LT1495 [Linear]
1.5uA Max, Dual and Quad Precision Rail-to-Rail Input and Output Op Amps; 1.5uA最大,双路和四路精密轨至轨输入和输出运算放大器型号: | LT1495 |
厂家: | Linear |
描述: | 1.5uA Max, Dual and Quad Precision Rail-to-Rail Input and Output Op Amps |
文件: | 总12页 (文件大小:317K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1495/LT1496
1.5µA Max, Dual and Quad
Precision Rail-to-Rail
Input and Output Op Amps
U
FEATURES
DESCRIPTION
TheLT®1495/LT1496arethelowestpower(IS ≤ 1.5µA)op
amps with precision specifications. The extremely low
supply current is combined with excellent amplifier speci-
fications: input offset voltage is 375µV maximum with a
typical drift of only 0.4µV/°C, input offset current is 100pA
maximum.Aminimumopen-loopgain(AVOL)of100V/mV
ensures that gain errors are small. The device character-
istics change little over the supply range of 2.2V to ±15V.
Supply rejection is 90dB and the common mode rejection
ratio is 90dB. Operation is specified for 3V, 5V and ±15V
supplies. Reverse battery protection (–18V min) and
inputs that operate above the positive supply make the
LT1495/LT1496 easy to use in harsh environments.
■
Low Supply Current: 1.5µA Max
Rail-to-Rail Input and Output
■
■
■
■
■
■
■
■
■
Low Offset Voltage: 375µV Max
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
APPLICATIONS
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 LT1495 is available in plastic 8-pin PDIP and SO-8
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.
U
TYPICAL APPLICATION
TC VOS Distribution
Micropower Integrating Current Sense
30
RESET
100 AMPLIFIERS
V
= ±2.5V
S
25
20
15
10
5
0.1µF
–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
1495 TA02
OUTPUT SWITCHES
WHEN I dt = 0.98 V
L
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
LT1495/LT1496
W W
U W
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to V–) .............................. 36V
Input Differential Voltage ......................................... 36V
Input Current ...................................................... ±10mA
Output Short-Circuit Duration.......................Continuous
Operating Temperature Range ................ –40°C to 85°C
Specified Temperature Range (Note 1) ... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Junction Temperature........................................... 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U
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PACKAGE/ORDER INFORMATION
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NUMBER
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
LT1496CN
LT1496CS
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
S8 PART MARKING
1495
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
8
OUT B
S PACKAGE
14-LEAD PLASTIC SO
N PACKAGE
14-LEAD PDIP
TJMAX = 150°C, θJA = 130°C/ W (N8)
JMAX = 150°C, θJA = 190°C/ W (S8)
T
TJMAX = 150°C, θJA = 110°C/ W (N8)
JMAX = 150°C, θJA = 150°C/ W (S8)
T
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
V = 5V
V = 3V
S
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
150
200
375
475
µV
µV
OS
S
I
I
Input Bias Current
(Note 3)
250
180
20
4
185
10
500
250
1000
360
100
pA
nA
pA
B
V
= 10V (Note 4)
CM
Input Offset Current
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Large-Signal Voltage Gain
(Note 3)
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
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
No Load
OL
I
= 100µA
210
SINK
2
LT1495/LT1496
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
V – 0.07
V – 0.32
TYP
V – 0.035
V – 0.160
MAX
UNITS
+
+
V
OH
Output Voltage Swing HIGH
No Load
V
V
+
+
I
= 100µA
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
Reverse Supply Voltage
Slew Rate
(Note 3)
(Note 4)
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
0°C ≤ TA ≤ 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
