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Analog Devices Inc./Maxim Integrated MAX1091BEEI
- Part No.:
- MAX1091BEEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1091BEEI.pdf
- Description:
- 8-CHANNEL, 10-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,964
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Product details
Overview
MAX1091BEEI from Maxim Integrated is a 10-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, byte-wide parallel (8+2) interface, and software-configurable 8-channel single-ended or 4-channel pseudo-differential input multiplexer. It operates from a single +3V analog supply, supports digital logic levels from +1.8V to +3.6V via VLOGIC, and delivers 250ksps sampling rate with 5.7mW power consumption at full speed - ideal for battery-powered data acquisition in portable medical and industrial monitoring systems.
For engineers reviewing the MAX1091BEEI datasheet, MAX1091BEEI pinout, MAX1091BEEI application, or MAX1091BEEI equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in the official MAX1091/MAX1093 datasheet Rev 2 (12/02), including temperature range (-40°C to +85°C), ±1 LSB INL, and 28-pin QSOP package mapping.
Technical Context
The MAX1091BEEI implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track-and-hold stage, enabling undersampling of high-frequency transients up to 3MHz while maintaining DC accuracy. Its control byte (D7–D0) configures unipolar/bipolar mode, single-ended/pseudo-differential operation, channel selection (CH0–CH7), and acquisition mode (internal/external).
It features dual power-down modes (standby and full shutdown), reducing current to 10µA and 2µA respectively, and uses HBEN to multiplex 10-bit output across an 8-bit data bus - D0/D8 and D1/D9 carry MSBs when HBEN = 1, LSBs when HBEN = 0. The INT signal asserts low upon conversion completion and auto-clears on first RD cycle or new control byte write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC with no missing codes over temperature - ensures monotonicity in closed-loop control feedback paths. |
| Sampling Rate | 250ksps maximum - supports real-time capture of 125kHz sine waves (Nyquist-limited) with >56dB SINAD. |
| INL / DNL | ±1 LSB integral nonlinearity, ±1 LSB differential nonlinearity - guarantees <0.1% end-point linearity error for precision sensor digitization. |
| Reference | +2.5V internal bandgap reference (±20ppm/°C TC, ±100mV adjust range via REFADJ) - eliminates external reference component count and layout area. |
| Power Consumption | 1.9mA at 250ksps (5.7mW @ VDD = VLOGIC = 3V); 2µA in full shutdown - enables multi-year battery life in intermittent-sampling IoT nodes. |
| Analog Inputs | 8 single-ended or 4 pseudo-differential channels (CH0–CH7), COM-referenced - supports multi-sensor monitoring without external mux ICs. |
| Digital Interface | Byte-wide parallel (D0–D7 + D0/D8, D1/D9) with CS/WR/RD/INT/HBEN - directly connects to 8-bit microcontrollers without glue logic or FIFO buffering. |
Pinout & Package
MAX1091BEEI 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 |
|---|---|---|
| HBEN | High-byte enable control | Selects whether D0/D8 and D1/D9 carry MSBs (HBEN=1) or LSBs (HBEN=0) - enables 10-bit readout on 8-bit buses without external latches. |
| D0/D8, D1/D9 | Multiplexed bidirectional data I/O | Carry 10-bit conversion result under HBEN control - eliminates need for 10-bit wide data traces or serial conversion. |
| INT | Open-drain interrupt output | Asserts low when conversion completes and data is valid - allows CPU sleep-wake synchronization without polling overhead. |
| CS, WR, RD | Active-low parallel interface controls | Standard microprocessor bus timing (tCS ≥ 100ns, tWR ≥ 60ns) - interfaces directly with 8051, AVR, and ARM Cortex-M GPIOs. |
| VLOGIC | Digital supply rail | Accepts +1.8V to +3.6V - matches modern low-voltage MCUs and avoids level-shifter components in mixed-supply systems. |
| REF, REFADJ | Internal reference buffer outputs | REF requires 4.7µF bypass; REFADJ accepts 0.01µF bypass and disables internal ref when tied to VDD - supports flexible reference sourcing. |
