Instrumentation Amplifiers
InfoCard 2
LTC1043
PARAMETER (USING LTC1050 AMPLIFIER)
Offset 0.5µV
Offset Drift 50nV/°C
Bias Current 10pA
Noise (0.1Hzk to 10Hz) 1.6µV
Gain Resistor Programmable
Gain Error Resistor Limited 0.001% Possible
Gain Drift Resistor Limited <1ppm/°C Possible
Gain Nonlinearity Resistor Limited 1ppm Possible
CMRR 120dB
Power Supply Single, Dual (18V, ±9V Max)
Supply Current 2mA
Slew Rate 1mV/ms
Bandwidth 10Hz
FREQUENCY OF COMMON-MODE SIGNAL (Hz)
(LTC1043 w/LT1013)
100
CMRR (dB)
100
120
140
1k 10k 100k
80
60
40
20
C
S
= C
h
=
1µF
1
4
8
5V
DIFFERENTIAL
INPUT –15V
–
+
LT1077 V
OUT
1µF
R2
C
H
1µF
8
11
12
C
S
1µF
(EXTERNAL)
7
13
17
16
0.01µF
–5V
R1
14
4
5V
1/2 LTC1043
CMRR > 120dB AT DC
CMRR > 120dB AT 60Hz
DUAL SUPPLY OR SINGLE 5V
V
OS
= 150µV, GAIN = 1 + R2/R1
∆V
OS
/∆T = 2µV/°C
COMMON-MODE INPUT VOLTAGE
INCLUDES THE SUPPLIES
3
2
Instrumentation Amplifier
■Up to 120dB CMRR
■Adjustable Gain-Set by Output Op Amp
■Offset and Offset Drift as Low as Output Amp Specs
Complete Instrumentation Amplifiers in 8-Pin Packages
■Precise, Charge-Balanced Switching
■Up to 5MHz Clock Rate
■Internal or External Clock
LTC1100A LT1101A LT1102A
PARAMETER V
S
= ±5V V
S
= 5V V
S
= ±15V
Offset (Max) 10µV 160µV 600µV
Offset Drift (Max) 100nV/°C2µV/°C8µV/°C
Bias Current (Max) 50pA 8nA 40pA
Noise (0.1Hz to 10Hz) 1.9µV
P-P
Typ 0.9µV
P-P
Typ 2.8µV
P-P
Typ
Gain 100/10 (SW PKG) 10/100 10/100
Gain Error (Max) 0.05% 0.05% 0.05%
Gain Drift 4ppm/°C Typ 4ppm/°C Max 18ppm/°C Max
Gain Nonlinearity (Max) 8ppm 8ppm 14ppm
CMRR (G = 100)(Min) 104dB 95dB 84dB
Power Supply (Max) Single, Dual, 16V Single, Dual, 44V Dual, 44V
Supply Current (Max) 2.8mA 130µA 5mA
Slew Rate 1.5V/µs Typ 0.06V/µs Min 21V/µs Min (6:10)
Bandwidth (G = 10) 18kHz Typ 22kHz Min 2MHz Min
■LTC1100: Zero Offset, Drift; Gain of 100
■LT1101: Micropower, Single Supply; Gain of 10 or 100
■LT1102: High Speed JFET Input; Gain of 10 or 100
TRANSDUCER
OR SENSOR
RESISTANCE
BRIDGE
6
3
1
4
8
5
OUT
V+
R
R
R
R
SHIELD
–
+
LT1101
G = 100
MINIMUM VOLTAGE ACROSS BRIDGE = 20mV
MINIMUM SUPPLY VOLTAGE = 1.8V
6
3
1
4
8
7BIAS
V
–
= –15V
–
+
LT1102 LT1010 OUT
V
+
= 15V
OUTPUT = ±10V INTO 75Ω TO 330kHz (R = 50Ω)
±10V INTO 200Ω TO 330kHz (R = 200Ω)
DRIVES 2.2nF CAP LOAD
GAIN = 10, DEGRADED 0.01% DUE TO LT1010
2
5R
1
2
3
45
6
7
8
TOP VIEW
GROUND
(REF)
COMP
OUTPUT
+CMRR
–IN
N8 PACKAGE
8-LEAD PLASTIC DIP
–
+
–
+
J8 PACKAGE
8-LEAD CERAMIC DIP
V
–
+IN
V
+
99R
RR
R ≈ 2.5k
99R
Dual Precision Instrumentation Switched Capacitor Building Block: LTC1043
©1994 LT/TP 0298 10K
1
2
3
45
6
7
8
TOP VIEW
GROUND
(REF)
OUT
G = 10
OUTPUT
REF
G = 10
–IN
N8 PACKAGE
8-LEAD PLASTIC DIP
–
+
–
+
J8 PACKAGE
8-LEAD CERAMIC DIP
V
–
+IN
V
+
99R
RR
R ≈ 9.2k (LT1101)
R ≈ 1.8k (LT1102)
99R
9R
9R
Differential Voltage Amplification from a
Resistance Bridge (Single 5V Powered) Wideband Instrumentation Amplifier
with ±150mA Output Current
CMRR vs Frequency
LTC1100CS
1
2
3
4
5
6
7
8
TOP VIEW
G = 10
GND REF
NC
+CMRR
S PACKAGE
16-LEAD PLASTIC SW
9
16
15
14
13
12
11
10
NC
V
–
–V
IN
NC
G = 10
V
OUT
NC
COMP
NC
V
+
+V
IN
NC
LTC1100 LT1101/LT1102
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR