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Microchip Technology MCP3302-BI/ST
- Part No.:
- MCP3302-BI/ST
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP3302-BI/ST.pdf
- Description:
- IC ADC 13BIT SAR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,064
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Product details
Overview
MCP3302-BI/ST from Microchip Technology is a 13-bit successive-approximation analog-to-digital converter (ADC) with full differential inputs, SPI serial interface, and user-programmable configuration for two differential or four single-ended channels. It delivers ±1 LSB INL and DNL, 100 ksps sampling rate at 5V, and operates from 4.5V to 5.5V supply - ideal for precision remote sensor interfacing in battery-constrained industrial data acquisition systems.
For engineers reviewing the MCP3302-BI/ST datasheet, MCP3302-BI/ST pinout, MCP3302-BI/ST application, or MCP3302-BI/ST equivalent, key selection criteria include its 13-bit bipolar resolution with two's complement output, low 450 µA active current and 1 µA max standby current, differential input rejection capability, and compatibility with PIC® microcontroller SPI peripherals.
Technical Context
The MCP3302-BI/ST implements a 13-bit SAR architecture with integrated sample-and-hold circuitry, requiring 1.5 clock cycles for acquisition and 13 clock cycles for conversion. Its full differential input stage supports common-mode rejection of 79 dB and channel-to-channel crosstalk below –110 dB, enabling accurate measurement of small differential signals amid noise.
It uses an external reference voltage (0.4 V to VDD) to set input span and LSB size (e.g., 98 µV at 400 mV VREF), and features binary two's complement coding with sign bit first output over SPI. The CS/SHDN pin controls both communication initiation and power-down mode, reducing current to ≤1 µA when high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 13-bit (12 data bits + sign bit): enables ±4095 code range for bipolar measurements with 98 µV to 1.22 mV LSB step size depending on VREF. |
| INL / DNL | ±1 LSB max (B-grade): ensures monotonicity and end-point linearity critical for closed-loop control and calibration-sensitive transducer interfaces. |
| Sampling Rate | 100 ksps at 5V: supports real-time monitoring of dynamic signals up to ~40 kHz (Nyquist-limited) in industrial sensor applications. |
| Supply Range | 4.5V to 5.5V: guarantees full specified performance including accuracy and speed; operation down to 2.7V supported but with derated specs. |
| Active Current | 450 µA max at 5V: allows integration into low-power systems without thermal or battery-life penalties during continuous conversion. |
| Standby Current | 1 µA max: enables rapid wake-from-sleep response while minimizing quiescent drain in intermittently active remote nodes. |
| Reference Range | 0.4 V to VDD: permits flexible scaling - e.g., 2.5V reference yields ±2.5V full-scale differential input and 610 µV LSB. |
Pinout & Package
The MCP3302-BI/ST is housed in a 14-pin SOIC package (3.9 mm × 8.7 mm, 1.27 mm pitch), compatible with standard surface-mount assembly and reflow profiles. Pin 1 is CH0; pin 14 is VDD. DGND and AGND must be tied together at a single point near the device for optimal noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 | Analog input channels | Support full differential (CH0+/CH1−, CH2+/CH3−) or four single-ended inputs; absolute voltage range: –0.3 V to VDD + 0.3 V. |
| CS/SHDN | Chip select / shutdown control | Pulled low to initiate conversion and enable SPI; pulled high to halt conversion and enter ≤1 µA standby mode. |
| DIN | SPI serial data input | Latches channel configuration and mode bits on rising CLK edge; required for selecting differential vs. single-ended operation. |
| DOUT | SPI serial data output | Shifts out 13-bit two's complement result MSB-first on falling CLK edges; tri-stated when CS/SHDN is high. |
| CLK | SPI clock input | Drives acquisition (1.5 cycles) and conversion (13 cycles); max 2.1 MHz at 5V; min 105 kHz required to prevent charge bleed errors. |
| VREF | External reference voltage input | Sets full-scale differential span (±VREF); LSB = 2×VREF/8192; requires local 0.1 µF bypass for stability. |
