MCP3008-I/SL - 8-Ch 10-Bit SAR ADC, SPI, SOIC-16 | Microchip
MPN: MCP3008-I/SL ✓ Hoạt độngMCP3008-I/SL Tóm tắt
An SAR ADC is a successive-approximation-register analog-to-digital converter - a subtype of data-conversion IC that performs one bit at a time using an internal sample-and-hold plus a comparator against a binary-weighted DAC. SAR ADCs sit in the broader taxonomy of ADC -> data converter -> mixed-signal IC -> semiconductor. Unlike sigma-delta ADCs they require no integration window, giving deterministic latency and excellent DC accuracy, which is why they dominate multi-channel embedded sensing.
Key differentiating features of the MCP3008 are its 8 single-ended (or 4 pseudo-differential) input channels multiplexed onto a single SAR core, an on-chip track-and-hold, and a low-latency SPI interface that uses simple CMOS thresholds rather than true differential signaling. The device accepts SPI clocks up to 3.6 MHz at 5 V and 2 MHz at 2.7 V, and consumes just 320 µA typical during continuous conversion. Built-in sample-and-hold minimizes aperture uncertainty, and the simple command-frame protocol allows any 8-pin microcontroller GPIO port to interface without hardware SPI peripherals.
Architecturally the part integrates an 8-to-1 input MUX, a 10-bit SAR core, a low-drift internal reference, and an SPI slave controller on a single die. The -I grade adds factory-trimmed bandgap and reference scaling for industrial-grade temperature drift, while the SL package uses an industry-standard JEDEC SO-16 footprint that is interchangeable across many manufacturers. Compared with 12-bit alternatives the resolution trade-off is intentional: 10 bits at 200 ksps yields 1024 codes across a 0–VREF range, adequate for thermistors, LDRs, potentiometers and most sensor front ends.
Typical applications include Raspberry Pi / Arduino sensor expansion, multi-channel temperature and process monitoring, battery-cell voltage monitoring in BMS designs, hobbyist data loggers, and low-cost instrumentation front ends. The 8-channel count is well matched to typical MCU board designs where a single chip digitizes a sensor cluster.
Designers should budget for adequate VDD decoupling (100 nF + 10 µF close to the supply pin) and route the SPI lines away from analog traces to limit digital crosstalk into the sample-and-hold. The internal reference (≈2.048 V at 5 V VDD) is sufficient for most 0–5 V applications but an external reference pin is not provided - applications needing absolute accuracy should bias the analog inputs against a known rail.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate the MCP3008-I/SL for new designs and second-source against cross-brand equivalents.
Bộ thay thế dễ dàng lắp đặt cho MCP3008-I/SL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MCP3008-I/SL (cùng hình factor và footprint) — khác nhau ở Number of Input Channels, Package, Architecture, Automotive Qualification, Digital Interface.
MCP3008T-I/SL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MCP3008T-I/SLVAO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MCP3208-CI/SL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MCP3208-BI/SL
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MCP3004-I/SL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7950SDBTR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MCP3008-I/SL Tỷ lệ tối đa & tính chất điện
| Manufacturer | Microchip Technology |
| Part Number | MCP3008-I/SL |
| Chức năng | 10-bit 8-channel SAR ADC with SPI interface |
| Độ phân giải | 10 bit |
| Number of Input Channels | 8 single-ended / 4 pseudo-differential |
| Input Type | Single-ended, pseudo-differential (software-configurable) |
| Architecture | SAR (Successive Approximation Register) |
| Conversion Rate (max) | 200 ksps @ 5 V VDD; 75 ksps @ 2.7 V VDD |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Supply Current (active) | 320 µA typical at 5 V, full throughput |
| Supply Current (standby) | 5 nA typical (CS high) |
| Giao diện | SPI (mode 0,0 and mode 1,1) |
| SPI Clock (max) | 3.6 MHz @ 5 V; 2 MHz @ 2.7 V |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial, -I grade) |
| Hộp | 16-pin SOIC (SL), 3.90 mm body, JEDEC SO-16 |
| Kiểu lắp đặt | Surface Mount |
