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Analog Devices Inc./Maxim Integrated MAX1290AEEI+
- Part No.:
- MAX1290AEEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1290AEEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
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Product details
Overview
MAX1290AEEI+ from Maxim Integrated is a 12-bit successive-approximation ADC with integrated +2.5V reference, 8-channel single-ended / 4-channel pseudo-differential analog input multiplexer, byte-wide parallel (8+4) interface, and -40°C to +85°C industrial temperature range. It operates from a single +5V analog supply while supporting digital logic levels from +2.7V to +5.5V via VLOGIC, enabling direct interfacing with mixed-voltage microcontrollers in portable data-acquisition systems.
For engineers reviewing the MAX1290AEEI+ datasheet, MAX1290AEEI+ pinout, MAX1290AEEI+ application, or MAX1290AEEI+ equivalent, this page delivers verified electrical specs, validated QSOP-28 pin functions, confirmed dynamic performance at 400ksps, and real-world selection guidance for low-power, space-constrained measurement designs.
Technical Context
The MAX1290AEEI+ implements a capacitive charge-redistribution SAR architecture with an internal track-and-hold stage offering 6MHz full-power bandwidth and 350kHz full-linear bandwidth. Its control byte (D7–D0) configures acquisition mode (internal/external), unipolar/bipolar input range, single-ended/pseudo-differential operation, channel selection (CH0–CH7), and power-down states.
Conversion timing is clock-dependent: 13 cycles per conversion at 7.6MHz external clock yields 400ksps max rate; internal clock mode fixes conversion time at 3.6µs. The HBEN pin enables high-byte (D8–D11) or low-byte (D0–D7) multiplexing on the shared 8-bit data bus, reducing I/O count without sacrificing 12-bit resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 = 610µV step size with ±0.5 LSB INL for accurate sensor digitization. |
| Max Sampling Rate | 400ksps - supports real-time capture of signals up to 200kHz Nyquist bandwidth with undersampling capability. |
| Analog Input Channels | 8 single-ended or 4 pseudo-differential - enables multi-sensor monitoring (e.g., thermocouples, RTDs, voltage rails) without external MUX. |
| Reference | +2.5V internal bandgap - eliminates external reference component, with ±2ppm/°C TC and ±100mV REFADJ adjust range. |
| Power Consumption | 2.5mA at 400ksps, 2µA in shutdown - enables battery operation >1 year in intermittent logging applications. |
| Interface | Byte-wide parallel (8+4) with CS/WR/RD/INT - directly connects to 8-bit µP buses; HBEN allows 12-bit reads in two cycles. |
| Supply Range | VDD = +4.5V to +5.5V; VLOGIC = +2.7V to +5.5V - supports mixed-voltage system integration with 3.3V or 5V controllers. |
Pinout & Package
MAX1290AEEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for compact PCB layouts in portable instrumentation and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High-Byte Enable | Selects D8–D11 (HBEN=1) or D0–D7 (HBEN=0) on shared data bus - enables 12-bit read using standard 8-bit µP port. |
| 2–9 D7–D0/D11–D8 | Three-State Data Bus | Bidirectional 8-bit bus carrying LSBs (D0–D7) or MSBs (D8–D11); tri-stated when CS high - prevents bus contention during idle. |
| 10 INT | Interrupt Output | Active-low signal asserts when conversion completes and data is valid - triggers µP ISR without polling overhead. |
| 11 RD | Read Strobe | Falling edge latches conversion result onto data bus - synchronizes µP read timing with ADC output enable. |
| 12 WR | Write Strobe | Rising edge loads control byte (channel, mode, power-down) and initiates acquisition/conversion - defines sampling instant in external acquisition mode. |
| 13 CLK | Clock Input | Accepts 100kHz–7.6MHz external clock; tied to VDD/GND for internal clock mode - decouples timing control from host processor. |
| 14 CS | Chip Select | Active-low enables device; tri-states INT and D7–D0 when high - allows multiple ADCs on same data bus. |
| 15–22 CH7–CH0 | Analog Input Channels | Single-ended inputs referenced to COM; support pseudo-differential pairs (e.g., CH0/CH1) - accommodates grounded or floating sensors. |
| 23 COM | Analog Common | Zero-code reference for single-ended mode; must be stable to ±0.5 LSB during conversion - requires low-noise, low-impedance connection. |
| 24 GND | Analog/Digital Ground | Common return for VDD, VLOGIC, REF, and analog inputs - split-plane layout recommended to minimize noise coupling. |
