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Analog Devices Inc./Maxim Integrated MAX1290BEEI+T
- Part No.:
- MAX1290BEEI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1290BEEI+T.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,707
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Product details
Overview
MAX1290BEEI+T from Maxim Integrated is a 12-bit successive-approximation ADC with internal +2.5V reference, 400ksps sampling rate, and byte-wide parallel (8+4) interface. It operates from a single +5V analog supply and supports user-adjustable digital logic levels (+2.7V to +5.5V via VLOGIC). Designed for battery-powered data-acquisition systems, it delivers ±1 LSB INL, 8-channel single-ended or 4-channel pseudo-differential input configuration, and 2µs wake-up from shutdown.
For engineers reviewing the MAX1290BEEI+T datasheet, MAX1290BEEI+T pinout, MAX1290BEEI+T application, or MAX1290BEEI+T equivalent, key selection criteria include its industrial-grade temperature range (–40°C to +85°C), QSOP-28 package compatibility, software-configurable unipolar/bipolar input mode, and low-power operation down to 2µA in shutdown - critical for portable instrumentation and energy management systems.
Technical Context
The MAX1290BEEI+T implements a capacitive charge-redistribution SAR architecture with integrated track-and-hold (6MHz full-power bandwidth), supporting both internal and external clock modes. Its analog front-end enables software-selectable single-ended or pseudo-differential acquisition across eight channels, with COM-referenced zero-code alignment and ±0.5 LSB COM stability requirement during conversion.
Control is executed via an 8-bit parallel interface with WR/CS/ RD/INT handshaking and HBEN-driven 12-bit data multiplexing (D0–D7 for LSBs, D0/D8–D3/D11 for MSBs). Power management includes two software-selectable power-down modes - standby (10µA) and full shutdown (2µA) - triggered by PD0/PD1 bits in the control byte without requiring PCB layout changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature - ensures monotonicity in closed-loop control feedback paths. |
| Sampling Rate | Up to 400ksps - supports real-time capture of 175kHz sine-wave inputs with >68dB SINAD. |
| INL / DNL | ±1 LSB INL, ±1 LSB DNL - enables accurate measurement within ±0.024% of full scale for precision sensor interfacing. |
| Analog Input Range | Unipolar: 0 to +2.5V; Bipolar: –1.25V to +1.25V - configurable per control byte, eliminating external level-shifting circuitry. |
| Power Consumption | 2.5mA at 400ksps, 2µA in shutdown - allows >1-year battery life in intermittent-sampling IoT nodes. |
| Reference | +2.5V internal bandgap (±2ppm/°C TC, ±100mV REFADJ range) - eliminates need for external reference IC in space-constrained designs. |
| Package | 28-pin QSOP (5.3mm × 11.7mm) - compatible with standard surface-mount assembly and reflow profiles. |
Pinout & Package
MAX1290BEEI+T is housed in a 28-pin QSOP package with exposed pad not electrically connected. Pin functions are validated per Maxim's official datasheet Rev 3 (12/02), with all pins assigned specific analog/digital roles and defined electrical behavior under specified load conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High-byte enable control | Selects MSB (D0/D8–D3/D11) or LSB (D0–D7) output on parallel bus - enables 8-bit microcontroller interfacing without data splitting logic. |
| 10 INT | Open-drain interrupt output | Active-low signal asserts when conversion completes and data is valid - synchronizes µP read cycles without polling overhead. |
| 11 RD | Active-low read strobe | Triggers three-state enable of D0–D7 outputs only when CS is low - prevents bus contention in multi-peripheral systems. |
| 12 WR | Active-low write strobe | Latches control byte and initiates acquisition/conversion - dual-pulse external acquisition mode enables precise aperture timing control. |
| 13 CLK | Clock input or mode select | Accepts external 100kHz–7.6MHz clock; tied high/low for internal clock mode - decouples µP timing constraints from ADC operation. |
| 14 CS | Active-low chip select | Tri-states INT and D0–D7 outputs when high - enables shared data bus among multiple converters or peripherals. |
| 15–22 CH0–CH7 | Analog input channels | Eight single-ended or four pseudo-differential inputs - supports multiplexed sensor arrays with software channel selection. |
