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Microchip Technology TC3400VOA
- Part No.:
- TC3400VOA
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC3400VOA.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
TC3400VOA from Microchip Technology is a low-power, 16-bit sigma-delta analog-to-digital converter optimized for battery-operated embedded systems. It delivers 16-bit resolution at 8 conversions per second (125 ms conversion time), supports adjustable resolution down to 10-bit (28.6 ms), operates from 1.8V–5.5V, draws only 260 µA during conversion and 0.75 µA in sleep mode, and uses a 2-wire microPort™ interface for control and data readout - ideal for CO monitors, thermostats, and portable medical instruments.
For engineers reviewing the TC3400VOA datasheet, TC3400VOA pinout, TC3400VOA application, or TC3400VOA equivalent, key selection considerations include its true differential input architecture, internal/external reference flexibility, resolution-adjustable timing via SCLK edge counting, push-pull SDAT output with built-in busy indication, and SOIC-8 packaging suitable for space-constrained industrial sensor nodes.
Technical Context
The TC3400VOA implements a sigma-delta modulator with integrated clock generator and digital control logic, enabling resolution reduction through up to six falling edges on SCLK within a defined t4 window (t3/85.7 ≈ 1.46 ms for 16-bit). Its differential input stage provides 2.0 MΩ input resistance, 60 µVrms input-referred noise, and 75 dB common-mode rejection at DC.
Conversion data is output serially in two's complement format (sign bit first) via SDAT, synchronized to SCLK falling edges; the device automatically enters sleep mode when idle and asserts SDAT high upon conversion completion to signal readiness - eliminating polling overhead in microcontroller firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit (15-bit + sign) at 8 sps; adjustable to 10-bit at 512 sps - enables trade-off between precision and update rate in sensor logging. |
| Supply Voltage | 1.8V–5.5V - supports direct connection to Li-ion, coin-cell, or 3.3V/5V system rails without regulation. |
| Supply Current | 260 µA during conversion; 0.75 µA in sleep - extends battery life in intermittent-sampling applications like environmental data loggers. |
| Differential Input Range | ±(2×REFIN – 1 LSB); full-scale ±2.386 V with REFOUT (1.193 V) fed to REFIN - matches typical bridge sensor outputs. |
| Integral Non-Linearity | ±0.0038 %FSR - ensures <1 LSB error across full range, critical for calibrated measurement systems. |
| Common-Mode Rejection | 75 dB at DC - suppresses noise from shared ground paths in noisy industrial environments. |
| Reference Options | Internal 1.193 V REFOUT or external 0–1.25 V on REFIN - allows calibration traceability or ratiometric sensing with external references. |
Pinout & Package
TC3400VOA is housed in an 8-pin narrow SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and rated for 0°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN+ | Differential analog input (+) | Positive terminal of true differential pair; accepts voltage up to VDD; used with IN− for noise-immune sensor interfacing. |
| 2: IN− | Differential analog input (−) | Negative terminal; referenced to GND; must not go below GND; defines VIN = (IN+ − IN−). |
| 3: REFIN | Analog reference input | Accepts external reference (≤1.25 V) or internal REFOUT; reference voltage is doubled internally for full-scale scaling. |
| 4: GND | Analog/digital ground | Single ground connection for all circuitry; requires low-impedance layout to minimize noise coupling into sigma-delta modulator. |
| 5: REFOUT | Analog reference output | Provides stable 1.193 V internal reference; can be buffered or scaled externally and fed back to REFIN. |
| 6: SDAT | Push-pull serial data output | Drives low during conversion (busy indicator); outputs MSB→LSB after completion; no pull-up required. |
| 7: SCLK | Digital serial clock input | Edge-triggered: falling edge initiates conversion; additional falling edges in t4 window decrement resolution by 1 bit each. |
| 8: VDD | Power supply input | Supplies entire IC; bypass capacitor (0.1 µF) required near pin for sigma-delta clock stability. |
Key Features
| Feature | Design Value |
|---|---|
| microPort™ 2-wire interface | Reduces MCU GPIO count and PCB routing complexity versus SPI/I²C; eliminates protocol stack overhead. |
| Auto-sleep mode | Eliminates software sleep management; current drops to 0.75 µA without host intervention, simplifying power-state handling. |
| Adjustable resolution/timing | Enables dynamic adaptation: e.g., 16-bit for calibration, 12-bit for real-time feedback - all with same hardware and timing control. |
| True differential input | Rejects common-mode noise from long sensor leads or EMI-prone environments without external instrumentation amplifiers. |
| Internal reference with REFOUT | Provides factory-trimmed 1.193 V source; eliminates need for external precision reference in cost-sensitive consumer and medical devices. |
Applications
| CO Monitor Sensor Interface | Thermostat Ambient Sensing |
|---|---|
Use Scenario: Continuous sampling of electrochemical CO sensor output in battery-powered indoor air quality units. IC Role / Device Role / Timing Role: ADC front-end converting differential sensor voltage to digital values for microcontroller-based concentration calculation and alarm triggering. Use Value: 16-bit resolution captures sub-ppm CO changes; low 260 µA operating current extends 2-year battery life; auto-sleep minimizes quiescent drain between 1-second samples. |
Use Scenario: Precision temperature measurement using thermistor or RTD in residential HVAC control panels. IC Role / Device Role / Timing Role: High-accuracy analog front-end digitizing ratiometric bridge or voltage-divider outputs with minimal external components. Use Value: ±0.0038% FSR INL ensures ±0.1°C accuracy over 0–50°C; internal 1.193 V reference eliminates external voltage reference cost and board space. |
| Portable Humidity Meter | Medical Pulse Oximeter Analog Front-End |