| 25 REFADJ | Reference Adjust | Bypass to GND with 0.01µF capacitor; connect to VDD to disable internal reference when using external REF - enables precision external reference option. |
| 26 REF | Reference I/O | Outputs +2.5V internal reference; accepts external reference when REFADJ = VDD - 4.7µF capacitor required for internal REF stability. |
| 27 VDD | Analog Supply | +4.5V to +5.5V analog power; bypass with 0.1µF ceramic capacitor - powers T/H, SAR core, and reference circuitry. |
| 28 VLOGIC | Digital Supply | +2.7V to +5.5V logic supply; sets output voltage levels for D7–D0 and INT - enables direct interface with 3.3V µPs without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or pseudo-differential (4 ch) mode selected via control byte - eliminates external analog switches for multi-sensor systems. |
| Dynamic power scaling | Current drops from 2.5mA (400ksps) to 2µA (shutdown) - extends battery life in wake-on-event sensor nodes. |
| Integrated reference with trim capability | +2.5V ±0.5% initial accuracy, ±2ppm/°C TC, and ±100mV REFADJ range - reduces BOM cost and improves system-level accuracy vs. discrete references. |
| Flexible clocking architecture | Internal clock (3.6µs fixed conversion) or external clock (100kHz–7.6MHz) - balances µP resource usage and timing precision. |
| Low aperture jitter | 50ps typical (external acquisition mode) - preserves SNR >67dB at 50kHz input frequency for high-fidelity signal capture. |
| Robust analog input protection | Clamps to GND–300mV / VDD+300mV; limits off-channel current to 4mA - withstands transient overvoltage without external diodes. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of 8 temperature, pressure, and flow sensors in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: 12-bit ADC digitizing analog sensor outputs with software-selectable unipolar/bipolar ranges and automatic power-down between scans. Use Value: Single-chip solution replaces discrete MUX + ADC + reference, reducing board area by 40% and eliminating calibration drift from external components. |
Use Scenario: Portable ECG/SpO₂ monitor acquiring biopotential signals from 4 electrode pairs with high common-mode rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC capturing differential lead signals (e.g., LA–RA) while rejecting 50/60Hz mains interference via COM-referenced design. Use Value: ±0.5 LSB INL and 67dB SINAD ensure diagnostic-grade waveform fidelity; 2.5mA active current enables >8hr battery runtime. |
| Energy Meter Data Logging | Touchscreen Controller Interface |
Use Scenario: Smart meter recording voltage/current waveforms at 400ksps for harmonic analysis and power quality reporting. IC Role / Device Role / Timing Role: High-speed ADC sampling isolated AC line signals through precision resistive dividers, synchronized to µP timer interrupts. Use Value: 6MHz full-power bandwidth supports undersampling of 50kHz harmonics; internal reference ensures consistent gain across meter fleet. |
Use Scenario: Resistive touchscreen controller measuring X/Y coordinate voltages from 4-wire overlay with fast response to finger touch. IC Role / Device Role / Timing Role: 8-channel ADC scanning X+ X− Y+ Y− electrodes in sequence, using internal acquisition mode for deterministic 3.6µs conversion latency. Use Value: Hardware-controlled channel sequencing via control byte eliminates µP polling delay; 28-QSOP footprint fits tight display bezel space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | 8-channel, 12-bit, SPI interface; no internal reference; 200ksps max rate; SOIC-8 package | Requires external reference and µP SPI peripheral; lower sampling rate limits high-frequency signal capture | Choose for cost-sensitive, low-pin-count designs where SPI is preferred and 400ksps is not required. |
| MAX11607EEE+ | 8-channel, 12-bit, I²C interface; internal reference; 100ksps max rate; 16-QSOP package | I²C bus sharing simplifies wiring but adds protocol overhead; slower rate suits slow-varying sensor inputs only | Choose for systems with existing I²C infrastructure and moderate throughput needs (e.g., environmental monitoring). |
Compared with MAX1290AEEI+, ADS7816U trades parallel speed for smaller footprint and serial simplicity, while MAX11607EEE+ sacrifices sampling rate for I²C compatibility and reduced GPIO usage - neither matches the MAX1290AEEI+'s combination of 400ksps, integrated reference, and flexible analog input configuration in a single 28-pin package.
