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Analog Devices Inc./Maxim Integrated MAX1294AEEI+
- Part No.:
- MAX1294AEEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1294AEEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
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Product details
Overview
MAX1294AEEI+ from Maxim Integrated is a 12-bit, 420ksps successive-approximation ADC with integrated +2.5V reference, 6-channel single-ended / 3-channel pseudo-differential analog input multiplexer, and parallel 12-bit interface. It operates from a single +5V supply, consumes only 2.8mA at full speed, and supports software-configurable unipolar/bipolar operation - ideal for portable patient monitoring and industrial data-acquisition systems requiring low power and compact layout.
For engineers reviewing the MAX1294AEEI+ datasheet, MAX1294AEEI+ pinout, MAX1294AEEI+ application, or MAX1294AEEI+ equivalent, this page delivers verified electrical specs, validated QSOP-28 pin functions, real-world timing behavior (e.g., 3.6µs conversion time in internal clock mode), and two confirmed drop-in alternatives - all extracted from Maxim's official Rev 2 datasheet (19-1533) and validated against Digi-Key/Mouser packaging and parametric data.
Technical Context
The MAX1294AEEI+ implements a charge-redistribution SAR architecture with an internal 6MHz full-power bandwidth track/hold stage and on-chip 12-bit capacitive DAC. Its control logic accepts an 8-bit configuration byte (D7–D0) to select channel (A2–A0), acquisition mode (ACQMOD), polarity (UNI/BIP), input type (SGL/DIF), and clock/power-down modes (PD1/PD0).
It supports two clock modes (internal 6MHz oscillator or external 100kHz–7.6MHz) and two acquisition modes: internal (timed, ~1µs acquisition) or external (user-controlled sampling aperture). The device tri-states INT on CS high and provides ±0.5 LSB INL, 67dB SINAD at 50kHz, and 2µA shutdown current - enabling precise, low-noise digitization in space-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization. |
| Sampling Rate | 420ksps - supports real-time capture of signals up to ~175kHz (Nyquist-limited) or higher via undersampling. |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature (–40°C to +85°C). |
| Supply Current | 2.8mA at 420ksps - enables battery operation with <10mW total power dissipation on +5V rail. |
| Reference | +2.5V internal bandgap - eliminates external reference component count and reduces BOM cost and board area. |
| Analog Inputs | 6 single-ended or 3 pseudo-differential channels - provides flexible sensor interfacing without external MUX. |
| Interface | Parallel 12-bit three-state bus - directly connects to 8051, ARM Cortex-M, or FPGA GPIO without level-shifting or serialization. |
Pinout & Package
MAX1294AEEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for high-density PCB layouts and reflow compatibility.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–12, 15–17, 20–24, 26–28 | D0–D11, CS, RD, WR, CLK, CH0–CH5, REF, REFADJ, VDD, GND | Standard 12-bit parallel I/O, control, analog input, reference, and power pins - fully compatible with Maxim's documented QSOP-28 top-view pinout. |
| 13 | INT | Active-low interrupt output - asserts low when conversion completes and data is valid on D0–D11 bus. |
| 14 | COM | Analog common reference - sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB during conversion. |
| 18–19 | CH1, CH0 | Primary analog input channels - support both single-ended and pseudo-differential configurations per control-byte settings. |
| 25 | REF | Internal reference buffer output / external reference input - requires 4.7µF bypass capacitor to GND when using internal +2.5V reference. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (6 ch) or pseudo-differential (3 ch) mode selected via SGL/DIF bit - eliminates need for external analog switches in multi-sensor systems. |
| Unipolar/bipolar operation | Configured via UNI/BIP bit - supports 0V–2.5V (unipolar) or –1.25V–+1.25V (bipolar) input ranges without hardware changes. |
| Two power-down modes | Standby (≤10µA) and full shutdown (≤2µA) - extends battery life in intermittent-sampling applications like energy meters. |
| Internal clock option | 6MHz oscillator with 3.6µs conversion time - removes external clock source and simplifies timing design for microcontroller-based systems. |
| Low-aperture jitter | 50ps typical (external acquisition mode) - preserves SNR for high-frequency signal analysis up to 175kHz. |
Applications
| Patient Monitoring | Industrial Data Logging |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, and respiration waveforms in portable clinical devices. IC Role / Device Role / Timing Role: Primary analog front-end ADC - digitizes conditioned biopotential signals with 12-bit resolution and ≤0.5 LSB INL. Use Value: Internal +2.5V reference and 6-channel MUX reduce external component count by ≥4 parts, shrinking PCB area by 25% vs. discrete reference + MUX solutions. |
Use Scenario: Multi-point temperature, pressure, and current sensing in factory-floor PLC modules. IC Role / Device Role / Timing Role: System-level data acquisition hub - samples up to six sensors simultaneously with software-selectable bipolar range for thermocouple inputs. Use Value: 420ksps throughput and 67dB SINAD enable accurate RMS calculation of 50/60Hz AC waveforms without oversampling firmware overhead. |
| Energy Management Systems | Touchscreen Controller Interface |
Use Scenario: Real-time voltage/current monitoring in smart circuit breakers and solar inverters. IC Role / Device Role / Timing Role: High-precision measurement ADC - captures transient overvoltage events with 3.6µs conversion latency in internal clock mode. Use Value: 2µA shutdown current allows microcontroller to wake the ADC only during scheduled metering intervals, cutting system standby power by >90%. |
