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Analog Devices Inc./Maxim Integrated MAX1295BCEI+
- Part No.:
- MAX1295BCEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1295BCEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,922
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Product details
Overview
MAX1295BCEI+ from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 6-channel single-ended/3-channel pseudo-differential analog input, and parallel 12-bit interface. It operates from a single +2.7V to +3.6V supply, consumes only 1.9mA at full speed, and features automatic power-down (2µA) and fast wake-up (2µs). It is used in portable patient monitoring systems requiring low-power, high-accuracy analog digitization.
For engineers reviewing the MAX1295BCEI+ datasheet, MAX1295BCEI+ pinout, MAX1295BCEI+ application, or MAX1295BCEI+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in the official MAX1295/MAX1297 datasheet Rev 3 (12/02).
Technical Context
The MAX1295BCEI+ implements a SAR architecture with an internal 3MHz full-power bandwidth track-and-hold stage and supports both internal and external clock modes via control bits D6/D7. Its analog front-end allows runtime selection of unipolar/bipolar and single-ended/pseudo-differential operation using a software-configurable multiplexer.
Conversion is initiated by writing an 8-bit control byte (D7–D0) that sets channel address (A2–A0), acquisition mode (ACQMOD), polarity (UNI/BIP), input type (SGL/DIF), and power-down state (PD1/PD0). INT asserts low upon conversion completion and tri-states when CS goes high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise analog measurement |
| Sampling Rate | 265ksps - supports real-time capture of signals up to ~132kHz Nyquist bandwidth |
| INL | ±1 LSB - ensures monotonicity and <0.024% full-scale linearity error across temperature |
| Supply Voltage | +2.7V to +3.6V - compatible with standard 3V logic rails and battery-powered designs |
| Reference | +2.5V internal - eliminates need for external reference; TCREF = ±20ppm/°C |
| Power Consumption | 1.9mA at 265ksps - enables >500hr operation on a 1000mAh Li-ion cell |
| Package | 28-pin QSOP - 5.3mm × 11.6mm footprint suitable for space-constrained medical PCBs |
Pinout & Package
MAX1295BCEI+ is housed in a 28-pin QSOP package (5.3mm × 11.6mm, 0.65mm pitch) with exposed pad not electrically connected. Pin functions are validated per Maxim's official pin description table (Rev 3, p.7–8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog Input Channels | Selectable as IN+ in single-ended mode or paired as IN+/IN− in pseudo-differential mode |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion |
| REF / REFADJ | Reference Buffer I/O | REF outputs +2.5V internal reference; REFADJ disables internal ref when tied to VDD |
| D0–D11 | Three-State Parallel Data Bus | Outputs 12-bit result in unipolar (binary) or bipolar (two's complement) format |
| CS, WR, RD | Digital Control Inputs | Enable chip select, latch configuration/control byte, and read data - fully compatible with 8051/68k-style µP timing |
| INT | Interrupt Output | Active-low open-drain signal indicating conversion completion and data readiness |
| VDD / GND | Power & Ground | Single analog supply rail; requires local 0.1µF ceramic bypass at VDD pin |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime selection between 6-channel single-ended or 3-channel pseudo-differential via SGL/DIF bit |
| Two power-down modes | Standby (10µA) and full shutdown (2µA) - reduces average current in burst-sampling applications |
| Internal track-and-hold | 3MHz full-power bandwidth enables accurate sampling of fast transients without external circuitry |
| Tri-state INT output | INT goes high-impedance when CS is high - simplifies bus sharing in multi-peripheral µP systems |
| Flexible clocking | Supports internal clock (no external oscillator needed) or external clock (100kHz–4.8MHz) via D6/D7 control bits |
Applications
| Patient Monitoring | Industrial Data Logging |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, and respiration waveforms in handheld vital signs monitors. IC Role / Device Role / Timing Role: Primary analog front-end digitizer converting conditioned biopotential signals into 12-bit digital streams synchronized to µP interrupt. Use Value: Low 1.9mA active current extends battery life; ±1 LSB INL ensures clinical-grade amplitude accuracy per AAMI EC11. |
Use Scenario: Multi-sensor environmental logging (temperature, humidity, pressure) in remote industrial nodes. IC Role / Device Role / Timing Role: Central ADC managing six sensor inputs via software-controlled MUX, triggered by µP scheduler. Use Value: 6-channel single-ended support eliminates external multiplexers; 2µA shutdown enables years of operation on primary cells. |
| Energy Management Systems | Touchscreen Controllers |
Use Scenario: Real-time voltage/current sampling in smart meter anti-tampering circuits and harmonic analysis modules. IC Role / Device Role / Timing Role: High-speed acquisition engine capturing AC line cycles at 265ksps for FFT-based power quality metrics. Use Value: 3MHz T/H bandwidth supports undersampling of 50/60Hz fundamentals with harmonics up to 3rd order. |
Use Scenario: Digitizing resistive touchscreen panel voltages in kiosk and HMI devices with limited board space. IC Role / Device Role / Timing Role: Low-pin-count ADC interfacing directly to 4-wire touch controller ASIC via parallel bus. Use Value: 28-pin QSOP footprint fits tight layout constraints; software-configurable COM reference simplifies panel biasing. |
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 |
|---|---|---|---|
| MAX1294ACEI+ | +5V supply only; identical pinout and register map but higher supply current (3.5mA @ 265ksps) | Requires level-shifting in 3V systems; better noise immunity in noisy industrial environments | Choose when legacy +5V infrastructure exists and 3V compatibility is not required |
| ADS7822U | 2.7V–5.25V supply; SPI interface (not parallel); 1MSPS max rate; no internal reference | Needs external reference and µP SPI peripheral; smaller 8-pin SOIC package | Prefer when board space is critical and µP lacks parallel port but has SPI available |
Compared with MAX1295BCEI+, MAX1294ACEI+ offers identical functionality at +5V but increases system power and requires voltage translation in 3V designs, while ADS7822U trades parallel simplicity for compactness and higher speed at the cost of added external components and interface redesign.
