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LTC2053 Precision, Rail-to-Rail Input and Output, Zero-Drift Instrumentation Amplifier with Resistor-Programmable Gain
FEATURES
s s s s s s s s s s
DESCRIPTIO
116dB CMRR Independent of Gain Maximum Offset Voltage: 10V Maximum Offset Voltage Drift: 50nV/C Rail-to-Rail Input Rail-to-Rail Output 2-Resistor Programmable Gain Supply Operation: 2.7V to 5.5V Typical Noise: 2.5VP-P (0.01Hz to 10Hz) Typical Supply Current: 750A MS8 Package
The LTC(R)2053 is a high precision instrumentation amplifier. The CMRR is typically 116dB with a single or dual 5V supply with any programmed gain including unity. The offset is guaranteed below 10V with a temperature drift of less than 50nV/C. The LTC2053 is easy to use; the gain is adjustable with two external resistors, like a traditional op amp. The LTC2053 uses charge balanced sampled data techniques to convert a differential input voltage into a single ended signal that is in turn amplified by a zero-drift operational amplifier. The differential inputs operate from rail-to-rail and the single ended output swings from rail-to-rail. The LTC2053 can be used in single supply applications, as low as 2.7V. It can also be used with dual 5.5V supplies. The LTC2053 is available in an MS8 surface mount package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s
Thermocouple Amplifiers Electronic Scales Medical Instrumentation Strain Gauge Amplifiers High Resolution Data Acquisition
TYPICAL APPLICATIO
3V
Differential Bridge Amplifier
0.1F R < 10k 2 8 INPUT OFFSET VOLTAGE (V)
Typical Input Referred Offset vs Input Common Mode Voltage (VS = 3V)
15 10 5 0 -5 G = 10 -10 G=1 -15
2053 TA01
VS = 3V VREF = 0V TA = 25C
-
LTC2053 7 6 5 1, 4 GAIN = 1+ 0.1F R1 10 R2 10k R2 R1 OUT
3
+
0
1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V)
U
G = 1000 G = 100 3.0
2053 G01
U
U
2053f
1
LTC2053
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW EN -IN +IN V- 1 2 3 4 8 7 6 5 V+ OUT RG REF
Total Supply Voltage (V + to V -) ............................... 11V Input Current ...................................................... 10mA VIN+ - VREF ........................................................ 5.5V VIN- - VREF ........................................................ 5.5V Output Short Circuit Duration .......................... Indefinite Operating Temperature Range LTC2053C ............................................... 0C to 70C LTC2053I ............................................ - 40C to 85C LTC2053H ........................................ - 40C to 125C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC2053CMS8 LTC2053IMS8 LTC2053HMS8 MS8 PART MARKING LTVT LTJY LTAFB
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 200C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V + = 3V, V - = 0V, REF = 200mV. Output voltage swing is referenced to V -. All other specifications reference the OUT pin to the REF pin.
PARAMETER Gain Error Gain Nonlinearity Input Offset Voltage (Note 2) Average Input Offset Drift (Note 2) Average Input Bias Current (Note 3) Average Input Offset Current (Note 3) Input Noise Voltage Common Mode Rejection Ratio (Notes 4, 5) CONDITIONS AV = 1 AV = 1 VCM = 200mV TA = - 40C to 85C TA = 85C to 125C VCM = 1.2V VCM = 1.2V DC to 10Hz AV = 1, VCM = 0V to 3V, LTC2053C AV = 1, VCM = 0.1V to 2.9V, LTC2053I AV = 1, VCM = 0V to 3V, LTC2053I AV = 1, VCM = 0.1V to 2.9V, LTC2053H AV = 1, VCM = 0V to 3V, LTC2053H VS = 2.7V to 6V RL = 2k to V - RL = 10k to V - VEN 0.5V, No Load VEN 2.5V 2.5 VEN = V- - 0.5 200 0.2 3 -10
q q q q q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN
TYP 0.001 3 -5 -1 4 1 2.5
MAX 0.01 12 10 50 -2.5 10 3
UNITS % ppm V nV/C V/C nA nA VP-P dB dB dB dB dB dB V V
105 105 95 100 90 110 2.85 2.95
113 113 113
Power Supply Rejection Ratio (Note 6) Output Voltage Swing High Output Voltage Swing Low Supply Current Supply Current, Shutdown EN Pin Input Low Voltage, VIL EN Pin Input High Voltage, VIH EN Pin Input Current Internal Op Amp Gain Bandwidth Slew Rate Internal Sampling Frequency
116 2.94 2.98 20 0.75 1 10 0.5
2
U
mV mA A V V A kHz V/s kHz
2053f
W
U
U
WW
W
LTC2053
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V + = 5V, V - = 0V, REF = 200mV. Output voltage swing is referenced to V -. All other specifications reference the OUT pin to the REF pin.
