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Analog Devices Inc./Maxim Integrated MAX1293BEEG
- Part No.:
- MAX1293BEEG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1293BEEG.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,313
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Product details
Overview
MAX1293BEEG from Maxim Integrated is a 12-bit, 250ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 4-channel single-ended or 2-channel pseudo-differential analog input multiplexer, and byte-wide parallel (8+4) interface. It operates from a single +3V analog supply and supports digital logic levels from +1.8V to +3.6V via dedicated VLOGIC pin, enabling direct interfacing with low-voltage microcontrollers in portable data-acquisition systems.
For engineers reviewing the MAX1293BEEG datasheet, MAX1293BEEG pinout, MAX1293BEEG application, or MAX1293BEEG equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain support details specific to industrial and medical embedded designs requiring low-power, high-accuracy sampling.
Technical Context
The MAX1293BEEG implements a charge-redistribution SAR architecture with an internal track/hold stage offering 3MHz full-power bandwidth and 250kHz full-linear bandwidth. Its control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), unipolar/bipolar range, and single-ended/pseudo-differential input topology - all without external timing components.
Conversion timing is deterministic: 13 clock cycles per conversion, with internal clock mode delivering 3.6µs conversion time and external clock mode supporting 100kHz–4.8MHz input. The HBEN pin enables 12-bit result multiplexing across an 8-bit data bus, reducing I/O count while preserving resolution integrity for µP interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610µV at 2.5V reference, sufficient for 0.025% full-scale accuracy in sensor signal chains. |
| Sampling Rate | 250ksps - supports Nyquist-limited acquisition of signals up to 125kHz, suitable for vibration monitoring and ECG front-ends. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% integral nonlinearity over temperature, critical for closed-loop control feedback. |
| Power Consumption | 1.9mA at 250ksps - enables battery operation >100 hours on a 200mAh coin cell when paired with sleep-mode sequencing. |
| Reference | +2.5V internal - eliminates external reference component, reduces BOM cost, and maintains ±2ppm/°C drift for stable calibration across -40°C to +85°C. |
| Analog Inputs | 4 single-ended or 2 pseudo-differential channels - matches typical multi-sensor industrial nodes (e.g., temp/pressure/humidity) without external MUX. |
| Supply Range | VDD = +2.7V to +3.6V, VLOGIC = +1.8V to +3.6V - allows coexistence with 1.8V FPGAs and 3.3V MCUs on shared PCB rails. |
Pinout & Package
MAX1293BEEG is housed in a 24-pin QSOP package (5.0mm × 7.5mm, 0.635mm pitch), optimized for space-constrained PCB layouts in handheld instrumentation and modular I/O modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HBEN | High-byte enable control | Selects MSB nibble (D8–D11) or LSB byte (D0–D7) on shared 8-bit bus - enables compact µP interface without data bus widening. |
| D0/D8–D7/D11 | Three-state bidirectional data I/O | Multiplexed 12-bit output: D0–D7 carry LSBs when HBEN=0; D0–D3 and D8–D11 carry MSBs when HBEN=1 - reduces FPGA/MCU pin count by 4. |
| INT | Open-drain interrupt output | Active-low pulse signals conversion completion; tri-states when CS high - simplifies interrupt routing in multi-peripheral systems. |
| WR / RD / CS | Control strobes | Standard 8080-style parallel interface: WR latches config byte/start conversion; RD reads result; CS enables digital outputs - no custom logic required. |
| CH0–CH3 | Analog input channels | Four single-ended inputs referenced to COM; configurable as two pseudo-differential pairs (CH0/CH1, CH2/CH3) - supports differential sensor bridges with common-mode rejection. |
| REF / REFADJ | Internal reference control | REF outputs +2.5V; REFADJ disables internal bandgap when tied to VDD - allows seamless transition to external precision reference if needed. |
| VLOGIC | Digital supply rail | Decouples logic-level voltage from analog supply - permits direct connection to 1.8V or 2.5V I/O domains without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (4 ch) or pseudo-differential (2 ch) mode selected via control byte - eliminates hardware rework when sensor interface requirements change. |
| Two power-down modes | Standby (10µA) and full shutdown (2µA) - enables µA-level system sleep current in battery-powered loggers between sampling intervals. |
| Internal 3MHz track/hold | Supports undersampling of transient events (e.g., motor startup spikes) without external anti-alias filter - reduces passive component count and board area. |
| Aperture jitter <50ps (external acquisition) | Enables accurate phase-sensitive measurements (e.g., power factor, impedance spectroscopy) without external clock conditioning circuitry. |
| Unipolar/bipolar range selection | Configurable via control bit: 0–2.5V (unipolar) or ±1.25V (bipolar) - accommodates both DC-coupled sensors and AC-coupled transducer outputs. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-mounted I/O modules. IC Role / Device Role / Timing Role: Primary ADC for 4-channel analog front-end; samples synchronized to 1ms system timer; provides INT-driven burst reads to reduce µP polling overhead. Use Value: Low 1.9mA active current extends module runtime on backup supercaps; 24-pin QSOP footprint fits dense DIN-rail carrier boards. |
Use Scenario: Portable ECG monitor acquiring lead-I, lead-II, respiration, and SpO₂ analog signals. IC Role / Device Role / Timing Role: Dual-role ADC: CH0/CH1 in pseudo-differential mode for ECG leads; CH2/CH3 in single-ended mode for auxiliary sensors - single-chip solution replaces discrete MUX + ADC. Use Value: ±0.5 LSB INL ensures diagnostic-grade waveform fidelity; internal reference eliminates drift-induced baseline wander in 24-hour recordings. |
| Energy Metering Subsystem | Touch-Screen Controller Interface |