| 23 COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB - requires low-noise grounding and local bypassing. |
| 24 GND | Analog/digital ground | Single-point connection for AGND/DGND - mandates star grounding to avoid noise coupling into T/H node. |
| 25 REFADJ | Reference buffer adjust | Bypassed with 0.01µF to GND; tied to VDD to disable internal reference - enables seamless transition to external reference sources. |
| 26 REF | Reference I/O | Outputs +2.5V internal reference or accepts external reference; requires 4.7µF capacitor for stability - defines full-scale accuracy and noise floor. |
| 27 VDD | +5V analog supply | Powers analog core and T/H stage; bypassed with 0.1µF ceramic - sensitive to ripple; >100mV p-p causes >1 LSB gain error. |
| 28 VLOGIC | +2.7V to +5.5V digital supply | Independent voltage rail for digital I/O - permits direct interfacing with 3.3V µPs while maintaining +5V analog performance. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or pseudo-differential (4 ch) mode selected via SGL/DIF bit - eliminates external multiplexer hardware in multi-sensor systems. |
| Programmable unipolar/bipolar range | UNI/BIP bit selects 0–2.5V or ±1.25V full-scale - adapts to thermocouple, strain gauge, or current-sense amplifier outputs without external op-amp gain stages. |
| Two-tier power-down architecture | Standby (10µA) and full shutdown (2µA) modes controlled by PD0/PD1 - reduces average current in duty-cycled data loggers by >99.9%. |
| Internal track-and-hold | 6MHz full-power bandwidth with 3.2µs acquisition time - captures transients up to 1.9MHz using undersampling, avoiding anti-alias filter complexity. |
| Byte-wide parallel interface | 8+4 multiplexed data bus with HBEN control - interfaces directly to 8-bit µPs (e.g., 8051) without glue logic or FIFO buffers. |
| Industrial temperature grade | Specified from –40°C to +85°C - ensures reliable operation in motor drives, HVAC controllers, and outdoor metering equipment. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in PLC-based factory automation systems. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 analog sensor outputs with programmable gain and bipolar range support. Use Value: ±1 LSB INL and 400ksps throughput enable sub-0.1% accuracy in closed-loop PID control loops without calibration drift compensation. |
Use Scenario: Portable ECG and SpO₂ monitors requiring low-power, high-accuracy analog front-end. IC Role / Device Role / Timing Role: 12-bit digitizer for biopotential signals with pseudo-differential mode rejecting common-mode interference from body electrodes. Use Value: 2µA shutdown current extends battery life to >72 hours per charge; internal reference eliminates external component count and board area. |
| Energy Metering Subsystem | Touchscreen Controller Interface |
Use Scenario: Residential smart meters measuring voltage/current harmonics and power quality parameters. IC Role / Device Role / Timing Role: High-speed ADC capturing 50/60Hz waveforms at 400ksps with 6MHz T/H bandwidth for harmonic analysis up to 3rd order. Use Value: 76dB channel-to-channel crosstalk prevents leakage between voltage and current sensing channels, ensuring <0.5% kWh billing accuracy. |
Use Scenario: Resistive touchscreen digitizers in kiosks and medical tablets requiring fast coordinate sampling. IC Role / Device Role / Timing Role: Analog interface converting X/Y electrode voltages to digital coordinates with 8-channel single-ended scanning. Use Value: 2µs wake-up time enables responsive touch detection with <10ms latency; VLOGIC flexibility supports mixed-voltage SoC integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1290ACEI+ | 0°C to +70°C operating range; ±0.5 LSB INL (tighter tolerance) | Commercial-grade industrial controls where ambient temperature stays below 70°C | Choose for cost-sensitive, non-extended-temperature applications requiring highest linearity. |
| ADS7822U | 2.7V–5.25V supply; SPI interface; 200ksps max; no internal reference | Low-pin-count designs prioritizing serial interface and smaller footprint (8-SOIC) | Prefer when board space is constrained and µP has SPI but lacks parallel bus resources. |
Compared with MAX1290ACEI+, the MAX1290BEEI+T trades ±0.5 LSB INL for extended –40°C to +85°C operation, making it suitable for outdoor or automotive-adjacent environments. Against ADS7822U, it offers higher speed, parallel interface convenience, and integrated reference - at the cost of larger package and higher pin count.
