MAX1245BEAP - 12-Bit 8-Ch 100ksps +3.3V ADC | Maxim Integrated
Référence : MAX1245BEAP ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $16.19 | $16,19 |
| 10 | $14.57 | $145,70 |
| 100 | $13.2 | $1 320,00 |
| 500 | $12.1 | $6 050,00 |
| 1 000 | $11.05 | $11 050,00 |
MAX1245BEAP Présentation
An ADC (analog-to-digital converter, also written A/D converter or A-to-D) is a mixed-signal integrated circuit that samples a continuous-time analog voltage and converts it into a discrete digital code that a microcontroller or DSP can process. The MAX1245 family belongs to the SAR (successive approximation register) sub-type, which internally performs a binary-search algorithm using an internal DAC and comparator. Within the broader taxonomy, this part sits under data converter -> ADC -> precision SAR ADC -> low-power multi-channel ADC -> power-management-aware signal-chain IC. SAR ADCs are favored when deterministic latency, low latency, and simplicity are required.
Key features include 8 single-ended analog input channels (or 4 differential pairs via software control), an internal track/hold with >2 MHz input bandwidth, a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, hardware- and software-controlled power-down modes (1 µA max), and an internal 2.5V reference that can also be overdriven by an external reference for higher-accuracy applications.
Typical applications include portable 2.5V and 3.3V data-acquisition systems, battery-powered instrumentation, pen digitizers, patient monitoring, and process-control I/O modules where multiple sensors share a single ADC. The low 1 mW (typ) power dissipation at 3V and the 1 µA power-down current make it ideal for power-constrained designs.
When designing with the MAX1245BEAP, ensure the analog input range stays within the supply rails (rail inputs without overdrive damage), use a 0.1 µF ceramic bypass close to the supply, and observe the maximum 10 MHz SCLK limit of the SPI interface to maintain linearity. The internal reference settles within 1 ms after power-up, so a short delay is required before the first conversion. As of 2026-10-14, distributor pricing starts around $16.19 per 1ku list price from Maxim Integrated. This page synthesizes distributor pricing, drop-in same-package alternatives (MAX1245AEAP, MAX1245BCAP), and design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour MAX1245BEAP — 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 MAX1245BEAP (même facteur de forme et même empreinte) — différant par Interface, Resolution, Sampling Rate, Supply Voltage.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX1245AEAP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1245BCAP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1245BEAP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1245BEAP+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1145BEAP+
✅ Remplacement direct✓ En stock
$5.95 / unité
Voir la fiche technique →MAX1245BEAP Valeurs maximales et caractéristiques électriques
| Résolution | 12 bit |
| Number of Channels | 8 single-ended / 4 differential |
| Architecture | SAR (Successive Approximation) |
| Fréquence d'échantillonnage | 100 ksps |
| Tension d'alimentation | +2.375 V to +3.3 V |
| Supply Current (active) | 1.3 mA typ |
| Supply Current (power-down) | 1 µA max |
| Input Bandwidth (track/hold) | >2 MHz |
| Interface | 3-wire SPI / QSPI / MICROWIRE-compatible serial |
| Internal Reference | 2.5 V |
| External Reference Range | 1.0 V to VDD |
| Boîtier | 20-pin SSOP |
| Plage de température de fonctionnement | -40 C to +85 C (E grade) |
| Niveau MSL | 1 |
| Statut RoHS | Compliant |
Configuration des broches de MAX1245BEAP
| Broche 1 | VDD — +2.375 V to +3.3 V supply |
| Broche 2 | AIN0 — Analog input channel 0 |
| Broche 3 | AIN1 — Analog input channel 1 |
| Broche 4 | AIN2 — Analog input channel 2 |
| Broche 5 | AIN3 — Analog input channel 3 |
| Broche 6 | AIN4 — Analog input channel 4 |
| Broche 7 | AIN5 — Analog input channel 5 |
| Broche 8 | AIN6 — Analog input channel 6 |
| Broche 9 | AIN7 — Analog input channel 7 |
| Broche 10 | GND — Analog/digital ground |
| Broche 11 | REF — Reference input/output in/out |
| Broche 12 | REFADJ — Reference adjust / bypass |
| Broche 13 | SCLK — Serial clock input |
| Broche 14 | DOUT — Serial data output |
| Broche 15 | DIN — Serial data input |
| Broche 16 | CS — Chip select (active low) |
| Broche 17 | SHDN — Shutdown (active low) |
| Broche 18 | AGND — Analog ground |
| Broche 19 | DGND — Digital ground |
| Broche 20 | VDD — +2.375 V to +3.3 V supply |
Applications typiques
MAX1245BEAP convient pour 6 applications: Portable Battery-Powered Data Acquisition, Industrial Process Control I/O Modules, Patient Monitoring and Medical Instrumentation, Pen Digitizers and Touch Panels, Battery Cell Monitoring and Management, Sensor Signal Conditioning Hubs.
Portable Battery-Powered Data Acquisition
The MAX1245BEAP suits portable battery-powered data-acquisition front ends because it draws only 1.3 mA active and 1 µA in power-down, and operates directly from a +2.375 V to +3.3 V supply rail that matches a single Li-ion cell or two alkaline cells. Its 8 single-ended channels scan multiple sensor outputs (temperature, pressure, battery voltage) sequentially through one SPI port to a low-power MCU. Unlike higher-speed SAR ADCs it adds no significant quiescent load, extending runtime in field instruments and pen digitizers.
