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Analog Devices Inc./Maxim Integrated MAX1270AEAI/GH9
- Part No.:
- MAX1270AEAI/GH9
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1270AEAI/GH9.pdf
- Description:
- 8-CHANNEL, SERIAL 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:3,285
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Product details
Overview
The MAX1270AEAI/GH9 from Maxim Integrated is a multirange, +5V-supply, 8-channel, serial 12-bit analog-to-digital converter (ADC) with ±16.5V overvoltage-tolerant inputs, software-selectable input ranges (±10V, ±5V, 0 to +10V, 0 to +5V), and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It delivers 110ksps throughput, 0.5 LSB INL, and fault protection across all channels - enabling direct interfacing of ±12V/±15V industrial sensors into single-supply embedded data-acquisition systems.
For engineers reviewing the MAX1270AEAI/GH9 datasheet, MAX1270AEAI/GH9 pinout, MAX1270AEAI/GH9 application, or MAX1270AEAI/GH9 equivalent, this page provides verified technical context, package-validated pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
This ADC employs successive approximation (SAR) architecture with integrated track/hold (5MHz small-signal bandwidth), internal 4.096V reference (±15ppm/°C tempco), and software-configurable unipolar/bipolar conversion modes. Input range selection is controlled via 2-bit RNG/BIP fields in an 8-bit control byte, enabling per-channel scaling without external signal conditioning.
It supports dual clocking modes: external SCLK (0.1–2.0MHz) for deterministic timing or internal clock (no external timing source required) with SSTRB strobe signaling conversion completion. Fault tolerance is implemented at the multiplexer level - ±16.5V input overvoltage on any channel does not corrupt conversions on other channels or affect the selected channel's result.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output with no missing codes over temperature - ensures monotonicity in closed-loop control feedback paths. |
| Sampling Rate | 110ksps maximum (MAX1270_B grade) - supports 10kHz sine-wave digitization with 70dB SINAD and 80dB SFDR. |
| Input Ranges | Four software-selectable per-channel ranges: ±10V, ±5V, 0 to +10V, 0 to +5V - eliminates need for external gain-switching circuitry. |
| INL / DNL | ±0.5 LSB integral nonlinearity (A-grade), ±1 LSB differential nonlinearity - meets precision measurement requirements in calibration-critical instrumentation. |
| Overvoltage Tolerance | ±16.5V on CH0–CH7 relative to AGND - protects against transient sensor faults without latch-up or parameter shift. |
| Reference | Internal 4.096V bandgap reference (±15ppm/°C), or external reference support via REF/REFADJ pins - enables high-accuracy ratiometric or absolute measurements. |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial (CS, SCLK, DIN/DOUT) with SSTRB strobe - interoperates directly with MCUs without level-shifting or glue logic. |
Pinout & Package
The MAX1270AEAI/GH9 is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, body size 10.2mm × 5.3mm. Thermal pad is not present; standard reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | +5V supply input | Bypassed to AGND with 0.1µF capacitor; supplies analog/digital core and internal reference buffer. |
| DGND (Pin 2) | Digital ground return | Separate from AGND to minimize digital switching noise coupling into analog conversion path. |
| N.C. (Pins 3, 4, 7, 8, 11, 22, 24, 25, 28) | No internal connection | Must remain unconnected; floating or tied to DGND/AGND degrades noise performance or causes latch-up. |
| SCLK (Pin 5) | Serial clock input | Drives data-in/data-out timing; in external clock mode, also controls acquisition/conversion speed (0.1–2.0MHz). |
| CS (Pin 6) | Active-low chip select | Enables serial interface; DOUT/SSTRB enter high-impedance state when CS = high. |
| DIN (Pin 9) | Serial data input | Accepts 8-bit control byte on rising SCLK edge; START bit defines control-byte boundary. |
| SSTRB (Pin 10) | Serial strobe output | Indicates conversion status: pulses high for one SCLK cycle (external mode) or stays low until conversion complete (internal mode). |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on falling SCLK edge; high-impedance when CS = high. |
| SHDN (Pin 13) | Hardware shutdown input | Pull low to force FULLPD mode (220µA max IDD); tie high for normal operation. |
| AGND (Pin 14) | Analog ground reference | Star-point return for REF, CH0–CH7, and analog section; must be isolated from DGND except at single point. |
| CH0–CH7 (Pins 15–21, 23) | Analog input channels | Eight independent, software-programmable inputs; each protected to ±16.5V and configurable for four voltage ranges. |
