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Analog Devices Inc./Maxim Integrated MAX1268BEEG+
- Part No.:
- MAX1268BEEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1268BEEG+.pdf
- Description:
- IC ADC 12BIT 420KSPS 24-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
MAX1268BEEG+ from Maxim Integrated is a 12-bit, 420ksps successive-approximation ADC with integrated +2.5V reference, single +5V supply operation, and parallel 12-bit interface. It supports 2-channel single-ended or 1-channel pseudo-differential analog input configurations, software-selectable unipolar/bipolar mode, and fast 2µs wake-up from shutdown - ideal for portable patient monitoring and industrial data-logging systems requiring low power and compact footprint.
For engineers reviewing the MAX1268BEEG+ datasheet, MAX1268BEEG+ pinout, MAX1268BEEG+ application, or MAX1268BEEG+ equivalent, this page delivers verified electrical specifications, validated QSOP-24 package mapping, confirmed timing behavior (tCONV = 3.2µs), real-world dynamic performance (SINAD = 70dB, THD = –80dB), and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The MAX1268BEEG+ implements a charge-redistribution SAR architecture with an internal 6MHz full-power bandwidth track/hold stage and on-chip clock generation. Its control byte (D7–D0) configures acquisition mode (internal/external), input polarity (unipolar/bipolar), signal topology (single-ended/pseudo-differential), and channel selection (CH0/CH1).
It operates in three power states: full operation (2.8mA @ 420ksps), standby (950µA), and deep shutdown (2µA). Analog input protection includes internal clamping diodes allowing ±300mV overvoltage tolerance, while REFADJ enables fine-tuning or disabling of the internal bandgap reference.
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. |
| Sampling Rate | 420ksps - supports real-time capture of signals up to 350kHz full-linear bandwidth without aliasing. |
| Supply Voltage | +5V ±10% - single-supply operation eliminates need for dual-rail or LDO sequencing in battery-powered designs. |
| Reference | +2.5V internal - factory-trimmed bandgap reference with ±20ppm/°C TC and 2.5V ±10mV output at TA = +25°C. |
| Power Consumption | 2.8mA @ 420ksps - enables >100hr runtime on a 250mAh Li-ion cell in continuous acquisition mode. |
| Aperture Jitter | <50ps - ensures >70dB SINAD at 50kHz input frequency, critical for high-fidelity medical waveform digitization. |
| Conversion Time | 3.2µs - fixed 13-clock-cycle latency enables deterministic timing for µP-controlled sampling sequences. |
Pinout & Package
MAX1268BEEG+ is housed in a 24-pin QSOP package (5.0mm × 7.5mm, 0.635mm pitch), optimized for high-density PCB layouts in space-constrained instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channels | Accept single-ended signals referenced to COM; support pseudo-differential measurement between CH0–CH1 pair. |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion. |
| REF, REFADJ | Reference Buffer I/O | REF outputs +2.5V internal reference; REFADJ adjusts or disables internal reference when tied to VDD. |
| CS, WR, RD | Digital Control Inputs | Active-low chip select, write strobe, and read strobe - enable µP-compatible parallel bus interfacing with no glue logic. |
| D0–D11 | Tri-State Data Bus | 12-bit bidirectional I/O lines - output converted data in unipolar (binary) or bipolar (two's complement) format. |
| INT | Interrupt Output | Active-low open-drain flag signaling end-of-conversion and data readiness; compatible with 3.3V/5V µP interrupt inputs. |
| VDD, GND | Power Supply | +5V analog supply with 0.1µF local bypass; shared analog/digital ground minimizes noise coupling in mixed-signal layout. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (2 channels) or pseudo-differential (1 channel) via SGL/DIF bit - eliminates external multiplexer in dual-sensor systems. |
| Two power-down modes | Standby (950µA) and full shutdown (2µA) - reduces average current by >99% during idle intervals in duty-cycled data loggers. |
| Internal track/hold with 6MHz BW | Enables accurate undersampling of RF or transient signals beyond Nyquist limit - supports spectral analysis applications. |
| On-chip +2.5V reference | Eliminates external reference IC and associated decoupling components - reduces BOM count and board area by ≥3 parts. |
| Parallel 12-bit interface | Direct connection to 16-bit µP data bus without address latching - simplifies firmware development and shortens conversion-to-read latency. |
Applications
| Patient Monitoring | Industrial Data Logging |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, and respiration waveforms in portable bedside monitors. IC Role / Device Role / Timing Role: Primary analog front-end ADC converting sensor outputs at 250–500Hz with <±0.5 LSB linearity and sub-µs aperture jitter. Use Value: Enables clinical-grade waveform fidelity (SINAD ≥70dB) while sustaining >8-hour battery life using 2.8mA active current. |
Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during measurement bursts, leveraging 2µA shutdown state between samples. Use Value: Extends node lifetime to >5 years on a single CR2032 coin cell by minimizing quiescent current during 99.9% of operational time. |
| Energy Management Systems | Touch Screen Controllers |
Use Scenario: Real-time voltage/current sampling in smart metering modules for harmonic distortion analysis. IC Role / Device Role / Timing Role: High-SFDR (–80dB) ADC capturing 50/60Hz fundamentals plus 5th–13th harmonics with minimal intermodulation. Use Value: Supports IEC 62053-22 Class 0.5 accuracy compliance without external anti-alias filtering due to 350kHz linear bandwidth. |