Recommandé
Industrial Process Control I/O Modules
In 4-20 mA loop-powered or PLC I/O modules, the MAX1245BEAP multiplexes up to eight analog sensor inputs into one SAR ADC, reducing BOM cost and board area compared to one ADC per channel. The internal 2.5 V reference sets the input span, but an external precision reference (1.0 V to VDD) can be overdriven for tighter absolute accuracy in closed-loop PID control. The 100 ksps throughput supports sub-millisecond loop times, while the SPI/QSPI/MICROWIRE-compatible serial interface glues directly to most microcontrollers and DSPs.
Recommandé
Patient Monitoring and Medical Instrumentation
The MAX1245BEAP's low power dissipation and small 20-pin SSOP package fit medical patient-monitoring designs (pulse oximetry, blood-pressure cuffs, glucose meters) where board area is tight and battery life matters. The 8-channel multiplexer can scan multiple sensor bridges or bioelectric signals through one ADC, and the 1 µA power-down current is critical for sleep modes between measurements. Unlike higher-power continuous ADCs, the MAX1245BEAP can be duty-cycled on to extend battery life in portable, low-power clinical devices.
Recommandé
Pen Digitizers and Touch Panels
Pen-digitizer and resistive touch-panel controllers digitize X/Y position and pen pressure from a 4-wire or 5-wire touch stack. The MAX1245BEAP's 4-differential-channel mode (via software) directly captures X+, X-, Y+, Y- from the touch panel through one ADC, while the 8-channel mode handles additional pen-pressure inputs. The 100 ksps throughput sustains >50 Hz update rates for smooth handwriting capture, and the low-power shutdown between samples extends battery life in wireless stylus designs.
Recommandé
Battery Cell Monitoring and Management
The MAX1245BEAP is well-suited to multi-cell battery-monitoring boards in 2.5 V-3.3 V Li-ion or 2-cell alkaline packs, where each cell or pack voltage is multiplexed into the ADC. The internal 2.5 V reference scales to a 0-2.5 V input span via a resistive divider, and the 1 µA shutdown current minimizes quiescent drain between scans. Unlike dedicated battery monitors, this SAR ADC adds diagnostic-read flexibility for the IM and current sensing on a shared bus.
Recommandé
Sensor Signal Conditioning Hubs
In sensor-hub designs that aggregate thermistors, photodiodes, strain gauges, and gas-sensor outputs, the MAX1245BEAP multiplexes up to 8 analog inputs through a single SPI port, eliminating per-signal ADCs and reducing PCB area. The internal track/hold with >2 MHz input bandwidth preserves transient signal fidelity, while the 1 µA power-down mode enables aggressive duty cycling. The MAX16197 is a recommended companion for system-level health monitoring and watchdog timing on the same bus.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX1245BEAP — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX1245AEAP+ | MAX1245BCAP+ | MAX1245BEAP+ | MAX1245BEAP+T | MAX1145BEAP+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Supply Voltage | +2.375 V to +3.3 V | +2.375 V to +3.3 V | +2.375 V to +3.3 V | +2.375 V to +3.3 V | +2.375 V to +3.3 V | 3.3 V only |
| Linearity Grade | B grade | A grade (tighter) | B grade | B grade | B grade | B grade |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI |
Principaux différenciateurs
- Optimized for low-voltage 2.5 V-3.3 V portable operation (vs MAX147)
- Internal 2.5 V reference with external override capability (vs MAX1245AEAP+)
- 8 single-ended / 4 differential channel multiplexer with software switching (vs MAX1145BEAP+)
Notes de conception
Decouple the VDD pin (pin 1 and pin 20) with a 0.1 µF ceramic capacitor placed within 3 mm of each supply pin, and add a 10 µF bulk tantalum/ceramic at the supply entry point. The MAX1245BEAP draws 1.3 mA active and 1 µA power-down, so a low-ESR bypass is critical to avoid supply droop during SCLK-driven charge kickback events that would otherwise degrade linearity.
Keep analog input traces short and routed over a continuous analog ground plane to minimize charge-injection noise. The internal track/hold has >2 MHz input bandwidth, so stray capacitance beyond 20 pF at the AIN pin can attenuate the sampled-and-held voltage and increase conversion error. For high-impedance sources, add a 1 nF to 10 nF ceramic capacitor at each AIN pin to absorb sampled-charge kickback.
Do not exceed the maximum SCLK frequency of 10 MHz - faster clocks will degrade linearity and produce bit errors. Wait at least 1 ms after power-up (or after exiting shutdown) before initiating the first conversion to allow the internal 2.5 V reference to settle. Driving REFADJ low disables the internal reference, so use that mode only when an external reference is connected. Failure to obey these rules is the most common cause of noisy or stuck readings.
When using the internal 2.5 V reference, bypass REF (pin 11) with a 4.7 µF low-ESR ceramic or tantalum capacitor to AGND. For higher-accuracy designs, drive REF with an external low-drift reference (e.g. MAX6126 or equivalent) instead of the internal one, but disable the internal reference via REFADJ first. The serial interface (SCLK/DOUT/DIN/CS) should be routed away from the analog input traces to avoid digital coupling into the analog path.
Informations de conformité
RoHS and REACH compliant per Maxim Integrated product page. Not AEC-Q100 qualified - this part is not designed for automotive applications. Lead-free + suffix variants available (MAX1245BEAP+, MAX1245BEAP+T).