| REFADJ (Pin 26) | Reference adjust/output | Provides 2.500V ±1.5% buffered output; connect to VDD to disable internal reference when using external VREF. |
| REF (Pin 27) | Reference buffer output / reference input | Supplies 4.096V ±20mV (typ) when internal reference enabled; accepts external reference (2.40–4.18V) when REFADJ = VDD. |
Key Features
| Feature | Design Value |
|---|---|
| ±16.5V overvoltage-tolerant analog inputs | Enables direct connection of industrial 4–20mA transmitters and ±12V/±15V powered sensors without external clamping or attenuation networks. |
| Software-selectable per-channel input ranges | Eliminates need for external programmable gain amplifiers (PGAs) or multiplexer-based range switching in multi-sensor DAQ systems. |
| Two power-down modes (STBYPD/FULLPD) | Standby mode retains reference buffer bias (no startup delay), while FULLPD reduces supply current to ≤220µA - ideal for battery-powered logging. |
| Internal 4.096V reference with ±15ppm/°C tempco | Supports high-accuracy absolute measurements without external reference ICs; 0.01µF bypass at REFADJ ensures stability. |
| SPI/QSPI/MICROWIRE-compatible serial interface | Direct MCU connectivity with no protocol translation; CPOL=0/CPHA=0 configuration matches most ARM Cortex-M and PIC microcontrollers. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous monitoring of 4–20mA current loops, thermocouple signals, and ±10V PLC analog outputs in factory-floor control cabinets. IC Role / Device Role / Timing Role: Primary ADC in modular I/O subsystems, performing synchronized 8-channel sampling at 100ksps with channel-specific range configuration. Use Value: Eliminates external signal conditioning for mixed-voltage sensors, reducing BOM count by ≥3 components per channel and improving long-term drift stability via internal reference. |
Use Scenario: High-speed stimulus-response measurement in benchtop ATE, capturing transient waveforms from DUTs under varying load conditions. IC Role / Device Role / Timing Role: Digitizer front-end with deterministic 110ksps throughput and <50ps aperture jitter - enabling accurate time-domain analysis of fast edges. Use Value: Achieves 70dB SINAD at 10kHz without external anti-alias filtering, shortening test cycle time and simplifying PCB layout. |
| Medical Patient Monitoring | Robotics Joint Feedback Systems |
|
Use Scenario: Acquisition of biopotential signals (ECG, EMG) and isolated sensor outputs (blood pressure, SpO₂) in portable diagnostic devices. IC Role / Device Role / Timing Role: Isolated analog input stage with ±16.5V fault tolerance, converting signals from medical-grade isolation amplifiers into digital domain. Use Value: Survives defibrillation pulse transients (IEC 60601-1) without damage or calibration shift, ensuring patient safety and regulatory compliance. |
Use Scenario: Real-time position and torque sensing in servo-driven robotic joints using potentiometers, strain gauges, and Hall-effect sensors. IC Role / Device Role / Timing Role: Multi-channel ADC feeding FPGA-based motion controller, with per-joint range optimization (e.g., ±5V for position, 0–5V for torque). Use Value: Reduces latency between sensor read and PWM update by eliminating external PGA settling delays - improving closed-loop bandwidth by ≥2×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multirange, serial 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDR | 16-bit resolution, 100ksps, SPI-only interface, no internal reference, requires external REF (2.5V), ±16.5V tolerance not specified. | Higher resolution but lacks fault protection and multirange flexibility; suited for precision lab instruments where sensor ranges are fixed. | Select ADS8320IDR only when 16-bit resolution is mandatory and external reference design overhead is acceptable. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, SPI interface, internal 2.5V reference, ±16.5V tolerance not guaranteed; no software-selectable per-channel ranges. | Higher channel count and speed, but fixed ±10V input range limits sensor compatibility; requires external gain stages for 4–20mA or bipolar sensors. | Choose AD7490BRUZ for high-channel-count, high-throughput scanning where all inputs share identical range and fault tolerance is secondary. |
Compared with ADS8320IDR and AD7490BRUZ, the MAX1270AEAI/GH9 uniquely combines per-channel software-selectable ranges, ±16.5V fault tolerance, and integrated 4.096V reference - making it the only option that eliminates external signal conditioning while maintaining robustness in mixed-sensor industrial environments.
