µV
µV
µV
OS
S
V = 3V
S
V = 5V, MS8 Package
S
V = 3V, MS8 Package
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 4)
(Note 5)
●
0.4
250
240
20
280
150
2
µV/°C
OS
I
I
●
●
1200
500
120
36
pA
nA
pA
V/mV
V/mV
B
V
= 10V (Note 6)
CM
Input Offset Current
Large-Signal Voltage Gain
(Note 5)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
OS
A
●
●
75
40
0.2
VOL
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
●
V
CMRR
PSRR
Common Mode Rejection Ratio
V
V
= 0.2V to 4V, V = 5V
●
●
89
64
89
106
85
99
2.3
55
225
V – 0.04
V – 0.18
dB
dB
dB
V
mV
mV
V
V
CM
CM
S
= 0.2V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.4V to 12V, V = V = 0.5V
●
●
S
CM
O
2.4
110
450
V
V
No Load
●
●
OL
OH
I
= 100µA
SINK
+
+
Output Voltage Swing HIGH
No Load
= 100µA
●
●
V – 0.08
V – 0.36
+
+
I
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
(Note 5)
(Note 6)
●
●
0.6
1.1
1.2
mA
µA
SC
1.8
S
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO =
half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
V = 5V
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
●
●
200
250
200
250
475
575
575
675
µV
µV
µV
µV
OS
S
V = 3V
S
V = 5V, MS8 Package
S
V = 3V, MS8 Package
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 4)
(Note 5)
●
0.4
250
275
20
215
115
2
µV/°C
OS
I
I
●
●
1700
pA
nA
pA
V/mV
V/mV
B
V
= 10V (Note 6)
CM
Input Offset Current
Large-Signal Voltage Gain
(Note 5)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
170
OS
A
●
●
55
30
VOL
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
Common Mode Rejection Ratio
●
0.2
88
36
V
dB
dB
CMRR
PSRR
V
V
= 0.2V to 4V, V = 5V
●
●
106
75
CM
CM
S
= 0.2V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.7V to 12V, V = V = 0.5V
●
●
88
99
2.6
60
245
V – 0.05
V – 0.19
dB
V
mV
mV
mV
mV
S
CM
O
2.7
120
490
V
V
No Load
●
●
OL
OH
I
= 100µA
SINK
+
+
Output Voltage Swing HIGH
No Load
= 100µA
●
●
V – 0.10
V – 0.38
+
+
I
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
(Note 5)
(Note 6)
●
●
0.4
0.9
1.5
mA
µA
SC
2.3
S
4
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VO =
half supply, unless otherwise noted. (Note 3)
LT1494H/LT1495H/LT1496H
SYMBOL PARAMETER
CONDITIONS
V = 5V
V = 3V
S
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
●
●
225
275
875
975
µV
µV
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 4)
(Note 5)
●
0.4
3.8
0.300
0.3
25
17
3
10
2
µV/°C
OS
I
I
●
●
nA
µA
nA
V/mV
V/mV
B
V
CM
= 10V (Note 6)
Input Offset Current
Large-Signal Voltage Gain
(Note 5)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
2
OS
A
VOL
●
●
4
2
S
O
L
V = 3V, V = 0.25V to 2.5V, R = 100k
S
O
L
Input Voltage Range
Common Mode Rejection Ratio
●
0.5
72
36
V
dB
dB
CMRR
PSRR
V
CM
V
CM
= 0.5V to 4V, V = 5V
●
●
95
85
S
= 0.5V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
V = 2.7V to 12V, V = V = 0.5V
●
●
86
105
dB
V
mV
mV
mV
mV
µA
S
CM
O
2.7
160
550
V
OL
V
OH
No Load
●
●
70
I
= 100µA
275
SINK
+
+
Output Voltage Swing HIGH
Supply Current per Amplifier
No Load
= 100µA
●
●
V – 140
V – 450
V – 45
+
+
I
V – 225
SOURCE
I
(Note 6)
●
2
5
S
TA = 25°C, VS = ±15V, VCM = VO = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
200
200
575
675
µV
µV
OS
MS8 Package
I
I
Input Bias Current
Input Offset Current
25
20
1000
100
pA
pA
B
OS
A
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V = ±10V, R = 100k
100
–15
100
96
360
V/mV
V
dB
dB
