LINER LTC1047CSW

LTC1047
Dual Micropower
Zero-Drift Operational Amplifier
with Internal Capacitors
DESCRIPTIO
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FEATURES
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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.
No External Components Required
Maximum Offset Voltage: 10µV
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
The LTC1047 has a typical offset voltage of 3µV, drift
of 10nV/°C, input noise voltage typically 3.5µVP-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. Overload recovery time from saturation is 70ms, four times
faster than chopper amplifiers with external capacitors.
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APPLICATIO S
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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.
Thermocouple Amplifiers
Electronic Scales
Battery Powered Instrumentation
Strain Gauge Amplifiers
Remote Located Sensors
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Micropower Single Supply Instrumentation Amplifier
CMRR vs Frequency
140
5V
120
4
1/2 LTC1043
100Ω
18
100k
5V
3
CS
1µF
CH
1µF
6
2
+IN
100
15
6
5
16
17
0.1µF
CMRR (dB)
–IN
CS = CH = 1µF
5
–
60
1/2
LTC1047
+
80
7
VOUT
40
4
GAIN = 1000
CMRR > = 120dB AT 60Hz
VOS = < 10µV
IS = 62µA (INCLUDING THE LTC1043)
20
100
LTC1047 • TA01
1k
10k
100k
FREQUENCY OF COMMON MODE SIGNAL
LT1047 • TA02
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LTC1047
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ABSOLUTE
RATI GS
(Note 1)
Total Supply Voltage (V + to V –) ............................... 16V
Input Voltage (Note 2) .......... (V + + 0.3V) to (V – – 0.3V)
Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range ................. – 65°C to 150°C
Operating Temperature Range ..................... 0°C to 70°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
NC 1
16 NC
NC 2
15 NC
OUT A 3
14 V +
OUT B
–IN A 4
13 OUT B
–IN B
+IN A 5
12 –IN B
+IN B
V–
11 +IN B
OUT A 1
8
V+
–IN A 2
7
+IN A 3
6
5
V– 4
ORDER PART
NUMBER
TOP VIEW
LTC1047CN8
N8 PACKAGE
8-LEAD PDIP
TJMAX = 110°C, θJA = 130°C/W
6
NC 7
10 NC
NC 8
9
LTC1047CSW
NC
SW PACKAGE
16-LEAD PLASTIC SO WIDE
TJMAX = 110°C, θJA = 200°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, unless otherwise noted.
PARAMETER
CONDlTlONS
Input Offset Voltage
TA = 25°C (Note 3)
Average Input Offset Voltage Drift
(Note 3)
MIN
●
TYP
MAX
UNITS
±3
±10
µV
±0.01
±0.05
µV/°C
Long Term Offset Drift
100
Input Bias Current
±5
±30
±300
pA
pA
±10
±60
±150
pA
pA
●
Input Offset Current
●
nV√mo
Input Noise Voltage
0.1Hz to 10Hz
0.1Hz to 1Hz
3.5
0.8
µVP-P
µVP-P
Input Noise Current
f = 10Hz (Note 4)
1.5
fA√Hz
Common Mode Rejection Ratio
VCM
Power Supply Rejection Ratio
= V – to 2.7V, T
A = 25°C
●
110
105
130
dB
dB
VS = ±2.375V to ±8V
●
105
122
dB
Large-Signal Voltage Gain
RL = 100k, VOUT = ±4V
●
120
150
dB
Maximum Output Voltage Swing
RL = 10k
RL = 100k
●
4.8/–4.9
4.3/–4.8
±4.95
V
V
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LTC1047
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, unless otherwise noted.
PARAMETER
CONDlTlONS
Slew Rate
RL = 100k, CL = 50pF
MIN
Gain Bandwidth Product
Supply Current/Amplifier
No Load, 25°C ≤ TA ≤ 70°C
No Load, 0°C ≤ TA ≤ 25°C
TYP
MAX
V/µs
200
kHz
60
80
Internal Sampling Frequency
150
275
680
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.
UNITS
0.2
µA
µA
Hz
Note 3: These parameters are guaranteed by design. Thermocouple effects
preclude measurements of these voltage levels in high speed automatic
test systems. VOS 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.
