LT1996_15 Datasheet, PDF (1/24 Pages) Linear Technology – Precision, 100A Gain Selectable Amplifier

FEATURES
■ _{Pin Configurable as a Difference Amplifier,}
Inverting and Noninverting Amplifier
■ _{Difference Amplifier}
Gain Range 9 to 117
CMRR >80dB
■ _{Noninverting Amplifier}
Gain Range 0.008 to 118
■ _{Inverting Amplifier}
Gain Range –0.08 to –117
■ _{Gain Error: <0.05%}
■ _{Gain Drift: < 3ppm/°C}
■ _{Wide Supply Range: Single 2.7V to Split ±18V}
■ _{Micropower Operation: 100µA Supply}
■ _{Input Offset Voltage: 50µV (Max)}
■ _{Gain Bandwidth Product: 560kHz}
■ _{Rail-to-Rail Output}
■ _{Space Saving 10-Lead MSOP and DFN Packages}
U
APPLICATIO S
■ _{Handheld Instrumentation}
■ _{Medical Instrumentation}
■ _{Strain Gauge Amplifiers}
■ _{Differential to Single-Ended Conversion}
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents Pending.
LT1996
Precision, 100µA
Gain Selectable Amplifier
DESCRIPTIO
The LT^®1996 combines a precision operational amplifier
with eight precision resistors to form a one-chip solution
for accurately amplifying voltages. Gains from –117 to
118 with a gain accuracy of 0.05% can be achieved without
any external components. The device is particularly well
suited for use as a difference amplifier, where the excellent
resistor matching results in a common mode rejection
ratio of greater than 80dB.
The amplifier features a 50µV maximum input offset
voltage and a gain bandwidth product of 560kHz. The
device operates from any supply voltage from 2.7V to 36V
and draws only 100µA supply current on a 5V supply. The
output swings to within 40mV of either supply rail.
The internal resistors have excellent matching character-
istics; variation is 0.05% over temperature with a guaran-
teed matching temperature coefficent of less than 3ppm/°C.
The resistors are also extremely stable over voltage,
exhibiting a nonlinearity of less than 10ppm.
The LT1996 is fully specified at 5V and ±15V supplies and
from –40°C to 85°C. The device is available in space
saving 10-lead MSOP and DFN packages. For an amplifier
with selectable gains from –13 to 14, see the LT1991 data
sheet.
TYPICAL APPLICATIO
V_M(IN) ^–
∆V_IN
+
V_P(IN)
INPUT RANGE
±60V
R_IN = 100kΩ
Rail-to-Rail Gain = 9 Difference Amplifier
15V
450k/81
450k/27
450k/9
450k/9
450k/27
450k/81
450k
4pF
–
+
4pF
LT1996
450k
V_OUT = V_REF + 9 • ∆V_IN
SWING 40mV TO
EITHER RAIL
–15V
V_REF
1996 TA01
Distribution of Resistor Matching
40 _LT1996A
35 ^{G = 81}
30
25
20
15
10
5
0
– 0.04
– 0.02
0
0.02
0.04
RESISTOR MATCHING (%)
1996 TA01b
1996f
1