MAX174BCWI+ - 12-Bit 125 kSPS Complete ADC | Maxim Integrated
Référence : MAX174BCWI+ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $26.1 | $261,00 |
| 100 | $23.4 | $2 340,00 |
| 500 | $20.85 | $10 425,00 |
| 1 000 | $18.65 | $18 650,00 |
MAX174BCWI+ Présentation
Key specifications include 12-bit resolution with no missing codes, a 0 V to +10 V or 0 V to +20 V input range (jumper or strap selectable), a 10 V on-chip buried-zener reference (TrimDAC-compatible, ±0.3% accuracy grade B), a parallel microprocessor interface, and a low supply requirement of +5 V plus optionally ±12 V to ±15 V for analog inputs. Conversion time is 8 µs at full throughput, with three interface modes for tying to 8-bit, 12-bit, or 16-bit data buses.
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a widely used ADC architecture that uses a binary search algorithm to resolve the input voltage one bit per clock cycle, achieving an excellent trade-off between speed, resolution, and power consumption. SAR ADCs sit at the second tier of the data-converter hierarchy: faster than integrating ADCs, slower than flash or pipeline ADCs, but offering very high DC accuracy and low latency. They occupy a key role in the broader power management and signal-conditioning IC family, alongside DACs, references, and multiplexers.
The MAX174BCWI+ uses Maxim's BiCMOS construction, which reduces power dissipation relative to older bipolar-only designs. The internal reference and clock reduce external component count to a bare minimum: a handful of bypass capacitors and decoupling at the supply pins are sufficient for most applications. The device can also be operated in ROM mode for reduced-microcontroller designs.
Typical applications include process-control data acquisition boards, instrumentation front-ends, motor-control feedback loops, medical monitoring equipment, and any high-accuracy industrial measurement requiring an easy-to-interface 12-bit ADC with built-in reference. The wide analog input range (up to ±10 V bipolar) makes the part especially attractive in legacy industrial systems that use ±10 V or 4 mA to 20 mA signaling. Pairing the MAX174BCWI+ with a precision op-amp front-end (such as the MAX4250) and an instrumentation amp (such as the MAX4194) builds a complete 12-bit analog input module.
When designing with the MAX174BCWI+, observe the Analog Devices datasheet supply-decoupling recommendation: place 10 µF tantalum and 0.1 µF ceramic bypass capacitors as close to the supply pins as possible. Re-calibrate the internal reference at first startup using the TrimDAC inputs if ±1 LSB absolute accuracy is required, especially at the limits of the operating temperature range.
This page synthesizes distributor pricing, drop-in same-brand alternatives, and practical design notes that complement the manufacturer datasheet - ideal for engineers evaluating the MAX174BCWI+ for new designs or as a drop-in for an end-of-life replacement in an existing board.
Alternatives de remplacement direct pour MAX174BCWI+ — 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 MAX174BCWI+ (même facteur de forme et même empreinte) — différant par Resolution, Package, Architecture, Mounting Type, Terminal Form.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX174ACWI+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX174BCWI
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX174BCWI+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX173CWG
✅ Remplacement direct✓ En stock
$8.95 / unité
Voir la fiche technique →MAX162BCNG+
✅ Remplacement direct✓ En stock
$7.5 / unité
Voir la fiche technique →MAX174BCWI+ Valeurs maximales et caractéristiques électriques
| Résolution | 12 bits |
| Fréquence d'échantillonnage | 125 kSPS |
| Conversion Time | 8 µs |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Plage de tension d'entrée | 0 V to +10 V or 0 V to +20 V (unipolar); ±5 V or ±10 V (bipolar) |
| Internal Reference | 10 V buried zener, ±0.3 % (grade B) |
| Interface | Parallel (8/12/16-bit bus compatible) |
| Supply Voltage (Digital) | +5 V |
| Supply Voltage (Analog) | ±12 V to ±15 V (bipolar operation) |
| Integral Nonlinearity | ±1 LSB max (grade B) |
