LTC1050
Precision Zero-Drift
Operational Amplifier
with Internal Capacitors
DESCRIPTIO
The LTC
®
1050 is a high performance, low cost zero-drift
operational amplifier. The unique achievement of the
LTC1050 is that it integrates on-chip the two sample-and-
hold capacitors usually required externally by other chop-
per amplifiers. Further, the LTC1050 offers better com-
bined overall DC and AC performance than is available
from other chopper stabilized amplifiers with or without
internal sample-and-hold capacitors.
The LTC1050 has an offset voltage of 0.5µV, drift of
0.01µV/°C, DC to 10Hz, input noise voltage of 1.6µV
P-P
and a typical voltage gain of 160dB. The slew rate of 4V/µs
and a gain bandwidth product of 2.5MHz are achieved with
only 1mA of supply current.
Overload recovery times from positive and negative satu-
ration conditions are 1.5ms and 3ms respectively, which
represents an improvement of about 100 times over chop-
per amplifiers using external capacitors. Pin 5 is an optional
external clock input, useful for synchronization purposes.
The LTC1050 is available in standard 8-pin metal can,
plastic and ceramic dual-in-line packages as well as an
SO-8 package. The LTC1050 can be an improved plug-in
replacement for most standard op amps.
FEATURES
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No External Components Required
Noise Tested and Guaranteed
Low Aliasing Errors
Maximum Offset Voltage: 5µV
Maximum Offset Voltage Drift: 0.05µV/°C
Low Noise: 1.6µV
P-P
(0.1Hz to 10Hz)
Minimum Voltage Gain: 130dB
Minimum PSRR: 125dB
Minimum CMRR: 120dB
Low Supply Current: 1mA
Single Supply Operation: 4.75V to 16V
Input Common Mode Range Includes Ground
Output Swings to Ground
Typical Overload Recovery Time: 3ms
APPLICATIO S
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Thermocouple Amplifiers
Electronic Scales
Medical Instrumentation
Strain Gauge Amplifiers
High Resolution Data Acquisition
DC Accurate RC Active Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V
4
1/2 LTC1043
7
8
3
High Performance, Low Cost Instrumentation Amplifier
160
5V
VOLTAGE NOISE DENSITY (nV/√Hz)
140
120
100
80
60
40
20
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1050 TA02
+
–
7
6
V
OUT
LTC1050
2
11
DIFFERENTIAL
INPUT
12
R1
13
16
0.01µF
14
R2
C
S
1µF
C
H
1µF
4
– 5V
1µF
1050 TA01
17
– 5V
CMRR > 120dB AT DC
CMRR > 120dB AT 60Hz
DUAL SUPPLY OR SINGLE 5V
GAIN = 1 + R2/R1
V
OS
= 5µV
COMMON MODE INPUT VOLTAGE EQUALS THE SUPPLIES
U
U
U
Noise Spectrum
1050fb
1
LTC1050
ABSOLUTE
AXI U
RATI GS
(Note 1)
Operating Temperature Range
LTC1050AC/C .................................. – 40°C to 85°C
LTC1050H ..................................... – 40°C to 125°C
LTC1050AM/M
(OBSOLETE)
.......... – 55°C to 125°C
Total Supply Voltage (V
+
to V
–
) .............................. 18V
Input Voltage ........................ (V
+
+ 0.3V) to (V
–
– 0.3V)
Output Short-Circuit Duration ......................... Indefinite
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC
8
NC 1
–IN 2
+IN 3
4
–
ORDER PART
NUMBER
7 V
+
(CASE)
6 OUT
5 EXT CLOCK
INPUT
–IN 2
+IN 3
V
–
4
V
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 150°C
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
