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2 layersADS1271 pcb, the printed circuit board in 3D

Para la entrada diferencial, el fabricante recomienda dos configuraciones dependiendo el modo en el que se quiera utilizar el ADC.

Copper layers
2
Thickness
1.6 mm
Parts
21
Nets
19
Pads
63
Tracks, vias
116, 0
Pours
2
Routed
Yes
KiCad
KiCad 4
Created
3 Jun 2018
Updated
27 Feb 2019

Overview

ADS1271 pcb is an open-source printed circuit board by LMproyects, from the LMproyects/PCB_ADS1271 repository on GitHub. It is a 2-layer board with 21 parts on 19 nets, routed with 116 tracks and 0 vias.

It is built around the ADS1271IPW and LM336Z-2.5/T7. Its parts include 8 capacitors, 6 resistors, 3 ICs and 3 connectors.

Main components

2

README

README.md

Diseño PCB de prueba para ADS1271

Diseñadores

  • Luciano Villarreal
  • Marcos Postemsky

Elección de pines

Modo de operación

Vamos a trabajar con comunicación SPI, adquiriendo datos de forma continua (SYNC-PDWN='1')

Pines a PinMod

Para trabajar con SPI

  • CLK: reloj continuo que utiliza el ADC para muestreo y conversión.
  • SCLK: Reloj utilizado para la comunicación SPI.
  • DOUT: Datos de salida SPI.
  • DRDY: Una vez que los datos válidos están listos, DRDY se pone en bajo.

Pines ADS1271 fijos

  • SYNC/PDWN: Se mantiene este valor en alto, para poder trabajar con adquisición de datos de manera continua.

Componentes necesarios

  • 1 ADS1271: ADC de 24 bits Delta&Sigma con entrada y referencia diferencial.
  • 6 pines con curva de 90º.
  • 1 LM7805
  • 1 Capacitor electrolítico 0.33 uF, 25V.
  • 2 Capacitores electrolítico 0.1 uF
  • 2 Capacitores electrolítico 10 uF
  • 2 Capacitores cerámica 100 pF
  • 1 Capacitores cerámica 1 nF
  • 5 Resistencias de 50 Ohmios
  • 1 Resistencia de 680 Ohmios
  • 1 LM336z2.5 (se puede cambiar por zener de 2.5 v)
  • 2 pines 2.54 mm
  • 2 pines 2.54 mm

Diseño del esquematico

Para el diseño del esquemático que será utilizado en el PCB de prueba, se tiene en cuenta el circuito recomendado por el fabricante Texas Instruments. A continuación, puede verse el circuito mencionado.

Imagen_circuito

Circuitos de entrada

Para la entrada diferencial, el fabricante recomienda dos configuraciones dependiendo el modo en el que se quiera utilizar el ADC.

Imagen_circuito_entrada_diferencial

Parts

21
QtyValueFootprintReferences
550Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_VerticalR2, R3, R4, R5, R6
210 ufCapacitors_THT:CP_Radial_D5.0mm_P2.50mmC6, C7
2100pFCapacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mmC3, C4
10,1 ufCapacitors_THT:CP_Radial_D5.0mm_P2.50mmC2
10.1 uFCapacitors_THT:CP_Radial_D5.0mm_P2.50mmC8
10.33 ufCapacitors_THT:CP_Radial_D5.0mm_P2.50mmC1
11nFCapacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mmC5
1680Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_VerticalR1
1ADS1271Housings_SSOP:TSSOP-16_4.4x5mm_Pitch0.65mmU3
1CONN_01X02_ent_difConnectors_Molex:Molex_SPOX-5267_22-03-5025_02x2.54mm_StraightJ2
1Conn_01x06_Male_fpga_pinsConnectors_Molex:Molex_SPOX-5267_22-03-5065_06x2.54mm_StraightJ3
1Jumper_NC_Dual_selec_modoConnectors_Molex:Molex_SPOX-5267_22-03-5035_03x2.54mm_StraightJP1
1LM336z2.5TO_SOT_Packages_THT:TO-92_Inline_Narrow_OvalU2
1LM7805_usTO_SOT_Packages_THT:TO-220-3_VerticalU1
1conector +7VConnectors_Molex:Molex_SPOX-5267_22-03-5025_02x2.54mm_StraightJ1

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Questions

What parts does the ADS1271 pcb use?

21 parts, built around the ADS1271IPW and LM336Z-2.5/T7. 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 ADS1271 pcb KiCad files?

From the LMproyects/PCB_ADS1271 repository on GitHub, at the commit this page was made from: the board is ADS1271_pcb/ADS1271_pcb.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the ADS1271 pcb design in my own project?

Its repository states no licence, so its author keeps all rights: ask LMproyects before reusing the design.