V
V
VOL
O
L
21
CMRR
PSRR
V
V
= –15V to 14V
120
120
–14.85
–14.75
CM
V = ±5V to ±15V
S
R = 1M
–14.70
–14.50
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
R = 1M
R = 100k
L
14.78
14.62
14.89
14.81
V
V
OH
L
I
I
Short-Circuit Current
Supply Current per Amplifier
0.7
1.5
1.4
mA
µA
SC
2.0
S
5
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, VS = ±15V, VCM = VO = 0V, unless
otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
225
225
625
725
µV
µV
OS
MS8 Package
I
I
A
Input Bias Current
Input Offset Current
●
●
●
●
●
●
250
20
240
1200
120
pA
pA
V/mV
V
dB
dB
B
OS
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V = ±10V, R = 100k
60
–14.8
98
VOL
O
L
21
CMRR
PSRR
V
V
= –14.8V to 14V
120
120
–14.84
–14.73
CM
V = ±5V to ±15V
94
S
R = 1M
●
●
–14.67
–14.46
V
V
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
R = 1M
R = 100k
L
●
●
14.76
14.58
14.88
14.79
V
V
OH
L
I
I
Short-Circuit Current
Supply Current per Amplifier
●
●
0.6
1.3
1.6
mA
µA
SC
2.4
S
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, VS = ±15V, VCM = VO = 0V, unless
otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
●
●
250
250
675
775
µV
µV
OS
MS8 Package
I
I
A
Input Bias Current
Input Offset Current
●
●
●
●
●
●
250
20
200
1700
170
pA
pA
V/mV
V
dB
dB
B
OS
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V = ±10V, R = 100k
50
–14.8
96
VOL
O
L
21
CMRR
PSRR
V
V
= –14.8V to 14V
114
120
–14.83
–14.72
CM
V = ±5V to ±15V
92
S
R = 1M
●
●
–14.66
–14.44
V
V
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
R = 1M
R = 100k
L
●
●
14.74
14.54
14.87
14.77
V
V
OH
L
I
I
Short-Circuit Current
Supply Current per Amplifier
●
●
0.4
1.1
2.0
mA
µA
SC
3.0
S
6
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C. VS = ±15V, VCM = VO = half supply,
unless otherwise noted. (Note 3)
LT1494H/LT1495H/LT1496H
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
275
3.8
0.3
70
MAX
1100
10
UNITS
µV
V
Input Offset Voltage
●
●
●
●
●
●
●
OS
I
I
Input Bias Current
Input Offset Current
nA
nA
V/mV
V
dB
dB
V
V
B
2
OS
A
Large-Signal Voltage Gain
Input Voltage Range
V = ±10V, R = 100k
O
21
–14.5
69
VOL
L
21
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V
= –14.5V to 14V
90
115
CM
V = ±5V to ±15V
89
S
V
R = 1M
●
●
–14.80
–14.69
–14.4
–14.2
OL
L
R = 100k
L
V
Output Voltage Swing HIGH
Supply Current per Amplifier
R = 1M
R = 100k
L
●
●
14.5
14.3
14.85
14.73
3
V
V
µA
OH
L
I
●
6
S
–40°C to 85°C but are not tested or QA sampled at these temperatures.
The LT1494I/LT1495I/LT1496I are guaranteed to meet specified
performance from –40°C to 85°C. The LT1494H/LT1495H/LT1496H are
guaranteed to meet specified performance from –40°C to 125°C.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1494C/LT1495C/LT1496C and LT1494I/LT1495I/LT1496I
are guaranteed functional over the operating temperature range of –40°C
to 85°C. The LT1494H/LT1495H/LT1496H are guaranteed functional over
the operating temperature range of –40°C to 125°C.
Note 4: This parameter is not 100% tested.
Note 5: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
Note 3: The LT1494C/LT1495C/LT1496C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1494C/LT1495C/LT1496C are
designed, characterized and expected to meet specified performance from
V = ±15V tests.
S
Note 6: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
V = ±15V tests.