| CH0–CH7 | Analog input channels | Single-ended inputs referenced to COM; pseudo-differential pairs (CH0/CH1, CH2/CH3, etc.) - enables ratiometric measurements against system ground or reference. |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion - requires low-noise, low-impedance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime-selectable unipolar/bipolar and single-ended/pseudo-differential modes via control byte - adapts to diverse sensor types (thermocouples, RTDs, pressure bridges) without hardware change. |
| Integrated +2.5V reference | 2.500V ±10mV output with ±20ppm/°C drift - removes external reference IC, saves BOM cost and board area, and improves system-level accuracy by eliminating inter-component mismatch. |
| Low-power dual shutdown | Standby (10µA) and full shutdown (2µA) modes activated by PD0/PD1 bits - extends battery life in wake-on-event sensor nodes by >1000× versus continuous operation. |
| External acquisition control | Two-WR pulse sequence (ACQMOD=1 then ACQMOD=0) enables precise aperture timing and deterministic sampling jitter (<50ps) - critical for time-of-flight or phase-sensitive measurements. |
| 3MHz full-power bandwidth T/H | Supports accurate digitization of fast transients (e.g., motor current spikes, ECG QRS complexes) without external front-end amplification or anti-alias filtering complexity. |
Applications
| Industrial Process Monitoring | Patient Vital Signs Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: 10-bit ADC digitizing 8 analog sensor channels with ±1 LSB linearity, synchronized to PLC scan cycle via INT-driven interrupt. Use Value: Eliminates external reference and mux ICs, reducing channel cost by $0.35/unit and PCB area by 12mm² per channel vs. discrete solution. |
Use Scenario: Portable ECG monitor capturing lead-I/II/III signals with simultaneous respiration and SpO₂ analog inputs. IC Role / Device Role / Timing Role: Low-noise, low-power ADC sampling at 250ksps with bipolar input mode for differential ECG leads and internal 2.5V reference for ratiometric SpO₂ ADC. Use Value: 2µA shutdown current enables >3-year battery life in standby; 3MHz T/H bandwidth captures QRS complex rise time (<10µs) without distortion. |
| Energy Metering Subsystem | Smart Building Environmental Sensing |
Use Scenario: Residential smart meter measuring voltage, current, and neutral current using shunt and isolation amplifier outputs. IC Role / Device Role / Timing Role: Simultaneous sampling of 3 isolated analog channels (CH0–CH2) in pseudo-differential mode to reject common-mode noise from switching power supplies. Use Value: ±1 LSB INL ensures <0.1% energy measurement error over -40°C to +85°C; VLOGIC compatibility with 1.8V MCU reduces system power by 22%. |
Use Scenario: Wireless HVAC controller reading CO₂, humidity, ambient light, and temperature from analog-output sensors. IC Role / Device Role / Timing Role: 8-channel single-ended ADC interfacing to 4 sensors + calibration references, powered from coin-cell via VLOGIC = 1.8V. Use Value: 10µA standby current extends 2032 coin-cell life to 18 months; software-configurable unipolar mode matches 0–3V sensor output range exactly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1091ACEI | Same 28-pin QSOP package and pinout; 0°C to +70°C temp range vs. -40°C to +85°C; ±0.5 LSB INL (tighter) vs. ±1 LSB | Preferred for commercial-grade data loggers where extended temperature operation is unnecessary and higher linearity is required | Select MAX1091ACEI only if ambient operating temperature stays within 0°C–70°C and ±0.5 LSB INL is mandatory for calibration-critical applications. |
| ADS7822U | 8-bit resolution, SPI interface, 200ksps max, SO-8 package; no internal reference; requires external 2.5V ref and level shifters for 1.8V logic | Suitable for cost-sensitive, lower-resolution applications where serial interface and smaller footprint outweigh parallel bus convenience | Choose ADS7822U only if 8-bit resolution suffices, SPI is preferred over parallel, and board space is constrained - not a functional or pin replacement. |
Compared with MAX1091ACEI, the MAX1091BEEI trades ±0.5 LSB INL for guaranteed operation down to -40°C, making it suitable for outdoor or automotive-adjacent industrial deployments; versus ADS7822U, it delivers 2-bit higher resolution, parallel interface simplicity, and integrated reference - at the cost of larger package and higher BOM count.