V = 5V
V = 3V
S
MIN
TYP
175
225
MAX
425
525
UNITS
V
OS
Input Offset Voltage
●
●
µV
µV
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 2)
(Note 3)
●
0.4
250
240
20
280
150
2
µV/°C
OS
I
I
●
●
1200
500
120
pA
nA
pA
V/mV
V/mV
B
V
CM
= 10V (Note 4)
Input Offset Current
Large-Signal Voltage Gain
(Note 3)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
OS
A
VOL
●
●
75
40
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
= 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
OL
V
OH
No Load
●
●
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 3)
(Note 4)
●
●
0.6
1.1
1.2
mA
µA
SC
1.8
S
–40°C ≤ TA ≤ 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted. (Note 1)
SYMBOL PARAMETER
CONDITIONS
V = 5V
V = 3V
S
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
●
●
200
250
475
575
µV
µV
S
V
TC
Input Offset Voltage Drift
Input Bias Current
(Note 2)
(Note 3)
●
0.4
250
275
20
215
115
2
µV/°C
OS
I
I
●
●
1700
pA
nA
pA
V/mV
V/mV
B
V
CM
= 10V (Note 4)
Input Offset Current
Large-Signal Voltage Gain
(Note 3)
V = 5V, V = 0.25V to 4.5V, R = 100k
●
170
36
OS
A
VOL
●
●
55
30
0
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
●
●
88
106
75
99
dB
dB
dB
V
CM
CM
S
= 0.2V to 10V, V = 5V
S
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
V = 2.7V to 12V, V = V = 0.5V
S
●
●
88
CM
O
2.6
2.7
3
LT1495/LT1496
ELECTRICAL CHARACTERISTICS
–40°C ≤ TA ≤ 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted. (Note 1)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Output Voltage Swing LOW
No Load
●
●
60
245
V – 0.05
V – 0.19
120
490
mV
mV
mV
mV
OL
OH
I
= 100µA
SINK
+
+
V
Output Voltage Swing HIGH
No Load
= 100µA
●
●
V – 0.10
+
+
I
V – 0.38
SOURCE
I
I
Short-Circuit Current
Supply Current per Amplifier
(Note 3)
(Note 4)
●
●
0.4
0.9
1.5
mA
µA
SC
2.3
S
TA = 25°C, VS = ±15V, VCM = VO = 0V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
MIN
TYP
200
25
MAX
575
1000
100
UNITS
µV
V
OS
Input Offset Voltage
I
I
Input Bias Current
Input Offset Current
pA
pA
B
20
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
CM
= –15V to 14V
120
120
–14.85
–14.75
V = ±5V to ±15V
S
V
OL
R = 1M
–14.70
–14.50
L
R = 100k
L
V
OH
Output Voltage Swing HIGH
R = 1M
R = 100k
L
14.78
14.62
14.89
14.81
V
V
L
I
I
Short-Circuit Current
Supply Current per Amplifier
0.7
1.5
1.4
mA
µA
SC
2.0
S
0°C ≤ TA ≤ 70°C, VS = ±15V, VCM = VO = 0V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
MIN
TYP
225
250
20
MAX
625
1200
120
UNITS
µV
V
OS
Input Offset Voltage
●
●
●
●
●
●
●
I
I
Input Bias Current
Input Offset Current
pA
pA
V/mV
V
dB
dB
V
V
B
OS
A
VOL
Large-Signal Voltage Gain
Input Voltage Range
V = ±10V, R = 100k
60
–15
98
240
O
L
21
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V
= –14.8V to 14V
120
120
–14.84
–14.73
CM
V = ±5V to ±15V
94
S
V
OL
R = 1M
●
●
–14.67
–14.46
L
R = 100k
L
V
OH
Output Voltage Swing HIGH
R = 1M
R = 100k
L
●
●
14.76
14.58
14.88
14.79
V
mV
L
I
I
Short-Circuit Current
Supply Current per Amplifier
●
●
0.6
1.3
1.6
mA
µA
SC
2.4
S
4
LT1495/LT1496
ELECTRICAL CHARACTERISTICS
–40°C ≤ TA ≤ 85°C, VS = ±15V, VCM = VO = 0V, unless otherwise noted. (Note 1)
SYMBOL PARAMETER CONDITIONS
MIN
TYP
250
250
20
MAX
675
1700
170
UNITS
µV
V
OS
Input Offset Voltage
●
●
●
●
●
●
●
I
I
Input Bias Current
Input Offset Current
pA
pA
V/mV
V
dB
dB
V
V
B
OS
A
VOL
Large-Signal Voltage Gain
Input Voltage Range
V = ±10V, R = 100k
O
50
–15
96
200
L
21
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
V
= –14.8V to 14V
114
120
–14.83
–14.72
CM
V = ±5V to ±15V
92
S
V
OL
R = 1M
●
●
–14.66
–14.44
L
R = 100k
L
V
OH
Output Voltage Swing HIGH
R = 1M
R = 100k
L
●
●
14.74
14.54
14.87
14.77
V
V
L
I
I
Short-Circuit Current
Supply Current per Amplifier
●
●
0.4
1.1
2.0
mA
µA
SC
3.0
S
Note 2: This parameter is not 100% tested.