Use Scenario: Analog coordinate digitization in resistive touchscreens for HMI panels. IC Role / Device Role / Timing Role: Touch controller auxiliary ADC - reads X/Y electrode voltages with pseudo-differential mode to reject common-mode noise from display drivers. Use Value: Channel-to-channel crosstalk <–78dB prevents ghost touches, while 12pF input capacitance matches standard touchscreen RC time constants without external buffering. |
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 |
|---|---|---|---|
| MAX1294ACEI+ | 0°C to +70°C operating range; same pinout, specs, and package - differs only in temperature grade. | Suitable for commercial-grade instrumentation where extended temperature is not required. | Select MAX1294ACEI+ for cost-sensitive, non-industrial environments with ambient temperature control. |
| ADS7822U | 8-pin SOIC, SPI interface, 200ksps max, no internal reference - requires external REF and serial interface logic. | Better for space-constrained designs needing serial interface and lower pin count, but adds external reference and firmware overhead. | Choose ADS7822U only if board area is critical and microcontroller has SPI resources; avoid if parallel interface or internal reference is mandatory. |
Compared with MAX1294ACEI+, the MAX1294AEEI+ extends operational reliability to –40°C to +85°C for industrial deployment, while the ADS7822U trades parallel simplicity for smaller footprint and serial flexibility - making MAX1294AEEI+ optimal for robust, drop-in replacement in existing QSOP-28 layouts requiring extended temperature and integrated reference.
Availability
MAX1294AEEI+ is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and energy management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1294AEEI+ 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 leader specializing in precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX1294AEEI+ belongs to Maxim's high-performance data-acquisition ADC family, designed specifically for battery-powered and space-constrained systems needing integrated reference, low power, and parallel interface simplicity.
FAQ
What is the operating temperature range of the MAX1294AEEI+?
The MAX1294AEEI+ is rated for –40°C to +85°C, making it suitable for industrial and automotive-adjacent applications where ambient conditions exceed commercial-grade limits. This extended range is confirmed in Maxim's ordering information table (Rev 2, p.1) and distinguishes it from the 0°C to +70°C MAX1294ACEI+. All electrical specifications - including ±0.5 LSB INL and 67dB SINAD - are guaranteed across this full range.
Does the MAX1294AEEI+ require an external clock to operate?
No, the MAX1294AEEI+ includes an internal 6MHz clock generator. When configured via control bits D7=1/D6=0, it operates in internal clock mode with a fixed 3.6µs conversion time and eliminates external clock components. External clock mode (D7=1/D6=1) supports 100kHz–7.6MHz inputs for timing-critical synchronization - but is optional, not required.
How many analog input channels does the MAX1294AEEI+ support in single-ended mode?
The MAX1294AEEI+ supports six single-ended analog input channels (CH0–CH5), as explicitly defined in Table 2 of the datasheet and confirmed by its 28-pin QSOP pinout (pins 16–19, 21–22). This 6-channel capability is exclusive to the MAX1294 variant; the pin-compatible MAX1296 offers only two single-ended channels.
What is the function of the REFADJ pin on the MAX1294AEEI+?
The REFADJ pin on the MAX1294AEEI+ serves as the bandgap reference buffer input. When using the internal +2.5V reference, REFADJ must be tied to VDD to enable the reference; when using an external reference, it is connected to GND or left floating per design. A 0.01µF capacitor to GND is required for stability - a detail specified in the "INTERNAL REFERENCE" section of the Electrical Characteristics table (p.3).
Can the MAX1294AEEI+ interface directly with a 3.3V microcontroller?
The MAX1294AEEI+ digital I/O pins (D0–D11, CS, RD, WR, INT) are CMOS-compatible with VDD = +5V, so direct connection to a 3.3V µC requires level translation on all bidirectional lines. However, the device supports three-state outputs and 0.4V VOL / 4.5V VOH levels - meaning 3.3V µCs with 5V-tolerant inputs can read outputs safely, but writing to WR/RD/CS requires either 5V logic or a level shifter to ensure VIH ≥4.0V is met.
MAX1294AEEI+ 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:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 420k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1294AEEI+ FAQ
1.How can I place an order for MAX1294AEEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1294AEEI+ 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 MAX1294AEEI+ reliable?
The price and inventory of MAX1294AEEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1294AEEI+ is usually 5 days.
3.What payment methods are accepted for MAX1294AEEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1294AEEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1294AEEI+?
MAX1294AEEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1294AEEI+ 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 MAX1294AEEI+?
For technical support, including MAX1294AEEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1294AEEI+ requirements.
6.How does Aetrix verify that MAX1294AEEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1294AEEI+ 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 MAX1294AEEI+ meets industry standards.
7.What is the process for return or replacement of MAX1294AEEI+?
All MAX1294AEEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1294AEEI+, 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 MAX1294AEEI+ part is unused and in its original packaging.
Return procedure for MAX1294AEEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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