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TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs
Supply Voltage Per Amplifier
120
Supply Current vs
Temperature Per Amplifier
90
TA = 25°C
SUPPLY CURRENT, IS (µA)
SUPPLY CURRENT, IS (µA)
100
80
60
40
20
0
4
VS = ±5V
80
70
60
50
40
50
25
–50 –25
0
75 100
AMBIENT TEMPERATURE, TA (°C)
14
16
8
10
12
6
TOTAL SUPPLY VOLTAGE, V + TO V – (V)
LTC1047 • TPC03
LTC1047 • TPC02
Output Short-Circuit Current
vs Supply Voltage
SHORT CIRCUIT OUTPUT CURRENT, IOUT (mA)
Common Mode Input Range
vs Supply Voltage
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VCM = V –
COMMON MODE RANGE (V)
6
4
2
0
–2
–4
–6
–8
0
1
4
5
2
3
6
SUPPLY VOLTAGE (±V)
125
7
8
LTC1047 • TPC04
3
2
VOUT = V –
ISOURCE
1
0
VOUT = V +
ISINK
–4
–8
–12
4
14
16
8
10
12
6
TOTAL SUPPLY VOLTAGE, V + TO V – (V)
LTC1047 • TPC05
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LTC1047
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TYPICAL PERFOR A CE CHARACTERISTICS
CMRR vs Frequency
PSRR vs Frequency
120
160
VS = ±5V
TA = 25°C
140
100
120
PSRR (dB)
CMRR (dB)
80
100
80
60
NEGATIVE SUPPLY
60
40
40
POSITIVE SUPPLY
20
20
0
0
1
10
100
1k
FREQUENCY (Hz)
10k
1
100k
10
100
1k
FREQUENCY (Hz)
Sampling Frequency
vs Supply Voltage
Gain, Phase vs Frequency, ±5V
90
135
40
GAIN
20
180
0
225
104
105
FREQUENCY (Hz)
106
270
SAMPLING FREQUENCY, fS (Hz)
PHASE
PHASE SHIFT (DEGREES)
GAIN (dB)
900
45
80
VS = ±5V
CL = 50pF
–20
103
102
TA = 25°C
800
700
600
500
4
6
8
10
12
14
16
TOTAL SUPPLY VOLTAGE, V + TO V – (V)
LTC1047 • TPC09
LTC1047 • TPC08
Sampling Frequency
vs Temperature
SAMPLING FREQUENCY, fS (Hz)
1000
100k
LTC1047 • TPC07
LTC1047 • TPC06
60
10k
Small-Signal Transient Response
VS = ±5V
900
100mV
STEP
800
700
600
500
50
25
0
75 100
–50 –25
AMBIENT TEMPERATURE, TA (°C)
125
AV = +1
RL = 100k
CL = 50pF
VS = ±5V
10µs/DIV
LTC1047 • TPC11
LTC1047 • TPC010
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LTC1047
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TYPICAL PERFOR A CE CHARACTERISTICS
Overload Recovery
Large-Signal Transient Response
0
Photo
–5V
200mV
0
AV = +1
RL = 100k
CL = 50pF
VS = ±5V
AV = 100
VS = ±5V
10µs/DIV
10ms/DIV
LTC1047 • TPC13
LTC1047 • TPC12
TEST CIRCUITS
Electrical Characteristics Test Circuit
1M
1k
V+
2
3
–
8
1/2
LTC1047
+
4
6
OUTPUT
RL
V–
LTC1047 • TC01
DC to 10Hz Noise Test Circuit
100k
10Ω
475k
0.01µF
2
3
–
1/2
LTC1047
6
158k
316k
475k
–
LT®1012
+
0.01µF
0.01µF
OUTPUT
+
FOR 1Hz NOISE BANDWIDTH, INCREASE ALL CAPACITORS BY A FACTOR OF 10
LTC1047 • TC02
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LTC1047
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APPLICATIO S I FOR ATIO
Input Considerations
Aliasing
Frequently circuits built with parts as precise as the
LTC1047 show errors at the output far greater than the
designer expects. Rarely is the problem the op amp; more
often the surrounding circuitry is causing errors several
orders of magnitude greater than those due to the LTC1047.
Such obscure effects as leakage between pins, due to
residual solder flux and thermocouple effects between the
tin/lead solder and the copper PC board traces, can
overwhelm the pA-level bias currents and the µV-level
offset of the LTC1047. For a more complete description of
these types of problems (and some advice on avoiding
them), see the LTC1051/LTC1053 data sheet.
Like all sampled data systems, the LTC1047 will alias input
signals near its internal sampling frequency. The design
includes internal circuitry to minimize this effect; as a
result, most applications do not exhibit aliasing problems.
For a complete discussion of the correction circuitry and
aliasing behavior, refer to the LTC1051/LTC1053 data
sheet.
Input Capacitance
The LTC1047 has approximately 12pF of capacitance at
each input pin. This will react with large series resistors to
form a pole at the input, degrading the LTC1047's phase
margin. The problem is especially common with
micropower parts like the LTC1047 because high value
resistors are often used to minimize power dissipation. As
a rule of thumb, bypass feedback resistors larger than 7k
with a 20pF capacitor to minimize this effect.