S
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Input Offset Voltage
Supply Current vs Temperature
Minimum Supply Voltage
20
18
16
14
12
10
8
2.5
2.0
1.5
1.0
0.5
0
200
V
S
= 5V, 0V
LT1494/LT1495/
LT1496
150
100
5700 OP AMPS
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
V
S
= ±15V
50
0
V
S
= ±2.5V
6
4
2
0
–50
–400
0
200 300
400
–40 –20
0
20
40
60
80 100
1
2
3
4
5
–300 –200 –100
100
INPUT OFFSET VOLTAGE (µV)
TEMPERATURE (°C)
TOTAL SUPPLY VOLTAGE (V)
1495 G01
1495 G02
1495 G03
7
LT1494/LT1495/LT1496
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Voltage
vs Load Current (Output Low)
Input Bias Current
vs Common Mode Voltage
Output Saturation Voltage
vs Load Current (Output High)
1000
100
10
1000
100
10
300
200
100
1.5
V
= 5V, 0V
V
= 5V, 0V
V = 5V, 0V
S
S
S
T
T
= 85°C
= 25°C
A
A
T
= –40°C
A
T
= 85°C
A
T
= 25°C
A
T
= 85°C
A
T
= –40°C
T
= 25°C
A
A
T
= –40°C
A
T
= 25°C
A
0.5
T
= –40°C
T = 85°C
A
A
–0.5
0.1
1
10
100
1000
0.1
1
10
100
1000
2
3
6
7
–1
0
1
4
5
8
9
10
LOAD CURRENT (µA)
LOAD CURRENT (µA)
COMMON MODE VOLTAGE (V)
1495 G04
1495 G05
1495 G06
Gain and Phase Shift
vs Frequency
Noise Voltage Spectrum
Noise Current Spectrum
50
40
120
300
250
200
150
100
50
100
80
V
= ±2.5V
V = ±2.5V
S
V
= ±2.5V
S
S
100
80
30
PHASE
20
60
60
40
20
0
10
40
GAIN
0
20
–10
–20
–30
0
–20
–40
0
0.1
1
10
1
10
100
1
10
100
FREQUENCY (kHz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1495 G09
1495 G08
1495 G10
Gain Bandwidth and Phase
Margin vs Supply Voltage
0.1Hz to 10Hz
Output Voltage Noise
Capacitive Load Handling
80
70
60
50
40
30
20
10
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
70
60
50
40
30
20
10
0
V
= ±2.5V
V
V
= ±15V
CM
S
S
PHASE MARGIN
GBW
= 0V
A
= 1
V
A
= 5
V
A
= 10
V
20
SUPPLY VOLTAGE (V)
30
0
5
10
15
25
10
100
1000
10000
100000
TIME (1s/DIV)
CAPACITIVE LOAD (pF)
1495 G12
1495 G11
1495 G07
8
LT1494/LT1495/LT1496
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
Output Impedance vs Frequency
100
90
100
90
1000
V
= ±2.5V
V = ±2.5V
S
S
POSITIVE
SUPPLY
80
80
100
70
70
60
50
60
50
A
= 10
V
10
1
NEGATIVE
SUPPLY
40
30
20
10
0
40
30
20
10
0
A
= 1
V
0.1
0.01
0.01
0.1
1
10
0.01
0.1
1
10
0.1
1
10
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1495 G13
1495 G14
1495 G15
Open-Loop Gain
VS = 5V, 0V
Open-Loop Gain
Warm-Up Drift vs Time
VS = ±15V
40
30
20
15
10
5
80
60
V
S
= 5V, 0V
V
= ±15V
S
20
40
20
R
= 100k
V
= ±15V
= ±2.5V
L
S
10
R
= 1M
L
R
= 1M
L
0
0
0
–20
–40
–60
R
= 100k
L
V
S
–10
–20
–30
– 40
–5
–10
–15
–20
–80
1
2
4
0
5
6
–20 –15 –10 –5
0
5
10 15 20
0
20 40 60 80 100 120 140 160 180 200
TIME AFTER POWER-UP (SEC)
1495 G16
3
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1495 G17
1495 G18
Small-Signal Response
VS = 5V, 0V
Large-Signal Response
VS = 5V, 0V
Small-Signal Response
VS = ±15V
1495 G20
1495 G19
1495 G21
VS = 5V, 0V
VS = 5V, 0V
RL = 1M
CL = 100pF
VS = ±15V
R
L = 1M
R
L = 1M
CL = 100pF
CL = 100pF
9
LT1494/LT1495/LT1496
U
W U U
APPLICATIONS INFORMATION
Start-Up Characteristics
Reverse Battery
TheLT1494/LT1495/LT1496areprotectedagainstreverse
battery voltages up to 18V. In the event a reverse battery
condition occurs, the supply current is typically less than
100nA (inputs grounded and outputs open). For typical
single supply applications with ground referred loads and
feedback networks, no other precautions are required. If
the reverse battery condition results in a negative voltage
at either the input pins or output pin, the current into the
pin should be limited by an external resistor to less than
10mA.