| AGND / DGND | Analog & digital ground | Must be connected at single point near device; separation compromises INL, CMRR, and noise floor. |
| VDD | Power supply | 4.5–5.5V for full spec compliance; 0.1 µF ceramic capacitor mandatory at pin for PSR >74 dB. |
Key Features
| Feature | Design Value |
|---|---|
| Full differential input architecture | Enables rejection of common-mode noise up to 79 dB, critical for noisy industrial environments and long-line sensor interfaces. |
| User-configurable input mapping | Software-selectable between two differential pairs or four single-ended channels via DIN command - no hardware change required. |
| Low-power standby mode | Reduces current to ≤1 µA via CS/SHDN high assertion, supporting energy harvesting and battery life extension in wireless sensor nodes. |
| High dynamic performance | 78 dB SINAD and 92 dB SFDR at 1 kHz allow accurate digitization of low-amplitude signals in presence of harmonics and spurs. |
| Robust SPI timing margin | Supports clock frequencies from 105 kHz to 2.1 MHz with defined setup/hold (50 ns) and output valid (125 ns) windows for reliable MCU interfacing. |
Applications
| Remote Data Acquisition | Portable Instrumentation |
|---|---|
|
Use Scenario: Distributed temperature/pressure sensors in oil & gas field equipment, transmitting readings over RS-485 or LoRaWAN. IC Role / Device Role / Timing Role: Primary ADC capturing differential thermocouple or bridge outputs with high CMRR to reject EMI from motors and inverters. Use Value: ±1 LSB INL ensures <±0.025% FS accuracy across –40°C to +85°C, eliminating need for per-node calibration in multi-sensor arrays. |
Use Scenario: Handheld multimeter or portable oscilloscope front-end measuring AC/DC voltage, current, and resistance. IC Role / Device Role / Timing Role: Bipolar 13-bit ADC converting pseudo-differential inputs with 2.5V reference to support ±2.5V full-scale ranges. Use Value: 450 µA active current and 1 µA standby enable >100-hour battery life in sleep-wake cycling, while 100 ksps supports basic waveform capture. |
| Transducer Interface Module | Battery-Operated Environmental Monitor |
|
Use Scenario: Industrial load cell or strain gauge signal conditioning module with isolated analog output or digital reporting. IC Role / Device Role / Timing Role: High-precision differential ADC rejecting common-mode noise from 4–20 mA loop drivers and switching power supplies. Use Value: 79 dB CMRR and <–110 dB crosstalk preserve signal integrity when multiplexing multiple bridge sensors on shared PCB layout. |
Use Scenario: Solar-powered air quality node measuring PM2.5, CO₂, and humidity using electrochemical and NDIR sensors. IC Role / Device Role / Timing Role: Low-quiescent ADC acquiring slow-varying analog sensor outputs with programmable single-ended mode for mixed sensor types. Use Value: Configurable VREF (0.4–5V) allows matching LSB size to sensor output range - e.g., 400 mV reference yields 98 µV resolution for low-output gas sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 13-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP3302-CI/ST | ±2 LSB max INL (vs. ±1 LSB for B-grade); otherwise identical pinout, timing, and electrical specs. | Suitable for cost-sensitive applications where <±0.05% FS linearity is acceptable, such as non-critical industrial monitoring. | Select MCP3302-CI/ST only if system-level calibration compensates for higher INL; avoid in closed-loop feedback paths. |
| ADS7816U | 12-bit resolution, 200 ksps, internal reference, no differential input - requires external instrumentation amplifier for differential signals. | Better suited for high-speed unipolar acquisition (e.g., motor phase current) where resolution >12 bits is not required. | Choose ADS7816U when board space is constrained and internal reference simplifies design; not a functional replacement for differential sensing. |
Compared with MCP3302-CI/ST, the MCP3302-BI/ST provides tighter linearity for metrology-grade measurements; compared with ADS7816U, it offers true differential input and superior noise immunity but requires external VREF and careful grounding - making it optimal for precision sensor front-ends where accuracy outweighs speed.