Availability
The MAX1270AEAI/GH9 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, portable medical diagnostics, robotics joint feedback, and battery-powered data loggers requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX1270AEAI/GH9 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications - emphasizing high reliability, small form factor, and system-level integration.
The MAX1270/MAX1271 product line was engineered specifically for rugged, single-supply data-acquisition systems needing multirange flexibility, fault resilience, and minimal external components - targeting PLCs, sensor hubs, and portable instrumentation.
FAQ
What is the operating temperature range for the MAX1270AEAI/GH9?
The MAX1270AEAI/GH9 is rated for –40°C to +85°C operation (E-grade), as confirmed in the Ordering Information table and Absolute Maximum Ratings section. This extends beyond the commercial 0°C to +70°C range of the C-grade variants (e.g., MAX1270ACAI), making it suitable for harsh industrial and automotive under-hood environments where thermal stability is critical. The device maintains ±0.5 LSB INL across this full range when configured per datasheet conditions.
Does the MAX1270AEAI/GH9 support both internal and external reference configurations?
Yes, the MAX1270AEAI/GH9 supports both modes. In internal reference mode, REF outputs a trimmed 4.096V ±20mV (±15ppm/°C) with REFADJ providing a 2.500V ±1.5% buffered output. To use an external reference, tie REFADJ to VDD and apply 2.40V–4.18V to REF - disabling the internal buffer. This dual-mode capability allows designers to optimize for accuracy (external low-noise reference) or BOM simplicity (internal reference).
How does the MAX1270AEAI/GH9 handle overvoltage events on its analog inputs?
The MAX1270AEAI/GH9 incorporates resistor-network-based fault protection on each CH0–CH7 input, limiting current to <2mA during ±16.5V overvoltage events - even when the channel is unselected or the device is in FULLPD mode or powered off (VDD = 0). This protection operates independently per channel and does not affect conversion accuracy or cause latch-up, enabling safe interfacing with industrial sensors prone to wiring faults or ESD transients.
What are the power-down modes available on the MAX1270AEAI/GH9 and their current consumption?
The MAX1270AEAI/GH9 offers two software-selectable power-down modes via PD1/PD0 bits in the control byte: STBYPD (standby) draws ≤850µA and keeps the reference buffer active for zero-startup-delay wake-up, while FULLPD draws ≤220µA and disables all analog circuitry except SHDN detection. Hardware shutdown (SHDN pin low) forces FULLPD regardless of software setting. Both modes retain register contents and require no recalibration on wake-up.
Is the MAX1270AEAI/GH9 pin-compatible with other members of the MAX1270/MAX1271 family?
Yes, the MAX1270AEAI/GH9 shares identical 28-pin SSOP pinout and electrical behavior with all MAX1270x and MAX1271x variants in the same package (e.g., MAX1270BCAI, MAX1271AEAI). Differences are limited to grade (A/B), temperature range (C/E), and internal specifications (INL, gain error); no PCB layout changes are needed when substituting within the same package and grade family - only firmware range/configuration updates may be required for MAX1271 variants due to VREF-relative scaling.
MAX1270AEAI/GH9 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 110k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- 3-Wire, Microwire, QSPI, SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1270AEAI/GH9 FAQ
1.How can I place an order for MAX1270AEAI/GH9 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1270AEAI/GH9 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX1270AEAI/GH9 reliable?
The price and inventory of MAX1270AEAI/GH9 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1270AEAI/GH9 is usually 5 days.
3.What payment methods are accepted for MAX1270AEAI/GH9?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1270AEAI/GH9 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1270AEAI/GH9?
MAX1270AEAI/GH9 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1270AEAI/GH9 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX1270AEAI/GH9?
For technical support, including MAX1270AEAI/GH9 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1270AEAI/GH9 requirements.
6.How does Aetrix verify that MAX1270AEAI/GH9 is sourced from the original manufacturer or authorized distributors?
All MAX1270AEAI/GH9 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX1270AEAI/GH9 meets industry standards.
7.What is the process for return or replacement of MAX1270AEAI/GH9?
All MAX1270AEAI/GH9 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1270AEAI/GH9, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX1270AEAI/GH9 part is unused and in its original packaging.
Return procedure for MAX1270AEAI/GH9:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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