Micropower op amps are sometimes not micropower
during start-up, wreaking havoc on low current supplies.
Intheworstcase,theremaynotbeenoughsupplycurrent
availabletotakethesystemuptonominalvoltages.Figure
1 is a graph of LT1495 supply current vs supply voltage
for the three limit cases of input offset that could occur
during start-up. The circuits are shown in Figure 2. One
circuitcreatesapositiveoffset,forcingtheoutputtocome
up saturated high. Another circuit creates a negative
offset, forcing the output to come up saturated low, while
thelastbringsuptheoutputathalfsupply.Inallcases,the
supply current is well behaved. Supply current is highest
with the output forced high, so if one amplifier is unused,
it is best to force the output low or at half supply.
Inputs
While the LT1494/LT1495/LT1496 will function normally
with its inputs taken above the positive supply, the com-
mon mode range does not extend beyond approximately
300mV below the negative supply at room temperature.
Thedevicewillnotbedamagediftheinputsaretakenlower
than 300mV below the negative supply as long as the cur-
rent out of the pin is limited to less than 10mA. However,
theoutputphaseisnotguaranteedandthesupplycurrent
will increase.
5
4
OUTPUT HIGH
3
2
OUTPUT LOW
Output
1
OUTPUT V /2
S
Thegraph,CapacitiveLoadHandling,showsamplifiersta-
bility with the output biased at half supply. If the output is
to be operated within about 100mV of the positive rail, the
allowable load capacitance is less. With this output volt-
age, theworstcaseoccursatAV =1andlightloads, where
the load capacitance should be less than 500pF with a 5V
supply and less than 100pF with a 30V supply.
0
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
1495 F01
Figure 1. Start-Up Characteristics
V
V
V
S
S
S
Rail-to-Rail Operation
V /2
+
–
+
–
+
S
The simplified schematic, Figure 3, details the circuit
design approach of the LT1494/LT1495/LT1496. The
amplifier topology is a three-stage design consisting of a
rail-to-rail input stage, that continues to operate with the
inputs above the positive rail, a folded cascode second
stage that develops most of the voltage gain, and a rail-to-
rail common emitter stage that provides the current gain.
–
1495 F02
OUTPUT HIGH
OUTPUT LOW
OUTPUT AT V /2
S
Figure 2. Circuits for Start-Up Characteristics
10
LT1494/LT1495/LT1496
U
W U U
APPLICATIONS INFORMATION
+
V
D1
D2
D3
D7
Q10
Q13
Q14
Q15
Q20
+
I
1
Q21
C1
+
+
–
IN
IN
OUT
+
Q1 Q2
Q3
Q4
Q7
(V ) – 0.8V
Q16
Q17
Q19
D4
D5
D6
Q11
Q5
0.5
Q6
0.5
Q12
0.5
0.5
Q18
Q22
+
R1
R2
I
2
Q9
Q8
1495 F03
Figure 3. Simplified Schematic
TheinputstageisformedbytwodiffampsQ1-Q2andQ3-
Q6.ForsignalswithacommonmodevoltagebetweenVEE
and (VCC – 0.8V), Q1 and Q2 are active. When the input
common mode exceeds (VCC – 0.8V), Q7 turns on,
diverting the current from diff amp Q1-Q2 to current
mirrorQ8-Q9.ThecurrentfromQ8biasesontheotherdiff
ampconsistingofPNP’sQ5-Q6andNPN’sQ3-Q4.Though
Q5-Q6 are driven from the emitters rather than the base,
the basic diff amp action is the same. When the common
modevoltageisbetween(VCC –0.8V)andVCC,devicesQ3
and Q4 act as followers, forming a buffer between the
amplifier inputs and the emitters of the Q5-Q6. If the
common mode voltage is taken above VCC, Schottky
diodesD1andD2reversebiasanddevicesQ3andQ4then
act as diodes. The diff amp formed by Q5-Q6 operates
normally, however, the input bias current increases to the
emitter current of Q5-Q6, which is typically 180nA. The
graph, Input Bias Current vs Common Mode Voltage
found in the Typical Performance Characteristics section,
shows these transitions at three temperatures.
