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Analog Devices Inc./Maxim Integrated MAX1290BCEI
- Part No.:
- MAX1290BCEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1290BCEI.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
The MAX1290BCEI from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, byte-wide parallel interface (8+4), 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 MAX1290BCEI datasheet, MAX1290BCEI pinout, MAX1290BCEI application, or MAX1290BCEI equivalent, this device delivers verified 400ksps sampling at 2.5mA supply current, ±0.5 LSB INL over 0°C to +70°C, and fast 2µs wake-up from shutdown - critical for battery-powered industrial sensors and patient monitoring front-ends requiring low-power precision digitization.
Technical Context
The MAX1290BCEI 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 range, single-ended/pseudo-differential input selection, and channel address (A2–A0).
It supports two 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 = ~610µV step size with ±0.5 LSB integral nonlinearity. |
| Sampling Rate | 400ksps max - enables real-time capture of signals up to 200kHz Nyquist bandwidth with undersampling capability. |
| Analog Supply | +5V single supply - eliminates need for dual-rail supplies; VLOGIC decoupled to support +2.7V–+5.5V I/O compatibility. |
| Reference | +2.5V internal bandgap - factory-trimmed, ±20ppm/°C TC, 2.49V–2.51V output, bypassed by 4.7µF capacitor at REF pin. |
| Power Consumption | 2.5mA at 400ksps - translates to 10mW total dissipation; drops to 400µA at 10ksps and 2µA in full shutdown. |
| Input Channels | 8 single-ended or 4 pseudo-differential - configurable via SGL/DIF bit; COM pin serves as zero-reference in single-ended mode. |
| Operating Temperature | 0°C to +70°C - specified performance across commercial temperature range per MAX1290BCEI ordering code. |
Pinout & Package
MAX1290BCEI is housed in a 28-pin QSOP package (5.3mm × 10.2mm body, 0.65mm pitch), compatible with standard surface-mount reflow profiles and offering compact footprint for space-constrained PCB layouts.
| 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 in two cycles. |
| 10 INT | Interrupt Output | Active-low open-drain signal indicating conversion completion and data readiness; tri-states when CS is high. |
| 11 RD | Read Strobe | Active-low control that enables three-state output drivers when CS is low; initiates data transfer to µP. |
| 12 WR | Write Strobe | Active-low control that latches configuration byte and triggers acquisition/conversion based on ACQMOD bit setting. |
| 13 CLK | Clock Input | Accepts external 100kHz–7.6MHz TTL/CMOS clock; tied to VDD/GND for internal clock mode. |
| 14 CS | Chip Select | Active-low enable; places INT, D7–D0 in high-impedance state when deasserted to allow bus sharing. |
| 15–22 CH0–CH7 | Analog Input Channels | Eight single-ended inputs; in pseudo-differential mode, paired as CH0/CH1, CH2/CH3, etc., with COM as common reference. |
| 23 COM | Common Reference | Ground reference for analog inputs; must remain stable to ±0.5 LSB during conversion to maintain accuracy. |
| 24 GND | Analog/Digital Ground | Single ground plane connection for both analog and digital sections; requires low-inductance layout. |
| 25 REFADJ | Reference Adjust | Bypass to GND with 0.01µF capacitor; connect to VDD to disable internal reference when using external REF. |
| 26 REF | Reference Output/Input | Provides +2.5V internal reference; accepts external reference when REFADJ tied to VDD. |
| 27 VDD | Analog Power Supply | +5V ±10% analog supply; requires 0.1µF ceramic bypass capacitor to GND near pin. |
| 28 VLOGIC | Digital I/O Supply | +2.7V to +5.5V supply for digital interface; sets VOH/VOL thresholds and isolates logic noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8-channel) or pseudo-differential (4-channel) operation selected via SGL/DIF bit in control byte - no hardware changes needed. |
| Flexible logic-level interface | VLOGIC pin allows independent digital supply from +2.7V to +5.5V - supports direct connection to 3.3V or 5V µPs without level shifters. |
| Low-power adaptive operation | Three power states: active (2.5mA), standby (≤10µA), full shutdown (≤2µA) - programmable via PD0/PD1 bits for dynamic power scaling. |
| Integrated precision reference | +2.5V internal bandgap reference with ±20ppm/°C tempco and 2.49V–2.51V output - eliminates external reference component and associated layout complexity. |
| Fast wake-up and conversion | 2µs wake-up from shutdown and 3.2µs conversion time (13 clock cycles @ 7.6MHz) - enables burst-mode sampling in low-duty-cycle applications. |
| Robust analog input protection | Internal clamping diodes allow input swing from (GND − 300mV) to (VDD + 300mV); full-scale accuracy maintained within (GND − 50mV) to (VDD + 50mV). |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous voltage/current measurement from 4–20mA transmitters and thermocouple amplifiers in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor outputs with 12-bit resolution and <±0.5 LSB INL to meet IEC 61000-4-5 surge immunity calibration requirements. Use Value: Internal +2.5V reference and 8-channel MUX reduce BOM count and board area versus discrete reference + external MUX solutions. |
Use Scenario: ECG/EEG front-end digitization in portable bedside monitors requiring low power and high DC accuracy. IC Role / Device Role / Timing Role: Bipolar-input ADC capturing ±1.25V differential signals from instrumentation amplifiers with 76dB IMD and 80dB SFDR. Use Value: 2µA shutdown current extends battery life in sleep mode; 2µs wake-up ensures responsive real-time waveform capture. |
| Energy Meter Data Logging | Touchscreen Controller Interface |
