LTC1100
1
1100fc
The LTC
®
1100 is a high precision instrumentation amplifier
using zero-drift techniques to achieve outstanding DC
performance. The input DC offset is typically 1µV while
the DC offset drift is typically 5nV/°C; a very low bias
current of 65pA is also achieved.
The LTC1100 is self-contained; that is, it achieves a differ-
ential gain of 100 without any external gain setting resistor
or trim pot. The gain linearity is 20ppm and the gain drift is
4ppm/°C. The LTC1100 operates from a single 5V supply
up to ±8V. The output typically swings 300mV from its
power supply rails with a 10k load.
An optional external capacitor can be added from Pin 7 to
Pin 8 to tailor the device’s 18kHz bandwidth and to
eliminate any unwanted noise pickup.
The LTC1100 is also offered in a 16-pin surface mount
package with selectable gains of 10 or 100.
The LTC1100 is manufactured using Linear Technology’s
enhanced LTCMOSTM silicon gate process.
Precision, Zero-Drift
Instrumentation Amplifier
■
Offset Voltage: 10µV Max
■
Offset Voltage Drift: 100nV/°C Max
■
Bias Current: 65pA Max
■
Offset Current: 65pA Max
■
Gain Nonlinearity: 20ppm Max
■
Gain Error: ±0.075% Max
■
CMRR: 90dB
■
0.1Hz to 10Hz Noise: 1.9µV
P-P
■
Single 5V Supply Operation
■
8-Pin MiniDIP
■
Thermocouple Amplifiers
■
Strain Gauge Amplifiers
■
Differential to Single-Ended Converters
Single 5V Supply, DC Instrumentation Amplifier
–VIN
0.1µF
0.01µF
1
2
3
4
8
7
6
5
VOUT
VIN
V+ = 5V
VOUT = 100 [VIN – (–VIN)]
LTC1100
LTC1100 • TA01
LTCMOS is a trademark of Linear Technology Corporation
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1100
2
1100fc
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
LTC1100ACN LTC1100CN/CJ
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Gain Error 0.01 0.05 0.01 0.075 ±%
●0.10 0.150 ±%
Gain Nonlinearity 3 8 3 20 ppm
●12 30 12 60 ppm
Input Offset Voltage (Note 2) ±1±10 ±1±10 µV
Input Offset Voltage Drift (Note 2) ●±5±100 ±5±100 nV/°C
Input Noise Voltage DC to 10Hz, T
A
=25°C1.9 1.9 µV
P-P
Input Bias Current 2.5 50 2.5 65 pA
●120 135 pA
Input Offset Current ●10 50 10 65 pA
Common Mode Rejection Ratio V
CM
= 2.3V to −4.7V (Note 3) ●104 115 90 110 dB
Power Supply Rejection Ratio V
S
=±2.375V to ±8V ●120 105 dB
Output Voltage Swing R
L
=2k, V
S
=±8V ●–7.2 6.2 –7.2 6.2 V
R
L
=10k, V
S
=±8V ●–7.7 7.5 –7.7 7.5 V
Supply Current 2.4 2.8 2.4 3.3 mA
●3.4 4.0 3.4 4.5 mA
Internal Sampling Frequency 2.8 2.8 kHz
Bandwidth 18 18 kHz
ORDER PART
NUMBER
LTC1100CSW
ORDER PART
NUMBER
1
2
3
4
5
6
7
8
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
16
15
14
13
12
11
10
9
NC
GND REF
G = 10
CMRR
NC
–VIN
V–
NC
NC
VOUT
G = 10
COMP
NC
VIN
V+
NC
1
2
3
4
8
7
6
5
TOP VIEW
GND REF
CMRR
–V
IN
V
–
V
OUT
COMP
V
IN
V
+
N8 PACKAGE
8-LEAD PDIP
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±±
±±
±5V, RL = 10k, CC = 1000pF, unless otherwise noted.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Operating Temperature Range
LTC1100M/AM (OBSOLETE) ........... −55°C to 125°C
