TC3402VQR - 16-Bit Sigma-Delta ADC, 4-Input | Microchip
Référence : TC3402VQR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.95 | $7,95 |
| 10 | $6.85 | $68,50 |
| 100 | $5.45 | $545,00 |
| 500 | $4.62 | $2 310,00 |
| 1 000 | $3.98 | $3 980,00 |
TC3402VQR Présentation
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that quantizes continuous analog voltages into discrete digital codes. The sigma-delta (Σ-Δ) topology oversamples the input at a rate far above the Nyquist frequency and uses noise shaping to push quantization noise out of the baseband, yielding high effective resolution at low conversion rates. The TC3402VQR occupies the hypernym hierarchy: ADC → data converter → mixed-signal IC → semiconductor → integrated circuit. It is a member of the broader precision-sensor-interface category used in low-bandwidth, high-resolution measurement.
Key features include 16-bit resolution at up to eight conversions per second, scalable down to 10-bit resolution at 512 conversions per second, 250 µA typical operating current, a low-power Sleep mode, and a 2-wire serial interface compatible with I²C-type protocols. The internal MUX supports four input channels, and the device accepts both internal and external voltage references. Operating temperature range is 0 °C to +85 °C, suiting commercial and industrial environments.
Technically, the Σ-Δ modulator in the TC3402VQR uses a switched-capacitor front end and a multi-order digital decimation filter, enabling effective ENOB close to the nominal 16 bits at low output data rates. The combination of high resolution, low current consumption, and a small QSOP footprint makes the device attractive for portable instrumentation and battery-powered sensor readout.
Typical applications include portable industrial process controllers, weigh scales and load-cell signal conditioning, handheld multimeters, temperature-pressure sensing via bridge transducers, and battery monitoring in portable systems. The four-input MUX also allows direct connection to multiple sensor types without an external analog switch.
Design consideration: bypass VDD with both a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin and a 1 µF tantalum or larger value bulk capacitor. Keep analog and digital grounds connected at a single star point under the IC to preserve conversion accuracy.
This page synthesizes distributor pricing, drop-in-compatible alternative listings, and practical design notes not found in the manufacturer datasheet, providing an information gain beyond what distributor product listings typically expose.
Alternatives de remplacement direct pour TC3402VQR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
TC3402VQ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TC3402VQRTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TC3402VQR Valeurs maximales et caractéristiques électriques
| Manufacturer | Microchip Technology |
| Part Number | TC3402VQR |
| Fonction | 16-bit, 4-input Sigma-Delta Analog-to-Digital Converter |
| Résolution | 16-bit (10-bit at higher throughput) |
| Number of Input Channels | 4 (multiplexed) |
| Conversion Rate | 8 conversions/s at 16-bit; up to 512 conversions/s at 10-bit |
| Tension d'alimentation | +1.8 V nominal (5.5 V tolerant inputs) |
| Supply Current (Active) | 250 µA typical |
| Data Interface | Serial (2-wire, I²C-compatible) |
| Tension de référence | Internal or external |
| Input Configuration | Single-ended or differential (selectable) |
| Boîtier | 16-QSOP (0.154 inch, 3.90 mm width) |
| Température de fonctionnement | 0 °C to +85 °C |
| Type de montage | Surface Mount |
| Packaging (Tube / Reel) | Tube (VQR suffix = tape and reel per industry convention; verify on order) |
| Statut RoHS | Compliant (per distributor listing) |
Configuration des broches de TC3402VQR
| Broche 1 | VDD — Positive supply (+1.8 V nominal) |
| Broche 2 | GND — Ground |
| Broche 3 | AIN1 — Analog input channel 1 (single-ended or +differential) |
| Broche 4 | AIN2 — Analog input channel 2 (single-ended or -differential) |
| Broche 5 | AIN3 — Analog input channel 3 |
| Broche 6 | AIN4 — Analog input channel 4 |
| Broche 7 | REF+ — Reference voltage positive input (external) or output (internal) |
| Broche 8 | REF- — Reference voltage negative / GND sense |
| Broche 9 | SDA — Serial data I/O (I²C-compatible) |
| Broche 10 | SCL — Serial clock input |
| Broche 11 | ADDR — Address select for I²C slave address |
| Broche 12 | OSC — Oscillator / system clock pin |
| Broche 13 | CAL — Calibration pin (per Microchip datasheet) |
| Broche 14 | TEST — Factory test pin (leave floating or GND per datasheet) |
| Broche 15 | NC — Not connected (per datasheet) |
| Broche 16 | NC — Not connected (per datasheet) |
Applications typiques
TC3402VQR convient pour 7 applications: Portable Weigh Scales & Load Cells, Handheld Digital Multimeters, Industrial Process Control Transmitters, Battery Monitoring & Fuel Gauging, Portable Medical Monitoring Devices, Temperature/Humidity Data Loggers, Strain-Gauge & Pressure Sensor Signal Chains.
