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Analog Devices Inc./Maxim Integrated MAX1295BEEI+T
- Part No.:
- MAX1295BEEI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1295BEEI+T.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,392
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Product details
Overview
MAX1295BEEI+T from Maxim Integrated is a low-power, 12-bit successive-approximation ADC with internal +2.5V reference, 265ksps sampling rate, and 6-channel single-ended / 3-channel pseudo-differential analog input multiplexer. It operates from a single +2.7V to +3.6V supply and features automatic power-down (2µA shutdown current), fast wake-up (2µs), and parallel 12-bit interface - ideal for battery-powered patient monitoring and industrial data-logging systems.
For engineers reviewing the MAX1295BEEI+T datasheet, MAX1295BEEI+T pinout, MAX1295BEEI+T application, or MAX1295BEEI+T equivalent, key selection criteria include its -40°C to +85°C extended temperature grade, ±1 LSB INL accuracy, QSOP-28 package compatibility, and software-configurable unipolar/bipolar input mode - all critical for space-constrained, low-power embedded measurement designs.
Technical Context
The MAX1295BEEI+T implements a 12-bit SAR architecture with integrated track/hold (3MHz full-power bandwidth) and on-chip clock generation. Its analog front-end supports six single-ended or three pseudo-differential input channels via software-controlled multiplexer, with COM-referenced zero-code alignment and ±0.5 LSB DNL over temperature.
Conversion is initiated by a control byte written to D7–D0, configuring acquisition mode (internal/external), clock source (internal/external), polarity (unipolar/bipolar), and channel address (A2–A0). INT asserts low upon completion, and the parallel bus tri-states outputs when CS is high - enabling direct interfacing with 16-bit microprocessor data buses without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output with binary (unipolar) or two's complement (bipolar) format - ensures precise digitization of sensor signals across full-scale ranges. |
| Sampling Rate | 265ksps maximum - supports real-time capture of dynamic waveforms in energy management and touch-screen controllers. |
| INL Accuracy | ±1 LSB (max) over -40°C to +85°C - guarantees monotonicity and linearity for calibration-critical industrial control applications. |
| Supply Current | 1.9mA at 265ksps, 2µA in shutdown - enables multi-year operation on coin-cell batteries in portable medical devices. |
| Analog Input Range | 0V to VREF (unipolar) or -VREF/2 to +VREF/2 (bipolar) - accommodates both ground-referenced and differential-sensing topologies without external level-shifting. |
| Reference | +2.5V internal bandgap reference (±20ppm/°C TC) - eliminates need for external precision reference in cost-sensitive designs. |
| Package | 28-pin QSOP (5.3mm × 10.2mm) - provides compact footprint while maintaining standard surface-mount assembly compatibility. |
Pinout & Package
MAX1295BEEI+T is housed in a 28-pin QSOP package with exposed pad (not thermally enhanced), requiring standard reflow profile and 0.1µF VDD bypassing per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog input channels | Supports 6 single-ended or 3 pseudo-differential pairs; CH0–CH5 active only in MAX1295 variant - enables multi-sensor monitoring from one IC. |
| COM | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion - requires low-noise grounding and local 0.1µF decoupling. |
| REF / REFADJ | Reference buffer I/O | REF outputs +2.5V internal reference (bypassed with 4.7µF); REFADJ disables internal ref when tied to VDD - allows seamless transition to external reference if needed. |
| D0–D11 | Three-state parallel data bus | 12-bit bidirectional I/O lines; tri-stated when CS = high - permits shared bus operation with other peripherals without contention. |
| CS / WR / RD / INT | Digital control interface | Standard 8080-style parallel timing: WR latches config byte, RD reads result, INT flags completion, CS enables bus - no external address decoding required. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Selects single-ended (6 ch) or pseudo-differential (3 ch) mode via SGL/DIF bit - adapts to varying sensor signal types without hardware change. |
| Two power-down modes | Standby (10µA) and full shutdown (2µA) - extends battery life in intermittent-sampling applications like wireless sensor nodes. |
| Internal clock option | Eliminates external clock source; fixed 3.6µs conversion time - reduces BOM count and PCB area in microcontroller-based systems. |
| Aperture jitter ≤ 200ps | Enables accurate digitization of high-frequency transients up to 125kHz (SINAD > 68dB) - suitable for ultrasound front-ends and motor current sensing. |
| Input protection diodes | Clamps analog inputs to GND–300mV / VDD+300mV - prevents damage from ESD or overvoltage events in harsh industrial environments. |
Applications
| Industrial Control Systems | Patient Monitoring |
|---|---|
Use Scenario: Real-time acquisition of temperature, pressure, and flow sensor outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC converting multiple 4–20mA loop signals with simultaneous sampling capability and low latency interrupt signaling. Use Value: ±1 LSB INL and 265ksps throughput ensure accurate closed-loop control response within <15µs system timing budget. |
Use Scenario: Front-end digitization of ECG, SpO₂, and respiration waveforms in portable bedside monitors. IC Role / Device Role / Timing Role: Low-power, multi-channel ADC with bipolar input support for biopotential signal conditioning and noise rejection. Use Value: 2µA shutdown current and fast wake-up enable duty-cycled operation, extending battery runtime beyond 72 hours per charge. |
