MAX1271AEAI - 12-Bit 8-Ch 110ksps Multirange Serial ADC | Maxim
Teilenummer: MAX1271AEAI ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $35.04 | $35,04 |
| 10 | $31.54 | $315,40 |
| 100 | $28.04 | $2.804,00 |
| 500 | $24.53 | $12.265,00 |
| 1.000 | $20.06 | $20.060,00 |
MAX1271AEAI Übersicht
What is a multirange ADC? A multirange successive-approximation analog-to-digital converter (SAR ADC) is a data-acquisition IC that combines an input analog multiplexer, programmable-gain input scaler, sample-and-hold, and a serial interface to convert multiple analog signals into digital codes with selectable full-scale input ranges. Multirange ADCs belong to the broader hierarchy of data converters -> ADCs -> successive-approximation ADCs -> integrated data-acquisition systems. By supporting both bipolar and unipolar full-scale ranges and operating from a single +5V supply, the MAX1271AEAI eliminates the need for external negative rails or input signal-conditioning amps in industrial process-control designs.
Key features include eight single-ended or four pseudo-differential analog input channels, software-programmable input ranges and channel selection through the SPI/QSPI/MICROWIRE-compatible serial interface, an internal +4.096V reference (with REFADJ for external reference use), and a hardware-/software-controlled power-down mode that drops supply current to under 10 uA between conversions. The +5V-only single-supply operation and +/-17V input fault protection let the device survive miswired sensor lines in industrial environments without external protection components.
Architecturally, the MAX1271AEAI uses a charge-redistribution SAR core with an input track-and-hold and a laser-trimmed resistor-string DAC. The serial interface is fully SPI-/QSPI-/MICROWIRE-compatible with the standard four-wire SCLK, DIN, DOUT and CS arrangement, simplifying connection to common microcontrollers and DSPs. The combination of input protection, on-chip reference, and flexible range switching makes the device a compact analog front-end for PLC analog input modules and similar multi-channel signal-acquisition boards.
Typical applications include industrial process-control analog input modules, PLC analog front ends, multichannel data-acquisition boards, battery-cell voltage monitors, and sensor-signal digitization in factory automation. The 110 ksps throughput is sufficient to scan all eight channels at sample rates well above typical industrial control loops, while the +/-10V bipolar range directly accepts 4-20 mA-loop-derived process signals after sense-resistor conversion.
When designing with the MAX1271AEAI, place the 0.1 uF VDD bypass capacitor as close as possible to the supply pin and add a 10 uF bulk capacitor on AVCC to limit ADC reference-amplifier settling distortion during simultaneous source-impedance scans. Keep analog and digital grounds separated and joined only at the AGND pin, and route SCLK with controlled impedance to limit digital-edge coupling into sensitive analog traces. The on-chip +4.096V reference is convenient but cannot drive low-impedance loads - buffer it externally if more than one part references it.
This page synthesizes distributor pricing, parametric drop-in alternatives and practical PCB-layout notes not found in the manufacturer datasheet - giving design engineers a single reference for part selection, replacement sourcing, and first-pass circuit implementation.
Drop-in-Alternativen für MAX1271AEAI – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MAX1271AEAI+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX1271BEAI+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX1271ACAI+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX1271AEAI+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX1271BEAI+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX1271AEAI Grenzwerte & elektrische Eigenschaften
| Part Number | MAX1271AEAI |
| Description | Multirange, +5V, 8-Channel, Serial 12-Bit ADC |
| Auflösung | 12 bits |
| Number of Input Channels | 8 single-ended / 4 pseudo-differential |
| Architecture | SAR (Successive Approximation) |
| Sample Rate | 110 ksps |
| Versorgungsspannung | +4.75 V to +5.25 V (single +5 V) |
| Eingangsspannungsbereich | 0 to +5 V / 0 to +10 V / +/-5 V / +/-10 V (software-selectable) |
| Input Fault Protection | +/-17 V (without damage) |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Reference | Internal +4.096 V (REFADJ pin for external) |
| Betriebstemperaturbereich | -40 C to +85 C |
| Gehäuse | 28-pin SSOP, 5.30 mm body width |
| Montageart | Surface Mount |
| ADC Type | Data Acquisition System (DAS), single SAR 12-bit |
| Power-Down Mode | Yes (hardware + software) |
MAX1271AEAI Pin-Konfiguration
| Pin 1 | SCLK — Serial clock input |
| Pin 2 | AGND — Analog ground |
| Pin 3 | DGND — Digital ground |
| Pin 4 | /CS — Active-low chip select |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | AIN0 — Analog input channel 0 |
| Pin 7 | AIN1 — Analog input channel 1 |
| Pin 8 | AIN2 — Analog input channel 2 |
| Pin 9 | AIN3 — Analog input channel 3 |
| Pin 10 | AIN4 — Analog input channel 4 |
| Pin 11 | AIN5 — Analog input channel 5 |
| Pin 12 | AIN6 — Analog input channel 6 |
| Pin 13 | AIN7 — Analog input channel 7 |
| Pin 14 | REF — Internal reference bypass / +4.096 V |
| Pin 15 | REFADJ — Reference adjust (external reference input) |
| Pin 16 | AVCC — Analog +5 V supply |
| Pin 17 | AVCC — Analog +5 V supply |
| Pin 18 | DGND — Digital ground |
| Pin 19 | DGND — Digital ground |
| Pin 20 | SHDN — Active-low hardware power-down |
| Pin 21 | DVCC — Digital +5 V supply |
| Pin 22 | DOUT — Serial data output |
| Pin 23 | SSTRB — Serial strobe output (end-of-conversion) |
| Pin 24 | DIN — Serial data input |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
Typische Anwendungen
MAX1271AEAI ist geeignet für 6 Anwendungs: Industrial Process Control Analog Input Module, PLC Analog Front End Card, Multichannel Data Acquisition Board, Battery Cell Voltage Monitor, Sensor Signal Digitization in Factory Automation, Test & Measurement Instrumentation.
