LTC1047
Dual Micropower
Zero-Drift Operational Amplifier
with Internal Capacitors
DESCRIPTIO
The LTC
®
1047 is a micropower, high performance
dual zero-drift operational amplifier. The sample-and-hold
capacitors usually required by other chopper amplifiers
are integrated on-chip, minimizing the need for external
components.
The LTC1047 has a typical offset voltage of 3µV, drift
of 10nV/°C, input noise voltage typically 3.5µV
P-P
,
and typical voltage gain of 150dB. The common mode
rejection is 110dB minimum, with minimum power supply
rejection of 105dB. The LTC1047 also offers a 0.2V/µs
slew rate and a gain bandwidth product of 200kHz. Over-
load recovery time from saturation is 70ms, four times
faster than chopper amplifiers with external capacitors.
The LTC1047 is available in a standard plastic 8-pin PDIP
as well as a 16-pin SW package. The LTC1047 is a plug-in
replacement for most dual op amps with improved DC
performance and substantial power savings.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
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No External Components Required
Maximum Offset Voltage: 10
µ
V
Maximum Offset Voltage Drift: 50nV/
°
C
Supply Current: 80µA
Minimum CMRR: 110dB
Minimum PSRR: 105dB
Single Supply Operation: 4.75V to 16V
Common Mode Range Includes GND
Output Swings to GND
Typical Overload Recovery Time: 70ms
Pin Compatible with Industry Standard Dual
Op Amps
APPLICATIO S
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Thermocouple Amplifiers
Electronic Scales
Battery Powered Instrumentation
Strain Gauge Amplifiers
Remote Located Sensors
TYPICAL APPLICATIO
5V
4
1/2 LTC1043
–IN
18
3
C
S
1µF
2
+IN
6
16
0.1µF
17
5
C
H
1µF
15
100Ω
Micropower Single Supply Instrumentation Amplifier
140
120
100k
5V
6
C
S
= C
H
= 1µF
100
CMRR (dB)
80
60
–
1/2
LTC1047
7
V
OUT
5
+
40
20
100
4
GAIN = 1000
CMRR > = 120dB AT 60Hz
V
OS
= < 10µV
I
S
= 62µA (INCLUDING THE LTC1043)
LTC1047 • TA01
1k
10k
100k
FREQUENCY OF COMMON MODE SIGNAL
LT1047 • TA02
U
U
U
CMRR vs Frequency
1047fa
1
LTC1047
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V
+
to V
–
) ............................... 16V
Input Voltage (Note 2) .......... (V
+
+ 0.3V) to (V
–
– 0.3V)
Output Short-Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
–
4
8
7
6
5
V
+
OUT B
–IN B
+IN B
ORDER PART
NUMBER
LTC1047CN8
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 110°C,
θ
JA
= 130°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Offset Voltage
Average Input Offset Voltage Drift
Long Term Offset Drift
Input Bias Current
CONDlTlONS
T
A
= 25°C (Note 3)
(Note 3)
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V,
unless otherwise noted.
MIN
●
Input Offset Current
●
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, T
A
= 25°C
V
S
=
±2.375V
to
±8V
R
L
= 100k, V
OUT
=
±4V
R
L
= 10k
R
L
= 100k
●
●
●
●
2
U
U
W
W W
U
W
(Note 1)
Storage Temperature Range ................. – 65°C to 150°C
Operating Temperature Range ..................... 0°C to 70°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
NC 1
NC 2
OUT A 3
–IN A 4
+IN A 5
V
–
6
NC 7
NC 8
16 NC
15 NC
14 V
+
13 OUT B
12 –IN B
11 +IN B
10 NC
9
NC
ORDER PART
NUMBER
LTC1047CSW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
T
JMAX
= 110°C,
θ
JA
= 200°C/W
TYP
±3
±0.01
100
±5
MAX
±10
±0.05
±30
±300
±60
±150
UNITS
µV
µV/°C
nV√mo
pA
pA
pA
pA
µV
P-P
µV
P-P
fA√Hz
dB
dB
dB
dB
V
V
●
±10
3.5
0.8
1.5
110
105
105
120
4.8/–4.9
130
122
150
4.3/–4.8
±4.95
1047fa
LTC1047
ELECTRICAL CHARACTERISTICS
PARAMETER
Slew Rate
Gain Bandwidth Product
Supply Current/Amplifier
Internal Sampling Frequency
CONDlTlONS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V,
unless otherwise noted.
