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LTC1047 Dual Micropower Zero-Drift Operational Amplifier with Internal Capacitors DESCRIPTIO
The LTC(R)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 3V, drift of 10nV/C, input noise voltage typically 3.5VP-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/s 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. 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

No External Components Required Maximum Offset Voltage: 10V Maximum Offset Voltage Drift: 50nV/C Supply Current: 80A 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

Thermocouple Amplifiers Electronic Scales Battery Powered Instrumentation Strain Gauge Amplifiers Remote Located Sensors
TYPICAL APPLICATIO
5V 4 1/2 LTC1043 -IN 18 3 CS 1F 2 +IN 6 16 0.1F 17 5 CH 1F 15 100
Micropower Single Supply Instrumentation Amplifier
140 120
100k 5V 6
CS = CH = 1F
100
CMRR (dB)
80 60
-
1/2 LTC1047 7 VOUT
5
+
40 20 100
4
GAIN = 1000 CMRR > = 120dB AT 60Hz VOS = < 10V IS = 62A (INCLUDING THE LTC1043)
LTC1047 * TA01
1k 10k 100k FREQUENCY OF COMMON MODE SIGNAL
LT1047 * TA02
U
U
U
CMRR vs Frequency
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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 TJMAX = 110C, JA = 130C/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 TA = 25C (Note 3) (Note 3)
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 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) VCM = V - to 2.7V, T
A = 25C
VS = 2.375V to 8V RL = 100k, VOUT = 4V RL = 10k RL = 100k
2
U
U
W
WW
U
W
(Note 1)
Storage Temperature Range ................. - 65C to 150C Operating Temperature Range ..................... 0C to 70C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW NC 1 NC 2 OUT A 3 -IN A 4 +IN A 5 V- 6 16 NC 15 NC 14 V + 13 OUT B 12 -IN B 11 +IN B 10 NC 9 NC
ORDER PART NUMBER LTC1047CSW
NC 7 NC 8
SW PACKAGE 16-LEAD PLASTIC SO WIDE TJMAX = 110C, JA = 200C/W
TYP 3 0.01 100 5
MAX 10 0.05 30 300 60 150
UNITS V V/C nVmo pA pA pA pA VP-P VP-P fAHz 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
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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 TA = 25C. VS = 5V, unless otherwise noted.
MIN TYP 0.2 200 No Load, 25C TA 70C No Load, 0C TA 25C 60 80 680 150 275 MAX UNITS V/s kHz A A Hz RL = 100k, CL = 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. 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage Per Amplifier
120 100 SUPPLY CURRENT, IS (A) 80 60 40 20 0 TA = 25C
90
SUPPLY CURRENT, IS (A)
4
14 16 8 10 12 6 TOTAL SUPPLY VOLTAGE, V + TO V - (V)
LTC1047 * TPC02
Common Mode Input Range vs Supply Voltage
VCM = V - 6
COMMON MODE RANGE (V)
SHORT CIRCUIT OUTPUT CURRENT, IOUT (mA)
8
4 2 0 -2 -4 -6 -8 0 1 4 5 2 3 6 SUPPLY VOLTAGE (V) 7 8
UW
Supply Current vs Temperature Per Amplifier
VS = 5V
80
70
60
50
40 50 25 -50 -25 0 75 100 AMBIENT TEMPERATURE, TA (C)
125
LTC1047 * TPC03
Output Short-Circuit Current vs Supply Voltage
3 2 1 0 -4 -8 -12 VOUT = V + ISINK
VOUT = V - ISOURCE
4
14 16 8 10 12 6 TOTAL SUPPLY VOLTAGE, V + TO V - (V)
LTC1047 * TPC05
LTC1047 * TPC04
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LTC1047 TYPICAL PERFOR A CE CHARACTERISTICS
CMRR vs Frequency
160 140 120
80 120
VS = 5V TA = 25C
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, fS (Hz)
GAIN (dB)
40 GAIN 20
0 VS = 5V CL = 50pF -20 103 102
104 105 FREQUENCY (Hz)
Sampling Frequency vs Temperature
1000
SAMPLING FREQUENCY, fS (Hz)
VS = 5V
900
100mV STEP
800
700
600
AV = +1 RL = 100k CL = 50pF VS = 5V 10s/DIV
LTC1047 * TPC11
500 50 25 0 75 100 -50 -25 AMBIENT TEMPERATURE, TA (C)
4
UW
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
TA = 25C
800
PHASE SHIFT (DEGREES)
135
700
180
600
225
106
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
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LTC1047 TYPICAL PERFOR A CE CHARACTERISTICS
Large-Signal Transient Response Overload Recovery