Availability
MAX1295BCEI+ is available at Aetrix Electronics and suitable for patient monitoring, industrial data logging, and energy management applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for MAX1295BCEI+ 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 markets.
The MAX1295BCEI+ belongs to Maxim's precision data-acquisition product line, designed specifically for battery-powered instrumentation where low power, small size, and integrated reference are essential.
FAQ
What is the operating temperature range for the MAX1295BCEI+?
The MAX1295BCEI+ is rated for 0°C to +70°C ambient operation, as confirmed in the Ordering Information table (Rev 3, p.2). This commercial-grade temperature range suits indoor medical devices, portable test equipment, and non-automotive industrial applications where extended thermal margins are not required. The device maintains ±1 LSB INL and 1.9mA supply current across this full range.
Does the MAX1295BCEI+ require an external clock to operate?
No - the MAX1295BCEI+ supports both internal and external clock modes. When D7=1 and D6=0 in the control byte, the internal oscillator activates, delivering a fixed 3.6µs conversion time. In this mode, the CLK pin must be tied to VDD or GND to prevent floating. External clock operation (D7=D6=1) accepts 100kHz–4.8MHz TTL/CMOS signals for precise timing control.
How many analog input channels does the MAX1295BCEI+ support in single-ended mode?
The MAX1295BCEI+ supports six analog input channels (CH0–CH5) in single-ended mode, as explicitly stated in the General Description and Table 2 of the datasheet. This is a defining feature distinguishing it from the 2-channel MAX1297 variant. Channel selection is performed via A2/A1/A0 bits in the control byte, enabling flexible routing without external multiplexers.
Can the internal reference of the MAX1295BCEI+ be disabled?
Yes - the internal +2.5V reference can be disabled by connecting the REFADJ pin to VDD, as specified in the Pin Description (p.8) and Electrical Characteristics (p.3). Doing so disables the internal bandgap buffer and allows an external reference (up to +3.6V) to be applied at the REF pin, improving system-level accuracy when a higher-stability reference is available.
What is the maximum allowed analog input voltage range for the MAX1295BCEI+?
The absolute analog input voltage range for the MAX1295BCEI+ is GND to VDD (per Note 6, p.3), but for accurate conversions near full scale, inputs must stay within (GND − 50mV) to (VDD + 50mV). In unipolar mode with internal reference, the valid input span is 0V to +2.5V; in bipolar mode, it is −1.25V to +1.25V referenced to COM. Exceeding these ranges risks measurement error or damage if current exceeds 4mA.
MAX1295BCEI+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1295BCEI+ FAQ
1.How can I place an order for MAX1295BCEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1295BCEI+ 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 MAX1295BCEI+ reliable?
The price and inventory of MAX1295BCEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1295BCEI+ is usually 5 days.
3.What payment methods are accepted for MAX1295BCEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1295BCEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1295BCEI+?
MAX1295BCEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1295BCEI+ 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 MAX1295BCEI+?
For technical support, including MAX1295BCEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1295BCEI+ requirements.
6.How does Aetrix verify that MAX1295BCEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1295BCEI+ 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 MAX1295BCEI+ meets industry standards.
7.What is the process for return or replacement of MAX1295BCEI+?
All MAX1295BCEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1295BCEI+, 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 MAX1295BCEI+ part is unused and in its original packaging.
Return procedure for MAX1295BCEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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