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Analog Devices Inc./Maxim Integrated MAX1091BCEI+
- Part No.:
- MAX1091BCEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1091BCEI+.pdf
- Description:
- IC ADC 10BIT 250KSPS 28-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
MAX1091BCEI+ from Maxim Integrated is a 10-bit successive-approximation ADC with integrated +2.5V reference, 8-channel single-ended / 4-channel pseudo-differential analog input multiplexer, byte-wide (8+2) parallel interface, and software-configurable unipolar/bipolar operation. 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 MAX1091BCEI+ datasheet, MAX1091BCEI+ pinout, MAX1091BCEI+ application, or MAX1091BCEI+ equivalent, this device is selected for battery-powered industrial sensors, patient monitoring front-ends, and energy metering subsystems requiring 250ksps sampling, ±0.5 LSB INL, sub-2µs wake-up, and internal track/hold with 3MHz full-power bandwidth.
Technical Context
The MAX1091BCEI+ implements a charge-redistribution SAR architecture with an internal 3MHz track/hold stage and configurable acquisition mode (internal or external), allowing precise timing control of sampling aperture. Its control byte (D7–D0) configures channel selection (A2:A0), unipolar/bipolar mode (UNI/BIP), single-ended/pseudo-differential mode (SGL/DIF), and power-down state (PD1/PD0).
Digital interface uses active-low CS, WR, and RD with tri-state outputs; HBEN enables 10-bit result multiplexing across D7–D0 and D1/D9, D0/D8 pins. The device supports both internal clock (3.6µs conversion time) and external clock (up to 4.8MHz) modes, with INT signaling conversion completion and data readiness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement applications |
| Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz (Nyquist-limited) |
| INL | ±0.5 LSB - ensures monotonicity and <0.05% full-scale linearity error over temperature |
| Analog Input Channels | 8 single-ended or 4 pseudo-differential - enables multi-sensor monitoring without external MUX |
| Reference | +2.5V internal - eliminates need for external reference IC and associated layout complexity |
| Power Consumption | 1.9mA at 250ksps - enables >100-hour battery life in 3V coin-cell–powered loggers |
| Wake-up Time | 2µs - allows rapid on-demand sampling to minimize active power in duty-cycled systems |
| Supply Range | VDD = +2.7V to +3.6V, VLOGIC = +1.8V to +3.6V - supports mixed-voltage system integration |
Pinout & Package
MAX1091BCEI+ is housed in a 28-pin QSOP (0.154" wide) package with exposed pad for thermal enhancement and standard JEDEC MS-013AC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HBEN | High-byte enable | Selects whether D7–D0 carry LSBs (HBEN=0) or MSBs (HBEN=1); enables 10-bit read in two cycles |
| D0/D8, D1/D9 | Multiplexed data I/O | Carry bits 0–9 depending on HBEN state; reduces bus width requirement vs. dedicated 10-bit interface |
| INT | Interrupt output | Active-low signal asserts when conversion completes and data is valid on bus |
| CS, WR, RD | Control inputs | Standard 8080-style parallel interface timing - compatible with legacy µP and FPGA glue logic |
| CH0–CH7 | Analog input channels | 8 single-ended inputs referenced to COM; supports software-selectable channel sequencing |
| REF, REFADJ | Reference control | REF outputs +2.5V; REFADJ disables internal bandgap when tied to VDD for external reference use |
| VLOGIC | Digital supply | Decouples logic-level voltage from analog supply - enables direct interface to 1.8V/2.5V/3.3V controllers |
| COM | Analog ground reference | Sets zero-code point in single-ended mode; must be stable to ±0.5 LSB during conversion |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended or pseudo-differential operation selectable per conversion via control byte - eliminates hardware reconfiguration |
| Two power-down modes | Standby (<10µA) and full shutdown (<2µA) - extends battery life in intermittent-sampling applications |
| Internal track/hold | 3MHz full-power bandwidth - supports undersampling of transient events without external T/H circuitry |
| Tri-state parallel interface | 8+2 data lines with CS-controlled high-impedance outputs - prevents bus contention in multi-peripheral systems |
| On-chip +2.5V reference | ±20ppm/°C tempco, ±100mV adjust range via REFADJ - reduces BOM count and improves system-level accuracy |
| Aperture jitter | <50ps (external acquisition mode) - preserves SNR in high-frequency signal digitization |
Applications
| Industrial Sensor Node | Patient Vital Sign Monitor |
|---|---|
Use Scenario: Multi-point temperature, pressure, and current sensing in factory automation PLC modules. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring 8 sensor channels at 10ksps with automatic channel sequencing. Use Value: Internal reference and 8-channel MUX eliminate external components; 1.9mA active current enables fanless enclosure design. |
Use Scenario: ECG/SpO₂ front-end in portable clinical monitors requiring low-noise, low-power signal digitization. IC Role / Device Role / Timing Role: Bipolar-mode ADC capturing differential bio-potential signals with COM-referenced baseline stability. Use Value: ±0.5 LSB INL and 56dB SINAD meet AAMI EC11 accuracy requirements; 2µs wake-up supports motion-triggered sampling. |
| Smart Energy Meter | Touchscreen Controller Interface |
Use Scenario: Voltage/current sampling in Class 0.5 electricity meters with anti-alias filtering and metrology-grade linearity. IC Role / Device Role / Timing Role: High-accuracy ADC digitizing isolated CT/PT outputs using pseudo-differential mode for common-mode rejection. Use Value: 76dB channel-to-channel crosstalk and ±2ppm/°C gain drift ensure long-term calibration stability across temperature. |
Use Scenario: Resistive touchscreen digitizer in handheld HMI devices needing fast coordinate acquisition and low standby drain. IC Role / Device Role / Timing Role: Single-ended ADC scanning X/Y electrode pairs at 250ksps to resolve touch position with <1ms latency. Use Value: Software-configurable unipolar input range (0–2.5V) matches touchscreen voltage divider output; 400µA @ 10ksps extends display-on battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, no internal reference, 200ksps max rate | Lacks 10-bit precision and parallel bus; requires external reference and level-shifting for 1.8V logic | Choose only if 8-bit resolution suffices and SPI bus is preferred over parallel interface |
| MAX11607ETE+ | 10-bit, I²C interface, internal reference, 100ksps, 12-pin TDFN | No parallel bus; lower speed and smaller package limit multi-channel throughput and µP compatibility | Prefer for space-constrained designs where I²C simplifies routing and 100ksps meets sampling needs |
Compared with ADS7822U and MAX11607ETE+, the MAX1091BCEI+ provides higher resolution, faster parallel data transfer, and integrated reference - making it optimal for µP-based data loggers requiring deterministic timing and minimal external components.
