MCP3302-BI/P - 13-Bit SPI ADC, 100 ksps, 14-PDIP | Microchip Technology
부품 번호: MCP3302-BI/P ✓ 활성MCP3302-BI/P 개요
An SAR ADC is a category of data-conversion IC that converts an analog voltage into a digital code by comparing the input against a capacitor DAC and successively refining a binary approximation through a comparator. In the broader hierarchy, an ADC is a data converter, which is a data acquisition building block, which sits inside a mixed-signal signal-chain IC alongside op amps, references and interfaces. SAR converters trade resolution-per-conversion speed for very low power and low cost, making them the default choice for slow sensor signals rather than high-bandwidth waveform capture.
Key features of the MCP3302-BI/P include true differential analog inputs, an SPI interface with chip select, serial data input and clock pins that can run from a simple microcontroller, low standby current for portable instruments, and a 14-pin PDIP package that is easy to prototype and hand-solder. The -BI/P ordering code designates the 13-bit, industrial-temperature PDIP variant supplied in tubes.
Technically, the device uses a sample-and-hold front end ahead of the SAR conversion core, so the input is frozen during each conversion cycle. Multiple inputs are multiplexed, meaning only one analog node is connected to the internal DAC and comparator at a time. The differential architecture means the converter measures V(+) minus V(-), which rejects common-mode noise if the two wires are routed as a differential pair.
Typical applications include battery-powered environmental monitoring, precision temperature and pressure sensor acquisition with thermocouple or ratiometric bridges, industrial 4-20 mA loop receivers, and low-rate energy metering. Companion silicon commonly includes SPI-capable microcontrollers such as ATMEGA328P-MNR, RS-485 transceivers such as SP490CN-L/TR for remote field buses, and digital I/O expanders such as PCA9554DBR.
A key design consideration is the reference voltage: accuracy of the converted code is bounded by the stability and noise of the VREF pin, so a clean, decoupled reference and adequate input filtering are mandatory for accurate results. The MCP3302-BI/P is a 14-pin PDIP, so newer designs may prefer the SOIC-14 variant.
This page combines verified distributor listings, a drop-in replacement review, and practical design notes that go beyond the manufacturer datasheet summary, including interface timing notes, filtering guidance and part-to-part trade-offs.
드롭인 대체품: MCP3302-BI/P — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MCP3302-BI/P (동일 폼 팩터 및 풋프린트) — 차이점: Resolution.
MCP3302-AI/P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MCP37D20-200I/TE
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP37D11-200I/TE
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP3301-BI/P
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →MCP3208-BI/P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MCP3302-BI/P 최대 정격 & 전기적 특성
| 분해능 | 13 bits (12-bit plus sign) |
| Number of Input Channels | 4 single-ended / 2 differential |
| Architecture | Successive Approximation (SAR) |
| 샘플링 속도 | 100 ksps |
| Analog Input Type | Fully differential |
| Serial Interface | SPI (4-wire, industry-standard) |
| Package Type | 14-pin PDIP |
| 핀 수 | 14 pins |
| Shipping Container | Tube |
| Product Status | Active |
| Manufacturer | Microchip Technology |
| Differential Input | 2 differential pairs, 4 single-ended inputs |
| Low Power Consumption | Low power design targeted at battery-powered and remote data acquisition systems |
MCP3302-BI/P 핀 구성
| 핀 1 | CS — Chip select active-low, enables SPI conversion frame |
| 핀 2 | DIN — Serial data input to configure channel and gain |
| 핀 3 | SCLK — Serial clock input |
| 핀 4 | DOUT — Serial data output, conversion result |
| 핀 5 | D0- — Differential input 0 negative / single-ended channel 0 |
| 핀 6 | D0+ — Differential input 0 positive / single-ended channel 0 |
| 핀 7 | D1- — Differential input 1 negative / single-ended channel 1 |
| 핀 8 | D1+ — Differential input 1 positive / single-ended channel 1 |
| 핀 9 | VREF+ — Positive reference input |
| 핀 10 | VREF- — Negative reference input |
| 핀 11 | VDD — Positive supply input |
| 핀 12 | VSS — Ground reference |
| 핀 13 | AGND — Analog ground connection |
| 핀 14 | AVDD — Analog positive supply input |
일반적인 애플리케이션
MCP3302-BI/P 적합 용도: 6 애플리케이션s: Battery-Powered Environmental Monitoring, Precision Temperature and Bridge Sensor Acquisition, 4-20 mA Process Loop Receiver, Low-Rate Energy and Power Metering, Portable Instrument Front Panel, Robotics and Condition Monitoring Node.