LTC1100C ......................................... −40°C to 85°C
Output Short Circuit Duration ......................... Indefinite
Storage Temperature Range ................ −65°C to 150°C
Total Supply Voltage (V
+
to V
−
)............................. 18V
Input Voltage ....................... (V
+
+ 0.3V) to (V
−
− 0.3V)
Lead Temperature (Soldering, 10 sec)................. 300°C
T
JMAX
= 110°C, θ
JA
= 100°C/W
LTC1100CN8
T
JMAX
= 110°C, θ
JA
= 130°C/W
J PACKAGE
8-LEAD CERDIP
T
JMAX
= 150°C, θ
JA
= 100°C/W
OBSOLETE PACKAGE
Consider the N Package for an Alternate Source
LTC1100CJ8
LTC1100AMJ8
LTC1100MJ8
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
LTC1100
3
1100fc
LTC1100AMJ (Note 4) LTC1100MJ
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Gain Error 0.01 0.05 0.01 0.075 ±%
●0.11 0.150 ±%
Gain Nonlinearity 3 8 3 20 ppm
●40 65 ppm
Input Offset Voltage (Note 2) ±1±10 ±1±10 µV
Input Offset Voltage Drift (Note 2) ●±5±100 ±5±100 nV/°C
Input Noise Voltage DC to 10Hz, T
A
=25°C1.9 1.9 µV
P-P
Input Bias Current 5 50 5 65 pA
●300 450 pA
Input Offset Current ●80 120 pA
Common Mode Rejection Ratio V
CM
=−4.7V to 2.3V ●100 90 dB
Power Supply Rejection Ratio V
S
=±2.375V to ±8V ●115 95 dB
Output Voltage Swing R
L
=10k, V
S
=±8V ●–7.4 7.4 – 7.4 7.4 V
R
L
=2k, V
S
=±8V ●–7.0 6.0 – 7.0 6.0 V
Supply Current 2.4 2.4 3.3 mA
●4.2 4.6 mA
Internal Sampling Frequency 2.8 2.8 kHz
Bandwidth 18 18 kHz
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±±
±±
±5V, RL = 10k, CC = 1000pF, unless otherwise noted.
LTC1100ACS LTC1100CSW
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Gain Error T
A
=25°C, A
V
=100 0.01 0.05 0.01 0.075 ±%
A
V
=100 ●0.10 0.150 ±%
A
V
=10 0.01 0.04 0.01 0.060 ±%
A
V
=10 ●0.10 0.150 ±%
Gain Nonlinearity T
A
=25°C, A
V
=100 3 8 3 20 ppm
A
V
=100 ●12 30 12 60 ppm
A
V
=10 1 8 1 10 ppm
A
V
=10 ●25 40 ppm
Input Offset Voltage (Note 2) ±1±10 ±1±10 µV
Input Offset Voltage Drift (Note 2) ●±5±100 ±5±100 nV/°C
Input Noise Voltage DC to 10Hz, T
A
=25°C1.9 1.9 µV
P-P
Input Bias Current 2.5 50 2.5 65 pA
●120 135 pA
Input Offset Current ●10 50 10 65 pA
Common Mode Rejection Ratio V
CM
=−4.7V to 2.3V,
A
V
=100 ●104 115 90 110 dB
A
V
=10 ●95 85 dB
Power Supply Rejection Ratio V
S
=±2.375V to ±8V ●120 105 dB
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS
= ±±
±±
±5V, RL = 10k, CC
= 1000pF, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
LTC1100
4
1100fc
LTC1100ACS LTC1100CSW
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Output Voltage Swing R
L
=10k, V
S
= ±8V ●–7.2 6.2 – 7.2 6.2 V
R
L
=2k, V
S
=±8V ●–7.7 7.5 – 7.7 7.5 V
Supply Current 2.4 2.8 2.4 3.3 mA
●3.4 4.0 3.4 4.5 mA
Internal Sampling Frequency 2.8 2.8 kHz
Bandwidth G = 100 18 18 kHz
G = 10 180 180 kHz
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. V
OS
is measured to a limit determined by test equipment
capability.
Note 3: See Applications Information, Single Supply Operation.
Note 4: Please consult Linear Technology Marketing.