Availability
MAX1091BCEI+ is available at Aetrix Electronics and suitable for industrial sensor nodes, patient monitoring devices, and smart energy meters requiring stable component supply, extended temperature qualification (0°C to +70°C), and long-term production continuity.
Supply support for MAX1091BCEI+ 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.
The MAX1091BCEI+ belongs to Maxim's low-power precision ADC product line, engineered for space- and power-constrained data-acquisition systems requiring high linearity, integrated references, and simple µP interfacing without external support circuitry.
FAQ
What is the operating temperature range for MAX1091BCEI+?
The MAX1091BCEI+ is specified for operation from 0°C to +70°C. This commercial-grade temperature range is validated per the device's Absolute Maximum Ratings and Electrical Characteristics tables, with all key parameters-including INL, gain error, and supply current-guaranteed across this span. The 'B' grade suffix explicitly denotes the 0°C to +70°C range, distinguishing it from the 'E' grade (-40°C to +85°C) variants like MAX1091EEE+.
Does MAX1091BCEI+ require an external clock to operate?
No, MAX1091BCEI+ does not require an external clock. It features an internal oscillator that supports fully autonomous operation in internal clock mode (D7=1, D6=0), delivering a fixed 3.6µs conversion time. External clock mode (D7=1, D6=1) is optional and supports frequencies from 100kHz to 4.8MHz for applications needing precise timing control or synchronization with system clocks.
How many analog input channels does MAX1091BCEI+ support in single-ended mode?
MAX1091BCEI+ supports eight analog input channels (CH0 through CH7) in single-ended mode. This is confirmed by the Pin Description table, Typical Operating Circuits, and Feature list stating "8-Channel Single-Ended / 4-Channel Pseudo-Differential (MAX1091)". The MAX1093 variant supports four channels; the MAX1091BCEI+ is the 28-pin version with full 8-channel capability.
Can MAX1091BCEI+ interface directly with a 1.8V microcontroller?
Yes, MAX1091BCEI+ can interface directly with a 1.8V microcontroller via its VLOGIC pin. When VLOGIC is supplied at +1.8V, the device guarantees VIH ≤ 0.5V and VOL ≤ 0.4V for digital outputs, ensuring reliable logic-level compatibility. Input leakage remains ±0.1µA, and timing parameters (e.g., tDS, tDH) are maintained per the Electrical Characteristics table under VLOGIC = 1.8V conditions.
What is the purpose of the HBEN pin on MAX1091BCEI+?
The HBEN (High Byte Enable) pin on MAX1091BCEI+ controls multiplexing of the 10-bit conversion result across the 8-bit data bus. When HBEN = 1, D7–D0 carry bits D9–D2 (MSBs); when HBEN = 0, they carry bits D7–D0 (LSBs). This allows full 10-bit reads using standard 8-bit µP data buses without requiring additional data lines or complex bit-shifting firmware overhead.
MAX1091BCEI+ 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:
- Obsolete
- 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 ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1091BCEI+ FAQ
1.How can I place an order for MAX1091BCEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1091BCEI+ 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 MAX1091BCEI+ reliable?
The price and inventory of MAX1091BCEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1091BCEI+ is usually 5 days.
3.What payment methods are accepted for MAX1091BCEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1091BCEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1091BCEI+?
MAX1091BCEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1091BCEI+ 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 MAX1091BCEI+?
For technical support, including MAX1091BCEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1091BCEI+ requirements.
6.How does Aetrix verify that MAX1091BCEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1091BCEI+ 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 MAX1091BCEI+ meets industry standards.
7.What is the process for return or replacement of MAX1091BCEI+?
All MAX1091BCEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1091BCEI+, 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 MAX1091BCEI+ part is unused and in its original packaging.
Return procedure for MAX1091BCEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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