Note 3: V = 5V limit guaranteed by correlation to V = 3V and V = ±15V
The
● denotes specifications which apply over the full operating
temperature range.
S
S
S
tests.
Note 1: The LT1495/LT1496 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 4: V = 3V limit guaranteed by correlation to V = 5V and V = ±15V
tests.
S
S
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
LT1495/LT1496
4500 OP AMPS
150
100
T
= 25°C
A
T
A
= –40°C
T
= 85°C
V
S
= ±15V
A
50
0
V
= ±2.5V
S
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
5
LT1495/LT1496
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Input Bias Current
vs Common Mode Voltage
Output Saturation Voltage
vs Load Current (Output Low)
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
S
V
= 5V, 0V
S
S
T
T
= 85°C
= 25°C
A
A
T
= –40°C
A
T
A
= 85°C
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
A
= –40°C
T = 85°C
A
–0.5
0.1
1
10
100
1000
0.1
1
10
100
1000
–1
0
1
2
3
4
5
6
7
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
S
= ±2.5V
V
= ±2.5V
V
S
= ±2.5V
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
V
= 5
A
= 10
V
20
SUPPLY VOLTAGE (V)
30
10
100
1000
10000
100000
0
5
10
15
25
TIME (1s/DIV)
CAPACITIVE LOAD (pF)
1495 G12
1495 G11
1495 G07
6
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
100
V
= ±2.5V
V
= ±2.5V
S
S
POSITIVE
SUPPLY
80
80
70
70
60
50
60
50
A
= 10
V
10
1
NEGATIVE
SUPPLY
40
30
20
10
0
40
30
20
10
0
A
V
= 1
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 G14
1495 G13
1495 G15
Open-Loop Gain
VS = 5V, 0V
Open-Loop Gain
VS = ±15V
Warm-Up Drift vs Time
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
L
= 100k
V
S
–10
–20
–30
– 40
–5
–10
–15
–20
–80
1
2
4
–20 –15 –10 –5
0
5
10 15 20
0
5
6
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 = ±15V
VS = 5V, 0V
R
L = 1M
R
L = 1M
RL = 1M
CL = 100pF
CL = 100pF
CL = 100pF
7
LT1495/LT1496
U
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APPLICATIONS INFORMATION
Start-Up Characteristics
Reverse Battery
TheLT1495/LT1496areprotectedagainstreversebattery
voltages up to 18V. In the event a reverse battery condi-
tionoccurs,thesupplycurrentistypicallylessthan100nA
(inputsgroundedandoutputsopen).Fortypicalsinglesup-
ply applications with ground referred loads and feedback
networks,nootherprecautionsarerequired.Ifthereverse
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 LT1495/LT1496 will function normally with its
inputstakenabovethepositivesupply,thecommonmode
range does not extend beyond approximately 300mV be-
low the negative supply at room temperature. The device
will not be damaged if the inputs are taken lower than
300mV below the negative supply as long as the current
out of the pin is limited to less than 10mA. However, the
outputphaseisnotguaranteedandthesupplycurrentwill
increase.
5
4
OUTPUT HIGH
3
2
Output
OUTPUT LOW
1
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.
OUTPUT V /2
S
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
The simplified schematic, Figure 3, details the circuit
design approach of the 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 com-
mon emitter stage that provides the current gain.