Portable Weigh Scales & Load Cells
The TC3402VQR suits battery-powered weigh-scale designs that demand 16-bit resolution and low 250 µA active current. Its 4-channel differential MUX accepts up to four load-cell bridges directly, eliminating external analog switches and saving PCB area. At 8 conversions per second at 16 bits, the device delivers effective ENOB close to its nominal rating, providing 0.01% FS accuracy for scales up to 50 kg. Place the bridge excitation near VDD and route differential pairs with matched trace lengths. Compared to discrete op-amp + ADC solutions, the integrated MUX cuts BOM by 30%.
Recommandé
Handheld Digital Multimeters
For 3.5-digit to 4.5-digit handheld DMMs, the TC3402VQR provides 16-bit resolution at low throughput, enough to support 20,000-count displays with proper averaging. The +1.8 V supply operation aligns with two-alkaline or single-Li coin-cell batteries, while the 5.5 V-tolerant analog inputs accept direct connection to the 200 mV–600 V measurement ranges through resistive dividers. The 4-channel MUX lets one ADC service voltage, current, resistance, and temperature measurements sequentially. Low Sleep current extends battery life between measurements.
Recommandé
Industrial Process Control Transmitters
In 4–20 mA loop-powered or 24 V bus-powered process transmitters, the TC3402VQR digitizes sensor outputs from thermocouples, RTDs, and pressure bridges. Its 16-bit resolution at 8 conversions/s satisfies the 0.1% accuracy class required by most industrial protocols including HART and Foundation Fieldbus. The 0 °C to +85 °C operating range covers the industrial-temperature envelope. Differential inputs reject common-mode noise from long cable runs in factory environments, eliminating the need for isolation amplifiers in short-range loops.
Recommandé
Battery Monitoring & Fuel Gauging
Battery-management ICs require precise voltage and current measurements across multiple cells. The TC3402VQR's 4-channel input MUX supports direct connection to multiple battery cell voltages or to a current-sense amplifier plus three cell voltages in a 4S Li-ion pack. Its 250 µA active current and low Sleep current minimize parasitic drain on the battery stack itself. 16-bit resolution at 8 conversions/s enables accurate coulomb counting when paired with a sense resistor in the 1–10 mΩ range, supporting fuel-gauge algorithms for runtime estimation.
Recommandé
Portable Medical Monitoring Devices
For portable medical devices such as pulse oximeters, glucose meters, and ambulatory ECG recorders, the TC3402VQR offers 16-bit resolution at low power, ideal for battery-sensor interface signal chains. Its 4-channel MUX supports SpO2 red/IR photodiode readout plus temperature and battery-voltage monitoring on a single IC. The differential input mode rejects common-mode pickup from long patient cables. Low current consumption (250 µA) enables multi-day operation on coin-cell or AAA batteries, and the QSOP package fits the compact form factors required by wearable medical designs.
Recommandé
Temperature/Humidity Data Loggers
Multi-channel data loggers for HVAC, greenhouse, and cold-chain monitoring benefit from the TC3402VQR's 4-channel MUX and low-power Sleep mode. Each channel can connect to a thermistor, RTD, or humidity sensor through a simple interface circuit. With 16-bit resolution at 8 conversions/s and programmable output data rates down to 10-bit at 512 conversions/s, the same IC can service slow temperature logging and faster humidity updates from the same board. Low Sleep current enables battery-powered loggers with 1-year+ battery life on two AA cells.
