# Acoustic 2.5 kHz Sensor - Analog Front-End (3.3V) ## Description 3.3 V acoustic sensor analog front-end using ZTS6216 MEMS microphone and TLV9062 gain/filter stages, tuned for 2.5 kHz response with ADC-ready output, test points, analog grounding, and manufacturable PCB rules. ## Project Details - **Owner:** chulumanco1 - **Created:** 3/16/2026 - **Last Updated:** 3/18/2026 - **Visibility:** Public - **Supply Notes:** Connect +12 V rail to net VCC and negative rail or return reference to GND as documented assumptions. For dual-supply operation, VCC- is tied to GND in this implementation and acts as the negative reference node. - **Output Node Label:** OUT - **Design Assumptions:** Defaulted to an active 2nd-order multiple-feedback bandpass filter because no numeric targets were supplied in the conversation. Chosen design target: 1 kHz center frequency, Q=5, 200 Hz bandwidth, 10k source and load impedance, 1 Vpp small-signal operation, dual supply +/-12 V, equal capacitors using C1=C2=10nF. Resistor targets derived for this topology are R1=15.9k, R2=159k, R3=31.8k. Use C0G/NP0 or film capacitors for stable response. - **Filter Order:** 2 - **Input Node Label:** IN - **Q Factor:** 5 - **Signal Amplitude:** 1 Vpp - **Source Impedance:** 10k - **Filter Type:** Active bandpass - **Topology:** Single op-amp multiple-feedback bandpass - **Load Impedance:** 10k - **System Architecture:** ```mermaid flowchart TD IN[Input signal] --> HP[High pass stage] HP --> BPF[Active bandpass filter] BPF --> OUT[Output signal] SPEC[Assumptions] --> BPF ``` - **Bandwidth:** 200 Hz - **Center Frequency:** 1 kHz ## Key Components ### MIC1 — [ZTS6216](https://www.flux.ai/lcsc/zts6216.md) - Product Info Url: https://lcsc.com/product-detail/New-Arrivals_ZILLTEK-ZTS6216_C481302.html - Manufacturer Part Number: ZTS6216 - Package: MIC-SMD_4P-L2.8-W1.9-P1.84-TL - JLCPCB Part Class: Extended Part - Role: Microphone - Package or Case Code: MIC-SMD_4P-L2.8-W1.9-P1.84-TL - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2003161906_ZILLTEK-ZTS6216_C481302.pdf - LCSC Part Number: C481302 - Part Type: MEMS Microphones - Manufacturer Name: ZILLTEK(钰太) - Role Details: Analog MEMS microphone for 2.5 kHz acoustic detection **Pins:** - GND [pin 3] - GND [pin 2] - OUT [pin 1] - VDD [pin 4] ### TP1 — [5019](https://www.flux.ai/lcsc/5019.md) - Package: CONN-SMD_5019 - JLCPCB Part Class: Extended Part - Package or Case Code: CONN-SMD_5019 - Role: Test Point - Role Details: Probe access for mic output, bias, gain stage, filter output, ADC output, and supply rail - LCSC Part Number: C238131 - Part Type: Test Points/Test Rings - Product Info Url: https://lcsc.com/product-detail/Test-Points-Test-Rings_Keystone_5019_Keystone-5019_C238131.html - Manufacturer Part Number: 5019 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2412030922_Keystone-5019_C238131.pdf - Manufacturer Name: Keystone **Pins:** - 1 [pin 1] ### TP2 — [5019](https://www.flux.ai/lcsc/5019.md) - Role: Test Point - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2412030922_Keystone-5019_C238131.pdf - Manufacturer Name: Keystone - Manufacturer Part Number: 5019 - Package: CONN-SMD_5019 - JLCPCB Part Class: Extended Part - Role Details: Probe access for mic output, bias, gain stage, filter output, ADC output, and supply rail - Part Type: Test Points/Test Rings - LCSC Part Number: C238131 - Product Info Url: https://lcsc.com/product-detail/Test-Points-Test-Rings_Keystone_5019_Keystone-5019_C238131.html - Package or Case Code: CONN-SMD_5019 **Pins:** - 1 [pin 1] ### TP3 — [5019](https://www.flux.ai/lcsc/5019.md) - Package: CONN-SMD_5019 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2412030922_Keystone-5019_C238131.pdf - Manufacturer Name: Keystone - Manufacturer Part Number: 5019 - Role: Test Point - JLCPCB Part Class: Extended Part - Role Details: Probe access for mic output, bias, gain stage, filter output, ADC output, and supply rail - Product Info Url: https://lcsc.com/product-detail/Test-Points-Test-Rings_Keystone_5019_Keystone-5019_C238131.html - Part Type: Test Points/Test Rings - LCSC Part Number: C238131 - Package or Case Code: CONN-SMD_5019 **Pins:** - 1 [pin 1] ### TP4 — [5019](https://www.flux.ai/lcsc/5019.md) - Manufacturer Name: Keystone - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2412030922_Keystone-5019_C238131.pdf - Package: CONN-SMD_5019 - Role: Test Point - Manufacturer Part Number: 5019 - Role Details: Probe access for mic output, bias, gain stage, filter output, ADC output, and supply rail - LCSC Part Number: C238131 - Part Type: Test Points/Test Rings - Product Info Url: https://lcsc.com/product-detail/Test-Points-Test-Rings_Keystone_5019_Keystone-5019_C238131.html - Package or Case Code: CONN-SMD_5019 - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] ### TP5 — [5019](https://www.flux.ai/lcsc/5019.md) - LCSC Part Number: C238131 - Part Type: Test Points/Test Rings - Product Info Url: https://lcsc.com/product-detail/Test-Points-Test-Rings_Keystone_5019_Keystone-5019_C238131.html - Package or Case Code: CONN-SMD_5019 - JLCPCB Part Class: Extended Part - Manufacturer Name: Keystone - Role: Test Point - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2412030922_Keystone-5019_C238131.pdf - Manufacturer Part Number: 5019 - Role Details: Probe access for mic output, bias, gain stage, filter output, ADC output, and supply rail - Package: CONN-SMD_5019 **Pins:** - 1 [pin 1] ### TP6 — [5019](https://www.flux.ai/lcsc/5019.md) - Package: CONN-SMD_5019 - Role Details: Probe access for mic output, bias, gain stage, filter output, ADC output, and supply rail - Manufacturer Name: Keystone - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2412030922_Keystone-5019_C238131.pdf - Manufacturer Part Number: 5019 - Role: Test Point - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Test-Points-Test-Rings_Keystone_5019_Keystone-5019_C238131.html - Part Type: Test Points/Test Rings - LCSC Part Number: C238131 - Package or Case Code: CONN-SMD_5019 **Pins:** - 1 [pin 1] ### U1 — [NE5534P](https://www.flux.ai/jecstronic/ne5534p.md) - Frequency: 1 kHz - License: https://creativecommons.org/licenses/by/4.0/ - Package: PDIP-8 - Datasheet URL: https://www.ti.com/lit/ds/symlink/ne5534a.pdf - Manufacturer Name: Texas Instruments - Role: Active Filter - Operating Voltage: +/-12 V - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: NE5534P - Role Details: Single-op-amp multiple-feedback bandpass core for 1 kHz center frequency, Q 5, bandwidth 200 Hz **Pins:** - BALANCE [pin 1] - COMP [pin 5] - COMP/BAL [pin 8] - IN- [pin 2] - IN+ [pin 3] - OUT [pin 6] - VCC- [pin 4] - VCC+ [pin 7] ### U1 — [TLV9062IDGKT](https://www.flux.ai/lcsc/tlv9062idgkt.md) - Role: Operational Amplifier - Package: VSSOP-8_L3.0-W3.0-P0.65-LS4.9-BL - Manufacturer Part Number: TLV9062IDGKT - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - Package or Case Code: VSSOP-8_L3.0-W3.0-P0.65-LS4.9-BL - LCSC Part Number: C2057512 - Role Details: Dual rail-to-rail op amp for microphone preamp and active filter/gain stages **Pins:** - 1 [pin 1] - 1 [pin OUT1] - 7 [pin OUT2] - 8 [pin V+] - IN1- [pin 2] - IN1+ [pin 3] - IN2- [pin 6] - IN2+ [pin 5] - V- [pin 4] ### U2 — [TLV9062IDGKT](https://www.flux.ai/lcsc/tlv9062idgkt.md) - LCSC Part Number: C2057512 - Role Details: Dual rail-to-rail op amp for microphone preamp and active filter/gain stages - Manufacturer Name: TI(德州仪器) - Package or Case Code: VSSOP-8_L3.0-W3.0-P0.65-LS4.9-BL - JLCPCB Part Class: Extended Part - Role: Operational Amplifier - Manufacturer Part Number: TLV9062IDGKT - Package: VSSOP-8_L3.0-W3.0-P0.65-LS4.9-BL **Pins:** - 1 [pin 1] - 1 [pin OUT1] - 7 [pin OUT2] - 8 [pin V+] - IN1- [pin 2] - IN1+ [pin 3] - IN2- [pin 6] - IN2+ [pin 5] - V- [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/chulumanco1/acoustic-2p5-khz-sensor-analog-front-end-3p3v](https://www.flux.ai/chulumanco1/acoustic-2p5-khz-sensor-analog-front-end-3p3v).* --- *Generated from [https://www.flux.ai/chulumanco1/acoustic-2p5-khz-sensor-analog-front-end-3p3v](https://www.flux.ai/chulumanco1/acoustic-2p5-khz-sensor-analog-front-end-3p3v)*