MCP3301-BI/MS - 13-Bit Differential SPI ADC | Microchip
MPN: MCP3301-BI/MS ✓ Hoạt độngMCP3301-BI/MS Tóm tắt
An analog-to-digital converter is an integrated circuit that converts a continuous voltage at an analog input into a numeric code for processing, control, display, or data logging. The MCP3301 belongs to the SAR ADC hierarchy, where a sample-and-hold circuit and internal comparator successively resolve the input voltage. Its differential architecture measures the voltage between the AIN0+ and AIN0- pins, which helps reject common-mode noise when the sensor output is referenced to a shared ground.
Key device characteristics include 13-bit resolution, a maximum conversion throughput of 100 ksps, full differential input capability, an SPI serial interface, and single-supply operation from a 5.5 V maximum supply. The datasheet also specifies differential nonlinearity and integral nonlinearity limits of plus or minus 1 LSB for the MCP3301 grade. Its compact 8-MSOP footprint suits battery-powered instruments and remote data-acquisition nodes where board area and standby power are important.
The conversion core uses a sample-and-hold architecture, while the serial interface supports serial input and output functions on shared clock and data pins. The device accepts an external reference voltage, allowing measurement accuracy to be scaled to the analog signal chain. Because the MCP3301 has one differential channel rather than multiple single-ended inputs, channel multiplexing is not required, and differential source impedance should remain balanced for best performance.
Typical applications include battery-powered environmental sensors, industrial pressure and temperature transmitters, remote process-monitoring nodes, laboratory measurement instruments, and low-power data loggers. The SPI interface makes the converter suitable for designs using a microcontroller with a dedicated or general-purpose serial controller.
The main design consideration is the relationship between reference accuracy, source impedance, and digital noise coupling. Place the reference and analog input traces away from high-current switching paths, use a quiet reference source, and follow the manufacturer datasheet layout and bypass recommendations. Verify acquisition timing in firmware because each conversion requires a sample period followed by bit transfer over the serial interface.
This page combines the Microchip product information and datasheet with package details, purchasing guidance, comparison parameters, and practical integration notes that help engineers evaluate the MCP3301-BI/MS for low-power precision measurement designs.
Bộ thay thế dễ dàng lắp đặt cho MCP3301-BI/MS — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
MCP3301-CI/MS
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MCP3301-AI/MS
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MCP3301-BI/MS Tỷ lệ tối đa & tính chất điện
| Converter Type | Successive-approximation analog-to-digital converter (SAR ADC) |
| Độ phân giải | 13 bit |
| Input Channels | 1 differential input channel |
| Input Configuration | Fully differential input |
| Maximum Sampling Rate | 100 ksps |
| Supply Configuration | Single supply |
| Maximum Supply Voltage | 5.5 V |
| Serial Interface | SPI-compatible serial interface |
| Differential Nonlinearity | +/-1 LSB maximum |
| Integral Nonlinearity | +/-1 LSB maximum for MCP3301-B |
| Hộp | 8-MSOP, 0.118 in (3.00 mm) width |
| Kiểu lắp đặt | Surface mount |
| Số lượng chân | 8 pins |
Cấu hình chân MCP3301-BI/MS
| Chân 1 | VREF+ — Positive external reference voltage input |
| Chân 2 | VREF- — Negative external reference voltage input |
| Chân 3 | AIN0+ — Positive differential analog input |
| Chân 4 | AIN0- — Negative differential analog input |
| Chân 5 | GND — Ground reference connection |
| Chân 6 | CS — Active-low chip-select serial interface input |
| Chân 7 | SCLK/DIN — Serial clock and serial data input |
| Chân 8 | DOUT — Serial data output |
Ứng dụng tiêu biểu
MCP3301-BI/MS phù hợp cho 6 Áp dụngs: Battery-Powered Environmental Sensors, Industrial Pressure and Temperature Transmitters, Remote Data-Acquisition Nodes, Precision Laboratory Measurement Instruments, Battery-Powered Data Loggers, Process-Control Analog Input Modules.
Battery-Powered Environmental Sensors
The MCP3301-BI/MS fits battery-powered environmental monitoring when the front end must resolve a small differential sensor signal rather than a large ground-referenced voltage. Its one fully differential channel allows the sensor output and return to connect directly to AIN0+ and AIN0-, helping reject noise shared by both conductors. The 100 ksps throughput supports periodic temperature, humidity, or gas-sensor readings without imposing a high sampling burden on the host controller. Its single-supply operation up to 5.5 V also simplifies system partitioning around battery-regulated rails. In a practical design, use the external reference pins for a stable ratio reference and follow the manufacturer input-network and bypass recommendations.
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Industrial Pressure and Temperature Transmitters
The MCP3301-BI/MS is appropriate for compact industrial transmitters that digitize a conditioned bridge or temperature-sensor signal. The fully differential input supports balanced sensor excitation and rejects ground-offset errors that would otherwise reduce measurement accuracy. With 13-bit resolution and a 100 ksps maximum rate, the converter can sample the settled analog node rapidly while the transmitter electronics handle scaling, isolation, and communication. The 8-MSOP package keeps the analog section compact, and the -BI industrial ordering supports designs intended for extended-temperature operation. Place the converter close to the sensor front end and keep the reference and analog paths physically separated from switching and high-current nodes.
