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LTC1050 Precision Zero-Drift Operational Amplifier with Internal Capacitors DESCRIPTIO
The LTC(R)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-andhold capacitors usually required externally by other chopper amplifiers. Further, the LTC1050 offers better combined 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 0.5V, drift of 0.01V/C, DC to 10Hz, input noise voltage of 1.6VP-P and a typical voltage gain of 160dB. The slew rate of 4V/s and a gain bandwidth product of 2.5MHz are achieved with only 1mA of supply current. Overload recovery times from positive and negative saturation conditions are 1.5ms and 3ms respectively, which represents an improvement of about 100 times over chopper 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

No External Components Required Noise Tested and Guaranteed Low Aliasing Errors Maximum Offset Voltage: 5V Maximum Offset Voltage Drift: 0.05V/C Low Noise: 1.6VP-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

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 VOUT
LTC1050 2 11 DIFFERENTIAL INPUT 12 R1 13 16 0.01F 14 R2 CS 1F CH 1F 4 - 5V 1F
1050 TA01
17
- 5V
CMRR > 120dB AT DC CMRR > 120dB AT 60Hz DUAL SUPPLY OR SINGLE 5V GAIN = 1 + R2/R1 VOS = 5V 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 .................................. - 40C to 85C LTC1050H ..................................... - 40C to 125C LTC1050AM/M (OBSOLETE) .......... - 55C to 125C Total Supply Voltage (V + to V -) .............................. 18V Input Voltage ........................ (V + + 0.3V) to (V - - 0.3V) Output Short-Circuit Duration ......................... Indefinite Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC 8 NC 1 -IN 2 +IN 3 4 7 V + (CASE) 6 OUT 5 EXT CLOCK INPUT
ORDER PART NUMBER LTC1050ACH LTC1050CH LTC1050AMH LTC1050MH
NC 1 -IN 2 +IN 3 V- 4
V- H PACKAGE 8-LEAD TO-5 METAL CAN
TJMAX = 150C
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 150C/W
OBSOLETE PACKAGE
TOP VIEW NC 1 -IN 2 +IN 3 V- 4 N8 PACKAGE 8-LEAD PDIP
TJMAX = 150C, JA = 100C/W J8 PACKAGE 8-LEAD CERDIP TJMAX = 150C, JA = 100C/W
8 7 6 5
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-
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
TJMAX = 150C, JA = 70C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 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
MIN
LTC1050AM TYP MAX 0.5 0.01 50 20 10 5 0.05 60 300 30 2000 2.1
(Note 5)
0.1Hz to 10Hz (Note 6) DC to 1Hz
2
-
+
U
U
W
WW
U
W
TOP VIEW 8 7 6 5 NC V+ OUT EXT CLOCK INPUT
ORDER PART NUMBER LTC1050CS8 LTC1050HS8 S8 PART MARKING 1050 1050H ORDER PART NUMBER LTC1050CN
MIN
LTC1050AC TYP MAX 0.5 0.01 50 20 10 1.6 0.6 5 0.05 60 150 30 100 2.1
UNITS V V/C nV/Mo pA pA pA pA VP-P VP-P
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1.6 0.6
LTC1050
The denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 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) VCM = V - to 2.7V VS = 2.375V to 8V RL = 10k, VOUT = 4V RL = 10k RL = 100k RL = 10k, CL = 50pF No Load
ELECTRICAL CHARACTERISTICS
MIN 114 110 125 130 4.7
LTC1050AM TYP MAX 1.8 140 140 160 4.85 4.95 4 2.5 1 2.5
MIN 114 110 125 130 4.7
LTC1050AC TYP MAX 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/s 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 TA = 25C. VS = 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)

MIN
LTC1050M/H TYP MAX 0.5 0.01 50 20 10 5 0.05 100 300 50 2000
MIN
LTC1050C TYP MAX 0.5 0.01 50 20 10 1.6 0.6 1.8 130 5 0.05 125 200 75 150
UNITS V V/C nV/Mo pA pA pA pA VP-P VP-P fA/Hz dB dB dB dB dB dB V V V/s MHz mA mA kHz
(Note 5)
Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Slew Rate Gain Bandwidth Product Supply Current Internal Sampling Frequency
RS = 100, 0.1Hz to 10Hz (Note 6) RS = 100, DC to 1Hz f = 10Hz (Note 4) VCM = V - to 2.7V LTC1050M/C LTC1050H VS = 2.375V to 8V, LTC1050M/C LTC1050H RL = 10k, VOUT = 4V RL = 10k RL = 100k RL = 10k, CL = 50pF No Load

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. 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. Note 5: At TA 0C 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.
