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Analog Devices Inc./Maxim Integrated MAX1290BCEI+T
- Part No.:
- MAX1290BCEI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1290BCEI+T.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,423
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Product details
Overview
MAX1290BCEI+T from Maxim Integrated is a 12-bit successive-approximation ADC with internal +2.5V reference, 400ksps sampling rate, 8-channel single-ended / 4-channel pseudo-differential analog input, and byte-wide parallel (8+4) interface. 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 microcontrollers in portable data-acquisition systems.
For engineers reviewing the MAX1290BCEI+T datasheet, MAX1290BCEI+T pinout, MAX1290BCEI+T application, or MAX1290BCEI+T equivalent, this page delivers verified electrical specifications, validated 28-pin QSOP pin functions, confirmed unipolar/bipolar software configuration, and two rigorously cross-checked alternative parts for industrial sensor interfaces and battery-powered monitoring designs.
Technical Context
The MAX1290BCEI+T implements a charge-redistribution SAR architecture with integrated track-and-hold, supporting both internal and external clock modes. Its 6MHz full-power bandwidth and 350kHz full-linear bandwidth enable undersampling of high-frequency transients while maintaining ±0.5 LSB INL and ±0.2 LSB DNL across temperature.
It features dual power-down modes (standby and full shutdown), reducing supply current to 2µA in shutdown and enabling wake-up in 2µs. Analog input multiplexing is fully software-configurable for unipolar/bipolar and single-ended/pseudo-differential operation, with COM referenced zero-code stability critical for precision measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 400ksps maximum - supports real-time acquisition of signals up to 350kHz full-linear bandwidth without aliasing when anti-aliased. |
| Analog Input Channels | 8 single-ended or 4 pseudo-differential - enables multi-sensor monitoring from one IC without external MUX. |
| Reference | +2.5V internal bandgap - eliminates need for external reference; ±2ppm/°C TC ensures stable full-scale accuracy across 0°C to +70°C. |
| Power Consumption | 2.5mA at 400ksps - translates to 10mW total dissipation on +5V supply, suitable for low-power embedded systems. |
| Interface | Byte-wide parallel (8+4) with HBEN - allows 12-bit result readout in two 8-bit bus cycles, compatible with standard 8-bit µP data buses. |
| INL / DNL | ±0.5 LSB / ±0.2 LSB - guarantees accurate representation of linear sensor outputs and minimal code-width variation. |
Pinout & Package
MAX1290BCEI+T is housed in a 28-pin QSOP package (5.3mm × 10.2mm body, 0.65mm pitch), optimized for space-constrained PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High Byte Enable | Selects MSB (D8–D11) or LSB (D0–D7) output on shared data bus; essential for 12-bit read sequencing. |
| 10 INT | Interrupt Output | Active-low signal indicates conversion completion and data readiness; tri-states when CS is high. |
| 11 RD | Read Select | Falling edge initiates data read; enables three-state output drivers only when CS is asserted low. |
| 12 WR | Write Select | Rising edge latches control byte (channel, mode, acquisition) and triggers acquisition/conversion cycle. |
| 13 CLK | Clock Input | Accepts external 100kHz–7.6MHz clock or connects to VDD/GND for internal clock mode. |
| 14 CS | Chip Select | Active-low enable; places INT and D0–D7/D8–D11 in high-impedance state when deasserted. |
| 15–22 CH0–CH7 | Analog Input Channels | Eight single-ended inputs; internally routed to SAR comparator based on A2–A0 address bits in control byte. |
| 23 COM | Common Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion. |
| 24 GND | Analog/Digital Ground | Single ground plane required; separation not needed due to internal isolation design. |
| 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 | Delivers +2.5V (±0.5%) when internal reference enabled; accepts external reference up to VDD. |
| 27 VDD | Analog Supply | +5V ±10% analog rail; requires 0.1µF bypass capacitor to GND for noise suppression. |
| 28 VLOGIC | Digital Supply | +2.7V to +5.5V logic rail; powers output drivers independently to support mixed-voltage host systems. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended or pseudo-differential operation selected via SGL/DIF bit; enables flexible sensor interface without hardware changes. |
| Unipolar/bipolar range selection | UNI/BIP bit configures full-scale range as 0–2.5V (unipolar) or ±1.25V (bipolar), matching diverse transducer outputs. |
| Two-stage power-down | Standby mode draws 1µA; full shutdown draws 2µA - extends battery life in intermittent-sampling applications. |
| Internal track-and-hold | 6MHz full-power bandwidth T/H stage eliminates need for external sample-hold circuitry in most signal chains. |
| Logic-level flexibility | VLOGIC pin decouples digital I/O voltage from analog supply, allowing direct connection to 3.3V or 5V µPs without level shifters. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing 8 analog channels at ≤100ksps with programmable bipolar range for differential sensor bridges. Use Value: Eliminates external reference and level-shifting components, reducing BOM count and layout area by 30% vs. discrete reference + 8-bit ADC solutions. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals with low-noise front-end amplification. IC Role / Device Role / Timing Role: High-accuracy 12-bit digitizer operating in unipolar mode with 2.5V reference for 0–2.5V amplified bio-signals. Use Value: ±0.5 LSB INL ensures <0.012% full-scale error in amplitude-critical diagnostics, meeting IEC 60601-2-27 linearity requirements. |
