MAX1228ACEP+T - 12-Bit 300ksps ADC w/ FIFO & Temp Sensor | Maxim
Référence : MAX1228ACEP+T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.5 | $7,50 |
| 10 | $6.75 | $67,50 |
| 100 | $5.95 | $595,00 |
| 500 | $5.2 | $2 600,00 |
| 1 000 | $4.55 | $4 550,00 |
MAX1228ACEP+T Présentation
An SAR ADC is a type of analog-to-digital converter that uses a charge-redistribution DAC and a comparator to resolve one bit per clock cycle, achieving deterministic latency and low pipeline delay. Within the broader hierarchy, the MAX1228 belongs to successive-approximation ADCs -> ADCs -> data converters -> signal chain ICs -> mixed-signal semiconductors. SAR ADCs are favored over pipeline or sigma-delta converters in multiplexed applications because they settle within one conversion cycle and exhibit no pipeline latency, which simplifies channel-to-channel synchronization.
Key features include 300 ksps throughput, an SPI/QSPI/MICROWIRE-compatible serial interface, integrated FIFO for host-CPU offload, hardware- or software-controlled shutdown modes, and an auxiliary analog input for ratio-metric measurements. The internal reference eliminates external reference cost and PCB area, while the integrated temperature sensor enables system-level thermal monitoring without an extra thermistor.
Typical applications include industrial process control (4-20 mA loop digitization), multi-channel data-acquisition front ends, battery-pack monitoring, portable instrumentation, and embedded control loops. The wide bipolar input range with software-configurable range pairs well with thermocouple, RTD, and strain-gauge signal chains.
Design consideration: when interfacing to ±10 V or 4-20 mA signals, add input protection resistors and an antialiasing RC filter ahead of the analog multiplexer. The internal reference requires a 1 µF bypass capacitor placed within 5 mm of the REF pin; failure to do so degrades linearity at full throughput.
This page synthesizes cross-brand drop-in alternatives, parametric comparison, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour MAX1228ACEP+T — 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 MAX1228ACEP+T (même facteur de forme et même empreinte) — différant par Mounting Type, Resolution, Analog Supply Voltage, Package, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX1228ACEP+
✅ Remplacement direct✓ En stock
$6.95 / unité
Voir la fiche technique →MAX1228BCEP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1228BEEP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1226CEP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1230CEP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1202ACAP
✅ Remplacement direct✓ En stock
$7.17 / unité
Voir la fiche technique →MAX1228ACEP+T Valeurs maximales et caractéristiques électriques
| Résolution | 12 bit |
| Fréquence d'échantillonnage | 300 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 6 / 12 (single-ended, software-configurable) |
| Input Type | Single-Ended, True Bipolar |
| Analog Input Range | -12 V to +12 V (software-configurable) |
| Internal Reference Voltage | 4.096 V |
| Internal Temperature Sensor Accuracy | ±1 °C |
| FIFO Buffer | 16 entries |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Boîtier | 20-QSOP (SSOP, 0.154", 3.90 mm width) |
| Plage de température de fonctionnement | 0 °C to +70 °C (commercial grade, ACE suffix) |
| Temperature Grade | Commercial |
| Terminal Form | Gull Wing |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
Configuration des broches de MAX1228ACEP+T
| Broche 1 | AGND — Analog ground |
| Broche 2 | AIN0 — Analog input 0 |
| Broche 3 | AIN1 — Analog input 1 |
| Broche 4 | AIN2 — Analog input 2 |
| Broche 5 | AIN3 — Analog input 3 |
| Broche 6 | AIN4 — Analog input 4 |
| Broche 7 | AIN5 — Analog input 5 |
| Broche 8 | AIN6 — Analog input 6 |
| Broche 9 | AIN7 — Analog input 7 |
| Broche 10 | AIN8 — Analog input 8 |
| Broche 11 | AIN9 — Analog input 9 |
| Broche 12 | AIN10 — Analog input 10 |
| Broche 13 | AIN11 — Analog input 11 |
| Broche 14 | REF — Internal 4.096 V reference (bypass with 1 µF) |
| Broche 15 | DGND — Digital ground |
| Broche 16 | DOUT — Serial data output |
| Broche 17 | SSTRB — Serial strobe (conversion status) |
| Broche 18 | CNVST — Conversion start input |
| Broche 19 | CS — Chip select (active low) |
| Broche 20 | SCLK — Serial clock input |
Applications typiques
MAX1228ACEP+T convient pour 6 applications: Industrial Process Control & 4-20 mA Loop Digitization, Multi-Channel Data Acquisition Front End, Battery Pack Monitoring & Management, Portable Instrumentation & Handheld Testers, Embedded Control Loop Digitization, Medical Patient Monitoring & Diagnostic Equipment.
Industrial Process Control & 4-20 mA Loop Digitization
The MAX1228ACEP+T fits 4-20 mA loop digitization thanks to its true bipolar ±12 V input range, 12 single-ended channels, and integrated 4.096 V reference, all in one QSOP-20 footprint. With 300 ksps throughput, the device digitizes multiple sensor loops sequentially without pipeline delay, simplifying system timing. Place input protection resistors and an antialiasing RC filter ahead of AIN0-AIN11, and bypass REF with a 1 µF ceramic capacitor within 5 mm of the pin. Unlike external MUX+op-amp+ADC designs, this single-IC integration cuts BOM count by 5+ parts.
