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LT1014D-EP Datasheet, PDF (12/21 Pages) Texas Instruments – QUAD PRECISION OPERATIONAL AMPLIFIER
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LT1014D-EP
SLOS609 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
COMPARATOR APPLICATIONS
The single-supply operation of the LT1014D can be used as a precision comparator with TTL-compatible output.
In systems using both operational amplifiers and comparators, the LT1014D can perform multiple duties (see
Figure 26 and Figure 27).
5
4
10 mV
3
2
1
0
5 mV
2 mV
Over drive
5
4
3
2
10 mV
1
0
VCC+ = 5 V
VCC- = 0
TA = 25°C
5 mV
Overdrive
2 mV
100 mV
VCC+ = 5 V
VCC- = 0
TA = 25°C
0 50 100 150 200 250 300 350 400 450
t - Time - ms
Figure 26. Low-to-High-Level Output Response
for Various Input Overdrives
100 mV
0 50 100 150 200 250 300 350 400 450
t - Time - ms
Figure 27. High-to-Low-Level Output Response
for Various Input Overdrives
LOW-SUPPLY OPERATION
The minimum supply voltage for proper operation of the LT1014D is 3.4 V (three Ni-Cad batteries). Typical
supply current at this voltage is 290 µA; therefore, power dissipation is only 1 mW per amplifier.
OFFSET VOLTAGE AND NOISE TESTING
Figure 31shows the test circuit for measuring input offset voltage and its temperature coefficient. This circuit with
supply voltages increased to ±20 V is also used as the burn-in configuration.
The peak-to-peak equivalent input noise voltage of the LT1014D is measured using the test circuit shown in
Figure 28. The frequency response of the noise tester indicates that the 0.1-Hz corner is defined by only one
zero. The test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds, as this time limit acts as an
additional zero to eliminate noise contribution from the frequency band below 0.1 Hz.
An input noise-voltage test is recommended when measuring the noise of a large number of units. A 10-Hz input
noise-voltage measurement correlates well with a 0.1-Hz peak-to-peak noise reading because both results are
determined by the white noise and the location of the 1/f corner frequency.
Noise current is measured by the circuit and formula shown in Figure 29. The noise of the source resistors is
subtracted.
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