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Can the DC/DC architecture be simplified? Some ICs not in stock, see DC/DC converters
- Replace LMZ31530 (30A) with TPSM5D1806 in parallel mode (12A) since Vcc_int is estimated at 7A?
  - No, the 20A version should be available (LMZ31520)
- Replace LT1764 with LT3083 for simpler paralleling circuitry (see power graph)?
Are the ASIC digital supply (G_DS_X) and I/O supply (G_IO_X) shared among all four ASICs? Do we have the CML current consumption numbers?
- Gang is saying around 20mA (15mA + 30% LVT) per ASIC TX Transceiver (for all frequencies). ASIC RX consumption is negligible
- Update power estimation table with these numbers
Request components for Altium library (see Altium Missing Components section)
- Connectors have been requested on 2023-08-28
- Other ICs
- Transceiver
  - Compare with the layout done in PADS after to make sure it's correct orientation

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title	Archived questions

Route +6V or +24V between analog and digital board?
- If +6V: All first-stage converters (LT8648S) must be on one the board with the input TFM connector
- +24V between boards
For the 0.6V sink:
- Is it really +0.6V and sinking current that is needed?
- Has this been done before?
- Special LDO config needed? (see design note from Analog)
- Precision Current Sources and Sinks Using Voltage References
- Pietro has simulated and tested this with evaluation board
On which board does the power connector (TFM) go and which type (TFM-112, TFM-115, etc)? (update Connectors section)
- TFM-113-02-L-DH was used on the ePixHR250M_2x2_Camera
- Analog board
Use FPGA transceivers for clocking the ASICs?
- Yes
- One per ASIC?
  - Yes
  - I think one per ASIC is the best solution. Is there any reason why we should go for a clock splitter?
    - Probably no unless we run out of connector pins
Does the digital board need the analog ground (AGND)? (see 100kfps DAQ support system)
- Will have it anyway since the TFM power connector is on the digital board
What's the expected operating temperature range?
- -25C → +50C
Are the ASIC digital supply (G_DS_X) and I/O supply (G_IO_X) shared among all four ASICs?
- Yes

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ASIC level requirements summary

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Component	Product number	Quantity	Input Voltage	Output Voltage	Max Current	Comment
DC/DC Step Down converter	LT8648S	4	3V to 42V	0.6V to 42V	15A	For analog board first stage power
DC/DC Step Down converter	LT8638S	2	2.8V to 42V	0.6V to 42V	10A	Parallel operation For digital board first stage power (same as used in Power & communication board (PC_261_101_26_C00)
DC/DC PMIC	TPSM5D1806	7	4.5V to 15V	0.5V to 5.5V	Dual 6A / Single 12A
DC/DC Buck converter	LMZ31520	1	3V to 14.5V	0.6V to 3.6V	20A	30A version (LMZ31530) not in stock
Low Noise LDO	LT1764	8	2.7V to 20V	1.21V to 20V	3A	Low Output Noise: 40µVRMS (10Hz to 100kHz)
LDO alternative to LT1764	LT3083	8	1.2V to 23V	Adjustable to 0V	3A	Low Output Noise: 40μVRMS (10Hz to 100kHz)
Low Noise LDO	LT3086	12	1.4V to 40V	0.4V to 32V	2.1A	Low Output Noise: 40µVRMS (10Hz to 100kHz)
Negative Linear Regulator	LT3091	8	–1.5V to –36V	0V to –32V	-1.5A	Low Output Noise: 18µVRMS (10Hz to 100kHz)

TI webench

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