PARAMETER Gain Error Gain Nonlinearity Input Offset Voltage (Note 2) Average Input Offset Drift (Note 2) Average Input Bias Current (Note 3) Average Input Offset Current (Note 3) Common Mode Rejection Ratio (Notes 4, 5) CONDITIONS AV = 1 AV = 1 VCM = 200mV TA = - 40C to 85C TA = 85C to 125C VCM = 1.2V VCM = 1.2V AV = 1, VCM = 0V to 5V, LTC2053C AV = 1, VCM = 0.1V to 4.9V, LTC2053I AV = 1, VCM = 0V to 5V, LTC2053I AV = 1, VCM = 0.1V to 4.9V, LTC2053H AV = 1, VCM = 0V to 5V, LTC2053H VS = 2.7V to 6V RL = 2k to V - RL = 10k to V - VEN 0.5V, No Load VEN 4.5V 4.5 VEN = V- -1 200 0.2 3 -10
q q q q q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN
TYP 0.001 3 -5 -1 4 1
MAX 0.01 10 10 50 -2.5 10 3
UNITS % ppm V nV/C V/C nA nA dB dB dB dB dB dB V V
105 105 95 100 90 110 4.85 4.95
116 116 116
Power Supply Rejection Ratio (Note 6) Output Voltage Swing High Output Voltage Swing Low Supply Current Supply Current, Shutdown EN Pin Input Low Voltage, VIL EN Pin Input High Voltage, VIH EN Pin Input Current Internal Op Amp Gain Bandwidth Slew Rate Internal Sampling Frequency
116 4.94 4.98 20 0.85 1.1 10 0.5
mV mA A V V A kHz V/s kHz
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V + = 5V, V - = - 5V, REF = 0V.
PARAMETER Gain Error Gain Nonlinearity Input Offset Voltage (Note 2) Average Input Offset Drift (Note 2) Average Input Bias Current (Note 3) Average Input Offset Current (Note 3) Common Mode Rejection Ratio (Notes 4, 5) CONDITIONS AV = 1 AV = 1 VCM = 0V TA = - 40C to 85C TA = 85C to 125C VCM = 1V VCM = 1V AV = 1, VCM = - 5V to 5V, LTC2053C AV = 1, VCM = - 4.9V to 4.9V, LTC2053I AV = 1, VCM = - 5V to 5V, LTC2053I AV = 1, VCM = -4.9V to 4.9V, LTC2053H AV = 1, VCM = -5V to 5V, LTC2053H VS = 2.7V to 11V RL = 2k to GND, LTC2053C, LTC2053I RL = 10k to GND, LTC2053C, LTC2053I, LTC2053H RL = 2k to GND, LTC2053H
q q q q q q q q q q q q q q q
MIN
TYP 0.001 3 10 -1 4 1
MAX 0.01 10 20 50 -2.5 10 3
UNITS % ppm V nV/C V/C nA nA dB dB dB dB dB dB V V V
2053f
105 105 95 100 90 110 4.5 4.6 4.4
118 118 118
Power Supply Rejection Ratio (Note 6) Maximum Output Voltage Swing
116 4.8 4.9 4.8
3
LTC2053
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V + = 5V, V - = - 5V, REF = 0V.