Gain Error vs Temperature Gain, Phase vs Frequency
Gain Nonlinearity
vs Temperature
LTC1100 • BD0
1
4 (V
–
)
6
R
99R
8
7
5 (V
+
)
R
2
3
99R
1–
+
–
+R = 2.5k
10 (V )
+
LTC1100 • BD02
7 (V )
11
R
90R
15
14
R
6
9R
−
+
–
+
9R
13
–
4
290R
3
R = 2.5k
NOTE: FOR A VOLTAGE GAIN OF 10V/V SHORT PIN 2 TO 3, AND PIN 14 TO 15.
TEMPERATURE (°C)
–50
GAIN ERROR (±%)
0
0.01
0.02
0.03
–25 0 25 50
LTC1100 • TPC01
75 100 125
0.04
0.05
–0.01
V
S
= ±8V
R
L
= 50k
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±±
±±
±5V, RL = 10k, CC
= 1000pF, unless otherwise noted.
TEMPERATURE (°C)
–50
GAIN NONLINEARITY (ppm)
0
5
10
15
–25 0 25 50
LTC1100 • TPC03
75 100 125
20
25
–5
V
S
= ±8V
R
L
= 50k
ELECTRICAL CHARACTERISTICS
BLOCK DIAGRA S
W
TYPICAL PERFOR A CE CHARACTERISTICS
UW
FREQUENCY (Hz)
15
DIFFERENTIAL GAIN (dB)
20
25
30
35
100 10k 100k 1M
LTC1100 • TPC02
1k
40
30
60
90
120
150
180
(G = 100)
GAIN
PHASE
PHASE SHIFT (DEGREES)
45
10
5
0
–30
210
GAIN
(G = 10)
LTC1100
5
1100fc
Power Supply Rejection Ratio Common Mode Range
Supply Current vs Supply Voltage vs Frequency vs Supply Voltage
Undistorted Output Swing
CMRR vs Frequency Output Voltage Swing vs Load vs Frequency
Bias Current vs Internal Sampling Frequency
Common Mode Voltage Voltage Noise vs Frequency vs Supply Voltage
LOAD RESISTANCE (kΩ)
0
VOUT ± SWING (V)
0
±1
±2
±3
1234
LTC1100 • TPC08
567
±4
±5
89
10
±6
±7
±8
NEGATIVE
POSITIVE
NEGATIVE
POSITIVE
POSITIVE
NEGATIVE
±9
±10
VS = ±8V, TA ≤ 85°C
VS = ±5V, TA ≤ 85°C
VS = ±2.5V, TA ≤ 85°C
FREQUENCY (Hz)
0.1
20
0
CMRR (dB)
60
40
100
80
120
110 100 1k
LTC1100 • TPC07
10k 100k
–
+
3
6
1
2
RC
CC
LTC1100
G = 100, RC = 100k
CC = 10pF
G = 10, RC = ∞
CC = 0pF
G = 100, RC = ∞
CC = 0pF
FREQUENCY (Hz)
100
0
PEAK-TO-PEAK OUTPUT SWING (V)
1
3
4
10
1k 10k 100k
LTC1100 • TPC09
2
5
6
7
8
9
R
L
= 100k
R
L
= 2k
V
S
= ±5V
COMMON MODE VOLTAGE (V)
BIAS CURRENT (pA)
300
–180
–120
–60
–5 –4 –3 –2
LTC1100 • TPC10
–1 0 1
0
60
234
120
180
240
VS = ±5V
TA = 25°C
TA = 125°C
TA = –55°C
–6
–200
360
2
4
SAMPLING FREQUENCY (kHz)
1
2
61014
LTC1100 • TPC12
481216
3
T
A
= 25°C
T
A
= –55°C
T
A
= 125°C
18
0
TOTAL SUPPLY VOLTAGE V
+
TO V
–
(V)
FREQUENCY (Hz)
0.1
POWER SUPPLY REJECTION RATIO (dB)
25
50
75
100
110100
LTC1100 • TPC05
1k 10k 100k
125
150
0
TOTAL SUPPLY VOLTAGE V+ TO V– (V)
2
0
SUPPLY CURRENT (mA)
1
2
61014
LTC1100 • TPC04
481216
3
4
TA = –55°C
TA = 25°C
TA = 125°C
18
SUPPLY VOLTAGE (V)
–8
COMMON MODE RANGE (V)
–6
–4
–2
0
2
8
±2 ±4 ±6 ±8
LTC1100 • TPC06
±3 ±5 ±7
4
6
POSITIVE COMMON MODE RANGE
NEGATIVE COMMON MODE RANGE
T
A
= 25°C
FREQUENCY (Hz)
15
VOLTAGE NOISE DENSITY (nV/ Hz)
30
45
60
105
1k 10k 100k
LTC1100 • TPC11
100
√
75
90
0
10
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LTC1100
6
1100fc
Large-Signal Transient Response Small-Signal Transient Response Overload Recovery
G = 100, VS = ±±
±±
±5V G = 100, VS = ±±
±±
±5V G = 100, VS =
±±
±±
±5V
8-Pin DIP (16-Pin SO)
Pin 1 (2) GND REF: Connect to system ground. This sets
the zero reference for the internal op amps.
