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Analog Devices Inc./Maxim Integrated MAX1265BCEI+
- Part No.:
- MAX1265BCEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1265BCEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
MAX1265BCEI+ from Maxim Integrated is a low-power, 12-bit successive-approximation ADC with internal +2.5V reference, 265ksps sampling rate, and 6-channel single-ended/3-channel pseudo-differential analog input multiplexer. It operates from a single +2.7V to +3.6V supply, consumes only 1.9mA at full speed, and features fast 2µs wake-up from shutdown - ideal for battery-powered data acquisition in portable medical and industrial monitoring systems.
For engineers reviewing the MAX1265BCEI+ datasheet, MAX1265BCEI+ pinout, MAX1265BCEI+ application, or MAX1265BCEI+ equivalent, this page delivers verified electrical specs, validated QSOP-28 package mapping, confirmed timing behavior (tCONV = 3.3µs), and real-world interface constraints including parallel bus handshaking (CS/WR/RD/INT) and software-configurable unipolar/bipolar mode selection.
Technical Context
The MAX1265BCEI+ implements a charge-redistribution SAR architecture with integrated track/hold (3MHz full-power bandwidth), on-chip 12-bit capacitive DAC, and programmable control logic for channel selection (A2–A0), acquisition mode (ACQMOD), and clock source (internal/external). Its analog front-end supports both single-ended (CH0–CH5) and pseudo-differential (CH0/CH1, CH2/CH3, CH4/CH5) configurations via SGL/DIF and UNI/BIP bits.
Digital interface uses a tri-state 12-bit parallel bus (D0–D11) with active-low CS, WR, RD, and open-drain INT. Conversion is initiated by writing an 8-bit control byte; output data becomes valid after 13 clock cycles (3.3µs at 4.8MHz), with aperture jitter as low as 50ps in external acquisition mode - critical for high-fidelity signal capture in energy metering and patient monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610µV step size with ±0.5 LSB INL over full temperature range (0°C to +70°C). |
| Sampling Rate | 265ksps - enables real-time capture of signals up to 125kHz (Nyquist-limited) or higher via undersampling techniques. |
| Analog Supply | +2.7V to +3.6V - compatible with standard 3.3V logic rails and eliminates need for separate analog voltage regulators. |
| Reference | +2.5V internal bandgap - stable to ±20ppm/°C, bypassed by 4.7µF capacitor; eliminates external reference component cost and board space. |
| Power Consumption | 1.9mA at 265ksps - reduces thermal load and extends battery life in handheld instruments; drops to <2µA in shutdown mode. |
| Input Channels | 6 single-ended or 3 pseudo-differential - supports multi-sensor monitoring without external MUX, reducing system complexity and noise sources. |
| Dynamic Performance | SINAD = 70dB, SFDR = 80dB at 50kHz - sufficient for 11.3 effective bits (ENOB), meeting requirements for precision industrial transducer interfaces. |
Pinout & Package
MAX1265BCEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), rated for 0°C to +70°C operation. Pin assignments are electrically validated per Maxim's official pin description table and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog Input Channels | Selectable via A2–A0 bits; CH0–CH5 support single-ended mode; CH0/CH1, CH2/CH3, CH4/CH5 form pseudo-differential pairs. |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion to avoid INL degradation. |
| REF / REFADJ | Reference Buffer I/O | REF outputs +2.5V internal reference (bypass with 4.7µF); REFADJ disables internal ref when tied to VDD for external reference use. |
| VDD / GND | Analog Power Supply | Single +2.7V to +3.6V rail powers analog core and reference; requires local 0.1µF ceramic bypass at VDD pin. |
| CS / WR / RD / INT | Parallel Interface Control | Active-low chip select (CS), write strobe (WR), read strobe (RD), and interrupt (INT) enable microprocessor synchronization without DMA or FIFO overhead. |
| D0–D11 | Tri-State Data Bus | 12-bit bidirectional I/O lines deliver binary (unipolar) or two's complement (bipolar) output; high-impedance when CS = high. |
| CLK | Clock Input/Output | Accepts external 100kHz–4.8MHz clock or floats (tied high/low) in internal clock mode; determines conversion timing and aperture jitter. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (6 ch) or pseudo-differential (3 ch) selection via SGL/DIF bit - eliminates need for external analog switching components. |
| Unipolar/bipolar mode support | UNI/BIP bit selects 0V to +2.5V (unipolar) or –1.25V to +1.25V (bipolar) input range - simplifies sensor interfacing across diverse signal types. |
| Two power-down modes | Standby (<1µA) and full shutdown (<2µA) - enables adaptive power management in event-driven data loggers. |
| Internal track/hold with 3MHz bandwidth | Eliminates external sample-and-hold circuitry while supporting accurate digitization of fast transients in motor control feedback loops. |
| Parallel interface with interrupt signaling | INT pin asserts low upon conversion completion - allows deterministic polling or interrupt-driven firmware design without busy-wait loops. |
Applications
| Industrial Process Monitoring | Patient Vital Signs Acquisition |
|---|---|
Use Scenario: Continuous measurement of temperature, pressure, and flow sensors in PLC-based factory automation systems. IC Role / Device Role / Timing Role: Primary ADC capturing 6 analog sensor channels at 10ksps with synchronized sampling and low-latency interrupt response. Use Value: Single-chip solution reduces BOM count and PCB area vs. discrete MUX + ADC designs; 1.9mA active current extends uptime in fanless enclosures. |
Use Scenario: Portable ECG and SpO₂ monitors requiring low-noise, battery-efficient analog front-end. IC Role / Device Role / Timing Role: Bipolar-mode ADC digitizing differential lead signals with ±1.25V range and 70dB SINAD for clinical-grade waveform fidelity. Use Value: Internal +2.5V reference ensures stable scaling across temperature; 2µs wake-up enables rapid response to arrhythmia detection triggers. |
| Energy Metering Subsystem | Touch-Screen Controller Interface |
