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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:
- 2-CHANNEL, 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:930
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Product details
Overview
MAX1267BCEG from Maxim Integrated is a 12-bit, 265ksps successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, software-configurable 2-channel single-ended or 1-channel pseudo-differential 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-acquisition systems.
For engineers reviewing the MAX1267BCEG datasheet, MAX1267BCEG pinout, MAX1267BCEG application, or MAX1267BCEG equivalent, key selection criteria include its 24-pin QSOP package, ±0.5 LSB INL, internal track/hold with 3MHz full-power bandwidth, and support for unipolar/bipolar input configuration via control-byte programming.
Technical Context
The MAX1267BCEG implements a charge-redistribution SAR architecture with an integrated 12-bit capacitive DAC and on-chip track/hold stage. Its analog front-end supports two distinct acquisition modes - internal (timed by internal clock) and external (user-controlled WR edge) - enabling precise aperture control down to 50ps jitter in external acquisition mode.
Configuration is handled via an 8-bit control byte written to D7–D0, defining channel selection (A2–A0), SGL/DIF, UNI/BIP, ACQMOD, and PD1/PD0 power-down states. The parallel interface uses active-low CS, WR, and RD with tri-state D0–D11 outputs and open-drain INT interrupt, fully compatible with standard 16-bit microprocessor buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 265ksps - supports real-time capture of audio-band and sensor signals up to ~130kHz Nyquist |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature |
| Supply Current | 1.9mA at 265ksps - enables <5.4mW power draw from +3V supply for extended battery life |
| Reference | +2.5V internal - eliminates need for external reference IC and associated layout area |
| Input Configuration | 2 single-ended or 1 pseudo-differential channel - matches compact sensor arrays and differential transducer interfaces |
| Package | 24-pin QSOP - 3.9mm × 8.7mm footprint suitable for space-constrained medical and industrial PCBs |
Pinout & Package
MAX1267BCEG is housed in a 24-pin QSOP package (3.9mm × 8.7mm, 0.635mm pitch) rated for 0°C to +70°C operation. Pin functions are validated per Maxim's official pin description table and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channels | Accept single-ended signals referenced to COM; selectable as positive inputs in pseudo-differential mode |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion |
| REF | Reference Buffer Output | Delivers +2.5V internal reference; requires 4.7µF bypass capacitor to GND for stability |
| REFADJ | Reference Trim Input | Connect to VDD to disable internal bandgap when using external reference |
| VDD | Analog Power Supply | +2.7V to +3.6V supply; bypass with 0.1µF capacitor to GND near pin |
| GND | Analog/Digital Ground | Common return for analog and digital sections; low-impedance connection critical for noise immunity |
| CS | Chip Select | Active-low enable; places D0–D11 in high-impedance state when high |
| WR | Write Control | Rising edge latches control byte (D7–D0) and initiates acquisition/conversion sequence |
| RD | Read Control | Falling edge enables tri-state output drivers to place conversion result on D0–D11 bus |
| INT | Interrupt Output | Open-drain, active-low flag signaling completion of conversion and data readiness |
| CLK | Clock Input | Accepts external TTL/CMOS clock (100kHz–4.8MHz); tied high/low in internal clock mode |
| D0–D11 | Data Bus I/O | Tri-state bidirectional lines carrying control byte input and 12-bit conversion result output |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (2 channels) or pseudo-differential (1 channel) selection via SGL/DIF bit - adapts to diverse sensor interfaces without hardware change |
| Unipolar/bipolar input support | Configurable via UNI/BIP bit: 0V–2.5V (unipolar) or –1.25V to +1.25V (bipolar) - accommodates both ground-referenced and AC-coupled signals |
| Two-tier power-down | Standby mode (<1µA) and full shutdown (<2µA) - extends battery life in intermittent-sampling applications like energy meters |
| Internal 3MHz track/hold bandwidth | Enables accurate digitization of fast transients and undersampling of RF signals beyond Nyquist limit |
| Fast 2µs wake-up time | Minimizes latency between power-down exit and first valid conversion - critical for responsive sensor polling |
Applications
| Patient Monitoring | Industrial Data Logging |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, or respiration waveforms in portable clinical devices. IC Role / Device Role / Timing Role: Primary ADC digitizing analog biosensor outputs with low-latency interrupt-driven readout. Use Value: ±0.5 LSB INL and 67dB SINAD ensure diagnostic-grade waveform fidelity; 1.9mA active current enables >100-hour battery life in handheld units. |