V /2
+
–
+
–
+
S
–
1495 F02
OUTPUT HIGH
OUTPUT LOW
OUTPUT AT V /2
S
Figure 2. Circuits for Start-Up Characteristics
8
LT1495/LT1496
U
W U U
APPLICATIONS INFORMATION
D1
D2
D3
D7
Q10
Q13
Q14
Q15
Q20
+
I
1
Q21
OUT
C1
+
+
–
IN
IN
+
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.
The collector currents of the two-input pairs are combined
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.
9
LT1495/LT1496
TYPICAL APPLICATIONS N
U
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.µ3A 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
10k
+
–5V
φ1
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
10
LT1495/LT1496
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
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
8
1
7
6
5
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.125
0.005
(0.127)
MIN
0.015
(0.380)
MIN
(3.175)
MIN
0.325
2
4
3
–0.015
+0.635
8.255
N8 0695
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
(
)
–0.381
*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)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 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
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
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 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
0.130 ± 0.005
(3.302 ± 0.127)
(1.143 – 1.651)
14
13
12
11
10
9
8
7
0.015
(0.380)
MIN
0.255 ± 0.015*
(6.477 ± 0.381)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
(3.175)
MIN
+0.025
1
2
3
5
6
4
0.325
0.005
(0.125)
MIN
–0.015
0.018 ± 0.003
N14 0695
+0.635
8.255
(0.457 ± 0.076)
(
)
–0.381
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)
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
0.010 – 0.020
(0.254 – 0.508)
14
13
12
11
10
9
8
× 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
0.228 – 0.244
0.150 – 0.157**
(5.791 – 6.197)
0.050
(1.270)
TYP
(3.810 – 3.988)
0.014 – 0.019
(0.355 – 0.483)
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
*
**
1
2
3
4
5
6
7
S14 0695
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
LT1495/LT1496
U
TYPICAL APPLICATIONS N
0nA to 200nA Current Meter
Battery Current Monitor
I
100pF
L
R
SENSE
0.1Ω
CHARGE
R1
10M
12V
DISCHARGE
5V
R
R
R
A
A
R4
–
+
–
–
10k
1/2
LT1495
1.5V
A2
A1
–
1/2 LT1495
1/2 LT1495
+
R
A
1/2
LT1495
INPUT
A
+
CURRENT
R2
9k
+
1.5V
R3
2N3904
DISCHARGE
2N3904
I
= 3µA WHEN I = 0
IN
S
2k
R
R
B
A
NO ON/OFF SWITCH
REQUIRED
CHARGE
OUT
FULL-SCALE
ADJUST
V
= I
R
SENSE
O
L
(
)
OUT
FOR R = 1k, R = 10k
R
B
R
A
B
B
0µA TO
200µA
µA
V
O
L
= 1V/A
1495 TA06
I
1495 TA05
6th Order 10Hz Elliptic Lowpass Filter
Filter Frequency Response
0
–10
–20
–30
–40
–50
–60
10k
100k
15nF
215k
15nF
100nF
e
+
in
215k
1/2 LT1495
215k
100nF
100k
30nF
–
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
RELATED PARTS
PART NUMBER
LTC1440/41/42
LTC1443/44/45
DESCRIPTION
COMMENTS
Micropower Single/Dual Comparators with 1% Reference LTC1440: Single, LTC1441/42: Dual
Micropower Quad Comparators with 1% Reference
LTC1443: 1.182 Reference
LTC1444/45: 1.221V Reference and Adjustable Hysteresis
LT1466/LT1467
LT1490/LT1491
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
55µA Dual/Quad Single Supply Op Amps
390µV V
950µV V
, Gain Bandwidth = 120kHz
, Gain Bandwidth = 200kHz
OS(MAX)
OS(MAX)
350nA Supply Current
LT2078/LT2079
LT2178/LT2179
120µV V
120µV V
, Gain Bandwidth = 200kHz
, Gain Bandwidth = 60kHz
OS(MAX)
17µA Dual/Quad Single Supply Op Amps
OS(MAX)
14956f LT/TP 0697 5K • PRINTED IN USA
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
12
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1997
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