MIN
TYP
0.2
200
No Load, 25°C
≤
T
A
≤
70°C
No Load, 0°C
≤
T
A
≤
25°C
60
80
680
150
275
MAX
UNITS
V/µs
kHz
µA
µA
Hz
R
L
= 100k, C
L
= 50pF
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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
LTC1047.
Note 3:
These parameters are guaranteed by design. Thermocouple effects
preclude measurements 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
Supply Current vs
Supply Voltage Per Amplifier
120
100
SUPPLY CURRENT, I
S
(µA)
80
60
40
20
0
T
A
= 25°C
90
SUPPLY CURRENT, I
S
(µA)
4
14
16
8
10
12
6
+
–
TOTAL SUPPLY VOLTAGE, V TO V (V)
LTC1047 • TPC02
Common Mode Input Range
vs Supply Voltage
V
CM
= V
–
6
COMMON MODE RANGE (V)
SHORT CIRCUIT OUTPUT CURRENT, I
OUT
(mA)
8
4
2
0
–2
–4
–6
–8
0
1
4
5
2
3
6
SUPPLY VOLTAGE (±V)
7
8
U W
Supply Current vs
Temperature Per Amplifier
V
S
=
±5V
80
70
60
50
40
50
25
–50 –25
0
75 100
AMBIENT TEMPERATURE, T
A
(°C)
125
LTC1047 • TPC03
Output Short-Circuit Current
vs Supply Voltage
3
2
1
0
–4
–8
–12
V
OUT
= V
+
I
SINK
V
OUT
= V
–
I
SOURCE
4
14
16
8
10
12
6
TOTAL SUPPLY VOLTAGE, V
+
TO V
–
(V)
LTC1047 • TPC05
LTC1047 • TPC04
1047fa
3
LTC1047
TYPICAL PERFOR A CE CHARACTERISTICS
CMRR vs Frequency
160
140
120
80
120
V
S
=
±5V
T
A
= 25°C
CMRR (dB)
PSRR (dB)
100
80
60
40
20
0
1
10
100
1k
FREQUENCY (Hz)
10k
100k
Gain, Phase vs Frequency,
±5V
80
45
900
60
PHASE
90
SAMPLING FREQUENCY, f
S
(Hz)
GAIN (dB)
40
GAIN
20
0
V
S
=
±5V
C
L
= 50pF
10
3
10
4
10
5
FREQUENCY (Hz)
10
6
–20
10
2
Sampling Frequency
vs Temperature
1000
SAMPLING FREQUENCY, f
S
(Hz)
V
S
=
±5V
900
100mV
STEP
800
700
600
A
V
= +1
R
L
= 100k
C
L
= 50pF
V
S
=
±5V
10µs/DIV
LTC1047 • TPC11
500
50
25
0
75 100
–50 –25
AMBIENT TEMPERATURE, T
A
(°C)
4
U W
PSRR vs Frequency
100
NEGATIVE SUPPLY
60
40
POSITIVE SUPPLY
20
0
1
10
100
1k
FREQUENCY (Hz)
10k
100k
LTC1047 • TPC06
LTC1047 • TPC07
Sampling Frequency
vs Supply Voltage
T
A
= 25°C
800
PHASE SHIFT (DEGREES)
135
700
180
600
225
270
500
4
6
8
10
12
14
16
TOTAL SUPPLY VOLTAGE, V
+
TO V
–
(V)
LTC1047 • TPC09
LTC1047 • TPC08
Small-Signal Transient Response
125
LTC1047 • TPC010
1047fa
LTC1047
TYPICAL PERFOR A CE CHARACTERISTICS
Large-Signal Transient Response
Overload Recovery
A
V
= +1
R
L
= 100k
C
L
= 50pF
V
S
=
±5V
TEST CIRCUITS
Electrical Characteristics Test Circuit
1k
1M
V
+
2
10Ω
U W
2
0
Photo
–5V
200mV
0
10µs/DIV
LTC1047 • TPC12
A
V
= 100
V
S
=
±5V
10ms/DIV
LTC1047 • TPC13
–
+
8
6
OUTPUT
R
L
3
1/2
LTC1047
4
V
–
LTC1047 • TC01
DC to 10Hz Noise Test Circuit
100k
475k
0.01µF
–
1/2
LTC1047
6
158k
316k
475k
–
LT
®
1012
OUTPUT
3
+
0.01µF
0.01µF
+
FOR 1Hz NOISE BANDWIDTH, INCREASE ALL CAPACITORS BY A FACTOR OF 10
LTC1047 • TC02
1047fa
5
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