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M377: Difference between revisions
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Each output has a its own control pins for: | Each output has a its own control pins for: | ||
* Output invert | * Output invert | ||
* Output enable | * Output enable. When an output is disabled, it has no offset and maintains the specified termination impedance. That is, the internal parallel output termination remains connected, but the signal current is shut off. The self-calibration of 11k systems makes use of this property. | ||
* High-frequency adjustment. The HF ADJ pins have 2k ohms input resistance to ground. The nominally acceptable inputs are ±1V to ground. Because the input resistance tracks the nichrome standard resistors inside the chip, the input is actually current sensitive, not that it makes much difference. This current affects the standing current in a feedback amplifier and hence its open loop gain. At low frequencies, the gain of the M377 is determined entirely by resistor values. At high frequencies, there is phase shift and changing the open loop gain will also change the closed loop gain, hence the transient response. | * High-frequency adjustment. The HF ADJ pins have 2k ohms input resistance to ground. The nominally acceptable inputs are ±1V to ground. Because the input resistance tracks the nichrome standard resistors inside the chip, the input is actually current sensitive, not that it makes much difference. This current affects the standing current in a feedback amplifier and hence its open loop gain. At low frequencies, the gain of the M377 is determined entirely by resistor values. At high frequencies, there is phase shift and changing the open loop gain will also change the closed loop gain, hence the transient response. | ||
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==165-2089-xx Pinout== | ==165-2089-xx Pinout== | ||
In the 11A32, | In the 11A32, output 1 is AUX SIG (aka AUX TRIGGER), output 2 is TRIGGER, and output 3 is DISPLAY. | ||
{| class="wikitable" | {| class="wikitable" | ||