MAX182BCWI - 12-Bit 4-Ch 17ksps ADC with T/H & Reference | Maxim
Référence : MAX182BCWI ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.95 | $1 395,00 |
| 500 | $11.4 | $5 700,00 |
| 1 000 | $9.85 | $9 850,00 |
MAX182BCWI Présentation
An ADC (Analog-to-Digital Converter) is a data-acquisition component that translates real-world continuous analog signals into discrete digital codes readable by a microcontroller, DSP, or processor. In the broader signal-chain hierarchy, the ADC sits between analog front-end conditioning (amplifiers, multiplexers, sensors) and digital processing; multi-channel ADCs like the MAX182 integrate channel switching, sample-and-hold, and reference, replacing a discrete implementation that would otherwise require a separate MUX, T/H, and reference IC. The MAX182 series uses successive-approximation register (SAR) architecture, which provides deterministic latency per conversion ideal for multiplexed data-acquisition systems.
Key features include 17 ksps throughput, a 4.096V internal reference, software-configurable input ranges, on-chip calibration, a track-and-hold amplifier, and a parallel microprocessor interface. The integrated 4.096V reference simplifies analog input scaling for 0-5V or +/-5V ranges by providing 1 LSB = 1 mV resolution when the inputs are configured for unity-gain operation.
Typical applications include industrial process-control data-acquisition systems, multi-loop programmable logic controllers (PLCs), analog I/O cards for PC-based measurement, and precision sensor signal digitisation. Designers select the MAX182 for its combination of integrated reference, multi-channel switching, and parallel interface that simplifies firmware handshaking.
When designing with the MAX182BCWI, carefully review the input-channel protection and reference-bypass capacitor selection for noise immunity. Connect AGND and DGND with a low-impedance star ground near the IC, and add a 10 uF tantalum plus 0.1 uF ceramic bypass capacitor directly on the REF pin.
This page synthesises distributor availability, drop-in pin-compatible alternatives, and practical PCB design guidance for the MAX182BCWI that are not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour MAX182BCWI — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MAX182BCWI (même facteur de forme et même empreinte) — différant par Data Interface, Internal Reference, Resolution, Sampling Rate.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX182BCWI+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX182AEWI+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX182BEWI+
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MAX182ACWI+
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MAX165BCWN
✅ Remplacement direct✓ En stock
$12.4 / unité
Voir la fiche technique →MAX1300CMB+
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MAX182BCWI Valeurs maximales et caractéristiques électriques
| Résolution | 12 bits |
| Number of Input Channels | 4 single-ended / 2 differential |
| Conversion Architecture | Successive Approximation (SAR) |
| Fréquence d'échantillonnage | 17 ksps |
| Input Voltage Ranges | 0 to +5V / 0 to +10V / +/-5V / +/-10V (software-configurable) |
| Data Interface | Parallel (8-bit bus) |
| Internal Reference | 4.096 V |
| Track-and-Hold | Integrated |
| On-Chip Calibration | Yes |
| Boîtier / Format | 28-SOIC (wide body, 0.300") |
| Type de montage | Surface Mount |
Configuration des broches de MAX182BCWI
| Broche 1 | CH0 — Analog input channel 0 |
| Broche 2 | CH1 — Analog input channel 1 |
| Broche 3 | CH2 — Analog input channel 2 |
| Broche 4 | CH3 — Analog input channel 3 |
| Broche 5 | AGND — Analog ground |
| Broche 6 | REF — 4.096 V internal reference output / external reference input |
| Broche 7 | REFADJ — Reference adjust input for calibration |
| Broche 8 | VDD — +5 V (or +12V tolerant) analog supply |
| Broche 9 | VSS — Negative supply input (e.g., -12V or -5V for bipolar ranges) |
| Broche 10 | VEE — -5V charge-pump ground reference |
| Broche 11 | DGND — Digital ground |
| Broche 12 | D0 — Data bit 0 (LSB) |
| Broche 13 | D1 — Data bit 1 |
| Broche 14 | D2 — Data bit 2 |
| Broche 15 | D3 — Data bit 3 |
| Broche 16 | D4 — Data bit 4 |
| Broche 17 | D5 — Data bit 5 |
| Broche 18 | D6 — Data bit 6 |
| Broche 19 | D7 — Data bit 7 (MSB) |
| Broche 20 | INT — Interrupt / end-of-conversion output |
| Broche 21 | MODE — Mode select |
| Broche 22 | WR — Write strobe for control register |
| Broche 23 | RD — Read strobe |
| Broche 24 | CS — Chip select (active low) |
| Broche 25 | CAL — Calibration control |
| Broche 26 | CLK — External clock input |
| Broche 27 | RESET — Reset input (active low) |
| Broche 28 | NC — Not connected (per datasheet) |
Applications typiques
MAX182BCWI convient pour 6 applications: Industrial Process Control / PLC Analog Input Modules, PC-Based Data Acquisition Cards (DAQ), Precision Sensor Signal Digitisation, Medical Monitoring & Diagnostic Equipment, Automotive Sensor Interface Modules, Battery-Powered Test & Measurement Instrumentation.
