LTC1049
Low Power Zero-Drift
Operational Amplifier
with Internal Capacitors
FEATURES
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DESCRIPTIO
Low Supply Current: 200µA
No External Components Required
Maximum Offset Voltage: 10µV
Maximum Offset Voltage Drift: 0.1µV/°C
Single Supply Operation: 4.75V to 16V
Input Common Mode Range Includes Ground
Output Swings to Ground
Typical Overload Recovery Time: 6ms
Available in 8-Pin SO and PDIP Packages
The LTC
®
1049 is a high performance, low power zero-drift
operational amplifier. The two sample-and-hold capacitors
usually required externally by other chopper stabilized
amplifiers are integrated on the chip. Further, the LTC1049
offers superior DC and AC performance with a nominal
supply current of only 200µA.
The LTC1049 has a typical offset voltage of 2µV, drift of
0.02µV/°C, 0.1Hz to 10Hz input noise voltage of 3µV
P-P
and typical voltage gain of 160dB. The slew rate is 0.8V/µs
with a gain bandwidth product of 0.8MHz.
Overload recovery time from a saturation condition is
6ms, a significant improvement over chopper amplifiers
using external capacitors.
The LTC1049 is available in a standard 8-pin plastic dual
in line, as well as an 8-pin SO package. The LTC1049 can
be a plug-in replacement for most standard op amps with
improved DC performance and substantial power savings.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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4mA to 20mA Current Loops
Thermocouple Amplifiers
Electronic Scales
Medical Instrumentation
Strain Gauge Amplifiers
High Resolution Data Acquisition
TYPICAL APPLICATIO
Single Supply Thermocouple Amplifier
0.068µF
V
IN
= 5V
246k
1k
2
K
LT 1025A
GND
4
R
–
5
®
2
3
–
+
7
6
V
OUT
= 0V TO 4V
FOR 0°C TO 400°C
LTC1049
7
–
+
4
0.1µF
TYPE K
SUPPLY CURRENT = 280µA
U
LTC1049 • TA01
U
U
1049fb
1
LTC1049
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V
+
to V
–
) ............................... 18V
Input Voltage (Note 2) .......... (V
+
+ 0.3V) to (V
–
– 0.3V)
Output Short-Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC 1
–IN 2
+IN 3
V
–
4
8
7
6
5
NC
V
+
ORDER PART
NUMBER
LTC1049CN8
+IN 2
V
–
3
4
NC
N8 PACKAGE 8-LEAD PDIP
T
JMAX
= 110°C,
θ
JA
= 130°C/W
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/W
LTC1049CJ8
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 110°C,
θ
JA
= 200°C/W
OBSOLETE PACKAGE
Consider the N8 Package as an Alternate Source
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Offset Voltage
Average Input Offset Drift
Long Term Offset Voltage Drift
Input Offset Current
Input Bias Current
CONDITIONS
(Note 3)
(Note 3)
The
●
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V,
unless noted.
MIN
●
●
●
Input Noise Voltage
Input Noise Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
0.1Hz to 10Hz
0.1Hz to 1Hz
f = 10Hz (Note 4)
V
CM
= V
–
to 2.7V
V
S
=
±2.375V
to
±8V
R
L
= 100kΩ, V
OUT
=
±4.75V
R
L
= 10kΩ
R
L
= 100kΩ
R
L
= 10kΩ, C
L
= 50pF
No Load
●
●
●
●
●
Slew Rate
Gain Bandwidth Product
Supply Current
Internal Sampling Frequency
●
2
+
–
OUT
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
NC
–IN 1
TOP VIEW
8
7
6
5
NC
V
+
OUT
NC
ORDER PART
NUMBER
LTC1049CS8
S8 PART MARKING
1049
TYP
±2
±0.02
50
±30
±15
3
1
2
130
130
160
–4.9/4.2
±4.97
0.8
0.8
200
700
MAX
±10
±0.1
±100
±150
±50
±150
110
110
130
–4.6/3.2
±4.9
330
495
UNITS
µV
µV/°C
nV√mo
pA
pA
pA
pA
µV
P-P
µV
P-P
fA√Hz
dB
dB
dB
V
V
V
V/µs
MHz
µA
µA
Hz
1049fb
LTC1049
ELECTRICAL CHARACTERISTICS
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Connecting any terminal to voltages greater than V
+
or less than
V
–
may cause destructive latch-up. It is recommended that no sources
operating from external supplies be applied prior to power-up of the
LTC1049.