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LTC1050
TYPICAL PERFOR A CE CHARACTERISTICS
Offset Voltage vs Sampling Frequency
10
VS = 5V
OFFSET VOLTAGE (V)
6 5 4 3 2 1
COMMON MODE RANGE (V)
8
10Hz PEAK-TO-PEAK NOISE (V)
6
4
2
0 2.0
2.5 3.5 4.0 3.0 SAMPLING FREQUENCY, fS (kHz)
Sampling Frequency vs Supply Voltage
3.5
SAMPLING FREQUENCY, fS (kHz)
TA = 25C
SAMPLING FREQUENCY, fS (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 TA = 25C 1.25 SUPPLY CURRENT, IS (mA)
1.8
SUPPLY CURRENT, IS (mA)
VS = 5V
SHORT-CIRCUIT OUTPUT CURRENT, IOUT (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
UW
1050 G01
10HzP-P Noise vs Sampling Frequency
8 7 VS = 5V
8 6 4 2 0 -2 -4 -6
Common Mode Input Range vs Supply Voltage
VCM = V -
4.5
0 100
1k SAMPLING FREQUENCY, fS (Hz)
10k
1050 G02
-8
0
1
2 3 4 5 6 SUPPLY VOLTAGE (V)
7
8
1050 G03
Sampling Frequency vs Temperature
5 VS = 5V
200mV INPUT 0V
Overload Recovery
4
3
OUTPUT
0V
2
- 5V
1
AV = - 100 VS = 5V 0.5ms/DIV
1050 G6
0 50 25 -50 -25 0 75 100 AMBIENT TEMPERATURE, TA (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, TA (C) 125
ISOURCE VOUT = V -
ISINK VOUT = V +
4
14 16 8 10 12 6 TOTAL SUPPLY VOLTAGE, V + TO V - (V)
1050 G09
1050 G08
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LTC1050
TYPICAL PERFOR A CE CHARACTERISTICS
Gain/Phase vs Frequency
120 100 80
VOLTAGE GAIN (dB)
60 GAIN 40 20 0 - 20 VS = 5V TA = 25C CL = 100pF RL 1k 1k 10k 100k FREQUENCY (Hz) 1M
- 40 100
LTC1050 DC to 1Hz Noise
0.5V
10 SEC
LTC1050 DC to 10Hz Noise
1V
1 SEC
UW
PHASE
1050 G10
Small-Signal Transient Response
60 80 100 120 140 160 180 200 220 10M
VOUT 100mV STEP 2V
PHASE SHIFT (DEGREES)
Large-Signal Transient Response
VIN = 6V
AV = 1 RL = 10k CL = 100pF VS = 5V
1050 G11
AV = 1 RL = 10k CL = 100pF VS = 5V
1050 G12
1050 G13
1050 G14
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LTC1050
TEST CIRCUITS
Electrical Characteristics Test Circuit
1M V+ 1k 2 100k
DC-10Hz Noise Test Circuit
475k 0.015F 10
- +
7 6 RL
1050 TC01
-
OUTPUT LTC1050
158k
316k 0.015F
475k
LTC1050 3 4 V-
-
0.015F LT(R)1012 TO X-Y RECORDER
+
+
FOR 1Hz NOISE BW, INCREASE ALL THE CAPACITORS BY A FACTOR OF10
1050 TC02
APPLICATI
S I FOR ATIO
ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes In order to realize the picoampere level of accuracy of the LTC1050, proper care must be exercised. Leakage currents in circuitry external to the amplifier can significantly degrade performance. High quality insulation should be used (e.g., Teflon, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be necessary-- particularly for high temperature performance. Surface coating may be necessary to provide a moisture barrier in high humidity environments. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential close to that of the inputs: in inverting configurations the guard ring should be tied to ground; in noninverting connections to the inverting input (see Figure 1). Guarding both sides of the printed circuit board is required. Bulk leakage reduction depends on the guard ring width. Microvolts Thermocouple effect must be considered if the LTC1050's ultralow drift is to be fully utilized. Any connection of dissimilar metals forms a thermoelectric junction producing an electric potential which varies with temperature (Seebeck effect). As temperature sensors, thermocouples exploit this phenomenon to produce useful information. In low drift amplifier circuits the effect is a primary source of error. Connectors, switches, relay contacts, sockets, resistors, solder and even copper wire are all candidates for thermal