Industrial Process Control / PLC Analog Input Modules
The MAX182BCWI's four single-ended input channels and software-configurable +/-10V / 0-10V / +/-5V / 0-5V ranges make it a natural fit for industrial process-control I/O modules reading 4-20 mA-derived voltage signals, thermocouple-conditioned millivolts, and 0-10V valve-actuator feedback. Its 17 ksps throughput exceeds the typical PLC scan requirement of 1-10 ksps, leaving margin for time-multiplexing multiple channels. The on-chip 4.096V reference plus software calibration let designers hit 0.1% FSR gain accuracy after a single-room-temperature trim, and the wide-body 28-SOIC package has the creepage and clearance margins often required for industrial modules up to 24V common-mode.
Recommandé
PC-Based Data Acquisition Cards (DAQ)
The MAX182BCWI's parallel 8-bit data interface allows direct connection to ISA, PC/104, and modern FPGA-soft-core bus implementations on PC-based DAQ cards without glue logic. The integrated track-and-hold and four-channel multiplexer remove the need for separate MUX and T/H ICs on the analog front end, reducing board area to roughly half that of discrete designs. At 17 ksps aggregate the part suits medium-speed vibration, strain-gauge, and temperature logging boards, and the on-chip 4.096V reference lets each channel scale directly to engineering units in mV/LSB. Designers pair it with precision op-amp buffers to drive its input at full speed.
Recommandé
Precision Sensor Signal Digitisation
For precision sensor signal digitisation such as load cells, pressure transducers, and strain gauges, the MAX182BCWI offers 12-bit resolution and software calibration that improve effective accuracy beyond the raw 1-LSB quantisation by trimming offset and gain in firmware. The internal 4.096V reference scales directly to engineering units (1 mV/LSB at 0-4.096V full-scale, with the 0-5V range giving 1.22 mV/LSB) and the bipolar +/-5V / +/-10V ranges accommodate bipolar sensor outputs without external level shifting. Designers use the on-chip calibration register to compensate for sensor offset at production and the track-and-hold to acquire fast-changing transducer signals without aperture-time errors.
Recommandé
Medical Monitoring & Diagnostic Equipment
In medical monitoring equipment such as bedside patient monitors and physiological-data acquisition front ends, the MAX182BCWI's low-noise integrated architecture and DC-stable calibration suit ECG, EEG, and respiration channels that need 12-bit dynamic range sampled at rates aligned with the 17 ksps throughput. The integrated reference eliminates a separate noisy LDO from the signal path and the four-channel mux allows simultaneous digitisation of multiple electrode pairs with deterministic SAR latency. Hospital-grade isolation barriers pair naturally with the part's wide-body 28-SOIC, which provides the creepage margins required for patient-applied circuits in IEC 60601-1 designs.
Recommandé
Automotive Sensor Interface Modules
The MAX182BCWI's wide input ranges and 28-SOIC footprint make it well suited to non-safety automotive sensor interface modules reading engine, chassis, or HVAC signals such as MAP sensors, oil-quality probes, and cabin climate transducers. Its 12-bit resolution and software calibration track sensor drift across the -40C to +85C automotive temperature range, and the 17 ksps throughput accommodates 1 ms update loops used in engine management. Although the bare MAX182BCWI is not AEC-Q100 qualified, the pin-compatible MAX182AEWI+ (industrial grade) and software-compatible MAX1300 series provide automotive-grade options in the same PCB footprint.
