TDAB
About the TDAB PCB
TDAB is an open source NXP PCB design by iowlabs, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 120 × 120 mm, with 587 components from 56 distinct parts.
Its main chip is the Teensy4.1, from the NXP family. Other key parts include the AD8421, OPA2277, OPA277, AD5282 and AD8475xRMZ. By type, the board carries 292 capacitors, 184 resistors, 57 ICs, 24 connectors, 24 jumpers and 5 diodes.
From the project
Repositorio para el proyecto de electromiografo
This device developed is an acquisition board for reading biometric signals from the human body, such as an EEG or EMG.
The board is based on the ADS1299, a 24-bit low-noise analog-to-digital converter developed for applications working with biopotential signals. The board uses a Teensy 4.1 as a DSP microcontroller to perform the tasks of synchronization, parameter configuration, ADC reading, and communication with the host.
Main components on the TDAB
TDAB bill of materials (BOM)
587 components, 56 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | AD8421 | SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U24, U32, U40, U48 |
| 12 | OPA2277 | SOIC-8_3.9x4.9mm_P1.27mm | U3, U4, U11, U12, U25, U29, U33, U37 +4 |
| 6 | ~ | TSSOP-16_4.4x5mm_P0.65mm | U5, U6, U26, U34, U42, U50 |
| 6 | OPA277 | SOIC-8_3.9x4.9mm_P1.27mm | U7, U8, U27, U35, U43, U51 |
| 12 | AD5282 | TSSOP-16_4.4x5mm_P0.65mm | U9, U10, U13, U14, U28, U30, U36, U38 +4 |
| 6 | AD8475xRMZ | MSOP-10_3x3mm_P0.5mm | U15, U16, U31, U39, U47, U55 |
| 1 | AP2112K-3.3 | SOT-23-5 | U17 |
| 1 | Teensy4.1 | Teensy41 | U18 |
| 1 | ADS1299-4PAG | TQFP-64_10x10mm_P0.5mm | U19 |
| 1 | MEA1D | Miniature SIP 6p | U20 |
| 1 | TCA9548APWR | TSSOP-24_4.4x7.8mm_P0.65mm | U21 |
| 1 | TPS730 | SOT-23-5 | U22 |
| 1 | TPS72325DBV | SOT-23-5 | U23 |
| 2 | OPA376xxDBV | SOT-23-5 | U56, U57 |
| 6 | HDR-2x1 | JST-XH-2x1-2.5p-TH-V | J1, J2, J3, J9, J10, J11 |
| 2 | Conn_02x03_Counter_Clockwise | PinHeader_2x03_P2.54mm_Vertical | J4, J21 |
| 5 | HDR-4x1 | JST-XH-4x1-2.5P-TH-V | J7, J15, J17, J18, J23 |
| 1 | HDR-2x1 | Tb-2x1-5p-TH-V | J8 |
| 2 | ON OFF | PinHeader_1x02_P2.54mm_Vertical | J16, J25 |
| 1 | Conn_02x04_Counter_Clockwise | PinHeader_2x04_P2.54mm_Vertical | J22 |
Show 36 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | HDR-2x1 | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J26, J27, J28 |
| 3 | HDR-3x1 | PinHeader_1x03_P2.54mm_Vertical | J29, J30, J31 |
| 1 | ~ | PinHeader_1x02_P2.54mm_Vertical | J32 |
| 1 | FUSE | Fuse_1206_3216Metric | F2 |
| 24 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8 +16 |
| 5 | LED | LED_0603_1608Metric | D1, D2, D3, D4, D5 |
| 17 | 100p | C_0603_1608Metric | C1, C3, C4, C6, C108, C110, C150, C152 +9 |
| 8 | 1n | C_0603_1608Metric | C2, C5, C109, C151, C193, C235, C281, C284 |
| 105 | 100n | C_0603_1608Metric | C7, C12, C13, C14, C21, C25, C26, C27 +97 |
| 85 | 10u | C_0805_2012Metric | C8, C9, C10, C11, C15, C16, C17, C18 +77 |
| 24 | 100u | C_1206_3216Metric | C19, C20, C28, C33, C35, C36, C37, C38 +16 |
| 6 | 200p | C_0603_1608Metric | C55, C56, C135, C177, C219, C261 |
| 12 | 0.001u | C_0603_1608Metric | C62, C66, C67, C71, C141, C143, C183, C185 +4 |
| 14 | 0.1u | C_0603_1608Metric | C77, C78, C79, C80, C99, C100, C146, C147 +6 |
| 2 | 5u | CP_Elec_5x5.4 | C85, C89 |
| 1 | 10u | CP_Elec_5x5.4 | C87 |
| 7 | 1u | C_0805_2012Metric | C88, C90, C92, C277, C278, C291, C292 |
| 1 | 2.2u | CP_Elec_4x5.3 | C91 |
| 2 | 10u | CP_Elec_4x5.3 | C93, C101 |
| 1 | 100u | C_0805_2012Metric | C94 |
| 2 | 1u | CP_Elec_4x5.3 | C95, C98 |
| 1 | 1.5n | C_0603_1608Metric | C103 |
| 2 | 10n | C_0603_1608Metric | C104, C105 |
| 2 | 2.2u | C_0805_2012Metric | C106, C107 |
| 16 | 10M | R_0603_1608Metric | R1, R2, R3, R4, R74, R75, R98, R99 +8 |
| 38 | 4.7k | R_0603_1608Metric | R5, R6, R7, R8, R9, R10, R59, R60 +30 |
| 24 | 160k | R_0603_1608Metric | R11, R12, R13, R16, R23, R24, R25, R26 +16 |
| 24 | 20k | R_0603_1608Metric | R14, R15, R17, R19, R39, R40, R41, R42 +16 |
| 33 | 10k | R_0603_1608Metric | R18, R20, R21, R22, R31, R32, R33, R34 +25 |
| 14 | 1k | R_0603_1608Metric | R27, R28, R29, R30, R87, R88, R111, R112 +6 |
| 12 | 3.3k | R_0603_1608Metric | R35, R36, R37, R38, R91, R92, R115, R116 +4 |
| 13 | 33 | R_0603_1608Metric | R43, R44, R45, R46, R57, R95, R96, R119 +5 |
| 2 | 636 | R_1206_3216Metric | R50, R54 |
| 1 | 318 | R_1206_3216Metric | R51 |
| 5 | 470 | R_0603_1608Metric | R55, R56, R170, R171, R183 |
| 2 | 1M | R_0603_1608Metric | R58, R61 |
TDAB design files
The KiCad project lives in the iowlabs/TDAB repository on GitHub; these links point at the commit this page was built from.
TDAB: common questions
What microcontroller does the TDAB use?
The TDAB is built around the Teensy4.1, from the NXP family.
How big is the TDAB PCB?
The TDAB measures 120 × 120 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the TDAB?
587 components, from 56 distinct parts. The full bill of materials is listed on this page.
Where can I download the TDAB design files?
From the iowlabs/TDAB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the TDAB design in my own project?
Yes, under the terms of its GPL-3.0 license, which iowlabs chose for the repository.
Can I test firmware for the TDAB without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.
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