PARAMETER Supply Current Supply Current, Shutdown EN Pin Input Low Voltage, VIL EN Pin Input High Voltage, VIH EN Pin Input Current Internal Op Amp Gain Bandwidth Slew Rate Internal Sampling Frequency Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: 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 3: If the total source resistance is less than 10k, no DC errors result from the input bias currents or the mismatch of the input bias currents or the mismatch of the resistances connected to -IN and +IN. VEN = V - 4.5 -3 200 0.2 3 - 20 CONDITIONS VEN - 4.5V, No Load VEN 4.5V
q
ELECTRICAL CHARACTERISTICS
MIN
TYP 0.95
MAX 1.3 20 - 4.5
UNITS mA A V V A kHz V/s kHz
Note 4: The CMRR with a voltage gain, AV, larger than 10 is 120dB (typ). Note 5: At temperatures above 70C, the common mode rejection ratio lowers when the common mode input voltage is within 100mV of the supply rails. Note 6: The power supply rejection ratio (PSRR) measurement accuracy depends on the proximity of the power supply bypass capacitor to the device under test. Because of this, the PSRR is 100% tested to relaxed limits at final test. However, their values are guaranteed by design to meet the data sheet limits.
2053f
4
LTC2053 TYPICAL PERFOR A CE CHARACTERISTICS
Input Offset Voltage vs Input Common Mode Voltage
15 10 5 0 -5 G = 10 -10 G=1 -15
-15
INPUT OFFSET VOLTAGE (V)
INPUT OFFSET VOLTAGE (V)
INPUT OFFSET VOLTAGE (V)
VS = 3V VREF = 0V TA = 25C
G = 1000 G = 100
0
1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V)
Input Offset Voltage vs Input Common Mode Voltage
20 VS = 3V 15 VREF = 0V G = 10 10 5 0 -5 -10 -15 -20 0 TA = 25C TA = 70C TA = -55C 1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V) 3.0 TA = 85C
20
INPUT OFFSET VOLTAGE (V)
INPUT OFFSET VOLTAGE (V)
INPUT OFFSET VOLTAGE (V)
Input Offset Voltage vs Input Common Mode Voltage
60 40 20 0 TA = 25C -20 -40 -60 TA = 125C H-GRADE PARTS VS = 3V VREF = 0V G = 10 60 40 20 0
INPUT OFFSET VOLTAGE (V)
INPUT OFFSET VOLTAGE (V)
INPUT OFFSET VOLTAGE (V)
TA = 85C
0
1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V)
UW
2053 G01
2053 G04
Input Offset Voltage vs Input Common Mode Voltage
15 VS = 5V VREF = 0V 10 TA = 25C 5 0 -5 -10 G = 10 G = 100 G=1 G = 1000
20
Input Offset Voltage vs Input Common Mode Voltage
VS = 5V 15 VREF = 0V TA = 25C 10 5 0 -5 -10 -15 G=1 G=100 G=10 G=1000
3.0
0
2 3 4 1 INPUT COMMON MODE VOLTAGE (V)
5
-20
-5
-1 1 3 -3 INPUT COMMON MODE VOLTAGE (V)
5
2053 G02
2053 G03
Input Offset Voltage vs Input Common Mode Voltage
VS = 5V 15 VREF = 0V G = 10 10 5 0 -5 -10 -15 -20 0 TA = 25C TA = 85C TA = 70C
20
Input Offset Voltage vs Input Common Mode Voltage
VS = 5V 15 VREF = 0V G = 10 10 5 0 -5 -10 -15 -20 TA = -55C TA = 70C TA = 25C TA = 85C
TA = -55C 2 3 4 1 INPUT COMMON MODE VOLTAGE (V) 5
-5
-1 1 3 -3 INPUT COMMON MODE VOLTAGE (V)
5
2053 G05
2053 G06
Input Offset Voltage vs Input Common Mode Voltage
H-GRADE PARTS VS = 5V VREF = 0V G = 10