Use Scenario: Sampling voltage and current waveforms for harmonic analysis and kWh calculation in smart meters. IC Role / Device Role / Timing Role: High-speed 400ksps ADC with 350kHz full-linear bandwidth enabling accurate 50/60Hz fundamental + 21st harmonic measurement. Use Value: External clock mode supports precise sampling synchronization with metering ASICs; 6MHz T/H bandwidth prevents aliasing of high-frequency noise. |
Use Scenario: Digitizing resistive touchscreen X/Y coordinate voltages in handheld HMI devices with variable supply rails. IC Role / Device Role / Timing Role: Single-ended 8-channel ADC interfacing directly to touchscreen controller ICs via VLOGIC-compatible 3.3V I/O. Use Value: Software-selectable unipolar/bipolar mode accommodates varying touchscreen driver topologies without hardware redesign. |
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 | Same 28-pin QSOP package and pinout; tighter ±0.5 LSB INL spec (vs. ±1 LSB for MAX1290BCEI) across full temperature range. | Preferred for high-accuracy calibration-critical systems where INL stability over 0°C to +70°C is mandatory. | Select MAX1290ACEI when ±0.5 LSB INL must be guaranteed at temperature extremes; MAX1290BCEI offers cost-optimized performance for commercial-grade applications. |
| ADS7822U | 8-pin SOIC, SPI interface, 200ksps max, no internal reference - requires external REF and level-shifting for 3.3V µPs. | Suitable for space-constrained designs where serial interface and smaller footprint outweigh parallel bus speed benefits. | Choose ADS7822U only if board area is primary constraint and system already uses SPI infrastructure; MAX1290BCEI provides faster parallel throughput and integrated reference. |
Compared with MAX1290ACEI, the MAX1290BCEI trades guaranteed ±0.5 LSB INL for lower cost while retaining identical timing, power, and interface behavior; versus ADS7822U, it delivers 2× sampling rate, built-in reference, and native parallel bus support - eliminating four external components and reducing firmware overhead.
Availability
MAX1290BCEI is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, and energy meter data logging requiring stable component supply across commercial temperature grades.
Supply support for MAX1290BCEI 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 applications.
The MAX1290BCEI belongs to Maxim's precision data-acquisition ADC product line, designed specifically for low-power, space-constrained systems needing integrated reference, flexible I/O voltage, and rapid wake-up from shutdown.
FAQ
What is the maximum sampling rate supported by the MAX1290BCEI?
The MAX1290BCEI supports a maximum sampling rate of 400ksps under typical conditions (VDD = VLOGIC = +5V, fCLK = 7.6MHz). This rate is achievable in both internal and external clock modes, with conversion time fixed at 13 clock cycles. At lower clock frequencies, sampling rate scales linearly - e.g., 3.8MHz clock yields 200ksps - and minimum recommended clock is 100kHz to avoid hold-capacitor droop.
Does the MAX1290BCEI require an external reference voltage?
No, the MAX1290BCEI does not require an external reference voltage because it integrates a precision +2.5V bandgap reference with ±20ppm/°C temperature coefficient and 2.49V–2.51V output tolerance. An external reference can be used by connecting REFADJ to VDD and applying the reference to the REF pin, but the internal reference is fully functional and optimized for the device's specified performance.
How does the HBEN pin function in the MAX1290BCEI interface?
The HBEN (High-Byte Enable) pin on the MAX1290BCEI controls data bus multiplexing: when HBEN = 1, the four most significant bits (D8–D11) appear on D4–D7; when HBEN = 0, the eight least significant bits (D0–D7) are driven. This allows full 12-bit results to be read in two consecutive 8-bit cycles using standard 8-bit µP data buses without requiring additional latches or glue logic.
What are the power-down modes available on the MAX1290BCEI?
The MAX1290BCEI offers two software-selectable power-down modes controlled by PD0 and PD1 bits in the control byte: standby mode (≤10µA supply current) retains register state and reference bias, enabling 2µs wake-up; and full shutdown mode (≤2µA) disables the internal reference and all analog circuitry for ultra-low quiescent consumption between conversions.
Can the MAX1290BCEI operate with a 3.3V digital supply?
Yes, the MAX1290BCEI can operate with a 3.3V digital supply by connecting VLOGIC to +3.3V while maintaining VDD at +5V. Its digital I/O structure supports logic levels from +2.7V to +5.5V, ensuring valid VOH (>VLOGIC − 0.5V) and VOL (<0.4V) thresholds. This enables direct interfacing with 3.3V microprocessors without level-shifting circuitry.
MAX1290BCEI 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1290BCEI FAQ
1.How can I place an order for MAX1290BCEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1290BCEI 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 MAX1290BCEI reliable?
The price and inventory of MAX1290BCEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1290BCEI is usually 5 days.
3.What payment methods are accepted for MAX1290BCEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1290BCEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1290BCEI?
MAX1290BCEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1290BCEI 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 MAX1290BCEI?
For technical support, including MAX1290BCEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1290BCEI requirements.
6.How does Aetrix verify that MAX1290BCEI is sourced from the original manufacturer or authorized distributors?
All MAX1290BCEI 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 MAX1290BCEI meets industry standards.
7.What is the process for return or replacement of MAX1290BCEI?
All MAX1290BCEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1290BCEI, 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 MAX1290BCEI part is unused and in its original packaging.
Return procedure for MAX1290BCEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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