MCP3208-CI/SL - 12-Bit 8-Ch SAR ADC, SPI, SOIC-16 | Microchip
Teilenummer: MCP3208-CI/SL ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.1 | $31,00 |
| 100 | $2.62 | $262,00 |
| 500 | $2.3 | $1.150,00 |
| 1.000 | $2.05 | $2.050,00 |
MCP3208-CI/SL Übersicht
An analog-to-digital converter is a mixed-signal integrated circuit that converts a continuous-time, continuous-amplitude voltage on its input pin into a discrete digital code at its output. SAR ADCs in particular use a binary-search algorithm with an internal sample-and-hold and capacitive DAC to converge on the input voltage in N conversion cycles (N = number of bits). SAR converters sit within the broader ADC family alongside delta-sigma (high-resolution, low-speed) and pipeline ADCs (very-high-speed, multi-Msps), and are favored for low-latency, moderate-resolution sampling in embedded systems where determinism and simple serial interfacing matter more than ultimate resolution.
Key features include ±1 LSB maximum DNL, ±1 LSB maximum INL, low power consumption of 5 nA standby current and 0.5 mA typical active current at 5V, and an industrial-grade operating temperature range of -40 C to +85 C. The SPI interface uses a standard 4-wire arrangement (CS, DIN, DOUT, CLK), is compatible with 8-bit serial protocols, and supports daisy-chaining of multiple devices on the same bus.
The device combines a track-and-hold input stage with a successive-approximation core and on-chip clock. The pseudo-differential input mode provides improved common-mode rejection for bridge sensors and thermocouple interfaces, while single-ended mode maximizes channel count for general-purpose monitoring of 8 separate analog signals.
Typical applications include factory automation sensor multiplexing, battery monitoring in portable instruments, data acquisition front-ends for HVAC controllers, and robotics joint position sensing. The SOIC-16 wide-body package simplifies hand-prototyping and is widely accepted by contract assemblers.
When designing with the MCP3208, ensure VDD is well-decoupled with a 1 uF ceramic capacitor placed within 5 mm of the AVDD pin, and that the analog input source impedance stays below 1 kohm to avoid converter gain errors. Note that -CI versions are specified over -40 C to +85 C, while -BI versions extend to -40 C to +125 C.
This page synthesizes real-time distributor pricing, drop-in alternatives from the same Microchip SAR ADC family, and application notes not collated in the standalone datasheet, helping you evaluate whether MCP3208-CI/SL is the right ADC for your 8-channel embedded design.
Drop-in-Alternativen für MCP3208-CI/SL – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MCP3208T-CI/SL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP3208T-BI/SL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP3208-BI/SL
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MCP3204-CI/SL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP3208-CI/SL Grenzwerte & elektrische Eigenschaften
| Auflösung | 12 bits |
| Number of Input Channels | 8 (single-ended) / 4 (pseudo-differential) |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 100 ksps |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Analog Input Voltage Range | 0 V to VREF (single-ended) |
| DNL (Differential Non-Linearity) | ±1 LSB (max) |
| INL (Integral Non-Linearity) | ±1 LSB (max) |
| Active Supply Current | 0.5 mA typical at 5V / 0.4 mA at 3V |
| Standby Supply Current | 5 nA typical |
| Digital Interface | SPI (Mode 0,0 and Mode 1,1 compatible) |
| Betriebstemperaturbereich | -40 C to +85 C (Industrial, -CI grade) |
| Gehäuse | 16-SOIC (3.90 mm wide, SL suffix) |
| Montageart | Surface Mount |
| MSL (Moisture Sensitivity Level) | MSL-1 |
| RoHS Compliance | Compliant |
MCP3208-CI/SL Pin-Konfiguration
| Pin 1 | CH0 — Analog input channel 0 |
| Pin 2 | CH1 — Analog input channel 1 |
| Pin 3 | CH2 — Analog input channel 2 |
| Pin 4 | CH3 — Analog input channel 3 |
| Pin 5 | CH4 — Analog input channel 4 |
| Pin 6 | CH5 — Analog input channel 5 |
| Pin 7 | CH6 — Analog input channel 6 |
| Pin 8 | CH7 — Analog input channel 7 |
| Pin 9 | DGND — Digital ground |
| Pin 10 | CS/SHDN — Chip select / shutdown (active low) |
| Pin 11 | DIN — SPI serial data input |
| Pin 12 | DOUT — SPI serial data output |
| Pin 13 | CLK — SPI serial clock |
| Pin 14 | AGND — Analog ground |
| Pin 15 | VREF — Voltage reference input |
| Pin 16 | VDD — Positive power supply (2.7V to 5.5V) |
Typische Anwendungen
MCP3208-CI/SL ist geeignet für 7 Anwendungs: Industrial Sensor Multiplexing & Data Acquisition, Battery Monitoring & Fuel Gauge Front-End, HVAC Control & Thermostat Readout, Robotics & Multi-Axis Position Sensing, Audio Level Metering & Studio Equipment, Maker & Educational Electronics (Raspberry Pi / Arduino), Medical Patient Monitoring Equipment (Non-Critical).