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Remote Data-Acquisition Nodes
The MCP3301-BI/MS works well in distributed data-acquisition nodes that monitor one critical analog channel in a remote enclosure. The fully differential input helps preserve the integrity of a sensor signal over longer cable or board runs, while the SPI-compatible interface allows the host processor to retrieve each 13-bit conversion code efficiently. A maximum rate of 100 ksps provides margin for oversampling and digital filtering without demanding an architecture intended for high-channel-count acquisition. The compact 8-MSOP package is valuable where board area is constrained. Use the manufacturer reference circuit, provide local decoupling, and verify that the digital clock and chip-select lines do not couple into the differential input during the sampling interval.
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Precision Laboratory Measurement Instruments
The MCP3301-BI/MS can serve as the input converter in a precision laboratory instrument that measures one differential voltage at a time. The 13-bit result provides 8192 quantization levels, and differential sampling reduces sensitivity to common-mode voltage on cables, connector contacts, and analog input networks. At 100 ksps, successive readings can be averaged digitally to improve effective resolution when the source noise permits it. The SPI interface allows a deterministic connection to an embedded controller, while the small 8-MSOP footprint preserves space for display, communication, and power-conditioning circuitry. For best performance, use a low-noise reference, balanced analog routing, and shielding or guarding when the measured source can exceed several volts.
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Battery-Powered Data Loggers
The MCP3301-BI/MS is suitable for low-duty-cycle data logging when each sensor reading is captured on a schedule and then stored. The device's 100 ksps maximum rate allows short acquisition bursts, while its one-channel differential architecture eliminates an analog multiplexer and the associated channel-switching network. The 8-MSOP footprint leaves more board area for storage, power management, and radio hardware. Differential input routing further improves robustness in portable systems where ground currents and battery return paths can create voltage offsets. The firmware should power down between measurement intervals when the application permits, and the analog reference should be disabled or configured consistently with the manufacturer guidance when it is not needed.
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Process-Control Analog Input Modules
The MCP3301-BI/MS can digitize a single conditioned process variable in a compact analog input module. The fully differential input accepts the output of an instrumentation amplifier or active transducer, and the SPI interface provides a straightforward connection to a module controller. A 100 ksps conversion rate is more than adequate for most temperature, pressure, and slow process variables, while 13-bit resolution provides useful measurement granularity after transducer scaling. The -BI industrial ordering fits modules designed for extended-temperature environments, and the 8-MSOP package allows several measurement channels to be placed on one controller board. Each channel should still use its own isolated or protected front end, with the MCP3301 reference and analog routing kept away from digital switching activity.
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Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MCP3301-BI/MS — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MCP3301-CI/MS | MCP3301-AI/MS |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 8-MSOP | 8-MSOP - same footprint | 8-MSOP - same footprint |
| Resolution | 13 bit | 13 bit | 13 bit |
| Input Channels | 1 fully differential channel | 1 fully differential channel | 1 fully differential channel |
| Maximum Sampling Rate | 100 ksps | 100 ksps | 100 ksps |
| Interface | SPI-compatible serial interface | SPI-compatible serial interface | SPI-compatible serial interface |
| Supply Configuration | Single supply, 5.5 V maximum | Single supply, 5.5 V maximum | Single supply, 5.5 V maximum |
| Temperature Grade | -BI industrial grade | -CI commercial grade | -AI grade |
Bảo phân biệt quan trọng
- Fully differential measurement input (vsMCP3301-CI/MS)
- Single-channel differential ADC without analog multiplexing (vsMCP3301-AI/MS)
- Compact 8-MSOP implementation (vsMCP3301-CI/MS)
Ghi chú thiết kế
Route the AIN0+, AIN0-, VREF+, and VREF- connections as compact analog paths and keep them separated from SCLK, CS, and DOUT traces. The MCP3301 uses a differential input, so maintain reasonably balanced source impedance and avoid routing the two inputs beside unrelated switching nodes. Place input and reference bypass components close to their associated pins using the manufacturer reference-circuit layout.
Treat the SCLK/DIN pin as a shared serial interface connection and observe the setup and hold requirements in the manufacturer datasheet. Because this pin carries clock input during conversion and data input during initialization, the host controller must sequence the interface correctly. Keep the serial traces short, use a defined return path, and avoid routing SCLK directly beneath the differential analog inputs.
Provide local supply decoupling at the device and keep analog reference current separate from noisy digital load paths. The MCP3301-BI/MS operates from a single supply up to 5.5 V, so ensure that every supply excursion remains within the device rating. For low-duty-cycle logging, control power states in firmware only after confirming the manufacturer requirements for reference shutdown and restart behavior.
Do not substitute the ADC for another SPI converter solely because both use eight pins and a similar clock protocol. Verify the complete pin assignment, input range, reference arrangement, initialization sequence, output code format, and acquisition timing. For replacement decisions, compare the MCP3301 family ordering suffixes carefully because their temperature grades affect where the finished equipment can operate.
Thông tin tuân thủ
The manufacturer and distributor records identify the MCP3301-BI/MS as a Microchip Technology 13-bit SPI ADC in an 8-MSOP package, but no explicit compliance declarations were included in the product information. Confirm RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status with Microchip Technology for the exact order code.
