A few MC1458 occur oscillation and ADC at output side become stop.
I want to judge the reason is circuit problem with variation spec on MC1458, or defect.
TIJ CQE requested that request schematic review to E2E.
Would you check and advice about the reason below?
【Schematic】
Excerpted schematic is attached below, MC1458 are using 4pcs and all input and output are the same external components.
【Problem】
Waveforms are attached below, oscillation occur into -1V～-2V.
（ch1: input ±4V, ch2: output）
When NG parts, oscillation occur also all output channels.
※Normal case
・Additional information
When negative current exceed 1.7A, NG parts occur ripple. (60μs period)
（ch1: output, ch2: current, ch3: input）
→Vcc+, Vcc-, input side, and 5V supply (to ADC) are not find ripple.
→When OK parts replaced from NG parts, ripple was improved. (OK ⇒ NG is occur ripple)
If there need detailed information, please contact offline or directly e-mail.
Best regards,
Satoshi