OBSOLETE PACKAGE
TOP VIEW
NC 1
–IN 2
+IN 3
V
–
8
7
6
5
N8 PACKAGE
8-LEAD PDIP
NC
V
+
OUT
EXT CLOCK
INPUT
ORDER PART
NUMBER
NC
1
2
3
4
5
6
7
TOP VIEW
14 NC
13 NC
12 NC
11 V
+
10 OUT
9
8
N PACKAGE
14-LEAD PDIP
NC
NC
LTC1050ACN8
LTC1050CN8
LTC1050ACJ8
LTC1050CJ8
LTC1050AMJ8
LTC1050MJ8
NC
NC
–IN
+IN
NC
V
–
4
T
JMAX
= 150°C,
θ
JA
= 100°C/W
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/W
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
T
JMAX
= 150°C,
θ
JA
= 70°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V
PARAMETER
Input Offset Voltage
Average Input Offset Drift
Long Term Offset Voltage Drift
Input Offset Current
Input Bias Current
Input Noise Voltage
CONDITIONS
(Note 3)
(Note 3)
(Note 5)
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature
LTC1050AM
MIN
TYP
MAX
●
±0.5
±0.01
50
±20
±10
●
(Note 5)
●
0.1Hz to 10Hz (Note 6)
DC to 1Hz
2
–
+
LTC1050ACH
LTC1050CH
LTC1050AMH
LTC1050MH
U
U
W
W W
U
W
TOP VIEW
NC 1
8
7
6
5
NC
V
+
OUT
EXT CLOCK
INPUT
ORDER PART
NUMBER
LTC1050CS8
LTC1050HS8
S8 PART MARKING
1050
1050H
ORDER PART
NUMBER
LTC1050CN
LTC1050AC
MIN
TYP
MAX
±0.5
±0.01
50
±20
±10
1.6
0.6
±5
±0.05
±60
±150
±30
±100
2.1
UNITS
µV
µV/°C
nV/√Mo
pA
pA
pA
pA
µV
P-P
µV
P-P
1050fb
±5
±0.05
±60
±300
±30
±2000
2.1
1.6
0.6
LTC1050
range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V
PARAMETER
Input Noise Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
Gain Bandwidth Product
Supply Current
Internal Sampling Frequency
CONDITIONS
f = 10Hz (Note 4)
V
CM
= V
–
to 2.7V
V
S
=
±2.375V
to
±8V
R
L
= 10k, V
OUT
=
±4V
R
L
= 10k
R
L
= 100k
R
L
= 10k, C
L
= 50pF
No Load
●
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature
LTC1050AM
MIN
TYP
MAX
114
110
125
130
±
4.7
1.8
140
140
160
±4.85
±4.95
4
2.5
1
2.5
LTC1050AC
MIN
TYP
MAX
114
110
125
130
±4.7
1.8
140
140
160
±4.85
±4.95
4
2.5
1
2.5
UNITS
fA/√Hz
dB
dB
dB
dB
V
V
V/µs
MHz
mA
mA
kHz
●
●
●
●
1.5
2.3
1.5
2.3
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
S
=
±5V
PARAMETER
Input Offset Voltage
Average Input Offset Drift
Long Term Offset Voltage Drift
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Common Mode Rejection Ratio
CONDITIONS
(Note 3)
(Note 3)
(Note 5)
●
●
LTC1050M/H
MIN
TYP
MAX
±0.5
±0.01
50
±20
±10
●
LTC1050C
MIN
TYP
MAX
±0.5
±0.01
50
±20
±10
1.6
0.6
1.8
130
±5
±0.05
±125
±200
±75
±150
UNITS
µV
µV/°C
nV/√Mo
pA
pA
pA
pA
µV
P-P
µV
P-P
fA/√Hz
dB
dB
dB
dB
dB
dB
V
V
V/µs
MHz
mA
mA
kHz
±5
±0.05
±100
±300
±50
±2000
(Note 5)
R
S
= 100Ω, 0.1Hz to 10Hz (Note 6)
R
S
= 100Ω, DC to 1Hz
f = 10Hz (Note 4)
V
CM
= V
–
to 2.7V
LTC1050M/C
LTC1050H
V
S
=
±2.375V
to
±8V,
LTC1050M/C
LTC1050H
R
L
= 10k, V
OUT
=
±4V
R
L
= 10k
R
L
= 100k
R
L
= 10k, C
L
= 50pF
No Load
●
●
●
●
●
●
●
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
Gain Bandwidth Product
Supply Current
Internal Sampling Frequency
114
110
100
120
110
120
±
4.7
1.6
0.6
1.8
130
114
110
120
120
±4.7
140
160
±4.85
±4.95
4
2.5
1
2.5
140
160
±4.85
±4.95
4
2.5
1
2.5
1.5
2.3
1.5
2.3
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
Connecting any terminal to voltages greater than V
+
or less than
V
–
may cause destructive latchup. It is recommended that no sources
operating from external supplies be applied prior to power-up of the
LTC1050.