| Data Logging | Energy Management |
Use Scenario: Standalone environmental sensor node recording temperature, humidity, and light intensity over weeks. IC Role / Device Role / Timing Role: Primary data converter interfaced directly to MCU GPIOs via parallel bus, minimizing firmware overhead. Use Value: Internal +2.5V reference and 6-channel mux eliminate external components, reducing total solution size by 35% vs. discrete ADC + reference design. |
Use Scenario: Smart metering subsystem measuring AC voltage/current harmonics and power quality parameters. IC Role / Device Role / Timing Role: High-fidelity ADC capturing 50/60Hz fundamentals plus 250kHz full-linear bandwidth for harmonic analysis. Use Value: 3MHz full-power bandwidth and 76dB channel-to-channel crosstalk support accurate multi-phase measurements without inter-channel interference. |
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, 200ksps max, no internal reference - requires external REF and level-shifting for 3V operation. | Lower precision; suited for cost-sensitive, non-critical sensor readouts where 12-bit linearity is unnecessary. | Choose ADS7822U only if resolution ≤ 8 bits suffices and serial interface simplifies routing in dense layouts. |
| MAX11607ETE+ | 12-bit, I²C interface, 94.4ksps, internal reference, 16-pin TQFN - lacks parallel bus and multi-channel mux flexibility. | Targeted at low-pin-count, low-throughput systems; no software-selectable unipolar/bipolar mode. | Prefer MAX11607ETE+ when I²C integration, smaller footprint, and lower power at sub-100ksps rates outweigh parallel interface needs. |
Compared with ADS7822U and MAX11607ETE+, the MAX1295BEEI+T uniquely delivers 12-bit parallel-output performance with integrated reference, 6-channel flexibility, and extended temperature operation - making it the optimal choice for high-accuracy, space-constrained industrial and medical data-acquisition systems requiring minimal external components.
Availability
MAX1295BEEI+T is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and energy management equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1295BEEI+T 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, high accuracy, and small form factor.
The MAX1295BEEI+T belongs to Maxim's low-power SAR ADC product line, engineered specifically for battery-operated and space-constrained measurement systems requiring high DC accuracy and flexible input configuration without external support components.
FAQ
What is the operating temperature range for the MAX1295BEEI+T?
The MAX1295BEEI+T is rated for -40°C to +85°C operation, meeting extended industrial temperature requirements. This grade is confirmed in the Ordering Information table where "BEEI" suffix denotes the -40°C to +85°C range, and electrical specifications (e.g., ±1 LSB INL, 1.9mA supply current) are guaranteed across this full range.
Does the MAX1295BEEI+T require an external clock source?
No - the MAX1295BEEI+T supports both internal and external clock modes. When configured for internal clock (D7=1, D6=0 in control byte), it generates its own 3.6µs conversion timing and the CLK pin must be tied high or low to prevent floating. External clock mode (D7=D6=1) accepts 100kHz–4.8MHz TTL/CMOS signals.
How many analog input channels does the MAX1295BEEI+T support?
The MAX1295BEEI+T supports six single-ended analog input channels (CH0–CH5) or three pseudo-differential pairs (CH0/CH1, CH2/CH3, CH4/CH5), as explicitly defined in Table 2 and Table 3 of the datasheet. This 6-/3-channel capability distinguishes it from the 2-/1-channel MAX1297 variant.
What is the reference voltage specification for the MAX1295BEEI+T?
The MAX1295BEEI+T integrates a +2.5V internal bandgap reference with ±20ppm/°C temperature coefficient and ±100mV adjustability via REFADJ. Output voltage is guaranteed 2.49V to 2.51V at TA = +25°C, and remains stable across -40°C to +85°C with 4.7µF capacitor at REF pin per datasheet Figure 1.
Can the MAX1295BEEI+T operate with a 2.7V supply?
Yes - the MAX1295BEEI+T is fully specified for analog supply voltage (VDD) from +2.7V to +3.6V. At 2.7V, typical supply current is 1.6mA (265ksps, internal reference), and all DC accuracy specs (e.g., ±1 LSB INL, ±4 LSB gain error) remain valid per Electrical Characteristics table Conditions column.
MAX1295BEEI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1295BEEI+T FAQ
1.How can I place an order for MAX1295BEEI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1295BEEI+T 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 MAX1295BEEI+T reliable?
The price and inventory of MAX1295BEEI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1295BEEI+T is usually 5 days.
3.What payment methods are accepted for MAX1295BEEI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1295BEEI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1295BEEI+T?
MAX1295BEEI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1295BEEI+T 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 MAX1295BEEI+T?
For technical support, including MAX1295BEEI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1295BEEI+T requirements.
6.How does Aetrix verify that MAX1295BEEI+T is sourced from the original manufacturer or authorized distributors?
All MAX1295BEEI+T 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 MAX1295BEEI+T meets industry standards.
7.What is the process for return or replacement of MAX1295BEEI+T?
All MAX1295BEEI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1295BEEI+T, 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 MAX1295BEEI+T part is unused and in its original packaging.
Return procedure for MAX1295BEEI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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