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Analog Devices Inc./Maxim Integrated MAX1290ACEI+
- Part No.:
- MAX1290ACEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1290ACEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
MAX1290ACEI+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, byte-wide parallel (8+4) interface, and software-configurable 8-channel single-ended or 4-channel pseudo-differential input multiplexer. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC, enabling direct interfacing with mixed-voltage microprocessors in portable data-acquisition systems.
For engineers reviewing the MAX1290ACEI+ datasheet, MAX1290ACEI+ pinout, MAX1290ACEI+ application, or MAX1290ACEI+ equivalent, this device delivers verified 400ksps sampling at 2.5mA supply current, ±0.5 LSB INL, 6MHz full-power bandwidth, and 2µs wake-up from shutdown - critical for battery-powered industrial sensors and patient monitoring front-ends.
Technical Context
The MAX1290ACEI+ implements a charge-redistribution SAR architecture with an internal track-and-hold stage, supporting both internal and external clock modes (7.6MHz max) and internal/external acquisition control via configurable ACQMOD bit. Its analog input structure enables unipolar/bipolar operation and precise channel selection through an 8-bit control byte including address bits A2–A0 and SGL/DIF/UNI/BIP configuration.
Power management is handled via two software-selectable power-down modes: standby (≤10µA) and full shutdown (≤2µA), triggered by PD0/PD1 bits. The device tri-states INT on CS high and uses HBEN to multiplex 12-bit output across an 8-bit data bus, reducing I/O count while preserving resolution integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precision measurement of analog sensor outputs. |
| Sampling Rate | 400ksps - supports real-time capture of fast transients in motor control feedback or energy metering. |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error over temperature for calibrated systems. |
| Supply Current | 2.5mA at 400ksps - enables low-power operation in always-on IoT edge nodes without thermal derating. |
| Reference | +2.5V internal - eliminates need for external reference IC, reducing BOM count and layout area in space-constrained designs. |
| Input Channels | 8 single-ended / 4 pseudo-differential - provides flexible signal routing for multi-sensor industrial PLC modules. |
| Full-Power Bandwidth | 6MHz - allows undersampling of RF or ultrasonic signals beyond Nyquist, simplifying anti-alias filter design. |
Pinout & Package
MAX1290ACEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for high-density PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HBEN | High-byte enable control | Selects MSB (D8–D11) or LSB (D0–D7) output on shared 8-bit bus - reduces microcontroller I/O requirements. |
| D0/D8–D7/D11 | Three-state bidirectional data bus | Byte-multiplexed 12-bit result delivery - avoids need for 12-bit wide parallel interface on host processor. |
| INT | Interrupt output | Active-low conversion-complete flag - enables efficient polling-free firmware with deterministic latency. |
| WR, RD, CS | Parallel interface controls | Standard µP-compatible strobes - no custom timing logic required for integration with 8051, ARM Cortex-M, or FPGA controllers. |
| CH0–CH7 | Analog input channels | Software-selected inputs with ±0.5 LSB COM stability requirement - mandates low-noise grounding for accurate multi-channel sequencing. |
| VLOGIC | Digital supply rail | Independent +2.7V to +5.5V logic supply - decouples ADC digital noise from analog VDD, improving PSR performance. |
| REF, REFADJ | Reference buffer terminals | Internal +2.5V reference with 4.7µF bypass - eliminates external reference but requires stable capacitor placement near REF pin. |
| COM | Analog ground reference | Zero-code reference point for single-ended mode - must be isolated from noisy digital GND to maintain ±0.5 LSB offset matching. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended (8 ch) or pseudo-differential (4 ch) selection via control byte - eliminates hardware jumpers and enables runtime reconfiguration. |
| Auto power-down between conversions | Reduces supply current to <10µA at reduced sampling rates - extends battery life in wireless sensor nodes without sacrificing wake-up speed. |
| Fast wake-up time | 2µs exit from shutdown - meets tight timing windows in closed-loop control systems requiring rapid response to fault events. |
| Internal track-and-hold | 6MHz full-power bandwidth - captures fast-rising pulses from piezoelectric sensors or encoders without external T/H circuitry. |
| Tri-state INT output | Automatic high-impedance state when CS is high - prevents bus contention in multi-peripheral systems sharing interrupt lines. |
Applications
| Industrial Control Systems | Data Logging |
|---|---|
Use Scenario: Monitoring temperature, pressure, and current in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Primary 12-bit ADC digitizing 8 sensor channels with synchronized sampling and interrupt-driven data transfer. Use Value: ±0.5 LSB INL and 400ksps throughput ensure accurate closed-loop control of servo drives and valve actuators within 1ms cycle times. |
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and light intensity over weeks. IC Role / Device Role / Timing Role: Low-power ADC managing duty-cycled sampling and automatic shutdown between measurements. Use Value: 2µA shutdown current and 2µs wake-up enable >1-year battery life using CR2032 while maintaining sub-0.1°C measurement fidelity. |
| Energy Management | Patient Monitoring |