OUTPUT
V- GUARD
1050 F01
Figure 1
EMF generation. Junctions of copper wire from different manufacturers can generate thermal EMFs of 200nV/C-- 4 times the maximum drift specification of the LTC1050. The copper/kovar junction, formed when wire or printed circuit traces contact a package lead, has a thermal EMF of approximately 35V/C--700 times the maximum drift specification of the LTC1050. Minimizing thermal EMF-induced errors is possible if judicious attention is given to circuit board layout and component selection. It is good practice to minimize the number of junctions in the amplifier's input signal path. Avoid connectors, sockets, switches and relays where possible. In instances where this is not possible, attempt to balance the number and type of junctions so that differential cancellation occurs. Doing this may involve deliberately introducing junctions to offset unavoidable junctions.
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6
IN PU TS
U
V+ 7 6 OPTIONAL EXTERNAL CLOCK 5 4 3 2 8 1
W
U
UO
LTC1050
APPLICATI S I FOR ATIO U
PACKAGE-INDUCED OFFSET VOLTAGE Package-induced thermal EMF effects are another important source of errors. It arises at the copper/kovar junctions formed when wire or printed circuit traces contact a package lead. Like all the previously mentioned thermal EMF effects, it is outside the LTC1050's offset nulling loop and cannot be cancelled. The input offset voltage specification of the LTC1050 is actually set by the package-induced warm-up drift rather than by the circuit itself. The thermal time constant ranges from 0.5 to 3 minutes, depending upon package type. OPTIONAL EXTERNAL CLOCK
1050 F02
Figure 2 is an example of the introduction of an unnecessary resistor to promote differential thermal balance. Maintaining compensating junctions in close physical proximity will keep them at the same temperature and reduce thermal EMF errors.
NOMINALLY UNNECESSARY RESISTOR USED TO THERMALLY BALANCE OTHER INPUT RESISTOR
LEAD WIRE/SOLDER/COPPER TRACE JUNCTION
+
LTC1050 OUTPUT
-
RESISTOR LEAD, SOLDER COPPER TRACE JUNCTION
Figure 2
When connectors, switches, relays and/or sockets are necessary they should be selected for low thermal EMF activity. The same techniques of thermally balancing and coupling the matching junctions are effective in reducing the thermal EMF errors of these components. Resistors are another source of thermal EMF errors. Table 1 shows the thermal EMF generated for different resistors. The temperature gradient across the resistor is important, not the ambient temperature. There are two junctions formed at each end of the resistor and if these junctions are at the same temperature, their thermal EMFs will cancel each other. The thermal EMF numbers are approximate and vary with resistor value. High values give higher thermal EMF.