| Điện áp tham chiếu | Internal VREF ≈ 2.048 V at 5 V VDD |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 1 (unlimited floor life) |
| Automotive Qualification | Not qualified (use MCP3008T-I/SLVAO for automotive) |
Cấu hình chân MCP3008-I/SL
| Chân 1 | CH0 — Analog input channel 0 |
| Chân 2 | CH1 — Analog input channel 1 |
| Chân 3 | CH2 — Analog input channel 2 |
| Chân 4 | CH3 — Analog input channel 3 |
| Chân 5 | CH4 — Analog input channel 4 |
| Chân 6 | CH5 — Analog input channel 5 |
| Chân 7 | CH6 — Analog input channel 6 |
| Chân 8 | CH7 — Analog input channel 7 |
| Chân 9 | DGND — Digital ground |
| Chân 10 | CS/SHDN — Chip select / shutdown (active low) |
| Chân 11 | Din — SPI serial data input |
| Chân 12 | Dout — SPI serial data output |
| Chân 13 | CLK — SPI serial clock |
| Chân 14 | AGND — Analog ground |
| Chân 15 | VREF — Reference voltage input (internal ref ≈ 2.048 V at 5 V VDD) |
| Chân 16 | VDD — Positive supply, 2.7 V to 5.5 V |
Ứng dụng tiêu biểu
MCP3008-I/SL phù hợp cho 6 Áp dụngs: Raspberry Pi / MCU Sensor Expansion Board, Multi-Channel Temperature / Process Monitoring, Battery Cell Voltage Monitoring (BMS Front End), Hobbyist Data Logger / Sensor Cluster, Audio-Level Metering / VU Front End, Low-Cost Instrumentation / Lab Equipment.
Raspberry Pi / MCU Sensor Expansion Board
The MCP3008-I/SL is the canonical 8-channel ADC companion for Raspberry Pi projects that lack an onboard analog-to-digital converter, exposing sensors like LDRs, thermistors, and potentiometers over SPI. Its 200 ksps throughput at 5 V VDD and 3.6 MHz SPI clock saturate easily over bit-banged Pi GPIO, but a hardware SPI overlay reliably delivers 50-100 ksps. The 8 single-ended inputs map cleanly to typical maker projects where four channels is one pin too few and the ADC is the lowest-cost way to add full sensor coverage.
Được đề xuất
Multi-Channel Temperature / Process Monitoring
Industrial process panels use the MCP3008-I/SL to digitize 8 thermocouple, RTD, or 4-20 mA loop signals via external signal conditioning, taking advantage of its -40 °C to +85 °C industrial temperature range and 10-bit resolution. Each channel returns codes 0-1023 against an internal 2.048 V reference, giving ≈2 mV LSB size at full scale - coarse for thermocouples alone but adequate for thermistor bias networks and 0-10 V process signals after scaling. The 5 nA standby current allows a single CS line to power-gate the chip between scans for battery-backed monitoring.
Được đề xuất
Battery Cell Voltage Monitoring (BMS Front End)
Multi-cell lithium battery packs use the MCP3008-I/SL to monitor up to 8 individual cell voltages via resistor dividers, with the SAR architecture giving deterministic single-shot conversion latency critical for cell-balancing control loops. The 320 µA active supply current and 5 nA standby allow low-duty-cycle scanning to minimize parasitic drain on the cells being measured. Designers should add per-channel RC filtering and clamp diodes to protect the 5.5 V absolute-maximum analog inputs from inductive transients during switching of the cell-balancing MOSFETs.
Được đề xuất
Hobbyist Data Logger / Sensor Cluster
Portable data loggers benefit from the MCP3008-I/SL's small SOIC-16 footprint, 8 channels, and modest 320 µA active current when scanning sensor clusters such as accelerometers, photodiodes, soil-moisture probes, and gas-sensor analog outputs. The deterministic SAR conversion latency simplifies timestamping in SD-card logging firmware, and the SPI interface works from any MCU GPIO. With internal reference scaling at 2.048 V at 5 V VDD, typical 3.3 V sensor outputs land in the upper half of the ADC range without active amplification.
Được đề xuất
Audio-Level Metering / VU Front End
Audio applications use the MCP3008-I/SL to digitize rectified-and-filtered line or microphone signals for LED-bar VU metering, where 10-bit resolution is more than adequate to display 30-40 dB dynamic range. The 200 ksps sample rate allows comfortable 44.1 kHz audio-band sampling for waveform visualization without aliasing. Multiple MCP3008 channels can be stacked for stereo or multi-channel level metering; using pseudo-differential mode improves common-mode rejection of single-supply rail noise in the audio chain.
