LT1014DMDWG4 Datasheet, PDF (19/32 Pages) Texas Instruments – QUAD PRECISION OPERATIONAL AMPLIFIERS

LT1014, LT1014A, LT1014D
QUAD PRECISION OPERATIONAL AMPLIFIERS
SLOS039D − JULY 1989 − REVISED AUGUST 2009
APPLICATION INFORMATION
comparator applications
The single-supply operation of the LT1014 can be used as a precision comparator with TTL-compatible output.
In systems using both operational amplifiers and comparators, the LT1014 can perform multiple duties (see
Figures 25 and 26).
5
5
4
4
10 mV
5 mV
2 mV
3
3
V_CC+ = 5 V
V_CC− = 0
T_A = 25°C
2
2
Overdrive
10 mV
5 mV
2 mV
1
1
Overdrive
0
0
100 mV
V_CC+ = 5 V
V_CC− = 0
T_A = 25°C
0 50 100 150 200 250 300 350 400 450
t − Time − µs
Figure 25. Low-to-High-Level Output Response
for Various Input Overdrives
100 mV
0 50 100 150 200 250 300 350 400 450
t − Time − µs
Figure 26. High-to-Low-Level Output Response
for Various Input Overdrives
low-supply operation
The minimum supply voltage for proper operation of the LT1014 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 30 shows 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 LT1014 is measured using the test circuit shown in
Figure 27. 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 28. The noise of the source resistors is
subtracted.
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