AV = +1 RL = 100k CL = 50pF VS = 5V
TEST CIRCUITS
Electrical Characteristics Test Circuit
1k 1M V+ 2
10
UW
2
0
Photo
-5V 200mV 0 10s/DIV
LTC1047 * TPC12
AV = 100 VS = 5V
10ms/DIV
LTC1047 * TPC13
- +
8 6 OUTPUT RL
3
1/2 LTC1047 4 V-
LTC1047 * TC01
DC to 10Hz Noise Test Circuit
100k 475k 0.01F
-
1/2 LTC1047 6
158k
316k
475k
-
LT(R)1012 OUTPUT
3
+
0.01F 0.01F
+
FOR 1Hz NOISE BANDWIDTH, INCREASE ALL CAPACITORS BY A FACTOR OF 10
LTC1047 * TC02
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LTC1047
APPLICATIO S I FOR ATIO
Input Considerations
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 V-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. 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.
6
U
Aliasing 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. 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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W
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LTC1047
TYPICAL APPLICATIO S
Low Offset, Low Drift Instrumentation Amplifier
1M 1k 1k 1M 5V 2
INPUT 0V
IS = 50A VOS = 3V
U
-
1/2 LTC1047 1 AV = 1000 VOS = 6V IS = 100A CMRR 120dB +IN
6
- +
8 7 OUTPUT
-IN
3
+
5
1/2 LTC1047
4 -5V
LTC1047 * TA02
Precise DC Full-Wave Rectifier (Absolute Value Circuit)
220k 5V 220k 2
- +
8 1
1N4148
3
1/2 LTC1047 4
5
+
1/2 LTC1047 7 OUTPUT
6
-
LTC1047 * TA03
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LTC1047
TYPICAL APPLICATIO S
4mA to 20mA Transducer Amplifier
0.1F 8 1
2
- +
1/2 3 LTC1047 INPUT 0V TO 1V
1
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
8
U
5 LT1120
4 1M 2 3 7 6 1M TO LOOP 10F 1000pF
+
R2 61.9k 1%
R1 619K 1% 5
+ -
8 7 1k 2N2222
49.9k 1%
6
1/2 LTC1047 4
49.9 1%
TO LOOP
LTC1047 * TA04
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LTC1047
TYPICAL APPLICATIO S
Ultralow Noise Micropower Chopper
0.47F 5V 5V 5V 0.1F 75k 100k
-
1/2 LTC1047
+
100k
+IN
200nV
VS = 5V IS = 150A
100nV
50nV/DIV
-100nV
-200nV 0 TIME (SEC) 10
LTC1047 * TA07
U
39k
+
20k 1/2 LTC1047 OUT
-
0.1F -5V 100k 50pF
-IN 25K147 x 2
10 150k -5V 0.47F 100k IS = 150A 0.1Hz TO 10Hz = 95nVP-P AV = 10000
LTC1047 * TA06
0.1Hz to 10Hz Noise (Input Referred)
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LTC1047
PACKAGE DESCRIPTIO
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381) +.035 .325 -.015
(
8.255
+0.889 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
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N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5 .255 .015* (6.477 0.381) 1 2 3 4 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
.100 (2.54) BSC
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LTC1047
PACKAGE DESCRIPTIO U
SW Package 16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.030 .005 TYP N .050 BSC .045 .005 .398 - .413 (10.109 - 10.490) NOTE 4 16 15 14 13 12 11 10 9 N .420 MIN .325 .005 NOTE 3 .394 - .419 (10.007 - 10.643) N/2 N/2 1 .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737)
0 - 8 TYP
1
2
3
RECOMMENDED SOLDER PAD LAYOUT 2 3 4 5 6 7 8
.093 - .104 (2.362 - 2.642)
.037 - .045 (0.940 - 1.143)
.005 (0.127) RAD MIN
.009 - .013 (0.229 - 0.330)
NOTE 3 .016 - .050 (0.406 - 1.270)
.050 (1.270) BSC
.004 - .012 (0.102 - 0.305)
NOTE: 1. DIMENSIONS IN
.014 - .019 (0.356 - 0.482) TYP
S16 (WIDE) 0502
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)
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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.
11
LTC1047
TYPICAL APPLICATIO U
Low Noise, Low Drift Composite Amplifier
5V 5 10k
+ -
8 7 0.01F 1000pF
6
1/2 LTC1047 100k
2
-
1/2 LTC1047
1 5V 750 3 1 56
3
+
4 -5V
250k 7 8 6 OUTPUT
INPUT
+ -
+ -
2
LT (R)1012 4 -5V
100k
100
VOS = 3V 0.1Hz TO 10Hz NOISE = 0.7VP-P IS = 490A
LTC1047 * TA05
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LW/TP 1202 1K REV A * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1992

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