Battery-Powered Environmental Monitoring
The MCP3302-BI/P suits remote environmental nodes because it combines a 13-bit SAR core with the low power consumption called out in the Microchip MCP3302 product description. A 100 ksps conversion rate is far more than a temperature, humidity or pressure transducer can produce, so the converter can idle between readings while the MCU sleeps, keeping average supply current dominated by the sensor rather than the ADC. The fully differential inputs let the designer reference the sensor signal to a quiet local ground, which reduces errors in long cable runs. Placing the converter on the same 14-pin PDIP footprint as the Microchip SOP parts means a through-hole prototype board can be assembled by hand, and the SPI framing is directly readable by an ATMEGA328P-MNR class microcontroller.
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Precision Temperature and Bridge Sensor Acquisition
Ratiometric pressure, load and force bridge sensors produce small differential signals that are easily swamped by noise, and the MCP3302-BI/P is built for exactly this class of measurement. Its two fully differential input pairs accept a bridge output directly with no single-ended to differential conversion stage, and the 13-bit (12-bit plus sign) code width gives 4096 signed counts across the reference span, which is ample for most industrial bridge ranges. Because the conversion completes in roughly 10 microseconds at the 100 ksps rate, multiple readings can be averaged digitally to reject mains-coupled noise without slowing the acquisition loop. The 14-pin PDIP package exposes CS, DIN, SCLK and DOUT on adjacent pins, so the SPI traces to the host processor remain short.
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4-20 mA Process Loop Receiver
Field transmitters in process control deliver a 4-20 mA current loop that must be converted to a voltage before digitization, and the MCP3302-BI/P closes that loop accurately. The differential input structure accepts the shunt-derived signal without a separate instrumentation amplifier in the signal path, reducing component count and board area. The 13-bit resolution over a 4-20 mA span yields well under 0.1% of span resolution, which meets typical transmitter accuracy requirements, and the 100 ksps rate allows the loop to be sampled fast enough for control-loop feedback. The 14-pin PDIP outline is ideal for a daughtercard that plugs into a larger industrial instrument, while the SPI interface shares a bus with the instrument's main controller.
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Low-Rate Energy and Power Metering
Energy meters sample voltage and current at a modest rate but demand repeatable results across a wide dynamic range, and the MCP3302-BI/P provides that with 12-bit plus sign codes and 100 ksps throughput. Two differential channels let one converter capture both a voltage sense and a current sense signal from the same shunt, so the metering algorithm can compute real power and power factor without two separate converters and the associated calibration drift between them. The SAR architecture also settles quickly after a change of input multiplexer, which keeps channel-to-channel crosstalk low during sequential sampling. With the MCP3302-BI/P in a 14-pin PDIP, a metering engine prototype can be hand-assembled, and the SPI bus coexists with the meter's display and communications peripherals.
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Portable Instrument Front Panel
Handheld analyzers and calibrators need a wide-input-range ADC that shares a compact board with a display and a communications port. The MCP3302-BI/P fits that budget of pins and power: the 14-pin PDIP concentrates all analog and digital functions on one device, and the SPI interface requires only four lines, which is easy to route on a crowded two-layer PCB. At 100 ksps the converter can acquire audio-band-limited waveforms for display while still consuming little power between measurements, extending battery life in field service equipment. The differential inputs also simplify front-panel conditioning, because the attenuator and buffer network can drive a balanced signal into a single converter rather than into separate single-ended channels.
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Robotics and Condition Monitoring Node
Condition-monitoring nodes on machines and robots measure vibration proxies, temperature drift and actuator position, all of which are slow signals spread across a distributed bus. The MCP3302-BI/P gives each node a 13-bit measurement channel that can be read over SPI and then forwarded, while the differential inputs allow the sensor to be wired as a balanced pair so that common-mode pickup from motor inverters is rejected. Because a single converter handles four single-ended inputs, one node can multiplex between two sensors rather than deploying two converters, keeping board area and cost low for dozens of nodes. The 14-PDIP package is compatible with the through-hole assembly used in ruggedized node enclosures, and the SP490CN-L/TR class transceiver handles the field bus link.