| Differential Nonlinearity | ±1 LSB max (no missing codes) |
| Température de fonctionnement | 0 °C to +70 °C |
| Boîtier | 28-pin SOIC (wide, 7.5 mm body width) |
| Type de montage | Surface Mount |
Configuration des broches de MAX174BCWI+
| Broche 1 | DB11 — Data bit 11 (MSB) - parallel output |
| Broche 2 | DB10 — Data bit 10 - parallel output |
| Broche 3 | DB9 — Data bit 9 - parallel output |
| Broche 4 | DB8 — Data bit 8 - parallel output |
| Broche 5 | DB7 — Data bit 7 - parallel output |
| Broche 6 | DB6 — Data bit 6 - parallel output |
| Broche 7 | DB5 — Data bit 5 - parallel output |
| Broche 8 | DB4 — Data bit 4 - parallel output |
| Broche 9 | DB3 — Data bit 3 - parallel output |
| Broche 10 | DB2 — Data bit 2 - parallel output |
| Broche 11 | DB1 — Data bit 1 - parallel output |
| Broche 12 | DB0 — Data bit 0 (LSB) - parallel output |
| Broche 13 | STATUS — End-of-conversion status flag |
| Broche 14 | /CS — Chip select, active low |
| Broche 15 | /RD — Read strobe, active low |
| Broche 16 | DGND — Digital ground |
| Broche 17 | DVDD — +5 V digital supply |
| Broche 18 | REF — +10 V reference output / input (TrimDAC) |
| Broche 19 | REFIN — Reference input (TrimDAC adjustment node) |
| Broche 20 | AGND — Analog ground |
| Broche 21 | +VCC — +15 V analog supply (positive rail for bipolar inputs) |
| Broche 22 | -VCC — -15 V analog supply (negative rail for bipolar inputs) |
| Broche 23 | AIN — Analog input (unipolar 0-10 V / 0-20 V or bipolar ±5 V / ±10 V) |
| Broche 24 | RANGE — Input range select (input current 0.2 mA) |
| Broche 25 | BIP — Bipolar mode select (offset adjustment) |
| Broche 26 | CAL — Calibration mode select |
| Broche 27 | BPOFF — Bipolar offset adjustment pin |
| Broche 28 | TRIM — Reference trim (TrimDAC) |
Applications typiques
MAX174BCWI+ convient pour 6 applications: Process Control Data Acquisition, Industrial Instrumentation Front-End, Motor Control Feedback, Medical Monitoring Equipment, Test and Measurement Equipment, Legacy Industrial Bus Digitizers.
Process Control Data Acquisition
The MAX174BCWI+ suits multi-channel process-control front-ends where 12-bit resolution at 125 kSPS is sufficient and a wide bipolar input range is mandatory. Its 0 V to +10 V and ±10 V input ranges cover 4-20 mA current-loop receivers (with a 100 Ω shunt) and ±10 V industrial transducers without external signal conditioning. The on-chip 10 V buried-zener reference removes the need for an external precision reference, cutting BOM cost by ~$2 per ADC channel. Place 10 µF tantalum plus 0.1 µF ceramic bypass capacitors at each supply pin to keep conversion noise below 1 LSB. Compared with newer SAR ADCs the MAX174BCWI+ offers a familiar digital interface that drops straight into 8051-style legacy controllers.
Recommandé
Industrial Instrumentation Front-End
Industrial instrumentation subsystems benefit from the MAX174BCWI+'s true-bipolar ±10 V input range, which lets a single ADC digitize both unipolar 0-10 V sensor outputs and bipolar ±10 V signals from strain gauges and load cells without external level shifting. The parallel 8/12/16-bit interface is a clean fit for legacy microcontrollers and bus arbiters, and the on-board 10 V reference with ±0.3 % accuracy helps the overall system meet ±1 LSB at full scale without external trimming. In typical rack-mount instrumentation this ADC sits behind a low-noise op-amp buffer and feeds a 12-bit parallel bus to a host processor; the conversion-time penalty (~8 µs) is acceptable for 10 kHz update rate applications like temperature control loops.
Recommandé
Motor Control Feedback
Brushless-DC and industrial servo drives use the MAX174BCWI+ in position/velocity feedback loops where 12-bit resolution and 125 kSPS throughput give sub-millisecond loop update rates. The chip's +5 V digital supply matches typical microcontrollers, while the ±15 V analog supply lets the ADC directly digitize current-sense signals from shunt resistors amplified to a ±10 V range. The STATUS pin provides an end-of-conversion flag for synchronizing control-loop computation with sampling, ensuring deterministic timing. Track-and-hold behavior on the input makes the ADC tolerant of high-dV/dt PWM edges typical in 3-phase inverter modules.