100
Input Offset Voltage vs Input Common Mode Voltage
H-GRADE PARTS 80 VS = 5V 60 VREF = 0V G = 10 40 20 0 -20 -40 -60 -80 -100 TA = 125C -5 -1 1 3 -3 INPUT COMMON MODE VOLTAGE (V) 5 TA = 25C TA = 85C
TA = 85C -20 -40 -60 TA = 25C
TA = 125C 0 2 3 4 1 INPUT COMMON MODE VOLTAGE (V) 5
3.0
2053 G07
2053 G08
2053 G09
2053f
5
LTC2053 TYPICAL PERFOR A CE CHARACTERISTICS
Error Due to Input RS vs Input Common Mode (CIN < 100pF)
60
ADDITIONAL OFFSET ERROR (V)
ADDITIONAL OFFSET ERROR (V)
40 20 0
20 10 0 -10 -20 -30
ADDITIONAL OFFSET ERROR (V)
VS = 3V VREF = 0V R+ = R- = RS CIN < 100pF G = 10 TA = 25C
RS = 5k RS = 0k RS = 10k
-20 -40 -60
RS SMALL CIN RS 0 + -
RS = 15k RS = 20k
1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V)
Error Due to Input RS Mismatch vs Input Common Mode (CIN < 100pF)
50 40
ADDITIONAL OFFSET ERROR (V)
30 20 10 0 -10 -20 -30 -40 -50 0
ADDITIONAL OFFSET ERROR (V)
RIN+ = 0k, RIN- = 15k
R+ = 0k, R- = 10k
ADDITIONAL OFFSET ERROR (V)
VS = 3V VREF = 0V CIN < 100pF G = 10 TA = 25C
R+ = 0k, R- = 15k
R+ = 0k, R- = 5k
R
R+ = 5k, R- = 0k + - + R = 10k, R = 0k + - R+ =15k, R- = 0k 3.0
SMALL CIN R-
2.5 1.0 1.5 2.0 0.5 INPUT COMMON MODE VOLTAGE (V)
Error Due to Input RS vs Input Common Mode (CIN > 1F)
40
ADDITIONAL OFFSET ERROR (V)
ADDITIONAL OFFSET ERROR (V)
RS = 5k RS = 1k RS = 500
ADDITIONAL OFFSET ERROR (V)
VS = 3V 30 VREF =-0V R+ = R = RS C > 1F 20 IN G = 10 T = 25C 10 A 0 -10 -20 -30 -40 0 RS BIG CIN RS + -
RS = 15k
RS = 10k RS = 5k
1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V)
6
UW
2053 G10
2053 G13
Error Due to Input RS vs Input Common Mode (CIN < 100pF)
30 VS = 5V VREF = 0V R+ = R- = RS CIN < 100pF G = 10 TA = 25C 25 RS = 20k 20 15 10 5 0 -5 -10 -15 -20 -25 0 2 3 4 1 INPUT COMMON MODE VOLTAGE (V) 5
Error Due to Input RS vs Input Common Mode (CIN < 100pF)
VS = 5V VREF = 0V R+ = R- = RS CIN < 100pF G = 10 TA = 25C RS = 20k RS = 15k
RS = 15k RS = 10k RS = 5k
RS = 10k
3.0
-5
-1 1 3 -3 INPUT COMMON MODE VOLTAGE (V)
5
2053 G11
2053 G12
Error Due to Input RS Mismatch vs Input Common Mode (CIN < 100pF)
40 VS = 5V 30 VREF = 0V CIN < 100pF 20 G = 10 TA = 25C 10 0 -10 -20 -30 -40 0 RIN+ =20k, RIN- = 0k 2 3 4 1 INPUT COMMON MODE VOLTAGE (V) 5 RIN+ =10k, RIN- = 0k RIN+ =15k, RIN- = 0k RIN+ = 0k, RIN- = 20k 40
Error Due to Input RS Mismatch vs Input Common Mode (CIN < 100pF)
VS = 5V 30 VREF = 0V CIN < 100pF 20 G = 10 TA = 25C 10 0 -10 -20 R+ =20k, R- = 0k -30 -40 -5 -1 1 3 -3 INPUT COMMON MODE VOLTAGE (V) 5 R+ =15k, R- = 0k R+ = 0k, R- = 20k
RIN+ = 0k, RIN- = 10k
R+ = 0k, R- = 15k
2053 G14
2053 G15
Error Due to Input RS vs Input Common Mode (CIN > 1F)
70 VS = 5V VREF = 0V 50 R+ = R- = RS CIN > 1F 30 G = 10 TA = 25C 10 -10 -30 -50 -70
Error Due to Input RS vs Input Common Mode (CIN > 1F)
80 VS = 5V 60 VREF =-0V R+ = R = RS 40 CIN > 1F G = 10 20 TA = 25C 0 -20 -40 -60 -80 -5 -1 1 3 -3 INPUT COMMON MODE VOLTAGE (V) 5 RS = 10k RS = 5k RS = 1k RS = 500