Industrial Sensor Multiplexing & Data Acquisition
Why MCP3208-CI/SL fits: The 8 single-ended input channels and 100 ksps throughput allow one ADC to monitor an entire sensor array - thermocouples, RTDs, pressure transducers, and 4-20 mA loop outputs - without external analog muxes. Application note circuit: place a 10 kohm/10 nF RC filter on each input pin to limit bandwidth to ~1.6 kHz and reject motor/relay EMI. Pseudo-differential mode (4 channels) provides common-mode rejection up to 80 dB for bridge sensors. Performance trade-off: 12-bit resolution gives 1 mV LSB at 4.096V full scale - adequate for 0.1% sensor readouts but not for strain-gauge precision.
Empfohlen
Battery Monitoring & Fuel Gauge Front-End
Why MCP3208-CI/SL fits: With 8 channels and 2.7V-5.5V supply, the ADC runs directly from a 3.3V rail and can monitor 4-cell battery stacks (4 channels for cell voltages plus 4 for temperature sensors or load current). The 5 nA standby current is negligible compared to battery self-discharge. Circuit: connect each cell via a 100 kohm/100 kohm resistor divider to an analog channel, then use the on-chip sample-and-hold to capture synchronized readings before the charger switches. Trade-off: 100 ksps is overkill for battery monitoring at 1 Hz - use lower clock rates to drop quiescent current to ~50 uA.
Empfohlen
HVAC Control & Thermostat Readout
Why MCP3208-CI/SL fits: HVAC thermostats typically need 4-8 analog inputs (indoor temp, outdoor temp, humidity sensor, setpoint potentiometer, supply rail monitor). The 8-channel single-ended mode satisfies this in one ADC, leaving microcontroller ADC pins free for digital I/O. Circuit: 100 nF X7R bypass + 10 kohm input resistors, sample at 100 Hz per channel - well within the 100 ksps limit. Trade-off: SOIC-16 wide-body package fits standard thermostat PCBs without requiring reflow profile changes versus MSOP alternatives.
Empfohlen
Robotics & Multi-Axis Position Sensing
Why MCP3208-CI/SL fits: Robotics joints use potentiometers, Hall sensors, or rotary encoders that output analog voltages for position feedback. With 8 channels, one MCP3208 can monitor a 6-DOF robot arm plus two gripper sensors. Sample rate of 100 ksps supports control loops up to 1 kHz per channel. Circuit: buffer each input with an MCP6001 to avoid loading the sensor, then daisy-chain two MCP3208s via SPI CS to expand to 16 channels. Trade-off: use the pseudo-differential mode for motors where ground bounce is present; this rejects common-mode noise up to the supply rail.
Empfohlen
Audio Level Metering & Studio Equipment
Why MCP3208-CI/SL fits: 12-bit resolution (72 dB dynamic range) is sufficient for VU meter displays and simple audio level monitoring in PA systems. The 100 ksps sample rate easily captures audio bandwidth (20 Hz-20 kHz at 44.1 ksps). Circuit: AC-couple input via 10 uF capacitor + 100 kohm/100 kohm divider to scale 2 V RMS audio into 0-VREF range, then sample at 8 ksps per channel. Trade-off: 12 bits yields only 1.6 mV LSB - adequate for level metering but not for high-fidelity audio capture (use delta-sigma ADCs like MCP3421 for 16-18 bit audio).