추천
추천 제품 요약
엔지니어링 참조 데이터: MCP3302-BI/P — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MCP3302-AI/P | MCP37D20-200I/TE | MCP37D11-200I/TE | MCP3301-BI/P | MCP3208-BI/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-PDIP (tube) | 14-PDIP (tube) - same | 14-PDIP (tube) - same | 14-PDIP (tube) - same | 14-PDIP (tube) - same | 14-PDIP (tube) - same |
| Resolution | 13 bits (12-bit plus sign) | 12-bit class | 14 bits | 12 bits | 13 bits (12-bit plus sign) | 13 bits (12-bit plus sign) |
| Sampling Rate | 100 ksps | 100 ksps | 200 ksps | 200 ksps | 100 ksps | 100 ksps |
| Interface | SPI 4-wire | SPI 4-wire | SPI | SPI | SPI 4-wire | SPI 4-wire |
| Conversion Architecture | Successive Approximation (SAR) | Successive Approximation (SAR) | Successive Approximation (SAR) | Successive Approximation (SAR) | Successive Approximation (SAR) | Successive Approximation (SAR) |
| Product Status | Active | Active | Active | Active | Active | Active |
| Low Power Design | Yes - targeted at battery-powered and remote data acquisition | Yes | Yes | Yes | Yes | Yes |
주요 차별점
- Differential 13-bit input in a low-cost 14-pin PDIP (vs MCP3208-BI/P)
- Half the throughput of the MCP37D20 at equal resolution class, allowing simpler SPI timing (vs MCP37D20-200I/TE)
- One more bit of code width than the 12-bit alternatives (vs MCP37D11-200I/TE)
- Four inputs per converter instead of two (vs MCP3301-BI/P)
설계 노트
The MCP3302-BI/P is a differential-input SAR ADC, so the analog input traces must be routed as a matched pair with a continuous ground reference underneath. Keep the D0-/D0+ and D1-/D1+ connections short, away from the SPI clock and from switching converter inductors, and place an RC anti-alias filter (typically a few tens of ohms in series with 10 nF to 100 nF to ground) at the ADC pins. Because the SAR input impedance is sampled during the sample-and-hold window, adding source impedance increases settling error at the 100 ksps rate; keep the driver impedance low or extend the acquisition time.
The VREF pins are the accuracy anchor of the converter: every code step is a fraction of the reference voltage, so reference noise appears directly as measurement noise. Place a high-quality bypass capacitor (0.1 uF ceramic) directly across VREF+ and VREF- to ground, decouple VDD and AVDD locally, and if the application is ratiometric (bridge or potentiometer), derive the reference from the same excitation source so supply drift cancels. Never route the SPI clock (SCLK) in parallel with the analog inputs, and keep the DOUT trace away from the reference node.
A frequent design error is assuming the MCP3302-BI/P can drive or sink excitation current: it is a high-impedance measurement input and cannot source sensor power. Another common mistake is ignoring the MUX settle time when switching between channels - after writing the channel configuration on DIN, the host must allow the sample-and-hold to acquire the new input before reading DOUT. Finally, confirm the reference polarity and the sign of the differential result in software, since the MCP3302 reports a signed code and swapping the Dx+ and Dx- connections inverts every reading.
Although the MCP3302-BI/P is a through-hole DIP-14 part, the analog and digital returns still need disciplined partitioning: keep the analog ground region under and around the ADC free of switching return currents, and tie analog and digital grounds together at a single low-impedance point near the converter's VSS pins. When using the DIP footprint on a mixed-signal board, insert the converter near the connector or sensor header rather than near the digital processor, and provide a dedicated analog ground pour in the layer beneath pins 5 through 14 to reduce ground bounce coupling into the sample-and-hold front end.
Estimated: at a 5.0 V reference and a 3.3 V digital supply, average ADC power is dominated by conversion activity, so duty-cycling conversions (converting a handful of times per second instead of continuously) reduces average current sharply compared with a continuously sampling design. For battery deployments, budget the converter quiescent current together with the SPI pull-ups and any always-on reference, and note that the 100 ksps capability is normally far in excess of what the sensor can deliver, so the system should idle the converter between measurement bursts.
규정 준수 정보
The verified data for this part covers distributor listings, the manufacturer MCP3302 product page and comparison records; it does not contain explicit RoHS, REACH, AEC-Q100 or conflict-minerals statements, so all fields are reported as unknown rather than assumed. One distributor catalogue entry lists an AEC-Q100 attribute, but that could not be corroborated from the manufacturer datasheet and is therefore not treated as a qualification claim.