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Part Number: LM98725
All signals toggle indefinitely except SH1. There is no "readout window" I can catch on the scope by triggering to SH1. Please help.
I lock the registers (start CCD readout), and watch SH1, PHIA1, PHIB1, CP, RS with scope (high-Z), not loaded at all.
When I toggle "SH1 active" register field on/off in unlocked state, the corresponding output changes DC value from 0 to 3.3V and vice versa.
This means, I look at the proper output. But it doesn't toggle during locked state.
Total current consumption: locked: 124mA, unlocked: 116mA
The registers I touch during configuration:
Signal outputs (5 MHz input clock):
My test circuit based on datasheet circuit:
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Analog Motor Drives
In reply to James Lockridge:
I used 1, 5 and 10 MHz clock input without major difference.
The plots are provided for 5 MHz clock.
I used no averaging on the signal. My scope has 50 MHz analog BW and freshly calibrated probes.
In reply to Rom Yaz:
The clock is configured as single ended:
Do you have any ideas or update for me?
I generated the clock with a 3.3V microcontroller.
If you've only written to those registers on page 0 and page 8, the CCD Timing outputs won't be providing useful clocking.
Please try loading the following register settings (followed by setting the register lock bit) to see if that changes the waveforms see on the outputs.
The file format doesn't include a Page number, but instead has all registers in series with each page being 1F registers long.
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