Recommandé
Strain-Gauge & Pressure Sensor Signal Chains
Bridge-type sensors such as strain gauges and MEMS pressure transducers require high-resolution differential ADCs for accurate readout. The TC3402VQR's differential inputs and 16-bit resolution match the typical 0.1% accuracy class of consumer and industrial pressure sensors. The internal voltage reference option simplifies BOM by eliminating an external reference IC, while the 4-channel MUX supports multi-axis strain measurements on a single chip. This makes the TC3402VQR a strong fit for electronic scales, force-feedback joysticks, and altimeter/barometer modules.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TC3402VQR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | TC3402VQ | TC3402VQRTR | MCP3421A0T-E/CH | LTC2400CS8 | ADS1115IDGSR |
|---|---|---|---|---|---|---|
| Package | 16-QSOP | 16-QSOP - same | 16-QSOP - same | SOT-23-6 - different | SOIC-8 - different | MSOP-10 - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Analog Devices | Texas Instruments |
| Resolution | 16-bit | 16-bit | 16-bit | 18-bit | 24-bit | 16-bit |
| Number of Input Channels | 4 | 4 | 4 | 1 | 1 | 4 |
| Maximum Sample Rate (16-bit) | 8 conversions/s | 8 conversions/s | 8 conversions/s | 3.75 conversions/s (18-bit) | 5 conversions/s (24-bit ext ref) | 8 conversions/s (16-bit) |
| Supply Voltage | +1.8 V (5.5 V tolerant inputs) | +1.8 V (5.5 V tolerant) | +1.8 V (5.5 V tolerant) | +2.7 V to +5.5 V | +2.7 V to +5.5 V | +2.0 V to +5.5 V |
| Active Supply Current | 250 µA | 250 µA | 250 µA | 39 µA (typical) | 200 µA (typical) | 150 µA (typical) |
| Data Interface | Serial (2-wire, I²C-compatible) | Serial (2-wire) | Serial (2-wire) | Serial (2-wire) | Serial (SPI-compatible) | Serial (I²C) |
Principaux différenciateurs
- Integrated 4-channel input multiplexer (vs MCP3421A0T-E/CH)
- Ultra-low +1.8 V supply operation (vs LTC2400CS8)
- Differential and single-ended input flexibility (vs ADS1115IDGSR)
Notes de conception
Estimated: at +1.8 V supply with 250 µA typical active current, the TC3402VQR dissipates only ~0.45 mW during conversion. Bypass VDD with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin and a 1 µF tantalum or larger bulk capacitor on the same node. In Sleep mode, total quiescent current falls substantially; consult the Microchip datasheet for the exact sleep-current specification before sizing the battery. Keep analog and digital ground returns joined at a single star point under the IC body.
Route analog input traces as differential pairs with matched trace lengths and a ground guard on each side to minimize common-mode pickup. Keep the analog input traces away from the SCL/SDA digital lines and cross them only at 90° if absolutely necessary. Place the optional REF decoupling capacitor (typically 0.1 µF ceramic) directly across REF+ and REF− pins. The QSOP-16 package has a small body and exposes the die to thermal coupling — avoid placing heat-generating components directly above the IC.
The TC3402VQR's sigma-delta modulator is sensitive to high-frequency interference injected through the analog inputs. Add a simple RC low-pass filter (typically 1 kΩ + 1 nF) on each AIN pin for sensor inputs located more than 50 mm from the IC. For differential bridge measurements, use a common-mode choke or ferrite bead on the input cable to suppress RF pickup. The internal digital filter provides substantial 50 Hz / 60 Hz mains rejection at appropriate data rates, simplifying anti-aliasing requirements.
Do not exceed the +1.8 V supply rating on VDD; although analog inputs are 5.5 V tolerant, the supply itself must remain within the published range. Avoid leaving the ADDR pin floating — tie it to VDD or GND through 10 kΩ to set a stable I²C address. Ensure the SCL and SDA lines are pulled up to VDD (not to a higher rail) using 4.7 kΩ resistors for typical bus capacitances. Always perform a software calibration sequence (per Microchip application note) after power-up to null out internal offset; skip this step and expect ~1 LSB of initial offset error.
Informations de conformité
RoHS compliance per distributor listing. Not AEC-Q100 qualified — not intended for automotive applications. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020. Halogen-free status not explicitly stated in available data.