Thecollectorcurrentsofthetwo-inputpairsarecombined
in the second stage consisting of Q11 to Q16, which
furnishes most of the voltage gain. Capacitor C1 sets the
amplifier bandwidth. The output stage is configured for
maximum swing by the use of common emitter output
devices Q21 and Q22. Diodes D4 to D6 and current source
Q15 set the output quiescent current.
11
LT1494/LT1495/LT1496
U
TYPICAL APPLICATIONS N
13µA, 0kHz to 10kHz Voltage to Frequency Converter
270k
10M*
3.9M*
20M
5V
–
+
390Ω
1/2
LT1495
3.9M
+
100k
562k*
5V
1µF
V
IN
–
0V TO 2.5V
LTC®1440
0.0082µF
+
1.2
REFERENCE
LTC1440
12pF
1N5712
1N4148
3.6M TYP
SELECT FOR 100Hz
360k
Q1: ZTX-849
AT V = 0.025V
IN
*1% METAL FILM
†
POLYSTYRENE
39k
10M
0V – 2.5V = 0kHz – 10kHz
†
0.05µF
100pF
OUTPUT
0kHz TO 10kHz
SUPPLY CURRENT = 6.2µA QUIESCENT
= 13.3µA AT f = 10kHz
15k
–
Q1
LINEARITY: ±0.03%
1/2
LT1495
PSRR (4.4V TO 36V): 10ppm/V
TEMPERATURE DRIFT: 250ppm/°C
+
1495 TA07
6µA, AV = 1000, Chopper Stabilized Amplifier
0.2µF
1µF
5V
φ1
φ2
1µF
+
φ2
1M
1/2
LT1495
INPUT
–
1M
1/2
LT1495
OUTPUT
–
10M
+
–5V
φ1
10k
10M
10k
10M
φ1
–
5V
GAIN: 1000
–
1/2
LTC1441
OFFSET: 1µV
0.047µF
DRIFT: 50nV/°C
+
1/2
LTC1441
φ2
SUPPLY CURRENT: 5.5µA
BANDWIDTH: 0.2Hz
CLOCK RATE: 4Hz
10M
10M
+
–5V
1495 TA08
CD4016 QUAD
12
LT1494/LT1495/LT1496
U
TYPICAL APPLICATIONS N
Filter Frequency Response
6th Order 10Hz Elliptic Lowpass Filter
0
10k
100k
15nF
215k
15nF
100nF
–10
e
+
in
215k
30nF
–20
–30
–40
–50
–60
1/2 LT1495
215k
100nF
100k
–
200k
10nF
V
S
= 5V, 0V
I
= 2µA + e /150k
S
in
ZEROS AT 50Hz AND 60Hz
10k
1
10
100
1000
80.6k
FREQUENCY (Hz)
15nF
169k
15nF
100nF
LT1495/96 • TA04
+
169k
30nF
OUTPUT
1/2 LT1495
169k
100nF
100k
–
200k
10nF
1495 TA03
U
PACKAGE DESCRIPTION
MS8 Package
8-Lead Plastic MSOP
(Reference 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
0.043
(1.10)
MAX
0.034
(0.86)
REF
0.007
(0.18)
0° – 6° TYP
SEATING
PLANE
0.009 – 0.015
(0.22 – 0.38)
0.021 ± 0.006
(0.53 ± 0.015)
0.005 ± 0.002
(0.13 ± 0.05)
0.0256
(0.65)
BSC
MSOP (MS8) 1100
* 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
13
LT1494/LT1495/LT1496
U
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference 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
(
)
–0.381
N8 1098
*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 .150 Inch)
(Reference 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)
SO8 1298
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
14
LT1494/LT1495/LT1496
U
PACKAGE DESCRIPTION
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
14
13
12
11
10
9
8
7
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
5
6
4
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.020
(0.508)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.325
0.005
(0.125)
MIN
–0.015
0.125
(3.175)
MIN
0.018 ± 0.003
+0.889
8.255
(0.457 ± 0.076)
0.100
(
)
–0.381
(2.54)
BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N14 1098
