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Analog Devices Inc./Maxim Integrated MAX1291BCEI+
- Part No.:
- MAX1291BCEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1291BCEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,580
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Product details
Overview
MAX1291BCEI+ from Maxim Integrated is a 12-bit, 250ksps 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 +3V analog supply and supports digital logic levels from +1.8V to +3.6V via VLOGIC, enabling direct interfacing with low-voltage microcontrollers in portable data-acquisition systems.
For engineers reviewing the MAX1291BCEI+ datasheet, MAX1291BCEI+ pinout, MAX1291BCEI+ application, or MAX1291BCEI+ equivalent, key selection considerations include its ±1 LSB INL at 0°C to +70°C, 3MHz full-power bandwidth track/hold, 2µs wake-up from shutdown, tri-state INT output, and QSOP-28 package compatibility with industrial sensor front-ends and battery-powered medical monitors.
Technical Context
The MAX1291BCEI+ implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track-and-hold stage, supporting both internal and external clock modes (4.8MHz max) and internal/external acquisition control via ACQMOD bit. Its analog input structure enables unipolar/bipolar and single-ended/pseudo-differential configurations through software-controlled register writes.
Conversion timing is deterministic: 13 clock cycles per conversion, with acquisition time (tACQ = 3.2µs typ.) and conversion time (tCONV = 3.6µs typ.) specified under internal clock mode. The device uses a 12-bit capacitive DAC and features automatic power-down between conversions, reducing supply current to 2µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise sensor digitization |
| Sampling Rate | 250ksps - supports real-time monitoring of fast transients in energy metering and motor control |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and <0.025% integral nonlinearity over temperature for calibration-critical applications |
| Reference | +2.5V internal - eliminates external reference component count and improves system-level accuracy stability |
| Power Consumption | 1.9mA at 250ksps - enables >10-hour operation on a single AA cell in portable patient monitors |
| Track/Hold Bandwidth | 3MHz full-power - allows undersampling of high-frequency signals up to 1.5MHz without aliasing degradation |
| Wake-up Time | 2µs - permits rapid sampling bursts while maintaining ultra-low average power in duty-cycled systems |
Pinout & Package
MAX1291BCEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained PCB layouts in handheld instrumentation and industrial modules.
| 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-enables compact µP interface without extra data lines |
| CH0–CH7 | Analog input channels | 8 single-ended or 4 pseudo-differential inputs-supports multi-sensor acquisition without external MUX |
| COM | Analog ground reference | Zero-code reference point; must remain stable to ±0.5 LSB during conversion to avoid code-dependent offset error |
| VLOGIC | Digital supply rail | Independent +1.8V to +3.6V logic supply-allows seamless integration with 1.8V/2.5V/3.3V microcontrollers |
| INT | Interrupt output | Active-low, tri-state when CS high-enables interrupt-driven firmware polling without bus contention |
| WR / RD / CS | Parallel interface controls | Standard 8080-style timing-eliminates need for custom glue logic or FPGA interface design |
| REF / REFADJ | Reference buffer I/O | Internal +2.5V reference with 4.7µF bypass; REFADJ tied to VDD disables bandgap for external reference use |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended (8 ch) or pseudo-differential (4 ch) via SGL/DIF bit-reduces BOM count by eliminating external signal conditioning for common-mode rejection |
| Two power-down modes | Standby (10µA) and full shutdown (2µA)-enables adaptive power management in sleep-wake sensor nodes |
| Internal clock option | Fixed 3.6µs conversion time-removes external clock source and associated layout noise sensitivity |
| Aperture jitter | <50ps (external acquisition mode)-preserves SNR >67dB at 125kHz input frequency for high-fidelity waveform capture |
| Input protection | Clamp diodes allow (GND − 300mV) to (VDD + 300mV) input swing-tolerates transient overvoltage without external TVS |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 analog sensor channels with synchronized sampling and interrupt-driven data transfer to ARM Cortex-M4 host. Use Value: ±1 LSB INL and 3MHz T/H bandwidth ensure <0.1% measurement error across 0–100°C range without per-channel calibration. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals from dry electrodes with minimal power budget. IC Role / Device Role / Timing Role: Low-noise, low-power ADC converting differential lead-II ECG and photoplethysmogram signals at 250Hz–1kHz effective rate. Use Value: 2µs wake-up and 2µA shutdown current extend battery life to >72 hours on 300mAh Li-ion cell. |
| Energy Meter Front-End | Touch Screen Controller Interface |
Use Scenario: Sampling shunt voltage and current transformer outputs in Class 0.5 smart electricity meters compliant with IEC 62053-21. IC Role / Device Role / Timing Role: High-accuracy ADC capturing 50/60Hz fundamental and harmonic content with 67dB SINAD at 250ksps. Use Value: Internal +2.5V reference with ±2ppm/°C TC eliminates drift-induced metering errors over -25°C to +70°C operating range. |
