LT1077_1 Datasheet, PDF (11/16 Pages) Linear Technology – Micropower, Single Supply, Precision Op Amp

LT1077
APPLICATIO S I FOR ATIO
Comparator Applications
The single supply operation of the LT1077 and its
ability to swing close to ground while sinking current,
lends itself to use as a precision comparator with
TTL compatible output.
Comparator Rise Response Time
to 10mV, 5mV, 2mV Overdrive
4
2
0
0
–100
V_S = 5V, 0V 200µs/DIV
Comparator Fall Response Time
to 10mV, 5mV, 2mV Overdrive
4
2
0
100
0
V_S = 5V, 0V 200µs/DIV
TYPICAL APPLICATIO S
Megaohm Input Impedance
Gain of 10 Difference Amplifier
10M
– ^{1M 2}
INPUT
+ ^{1M 3}
10M
3V
7
6 _OUTPUT
0.005 TO 2.4V
4
BANDWIDTH = 20KHZ
OUTPUT OFFSET = 0.7mV
OUTPUT NOISE = 80µVPP (0.1Hz TO 10Hz)
260µV_RMS OVER FULL BANDWIDTH
SUPPLY CURRENT = 45µA
THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT
THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE.
THE PICO-AMPERE OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT1077
ALLOWS THE USE OF 1M SOURCE RESISTORS WITHOUT DEGRADATION IN
PERFORMANCE. IN ADDITION, WITH MEGAOHM RESISTORS MICROPOWER
OPERATION CAN BE MAINTAINED
LT1077 • TA03
1077fa
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