Availability
MAX1290AEEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, and energy metering applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1290AEEI+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX1290/MAX1292 family was designed for low-power, space-constrained data-acquisition systems requiring integrated reference, flexible input configuration, and direct µP interfacing - targeting battery-operated test equipment and distributed sensor networks.
FAQ
What is the operating temperature range of the MAX1290AEEI+?
The MAX1290AEEI+ is rated for -40°C to +85°C operation, making it suitable for industrial environments, outdoor instrumentation, and automotive under-hood applications where thermal stability is critical. This extended temperature grade is confirmed in the ordering information table, distinguishing it from the 0°C to +70°C MAX1290ACEI variant.
Does the MAX1290AEEI+ require an external clock to operate?
No - the MAX1290AEEI+ supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own 7.6MHz clock, fixing conversion time at 3.6µs. The CLK pin must be tied to VDD or GND in this mode to prevent floating.
How does the HBEN pin function in the MAX1290AEEI+?
The HBEN (High-Byte Enable) pin controls multiplexing of the 12-bit conversion result onto the 8-bit data bus: when HBEN=1, D0–D7 carry D8–D11 (MSBs); when HBEN=0, D0–D7 carry D0–D7 (LSBs). This allows full 12-bit reads using two consecutive µP bus cycles without requiring a 12-bit port.
Can the MAX1290AEEI+ interface directly with a 3.3V microcontroller?
Yes - the MAX1290AEEI+ features a dedicated VLOGIC pin that accepts +2.7V to +5.5V, allowing its digital outputs (D7–D0, INT) to swing to 3.3V logic levels when VLOGIC = 3.3V. This eliminates level-shifting components when interfacing with modern 3.3V µPs.
What is the maximum analog input voltage range for the MAX1290AEEI+ in unipolar mode?
In unipolar mode with internal +2.5V reference, the MAX1290AEEI+ accepts analog inputs from 0V to +2.5V (single-ended) or -1.25V to +1.25V (bipolar). Absolute input limits are GND–300mV to VDD+300mV for fault protection, but full-scale accuracy requires staying within GND–50mV to VDD+50mV.
MAX1290AEEI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 4, 8
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- Parallel
- 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:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1290AEEI+ FAQ
1.How can I place an order for MAX1290AEEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1290AEEI+ 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 MAX1290AEEI+ reliable?
The price and inventory of MAX1290AEEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1290AEEI+ is usually 5 days.
3.What payment methods are accepted for MAX1290AEEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1290AEEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1290AEEI+?
MAX1290AEEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1290AEEI+ 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 MAX1290AEEI+?
For technical support, including MAX1290AEEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1290AEEI+ requirements.
6.How does Aetrix verify that MAX1290AEEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1290AEEI+ 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 MAX1290AEEI+ meets industry standards.
7.What is the process for return or replacement of MAX1290AEEI+?
All MAX1290AEEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1290AEEI+, 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 MAX1290AEEI+ part is unused and in its original packaging.
Return procedure for MAX1290AEEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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