2 layers151.3 × 50.8 mm
2 layers84 × 69.5 mm
Ref fixa v02
agaelema/Precision-Voltage-Reference7A simple and efficient instrumentation project of a Precision Voltage Reference. The idea of this project appeared with my passion by the instrumentation and my need of some reference to calibrate my projects involving…
- Size
- 84 × 69.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 69
- Nets
- 46
- Pads
- 168
- Tracks, vias
- 545, 15
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 6 Sep 2016
- Updated
- 6 Dec 2017
Overview
Ref fixa v02 is an open-source printed circuit board by agaelema, from the agaelema/Precision-Voltage-Reference repository on GitHub, published under the MIT licence. It is a 2-layer board of 84 × 69.5 mm with 69 parts on 46 nets, routed with 545 tracks and 15 vias.
It is built around the INA2133UA, LM358 and LM317AT, with the LM337T and REF102BP among its other parts. Its parts include 20 resistors, 6 ICs, 5 capacitors and 1 diode.
Main components
5
INA2133UA
SOIC-14-18V~-2.25V、2.25V~18V -40℃~+85℃ 1.5MHz 2 25mA 36V 4.5V~36V 450uV 5.5us 57nV/√Hz@1kHz 5V/us 5uV/℃ 90dB 950uA Capacitive load driving、Integrated precision resistor network SOIC-14 Differential Amplifiers ROHSTexas InstrumentsDifferential Amplifiers
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
LM317AT
TO-220-40℃~+125℃ 0.003%Vout 1 1.25V~37V 1.5A 40V 80dB@(120Hz) Adjustable Over Current Protection、Short Circuit Protection Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LM337T
TO-2200℃~+125℃@(Tj) 1 1.25V~37V 1.5A 40V 77dB@(120Hz) Adjustable Negative Over Current Protection、Short Circuit Protection、Thermal shutdown TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
REF102BP
PDIP-8-25℃~+85℃ 1.4mA 10V 10mA 11.4V~36V 2.5ppm/℃ 5uVp-p Fixed Series ±0.05% PDIP-8 Voltage Reference ROHSTexas InstrumentsVoltage Reference
README
README.mdPrecision Voltage Reference
A simple and efficient instrumentation project of a Precision Voltage Reference. The idea of this project appeared with my passion by the instrumentation and my need of some reference to calibrate my projects involving energy measurement.
Searching for similar projects I encountered some videos from the Youtube channel "Scullcom Hobby Electronics". This two videos was the kick for my project.
The project is based in the TI REF102, an 10 V precision voltage reference with maximum tolerance of 0,025% (0.0025 V) in the better model.
Other 4 outputs are derived from the 10 V output, making available 10 V, 5V, 2,50V, 1,125 V and 0,625 V. This values are obtained using the Precision Difference Amplifier INA2133
The original idea is to be a simple project with components easily found in the market.
The Supply
The project is powered by a common 5V power bank, and the output of the power bank is applied to a DC/DC step up to 20 V. With one LM317 and one LM337 we generates the positive supply for the REF102 and negative voltage to compensate some offset in the INAs.
The output is referenced to a Virtual ground, not the GND from the power bank.
The Outputs
Using the INA2133 is possible to implement a 1/2 divider with great precision. At the same time the outputs are buffered between the stages.
To compensate some possible input offset in the stages, was implements simple circuits to externally compensate the offset. This circuit inject some voltage in the Ref pin of the INA.
The ideia of divider:
The Result
The project was developed using Kicad. The complet schematic is presented bellow.
The assembled board.
The results without calibration (default value), calibrating just the REF102 output and calibrating each output individually.
Related Articles
There is a serie of 4 articles talking about this project.
- Article 1 (The idea)
- Article 2 (The power supply)
- Article 3 (The voltage reference)
- Article 4 (The results)
DISCLAIMER
This project is provided 'as is' with no explicit or implied warranties in respect of its properties, including, but not limited to, correctness and/or fitness for purpose.
Parts
69| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | CONN_01X01 | My_Edited:PINTST-2.4-1.0mm | 0.625V, 1.25V, 2.5V, 5V, 10V, Bat_in, VCC_reg-, VCC_reg+, Vgnd |
| 8 | 10 | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R9, R10, R12, R13, R17, R18, R19, R20 |
| 7 | JUMPER | My_Edited:Pin_Header_Straight_1x02-2,1-1,2mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7 |
| 5 | 1uF | My_Edited:C_Radial_D5_L6_P2.5-1.6mm | C_U4, C_U5, C_U6, C5, CF1 |
| 4 | 1.2k | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R11, R14, R15, R16 |
| 4 | 100k | My_Edited:Potentiometer-pinlinear-2.1-0.85mm | RV2, RV3, RV4, RV5 |
| 4 | 100nF | My_Edited:C_Disc_D3_P2.5-1.8-0.85mm | C2, C3, C4, CF3 |
| 4 | 10uF | My_Edited:C_Radial_D5_L6_P2.5-1.6mm | C_U2, C_U3, C1, CF2 |
| 4 | 1pin | Connect:1pin | , , , |
| 2 | 470 | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R4, R6 |
| 2 | INA2133UA | My_Edited:SOIC-14_N-0.75mm | U5, U6 |
| 1 | 100 | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R7 |
| 1 | 100k | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R3 |
| 1 | 100nF | Capacitors_ThroughHole:C_Rect_L4_W2.5_P2.5 | C6 |
| 1 | 10k | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R1 |
| 1 | 18V-22V | My_Edited:bornier2-edit | DC/DC_in |
| 1 | 1M | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R8 |
| 1 | 1N4148 | My_Edited:Diode_DO-35_SOD27_Horizontal_RM10-2.1mm | D1 |
| 1 | 20k | My_Edited:Potentiometer-pinlinear-2.1-0.85mm | RV1 |
| 1 | 22 | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | RF1 |
| 1 | 2k2 | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R2 |
| 1 | 3k9 | My_Edited:Resistor_Horizontal_RM10mm-2.3-0.85mm | R5 |
| 1 | JUMPER | Pin_Headers:Pin_Header_Straight_1x02 | JP8 |
| 1 | LM317AT | My_Edited:TO-220-3d | U2 |
| 1 | LM337T | My_Edited:TO-220-3d | U3 |
| 1 | LM358 | My_Edited:PDIP-8-3d-2.1-0.85mm | U1 |
| 1 | REF102BP | My_Edited:PDIP-8-3d-2.1-0.85mm | U4 |
Questions
How big is the Ref fixa v02 PCB?
It measures 84 × 69.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ref fixa v02 use?
69 parts, built around the INA2133UA, LM358, LM317AT and LM337T. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Ref fixa v02 KiCad files?
From the agaelema/Precision-Voltage-Reference repository on GitHub, at the commit this page was made from: the board is v02 - artigo/Ref_fixa_v02.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ref fixa v02 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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