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
14
13
12
11
10
9
8
0.228 – 0.244
0.150 – 0.157**
(5.791 – 6.197)
(3.810 – 3.988)
1
2
3
4
5
6
7
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)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
0.016 – 0.050
(0.406 – 1.270)
S14 1298
*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
LT1494/LT1495/LT1496
U
TYPICAL APPLICATIONS N
0nA to 200nA Current Meter
Battery Current Monitor
100pF
I
L
R
SENSE
0.1Ω
CHARGE
R1
12V
DISCHARGE
R
10M
5V
R
R4
A
A
–
–
10k
–
1/2
LT1495
1.5V
–
A2
A1
1/2 LT1495
1/2 LT1495
1/2
LT1495
R
R
INPUT
CURRENT
A
A
+
+
+
R2
9k
+
1.5V
R3
2N3904
DISCHARGE
2N3904
CHARGE
I
= 3µA WHEN I = 0
IN
S
2k
R
R
NO ON/OFF SWITCH
REQUIRED
B
A
FULL-SCALE
ADJUST
V
= I
R
SENSE
O
L
(
)
OUT
OUT
FOR R = 1k, R = 10k
R
R
A
B
B
B
0µA TO
200µA
µA
V
O
L
= 1V/A
1495 TA06
I
1495 TA05
High Side Current Sense
V
= 2.7V TO 36V
S
R
B
R
A
V
= I
R
S
O
L
(R )
1k
A
–
+
FOR R = 1k, R = 10k, R = 1Ω
A
B
S
R
SENSE
1Ω
V
LT1494
O
L
= 10 V/A
I
OUTPUT OFFSET ≈ I • R ≈ 10mV
OUTPUT CLIPS AT V – 2.4V
+
S
S
B
R
B
I
V
O
L
LOAD
10k
_
1495 TA09
RELATED PARTS
PART NUMBER
LTC®1440/41/42
LTC1443/44/45
DESCRIPTION
COMMENTS
Micropower Single/Dual Comparators with 1% Reference
Micropower Quad Comparators with 1% Reference
LTC1440: Single, LTC1441/42: Dual
LTC1443: 1.182 Reference
LTC1444/45: 1.221V Reference and Adjustable Hysteresis
LT1466/LT1467
LT1490A/LT1491A
LTC1540
75µA Dual/Quad Rail-to-Rail Input and Output Op Amps
50µA Dual/Quad Rail-to-Rail Input and Output Op Amps
Nanopower Single Comparator with 1% Reference
390µV V
950µV V
, Gain Bandwidth = 120kHz
, Gain Bandwidth = 200kHz
OS(MAX)
OS(MAX)
350nA Supply Current
225µV V , I = 55µA (MAX), Gain-Bandwidth = 200kHz
LT1636
Single Over-The-Top Micropower,
OS(MAX)
S
Rail-to-Rail Input and Output Op Amp
Shutdown Pin, MSOP
LT1672/LT1673/LT1674
2µA MAX, A ≥ 5 Single/Dual/Quad Over-The-Top Precision
Decompensated Version of the LT1494/LT1495/LT1496
A ≥ 5, Gain-Bandwidth = 12kHz
V
V
Rail-to-Rail Input and Output Op Amps
55µA Dual/Quad Single Supply Op Amps
17µA Dual/Quad Single Supply Op Amps
LT2078/LT2079
LT2178/LT2179
LT1782
120µV V
120µV V
, Gain Bandwidth = 200kHz
, Gain Bandwidth = 60kHz
OS(MAX)
OS(MAX)
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 in SOT-23
SOT-23, 800µV V , I = 300µA (Max),
Gain-Bandwidth = 1.2MHz, Shutdown Pin
OS(MAX)
S
149456fb LT/TP 0801 1.5K REV B • PRINTED IN USA
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
16
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear.com
LINEAR TECHNOLOGY CORPORATION 1997
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Linear
LT1495HS8
1.5UA Max, Single, Dual and Quad Over-The-Top Precision Rail-to-Rail Input and Output Op Amps
Linear
LT1495HS8#TR
LT1495 - 1.5uA Max, Single, Dual and Quad Precision Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 125°C
Linear
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