Availability
MCP3302-BI/ST is available at Aetrix Electronics and suitable for remote data acquisition, portable instrumentation, and transducer interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP3302-BI/ST 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 Inc. is a leading provider of microcontrollers, analog devices, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.
The MCP3302-BI/ST belongs to Microchip's precision SAR ADC product line, designed specifically for low-power, high-accuracy analog sensing in resource-constrained embedded systems where differential noise rejection and SPI simplicity are essential.
FAQ
What is the maximum sampling rate of the MCP3302-BI/ST, and under what conditions is it guaranteed?
The MCP3302-BI/ST achieves a maximum sampling rate of 100 ksps when operated at VDD = 5V and FCLK = 2.1 MHz (21 × FSAMPLE). This rate is fully specified across the industrial temperature range (–40°C to +85°C) and requires VREF = 5V and proper bypassing. At lower supply voltages (e.g., 2.7V), the maximum rate decreases due to timing constraints.
Does the MCP3302-BI/ST support true differential input mode, and how is it configured?
Yes, the MCP3302-BI/ST supports true full differential input mode using CH0/CH1 and CH2/CH3 as independent differential pairs. Configuration is performed via the DIN command during SPI initialization - no external hardware changes are needed. Each pair measures (IN+) – (IN–) with ±VREF full-scale range and inherent common-mode rejection.
What is the significance of the 'B' grade in MCP3302-BI/ST, and how does it affect system accuracy?
The 'B' grade denotes ±1 LSB maximum integral and differential nonlinearity over temperature - a tighter specification than the 'C' grade (±2 LSB). For the MCP3302-BI/ST, this translates to <±0.025% full-scale error without calibration, directly improving accuracy in closed-loop control, sensor linearization, and metrology applications where end-point fidelity is critical.
Can the MCP3302-BI/ST operate from a 3.3V supply, and what performance trade-offs apply?
The MCP3302-BI/ST is characterized for full performance from 4.5V to 5.5V. While it functions down to 2.7V, key specs including sampling rate, INL/DNL, and PSR are not guaranteed below 4.5V. At 3.3V, maximum sampling rate drops to ~60 ksps, and active current reduces to ~200 µA - useful for ultra-low-power modes but with derated accuracy and speed.
How does the CS/SHDN pin function in the MCP3302-BI/ST, and what is its impact on power consumption?
The CS/SHDN pin serves dual roles: pulled low to enable SPI communication and initiate conversions; pulled high to terminate conversion and place the MCP3302-BI/ST in standby mode drawing ≤1 µA. This pin must be toggled between conversions - it cannot remain low for continuous sampling - ensuring minimal power use during idle periods in battery-operated systems.
MCP3302-BI/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 13
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 14-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3302-BI/ST FAQ
1.How can I place an order for MCP3302-BI/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3302-BI/ST 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 MCP3302-BI/ST reliable?
The price and inventory of MCP3302-BI/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3302-BI/ST is usually 5 days.
3.What payment methods are accepted for MCP3302-BI/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3302-BI/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3302-BI/ST?
MCP3302-BI/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3302-BI/ST 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 MCP3302-BI/ST?
For technical support, including MCP3302-BI/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3302-BI/ST requirements.
6.How does Aetrix verify that MCP3302-BI/ST is sourced from the original manufacturer or authorized distributors?
All MCP3302-BI/ST 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 MCP3302-BI/ST meets industry standards.
7.What is the process for return or replacement of MCP3302-BI/ST?
All MCP3302-BI/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP3302-BI/ST, 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 MCP3302-BI/ST part is unused and in its original packaging.
Return procedure for MCP3302-BI/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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