Meets IEC 1000-4-2 Level 4 ESD Tests with
Two External 5k Resistors
■
Single Gain Set Resistor: G = 1 to 10,000
■
Gain Error: G = 10, 0.4% Max
■
Input Offset Voltage Drift: 0.3µV/°C Max
■
Gain Nonlinearity: G = 10, 20ppm Max
■
Input Offset Voltage: 40µV Max
■
Input Bias Current: 250pA Max
■
PSRR at AV =1: 103dB Min
■
CMRR at AV = 1: 90dB Min
■
Wide Supply Range: ±2.3V to ±18V
■
1kHz Voltage Noise: 10nV/√Hz
■
0.1Hz to 10Hz Noise: 0.28µV
■
Available in 8-Pin PDIP and SO Packages
P-P
U
APPLICATIOS
■
Bridge Amplifiers
■
Strain Gauge Amplifiers
■
Thermocouple Amplifiers
■
Differential to Single-Ended Converters
■
Differential Voltage to Current Converters
■
Data Acquisition
■
Battery-Powered and Portable Equipment
■
Medical Instrumentation
■
Scales
Precision Instrumentation Amplifier
DESCRIPTIO
U
March 2000
The LT®1168 is a micropower, precision instrumentation
amplifier that requires only one external resistor to set gains
of 1 to 10,000. The low voltage noise of 10nV/√Hz (at 1kHz)
is not compromised by low power dissipation (350µA typical
for ±15V supplies). The wide supply range of ±2.3V to ±18V
allows the LT1168 to fit into a wide variety of industrial as well
as battery-powered applications.
The high accuracy of the LT1168 is due to a 20ppm maximum
nonlinearity and 0.4% max gain error (G = 10). Previous
monolithic instrumentation amps cannot handle a 2k load
resistor whereas the nonlinearity of the LT1168 is specified
for loads as low as 2k. The LT1168 is laser trimmed for very
low input offset voltage (40µV max), drift (0.3µV/°C), high
CMRR (90dB, G = 1) and PSRR (103dB, G = 1). Low input
bias currents of 250pA max are achieved with the use of
superbeta processing. The output can handle capacitive
loads up to 1000pF in any gain configuration while the inputs
are ESD protected up to 13kV (human body). The LT1168
with two external 5k resistors passes the IEC 1000-4-2 level
4 specification.
The LT1168 is a pin-for-pin improved second source for the
AD620 and INA118. The LT1168, offered in 8-pin PDIP and
SO packages, requires significantly less PC board area than
discrete op amp resistor designs. These advantages make
the LT1168 the most cost effective solution for precision
instrumentation amplifier applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V
1
3.5k
3.5k
*See Theory of Operation section
3.5k
G = 200
3.5k
249Ω
3
8
R1
1
2
U
Single Supply* Pressure Monitor
+
LT1168
–
4
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.
BI TECHNOLOGIES
67-8-3 R40KQ, (0.02% RATIO MATCH)
7
5
40k
6
20k
3
+
40k
1/2
LT1112
2
–
REF
IN
1
AGND
LTC
ADC
®
1286
DIGITAL
DATA
OUTPUT
1168 TA01
Gain Nonlinearity
NONLINEARITY (100ppm/DIV)
G = 1000OUTPUT VOLTAGE (2V/DIV)
RL = 2K
V
= ±10V
OUT
1168 TA01a
1
LT1168
1
2
3
4
8
7
6
5
TOP VIEW
R
G
–IN
+IN
–V
S
R
G
+V
S
OUTPUT
REF
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
+
–
WW
W
U
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage ...................................................... ±20V
G = 10 (Note 7)0.040.40.050.5%
G = 100 (Note 7)0.040.50.050.6%
G = 1000 (Note 7)0.080.50.080.6%
Gain Nonlinearity (Notes 7, 8)VO = ±10V, G = 126310ppm
V
= ±10V,G = 10 and 10010201525ppm
O
= ±10V, G = 100020402560ppm
V
O
VO = ±10V, G = 1, RL = 2k415520ppm
= ±10V,G = 10 and 100, RL = 2k20403060ppm
V
O
= ±10V, G = 1000, RL = 2k40755090ppm
V
O
V
OST
V
OSI
V
OSO
I
OS
I
B
e
n
i
n
R
IN
2
Total Input Referred Offset Voltage V
Input Offset VoltageG = 1000, VS = ±5V to ±15V15402060µV
Output Offset VoltageG = 1, VS = ±5V to ±15V4020050300µV
Input Offset Current90300100450pA
Input Bias Current4025080500pA
Input Noise Voltage, RTI0.1Hz to 10Hz, G = 12.002.00µV
Input Noise Voltage Density, RTIfO = 1kHz10151015nV/√Hz
Output Noise Voltage Density, RTI fO = 1kHz (Note 9)165220165220nV/√Hz
Input Noise CurrentfO = 0.1Hz to 10Hz55pA
Input Noise Current DensityfO = 10Hz7474fA/√Hz
Input ResistanceVIN = ±10V30010002001000GΩ
= V
OST
0.1Hz to 10Hz, G = 10000.280.28µV
TA = 25°C. VS = ±15V, VCM = 0V, RL = 10k unless otherwise noted.
