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TLC139MJ Folha de dados(PDF) 8 Page - Texas Instruments |
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TLC139MJ Folha de dados(HTML) 8 Page - Texas Instruments |
8 / 17 page TLC139, TLC339, TLC339Q LinCMOS ™ MICROPOWER QUAD COMPARATORS SLCS119 – DECEMBER 1986 – REVISED JANUARY 1991 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION A close approximation of the input offset voltage can be obtained by using a binary search method to vary the differential input voltage while monitoring the output state. When the applied input voltage differential is equal but opposite in polarity to the input offset voltage, the output changes state. 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. 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. + – + – + – Dut Buffer R1 240 k Ω R2 10 k Ω R3 100 k Ω R4 47 k Ω R5 1.8 k Ω, 1% R3 5.1 k Ω R7 1 M Ω R8 1.8 k Ω, 1% R9 10 k Ω, 1% R10 100 Ω, 1% C1 0.1 µF C2 1 µF C3 0.68 µF C4 0.1 µF U1C 1/4 TLC274CN U1A 1/4 TLC274CN Triangle Generator U1B 1/4 TLC274CN Integrator VIO (X100) VDD Figure 2. Circuit for Input Offset Voltage Measurement 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. |
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