Availability
MAX1091BEEI is available at Aetrix Electronics and suitable for industrial process monitoring, portable patient monitoring, energy metering subsystems, and smart building environmental sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1091BEEI 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications - emphasizing integration, reliability, and low-power performance.
The MAX1091BEEI belongs to Maxim's precision data-acquisition ADC family, engineered specifically for space- and power-constrained systems needing high linearity, integrated references, and direct microcontroller interfacing without external support components.
FAQ
What is the operating temperature range of the MAX1091BEEI?
The MAX1091BEEI is rated for -40°C to +85°C operation, as confirmed by the Ordering Information table in the MAX1091/MAX1093 datasheet Rev 2. This extended industrial temperature range enables reliable deployment in harsh environments such as factory floors, outdoor metering enclosures, and portable medical devices exposed to ambient thermal cycling - unlike the commercial-grade MAX1091ACEI (0°C to +70°C).
Does the MAX1091BEEI require an external clock source?
No - the MAX1091BEEI supports both internal and external clock modes. When D7=1 and D6=0 in the control byte, it uses its internal 3MHz clock, eliminating external crystal or oscillator components. External clock mode (D7=D6=1) accepts 100kHz–4.8MHz TTL/CMOS signals, offering flexibility for systems requiring synchronous sampling across multiple MAX1091BEEI devices.
How does the HBEN pin affect data readout on the MAX1091BEEI?
The HBEN pin on the MAX1091BEEI controls multiplexing of the 10-bit conversion result onto the 8-bit data bus: when HBEN=1, D0/D8 and D1/D9 carry the two most significant bits (MSBs); when HBEN=0, those pins carry the two least significant bits (LSBs). This allows full 10-bit reads using standard 8-bit microcontroller ports without additional latches or bit-banging overhead.
Can the MAX1091BEEI interface directly with a 1.8V microcontroller?
Yes - the MAX1091BEEI's VLOGIC pin accepts +1.8V to +3.6V, allowing direct connection to 1.8V I/O domains. Digital outputs (D0–D7, INT) are level-shifted to VLOGIC, and input thresholds (VIH/VIL) scale accordingly. No external level translators are needed, simplifying design and reducing component count in ultra-low-power embedded systems.
What is the purpose of the COM pin on the MAX1091BEEI?
The COM pin on the MAX1091BEEI serves as the analog ground reference for single-ended input mode, setting the zero-code voltage. In pseudo-differential mode, it is unused. During conversion, COM must remain stable to ±0.5 LSB (±0.1 LSB for best performance); therefore, it requires a dedicated low-impedance analog ground connection, separate from noisy digital GND returns, to prevent code errors in precision measurements.
MAX1091BEEI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- 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 ~ 3.9V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1091BEEI FAQ
1.How can I place an order for MAX1091BEEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1091BEEI 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 MAX1091BEEI reliable?
The price and inventory of MAX1091BEEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1091BEEI is usually 5 days.
3.What payment methods are accepted for MAX1091BEEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1091BEEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1091BEEI?
MAX1091BEEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1091BEEI 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 MAX1091BEEI?
For technical support, including MAX1091BEEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1091BEEI requirements.
6.How does Aetrix verify that MAX1091BEEI is sourced from the original manufacturer or authorized distributors?
All MAX1091BEEI 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 MAX1091BEEI meets industry standards.
7.What is the process for return or replacement of MAX1091BEEI?
All MAX1091BEEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1091BEEI, 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 MAX1091BEEI part is unused and in its original packaging.
Return procedure for MAX1091BEEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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