LT1677_1 Datasheet, PDF (1/20 Pages) Linear Technology – Low Noise, Rail-to-Rail Precision Op Amp

LT1677
Low Noise, Rail-to-Rail
Precision Op Amp
FEATURES
■ _{Rail-to-Rail Input and Output}
■ _{100% Tested Low Voltage Noise:}
3.2nV/√Hz Typ at 1kHz
4.5nV/√Hz Max at 1kHz
■ _{Offset Voltage: 60µV Max}
■ _{Low VOS Drift: 0.2µV/°C Typ}
■ _{Low Input Bias Current: 20nA Max}
■ _{Wide Supply Range: 3V to ±18V}
■ _{High AVOL: 7V/µV Min, RL = 10k}
■ _{High CMRR: 109dB Min}
■ _{High PSRR: 108dB Min}
■ _{Gain Bandwidth Product: 7.2MHz}
■ _{Slew Rate: 2.5V/µs}
■ _{Operating Temperature Range: – 40°C to 85°C}
U
APPLICATIO S
■ _{Low Noise Signal Processing}
■ _{Microvolt Accuracy Threshold Detection}
■ _{Strain Gauge Amplifiers}
■ _{Tape Head Preamplifiers}
■ _{Direct Coupled Audio Gain Stages}
■ _{Infrared Detectors}
■ _{Battery-Powered Microphones}
DESCRIPTIO
The LT^®1677 features the lowest noise performance avail-
able for a rail-to-rail operational amplifier: 3.2nV/√Hz
wideband noise, 1/f corner frequency of 13Hz and 90nV
peak-to-peak 0.1Hz to 10Hz noise. Low noise is combined
with outstanding precision: 20µV offset voltage and
0.2µV/°C drift, 130dB common mode and power supply
rejection and 7.2MHz gain bandwidth product. The com-
mon mode range exceeds the power supply by 100mV.
The voltage gain of the LT1677 is extremely high, 19 million
(typical) driving a 10k load.
In the design, processing and testing of the device, particular
attention has been paid to the optimization of the entire
distribution of several key parameters. Consequently, the
specifications have been spectacularly improved compared
to competing rail-to-rail amplifiers.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3V Electret Microphone Amplifier
PANASONIC
ELECTRET
CONDENSER
MICROPHONE
WM-61
www.panasonic.com/pic
[phone]
1.5V
A_V = –100
R3
1M
R1
10k
C1
0.68µF
R2
10k
1.5V
2–
7
23Hz
HIGHPASS
LT1677
3+
4
–1.5V
TO PA
OR
HEADPHONES
6
1677 TA01
Distribution of Offset Voltage
25
T_A = 25°C
V_S = ±15V
20
15
10
5
0
–40 –30 –20 –10 0 10 20 30 40
INPUT OFFSET VOLTAGE (µV)
1677 TA02
1677fa
1