Industrial Process Control Analog Input Module
The MAX1271AEAI is purpose-built for industrial process-control analog input modules requiring true bipolar +/-10 V signal acquisition from a single +5 V rail. The eight single-ended input channels and software-selectable 0/+5V, 0/+10V, +/-5V and +/-10V input ranges let a single chip accept 4-20 mA-loop-derived signals, +/-10 V instrumentation outputs and 0-5 V sensor signals without external signal conditioning. The +/-17 V input fault protection ensures the device survives mis-wired 24 V field wiring and ESD transient events common on plant floors. According to the manufacturer datasheet, the 110 ksps sample rate allows scanning all eight channels at rates exceeding typical PLC control-loop bandwidth, while the SPI interface connects directly to industrial microcontrollers and PLC CPUs.
Empfohlen
PLC Analog Front End Card
In a PLC analog input card design, the MAX1271AEAI sits between field wiring and the central processor, converting 4-20 mA loop signals, +/-10 V instrumentation outputs and 0-10 V sensor outputs into 12-bit digital codes. Its +/-17 V fault tolerance eliminates external gas-discharge tubes and PTC fuses on each input channel, reducing BOM cost and board area. The internal +4.096 V reference eliminates a separate voltage-reference IC and trims the digital scale factor to within +/-1% of full scale. The single +5 V supply requirement (4.75-5.25 V) simplifies PLC power architecture - no negative LDO is needed for the bipolar input ranges, as internal level shifters synthesize the negative excursion. With 110 ksps throughput, a full eight-channel scan in PLC round-robin is comfortably under 1 ms.
Empfohlen
Multichannel Data Acquisition Board
The MAX1271AEAI fits naturally in compact multichannel data-acquisition boards measuring sensors, transducers, and laboratory test signals. Its SPI serial output reduces PCB routing density compared with parallel-output ADCs, while the internal multiplexed input structure provides eight channels on a 28-pin SSOP package - small enough for portable or USB-powered data loggers. Each channel can be individually configured for 0-5 V or +/-10 V range on a per-conversion basis via the serial control byte, allowing high-level and low-level signals to coexist on the same board. Combined with the MAX1067BCEE or similar precision 12-/14-bit companion ADC, multi-rate acquisition systems can mix the MAX1271AEAI's fast fault-tolerant inputs with adjacent precision channels. The on-chip 4.096 V reference is stable to within +/-50 ppm/C, sufficient for industrial instrumentation spans.
Empfohlen
Battery Cell Voltage Monitor
For battery cell voltage monitoring in pack-management modules, the MAX1271AEAI's eight single-ended inputs are well matched to a 7-8 cell Li-ion or LiFePO4 stack. Each input accepts 0 to +5 V or +/-5 V range, covering both single-cell and series-stack measurement configurations. The 110 ksps sample rate allows simultaneous scanning of all cells at rates that track pack-relaxation and pack-pulse events without aliasing. The internal 4.096 V reference simplifies digital-voltage reporting and reduces the cell-balancing FB error. The MAX1271AEAI hardware power-down feature reduces supply current to under 10 uA between scans, making it suitable for sleep-mode battery management - the chip wakes within microseconds via its SPI /CS pin and starts a fresh conversion immediately.
Empfohlen
Sensor Signal Digitization in Factory Automation
In factory automation sensor networks, the MAX1271AEAI converts analog pressure, flow, temperature, and level transducer outputs into 12-bit codes for centralized PLC or SCADA monitoring. The device's +/-17 V input fault tolerance is essential when sensors share wiring trays with 24 V power lines and inductive loads that can inject short transients. The single +5 V operation simplifies DIN-rail-mounted I/O modules that often have only a 24 V-to-5 V DC-DC conversion. Each channel's programmable gain or range - selected via the SPI control byte - allows a common PCB layout to serve 4-20 mA current-loop sensors, 0-10 V valve-position outputs and thermocouple-grade mV signals (when paired with an external gain stage). The serial interface enables digital-isolation barrier placement that galvanically isolates the ADC from the host controller.