Note 3:
These parameters are guaranteed by design. Thermocouple effects
preclude measurement of these voltage levels in high speed automatic test
systems. V
OS
is measured to a limit determined by test equipment
capability.
Note 4:
Current Noise is calculated from the formula:
I
N
=
√(2q
• I
b
)
where q = 1.6 • 10
–19
Coulomb.
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Noise vs Frequency
140
120
COMMON MODE VOLTAGE (V)
VOLTAGE NOISE (nV/√Hz)
VOLTAGE GAIN (dB)
100
80
60
40
20
10
100
1k
FREQUENCY (Hz)
LTC1049 • TP01
10k
Supply Current vs Supply Voltage
500
400
SHORT-CIRCUIT OUTPUT CURRENT (mA)
SUPPLY CURRENT (µA)
340
280
220
160
100
5
6
7 8 9 10 11 12 13 14 15
TOTAL SUPPLY VOLTAGE (V)
LTC1049 • TPC04
SUPPLY CURRENT (µA)
U W
Common Mode Input Range vs
Supply Voltage
8
6
4
2
0
–2
–4
–6
–8
100k
Gain/Phase vs Frequency
120
V
S
=
±
5V
NO LOAD
100
80
PHASE
60
40
GAIN
20
0
–20
160
180
200
1k
10k
100k
FREQUENCY (Hz)
1M
220
10M
LTC1049 • TPC03
V
CM
= V
–
60
80
PHASE SHIFT (DEGREES)
100
120
140
0
1
4
5
2
3
6
SUPPLY VOLTAGE (±V)
7
8
–40
100
LTC1049 • TPC02
Supply Current vs Temperature
1.2
0.8
0.4
0
–3
–6
–9
Output Short-Circuit Current vs
Supply Voltage
400
300
≈
≈
200
100
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
4
14
8
10
12
6
+
TO V
–
(V)
TOTAL SUPPLY VOLTAGE, V
16
LTC1049 • TPC05
LTC1049 • TPC06
1049fb
3
LTC1049
TYPICAL PERFOR A CE CHARACTERISTICS
Sampling Frequency vs
Supply Voltage
3000
5
2500
SAMPLING FREQUENCY (kHz)
SAMPLING FREQUENCY (Hz)
2000
CMRR (dB)
1500
1000
4
14
16
6
8
10
12
TOTAL SUPPLY VOLTAGE, V
+
TO V
–
(V)
LTC1049 • TPC07
Overload Recovery
400mV
0.2V/DIV
0V
0V
2V/DIV
–5V
A
V
= –100
V
S
=
±5V
0.5ms/DIV
LTC1049 • TPC10
V
S
=
±
5V
NOISE VOLTAGE
1µV/DIV
4
U W
Sampling Frequency vs
Temperature
V
S
=
±
5V
CMRR vs Frequency
160
140
V
S
=
±
5V
4
120
3
100
80
60
40
20
2
1
0
50
25
0
75 100
–50 –25
AMBIENT TEMPERATURE (°C)
125
0
1
10
100
1k
FREQUENCY (Hz)
10k
100k
LTC1049 • TPC08
LTC1049 • TPC09
Small-Signal Transient
Response
Large-Signal Transient
Response
INPUT
OUTPUT
100mV
STEP
6V
STEP
1µs/DIV
5µs/DIV
A
V
= 1
R
L
= 10k
C
L
= 50pF
V
S
=
±5V
LTC1049 • TPC11
A
V
= 1
R
L
= 10k
C
L
= 50pF
V
S
=
±5V
LTC1049 • TPC12
LTC1049 DC to 1Hz Noise
1Hz NOISE
1µV/DIV
10s/DIV
LTC1049 • TPC13
1049fb
LTC1049
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1049 DC to 10Hz Noise
V
S
=
±
5V
NOISE VOLTAGE
1µV/DIV
TEST CIRCUITS
Electrical Characteristics Test Circuit
140
120
COMMON MODE VOLTAGE (V)
VOLTAGE NOISE (nV/√Hz)
100
80
60
40
20
10
100
1k
FREQUENCY (Hz)
LTC1049 • TP01
U W
10Hz NOISE
1µV/DIV
1s/DIV
LTC1049•TPC14
DC to 10Hz and DC to 1Hz Noise Test Circuit
8
6
4
2
0
–2
–4
–6
–8
V
CM
= V
–
10k
100k
0
1
4
5
2
3
6
SUPPLY VOLTAGE (±V)
7
8
LTC1049 • TPC02
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5
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