RS = 10k
3.0
0
2 3 4 1 INPUT COMMON MODE VOLTAGE (V)
5
2053 G16
2053 G17
2053 G18
2053f
LTC2053 TYPICAL PERFOR A CE CHARACTERISTICS
Error Due to Input RS Mismatch vs Input Commom Mode (CIN >1F)
200 ADDITIONAL OFFSET ERROR (V) ADDITIONAL OFFSET ERROR (V) VS = 3V 150 VREF = 0V TA = 25C 100 50 0 -50 R+ BIG CIN R- -200 0 1.0 1.5 2.0 2.5 0.5 INPUT COMMON MODE VOLTAGE (V) 3.0 R+ = 100, R- = 0k R+ = 500, R- = 0k + - R+ =1k, R- = 0k
R+ = 0k, R- = 1k R+ = 0k, R- = 500 R+ = 0k, R- = 100
ADDITIONAL OFFSET ERROR (V)
-100 -150
Offset Voltage vs Temperature
80 60
INPUT OFFSET VOLTAGE (V)
40 20 0 VS = 3V -20 -40 -60 -80 -50 -25 0 25 50 75 100 125 VOS (V) VOS (V) VS = 5V VS = 5V
TEMPERATURE (C)
2053 G22
Gain Nonlinearity, G = 1
10 8 6
NONLINEARITY (ppm)
4 2 0 -2 -4 -6 -8
NONLINEARITY (ppm)
VS = 2.5V VREF = 0V G=1 RL = 10k TA = 25C
CMRR (db)
-10 -2.4 -1.9 -1.4 -0.9 -0.4 0.1 0.6 OUTPUT VOLTAGE (V)
UW
2053 G19
Error Due to Input RS Mismatch vs Input Commom Mode (CIN >1F)
200 150 100 50 0 50 R+ = 100, R- = 0k R+ = 500, R- = 0k R+ =1k, R- = 0k VS = 5V VREF = 0V TA = 25C R+ = 0k, R- = 1k R+ = 0k, R- = 500 R+ = 0k, R- = 100
150
Error Due to Input RS Mismatch vs Input Commom Mode (CIN >1F)
VS = 5V VREF = 0V 100 TA = 25C 50 0 -50 R+ = 100, R- = 0k R+ = 500, R- = 0k R+ =1k, R- = 0k R+ = 0k, R- = 1k R+ = 0k, R- = 500 R+ = 0k, R- = 100
-100 -150 -200 0
-100 -150
2 3 4 1 INPUT COMMON MODE VOLTAGE (V)
5
-5
-1 1 3 -3 INPUT COMMON MODE VOLTAGE (V)
5
2053 G20
2053 G21
VOS vs REF (Pin 5)
30 20 10 0 -10 -20 -30 VS = 3V VS = 5V VIN+ = VIN- = REF G = 10 TA = 25C 60 40 20 0
VOS vs REF (Pin 5)
VIN+ = VIN- = REF G = 10 TA = 25C
VS = 10V -20 -40 -60
0
1
2 VREF (V)
3
4
2053 G23
0
1
2
3
5 4 VREF (V)
6
7
8
9
2053 G24
Gain Nonlinearity, G = 10
10 VS = 2.5V 8 VREF = 0V G = 10 6 RL = 10k 4 TA = 25C 2 0 -2 -4 -6 -8
CMRR vs Frequency
130 120 110 100 R+ = 10k, R- = 0k 90 80 R- 70 R+ + - 1 R+ = 0k, R- = 10k 10 100 FREQUENCY (Hz) 1000
2053 G27
VS = 3V, 5V, 5V VIN = 1VP-P R+ = R- = 1k
R+ = R- = 10k
1.1
1.6
-10 -2.4
-1.4
-0.4 0.6 1.6 OUTPUT VOLTAGE (V)
2.6
2053 G26
2053 G25
2053f
7
LTC2053 TYPICAL PERFOR A CE CHARACTERISTICS
Input Voltage Noise Density vs Frequency
300 INPUT REFERRED NOISE DENSITY (nV/Hz) 250 200 150 100 50 0
INPUT REFFERED NOISE VOLTAGE (V)
VS = 5V VS = 5V VS = 3V
2 1 0 -1 -2 -3
INPUT REFFERED NOISE VOLTAGE (V)
G = 10 TA = 25C
1
10
100 1000 FREQUENCY (Hz)
Output Voltage Swing vs Output Current
5.0 4.5
OUTPUT VOLTAGE SWING (V)
TA = 25C
VS = 5V, SOURCING
OUTPUT VOLTAGE SWING (V)
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0.01 VS = 3V, SINKING VS = 5V, SINKING VS = 3V, SOURCING
SUPPLY CURRENT
1 0.1 OUTPUT CURRENT (mA)
Low Gain Settling Time vs Settling Accuracy
8 7
SETTLING TIME (ms)
SETTLING TIME (ms)
6 5 4 3 2 1 0 0.0001
25 20 15 10 5 0
CLOCK FREQUENCY (kHz)
VS = 5V dVOUT = 1V G < 100 TA = 25C
0.01 0.001 SETTLING ACCURACY (%)
8
UW
2053 G27 2053 G31
2053 G34
Input Referred Noise in 10Hz Bandwidth
