PCB to enable the RP2040 Zero to be interfaced with various PLL evaluation boards
Page under construction!!
The 1st batch of prototype boards has arrived from JLCPCB. Testing is ongoing!
Tested OK with the MAX2870 and ADF4351 boards that share header config.
GPS headers Tested OK with 2 types of NEO-6M boards that I have
Lock Detect driver Tested OK with the MAX2870 and ADF4351.
.Onboard 3.3V regilator Tested OK with 130mA output. For thermal reasons this is the max reccomended as implemented. This can run the SV1AFN PLL board.
A single cut to a track and adding a series 500mA rated diode to the input of the 3.3V reg enables output of 240mA Max. This mod will be incorporated in later board releases
The PCB marshals SPI etc from the RP2040 Zero and is designed to plug directly onto several PLL evaluation board headers
Supports channel switching, Morse Key input, external GPS engine, optional true EEPROM for the RP2040
Supports several varieties of ADF4351 Evaluation board (including SV1AFN), MAX2870 and MAX2575 boards
Offers plugin support for some ADF5535 boards (Firmware not yet available)
Pads are provided for optional supply line decoupling, 3.3V rail segregation diode, lock detect indication (where presented) and an onboard 3.3V regulator if needed.
Additional optional components are 0805 size or bigger for ease of construction
-Video Video of ADF4351 test on 2m running JT4G
Documentation Provisional Setup instructions Issue 2
Mechanical support for type4 PLL board STL File for 3D printer
V1.1, the first production run of 100 has been ordered. All of this run are already allocated.
Delivery is expected by the end of April, however as I am on holiday shortly after, checks and processing of orders is likley to be late May.
Subject to sufficient demand another batch can be ordered.
The board schematic is little changed in most aspects. Layout has been ennhanced to allow easier use with yet more variants of the ADF4351 PLLs
The SV1AFN ADF4351 PLL board needs 3.3V fed to it and the onboard LDO regulator, which can be used for this, now has provision for an optional extra voltage dropper to improve its operation at high loads.
the choice of an ultra low noise regulator for this application is important
A seperate manual will be produced for the V1.1 board covering the extra facilities.
These boards will be available to buy soon
The cost of bare board will be £1.00 each
A short kit with the board, an SMD Schottky diode, 2 off 100nF 0805 caps and a 2x5 header for the PLL connection will be £1.50 each
UK postage, 10 bare boards or less £1.50... Boards with additional components £2.00. EU postage £3.30 to £3.75 depending on weight
Details of the V1.1 board below.
NOTE This is a work in progress. Component values etc. may change after evaluation of performance!.
Page under construction
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