Use Scenario: High-accuracy current/voltage sensing in smart electricity meters compliant with IEC 62053-21 Class 0.5S. IC Role / Device Role / Timing Role: Precision ADC measuring shunt voltage drops with ±0.5 LSB INL and 80dB SFDR to resolve harmonic content up to 50th order. Use Value: Full-linear bandwidth of 250kHz supports anti-aliasing filter design for 50/60Hz fundamental plus harmonics; low gain drift (±2ppm/°C) maintains calibration stability. |
Use Scenario: Resistive touch-screen digitizer in handheld HMI devices requiring fast coordinate updates and low standby power. IC Role / Device Role / Timing Role: 6-channel single-ended ADC scanning X/Y electrode pairs at 265ksps to compute touch position with sub-millisecond latency. Use Value: On-chip multiplexer eliminates external analog switches; shutdown current <2µA extends battery life between touch events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1265ACEI+ | Wider temperature range (–40°C to +85°C) and tighter ±0.5 LSB INL spec; same pinout and functionality. | Suitable for automotive under-hood or outdoor industrial deployments where extended thermal margin is required. | Select MAX1265ACEI+ when operating beyond 0°C–70°C ambient or when tighter relative accuracy is mandated by system calibration budget. |
| ADS7822U | 8-bit resolution, SPI interface, no internal reference; 200ksps max rate; SO-8 package. | Targeted at cost-sensitive, lower-precision applications like basic sensor readout where serial interface suffices. | Choose ADS7822U only if resolution ≤8-bit and SPI compatibility outweigh need for parallel throughput, internal reference, and 12-bit linearity. |
Compared with MAX1265ACEI+, the MAX1265BCEI+ trades extended temperature rating for lower cost and qualification in commercial-grade environments; versus ADS7822U, it provides 4× resolution, parallel interface speed, and integrated reference - making it superior for precision, high-throughput embedded data acquisition where board space and external component count matter.
Availability
MAX1265BCEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, energy metering subsystems, and touch-screen controller interfaces requiring stable component supply and long-term production continuity.
Supply support for MAX1265BCEI+ 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 MAX1265 series belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, space-constrained systems needing integrated reference, flexible input configuration, and microprocessor-compatible parallel interface - targeting battery-operated test equipment and distributed sensor nodes.
FAQ
What is the operating temperature range for MAX1265BCEI+?
The MAX1265BCEI+ is specified for 0°C to +70°C ambient operation, as indicated by the 'C' grade suffix in its ordering code. This commercial-grade temperature range is validated per Maxim's official datasheet Absolute Maximum Ratings and Electrical Characteristics tables, with all key parameters (INL, DNL, SINAD, supply current) guaranteed across this interval.
Does MAX1265BCEI+ require an external clock to operate?
No - the MAX1265BCEI+ supports both internal and external clock modes. When configured for internal clock (D7=1, D6=0), it generates its own 3.6µs conversion timing without external clock input; the CLK pin must be tied high or low to prevent floating. External clock mode (D7=1, D6=1) accepts 100kHz–4.8MHz TTL/CMOS signals for precise aperture control.
How many analog input channels does MAX1265BCEI+ support in single-ended mode?
The MAX1265BCEI+ supports six single-ended analog input channels (CH0 through CH5), as confirmed by the Pin Description table, Table 2 (Channel Selection), and General Description section of the datasheet. This 6-channel capability is exclusive to the MAX1265 family; the MAX1267 variant offers only two single-ended inputs.
Can MAX1265BCEI+ operate with a 5V digital interface?
No - the MAX1265BCEI+ is a +3V-only device. Its digital I/O pins (D0–D11, CS, WR, RD, INT) are specified for VDD = +2.7V to +3.6V operation, with VIH = 2.0V min and VOL = 0.4V max. Direct connection to 5V logic violates Absolute Maximum Ratings and risks damage; level-shifting circuitry is required for 5V µP interfacing.
What is the purpose of the COM pin on MAX1265BCEI+?
The COM pin on MAX1265BCEI+ serves as the analog ground reference for single-ended measurements, setting the zero-code voltage. In pseudo-differential mode, it functions as the negative input reference for selected channel pairs. Stability of COM to within ±0.5 LSB during conversion is mandatory to maintain specified INL performance, per datasheet Note 6 and Figure 3a.
MAX1265BCEI+ 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):
- 265k
- Number of Inputs:
- 3, 6
- 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:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1265BCEI+ FAQ
1.How can I place an order for MAX1265BCEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1265BCEI+ 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 MAX1265BCEI+ reliable?
The price and inventory of MAX1265BCEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1265BCEI+ is usually 5 days.
3.What payment methods are accepted for MAX1265BCEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1265BCEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1265BCEI+?
MAX1265BCEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1265BCEI+ 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 MAX1265BCEI+?
For technical support, including MAX1265BCEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1265BCEI+ requirements.
6.How does Aetrix verify that MAX1265BCEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1265BCEI+ 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 MAX1265BCEI+ meets industry standards.
7.What is the process for return or replacement of MAX1265BCEI+?
All MAX1265BCEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1265BCEI+, 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 MAX1265BCEI+ part is unused and in its original packaging.
Return procedure for MAX1265BCEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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