Table 1. Resistor Thermal EMF
RESISTOR TYPE Tin Oxide Carbon Composition Metal Film Wire Wound Evenohm Manganin THERMAL EMF/C GRADIENT ~mV/C ~450V/C ~20V/C ~2V/C ~2V/C
SAMPLING FREQUENCY, fS (kHz)
W
U
UO
An external clock is not required for the LTC1050 to operate. The internal clock circuit of the LTC1050 sets the nominal sampling frequency at around 2.5kHz. This frequency is chosen such that it is high enough to remove the amplifier 1/f noise, yet still low enough to allow internal circuits to settle.The oscillator of the internal clock circuit has a frequency 4 times the sampling frequency and its output is brought out to Pin 5 through a 2k resistor. When the LTC1050 operates without using an external clock, Pin 5 should be left floating and capacitive loading on this pin should be avoided. If the oscillator signal on Pin 5 is used to drive other external circuits, a buffer with low input capacitance is required to minimize loading on this pin. Figure 3 illustrates the internal sampling frequency versus capacitive loading at Pin 5.
3
VS = 5V
2
1 1 5 10 CAPACITANCE LOADING (pF) 100
1050 F03
Figure 3. Sampling Frequency vs Capacitance Loading at Pin 5
1050fb
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LTC1050
APPLICATI S I FOR ATIO U
PSRR is guaranteed down to 4.7V (2.35V) to ensure proper operation down to the minimum TTL specified voltage of 4.75V. PIN COMPATIBILITY The LTC1050 is pin compatible with the 8-pin versions of 7650, 7652 and other chopper-stabilized amplifiers. The 7650 and 7652 require the use of two external capacitors connected to Pin 1 and Pin 8 that are not needed for the LTC1050. Pin 1 and Pin 8 of the LTC1050 are not connected internally while Pin 5 is an optional external clock input pin. The LTC1050 can be a direct plug-in for the 7650 and 7652 even if the two capacitors are left on the circuit board. In applications operating from below 16V total power supply, (8V), the LTC1050 can replace many industry standard operational amplifiers such as the 741, LM101, LM108, OP07, etc. For devices like the 741 and LM101, the removal of any connection to Pin 5 is all that is needed.
* LT1009 350 BRIDGE 3 10k ZERO 5V
When an external clock is used, it is directly applied to Pin 5. The internal oscillator signal on Pin 5 has very low drive capability and can be overdriven by any external signal. When the LTC1050 operates on 5V power supplies, the external clock level is TTL compatible. Using an external clock can affect performance of the LTC1050. Effects of external clock frequency on input offset voltage and input noise voltage are shown in the Typical Performance Characteristics section. The sampling frequency is the external clock frequency divided by 4. Input bias currents at temperatures below 100C are dominated by the charge injection of input switches and they are basically proportional to the sampling frequency. At higher temperatures, input bias currents are mainly due to leakage currents of the input protection devices and are insensitive to the sampling frequency. LOW SUPPLY OPERATION The minimum supply for proper operation of the LTC1050 is typically below 4V (2V). In single supply applications,
TYPICAL APPLICATI