Được đề xuất
Low-Cost Instrumentation / Lab Equipment
University labs and small OEMs use the MCP3008-I/SL as the digitizer in low-cost bench instruments such as bench multimeters, semiconductor curve tracers, and physics-sensor readouts, where 10-bit resolution is acceptable for educational purposes and the SOIC-16 package is hand-solderable. The internal VREF allows one-chip designs without external reference components, and the SPI interface streams directly to a host PC over USB-UART bridges. The -40 °C to +85 °C industrial range covers typical lab and outdoor field environments without derating.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MCP3008-I/SL — 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 | MCP3008T-I/SL | MCP3008T-I/SLVAO | MCP3208-CI/SL | MCP3208-BI/SL | MCP3004-I/SL |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-16 (SL) | SOIC-16 (SL) - same | SOIC-16 (SL) - same | SOIC-16 (SL) - same | SOIC-16 (SL) - same | SOIC-14 (SL) - 2 fewer pins |
| Resolution | 10 bit | 10 bit | 10 bit | 12 bit | 12 bit | 10 bit |
| Input Channels | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 4 single-ended / 2 pseudo-diff |
| Max Throughput @ 5 V | 200 ksps | 200 ksps | 200 ksps | 100 ksps (-50%) | 100 ksps (-50%) | 200 ksps |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (Q100) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Automotive Grade (AEC-Q100) | Not qualified | Not qualified | Yes (AEC-Q100) | Not qualified | Not qualified | Not qualified |
| Interface | SPI (mode 0,0 / 1,1) | SPI (same) | SPI (same) | SPI (same) | SPI (same) | SPI (same) |
Bảo phân biệt quan trọng
- Lowest-cost 8-channel SAR ADC in standard SOIC-16 footprint (vsMCP3208-CI/SL)
- Automotive-grade drop-in option exists with same SOIC-16 footprint (vsMCP3008T-I/SLVAO)
- Tape-and-reel variant is a true drop-in, not just a packaging code (vsMCP3008T-I/SL)
- SPI interface simple enough to bit-bang from any MCU GPIO (vsADS7950SDBTR (TI))
Ghi chú thiết kế
Estimated: At 5 V VDD with continuous 200 ksps sampling across 8 channels, the MCP3008 draws roughly 320 µA from VDD - negligible for most designs but worth budgeting in battery-powered logger applications. Decouple VDD with a 100 nF ceramic placed within 3 mm of pin 16 plus a bulk 10 µF tantalum at the regulator output. Tie AGND (pin 14) and DGND (pin 9) to a single ground star directly under the IC to avoid ground-loop noise coupling into the SAR comparator.
Keep analog input traces short and guarded with a ground trace on each side to limit digital crosstalk into the sample-and-hold. Route SPI traces (CS, Din, Dout, CLK) away from the analog inputs by at least 5 mm, and place the 100 nF VDD decoupling cap on the same layer as the IC. Estimated: per Microchip datasheet section 6.0, the analog input bandwidth exceeds 1 MHz, so any high-impedance trace longer than 25 mm should be treated as a transmission line if you sample above 50 ksps.
The MCP3008's sample-and-hold acquires the input in roughly 1.5 SPI-clock periods, so settle the analog source within 1.5 clock periods at your chosen SCLK for full 10-bit accuracy. With high-impedance sources (>10 kΩ) add an external 100 pF-1 nF buffer cap directly at the channel pin. Pseudo-differential mode (CHx vs CHx+1, GND=CH(x%2)) doubles effective common-mode rejection but reduces channel count from 8 to 4 - useful when the analog signals share a common DC bias.
Do not drive any analog input above VDD + 0.3 V or below AGND - 0.3 V - the absolute-maximum ratings in the datasheet allow only a small overdrive beyond the rails before latch-up. With 3.3 V sensors and a 5 V VDD supply, add a series 1 kΩ resistor at each input to limit fault current if the input is mis-wired. Do not float CS - leaving CS high puts the chip in shutdown (5 nA) but a noisy floating line can spuriously enable conversion.
Thông tin tuân thủ
RoHS compliant per Microchip product page; the automotive-qualified MCP3008T-I/SLVAO variant carries AEC-Q100 Grade 1 qualification - choose VAO suffix for automotive designs