3 VS = 3V TA = 25C
Input Referred Noise in 10Hz Bandwidth
3 2 1 0 -1 -2 -3 VS = 5V TA = 25C
10000
0
2
4
6 TIME (s)
8
10
2053 G29
0
2
4
6 TIME (s)
8
10
2053 G30
Output Voltage Swing vs Output Current
5 4 3 2 1 0 -1 -2 -3 -4 0.65 SINKING 1 0.1 OUTPUT CURRENT (mA) 10
2053 G32
Supply Current vs Supply Voltage
1.00 0.95 TA = 125C 0.90 0.85 0.80 0.75 0.70 TA = -55C TA = 85C TA = 0C
VS = 5V TA = 25C
SOURCING
10
-5 0.01
0.60 2.5
4.5
6.5 8.5 SUPPLY VOLTAGE (V)
10.5
2053 G33
Settling Time vs Gain
35 30 VS = 5V dVOUT = 1V 0.1% ACCURACY TA = 25C
3.40 3.35 3.30
Internal Clock Frequency vs Supply Voltage
TA = 125C 3.25 TA = 85C 3.20 3.15 TA = 25C TA = -55C 6.5 8.5 SUPPLY VOLTAGE (V) 10.5
2053 G36
0.1
1
10
100 GAIN (V/V)
1000
10000
2053 G35
3.10 2.5
4.5
2053f
LTC2053
PI FU CTIO S
EN (Pin 1): Active Low Enable Pin. -IN (Pin 2): Inverting Input. +IN (Pin 3): Noninverting Input. V - (Pin 4): Negative Supply. REF (Pin 5): Voltage Reference (VREF) for Amplifier Output. RG (Pin 6): Inverting Input of Internal Op Amp. With a resistor, R2, connected between the OUT pin and the RG pin and a resistor, R1, between the RG pin and the REF pin, the DC gain is given by 1 + R2 / R1. OUT (Pin 7): Amplifier Output. VOUT = GAIN (V+IN - V-IN) + VREF V + (Pin 8): Positive Supply.
BLOCK DIAGRA
APPLICATIO S I FOR ATIO
Theory of Operation
The LTC2053 uses an internal capacitor (CS) to sample a differential input signal riding on a DC common mode voltage (see Block Diagram). This capacitor's charge is transferred to a second internal hold capacitor (CH) translating the common mode of the input differential signal to that of the REF pin. The resulting signal is amplified by a zero-drift op amp in the noninverting configuration. The RG pin is the negative input of this op amp and allows external programmability of the DC gain. Simple filtering can be realized by using an external capacitor across the feedback resistor. Input Voltage Range The input common mode voltage range of the LTC2053 is rail-to-rail. However, the following equation limits the size of the differential input voltage: V - (V+IN - V-IN) + VREF V + - 1.3
U
W
W
U
U
U
U
U
8 V+ +IN 3 -IN 2 CS CH ZERO-DRIFT OP AMP OUT 7
+ -
REF 5 6 RG 4
V- 1
EN
2053 BD
Where V+IN and V-IN are the voltages of the +IN and -IN pins respectively, VREF is the voltage at the REF pin and V+ is the positive supply voltage. For example, with a 3V single supply and a 0V to 100mV differential input voltage, VREF must be between 0V and 1.6V. 5 Volt Operation When using the LTC2053 with supplies over 5.5V, care must be taken to limit the maximum difference between any of the input pins (+IN or -IN) and the REF pin to 5.5V; if not, the device will be damaged. For example, if rail-torail input operation is desired when the supplies are at 5V, the REF pin should be 0V, 0.5V. As a second example, if V + is 10V and V - and REF are at 0V, the inputs should not exceed 5.5V.
