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LM13700N データシート(PDF) 10 Page - Texas Instruments

部品番号 LM13700N
部品情報  Dual Operational Transconductance Amplifiers
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ホームページ  http://www.ti.com
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LM13700N データシート(HTML) 10 Page - Texas Instruments

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LM13700
SNOSBW2F – NOVEMBER 1999 – REVISED NOVEMBER 2015
www.ti.com
Feature Description (continued)
Collector currents I4 and I5 are not very useful by themselves and it is necessary to subtract one current from the
other. The remaining transistors and diodes form three current mirrors that produce an output current equal to I5
minus I4 thus:
(5)
The term in brackets is then the transconductance of the amplifier and is proportional to IABC.
7.3.2 Linearizing Diodes
For differential voltages greater than a few millivolts, Equation 3 becomes less valid and the transconductance
becomes increasingly nonlinear. Figure 19 demonstrates how the internal diodes can linearize the transfer
function of the amplifier. For convenience assume the diodes are biased with current sources and the input
signal is in the form of current IS. Since the sum of I4 and I5 is IABC and the difference is IOUT, currents I4 and I5 is
written as follows:
(6)
Since the diodes and the input transistors have identical geometries and are subject to similar voltages and
temperatures, the following is true:
(7)
Notice that in deriving Equation 7 no approximations have been made and there are no temperature-dependent
terms. The limitations are that the signal current not exceed ID / 2 and that the diodes be biased with currents. In
practice, replacing the current sources with resistors will generate insignificant errors.
7.4 Device Functional Modes
Use in single ended or dual supply systems requires minimal changes. The outputs can support a sustained
short to ground. Note that use of the LM13700 in ±5 V supply systems requires will reduce signal dynamic range;
this is due to the PNP transistors having a higher VBE than the NPN transistors.
7.4.1 Output Buffers
Each channel includes a separate output buffer which consists of a Darlington pair transistor that can drive up to
20mA.
10
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Product Folder Links: LM13700


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