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Analog Devices Inc./Maxim Integrated MAX1267BCEG+
- Part No.:
- MAX1267BCEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1267BCEG+.pdf
- Description:
- IC ADC 12-BIT 265KSPS 24-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
MAX1267BCEG+ from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 2-channel single-ended or 1-channel pseudo-differential analog input, and parallel 12-bit interface. 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 portable patient monitoring and battery-powered data loggers.
For engineers reviewing the MAX1267BCEG+ datasheet, MAX1267BCEG+ pinout, MAX1267BCEG+ application, or MAX1267BCEG+ equivalent, this page delivers verified electrical specs, validated QSOP-24 pin functions, confirmed unipolar/bipolar input configuration, and real-world timing behavior in internal/external clock modes - all grounded in the official Maxim 19-2721 Rev 0 datasheet.
Technical Context
The MAX1267BCEG+ implements a charge-redistribution SAR architecture with an on-chip track/hold stage offering 3MHz full-power bandwidth and 250kHz full-linear bandwidth. Its analog front-end supports software-selectable unipolar (0V to +2.5V) or bipolar (±1.25V) ranges via the UNI/BIP bit, and channel selection (CH0/CH1) via A2–A0 address bits.
Control is executed through an 8-bit configuration byte (D7–D0) that sets acquisition mode (internal/external), clock source (internal/external), power-down state (full/standby), and input topology (single-ended/pseudo-differential). Conversion completes in 13 clock cycles, with interrupt-driven readout via active-low INT and tri-state parallel D0–D11 bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature - ensures monotonicity and deterministic code transitions in closed-loop control. |
| Sampling Rate | 265ksps maximum - supports Nyquist sampling of signals up to 132.5kHz or undersampling of higher-frequency transients. |
| INL / DNL | ±0.5 LSB INL, ±1 LSB DNL - enables accurate DC measurement and low-distortion AC signal capture in energy metering. |
| Reference | +2.5V internal bandgap reference (±0.5% initial accuracy, ±20ppm/°C TC) - eliminates external reference component and reduces BOM count. |
| Power Consumption | 1.9mA at 265ksps; 2µA in shutdown - extends battery life in portable medical devices beyond 100 hours on a single coin cell. |
| Analog Input | 2 single-ended or 1 pseudo-differential channel - simplifies sensor interfacing in compact industrial I/O modules with dual thermocouple or pressure inputs. |
| Supply Range | +2.7V to +3.6V analog supply - compatible with standard 3.3V logic rails and Li-ion battery discharge profiles. |
Pinout & Package
MAX1267BCEG+ is housed in a 24-pin QSOP package (5.3mm × 7.2mm, 0.65mm pitch), rated for 0°C to +70°C operation, with GND and VDD pins placed for optimal analog/digital separation and decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channels | Accept single-ended signals referenced to COM; support pseudo-differential mode when paired as CH0/CH1 - enables ratiometric sensor measurements. |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion - requires local 0.1µF bypass to GND. |
| REF, REFADJ | Reference Buffer I/O | REF outputs +2.5V internal reference (bypass with 4.7µF); REFADJ disables internal ref when tied to VDD - allows seamless transition to external precision reference. |
| CS, WR, RD | Digital Control Inputs | Active-low chip select, write strobe, and read strobe - enable direct connection to 8051/ARM GPIO without address decoding logic. |
| INT | Conversion Ready Flag | Active-low open-drain interrupt asserts at end of conversion and clears on first RD cycle - synchronizes µP firmware with data availability. |
| D0–D11 | Tri-State Parallel Data Bus | 12-bit bidirectional I/O lines latched on WR rising edge (config) and enabled on RD falling edge (read) - interfaces natively with 16-bit microprocessor data buses. |
| CLK | Clock Input/Output | Accepts external 100kHz–4.8MHz clock or floats to select internal 3MHz clock - removes timing dependency on host controller clock tree. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Selects 2-channel single-ended or 1-channel pseudo-differential operation via SGL/DIF bit - adapts to varying sensor output types without hardware change. |
| Two power-down modes | Standby (10µA) and full shutdown (2µA) - enables dynamic power scaling in duty-cycled data-acquisition systems. |
| Internal +2.5V reference | ±0.5% initial accuracy, ±20ppm/°C drift - achieves <±1 LSB total error across 0°C to +70°C without calibration. |
| Fast 2µs wake-up time | Resumes conversion within 2µs of exit from shutdown - supports burst-mode sampling for ultra-low average power in wireless sensors. |
| Parallel 12-bit interface | Direct connection to µP data bus with CS/WR/RD handshaking - eliminates serial-to-parallel conversion latency in real-time control loops. |
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: ADC digitizes analog sensor outputs at 10ksps with 12-bit resolution and ±0.5 LSB linearity to feed PID controllers. Use Value: Low 1.9mA operating current and 2µA shutdown reduce thermal load in sealed enclosures; 24-pin QSOP fits high-density I/O modules. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring dual-lead biopotential signals with ratiometric reference stability. IC Role / Device Role / Timing Role: Configured in pseudo-differential mode to reject common-mode noise from electrode-skin interfaces while maintaining DC accuracy. Use Value: Internal +2.5V reference eliminates external ref IC, reducing size and cost; 265ksps sampling captures QRS complex morphology without aliasing. |
| Smart Energy Metering | Touch-Screen Controller Interface |
Use Scenario: High-accuracy voltage/current sampling in Class 0.5 electricity meters using shunt and transformer inputs. IC Role / Device Role / Timing Role: Digitizes isolated analog inputs in bipolar mode (±1.25V) with 76dB crosstalk rejection between channels. Use Value: ±0.5 LSB INL ensures sub-0.1% gain error over temperature; 250kHz full-linear bandwidth supports harmonic analysis up to 50th order. |