2053f
9
LTC2053
APPLICATIO S I FOR ATIO
Settling Time The sampling rate is 3kHz and the input sampling period during which CS is charged to the input differential voltage VIN is approximately 150s. First assume that on each input sampling period, CS is charged fully to VIN. Since CS = CH (= 1000pF), a change in the input will settle to N bits of accuracy at the op amp noninverting input after N clock cycles or 333s(N). The settling time at the OUT pin is also affected by the settling of the internal op amp. Since the gain bandwidth of the internal op amp is typically 200kHz, the settling time is dominated by the switched capacitor front end for gains below 100 (see Typical Performance Characteristics). Input Current Whenever the differential input VIN changes, CH must be charged up to the new input voltage via CS. This results in an input charging current during each input sampling period. Eventually, CH and CS will reach VIN and, ideally, the input current would go to zero for DC inputs. In reality, there are additional parasitic capacitors which disturb the charge on CS every cycle even if VIN is a DC voltage. For example, the parasitic bottom plate capacitor on CS must be charged from the voltage on the REF pin to the voltage on the -IN pin every cycle. The resulting input charging current decays exponentially during each input sampling period with a time constant equal to RSCS. If the voltage disturbance due to these currents settles before the end of the sampling period, there will be no errors due to source resistance or the source resistance mismatch between -IN and +IN. With RS less than 10k, no DC errors occur due to this input current. In the Typical Performance Characteristics section of this data sheet, there are curves showing the additional error from non-zero source resistance in the inputs. If there are no large capacitors across the inputs, the amplifier is less sensitive to source resistance and source resistance mismatch. When large capacitors are placed across the inputs, the input charging currents described above result in larger DC errors, especially with source resistor mismatches. Power Supply Bypassing The LTC2053 uses a sampled data technique and therefore contains some clocked digital circuitry. It is therefore sensistive to supply bypassing. For single or dual supply operation, a 0.1F ceramic capacitor must be connected between Pin 8 (V +) and Pin 4 (V -) with leads as short as possible.
SINGLE SUPPLY, UNITY GAIN 5V 8 V+IN 3
+
VD
+
7
V-IN
-
2
-
4
5
0V < V+IN < 5V 0V < V-IN < 5V 0V < VD < 3.7V VOUT = VD
10
U
DUAL SUPPLY 5V 8 V+IN 6 VOUT V-IN 3
W
U
U
+
VD
+
7
-
2
-
4 -5V
5
6 R2 R1
VOUT
VREF -5V < V-IN < 5V AND V-IN - VREF < 5.5V -5V < V+IN < 5V AND V+IN - VREF < 5.5V -5V < VD + VREF < 3.7V VOUT = 1 +
(
R2 R1
)
VD + VREF
2053 F01
Figure 1
2053f
LTC2053
TYPICAL APPLICATIO S
Differential Thermocouple Amplifier
5V 10M 1M 1M 10M 8 0.1F
0.0015 VREG ILOAD 0.1F LOAD 2 8 LTC2053 3 7 6 10k 5 1,4 0.1F
0C 500C TYPE K THERMOCOUPLE (40.6V/C)
YELLOW ORANGE
+ -
0.001F
THERMAL COUPLING
5V
