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Analog Devices Inc./Maxim Integrated MAX1295BEEI+
- Part No.:
- MAX1295BEEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1295BEEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
MAX1295BEEI+ 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 fast 2µs wake-up from shutdown, making it suitable for battery-powered patient monitoring and portable data-acquisition systems.
For engineers reviewing the MAX1295BEEI+ datasheet, MAX1295BEEI+ pinout, MAX1295BEEI+ application, or MAX1295BEEI+ equivalent, key selection criteria include its ±1 LSB INL over –40°C to +85°C, software-configurable unipolar/bipolar operation, tri-state parallel interface timing, and QSOP-28 package compatibility with industrial control and energy management signal chains.
Technical Context
The MAX1295BEEI+ implements a charge-redistribution SAR architecture with an integrated track/hold stage offering 3MHz full-power bandwidth and 250kHz full-linear bandwidth. Its analog input structure supports both single-ended (CH0–CH5) and pseudo-differential (CH0/CH1, CH2/CH3, CH4/CH5) configurations via software-controlled SGL/DIF and address bits A2–A0.
Control logic accepts an 8-bit configuration byte (D7–D0) defining acquisition mode (internal/external), clock source (internal/external), power-down state (full/standby), and input polarity (unipolar/bipolar). The device asserts INT low upon conversion completion and tri-states digital outputs when CS is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output with binary (unipolar) or two's complement (bipolar) format |
| Sampling Rate | 265ksps maximum - enables real-time capture of signals up to 132.5kHz Nyquist bandwidth |
| INL | ±1 LSB over –40°C to +85°C - ensures monotonicity and <0.025% full-scale linearity error in industrial environments |
| Reference | +2.5V internal bandgap reference - eliminates need for external precision reference in space-constrained designs |
| Supply Current | 1.9mA at 265ksps, 2µA in shutdown - supports ultra-low-power operation in intermittent-sampling applications |
| Analog Input Channels | 6 single-ended or 3 pseudo-differential channels - provides flexible sensor interfacing without external MUX |
| Package | 28-pin QSOP - surface-mount footprint compatible with automated assembly and thermal performance up to +85°C ambient |
Pinout & Package
MAX1295BEEI+ is housed in a 28-pin QSOP package with 0.154" body width and standard JEDEC MS-013AC outline. Pin pitch is 0.025", and thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog input channels | Selectable as positive inputs in single-ended mode or paired as differential pairs (e.g., CH0/CH1); all six available only on MAX1295 |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion |
| REF | Reference buffer output / external reference input | Delivers +2.5V internal reference; bypassed with 4.7µF capacitor to GND when internal reference is used |
| REFADJ | Reference buffer bias control | Connect to VDD to disable internal bandgap when using external reference; otherwise bypass with 0.01µF capacitor |
| CS | Active-low chip select | Tri-states D0–D11 and INT when high; enables parallel bus sharing with other peripherals |
| WR | Active-low write strobe | Latches 8-bit control byte on rising edge; initiates acquisition/conversion depending on ACQMOD bit setting |
| RD | Active-low read strobe | Enables 12-bit parallel output on falling edge; clears INT flag on first read cycle |
| CLK | Clock input | Accepts 100kHz–4.8MHz external clock; tied high/low in internal clock mode to prevent floating |
| INT | Interrupt output | Active-low open-drain signal indicating conversion completion and data readiness |
| D0–D11 | Three-state bidirectional data bus | Multiplexed for control byte input and conversion result output; compatible with 16-bit µP data buses |
| VDD | Analog/digital supply | +2.7V to +3.6V single supply; requires 0.1µF ceramic bypass capacitor to GND |
| GND | Analog and digital ground | Common return for analog inputs, reference, and digital I/O; layout separation recommended |
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 external analog switch in multi-sensor systems |
| Unipolar/bipolar input range | 0V to +2.5V (unipolar) or –1.25V to +1.25V (bipolar) - supports both grounded and floating sensor outputs without level-shifting circuitry |
| Two-tier power-down | Standby mode (≤10µA) and full shutdown (2µA) - enables microcontroller-governed sleep/wake cycles in portable instrumentation |
| Internal track/hold with 3MHz BW | Eliminates need for external sample-and-hold IC while supporting undersampling of RF or transient signals beyond Nyquist |
| Parallel 12-bit interface timing | Guaranteed tDO ≤ 110ns and tINT1 ≤ 100ns - interfaces directly with 8051, ARM Cortex-M, and FPGA I/O without glue logic |
Applications
| Patient Monitoring | Industrial Control Systems |
|---|---|
|
Use Scenario: Continuous acquisition of ECG, respiration, and temperature signals in portable clinical devices. IC Role / Device Role / Timing Role: Primary analog front-end ADC converting conditioned biopotential signals at 250–500Hz update rates with <±1 LSB linearity. Use Value: Internal +2.5V reference and 6-channel MUX reduce BOM count and PCB area versus discrete reference + external MUX solutions. |
Use Scenario: Sensor data collection from pressure, flow, and position transducers in PLC-based factory automation. IC Role / Device Role / Timing Role: High-accuracy analog digitizer interfacing with isolated 4–20mA loops and RTD bridges in harsh industrial environments. Use Value: ±1 LSB INL over –40°C to +85°C ensures consistent calibration across operating temperature range without software correction. |
| Data Logging | Energy Management |