Strain Gauge Signal Conditioner with Bridge Excitation
120 5V 2.5V
5V 2
- +
7 6 2k
LTC1050 3 4 - 5V
8
W
UO
U
UO
S
+ -
7 6 R2 0.1% OUTPUT 2.5V C**
LTC1050 2 4 - 5V
301k RN60C
1N4148 2N2907 51 2W - 5V
GAIN TRIM
R1 0.1%
1050 TA03
*OPTIONAL REFERENCE OUT TO MONITORING 10-BIT A/D CONVERTER **AT GAIN = 1000, 10Hz PEAK-TO-PEAK NOISE IS < 0.5LSB FOR 10-BIT RESOLUTION
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LTC1050
TYPICAL APPLICATI UO
- +
2 0.1F
S
Air Flow Detector
10k 100k 1% 1k LT1004-1.2 43.2 1% 3 5V
Single Supply Thermocouple Amplifier
1k 1% 100 255k 1% 0.068F
2
- +
7 6 5V = NO AIR FLOW 0V = AIR FLOW
5V 5V 2 K LT1025A GND 4 R- 5 TYPE K 0C ~ 100C TEMPERATURE RANGE
1050 TA04
LTC1050 4
2
7 6 VOUT 10mV/C
AMBIENT TEMPERATURE STILL AIR
LTC1050 7 3
-
+
0.1F
4
- +
TYPE K
-
240
+
AIR FLOW
1050 TA06
Battery-Operated Temperature Monitor with 10-Bit Serial Output A/D
VIN = 9V LT1021C-5 4 1k 0.1% 3.4k 1% 0.33F 6
+
10F 178k 0.1% 1N4148
LTC1092 2 2 VIN LT1025A GND 4 R- 5 TYPE J 0C ~ 500C TEMPERATURE RANGE 2C MAX ERROR *THERMOCOUPLE LINEARIZATION CODE AVAILABLE FROM LTC J 8 3
- +
7 6 47
1 2 3 1F
CS +IN -IN GND
VCC CLK DOUT VREF
1050 TA05
8 7 6 5
TO P*
LTC1050
-
+
1F
4
4
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9
LTC1050
TYPICAL APPLICATI UO
2
S
100mA Output Drive
10k
VIN 10k 5V 2 5V 100pF 6 100k VOUT LT1010 100mA RL
1050 TA08
Fast Precision Inverter
10k 1% INPUT 5pF 10k 100pF 1000pF 5V 5V 2
3
- +
7
LTC1050 4 - 5V
- +
7 LT318A 6 OUTPUT
- +
7 6 3
- 5V
10k
LTC1050 3 4 - 5V
4 - 5V
1050 TA07
10k
FULL POWER BANDWIDTH = 10kHz VOS = 5V VOS/T = 50nV/C GAIN = 10
FULL POWER BANDWIDTH = 2MHz SLEW RATE 40V/s SETTLING TIME = 5s TO 0.01% (10V STEP) OFFSET VOLTAGE = 5V OFFSET DRIFT = 50nV/C
Ground Referred Precision Current Sources
LT1034 0 IOUT 25mA* 0.2V VOUT (V +) - 2V *MAXIMUM CURRENT LIMITED BY POWER DISSIPATION OF 2N2222 3 6 RSET 10k 2
+
VOUT
V+ 2N2222 10k 2
-
IOUT = 1.235V RSET
- +
7
+ -
7 6 RSET
LTC1050 3 4
LTC1050 4
+ -
IOUT = 1.235V RSET
2N2907 V- LT1034
VOUT
0 IOUT 25mA* (V -) + 2V VOUT -1.8V *MAXIMUM CURRENT LIMITED BY POWER DISSIPATION OF 2N2907
1050 TA09
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LTC1050
TYPICAL APPLICATI UO
2 LTC1043 NC 6 5 3
S
Precision Voltage Controlled Current Source with Ground Referred Input and Output
5V INPUT 0V TO 3.2V 3
+ -
7 6 2N2222
LTC1050 2 4 0.68F
5V 1k 4 LTC1043 8 7
11 1F 12 1F 100
14 17 0.001F
13 16 IOUT = VIN 100
1050 TA10
Sample-and-Hold Amplifier
Ultraprecision Voltage Inverter
LTC1043
-
LTC1050 6 VOUT
VIN
7
8
+
11 C1 1F 12 C2 1F 2 V+
2 SAMPLE HOLD 16 VIN 17
CL 0.01F
- +
7 6 VOUT
LTC1050
1050 TA11
13 16 0.01F
14 17
3
4 V-
FOR 1V VIN 4V, THE HOLD STEP IS 300V. ACQUISTION TIME IS DETERMINED BY THE SWITCH RON. CL TIME CONSTANT
1050 TA12
FOR VS = 5V, (V - ) + 1.8V < VIN < V + VOUT = - VIN 20ppm MATCHING BETWEEN C1 AND C2 NOT REQUIRED
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LTC1050
TYPICAL APPLICATI
Instrumentation Amplifier with Low Offset and Input Bias Current
C
Instrumentation Amplifier with 100V Common Mode Input Voltage
1k V+ 1M V+ 6 1k 2
+
VIN
-
12
UO
- +
S
2
-
LTC1050 6
1k 0.1%
100k 0.1%
3
+
2
-
LTC1050 6 OUTPUT
INPUT 3
3
+
100k 0.1%
+
LTC1050 6
1k 0.1%
2
-
1050 TA13
