Update HVAMP32 according to the factual specs #155

esavkin · 2024-10-10T16:50:35+08:00

esavkin commented

2024-10-10 16:50:35 +08:00

@morgan noticed that specs were updated

esavkin added 1 commit 2024-10-10 16:50:35 +08:00

893459396c Update HVAMP32 according to the factual specs

Signed-off-by: Egor Savkin <es@m-labs.hk>

morgan commented

2024-10-10 17:03:13 +08:00

P.S. While OPA462 has the same pinout as LTC6090, they have different GBW and slew rate. Also the schematic didn't include OPA462 as an alternative.

LTC6090
- GBW: 12 MHz
- Slew rate: 21 V/µs
OPA462
- GBW: 6.5 MHz
- Slew rate: 25 V/µs

P.S. While OPA462 has the same pinout as LTC6090, they have different GBW and slew rate. Also the schematic didn't include OPA462 as an alternative. - LTC6090 - GBW: 12 MHz - Slew rate: 21 V/µs - OPA462 - GBW: 6.5 MHz - Slew rate: 25 V/µs

sb10q reviewed 2024-10-10 22:14:36 +08:00

static/js/shop_data.js Outdated

						
				@ -880,2 +880,2 @@

				        'Amplifier: LTC6090 or OPA462, 32 channels.',

				        'Amplification range up to ±25V and ±55V available.',

				        'Amplifier: LTC6090, 32 channels.',

				        'Amplification range up to ±50V and ±55V available.',

sb10q commented

2024-10-10 22:14:36 +08:00

Are there really 50V and 55V variants? @morgan

morgan commented

2024-10-14 10:05:06 +08:00

Yes, from the latest release of HVAMP_32 v1.02rc there are 50V and 55V variant schematics. And the difference between them are the OP amp gain circuit (5x -> 5.5x gain) and the LDO resistive divider (HVout = ±56V -> ±57V).

Yes, from the latest release of HVAMP_32 [v1.02rc](https://github.com/sinara-hw/HVAMP_32/releases/tag/v1.02rc1) there are 50V and 55V variant schematics. And the difference between them are the OP amp gain circuit (5x -> 5.5x gain) and the LDO resistive divider (HVout = ±56V -> ±57V).

sb10q commented

2024-10-14 10:05:44 +08:00

That doesn't make a lot of sense, please check with Greg.

👍 1

morgan commented

2024-10-18 16:59:08 +08:00

Greg just replied, saying the latest v1.02 is a completely new design and the ±50V variant is indeed the standard variant. Also, they never produced the ±25V variant of v1.02. But he mentioned a way to convert existing v1.02 PCB to be ±25V variant.

""
For +/-25V you need to modify R1 to 30k*2.5
And R20/R35 to get +/- 28V supply
Also IC12/IC14 need to be removed and shorted by 0R resistors (R21,R25,R6,R8) because we would need +/-30V instead of+/- 60V
""

Greg just replied, saying the latest v1.02 is a completely new design and the ±50V variant is indeed the standard variant. Also, they never produced the ±25V variant of v1.02. But he mentioned a way to convert existing v1.02 PCB to be ±25V variant. "" For +/-25V you need to modify R1 to 30k*2.5 And R20/R35 to get +/- 28V supply Also IC12/IC14 need to be removed and shorted by 0R resistors (R21,R25,R6,R8) because we would need +/-30V instead of+/- 60V ""

sb10q commented

2024-10-18 17:26:13 +08:00

OK then let's just mention the +-50V variant only.

esavkin force-pushed master from 893459396c to 130b8b67d9

2024-10-24 17:25:50 +08:00

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Reference: M-Labs/web2019#155