Recommandé
Battery-Powered Test & Measurement Instrumentation
Bench-top multimeters, portable calibrators, and battery-powered test gear benefit from the MAX182BCWI's combination of integrated signal chain (T/H, MUX, reference), 12-bit resolution, and 17 ksps sampling for measuring transducer and circuit signals. The integrated 4.096V reference simplifies its use as a portable voltage standard with 1 mV/LSB resolution, and the bipolar ranges let handheld units measure both DC polarity signals without relay switching. The wide-body 28-SOIC pins also accept hand-soldered rework on test prototypes, and the on-chip calibration allows field-trim against an external standard to maintain long-term accuracy.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX182BCWI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX182BCWI+ | MAX182AEWI+ | MAX182BEWI+ | MAX165BCWN |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SOIC (wide, 0.300") | 28-SOIC (wide, 0.300") - same | 28-SOIC (wide, 0.300") - same | 28-SOIC (wide, 0.300") - same | SOIC-28 (wide) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Input Channels | 4 single-ended / 2 differential | 4 / 2 | 4 / 2 | 4 / 2 | 8 / 4 |
| Sampling Rate | 17 ksps | 17 ksps | 17 ksps | 17 ksps | 12 ksps |
| Internal Reference | 4.096 V internal | 4.096 V internal | 4.096 V internal | 4.096 V internal | 4.096 V internal |
| Input Voltage Range | 0-5V / 0-10V / +/-5V / +/-10V | same | same | same | similar bipolar/unipolar ranges |
| Linearity / Speed Grade | B-grade (standard linearity, standard speed) | B-grade | A-grade (tighter linearity) | B-grade | B-grade |
Principaux différenciateurs
- Integrated 4.096V reference avoids external reference IC on the BOM (vs Discretes (separate MUX + T/H + ADR01 reference))
- Wide input range flexibility in a single part (vs MAX135CWI (single-range 0-5V ADC))
- On-chip calibration register trims offset and gain at production (vs MAX165BCWN (no calibration register))
Notes de conception
Bypass VDD and REF pins separately. Place a 10 uF tantalum (or low-ESR ceramic) cap and a 0.1 uF ceramic cap in parallel as close as possible to the IC on each supply pin; this prevents digital switching noise from corrupting the analog reference ladder. Estimated: with 17 ksps throughput and a 5V supply, the part draws a few mA quiescent but the converter slewing can produce fast current transients on VDD - bulk decoupling of at least 10 uF is mandatory.
Use a split ground plane with a single star connection between AGND and DGND located right at the IC. Route all digital signals (D0-D7, RD, WR, CS, INT, CLK, RESET) over the digital side, and keep analog input traces (CH0-CH3, REF) short and direct on the analog side. The 28-SOIC wide-body package's pin spacing makes this layout straightforward - leave at least 3 mm of analog-side copper pour as a guard ring around the analog pins to minimise digital crosstalk.
Do not omit the REFADJ capacitor network - it sets the reference fine-trim and omitting it causes gain error. Likewise, never drive an analog input channel outside its selected range (e.g. 0-5V input when in +/-10V range mode) - this can saturate the input multiplexer. The on-chip calibration register should be exercised at production (write CAL=1 then read the cal result) - skipping this leaves the part with uncorrected offset/gain error that drifts over temperature.
Drive analog inputs with a low-impedance buffer (op-amp with < 100 ohm output impedance at the input bandwidth) to avoid conversion errors caused by the ADC's input switching transients. Estimated: at 17 ksps with 5V full-scale, the part's input presents a switched-capacitor load of a few pF that requires ~1 kohm source impedance or less for full accuracy; a series 20 ohm resistor between op-amp output and the ADC pin improves stability without degrading accuracy.
Informations de conformité
The base MAX182BCWI uses legacy lead finish (no '+' suffix); it is not RoHS-compliant. Use the MAX182BCWI+ variant (or higher grades MAX182AEWI+ / MAX182BEWI+) for RoHS-compliant designs. Automotive-grade qualification not available in this family.