|
Use Scenario: Long-duration environmental sensing (temperature, humidity, light) in battery-powered remote nodes. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by microcontroller every 10–60 seconds to minimize average current draw. Use Value: 2µA shutdown current extends coin-cell battery life to >5 years in intermittent-sampling deployments. |
Use Scenario: Real-time voltage/current measurement in smart meters and solar inverter monitoring units. IC Role / Device Role / Timing Role: Precision digitizer capturing AC line waveforms at ≥265ksps for harmonic analysis and power quality metrics. Use Value: 250kHz full-linear bandwidth supports accurate RMS and THD calculation up to 50th harmonic of 50Hz mains. |
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 |
|---|---|---|---|
| MAX1295ACEI | Same 28-pin QSOP package and pinout; ±0.5 LSB INL over 0°C to +70°C (vs. ±1 LSB over –40°C to +85°C) | Targeted at commercial-temperature consumer or lab equipment where extended temperature range is unnecessary | Select MAX1295ACEI only if operating ambient stays within 0°C–70°C and tighter INL is required; MAX1295BEEI+ preferred for industrial deployment |
| ADS7822U | 8-pin SOIC package, SPI interface, 200ksps max, no internal reference - requires external REF and level-shifting for 3V µP | Used in cost-sensitive, low-channel-count applications where serial interface and smaller footprint outweigh parallel speed needs | Choose ADS7822U when board space is critical and µP lacks parallel bus; MAX1295BEEI+ remains optimal for high-throughput, reference-integrated designs |
Compared with MAX1295ACEI, MAX1295BEEI+ trades ±0.5 LSB INL for guaranteed ±1 LSB performance across –40°C to +85°C, enabling drop-in use in automotive-adjacent and outdoor industrial systems. Against ADS7822U, MAX1295BEEI+ delivers higher throughput, integrated reference, and parallel interface - at the cost of larger package and higher pin count.
Availability
MAX1295BEEI+ is available at Aetrix Electronics and suitable for patient monitoring, industrial control systems, data logging, energy management, and touchscreen applications requiring stable component supply across extended temperature ranges.
Supply support for MAX1295BEEI+ 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 MAX1295BEEI+ belongs to Maxim's low-power, high-accuracy SAR ADC product line, engineered specifically for space- and power-constrained data-acquisition systems requiring integrated reference and flexible input configuration.
FAQ
What is the operating temperature range for MAX1295BEEI+?
The MAX1295BEEI+ is rated for continuous operation from –40°C to +85°C. This extended industrial temperature range is confirmed in the Ordering Information table and supported by electrical specifications tested across this full range, including ±1 LSB INL and 1.9mA supply current at 265ksps. The device uses the "E" grade suffix to denote this qualification.
Does MAX1295BEEI+ require an external reference?
No, MAX1295BEEI+ includes a precision +2.5V internal bandgap reference with ±20ppm/°C temperature coefficient and 2.49V to 2.51V output tolerance. An external reference may be used by connecting REFADJ to VDD and applying a stable voltage to the REF pin, but it is not required - the internal reference is fully functional and calibrated.
How many analog input channels does MAX1295BEEI+ support?
MAX1295BEEI+ supports six analog input channels (CH0–CH5) in single-ended mode, or three pseudo-differential channel pairs (CH0/CH1, CH2/CH3, CH4/CH5) when configured via the SGL/DIF control bit. This 6-/3-channel capability is exclusive to the MAX1295 family; the MAX1297 variant offers only two single-ended inputs.
What power-down modes are available on MAX1295BEEI+?
MAX1295BEEI+ provides two software-selectable power-down modes: Standby mode (≤10µA supply current) and Full Power-Down mode (2µA). Both are controlled via PD1/PD0 bits in the 8-bit configuration byte. Exiting either mode takes only 2µs, enabling rapid wake-up for burst-mode sampling without sacrificing energy efficiency.
Is MAX1295BEEI+ pin-compatible with other devices in the MAX1295/MAX1297 family?
Yes, MAX1295BEEI+ shares identical 28-pin QSOP pinout and signal mapping with all MAX1295 variants (e.g., MAX1295ACEI, MAX1295AEEI). It is not pin-compatible with MAX1297 devices, which use a 24-pin QSOP package and omit CH2–CH5 pins. Direct substitution among MAX1295-grade parts requires no PCB changes.
MAX1295BEEI+ 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:
- 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+ FAQ
1.How can I place an order for MAX1295BEEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1295BEEI+ 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+ reliable?
The price and inventory of MAX1295BEEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1295BEEI+ is usually 5 days.
3.What payment methods are accepted for MAX1295BEEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1295BEEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1295BEEI+?
MAX1295BEEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1295BEEI+ 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+?
For technical support, including MAX1295BEEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1295BEEI+ requirements.
6.How does Aetrix verify that MAX1295BEEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1295BEEI+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1295BEEI+?
All MAX1295BEEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1295BEEI+, 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+ part is unused and in its original packaging.
Return procedure for MAX1295BEEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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