Pin 2 (4) CMRR: This pin tailors the gain of the internal
amplifiers to maximize AC CMRR. For applications which
emphasize CMRR requirements, connect a 100k resistor
and a 10pF capacitor in series from CMRR to ground. See
the Applications section.
Pin 3 (6) –V
IN
: Inverting Input.
Pin 4 (7) V
–
: Negative Supply.
Pin 5 (10) V
+
: Positive Supply.
Pin 6 (11) V
IN
: Noninverting Input.
Pin 7 (13) COMP: This pin reduces the bandwidth of the
internal amplifiers for applications at or near DC. Clock
feedthrough from the internal sampling clock can also be
suppressed by using the COMP pin. The standard com-
pensation circuit is a capacitor from COMP to V
OUT
, sized
to provide an RC pole with the internal 247k resistor
(22.5k for LTC1100CS in gain-of-10 mode). See the
Applications section.
Pin 8 (15) V
OUT
: Signal Output.
16-Pin SO Package Only
(3) G = 10: Short to pin (2) for gain of 10. Leave
disconnected for gain of 100.
(14) G = 10: Short to pin (15) for gain of 10. Leave
disconnected for gain of 100.
NOTE:
Both
pins must be shorted or open to provide
correct gain.
(1),(5),(8),(9),(12),(16) NC: No Internal Connection.
Large-Signal Transient Response Small-Signal Transient Response Overload Recovery
G = 10 (LTC1100CS Only), VS = ±±
±±
±5V G = 10 (LTC1100CS Only), VS = ±±
±±
±5V G = 10 (LTC1100CS Only), VS = ±±
±±
±5V
1µs/DIV
LTC1100 • TPC18
LTC1100 • TPC16
10µs/DIV
2V/DIV
10µs/DIV
LTC1100 • TPC17
50ms/DIV
10µs/DIV LTC1100 • TPC13 10µs/DIV LTC1100 • TPC14
5µs/DIV
LTC1100 • TPC15
1V/DIV
2V/DIV 50mV/DIV
2V/DIV
2V/DIV
1V/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
UW
UU
U
PI FU CTIO S
LTC1100
7
1100fc
Common Mode Rejection
Due to very precise matching of the internal resistors, no
trims are required to obtain a DC CMRR of better than
100dB; however, things change as frequency rises. The
inverting amplifier is in a gain of 1.01 (1.1 for gain of 10),
while the noninverting amplifier is in a gain of 99 (9 for gain
of 10). As frequency rises, the higher gain amplifier hits its
gain-bandwidth limit long before the low gain amplifier,
degrading CMRR. The solution is straightforward — slow
down the inverting amplifier to match the noninverting
amp. Figure 1 shows the recommended circuit. The prob-
lem is less pronounced in the LTC1100CS in gain-of-10
mode; no CMRR trims are necessary.
Figure 2. Overcompensation to Reduce System Bandwidth
100k
10pF
3
LTC1100 • TA0
2
2
8
6
+
−
+
−
LTC1100
Figure 1. Improving AC CMRR
Overcompensation
Many instrumentation amplifier applications process DC
or low frequency signals only; consequently, the 18kHz
(180kHz for G = 10) bandwidth of the LTC1100 can be
reduced to minimize system errors or reduce transmitted
clock noise by using the COMP pin. A feedback cap from
COMP to V
OUT
will react with the 247k internal resistor
(22.5k for G = 10) to limit the bandwidth, as in Figure 2.