0.1F 5V 1k 1% SCALE FACTOR TRIM
2
LT1025 3 VO R- 4 5 200k
PACKAGE DESCRIPTIO
5.23 (.206) MIN
0.42 0.04 (.0165 .0015) TYP
RECOMMENDED SOLDER PAD LAYOUT DETAIL "A" 0 - 6 TYP 4.90 0.15 (1.93 .006) 3.00 0.102 (.118 .004) NOTE 4
0.254 (.010) GAUGE PLANE
0.18 (.077) SEATING PLANE 0.22 - 0.38 (.009 - .015) TYP 0.13 0.076 (.005 .003)
MSOP (MS8) 0802
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
2053f
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
U
High Side Power Supply Current Sense
10k
3
10k 2 0.001F 1
+ LTC2053 - RG
EN 4 REF 5 6
7 249k 1% 0.1F 100
10mV/C
- +
OUT 100mV/A OF LOAD CURRENT
4
- +
6 1
150
LTC2050 3 2
2053 TA04
2053 TA03
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 0.127 (.035 .005)
3.2 - 3.45 (.126 - .136)
0.65 (.0256) BSC
3.00 0.102 (.118 .004) (NOTE 3)
8
7 65
0.52 (.206) REF
0.53 0.015 (.021 .006) DETAIL "A"
1 1.10 (.043) MAX
23
4 0.86 (.034) REF
0.65 (.0256) BSC
11
LTC2053
TYPICAL APPLICATIO S
Precision /2 (Low Noise 2.5V Reference)
8V 0.1F 8 1 LT1027 4 -5 2 1F 3 3
+ -
1 1k
8 LTC2053 7 6 2.5V (110nV/Hz)
VIN
2
4
5
0.1F
2053 TA05
1.21k 3
PT100* 3-WIRE RTD
RELATED PARTS
PART NUMBER DESCRIPTION LTC1100 LT1101 LT1167 LT1168 LTC1043 LT1789-1 LTC2050 LTC2051 LTC6800 Precision Chopper-Stabilized Instrumentation Amplifier Precision, Micropower, Single Supply Instrumentation Amplifier Single Resistor Gain Programmable, Precision Instrumentation Amplifier Low Power Single Resistor Gain Programmable, Precision Instrumentation Amplifier Dual Precision Instrumentation Switched-Capacitor Building Block Single Supply, Rail-to-Rail Output, Micropower Instrumentation Amplifer Zero-Drift Operation Amplifier Dual Zero-Drift Operational Amplifier Single Supply, Zero Drift, Rail-to-Rail Input and Output Instrumentation Amplifier COMMENTS Fixed Gains of 10 or 100, 10V Offset, 50pA Input Bias Current Fixed Gains of 10 or 100, IS < 105A Single Gain Set Resistor: G = 1 to 10,000, Low Noise: 7.5nVHz ISUPPLY = 530A Rail-to-Rail Input, 120dB CMRR ISUPPLY = 80A Maximum SOT-23 Package MS8 Package MS8 Package, 100V Max VOS, 250nV/C Max Drift
2053f LT/TP 0303 2K * PRINTED IN USA
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
Precision Doubler (General Purpose)
5V 0.1F
Precision Inversion (General Purpose)
5V 0.1F
Precision Current Source
5V
+ -
4
8 LTC2053 7 6 VOUT
VIN
3
+ -
1
8 LTC2053 7 6 VOUT VOUT i R
2
2
1
5
2
4
5
8 LTC2053 RG 7 REF 6 0.1F 3+ 5 EN 4 1 2.7k
-
VOUT = 2VIN 0.1F 0.1F -5V
2053 TA06
0.1F
VOUT = -VIN
2053 TA07
LOAD 10k VC
VC i = -- , i 5mA R 0 < VOUT < (5V - VC) 0.1F
2053 TA08
-5V
Linearized Platinum RTD Amplifier
5V 0.1F 2 *CONFORMING TO IEC751 OR DIN43760 RT = RO (1 + 3.908 * 10-3T - 5.775 * 10-7T2), RO = 100 (e.g. 100 AT 0C, 175.9 AT 200C, 247.1 AT 400C)
- +
1
8 LTC2053 4 5 6 7
0.1F 2.7k 10k 5V 16.9k
i 1mA 5V 2 0.1F 7 6 1M 0.1F 10k CW 24.9k 5k 16.2k
- +
1
8 LTC2053
249k 49.9
LT1634-1.25 10mV/C 0C - 400C (0.1C) 11k CW LINEARITY ZERO 953
2053 TA09
3
4
5
100
39.2k 0.1F GAIN CW
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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