Empfohlen
Maker & Educational Electronics (Raspberry Pi / Arduino)
Why MCP3208-CI/SL fits: RPi and Arduino boards need ADC channels for analog sensors but lack enough built-in ADC pins (RPi: 0; Arduino Uno: 6). The MCP3208 adds 8 channels via SPI at under $3 per board. Circuit: SOIC-16 breakout with 0.1 uF VDD bypass, connect to host via SPI bus, run py-spidev (RPi) or SPI library (Arduino). Trade-off: SOIC-16 wide-body is breadboard-friendly but requires breakout boards; consider MSOP-10 alternatives for solder-on-breadboard designs. Community libraries (Adafruit, SparkFun) make integration trivial.
Empfohlen
Medical Patient Monitoring Equipment (Non-Critical)
Why MCP3208-CI/SL fits: For non-critical vital-sign monitoring equipment (fitness monitors, sleep trackers, basic pulse oximeters), the 12-bit resolution and 8-channel capability consolidate sensor readout. Circuit: connect pulse-oximeter photodiode signals via transimpedance amplifier (MCP6001) to ADC channels, sample at 100 Hz per channel. Trade-off: For FDA-cleared medical devices, the -BI extended-temp variant and additional IEC 60601-1 compliance documentation may be needed; -CI grade parts are appropriate for fitness/wellness devices only.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MCP3208-CI/SL – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MCP3208T-CI/SL | MCP3208T-BI/SL | MCP3208-BI/SL | MCP3204-CI/SL |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-16 (SL, tube) | SOIC-16 (SL, tape-and-reel) - same footprint | SOIC-16 (SL, tape-and-reel) - same footprint | SOIC-16 (SL, tube) - same footprint | SOIC-16 (SL, tube) - same footprint |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 8 (single-ended) / 4 (pseudo-differential) | 8 / 4 | 8 / 4 | 8 / 4 | 4 / 2 |
| Sample Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Operating Temperature | -40 C to +85 C (Industrial -CI) | -40 C to +85 C (-CI) | -40 C to +125 C (-BI extended) | -40 C to +125 C (-BI extended) | -40 C to +85 C (-CI) |
| Packaging | Tube | Tape & Reel | Tape & Reel | Tube | Tube |
Wichtigste Unterscheidungsmerkmale
- True 8-channel SAR ADC in single SOIC-16 package (vs. MCP3204-CI/SL)
- Industrial temperature grade for cost-sensitive non-automotive designs (vs. MCP3208T-BI/SL)
- Mature, broadly supported SPI protocol versus I2C or proprietary (vs. Other 8-channel ADCs using I2C)
- Single 2.7V-5.5V supply eliminates need for level shifters (vs. Higher-voltage ADCs requiring +/-15V rails)
Designhinweise
Place a 1 uF X7R ceramic bypass capacitor within 5 mm of the VDD pin (pin 16) with a low-impedance trace to ground; add a 100 nF in parallel for high-frequency noise. If using a separate analog VDD rail, insert a ferrite bead between digital VDD and analog VDD to prevent digital switching noise coupling into the analog inputs. A clean VREF reference (e.g., MCP1541 4.096V) is critical - any VREF noise directly couples to conversion accuracy. The 5 nA standby current is negligible but the active 0.5 mA must be budgeted in battery-powered designs.
Route the SPI bus traces (CS, CLK, DIN, DOUT) as short, parallel-length matched traces (5-10 cm max) to avoid reflections at 2 MHz SPI clock. Keep analog input traces away from the SPI clock edge to minimize capacitive coupling. For pseudo-differential mode, route the IN- traces in parallel with IN+ traces with equal length to maintain common-mode rejection. The SOIC-16 thermal pad is not present - ground thermal dissipation via the GND pins (9 and 14) with a pour on both layers connected by thermal vias.
Do not source-impedance load analog inputs - the MCP3208 acquisition time assumes source impedance under 1 kohm; higher impedance causes gain errors and DNL degradation. Apply the correct SPI mode - the device accepts both Mode 0,0 and Mode 1,1 but verify your host MCU configuration. The CS pin must return high between conversions to start a new sample-and-hold cycle; holding CS low continuously will not start a new conversion. Finally, do not drive VREF above VDD - this causes permanent device damage.
Compliance-Informationen
RoHS compliant per Microchip product page; not AEC-Q100 qualified (use MCP3208T-BI/SL for extended-temp designs; AEC-Q100 qualifiers not present in Microchip's automotive-grade portfolio for this specific part). REACH compliant per EU regulations. Lead-free and halogen-free per Microchip environmental certification.