Use Scenario: Resistive touch panel coordinate digitization in kiosk and HMI displays with 12-bit position resolution. IC Role / Device Role / Timing Role: Dual-channel sequencer reading X/Y electrode voltages in rapid succession using internal acquisition mode. Use Value: Achieves <5ms full-screen scan time with deterministic 3.2µs conversion latency - eliminates pointer lag in user interaction. |
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 |
|---|---|---|---|
| MAX1268ACEG+ | 0°C to +70°C operating range vs. –40°C to +85°C for MAX1268BEEG+; same INL (±0.5 LSB) and power specs. | Suitable for commercial-grade equipment only; not qualified for extended industrial or automotive environments. | Select MAX1268ACEG+ only if ambient temperature stays within 0–70°C and cost sensitivity outweighs thermal margin requirements. |
| ADS7822U | 8-bit resolution, SPI interface, 200ksps max rate; no internal reference - requires external 2.5V source. | Limited to lower-accuracy position sensing or basic voltage monitoring where 12-bit precision is unnecessary. | Choose ADS7822U only when system already uses SPI peripherals and 8-bit resolution suffices - not a functional replacement for MAX1268BEEG+. |
Compared with MAX1268ACEG+, MAX1268BEEG+ provides guaranteed performance across –40°C to +85°C without derating, while ADS7822U trades resolution, interface compatibility, and integration for lower cost and smaller footprint - making it suitable only for non-critical, low-complexity sensing.
Availability
MAX1268BEEG+ is available at Aetrix Electronics and suitable for patient monitoring, industrial data logging, energy management systems, and touch screen controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1268BEEG+ 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 MAX1266/MAX1268 family was designed specifically for battery-powered data-acquisition systems needing high resolution, low power, and minimal external components - targeting portable instrumentation and embedded sensor interfaces.
FAQ
What is the maximum sampling rate supported by the MAX1268BEEG+?
The MAX1268BEEG+ supports a maximum sampling rate of 420ksps under standard conditions (VDD = +5V, fCLK = 7.6MHz, TA = +25°C). At this rate, total supply current is 2.8mA and conversion time remains fixed at 3.2µs. Sampling above 420ksps is not specified and may degrade INL or cause timing violations on the parallel interface.
Does the MAX1268BEEG+ require an external clock source?
No - the MAX1268BEEG+ includes an internal clock generator. When D7=1 and D6=0 in the control byte, the device enters internal clock mode and operates at ~2.8MHz, delivering 3.6µs conversion time. The CLK pin must be tied to VDD or GND in this mode to prevent floating.
Can the MAX1268BEEG+ operate with a 3.3V digital interface?
Yes - the MAX1268BEEG+ digital I/O pins (CS, WR, RD, D0–D11, INT) are TTL/CMOS-compatible with VIH = 4.0V min and VIL = 0.8V max. When interfacing with 3.3V µPs, use level-shifting buffers or ensure the host controller can drive logic-high signals ≥4.0V, or configure the µP's GPIOs for 5V-tolerant mode.
What is the absolute input voltage range for analog channels on the MAX1268BEEG+?
The absolute analog input voltage range for CH0 and CH1 is GND to VDD (0V to +5.5V), protected by internal clamping diodes. However, for accurate conversion, inputs must stay within –50mV to VDD + 50mV. In unipolar mode, valid signal range is 0V to +2.5V; in bipolar mode, it is –1.25V to +1.25V referenced to COM.
How does the pseudo-differential mode function on the MAX1268BEEG+?
In pseudo-differential mode (SGL/DIF = 0), the MAX1268BEEG+ measures the voltage difference between CH0 and CH1. CH0 serves as IN+, CH1 as IN–. The device samples only the IN+ signal but requires IN– to remain stable within ±0.5 LSB during conversion - achieved by bypassing CH1 to GND with a 0.1µF capacitor.
MAX1268BEEG+ 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:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 420k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1268BEEG+ FAQ
1.How can I place an order for MAX1268BEEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1268BEEG+ 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 MAX1268BEEG+ reliable?
The price and inventory of MAX1268BEEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1268BEEG+ is usually 5 days.
3.What payment methods are accepted for MAX1268BEEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1268BEEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1268BEEG+?
MAX1268BEEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1268BEEG+ 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 MAX1268BEEG+?
For technical support, including MAX1268BEEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1268BEEG+ requirements.
6.How does Aetrix verify that MAX1268BEEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1268BEEG+ 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 MAX1268BEEG+ meets industry standards.
7.What is the process for return or replacement of MAX1268BEEG+?
All MAX1268BEEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1268BEEG+, 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 MAX1268BEEG+ part is unused and in its original packaging.
Return procedure for MAX1268BEEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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