LT1168AC/LT1168AILT1168C/LT1168I
+ V
OSO
/G
OSI
P-P
P-P
P-P
LT1168
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETERCONDITIONS (Note 6)MINTYPMAXMINTYPMAXUNITS
C
IN(DIFF)
C
IN(CM)
V
CM
CMRRCommon Mode1k Source Imbalance,
PSRRPower SupplyVS = ±2.3V to ±18V
I
S
V
OUT
I
OUT
BWBandwidthG = 1400400kHz
SRSlew RateG = 1, V
REFINReference Input Resistance6060kΩ
I
REFIN
V
REF
A
VREF
Differential Input CapacitancefO = 100kHz1.61.6pF
Common Mode InputfO = 100kHz1.61.6pF
Capacitance
Input Voltage RangeG = 1, Other Input Grounded
The ● denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C temperature range. VS = ±15V, VCM = 0V, RL = 10k unless
otherwise noted. (Note 8)
LT1168AILT1168I
SYMBOL PARAMETERCONDITIONS (Note 6)MINTYPMAXMINTYPMAXUNITS
Gain ErrorG = 1●0.0140.040.0150.05%
G = 10 (Note 7)
G = 100 (Note 7)
G = 1000 (Note 7)
G
N
Gain NonlinearityVO = ±10V, G = 1●320525ppm
(Notes 7, 8)V
= ±10V, G = 10 and 100●10351540ppm
O
VO = ±10V, G = 1000
●0.6001.90.7002.0%
●0.6002.00.7002.1%
●0.6002.10.7002.2%
●307035100ppm
G/TGain vs TemperatureG < 1000 (Note 7)●100200100200ppm/°C
4
LT1168
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C temperature range. VS = ±15V, VCM = 0V, RL = 10k unless
otherwise noted. (Note 5)
LT1168AILT1168I
SYMBOL PARAMETERCONDITIONS (Note 6)MINTYPMAXMINTYPMAXUNITS
V
OST
V
OSI
V
OSIH
V
OSO
V
OSOH
V
OSI
V
OSO
I
OS
IOS/TInput Offset Current Drift●0.30.3pA/°C
I
B
IB/TInput Bias Current Drift●1.41.4pA/°C
V
CM
CMRRCommon Mode1k Source Imbalance,
PSRRPower SupplyVS = ±2.3V to ±18V
I
S
V
OUT
I
OUT
SRSlew Rate●0.220.410.220.42V/µs
V
REF
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be imparied.
Note 2: If the input voltage exceeds the supplies, the input current should
be limited to less than 20mA.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 4: The LT1168AC/LT1168C are guaranteed functional over the
operating temperature range of –40°C and 85°C.
Note 5: The LT1168AC/LT1168C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1168AC/LT1168C are designed,
characterized and expected to meet specified performance from –40°C
and 85°C but are not tested or QA sampled at these temperatures. The
LT1168AI/LT1168I are guaranteed to meet specified performance from
–40°C to 85°C.
Total Input Referred Offset VoltageV
OST
= V
OSI
+ V
OSO
/G
Input Offset Voltage●207525100µV
Input Offset Voltage Hysteresis(Notes 7, 10)●3.03.0µV
Output Offset Voltage●180500200600µV
Output Offset Voltage Hysteresis (Notes 7, 10)●3030µV
Note 6: Typical parameters are defined as the 60% of the yield parameter
distribution.
Note 7: Does not include the tolerance of the external gain resistor RG.
Note 8: This parameter is measured in a high speed automatic tester that
does not measure the thermal effects with longer time constants. The
magnitude of these thermal effects are dependent on the package used,
heat sinking and air flow conditions.
Note 9: This parameter is not 100% tested.
Note 10: Hysteresis in offset voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Offset voltage hysteresis is always measured at 25°C, but
the IC is cycled to 85°C I-grade (or 70°C C-grade) or –40°C I-grade
(0°C C-grade) before successive measurement. 60% of the parts will
pass the typical limit on the data sheet.
5
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