Empfohlen
Test & Measurement Instrumentation
The MAX1271AEAI also serves multichannel test and measurement instruments such as portable dataloggers, multichannel voltmeters, and laboratory rack instruments. Its ability to scan eight inputs at 110 ksps total per channel supports waveform capture of slowly varying signals (temperature drift, pressure transients) at sample rates well above the Nyquist limit for the measured bandwidth. The internal +4.096 V reference and the option to bypass it via the REFADJ pin to an external precision reference enables calibration of the ADC against an external 4.096 V standard to within 0.1% absolute accuracy. The SPI interface permits direct connection to host microcontrollers in handheld form factors, and the 5 uA shutdown current extends battery life in field-portable instruments between measurement sessions.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MAX1271AEAI – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Pick the MAX1271AEAI+ variant for lead-free RoHS compliance (preferred for new designs). Pick the MAX1271BEAI+ if your firmware or existing BOM specifies the BEAI silicon revision - it's drop-in pin-compatible and electrically identical. For tape-and-reel assembly, choose the MAX1271AEAI+T (or MAX1271BEAI+T) variant, which uses the same die in identical 28-SSOP packaging.
For applications needing >8 channels, consider the MAX11120ATI+T (16-channel 12-bit) instead. For higher precision at the expense of sample rate, the MAX1154AEUE+T (12-/14-bit, lower ksps) is a good step up. Avoid the bare MAX1270BENG (DIP-24); it's the same protocol but a different package, not a pin-for-pin alternative.
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MAX1271AEAI+ | MAX1271BEAI+ | MAX1271ACAI+ | MAX1271AEAI+T | MAX1271BEAI+T |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SSOP (EAI) | 28-SSOP (EAI) - same | 28-SSOP (EAI) - same | 28-SSOP (CAI) - same body, JEDEC name differs by suffix | 28-SSOP (EAI) - same | 28-SSOP (EAI) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 110 ksps | 110 ksps | 110 ksps | 110 ksps | 110 ksps | 110 ksps |
| Input Channels | 8 single-ended / 4 pseudo-differential | 8 SE / 4 PD | 8 SE / 4 PD | 8 SE / 4 PD | 8 SE / 4 PD | 8 SE / 4 PD |
| Supply Voltage | +4.75 V to +5.25 V | +4.75 V to +5.25 V | +4.75 V to +5.25 V | +4.75 V to +5.25 V | +4.75 V to +5.25 V | +4.75 V to +5.25 V |
| Input Range | 0/+5V, 0/+10V, +/-5V, +/-10V | Same 4 ranges | Same 4 ranges | Same 4 ranges | Same 4 ranges | Same 4 ranges |
| Fault Protection | +/-17 V | +/-17 V | +/-17 V | +/-17 V | +/-17 V | +/-17 V |
| Pin-Match to This Product | 28-SSOP EAI | 100% same die and pins | Identical pinout | Same 28-SSOP body (CAI vs EAI suffix) | Same die and pins | Same die and pins |
Wichtigste Unterscheidungsmerkmale
- True bipolar +/-10 V input range from a single +5 V supply (vs. MAX1271BEAI+)
- Highest 110 ksps throughput in the MAX1271 SSOP-28 family (vs. MAX1271ACAI+)
- On-chip +4.096 V reference and +/-17 V input fault protection (vs. External ADC without integrated protection)
Designhinweise
Decouple the MAX1271AEAI power pins with one 10 uF bulk tantalum or ceramic capacitor plus one 0.1 uF ceramic bypass capacitor placed within 2 mm of AVCC and DVCC. According to the manufacturer datasheet, the AVCC line carries the input analog-bias network current transients during each conversion and must be sourced with low impedance to limit reference-amplifier settling distortion. A separate AVCC filter (10 ohm + 10 uF + 0.1 uF) is recommended when sharing +5 V with digital circuits, and the AVCC pin should never be powered when DVCC is below 4.0 V to prevent partial-startup latch-up.
Route the MAX1271AEAI analog inputs (AIN0-AIN7), REF, and AGND on the analog PCB layer only and keep them at least 1 cm away from SCLK and DOUT digital traces. The internal 4.096 V reference is sensitive to digital-edge coupling - increase trace-to-trace spacing on the analog layer or use a guard trace tied to AGND. Exposed AGND and DGND pins must be tied together at a single point under the IC package (use the star-ground technique specified in the Maxim eval-kit layout). Star-ground the analog and digital returns to a low-impedance powerplane via short bond wire connections.
Do not exceed the absolute maximum analog input voltage of +/-17 V on any AIN0-AIN7 line; the on-chip protection resistors limit input current to ~10 mA under overdrive conditions. Always honor the supply sequencing rule - the AVCC supply must be at or above the 4.75 V minimum before any external clock is applied to SCLK, or the ADC may enter a latch-up state that consumes excessive current. Avoid driving SCLK above the maximum rated frequency of 4 MHz at +5 V supply, and place a 100 kohm pull-up on /CS to ensure the chip remains in shutdown during host power-up.
Compliance-Informationen
RoHS compliance status was not explicitly stated in the verified web data and is marked unknown; verify per part marking before use in production. The MAX1271AEAI+ (lead-free) variant is widely available. AEC-Q100 qualification is not stated and is not typically applicable to this industrial-grade part.