Use Scenario: Periodic sampling of temperature, pressure, and humidity sensors in factory-floor environmental loggers. IC Role / Device Role / Timing Role: Low-power, multi-channel ADC managing sensor multiplexing and timed conversions via µP control. Use Value: Software-selectable unipolar/bipolar mode simplifies interface to diverse transducers; 24-pin QSOP eases routing in dense industrial PCB layouts. |
| Energy Management Systems | Touch Screen Controllers |
Use Scenario: Real-time voltage/current measurement in smart metering and power quality analyzers. IC Role / Device Role / Timing Role: High-accuracy ADC capturing AC line cycles with synchronized sampling and minimal missing codes. Use Value: No missing codes over temperature and ±4 LSB gain error support Class 0.5 metering compliance; internal reference reduces BOM count. |
Use Scenario: Digitizing resistive touch panel X/Y coordinate voltages in kiosk and HMI displays. IC Role / Device Role / Timing Role: Dual-channel ADC rapidly scanning touch electrode pairs with configurable input range. Use Value: 2-channel single-ended mode maps directly to X/Y analog outputs; 265ksps rate enables <5ms full-panel scan for responsive user interaction. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, no internal reference - requires external REF and level-shifting for +3V systems | Lower accuracy; suited for cost-sensitive, non-critical sensing where 12-bit precision is unnecessary | Select only if 8-bit resolution suffices and serial interface is preferred over parallel bus timing constraints |
| MAX11100ETE+ | 12-bit, 500ksps, 10-pin µMAX, internal reference - higher speed but only 1 input channel and no pseudo-differential mode | Single-ended-only; better for high-speed single-signal acquisition where channel count is secondary | Choose when sampling rate >265ksps is required and dual-channel flexibility is not needed |
Compared with ADS7822U and MAX11100ETE+, the MAX1267BCEG uniquely balances 12-bit accuracy, dual-channel configurability, parallel interface simplicity, and ultra-low power - making it optimal for space- and energy-constrained embedded systems requiring flexible analog input handling.
Availability
MAX1267BCEG is available at Aetrix Electronics and suitable for patient monitoring, industrial data logging, and energy management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
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, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX1267 belongs to Maxim's low-power, high-accuracy SAR ADC product line, engineered specifically for battery-operated instrumentation and compact data-acquisition systems where size, power, and ease of µP interfacing are critical.
FAQ
What is the operating temperature range for MAX1267BCEG?
The MAX1267BCEG is specified for 0°C to +70°C ambient operation, as confirmed by its ordering code suffix 'C' and the '0°C to +70°C' entry in the official Maxim ordering information table. This commercial-grade temperature range suits indoor medical devices, consumer test equipment, and non-automotive industrial environments where extreme thermal stress is absent.
Does MAX1267BCEG include an internal voltage reference?
Yes, the MAX1267BCEG integrates a precision +2.5V bandgap reference with ±20ppm/°C temperature coefficient and 2.49V–2.51V output tolerance at +25°C. When enabled, this reference drives the ADC core and is accessible at the REF pin, eliminating the need for an external reference IC in most applications.
How many analog input channels does MAX1267BCEG support?
The MAX1267BCEG supports two analog input channels (CH0 and CH1) in single-ended mode, or one pseudo-differential pair (CH0/CH1) when configured via the SGL/DIF control bit. This is explicitly stated in the General Description and confirmed in Table 2 and Table 3 of the datasheet - distinguishing it from the 6-channel MAX1265 variant.
What package type is used for MAX1267BCEG?
The MAX1267BCEG is packaged in a 24-pin QSOP (Quad Small Outline Package) with 0.635mm lead pitch and 3.9mm × 8.7mm body dimensions. This is verified by the '24 QSOP' notation in the Ordering Information table and the corresponding pin diagram labeled 'MAX1267' showing 24 pins.
Can MAX1267BCEG operate with a 5V microprocessor interface?
No, the MAX1267BCEG is designed for +2.7V to +3.6V analog supply (VDD) and its digital I/Os are CMOS-compatible with that voltage range. Direct connection to a 5V µP bus would violate absolute maximum ratings; level-shifting circuitry or a 3.3V-compatible µP is required for safe interfacing.
MAX1267BCEG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- Number of Inputs:
- 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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