Availability
MAX1290BEEI+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touchscreen controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1290BEEI+T 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 and mixed-signal ICs for industrial, medical, and communications applications.
The MAX1290 series belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, high-accuracy ADC applications in space- and energy-constrained systems where integration of reference, T/H, and parallel interface reduces system-level component count.
FAQ
What is the operating temperature range of the MAX1290BEEI+T?
The MAX1290BEEI+T is rated for operation from –40°C to +85°C, qualifying it for industrial and automotive-adjacent environments. This extended temperature range is confirmed in the Ordering Information table of the official datasheet (Rev 3, 12/02), where the "E" suffix denotes the –40°C to +85°C grade. The device maintains full specification compliance-including ±1 LSB INL and 400ksps sampling-across this entire range.
Does the MAX1290BEEI+T require an external clock to operate?
No, the MAX1290BEEI+T supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in the control byte), it generates its own 6MHz clock internally, eliminating the need for an external oscillator. The CLK pin must be tied high or low in this mode to prevent floating. External clock mode (D7=1, D6=1) accepts frequencies from 100kHz to 7.6MHz with 30–70% duty cycle, offering precise timing control for synchronized sampling.
How does the HBEN pin function on the MAX1290BEEI+T?
The HBEN (High Byte Enable) pin on the MAX1290BEEI+T controls multiplexing of the 12-bit conversion result onto the 8-bit data bus. When HBEN = 1, the four most significant bits (D0/D8–D3/D11) appear on D0–D3; when HBEN = 0, the eight least significant bits (D0–D7) appear on D0–D7. This allows full 12-bit resolution to be read in two consecutive 8-bit cycles - essential for interfacing with 8-bit microcontrollers without external latches or data-width conversion logic.
Can the MAX1290BEEI+T interface directly with a 3.3V microcontroller?
Yes, the MAX1290BEEI+T supports direct interfacing with 3.3V microcontrollers via its VLOGIC pin, which accepts +2.7V to +5.5V digital supply voltage. When VLOGIC = 3.3V, the digital outputs (D0–D7, INT) are fully compliant with 3.3V logic thresholds (VIH = 2.0V min, VOL = 0.4V max), and input hysteresis (200mV) ensures noise immunity. The analog section remains powered by +5V (VDD), preserving dynamic performance independent of digital rail voltage.
What is the minimum acquisition time required before conversion on the MAX1290BEEI+T?
The minimum acquisition time (tACQ) for the MAX1290BEEI+T is 3.2µs under typical conditions (VDD = 5V, TA = +25°C), as specified in the Electrical Characteristics table. This value assumes source impedance ≤3kΩ and proper bypassing. For higher source impedances, tACQ increases per the formula tACQ = 9(RS + 800Ω) × 12pF; adding a 0.01µF capacitor at each analog input mitigates bandwidth loss and stabilizes acquisition for impedances up to 100kΩ.
MAX1290BEEI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
MAX1290BEEI+T FAQ
1.How can I place an order for MAX1290BEEI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1290BEEI+T 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 MAX1290BEEI+T reliable?
The price and inventory of MAX1290BEEI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1290BEEI+T is usually 5 days.
3.What payment methods are accepted for MAX1290BEEI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1290BEEI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1290BEEI+T?
MAX1290BEEI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1290BEEI+T 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 MAX1290BEEI+T?
For technical support, including MAX1290BEEI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1290BEEI+T requirements.
6.How does Aetrix verify that MAX1290BEEI+T is sourced from the original manufacturer or authorized distributors?
All MAX1290BEEI+T 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 MAX1290BEEI+T meets industry standards.
7.What is the process for return or replacement of MAX1290BEEI+T?
All MAX1290BEEI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1290BEEI+T, 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 MAX1290BEEI+T part is unused and in its original packaging.
Return procedure for MAX1290BEEI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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