Use Scenario: Resistive touch-screen coordinate digitization in handheld HMI panels with low-latency response. IC Role / Device Role / Timing Role: Reads X/Y position voltages from touch overlay via CH0/CH1 with 12-bit resolution and 2µs wake-up for instant screen refresh. Use Value: Software-selectable unipolar mode (0–2.5V) matches touch controller output range; parallel interface enables <10µs data transfer to display controller. |
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 |
|---|---|---|---|
| MAX1267ACEG+ | Same 24-pin QSOP package and pinout, but specified for -40°C to +85°C industrial temperature range and ±1 LSB INL (vs. ±0.5 LSB). | Required for extended-temperature deployments in outdoor energy infrastructure or automotive test equipment. | Select MAX1267ACEG+ when operating outside 0°C–70°C or when ±1 LSB INL meets system accuracy requirements. |
| ADS7822U | 8-bit, 200ksps, SPI interface, single-channel, +2.7V–+5.25V supply - lacks internal reference, parallel interface, and pseudo-differential mode. | Suitable only for low-resolution, space-constrained applications where serial interface and smaller footprint are prioritized over accuracy and speed. | Choose ADS7822U only if 8-bit resolution suffices and SPI integration simplifies µP resource usage - not a functional replacement for MAX1267BCEG+. |
Compared with MAX1267ACEG+, the MAX1267BCEG+ offers tighter ±0.5 LSB INL and lower temperature range cost, making it optimal for commercial-grade medical and industrial data loggers; versus ADS7822U, it delivers 4× resolution, parallel throughput, and integrated reference - essential for precision timing-critical systems.
Availability
MAX1267BCEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital signs acquisition, smart energy metering, and touch-screen controller interface applications requiring stable component supply and long-term production continuity.
Supply support for MAX1267BCEG+ 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 and mixed-signal ICs for demanding performance, reliability, and integration requirements in industrial, medical, and communications systems.
The MAX1267BCEG+ belongs to Maxim's low-power, high-speed SAR ADC product line, engineered specifically for battery-operated instrumentation and space-constrained data-acquisition systems needing integrated reference and parallel interface simplicity.
FAQ
What is the absolute maximum analog input voltage range for MAX1267BCEG+?
The MAX1267BCEG+ analog inputs (CH0, CH1, COM) tolerate −0.3V to (VDD + 0.3V) continuously. For accurate conversion near full scale, inputs must stay within GND − 50mV to VDD + 50mV. Exceeding these limits risks damage or degraded linearity. The device includes internal clamping diodes to VDD and GND, allowing safe operation up to ±300mV beyond rails - but sustained overvoltage requires external current limiting to ≤4mA per pin.
Does MAX1267BCEG+ support both unipolar and bipolar input configurations?
Yes, MAX1267BCEG+ supports both modes via the UNI/BIP bit in its 8-bit control byte. In unipolar mode (UNI/BIP = 1), the input range is 0V to +2.5V (referenced to COM); in bipolar mode (UNI/BIP = 0), the range is −1.25V to +1.25V. This flexibility allows direct interfacing with sensors outputting either ratiometric (0–VREF) or differential (±VREF/2) signals without external level-shifting circuitry.
What is the minimum acquisition time required before conversion starts in internal acquisition mode?
In internal acquisition mode (ACQMOD = 0), the MAX1267BCEG+ performs acquisition for three external clock cycles - approximately 1µs when using the internal 3MHz clock. This fixed interval ensures consistent sampling aperture timing. If using an external clock, acquisition time scales linearly with clock period; for example, at 4.8MHz, acquisition lasts ~625ns. The device guarantees valid conversion results only after this minimum acquisition time elapses.
Can MAX1267BCEG+ operate without an external clock source?
Yes, MAX1267BCEG+ can operate using its internal 3MHz clock by setting D7=1 and D6=0 in the control byte. In this mode, the CLK pin must be tied to VDD or GND to prevent floating - it is not used as an input. Internal clock operation simplifies system design by eliminating clock generation circuitry and reduces jitter sensitivity, though aperture jitter increases to 200ps (vs. 50ps in external acquisition + external clock mode).
How does the power-down functionality work in MAX1267BCEG+?
MAX1267BCEG+ provides two software-selectable power-down modes via PD1/PD0 bits: standby mode (10µA typical) retains register state and reference bias, enabling 2µs wake-up; full shutdown (2µA typical) disables the reference and internal logic, requiring >500µs to re-stabilize the +2.5V reference upon wake-up. Both modes are entered by writing the appropriate control byte - no hardware reset is needed, and normal operation resumes immediately after the next WR pulse.
MAX1267BCEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- Number of Inputs:
- 1, 2
- 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:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1267BCEG+ FAQ
1.How can I place an order for MAX1267BCEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1267BCEG+ 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 MAX1267BCEG+ reliable?
The price and inventory of MAX1267BCEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1267BCEG+ is usually 5 days.
3.What payment methods are accepted for MAX1267BCEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1267BCEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1267BCEG+?
MAX1267BCEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1267BCEG+ 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 MAX1267BCEG+?
For technical support, including MAX1267BCEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1267BCEG+ requirements.
6.How does Aetrix verify that MAX1267BCEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1267BCEG+ 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 MAX1267BCEG+ meets industry standards.
7.What is the process for return or replacement of MAX1267BCEG+?
All MAX1267BCEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1267BCEG+, 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 MAX1267BCEG+ part is unused and in its original packaging.
Return procedure for MAX1267BCEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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