OFFSET VOLTAGE 10V INPUT BIAS CURRENT = 15pA CMRR = 100dB FOR GAIN = 100 INPUT REFERRED NOISE = 5VP-P FOR C = 0.1F = 20VP-P FOR C = 0.01F
1M
2
- +
7
1M
LTC1050 3 1k 4 V-
- +
7 6 VOUT
LTC1050 3 4 V-
1050 TA14
OUTPUT OFFSET 5mV FOR 0.1% RESISTORS, CMRR = 54dB
Single Supply Instrumentation Amplifier
1k V+ 1M 2 1M V+ 6 1k 2
- +
7
LTC1050 -VIN 3 4
- +
7 6 VOUT
LTC1050 +VIN 3 4
1050 TA15
OUTPUT OFFSET 5mV FOR 0.1% RESISTORS, CMRR = 54dB
1050fb
LTC1050
TYPICAL APPLICATI
10k 0.1% VIN IIN
2
3
ERROR REFERRED TO INPUT <1% FOR INPUT CURRENT RANGE 1nA ~ 1mA *TEL LAB TYPE Q81 CORRECTS FOR NONLINEARITIES
R 16k VIN C 0.47F 1 2 -8V 1N4148 0.1F 3 4 LTC1062 8 7 6 5
UO
- +
S
Photodiode Amplifier
15pF
500k 5V 2 HP 5082-4204
- +
7 6 VOUT
1050 TA16
LTC1050 3 4
500k
6 Decade Log Amplifier
MAT-01 MAT-01
0.0022F 3k 1% 15.7k 0.1% 2M 1% 1N4148 1k* 0.1%
22pF 5V
5V 7 6 VOUT
5V 7 6
- +
2
2.5M 0.1%
25k 2.5V LT1009
LTC1050 4 -5V
LTC1050 3 4 -5V
1050 TA17
VOUT = -LOG
()
V IIN = -LOG IN = -LOG(VIN) - 2V 1A 10mV
()
DC Accurate, 10Hz, 7th Order Lowpass Bessel Filter
R 196k R 196k C2 0.047F C1 0.047F 8V 3
+ -
7 6 VOUT
LTC1050 2 4 -8V
fCLK 2kHz 8V 0.1F
1050 TA18
* WIDEBAND NOISE 52VRMS * LINEAR PHASE * VIN 6V * CLOCK TO CUTOFF FREQUENCY RATIO = 200:1
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LTC1050
PACKAGE DESCRIPTIO
0.335 - 0.370 (8.509 - 9.398) DIA 0.305 - 0.335 (7.747 - 8.509) 0.040 (1.016) MAX 0.050 (1.270) MAX GAUGE PLANE 0.010 - 0.045* (0.254 - 1.143) 0.016 - 0.021** (0.406 - 0.533) *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 - 0.024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610) 0.165 - 0.185 (4.191 - 4.699) REFERENCE PLANE 0.500 - 0.750 (12.700 - 19.050)
SEATING PLANE
CORNER LEADS OPTION (4 PLCS)
0.300 BSC (0.762 BSC)
0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION
0.008 - 0.018 (0.203 - 0.457)
0 - 15 1 0.045 - 0.065 (1.143 - 1.651) 0.014 - 0.026 (0.360 - 0.660) 0.100 (2.54) BSC 0.125 3.175 MIN 2 3 4
J8 1298
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
14
U
H Package 8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
0.027 - 0.045 (0.686 - 1.143) 45TYP 0.028 - 0.034 (0.711 - 0.864) PIN 1 0.200 (5.080) TYP
H8(TO-5) 0.200 PCD 1197
0.110 - 0.160 (2.794 - 4.064) INSULATING STANDOFF
J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION 0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524) 0.005 (0.127) MIN
0.405 (10.287) MAX 8 7 6 5
0.025 (0.635) RAD TYP
0.220 - 0.310 (5.588 - 7.874)
OBSOLETE PACKAGES
1050fb
LTC1050
PACKAGE DESCRIPTIO
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381) +0.035 0.325 -0.015 +0.889 8.255 -0.381
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076)
(
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.300 - 0.325 (7.620 - 8.255)
0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
0.009 - 0.015 (0.229 - 0.381) 0.005 (0.125) MIN 0.100 (2.54) BSC *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) +0.035 0.325 -0.015 +0.889 8.255 -0.381
(
)
0.125 (3.175) MIN
0.010 - 0.020 x 45 (0.254 - 0.508)
0.008 - 0.010 (0.203 - 0.254)
0- 8 TYP
0.014 - 0.019 (0.355 - 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.016 - 0.050 (0.406 - 1.270)
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.