Recommandé
Medical Monitoring Equipment
Patient monitoring devices use the MAX174BCWI+ to digitize analog signals from ECG, pulse-oximeter, and temperature sensors where 12-bit resolution and the ±10 V input range suffice for moderate-amplitude physiological signals. The internal buried-zener reference and well-defined INL/DNL figures aid IEC 60601-1 compliance testing because gain drift stays within ±1 LSB across the commercial operating range. The parallel interface simplifies integration with medically certified microcontrollers and CPLDs, reducing firmware complexity. Layout should keep digital switching currents away from the analog input traces to maintain CMRR above 80 dB.
Recommandé
Test and Measurement Equipment
Bench-top DMMs, dataloggers, and laboratory instruments often use the MAX174BCWI+ as the main DC measurement ADC thanks to its no-missing-codes 12-bit performance and on-board 10 V reference. Engineers repurposing the part for multimeter-grade inputs pair it with a precision input divider and front-end protection clamp, achieving 0.025 % DC accuracy on the 10 V range. Multiple chips can be paralleled with chip-select multiplexing to build a low-cost multi-channel data acquisition module where each channel is software-accessible via a parallel bus. The commercial temperature range (0 °C to +70 °C) suits lab and light-industrial environments.
Recommandé
Legacy Industrial Bus Digitizers
Many legacy 4 mA-to-20 mA current-loop and ±10 V analog-bus industrial networks persist in factory automation, where designers retrofit the MAX174BCWI+ to digitize a 4-20 mA signal with a 100 Ω shunt and feed it to a modern microcontroller or bus transceiver. The wide ±10 V input range handles +/- 10 V signaling without external protection, and the 8 µs conversion time provides ample throughput for 100 Hz digital-loop update rates typical in process control. The 28-pin SOIC wide-body package is hand-solderable for low-volume retrofit manufacturing, helping maintenance engineers build replacement boards without specialized fine-pitch equipment.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX174BCWI+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX174ACWI+ | MAX174BCWI | MAX174BCWI+T | MAX173CWG | MAX162BCNG+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SOIC (wide) | 28-SOIC (wide) - same | 28-SOIC (wide) - same | 28-SOIC (wide) - same | 28-SOIC (wide) - same | 28-SOIC - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C |
Principaux différenciateurs
- Trade-off - internal reference reduces BOM but is only ±0.3 % accurate (vs MAX174ACWI+)
- RoHS finish is a lead-free finish verified at distributors (vs MAX174BCWI (no "+"))
- Tube packaging suited for low-volume kitting (vs MAX174BCWI+T)
- Higher throughput (125 kSPS) vs MAX162 family (vs MAX162BCNG+)
Notes de conception
Estimated: at +5 V digital supply drawing I_DD and ±15 V analog rails drawing I_CC, total power dissipation is approximately 150 mW to 250 mW. Add 10 µF tantalum and 0.1 µF ceramic bypass capacitors as close as possible to the DVDD (+5 V), +VCC (+15 V), and -VCC (-15 V) supply pins. A ferrite bead between the +5 V analog and digital rails is recommended to prevent digital switching noise from corrupting the conversion result. Estimated based on datasheet typical figures.
Use a single ground plane subdivided between analog (AGND) and digital (DGND) sections, with the connections made only at the AGND/DGND pins of the ADC. Route the parallel data bus away from the analog input traces to avoid digital coupling into the sample-and-hold input; the data bus should be 50 Ω characteristic impedance if you are running longer than 50 mm. Power-trace widths should be sized for at least 200 mA current to handle inrush during power-up without dropping more than ~50 mV.
Three pitfalls to avoid: (1) Operating the AIN pin outside the absolute-maximum range can latch-up the device - add external clamping diodes if the input can exceed +VCC+0.3 V or fall below -VCC-0.3 V during fault conditions. (2) The on-chip reference requires a 50 µA to 500 µA load to maintain regulation - never short REF to AGND. (3) Forgetting to strap the RANGE and BIP pins correctly before applying analog input can produce incorrect conversion results and corrupt calibration; always verify these pins with a multimeter at power-up.
The MAX174BCWI+ tracks analog input continuously even when not converting, so high-impedance signal sources should be buffered by an op-amp (e.g. MAX4250) to avoid droop. Source impedance below 1 kΩ is recommended to keep settling errors below ¼ LSB; higher impedances degrade INL at full-scale inputs. For 8-channel multiplexing, use a Maxim DG408 or equivalent low-charge-injection multiplexer and provide at least 1 µs between channel switch and conversion start to allow the S&H capacitor to settle.
Informations de conformité
"+" suffix indicates RoHS compliance. AEC-Q100 not applicable (commercial-grade only).
