LT1678_15 Datasheet, PDF (1/16 Pages) Linear Technology – Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps

LT1678/LT1679
Dual/Quad Low Noise,
Rail-to-Rail, Precision Op Amps
FEATURES
■ _{Rail-to-Rail Input and Output}
■ _{100% Tested Low Voltage Noise:}
3.9nV/√Hz Typ at 1kHz
5.5nV/√Hz Max at 1kHz
■ _{Single Supply Operation from 2.7V to 36V}
■ _{Offset Voltage: 100µV Max}
■ _{Low Input Bias Current: 20nA Max}
■ _{High AVOL: 3V/µV Min, RL = 10k}
■ _{High CMRR: 100dB Min}
■ _{High PSRR: 106dB Min}
■ _{Gain Bandwidth Product: 20MHz}
■ _{Operating Temperature Range: – 40°C to 85°C}
■ _{Matching Specifications}
■ _{No Phase Inversion}
■ _{8-Lead SO and 14-Lead SO Packages}
U
APPLICATIO S
■ _{Strain Gauge Amplifiers}
■ _{Portable Microphones}
■ _{Battery-Powered Rail-to-Rail Instrumentation}
■ _{Low Noise Signal Processing}
■ _{Microvolt Accuracy Threshold Detection}
■ _{Infrared Detectors}
DESCRIPTIO
The LT^®1678/LT1679 are dual/quad rail-to-rail op amps
offering both low noise and precision: 3.9nV/√Hz wideband
noise, 1/f corner frequency of 4Hz and 90nV peak-to-peak
0.1Hz to 10Hz noise are combined with outstanding
precision: 100µV maximum offset voltage, greater than
100dB common mode and power supply rejection and
20MHz gain bandwidth product. The LT1678/LT1679 bring
precision as well as low noise to single supply applications as
low as 3V. The input range exceeds the power supply by
100mV with no phase inversion while the output can swing
to within 170mV of either rail.
The LT1678/LT1679 are offered in the SO-8 and SO-14
packages. A full set of matching specifications are also
provided, facilitating their use in matching dependent appli-
cations such as a two op amp instrumentation amplifier
design. The LT1678/LT1679 are specified for supply volt-
ages of ±15V, single 5V as well as single 3V. For a single
amplifier with similiar performance, see the LT1677 data
sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Instrumentation Amplifier with Shield Driver
GUARD
+
INPUT _–
3₊
1/4
LT1679
2_–
1
1k
R_F
3.4k
R_G
10 ^100Ω
8
1/4
LT1679
9
R_G
100Ω
30k
15V
5₊
4
1/4
6
LT1679
– ₁₁
–15V
7
OUTPUT
30k
GUARD
GAIN = 1000
13 _–
R_F
3.4k
1/4
14
16789 TA01
LT1679
12 ₊
1k
0.1Hz to 10Hz Voltage Noise
V_S = ±2.5V
0
2
4
6
8
10
TIME (sec)
16789 TA01b
sn16789 16789fs
1