Use Scenario: Digitizing resistive touch panel X/Y coordinate voltages in handheld HMI devices with 1.8V I/O microcontrollers. IC Role / Device Role / Timing Role: Parallel-interface ADC providing 12-bit position resolution with VLOGIC = +1.8V compatibility and HBEN-controlled data readout. Use Value: Software-selectable unipolar/bipolar mode supports both ratiometric and absolute voltage measurement schemes across varying panel designs. |
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+ | ±0.5 LSB INL (vs. ±1 LSB), 0°C to +70°C grade-tighter DC accuracy but identical timing, power, and pinout | Suitable for metrology-grade instruments requiring <0.012% linearity error | Select MAX1291ACEI+ only if system-level calibration budget cannot absorb ±1 LSB INL; otherwise MAX1291BCEI+ offers optimal cost/performance balance |
| ADS7822U | 8-bit resolution, SPI interface, no internal reference-smaller 8-pin SOIC package but requires external ref and serial interface logic | Fits space-constrained designs where 8-bit resolution suffices and µP has SPI peripherals available | Choose ADS7822U for footprint-sensitive consumer electronics; avoid for precision 12-bit applications or where parallel bus simplifies firmware development |
Compared with MAX1291ACEI+, the MAX1291BCEI+ trades 0.5 LSB INL tolerance for broader production yield and lower unit cost, while versus ADS7822U it provides 4× resolution, integrated reference, and parallel interface-reducing total system component count by ≥3 passive parts and eliminating serial protocol overhead.
Availability
MAX1291BCEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, energy metering, and human-machine interface applications requiring stable component supply across extended production lifecycles.
Supply support for MAX1291BCEI+ 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, automotive, and communications markets.
The MAX1291BCEI+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, space-constrained applications demanding integrated references, flexible input configuration, and robust parallel interfacing without external support components.
FAQ
What is the operating temperature range for the MAX1291BCEI+?
The MAX1291BCEI+ is rated for 0°C to +70°C ambient operation, as confirmed by its ordering suffix "B" and the Electrical Characteristics table specifying performance over this range. This commercial-grade temperature range suits indoor industrial equipment, portable test instruments, and consumer medical devices where environmental extremes are controlled. The MAX1291BCEI+ maintains ±1 LSB INL and 12-bit resolution across the full 0°C to +70°C span without derating.
Does the MAX1291BCEI+ require an external clock source?
No-the MAX1291BCEI+ supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own 3.6µs conversion timing without external clock circuitry. 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–4.8MHz TTL/CMOS signals for precise aperture control in high-SNR applications.
How does the HBEN pin function on the MAX1291BCEI+?
The HBEN (High Byte Enable) pin on the MAX1291BCEI+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus: when HBEN = 1, D0–D7 carry bits D8–D11 (MSB nibble); when HBEN = 0, D0–D7 carry bits D0–D7 (LSB nibble). This allows full 12-bit readout using only 8 data lines, reducing PCB routing complexity and µP port pin count compared to fixed 12-bit parallel interfaces.
Can the MAX1291BCEI+ operate with a 1.8V digital supply?
Yes-the MAX1291BCEI+ accepts VLOGIC from +1.8V to +3.6V, enabling direct interfacing with 1.8V microcontrollers without level-shifting. The digital outputs (D0–D7, INT, RD, WR, CS) are fully specified at VLOGIC = 1.8V, with VOH ≥ VLOGIC − 0.5V and VOL ≤ 0.4V. This capability simplifies power domain partitioning in mixed-voltage systems and reduces overall system power consumption.
What is the purpose of the COM pin on the MAX1291BCEI+?
The COM (Common) pin on the MAX1291BCEI+ serves as the analog ground reference for single-ended input mode and the negative input reference for pseudo-differential mode. In single-ended operation, it sets the zero-code voltage; in pseudo-differential mode, it defines the return path for the sampled signal. Stability of COM to ±0.5 LSB during conversion is mandatory-any noise or drift on COM directly injects offset error into the digitized result, degrading measurement accuracy.
MAX1291BCEI+ 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):
- 250k
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1291BCEI+ FAQ
1.How can I place an order for MAX1291BCEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1291BCEI+ 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 MAX1291BCEI+ reliable?
The price and inventory of MAX1291BCEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1291BCEI+ is usually 5 days.
3.What payment methods are accepted for MAX1291BCEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1291BCEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1291BCEI+?
MAX1291BCEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1291BCEI+ 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 MAX1291BCEI+?
For technical support, including MAX1291BCEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1291BCEI+ requirements.
6.How does Aetrix verify that MAX1291BCEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1291BCEI+ 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 MAX1291BCEI+ meets industry standards.
7.What is the process for return or replacement of MAX1291BCEI+?
All MAX1291BCEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1291BCEI+, 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 MAX1291BCEI+ part is unused and in its original packaging.
Return procedure for MAX1291BCEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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