Use Scenario: Sampling shunt voltage and CT secondary outputs in Class 0.5 electricity meters. IC Role / Device Role / Timing Role: High-accuracy ADC for metrology path; configured in bipolar mode for bidirectional current sensing; uses external clock for precise sampling alignment with zero-crossing detection. Use Value: 70dB SINAD and 80dB SFDR meet IEC 62053-22 harmonic distortion requirements; 250ksps rate captures 50/60Hz fundamentals plus 21st harmonics. |
Use Scenario: Resistive touch-screen digitizer in kiosk or HMI panel measuring X/Y electrode voltages. IC Role / Device Role / Timing Role: Dedicated ADC for touch controller ASIC; 4-channel single-ended mode scans X+, X−, Y+, Y− electrodes sequentially; fast wake-up (2µs) minimizes touch latency. Use Value: 2µs wake-up + 3.6µs conversion enables <100µs total scan time per coordinate - supports >100Hz touch reporting rates with low motion blur. |
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, 200ksps max rate | Lacks 12-bit precision and parallel interface; requires external ref and level-shifting for 1.8V logic | Choose only if 8-bit resolution suffices and SPI bus is preferred over parallel; not drop-in compatible. |
| AD7490BRUZ | 12-bit, 1MSPS, SPI, internal ref, 16-channel mux, 2.7–5.25V supply | Higher speed but SPI-only interface; larger 24-TSSOP package; no VLOGIC pin for independent logic voltage | Prefer for high-channel-count, high-speed systems where SPI integration outweighs parallel interface benefits. |
Compared with MAX1293BEEG, ADS7822U trades resolution and interface simplicity for lower cost and smaller size, while AD7490BRUZ offers higher throughput and channel density at the expense of µP interface compatibility and VLOGIC flexibility - making MAX1293BEEG optimal for space-constrained, low-power, parallel-bus-based 4-channel systems.
Availability
MAX1293BEEG is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touch-screen controller interfaces requiring stable component supply across extended product lifecycles.
Supply support for MAX1293BEEG 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 industrial, medical, and communications applications - emphasizing low power, small size, and high reliability.
The MAX1293BEEG belongs to Maxim's low-power, high-accuracy SAR ADC family targeting portable and battery-operated measurement systems where resolution, power efficiency, and integration must coexist without sacrificing µP interface simplicity.
FAQ
What is the operating temperature range for MAX1293BEEG?
The MAX1293BEEG is specified for operation from -40°C to +85°C, matching industrial and medical environmental requirements. This extended range is confirmed in the Absolute Maximum Ratings table and supported by characterization data across temperature for parameters including INL, gain error, and supply current - ensuring reliable performance in uncontrolled ambient conditions without derating.
Does MAX1293BEEG require an external crystal or clock source?
No, MAX1293BEEG does not require an external crystal. It features an internal 3MHz clock generator usable in internal clock mode (configured via D7/D6 bits). External clock mode accepts 100kHz–4.8MHz TTL/CMOS signals on the CLK pin - eliminating crystal oscillators, load capacitors, and associated layout constraints while maintaining timing flexibility.
How many analog input channels does MAX1293BEEG support in single-ended mode?
MAX1293BEEG supports four single-ended analog input channels (CH0–CH3), as explicitly stated in the General Description and Pin Configurations section. This is distinct from the MAX1291 (8-channel variant) and is validated by the MAX1293-specific Figure 3b schematic and Table 3 channel mapping - confirming hardware-level channel count limitation.
Can MAX1293BEEG interface directly with a 1.8V microcontroller?
Yes, MAX1293BEEG can interface directly with a 1.8V microcontroller using its dedicated VLOGIC pin. When VLOGIC is supplied at +1.8V, all digital I/Os (D0–D11, INT, RD, WR, CS, HBEN) operate at 1.8V logic levels with VIH = 0.5V and VOL = 0.4V - meeting standard 1.8V CMOS thresholds without level translators or pull-up resistors.
What is the purpose of the HBEN pin on MAX1293BEEG?
The HBEN (High Byte Enable) pin on MAX1293BEEG controls multiplexing of the 12-bit conversion result onto an 8-bit data bus: when HBEN = 1, D0–D3 and D8–D11 output the four MSBs; when HBEN = 0, D0–D7 output the eight LSBs. This enables full 12-bit resolution using only 8 data lines - reducing µP port usage and PCB trace count in resource-constrained designs.
MAX1293BEEG 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:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 2, 4
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1293BEEG FAQ
1.How can I place an order for MAX1293BEEG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1293BEEG 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 MAX1293BEEG reliable?
The price and inventory of MAX1293BEEG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1293BEEG is usually 5 days.
3.What payment methods are accepted for MAX1293BEEG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1293BEEG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1293BEEG?
MAX1293BEEG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1293BEEG 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 MAX1293BEEG?
For technical support, including MAX1293BEEG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1293BEEG requirements.
6.How does Aetrix verify that MAX1293BEEG is sourced from the original manufacturer or authorized distributors?
All MAX1293BEEG 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 MAX1293BEEG meets industry standards.
7.What is the process for return or replacement of MAX1293BEEG?
All MAX1293BEEG units undergo pre-shipment inspection (PSI). If there is an issue with MAX1293BEEG, 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 MAX1293BEEG part is unused and in its original packaging.
Return procedure for MAX1293BEEG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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