U
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5 0.045 - 0.065 (1.143 - 1.651) 0.130 0.005 (3.302 0.127) 0.255 0.015* (6.477 0.381) 1 2 3 4
N8 1098
0.100 (2.54) BSC
N Package 14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.770* (19.558) MAX 14 13 12 11 10 9 8
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.018 0.003 (0.457 0.076)
0.255 0.015* (6.477 0.381)
1
2
3
4
5
6
7
N14 1098
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 0.053 - 0.069 (1.346 - 1.752) 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 7 6 5
0.050 (1.270) BSC
SO8 1298
1
2
3
4
1050fb
15
LTC1050
TYPICAL APPLICATI
0.12R VIN
R C 1 2 -5V 0.1F 3 4 LTC1062 8 7 6 5
f * fCUTOFF = 0.9 CLK 100 0.2244 * RC = fCUTOFF * 60dB/OCT. SLOPE * PASSBAND ERROR <0.1dB FOR 0 f 0.67fCUTOFF * THD = 0.04%, WIDEBAND NOISE = 120VRMS * fCLK 100kHz
()
DC Accurate, Noninverting 2nd Order Lowpass Filter
R4 5V R3 2
- +
R1 VIN
R2
3
C1
C2
Q = 0.707, fC = 20Hz. FOR fC = 10Hz, THE RESISTOR (R1, R2) VALUES SHOULD BE DOUBLED COMPONENT VALUES R4 DC GAIN R3 0 1 10k 10k 2 10.5k 31.6k 4 10.2k 51.1k 6 10.2k 71.5k 8 10.1k 90.9k 10
R1 32.4k 11.8k 18.7k 14k 11.8k 10.5k
RELATED PARTS
PART NUMBER LTC1051 LTC2050 LTC2051 LTC2053 DESCRIPTION Dual Zero-Drift Op Amp's Zero-Drift Op Amp Zero-Drift Op Amp's Zero-Drift Instrumentation Amp COMMENTS Dual Version of the LTC1050 SOT-23 Package Dual Version of the LTC2050 in an MS8 Package 110dB CMRR, MS8 Package, Gain Programmable
1050fb LW/TP 0802 1K * PRINTED IN USA
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
UO
C
7 4 -5V R2 18.7k 24.3k 34.8k 46.4k 54.9k 61.9k
S
DC Accurate 10th Order Max Flat Lowpass Filter
5V 2
- +
7 6 R VOUT (DC ACCURATE) C 1 2 5V 0.1F -5V 3 4 LTC1062 8 7 6 5 5V
LTC1050 3 4 -5V
1050 TA19
fCLK
Gain of 1, 10Hz 3rd Order Bessel DC Accurate Lowpass Filter
5V 2 6 VOUT R3 5.9k R1 47.5k C3 2F R2 24.3k C1 0.47F
- +
7 6
LTC1050
LTC1050 3 C2 0.22F 4 -5V
1050 TA21 1050 TA20
C1 0.47F 0.47F 0.22F 0.22F 0.22F 0.22F
C2 0.22F 0.47F 0.47F 0.47F 0.47F 0.47F
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1991

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