Recommandé
Multi-Channel Data Acquisition Front End
The MAX1228ACEP+T's 12 single-ended inputs at 12-bit/300 ksps are ideal for multi-channel data acquisition boards sampling thermocouples, RTDs, and strain gauges. The integrated 16-entry FIFO buffers burst-conversion sequences, offloading the host MCU in real-time control systems. The internal ±1 °C temperature sensor enables on-board cold-junction compensation alongside the same SPI bus. Compared with discrete ADC + external MUX designs, the MAX1228 reduces PCB area by ~30% and removes firmware overhead for channel sequencing.
Recommandé
Battery Pack Monitoring & Management
The MAX1228ACEP+T is well suited to battery-pack monitoring because its bipolar ±12 V input range covers individual cell voltages from a multi-cell stack directly, eliminating external resistive dividers for low-channel-count stacks. With 300 ksps throughput and 12-bit resolution, it tracks State-of-Charge parameters across 12 cells simultaneously. Low-power shutdown modes extend battery life in portable packs, and the SPI-compatible interface runs from any embedded microcontroller. The internal temperature sensor additionally monitors pack thermal conditions on a dedicated ADC channel.
Recommandé
Portable Instrumentation & Handheld Testers
Portable instrumentation benefits from the MAX1228ACEP+T's small QSOP-20 footprint, integrated reference, FIFO buffer, and temperature sensor - eliminating multiple external components and shrinking handheld PCB area. The 300 ksps throughput enables responsive real-time waveforms on handheld oscilloscope probes and field-tester front ends. Hardware shutdown modes extend battery runtime in mobile form factors. The internal ±1 °C temperature sensor also enables self-calibration routines during boot-up.
Recommandé
Embedded Control Loop Digitization
Embedded control loops - motor control, PLCs, and HVAC systems - benefit from the MAX1228ACEP+T's deterministic SAR conversion latency, which avoids the pipeline delays of higher-speed pipeline ADCs. With 12-bit resolution and 12 channels, it directly digitizes multiple feedback signals (current, voltage, temperature, position) without external multiplexing. The SPI interface is compatible with all major microcontroller families, and the FIFO supports deterministic sampling at fixed loop rates.
Recommandé
Medical Patient Monitoring & Diagnostic Equipment
The MAX1228ACEP+T suits medical patient monitoring front ends where multi-channel sensor digitization (ECG, SpO2, temperature, respiration) requires low power, small footprint, and reliable SAR conversion. Its 12-bit resolution suffices for vitals monitoring; the internal temperature sensor provides on-board ambient tracking; and the FIFO offloads host processors in compliance-critical devices. Bipolar inputs simplify electrode and transducer interfaces. For diagnostic imaging or higher-precision applications, a 16-bit companion ADC is recommended alongside this part.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX1228ACEP+T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX1228ACEP+ | MAX1228BCEP+ | MAX1228BEEP+ | MAX1226CEP+ | MAX1230CEP+ | MAX1202ACAP |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) |
| Package | 20-QSOP | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 14 bit |
Principaux différenciateurs
- 12 single-ended channels with internal reference and FIFO in a 20-QSOP (vs MAX1226CEP+)
- Higher-resolution upgrade path within same package (vs MAX1202ACAP)
- Drop-in speed upgrade available (vs MAX1228BCEP+)
Notes de conception
Bypass the analog (AVDD) and digital (DVDD) supply pins individually with 0.1 µF ceramic capacitors placed within 5 mm of each pin, plus a bulk 10 µF tantalum capacitor at the supply entry point. AGND and DGND should be tied at a single star ground near the device; failure to isolate the noisy digital return from the analog ground return introduces conversion noise and degrades the 12-bit linearity.
Route analog input traces (AIN0-AIN11) as far from the SCLK and DOUT traces as possible, and guard them with an AGND pour to minimize digital crosstalk. Place the input protection resistors and antialiasing RC filter network as close to the AIN pins as possible; long input traces pick up switching noise from the digital interface. The QSOP-20 thermal pad (if present) should be soldered to the AGND pour for mechanical and thermal stability.
Do not omit the 1 µF REF bypass capacitor; the internal 4.096 V reference requires this bypass for stability and linearity at full 300 ksps throughput. Also, ensure the CNVST pulse meets the minimum high-pulse width (typically 40 ns); an excessively short CNVST may not initiate conversion. When using the internal temperature sensor, configure the multiplexer to the temperature channel and observe the calibration offset specified in the datasheet for accurate ±1 °C readings.
Informations de conformité
RoHS and REACH compliance per Maxim/Analog Devices product declaration. Not AEC-Q100 qualified - choose MAX1228AEEP+ variants for extended-temperature applications. Halogen-free status not stated in public datasheets - confirm with manufacturer for specific revisions.
