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TLC372-EP датащи(PDF) 5 Page - Texas Instruments

номер детали TLC372-EP
подробное описание детали  LinCMOS??DUAL DIFFERENTIAL COMPARATORS
Download  18 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

TLC372-EP датащи(HTML) 5 Page - Texas Instruments

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R6
5.1 k
Buffer
U1b
1/4 TLC274C
R1
240 k
C2
1
µF
R4
47 k
U1a
1/4 TLC274CN
U1c
1/4 TLC274CN
R2
10 k
R3
100 k
C1
0.1
µF
R10
100 k
Ω, 1%
R9
10 k
Ω, 1%
R7
1 M
R8
1.8 k
Ω, 1%
R5
1.8 k
Ω, 1%
VDD
DUT
Integrator
VIO
(X100)
C3
0.68
µF
C4
0.1
µF
Triangle
Generator
+
TLC372-EP
LinCMOS™ DUAL DIFFERENTIAL COMPARATORS
SGLS385 – MARCH 2007
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 2 illustrates a practical circuit for direct dc measurement of input offset voltage that does not bias the
comparator into the linear region. The circuit consists of a switching-mode servo loop in which U1a generates a
triangular waveform of approximately 20-mV amplitude. U1b acts as a buffer, with C2 and R4 removing any
residual dc offset. The signal is then applied to the inverting input of the comparator under test, while the
noninverting input is driven by the output of the integrator formed by U1c through the voltage divider formed by
R9 and R10. The loop reaches a stable operating point when the output of the comparator under test has a duty
cycle of exactly 50%, which can only occur when the incoming triangle wave is sliced symmetrically or when the
voltage at the noninverting input exactly equals the input offset voltage.
Figure 2. Circuit for Input Offset Voltage Measurement
Voltage divider R9 and R10 provides a step up of the input offset voltage by a factor of 100 to make
measurement easier. The values of R5, R8, R9, and R10 can significantly influence the accuracy of the reading;
therefore, it is suggested that their tolerance level be 1% or lower.
Measuring the extremely low values of input current requires isolation from all other sources of leakage current
and compensation for the leakage of the test socket and board. With a good picoammeter, the socket and board
leakage can be measured with no device in the socket. Subsequently, this open-socket leakage value can be
subtracted from the measurement obtained with a device in the socket to obtain the actual input current of the
device.
5
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