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TLC27M4 Datasheet(PDF) 18 Page - Texas Instruments

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Part No. TLC27M4
Description  LinCMOSE PRECISION QUAD OPERATIONAL AMPLIFIERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLC27M4 Datasheet(HTML) 18 Page - Texas Instruments

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TLC27M4, TLC27M4A, TLC27M4B, TLC27M4Y, TLC27M9
LinCMOS
™ PRECISION QUAD OPERATIONAL AMPLIFIERS
SLOS093C – OCTOBER 1987 – REVISED MAY 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
input bias current
Because of the high input impedance of the TLC27M4 and TLC27M9 operational amplifiers, attempts to
measure the input bias current can result in erroneous readings. The bias current at normal room ambient
temperature is typically less than 1 pA, a value that is easily exceeded by leakages on the test socket. Two
suggestions are offered to avoid erroneous measurements:
1.
Isolate the device from other potential leakage sources. Use a grounded shield around and between
the device inputs (see Figure 4). Leakages that would otherwise flow to the inputs are shunted away.
2.
Compensate for the leakage of the test socket by actually performing an input bias current test (using
a picoammeter) with no device in the test socket. The actual input bias current can then be calculated
by subtracting the open-socket leakage readings from the readings obtained with a device in the test
socket.
One word of caution—many automatic testers as well as some bench-top operational amplifier testers use the
servo-loop technique with a resistor in series with the device input to measure the input bias current; the voltage
drop across the series resistor is measured and the bias current is calculated. This method requires that a device
be inserted into the test socket to obtain a correct reading; therefore, an open-socket reading is not feasible
using this method.
V = VIC
14
8
1
7
Figure 4. Isolation Metal Around Device Inputs
(J and N packages)
low-level output voltage
To obtain low-supply-voltage operation, some compromise was necessary in the input stage. This compromise
results in the device low-level output being dependent on both the common-mode input voltage level as well
as the differential input voltage level. When attempting to correlate low-level output readings with those quoted
in the electrical specifications, these two conditions should be observed. If conditions other than these are to
be used, please refer to Figures 14 through 19 in the
Typical Characteristics of this data sheet.


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