# AD5933 Impedance Measurement Board ## Description General-purpose AD5933 impedance analyzer with protected external 5 V input, regulated 3.3 V rail, host I2C interface, selectable 10 kΩ/100 kΩ/1 MΩ feedback ranges, and DUT connection for measurements up to 100 kHz. ## Project Details - **Owner:** cooolguy1 - **Created:** 8/9/2026 - **Last Updated:** 8/10/2026 - **Visibility:** Public - **Implementation Details:** AD5933; 1kΩ–10MΩ target; 100kHz max - **Operating Voltage:** 5V - **Connectivity:** I2C - **Domain:** Test & Measurement ## Key Components ### D1 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Role Details: Series Schottky reverse-polarity protection on 5 V input - Functional Group: Power Input and Regulation - Manufacturer Name: Slkor(SLKORMICRO Elec.) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Role: Reverse Polarity Protection - Manufacturer Part Number: SS14 - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf **Pins:** - Anode [pin A] - Cathode [pin C] ### D2 — [SMAJ5.0A](https://www.flux.ai/lcsc/smaj5p0a~hhs.md) - Forward Voltage: 1.0V to 1.3V - LCSC Part Number: C499811 - Manufacturer Name: SHIKUES(时科) - Max Reverse Voltage: 7V - Functional Group: Power Input and Regulation - Package or Case Code: SMA_L4.4-W2.6-LS5.0-R-RD - Manufacturer Part Number: SMAJ5.0A - Product Info Url: https://lcsc.com/product-detail/TVS_Shikues-SMAJ5-0A_C499811.html - Role: Protection - Role Details: 5 V TVS shunt from VIN_5V to GND; never series - Diode Type: TVS Diode - JLCPCB Part Class: Extended Part - Part Type: TVS - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Shikues-SMAJ5-0A_C499811.pdf **Pins:** - A [pin 1] - K [pin 2] ### F1 — [1206L020YR](https://www.flux.ai/adrian95/1206l020yr~xmv.md) - Part Type: Fuse - Role: Protection - Datasheet URL: https://www.littelfuse.com/media?resourcetype=datasheets&itemid=2b6a1515-d4ee-4c83-8bd4-152b4901b8f5&filename=littelfuse_ptc_1206l_datasheet.pdf - Manufacturer Part Number: 1206L020YR - Manufacturer Name: Littelfuse Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 200 mA hold PTC; >6× margin over 30 mA design allowance - Functional Group: Power Input and Regulation **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [TSW-104-07-G-S](https://www.flux.ai/adrian95/tsw-104-07-g-s~983.md) - Datasheet URL: http://suddendocs.samtec.com/prints/tsw-xxx-xx-xxx-x-xx-xxx-mkt.pdf - Part Type: Connector - Role: Host Connector - Manufacturer Part Number: TSW-104-07-G-S - Functional Group: Host Interface - Role Details: Pin 1 5V, pin 2 GND, pin 3 SDA, pin 4 SCL; I2C logic domain is 3.3 V - Package or Case Code: TSW10407GS - Manufacturer Name: Samtec Inc. - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J2 — [KF128-5.08-2P-AA](https://www.flux.ai/lcsc/kf128-5p08-2p-aa~0pbi.md) - Connector Gender: Female - Operating Temperature: -40℃~+105℃ - Manufacturer Name: KEFA(科发) - Manufacturer Part Number: KF128-5.08-2P-AA - Role: DUT Connector - Current Rating: 24A - JLCPCB Part Class: Extended Part - LCSC Part Number: C474952 - Part Type: Screw terminal - Package or Case Code: CONN-TH_P5.08_KF128-5.08-2P - Connector Rows: 1 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2408211511_Cixi-Kefa-Elec-KF128-5-08-2P-AA_C474952.pdf - Product Info Url: https://lcsc.com/product-detail/New-Quadratic-Unclassified-Data_Cixi-Kefa-Elec-KF128-5-08-2P_C474952.html - Connector Positions: 2 - Functional Group: Analog Front End - Role Details: Pin 1 AD5933 excitation VOUT; pin 2 receive VIN_SENSE - Connector Type: Screw terminal - Connector Pitch: 5.08mm **Pins:** - 1 [pin 1] - 2 [pin 2] ### LED1 — [SM0805HCL](https://www.flux.ai/adrian95/sm0805hcl~2dj.md) - Manufacturer Part Number: SM0805HCL - Functional Group: Power Indicator - Manufacturer Name: Bivar Inc. - Role: Current Limiting - Datasheet URL: https://www.bivar.com/parts_content/Datasheets/SM0805HCL.pdf - Part Type: LED - Role Details: Red power LED at