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: In =
√(2q
• Ib)
where q = 1.6 • 10
–19
Coulomb.
Note 5:
At T
A
≤
0°C these parameters are guaranteed by design and not
tested.
Note 6:
Every lot of LTC1050AM and LTC1050AC is 100% tested for
Broadband Noise at 1kHz and sample tested for Input Noise Voltage at
0.1Hz to 10Hz.
1050fb
3
LTC1050
TYPICAL PERFOR A CE CHARACTERISTICS
Offset Voltage
vs Sampling Frequency
10
V
S
=
±
5V
OFFSET VOLTAGE (µV)
6
5
4
3
2
1
COMMON MODE RANGE (V)
8
10Hz PEAK-TO-PEAK NOISE (µV)
6
4
2
0
2.0
2.5
3.5
4.0
3.0
SAMPLING FREQUENCY, f
S
(kHz)
Sampling Frequency
vs Supply Voltage
3.5
SAMPLING FREQUENCY, f
S
(kHz)
T
A
= 25°C
SAMPLING FREQUENCY, f
S
(kHz)
3.0
2.5
2.0
1.5
4
14
16
6
8
10
12
TOTAL SUPPLY VOLTAGE, V
+
TO V
–
(V)
1050 G04
Supply Current vs Supply Voltage
1.50
T
A
= 25°C
1.25
SUPPLY CURRENT, I
S
(mA)
1.8
SUPPLY CURRENT, I
S
(mA)
V
S
=
±
5V
SHORT-CIRCUIT OUTPUT CURRENT, I
OUT
(mA)
1.00
0.75
0.50
0.25
0
4
14
16
8
10
12
6
+
–
TOTAL SUPPLY VOLTAGE, V TO V (V)
1050 G07
4
U W
1050 G01
10Hz
P-P
Noise
vs Sampling Frequency
8
7
V
S
=
±
5V
8
6
4
2
0
–2
–4
–6
Common Mode Input Range
vs Supply Voltage
V
CM
= V
–
4.5
0
100
1k
SAMPLING FREQUENCY, f
S
(Hz)
10k
1050 G02
–8
0
±1
±
2
±
3
±
4
±
5
±
6
SUPPLY VOLTAGE (V)
±
7
±
8
1050 G03
Sampling Frequency
vs Temperature
5
V
S
=
±
5V
200mV
INPUT
0V
Overload Recovery
4
3
OUTPUT
0V
2
– 5V
1
A
V
= – 100
V
S
=
±5V
0.5ms/DIV
1050 G6
0
50
25
–50 –25
0
75 100
AMBIENT TEMPERATURE, T
A
(°C)
125
1050 G05
Supply Current vs Temperature
2.0
6
4
2
0
–10
–20
–30
Short-Circuit Output Current
vs Supply Voltage
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
50
25
–50 –25
0
75 100
AMBIENT TEMPERATURE, T
A
(°C)
125
I
SOURCE
V
OUT
= V
–
I
SINK
V
OUT
= V
+
4
14
16
8
10
12
6
TOTAL SUPPLY VOLTAGE, V
+
TO V
–
(V)
1050 G09
1050 G08
1050fb
LTC1050
TYPICAL PERFOR A CE CHARACTERISTICS
Gain/Phase vs Frequency
120
100
80
VOLTAGE GAIN (dB)
60
GAIN
40
20
0
– 20
V
S
=
±
5V
T
A
= 25°C
C
L
= 100pF
R
L
≥
1k
1k
10k
100k
FREQUENCY (Hz)
1M
– 40
100
LTC1050 DC to 1Hz Noise
0.5µV
10 SEC
LTC1050 DC to 10Hz Noise
1µV
1 SEC
U W
PHASE
1050 G10
Small-Signal Transient Response
60
80
100
120
140
160
180
200
220
10M
V
OUT
100mV
STEP
2V
PHASE SHIFT (DEGREES)
Large-Signal Transient Response
V
IN
= 6V
A
V
= 1
R
L
= 10k
C
L
= 100pF
V
S
=
±5V
1050 G11
A
V
= 1
R
L
= 10k
C
L
= 100pF
V
S
=
±5V
1050 G12
1050 G13
1050 G14
1050fb
5
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