My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1290BEEI
- Part No.:
- MAX1290BEEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1290BEEI.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,927
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1290BEEI 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 MAX1290BEEI datasheet, MAX1290BEEI pinout, MAX1290BEEI application, or MAX1290BEEI equivalent, this device is selected for battery-powered instrumentation requiring 400ksps sampling, ±0.5 LSB INL, <2µs wake-up from shutdown, and on-chip track/hold with 6MHz full-power bandwidth - all in a -40°C to +85°C industrial temperature grade 28-pin QSOP package.
Technical Context
The MAX1290BEEI implements a charge-redistribution SAR architecture with an internal 6MHz-track/hold stage, supporting both internal and external clock modes. Its control byte (D7–D0) configures acquisition mode (internal/external), unipolar/bipolar range, single-ended/pseudo-differential input topology, and channel selection (CH0–CH7).
It features dual power-down modes: standby (≤10µA) and full shutdown (≤2µA), activated via PD0/PD1 bits. The HBEN pin enables high-byte (D8–D11) or low-byte (D0–D7) multiplexing on the shared data bus, while INT asserts low upon conversion completion and remains active until RD or a new WR cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise measurement of small signal changes. |
| Sampling Rate | 400ksps max - supports real-time capture of signals up to 200kHz Nyquist bandwidth without undersampling constraints. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and ≤0.012% full-scale linearity error across temperature (-40°C to +85°C). |
| Reference | +2.5V internal - eliminates need for external reference IC; TCREF = ±2ppm/°C ensures stable scaling over industrial temperature range. |
| Power Consumption | 2.5mA at 400ksps - translates to 10mW total dissipation (VDD = VLOGIC = +5V), enabling >100hr operation on a 200mAh Li-ion cell. |
| Analog Input Range | 0 to +2.5V (unipolar) or ±1.25V (bipolar) - matches standard sensor output ranges and simplifies front-end conditioning. |
| Package | 28-pin QSOP - 7.6mm × 10.2mm footprint with 0.635mm pitch, compatible with automated SMT assembly and IPC-7351B land patterns. |
Pinout & Package
MAX1290BEEI is housed in a 28-pin QSOP package with exposed pad (no thermal pad connection required). Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High-Byte Enable | Selects MSB nibble (D8–D11) vs. LSB byte (D0–D7) on shared data bus - essential for 12-bit read sequencing in 8-bit microcontroller interfaces. |
| 10 INT | Interrupt Output | Active-low open-drain flag signaling conversion completion; tri-states when CS = high - enables interrupt-driven firmware polling without bus contention. |
| 11 RD / 12 WR | Read/Write Control | Asynchronous active-low strobes; RD latches parallel data, WR loads configuration byte and triggers acquisition - no address bus needed. |
| 13 CLK | Clock Input/Output | Configurable as external clock input or internal oscillator enable (tie to VDD/GND); supports 100kHz–7.6MHz with 30–70% duty cycle. |
| 14 CS | Chip Select | Active-low enable; places D0–D7 and INT into high-impedance state when deasserted - allows multiple ADCs on same data bus. |
| 22–15 CH0–CH7 | Analog Input Channels | Single-ended inputs referenced to COM; internally multiplexed under software control - supports 8 independent sensor inputs per conversion sequence. |
| 23 COM | Common Reference | Zero-code reference point for single-ended mode; must be stable to ±0.5 LSB during conversion - requires low-noise, low-impedance grounding. |
| 26 REF | Reference Buffer Output | Provides regulated +2.5V; requires 4.7µF bypass capacitor to GND - sets full-scale range and directly impacts gain accuracy and THD. |
| 27 VDD / 28 VLOGIC | Analog/Digital Supplies | VDD powers analog core (+5V ±10%); VLOGIC independently sets digital I/O voltage (+2.7V to +5.5V) - enables interfacing with 3.3V or 5V controllers without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime selection between 8-channel single-ended or 4-channel pseudo-differential mode via control byte - eliminates hardware rework for varying sensor types (e.g., thermocouples vs. RTDs). |
| Auto power-down with fast wake-up | Shuts down to <2µA between conversions; resumes full operation in 2µs - critical for duty-cycled sensor nodes where average current dictates battery life. |
| Internal track/hold with 6MHz bandwidth | Eliminates need for external sample-and-hold IC; captures transients up to 6MHz without aperture distortion - enables accurate undersampling of RF or motor-control signals. |
| Tri-state parallel interface (8+4) | Shares D0–D7 bus with microcontroller data lines; HBEN controls MSB/LSB multiplexing - reduces PCB routing complexity versus serial interfaces in space-constrained designs. |
| Industrial temperature grade | Specified from -40°C to +85°C with guaranteed ±0.5 LSB INL and ±1 LSB DNL - ensures metrology-grade accuracy in factory automation and outdoor monitoring equipment. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of pressure, temperature, and flow sensors in PLC-based control cabinets operating in unconditioned environments. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 analog sensor outputs at 100ksps with bipolar input support for differential pressure bridges. Use Value: On-chip +2.5V reference and ±0.5 LSB INL eliminate calibration drift over temperature, reducing field maintenance intervals by 40% compared to reference-less ADCs. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals with low noise and high common-mode rejection. IC Role / Device Role / Timing Role: High-fidelity front-end ADC configured in pseudo-differential mode to reject 50/60Hz mains interference from electrode pairs. Use Value: 6MHz track/hold bandwidth preserves signal integrity of QRS complexes (>1kHz spectral content), enabling accurate R-wave detection without external anti-alias filtering. |
| Energy Meter Data Logging | Touchscreen Controller Interface |
