SparkFun_GNSSDO
sparkfun
The SparkFun GNSS Disciplined Oscillator (GNSSDO / GNSSDO+) is a precision time and frequency reference based on the Septentrio mosaic-T GNSS receiver. It features a disciplined 10MHz TCXO / OCXO oscillator, aluminum enclosure, Ethernet, PTP broadcast, data logging, multiple power options, and supports the Fugro AtomiChron timing service.
Components (68)
| Reference | Value | Description |
|---|---|---|
| Q1 | MBT3904DW1 | 100mA IC, 65V Vce, Dual NPN/NPN Transistors, SOT-363 |
| Q2-Q9 | DMG2305UX | P-MOSFET transistor, drain/gate/source |
| U1 | ESP32-WROVER-IE-N16R8 | |
| U2 | mosaic-T | Tri-band GNSS receiver |
| U3 | CH340C | USB serial converter, UART, SOIC-16 |
| U4 | KSZ8041NL/I | The KSZ8041NL is a single supply 10BASE-T/100BASE-TX physical layer transceiver, which provides MII/RMII interfaces to transmit and receive data. |
| U5,U11 | AP7361C-3.3V | 1A low dropout linear regulator, with enable pin, 2.2-6.0V input, 3.3V output, UDFN-8 |
| U6 | REC15E-2405SZ | The REC15E-Z series are 4:1 wide input voltage range 15W power DC/DC converters in a 1”x1” case. Despite their low cost, the converters are fully specified devices with output currents up to 4 Amps,no minimum load, 1.6kVDC isolation, high efficiency and low ripple/noise figures. |
| U7 | DP5305 | Power Over Ethernet PD Module (SIL), conforming to the IEEE 802.3af/at PoE standard. |
| U8-U10,U12,U14 | 74LVC2T45DC | Dual supply translating transceiver, 3-state, 2-bit, VSSOP-8 |
| U13 | STP3593LF | The STP3593LF is a precision double-oven OCXO offering ±0.05 ppb stability from -32°C to 70°C. |
| U15 | SN74LVC1G175DCK | Single D-Type Flip-Flop With Asynchronous Clear, 1.65V to 5.5V, SOT-363 (SC70) |
| U16 | JPS-3-1+ | Power splitter / combiner 3-Way 50Ohm 5 to 300MHz |
| U17,U20,U23,U24 | LMV7219M5 | Single Low-Power High-Speed Push-Pull Output Comparator, SOT-23-5 |
| U18 | MS8607-02BA | The MS8607 is a low power digital sensor providing 3 environmental physical measurements all-in-one: pressure, humidity and temperature (PHT). |
| U19 | PCA9306 | Dual bidirectional I2C Bus and SMBus voltage level translator |
| U25 | AP2112K-3.3 | 600mA low dropout linear regulator, with enable pin, 3.8V-6V input voltage range, 3.3V fixed positive output, SOT-23-5 |
| U26,U27 | LTC4418 | Prioritized PowerPath Controller |
| C1,C25,C27,C30,C33,C34,C37,C38,C47,C53 | 10uF | Unpolarized capacitor |
| C2,C3,C5,C10-C12,C14,C17,C19,C23,C26,C28,C40,C42,C44,C46,C48,C50,C55,C57,C60,C62,C63,C68-C70,C74,C79,C81,C85,C86,C92,C93,C95-C98,C101,C102,C104,C105 | 0.1uF | Unpolarized capacitor |
| C4,C13,C16,C18,C24,C31,C39,C41,C43,C45,C54,C56,C59,C61,C71-C73,C80,C84 | 2.2uF | Unpolarized capacitor |
| C6,C32,C36,C65 | 100uF | Polarized capacitor, US symbol, 0.248" Dia x 0.303" H, Electrolitic |
| C7,C8,C20-C22,C58,C77,C89,C90 | 1.0uF | Unpolarized capacitor |
| C9,C51,C64,C66,C67,C75,C76,C82,C87,C88 | 1.0nF | Unpolarized capacitor |
| C15 | 100pF | Unpolarized capacitor |
| C29 | 22uF | Unpolarized capacitor |
| C35 | 47uF | Polarized capacitor, US symbol, 0.248" Dia x 0.303" H, Electrolitic |
| C83 | 33pF | Unpolarized capacitor |
| C94,C103 | 10nF | Unpolarized capacitor |
| C99,C100 | 4.7uF | Unpolarized capacitor |
| D1,D15-D17 | PESD0402 | Bidirectional transient-voltage-suppression diode |
| D2,D3,D6 | DT1042-04SO | Very low capacitance ESD protection diode, 4 data-line, SOT-23-6 |
| D4,D5,D9,D10 | BAT60A | Schottky diode |
| D7,D13,D14 | DF5A5.6LFU | Low capacitance microSD unidirectional quadruple ESD protection diode array, 3.3V, Common Anode, SOT-353 |
| D8 | SK34A | Schottky diode |
| D11,D12 | CBI_LED_3mm_YGR | Triple CBI LED, 3mm dia., PTH, Yellow-Green-Red |
| F1,F2 | 6V/2.0A/4.0A | Resettable fuse 2A |
| FID1-FID4 | Fiducial_0.5mm | Fiducial Marker |
| G2 | LOGO | |
| J1,J3,J8,J10 | SMA_Edge | Not for new designs. Use 8mm variant. SMA PCB Edge Mount connector |
| J2,J4 | USB_C_Receptacle | USB 2.0-only Type-C Receptacle connector |
| J5 | MagJack_PoE | Ethernet RJ45 with magnetics and Power-over-Ethernet |
| J6 | microSD | Micro SD socket External Pin |
| J7 | Qwiic_Vertical | 4 pin JST 1mm polarized connector for I2C |
| J9 | Screw_Cage_3.5mm-10 | Screw cage terminal, single row |
| JP2-JP6,JP14 | Measure | Solder Jumper, 2-pole, closed/bridged |
| L1,L2 | 470 Ohm | Inductor |
| L3,L4 | 6.8uH | Inductor |
| R1-R3,R5,R11,R23,R24,R27-R29 | 10k | Resistor |
| R4,R6,R8,R31,R32,R60,R62 | 2.2k | Resistor |
| R7,R17,R18,R37,R45,R53,R56,R57,R61,R64,R66,R67,R77,R78 | 1k | Resistor |
| R9,R10,R14,R15 | 5.1k | Resistor |
| R12,R13,R38-R40,R42 | 470 | Resistor |
| R16,R41,R43,R44,R52,R68,R75 | 100k | Resistor |
| R19-R22,R36,R47,R50,R51,R59 | 49.9 | Resistor |
| R25,R26 | 13k | Resistor |
| R30,R48,R54,R55,R58,R65,R69-R74,R79 | 0 | Resistor |
| R33-R35 | 4.7k | Resistor |
| R46,R63,R81,R84,R87 | 200k | Resistor |
| R49,R80,R82,R83,R85,R86,R88,R89 | 47k | Resistor |
| R76 | 33 | Resistor |
| R92-R97 | 100 | Resistor |
| ST1-ST4 | Standoff | Drill holes for mechanically mounting via screws, standoffs, etc. |
| SW1-SW3 | PTH_RA_h7.5mm | Single Pole Single Throw (SPST) switch |
| SW4 | DPDT_Slide_SMD_7.2x3.5mm | Switch dual pole double throw |
| TP1-TP19,TP21-TP29,TP33-TP41,TP43 | PTH | Test Point |
| TP20,TP30-TP32,TP42,TP44-TP48 | 1.25mm | Test Point |
| TR1 | RFCMF1220100M4T | USB Transformer |