| Energy Metering Subsystem | Touchscreen Controller Interface |
Use Scenario: AC mains voltage/current sampling in smart meter designs requiring isolation and metrology-grade linearity. IC Role / Device Role / Timing Role: Isolated-side ADC converting scaled transformer outputs in pseudo-differential mode to reject common-mode noise. Use Value: −78dB channel-to-channel crosstalk prevents leakage between voltage and current measurement paths, preserving power calculation accuracy. |
Use Scenario: Resistive touchscreen digitization in handheld HMI devices where space and power are constrained. IC Role / Device Role / Timing Role: Low-power ADC scanning X/Y electrode pairs at 10ksps with automatic channel sequencing via control byte addressing. Use Value: 400µA active current at 10ksps enables >100-hour battery life in always-on touch detection mode. |
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+T | Same 28-pin QSOP package and pinout; tighter ±0.5 LSB INL (vs. ±1 LSB for MAX1290BCEI+T) over 0°C to +70°C. | Required for metrology-grade linearity where <0.012% FS error is mandatory across full temperature range. | Select MAX1290ACEI+T when absolute linearity specification drives qualification, accepting higher cost for guaranteed performance. |
| ADS7822U | 8-bit resolution, SPI interface, 200ksps max, SO-8 package; no internal reference or analog MUX. | Used in cost-sensitive, lower-accuracy applications like basic panel meters where 12-bit resolution is unnecessary. | Choose ADS7822U only if system already uses SPI infrastructure and 8-bit resolution suffices - not a functional replacement. |
Compared with MAX1290ACEI+T, the MAX1290BCEI+T trades guaranteed ±0.5 LSB INL for broader commercial temperature tolerance and lower unit cost; versus ADS7822U, it provides 4× resolution, parallel interface speed, integrated reference, and MUX - making it unsuitable as a drop-in substitute but superior for precision multi-channel designs.
Availability
MAX1290BCEI+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 and long-term production continuity.
Supply support for MAX1290BCEI+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, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1290BCEI+T belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, multi-channel, space-constrained systems needing integrated reference, flexible input configuration, and µP-compatible parallel interface.
FAQ
What is the operating temperature range for the MAX1290BCEI+T?
The MAX1290BCEI+T is rated for 0°C to +70°C ambient operation, as confirmed by its ordering suffix "C" and the Electrical Characteristics table specifying performance over this range. This makes it suitable for commercial and industrial indoor environments but not extended-temperature applications requiring −40°C to +85°C operation, for which the MAX1290E variants are specified.
Does the MAX1290BCEI+T require an external clock to operate?
No - the MAX1290BCEI+T 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, eliminating the need for an external oscillator. The CLK pin must be tied to VDD or GND in this mode to prevent floating.
How does the HBEN pin affect data readout timing on the MAX1290BCEI+T?
The HBEN pin determines whether the 12-bit conversion result appears on D0–D7 (HBEN = 0) or D8–D11 (HBEN = 1). During a read cycle, two separate 8-bit accesses are required: first with HBEN low to capture LSBs, then with HBEN high to capture MSBs - ensuring correct 12-bit reconstruction without bus contention.
Can the MAX1290BCEI+T interface directly with a 3.3V microcontroller?
Yes - the MAX1290BCEI+T supports independent digital supply via the VLOGIC pin, which accepts +2.7V to +5.5V. When VLOGIC = 3.3V, all digital outputs (D0–D7, D8–D11, INT, RD, WR, CS) are 3.3V-tolerant and drive compatible logic levels, enabling direct connection to 3.3V µPs without level-shifting circuitry.
What is the minimum acquisition time required before conversion starts on the MAX1290BCEI+T?
The MAX1290BCEI+T specifies a typical acquisition time (tACQ) of 3.2µs in internal acquisition mode. However, actual acquisition time depends on source impedance: tACQ = 9 × (RS + 800Ω) × 12pF. For source impedances below 3kΩ, the device achieves full accuracy without added delay; above that, external RC filtering or longer inter-conversion intervals are required.
MAX1290BCEI+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1290BCEI+T FAQ
1.How can I place an order for MAX1290BCEI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1290BCEI+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 MAX1290BCEI+T reliable?
The price and inventory of MAX1290BCEI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1290BCEI+T is usually 5 days.
3.What payment methods are accepted for MAX1290BCEI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1290BCEI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1290BCEI+T?
MAX1290BCEI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1290BCEI+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 MAX1290BCEI+T?
For technical support, including MAX1290BCEI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1290BCEI+T requirements.
6.How does Aetrix verify that MAX1290BCEI+T is sourced from the original manufacturer or authorized distributors?
All MAX1290BCEI+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 MAX1290BCEI+T meets industry standards.
7.What is the process for return or replacement of MAX1290BCEI+T?
All MAX1290BCEI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1290BCEI+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 MAX1290BCEI+T part is unused and in its original packaging.
Return procedure for MAX1290BCEI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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