3
LTC1100 • TA03
8
6
+
–
C
7
f =
3dB 1
2 R × C
π
INT
R = 247k FOR G = 100
22.5k FOR G = 10
INT
B
LTC1100
B
Aliasing
The LTC1100 is a chopper-stabilized instrumentation
amplifier; like all sampled systems it exhibits aliasing
behavior for input frequencies at or near the internal
sampling frequency. The LTC1100 incorporates special-
ized anti-aliasing circuitry which typically attenuates
aliasing products by ≥60dB; however, extremely sensi-
tive systems may still have to take precautions to avoid
aliasing errors. For more information, see the LTC1051/
LTC1053 data sheet.
Single Supply Operation
The LTC1100 will operate on a single 5V supply, and the
common mode range of the internal op amps includes
ground; single supply operation is limited only by the
output swing of the op amps. The internal inverting
amplifier has a negative saturation limit of 5mV typically,
setting the minimum common mode limit at 5mV/1.01 (or
1.1 for gain of 10). The inputs can be biased above ground,
as shown in Figure 3. Low cost biasing components can be
used since any errors appear as a common mode term and
are rejected.
The minimum differential input voltage is limited by the
swing of the output op amp. Lightly loaded, it will swing
down to 5mV, allowing differential input voltages as low as
50µV (450µV for gain of 10). Single supply operation
limits the LTC1100 to positive differential inputs only;
negative inputs will give a saturated zero output.
3
5V
LTC1100 • TA0
4
8
6
−
+
OUTPUT
0V TO 5V
SENSOR
R
BIAS
5
4, 1
5V
1N4148
LTC1100
Figure 3
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
APPLICATIO S I FOR ATIO
WUUU
LTC1100
8
1100fc
LW/TP 1202 1K REV C • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1994
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
J8 0801
.014 – .026
(0.360 – 0.660)
.015 – .060
(0.381 – 1.524)
.125
3.175
MIN
.100
(2.54)
BSC
.300 BSC
(7.62 BSC)
.008 – .018
(0.203 – 0.457) 0° – 15°
.045 – .065
(1.143 – 1.651)
.045 – .068
(1.143 – 1.650)
FULL LEAD
OPTION
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
CORNER LEADS OPTION
(4 PLCS)
.200
(5.080)
MAX
.005
(0.127)
MIN
.405
(10.287)
MAX
.220 – .310
(5.588 – 7.874)
1234
87
65
.025
(0.635)
RAD TYP
NOTE: LEAD DIMENSIONS APPLY TO SOLDER
DIP/PLATE OR TIN PLATE LEADS
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
OBSOLETE PACKAGE
S16 (WIDE) 0502
NOTE 3
.398 – .413
(10.109 – 10.490)
NOTE 4
16 15 14 13 12 11 10 9
1
N
2345678
N/2
.394 – .419
(10.007 – 10.643)
.037 – .045
(0.940 – 1.143)
.004 – .012
(0.102 – 0.305)
.093 – .104
(2.362 – 2.642)
.050
(1.270)
BSC .014 – .019
(0.356 – 0.482)
TYP
0° – 8° TYP
NOTE 3
.009 – .013
(0.229 – 0.330)
.005
(0.127)
RAD MIN
.016 – .050
(0.406 – 1.270)
.291 – .299
(7.391 – 7.595)
NOTE 4
× 45°
.010 – .029
(0.254 – 0.737)
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
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)
.420
MIN
.325 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
N
123 N/2
.050 BSC
.030 ±.005
TYP
U
PACKAGE DESCRIPTIO
N8 1002
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.120
(3.048)
MIN
12 34
87 65
.255 ± .015*
(6.477 ± 0.381)
.400*
(10.160)
MAX
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
.100
(2.54)
BSC
NOTE:
1. DIMENSIONS
*THESE DIMENSIONS
DO NOT INCLUDE
MOLD FLASH OR
PROTRUSIONS.
MOLD FLASH OR
PROTRUSIONS
SHALL NOT EXCEED
.010 INCH (0.254mm)
INCHES
MILLIMETERS
ARE