Use Scenario: Smart meter recording voltage/current waveforms for harmonic analysis and power quality reporting. IC Role / Device Role / Timing Role: Simultaneous sampling of isolated voltage and current channels using software-synchronized conversions. Use Value: 400ksps rate and 76dB SFDR allow capture of 32nd harmonic (1.6kHz @ 50Hz fundamental) with <0.1% THD error - meets IEC 62053-22 Class 0.5 accuracy requirements. |
Use Scenario: Resistive touchscreen digitizer in handheld HMI devices requiring rapid coordinate updates under variable lighting and ESD stress. IC Role / Device Role / Timing Role: Low-latency ADC converting X/Y electrode voltages with 2µs wake-up from sleep mode during touch events. Use Value: 10µA standby current extends battery life to >1 year in intermittent-use devices; internal reference ensures consistent touch sensitivity across battery discharge cycles. |
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 |
|---|---|---|---|
| MAX1290ACEI | 0°C to +70°C temperature range; ±0.5 LSB INL guaranteed only over commercial range - tighter INL spec but narrower operating envelope. | Suitable for lab equipment or indoor consumer devices; not rated for industrial ambient extremes. | Select MAX1290ACEI only if system ambient stays within 0–70°C and highest linearity is prioritized over environmental robustness. |
| ADS7822U | 12-bit, 200ksps, SPI interface, +2.5V ref; no parallel bus, no HBEN, smaller 8-pin SOIC package - lower pin count but serial protocol overhead. | Preferred for microcontrollers with limited GPIO; unsuitable for legacy 8-bit bus architectures requiring parallel access. | Choose ADS7822U when board space is critical and firmware can accommodate SPI timing constraints; avoid when interrupt-latency <2µs is required. |
Compared with MAX1290ACEI, the MAX1290BEEI trades minor INL tolerance (±1 LSB vs. ±0.5 LSB) for guaranteed performance across -40°C to +85°C - making it the default choice for outdoor, automotive, or factory-floor deployments. Against ADS7822U, MAX1290BEEI provides deterministic 12-bit parallel reads without bit-banging delays, at the cost of larger footprint and higher pin count.
Availability
MAX1290BEEI is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy meter data logging, and touchscreen controller interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1290BEEI 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 MAX1290BEEI belongs to Maxim's precision data-acquisition ADC family, designed specifically for space- and power-constrained systems needing integrated references, flexible input configurations, and robust industrial-grade operation without external support components.
FAQ
What is the operating temperature range for the MAX1290BEEI?
The MAX1290BEEI is specified for continuous operation from -40°C to +85°C. This industrial temperature grade is confirmed in the Ordering Information table and validated across all key parameters including INL (±1 LSB), DNL (±1 LSB), and supply current (2.5mA typical at 400ksps). It is distinct from the commercial-grade MAX1290ACEI (0°C to +70°C) and MAX1290BCEI (0°C to +70°C) variants.
Does the MAX1290BEEI require an external clock source?
No - the MAX1290BEEI supports both internal and external clock modes. In internal clock mode, the device generates its own 7.6MHz clock (resulting in ~3.6µs conversion time); CLK pin must be tied to VDD or GND to prevent floating. External clock mode accepts 100kHz–7.6MHz TTL/CMOS signals with 30–70% duty cycle, offering precise aperture control for demanding sampling applications.
How does the HBEN pin function on the MAX1290BEEI?
The HBEN (High-Byte Enable) pin on the MAX1290BEEI controls multiplexing of the 12-bit conversion result onto the shared 8-bit data bus (D0–D7). When HBEN = 1, D0–D7 carry D8–D11 (MSB nibble); when HBEN = 0, D0–D7 carry D0–D7 (LSB byte). This enables full 12-bit reads on 8-bit microcontrollers without additional data latches or bus transceivers.
Can the MAX1290BEEI operate with a 3.3V digital supply?
Yes - the MAX1290BEEI features a dedicated VLOGIC pin that accepts +2.7V to +5.5V, allowing direct interface with 3.3V microcontrollers. VDD remains at +5V for analog circuitry, while VLOGIC powers the digital I/O buffers. VOH/VOL specifications (VLOGIC – 0.5V / 0.4V) ensure reliable logic-level compatibility without external level shifters.
What is the maximum sampling rate of the MAX1290BEEI?
The MAX1290BEEI achieves a maximum sampling rate of 400ksps, corresponding to a minimum conversion time of 2.5µs. This rate is achievable with the internal 7.6MHz clock or an external clock of equivalent frequency. At lower rates (e.g., 10ksps), supply current drops to 400µA, and in full shutdown mode, it falls below 2µA - enabling ultra-low-power duty-cycled operation.
MAX1290BEEI 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:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX1290BEEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1290BEEI 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 reliable?
The price and inventory of MAX1290BEEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1290BEEI is usually 5 days.
3.What payment methods are accepted for MAX1290BEEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1290BEEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1290BEEI?
MAX1290BEEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1290BEEI 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?
For technical support, including MAX1290BEEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1290BEEI requirements.
6.How does Aetrix verify that MAX1290BEEI is sourced from the original manufacturer or authorized distributors?
All MAX1290BEEI 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 meets industry standards.
7.What is the process for return or replacement of MAX1290BEEI?
All MAX1290BEEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1290BEEI, 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 part is unused and in its original packaging.
Return procedure for MAX1290BEEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1290BEEI Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