approximately 0.7 mA with 2 kΩ series resistor - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### RFB1 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Tolerance: 0.1% - Package: SMD_0805_2012Metric - Resistance: 10kΩ - Power Rating: 0.125W - Part Type: Resistor - Role Details: Selectable AD5933 transimpedance feedback; calibrate after selecting range - Role: Feedback - Functional Group: Range Selection **Pins:** - P1 [pin 1] - P2 [pin 2] ### RFB2 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Role Details: Selectable AD5933 transimpedance feedback; calibrate after selecting range - Tolerance: 0.1% - Functional Group: Range Selection - Package: SMD_0805_2012Metric - Role: Feedback - Resistance: 100kΩ - Part Type: Resistor - Power Rating: 0.125W **Pins:** - P1 [pin 1] - P2 [pin 2] ### RFB3 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Functional Group: Range Selection - Role Details: Selectable AD5933 transimpedance feedback; leakage-sensitive high-impedance range - Power Rating: 0.125W - Part Type: Resistor - Tolerance: 0.1% - Package: SMD_0805_2012Metric - Resistance: 1MΩ - Role: Feedback **Pins:** - P1 [pin 1] - P2 [pin 2] ### TP1 — [5002](https://www.flux.ai/cherepanyadima/5002~l4.md) - Manufacturer Part Number: 5002 - Part Type: Connector - Role: Test Point - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p62.pdf - Functional Group: Test Access - Manufacturer Name: Keystone - Role Details: AD5933 excitation output VOUT **Pins:** - ~ [pin TP] ### TP2 — [5002](https://www.flux.ai/cherepanyadima/5002~l4.md) - Role Details: Sensitive AD5933 VIN_SENSE node - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p62.pdf - Manufacturer Name: Keystone - Role: Test Point - Part Type: Connector - Manufacturer Part Number: 5002 - Functional Group: Test Access **Pins:** - ~ [pin TP] ### TP3 — [5002](https://www.flux.ai/cherepanyadima/5002~l4.md) - Manufacturer Name: Keystone - Role: Test Point - Functional Group: Test Access - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p62.pdf - Role Details: Regulated +3V3 rail - Manufacturer Part Number: 5002 - Part Type: Connector **Pins:** - ~ [pin TP] ### TP4 — [5002](https://www.flux.ai/cherepanyadima/5002~l4.md) - Functional Group: Test Access - Manufacturer Part Number: 5002 - Part Type: Connector - Manufacturer Name: Keystone - Role: Test Point - Role Details: Ground probe reference - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p62.pdf **Pins:** - ~ [pin TP] ### U1 — [AD5933YRSZ](https://www.flux.ai/lcsc/ad5933yrsz~0lwd.md) - Role Details: 100 kHz max, internal clock, 1 kΩ–10 MΩ target with selectable feedback - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5933.pdf - JLCPCB Part Class: Extended Part - LCSC Part Number: C578324 - Manufacturer Part Number: AD5933YRSZ - Symbol Style: parametric-v1 - Functional Group: AD5933 Core - Role: Signal Generation - Package or Case Code: SSOP-16_L6.2-W5.3-P0.65-LS7.8-BL - Part Type: Direct Digital Synthesis (DDS) - Manufacturer Name: ADI(亚德诺) **Pins:** - AGND1 [pin 13] - AGND2 [pin 14] - AVDD1 [pin 10] - AVDD2 [pin 11] - DGND [pin 12] - DVDD [pin 9] - MCLK [pin 8] - NC [pin 7] - NC [pin 3] - NC [pin 2] - NC [pin 1] - RFB [pin 4] - SCL [pin 16] - SDA [pin 15] - VIN [pin 5] - VOUT [pin 6] ### U2 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Power Conversion - Role Details: 30 mA design allowance; estimated 0.051 W dissipation; 600 mA-rated fixed 3.3 V LDO - Manufacturer Part Number: AP2112K-3.3TRG1 - Part Type: Integrated Circuit - Functional Group: Power Input and Regulation - Symbol Style: parametric-v1 **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/cooolguy1/ad5933-impedance-measurement-board~8g](https://www.flux.ai/cooolguy1/ad5933-impedance-measurement-board~8g).* --- *Generated from [https://www.flux.ai/cooolguy1/ad5933-impedance-measurement-board~8g](https://www.flux.ai/cooolguy1/ad5933-impedance-measurement-board~8g)*