Use Scenario: Smart electricity meter measuring voltage, current, and power factor in residential utility meters. IC Role / Device Role / Timing Role: High-accuracy ADC capturing waveform samples at 400ksps for harmonic analysis and RMS calculation. Use Value: 6MHz full-power bandwidth and 70dB SINAD support IEC 62053-compliant Class 0.5 metering accuracy under distorted grid conditions. |
Use Scenario: Portable ECG monitor acquiring lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC rejecting common-mode noise from electrode contact impedance variations. Use Value: Software-selectable bipolar mode (±1.25V range) and 80dB SFDR preserve QRS complex morphology for arrhythmia detection algorithms. |
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 |
|---|---|---|---|
| MAX1291ACEI+ | +3V supply only; identical pinout and feature set but lower VDD range (2.7V–3.6V) | Suitable for ultra-low-power 3.3V systems where 5V rails are unavailable | Choose MAX1291ACEI+ only if system lacks +5V analog supply and board layout permits voltage scaling. |
| ADS7822U | Serial SPI interface (not parallel); 2.7V–5.25V supply; 200ksps max; no internal reference | Requires external reference and microcontroller SPI resources; smaller 8-pin SOIC footprint | Select ADS7822U when PCB space is constrained and serial interface simplifies routing over dense 12-bit parallel buses. |
Compared with MAX1291ACEI+, the MAX1290ACEI+ offers higher supply voltage tolerance and direct compatibility with legacy 5V µPs; versus ADS7822U, it trades interface simplicity for deterministic parallel read timing and integrated reference - critical for real-time deterministic systems.
Availability
MAX1290ACEI+ is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and energy metering applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX1290ACEI+ 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 MAX1290ACEI+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for battery-powered and space-constrained applications demanding low power, small footprint, and integrated reference functionality.
FAQ
What is the operating temperature range for MAX1290ACEI+?
The MAX1290ACEI+ is specified for commercial-grade operation from 0°C to +70°C. This range is validated per the device's Absolute Maximum Ratings and Electrical Characteristics tables, ensuring guaranteed performance in office environments, consumer electronics, and non-automotive industrial enclosures. The MAX1290ACEI+ variant does not support extended -40°C to +85°C operation - that capability is reserved for the MAX1290AEEI+ and MAX1290BEEI+ versions.
Does MAX1290ACEI+ require an external clock source?
No, the MAX1290ACEI+ supports both internal and external clock modes. When configured for internal clock operation (D7=1, D6=0 in control byte), it generates its own 7.6MHz conversion clock, eliminating external oscillator components. The CLK pin must be tied to VDD or GND in this mode to prevent floating. External clock mode (D7=1, D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals for precise timing control in synchronous systems.
How does the HBEN pin function on MAX1290ACEI+?
The HBEN (High-Byte Enable) pin on MAX1290ACEI+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus: when HBEN = 1, D0–D7 carry D8–D11 (MSB nibble); when HBEN = 0, D0–D7 carry D0–D7 (LSB nibble). This allows full 12-bit resolution to be read in two consecutive 8-bit cycles without requiring a wider bus, conserving microcontroller I/O pins and PCB traces.
Can MAX1290ACEI+ operate with a 3.3V digital supply?
Yes, MAX1290ACEI+ supports digital logic supplies from +2.7V to +5.5V via the VLOGIC pin, making it fully compatible with 3.3V microcontrollers. The analog supply (VDD) remains fixed at +5V ±10%, but VLOGIC can be independently set to 3.3V. This dual-supply flexibility ensures clean digital interfacing without level shifters while maintaining optimal analog performance and PSR specifications.
What is the maximum analog input voltage range for MAX1290ACEI+ in unipolar mode?
In unipolar mode, the MAX1290ACEI+ accepts analog input voltages from 0V to VREF (2.5V), yielding a full-scale range of 0V to +2.5V. This is confirmed in the Electrical Characteristics table under "Analog Input Voltage Range" with condition "Unipolar, VCOM = 0". Exceeding +2.5V or going below 0V risks code saturation or damage if input clamping diodes conduct - absolute limits are GND − 0.3V to VDD + 0.3V per Absolute Maximum Ratings.
MAX1290ACEI+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1290ACEI+ FAQ
1.How can I place an order for MAX1290ACEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1290ACEI+ 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 MAX1290ACEI+ reliable?
The price and inventory of MAX1290ACEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1290ACEI+ is usually 5 days.
3.What payment methods are accepted for MAX1290ACEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1290ACEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1290ACEI+?
MAX1290ACEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1290ACEI+ 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 MAX1290ACEI+?
For technical support, including MAX1290ACEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1290ACEI+ requirements.
6.How does Aetrix verify that MAX1290ACEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1290ACEI+ 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 MAX1290ACEI+ meets industry standards.
7.What is the process for return or replacement of MAX1290ACEI+?
All MAX1290ACEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1290ACEI+, 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 MAX1290ACEI+ part is unused and in its original packaging.
Return procedure for MAX1290ACEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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