Use Scenario: Handheld hygrometer using capacitive humidity sensor with differential output. IC Role / Device Role / Timing Role: Low-noise sigma-delta ADC capturing small capacitance-to-voltage changes while maintaining ultra-low system power. Use Value: 60 µVrms input-referred noise resolves <0.5% RH steps; 1.8V operation enables direct use of single alkaline cell; SOIC-8 fits compact handheld PCBs. |
Use Scenario: Battery-powered pulse oximeter measuring weak photodiode signals under varying ambient light conditions. IC Role / Device Role / Timing Role: Differential ADC rejecting common-mode interference from LED drive pulses and ambient light modulation. Use Value: 75 dB CMR suppresses LED switching noise; true differential input rejects ground bounce in multi-channel analog signal chains; 10-bit mode enables 512 sps for real-time SpO₂ computation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1100IDBVR | 16-bit, I²C interface, fixed 128 sps, no resolution adjustment, 150 µA active current | Lacks SCLK-driven resolution control; requires I²C bus and pull-ups; better suited for fixed-rate, low-latency systems | Choose when I²C infrastructure exists and resolution adaptability is unnecessary. |
| MCP3421A0T-E/CH | 18-bit, I²C, programmable gain (1×–8×), 15 sps max, 145 µA active current | Higher resolution but slower; PGA adds flexibility for mV-level sensors but increases code complexity | Prefer when microvolt-level sensitivity is required and gain staging justifies added firmware overhead. |
Compared with ADS1100IDBVR and MCP3421A0T-E/CH, the TC3400VOA uniquely combines resolution adjustability, microPort™ simplicity, and ultra-low sleep current - making it optimal for energy-constrained, variable-precision sensor nodes where minimizing GPIO count and firmware footprint is critical.
Availability
TC3400VOA is available at Aetrix Electronics and suitable for CO monitors, thermostats, and portable medical instruments requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for TC3400VOA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and interface ICs, with QS-9000 and ISO 9001 certifications across design and manufacturing facilities.
The TC3400VOA belongs to Microchip's legacy sigma-delta ADC product line, engineered specifically for ultra-low-power, cost-sensitive embedded measurement systems where simplicity, reliability, and battery longevity are primary design drivers.
FAQ
What is the maximum differential input voltage range supported by the TC3400VOA?
The TC3400VOA supports a differential input voltage range of ±(2×REFIN – 1 LSB). With the internal REFOUT (1.193 V) connected to REFIN, the full-scale range is ±2.386 V. Absolute voltage on IN+ or IN− must remain within GND to VDD, and IN− must not fall below GND. This range accommodates standard bridge sensor outputs and thermistor divider configurations without external level-shifting.
How does the TC3400VOA enter and exit sleep mode?
The TC3400VOA automatically enters sleep mode when idle - no command or register write is needed. It exits sleep mode on the first falling edge of SCLK, which simultaneously initiates a conversion. During sleep, supply current drops to 0.75 µA (typical), and both SDAT and SCLK lines remain high. This autonomous behavior eliminates firmware sleep/wake management overhead in the host microcontroller.
Can the TC3400VOA use an external reference, and what are the voltage limits?
Yes, the TC3400VOA accepts an external reference voltage applied to the REFIN pin. The valid range is 0 V to 1.25 V. The internal reference voltage (REFOUT = 1.193 V) is designed to be connected directly to REFIN, but users may substitute a precision external reference - for example, to enable ratiometric measurements with a stable voltage source or to calibrate out system gain errors.
What is the function of the SDAT pin during and after conversion?
During conversion, SDAT is driven low to indicate "busy" status - providing hardware flow control without polling. Upon completion, SDAT goes high to signal readiness. Subsequent falling edges on SCLK then shift out the 16-bit (or reduced-resolution) two's complement data word, MSB-first. This push-pull output requires no external pull-up resistor and simplifies interface timing compared to open-drain protocols.
Is the TC3400VOA pin-compatible with other variants in the TC3400 family?
Yes, the TC3400VOA shares identical pinout and electrical behavior with the TC3400VPA (PDIP-8 variant). Both use the same 8-pin SOIC/PDIP footprint, identical pin numbering, and fully interchangeable signal assignments - allowing drop-in replacement between packages based solely on mechanical or thermal requirements without PCB redesign.
TC3400VOA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- microPort™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- I2C
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.8V ~ 5.5V
- Voltage - Supply, Digital:
- 1.8V ~ 5.5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TC3400VOA FAQ
1.How can I place an order for TC3400VOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC3400VOA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TC3400VOA reliable?
The price and inventory of TC3400VOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC3400VOA is usually 5 days.
3.What payment methods are accepted for TC3400VOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC3400VOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC3400VOA?
TC3400VOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC3400VOA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TC3400VOA?
For technical support, including TC3400VOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC3400VOA requirements.
6.How does Aetrix verify that TC3400VOA is sourced from the original manufacturer or authorized distributors?
All TC3400VOA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TC3400VOA meets industry standards.
7.What is the process for return or replacement of TC3400VOA?
All TC3400VOA units undergo pre-shipment inspection (PSI). If there is an issue with TC3400VOA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TC3400VOA part is unused and in its original packaging.
Return procedure for TC3400VOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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