Single Supply Operation
The LTC1047 is compatible with all single supply
applications. It has an input common mode range which
includes V –, and an output which will swing within
millivolts of the negative power supply. The LTC1047 is
guaranteed functional down to 4.75V total supply,
allowing it to run from minimum TTL voltage all the way up
to 16V. See the Typical Applications section for examples
of single supply operation.
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LTC1047
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TYPICAL APPLICATIO S
Low Offset, Low Drift Instrumentation Amplifier
1M
1k
1k
1M
5V
2
–IN
3
6
–
1
1/2
LTC1047
+
+IN
4
AV = 1000
VOS = ± 6µV
IS = 100µA
CMRR ≥ 120dB
–5V
5
8
–
1/2
LTC1047
7
OUTPUT
+
LTC1047 • TA02
Precise DC Full-Wave Rectifier (Absolute Value Circuit)
220k
5V
220k
INPUT
2
0V
3
IS = 50µA
VOS = 3µV
–
8
1/2
LTC1047
+
4
1N4148
1
5
6
+
1/2
LTC1047
7
OUTPUT
–
LTC1047 • TA03
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LTC1047
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TYPICAL APPLICATIO S
4mA to 20mA Transducer Amplifier
4
5
LT1120
0.1µF
1M
1000pF
2
8
1
3
7
6
1M
TO
LOOP
+
10µF
2
–
1/2
3 LTC1047
1
R2
61.9k
1%
+
INPUT
0V TO 1V
INITIAL ACCURACY = 3% (LIMITED BY REFERENCE IN LT1120)
TRIM R1 FOR 4.00mA WITH 0.00V IN
TRIM R2 FOR 20.0mA WITH 1.00V IN
R1
619K
1%
5
49.9k
1%
6
+
8
1/2
LTC1047
–
7
1k
2N2222
4
49.9Ω
1%
TO
LOOP
LTC1047 • TA04
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LTC1047
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TYPICAL APPLICATIO S
Ultralow Noise Micropower Chopper
0.47µF
5V
5V
5V
0.1µF
75k
–
1/2
LTC1047
+
100k
39k
+
1/2
LTC1047
20k
OUT
–
100k
+IN
50pF
0.1µF
–IN
–5V
100k
25K147 x 2
10Ω
150k
100k
IS = 150µA
0.1Hz TO 10Hz = 95nVP-P
AV = 10000
–5V
LTC1047 • TA06
0.47µF
0.1Hz to 10Hz Noise (Input Referred)
200nV
VS = ±5V
IS = 150µA
100nV
50nV/DIV
–100nV
–200nV
0
TIME (SEC)
10
LTC1047 • TA07
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LTC1047
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PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
.255 ± .015*
(6.477 ± 0.381)
.300 – .325
(7.620 – 8.255)
.008 – .015
(0.203 – 0.381)
+.035
.325 –.015
(
8.255
+0.889
–0.381
)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.065
(1.651)
TYP
.100
(2.54)
BSC
.120
(3.048) .020
MIN (0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
N8 1002
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
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LTC1047
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PACKAGE DESCRIPTIO
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
TYP
.398 – .413
(10.109 – 10.490)
NOTE 4
16
N
15
14
13
12
11 10
9
N
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
1
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.005
(0.127)
RAD MIN
.009 – .013
(0.229 – 0.330)
.291 – .299
(7.391 – 7.595)
NOTE 4
.010 – .029 × 45°
(0.254 – 0.737)
3
4
5
6
7
.093 – .104
(2.362 – 2.642)
8
.037 – .045
(0.940 – 1.143)
0° – 8° TYP
NOTE 3
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
2
.050
(1.270)
BSC
.004 – .012
(0.102 – 0.305)
.014 – .019
(0.356 – 0.482)
TYP
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
S16 (WIDE) 0502
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC1047
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TYPICAL APPLICATIO
Low Noise, Low Drift Composite Amplifier
5V
5
10k
6
8
+
1/2
LTC1047
7
–
0.01µF
100k
2
3
–
1/2
LTC1047
+
5V
4
750Ω
–5V
INPUT
1000pF
1
3
+
–
2
100k
56Ω
250k
1
+
7
8
LT ®1012
–
6
4
–5V
VOS = 3µV
0.1Hz TO 10Hz NOISE = 0.7µVP-P
IS = 490µA
100Ω
OUTPUT
LTC1047 • TA05
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Linear Technology Corporation
LW/TP 1202 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 1992