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Analog Devices Inc./Maxim Integrated MAX1275BETC+
- Part No.:
- MAX1275BETC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1275BETC+.pdf
- Description:
- IC ADC 12BIT 1.8MSPS 12-TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
MAX1275BETC+ from Maxim Integrated is a 12-bit, true-differential, single-supply analog-to-digital converter (ADC) with 1.8Msps throughput, ±1.75 LSB INL, bipolar input range (–VREF/2 to +VREF/2), and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for high-accuracy motor control and industrial data acquisition systems.
For engineers reviewing the MAX1275BETC+ datasheet, MAX1275BETC+ pinout, MAX1275BETC+ application, or MAX1275BETC+ equivalent, this page delivers verified specifications, validated pin functions, confirmed bipolar-input timing behavior, and real-world selection guidance for precision ADC replacement in embedded signal chains.
Technical Context
The MAX1275BETC+ employs a successive-approximation register (SAR) architecture with an internal true-differential track-and-hold (T/H), enabling noise-immune sampling of bipolar analog signals without pipeline delay. Its conversion is initiated by CNVST falling edge and clocked by SCLK, requiring exactly 16 clock cycles per 12-bit result plus 3 leading zeros.
It operates from a single +4.75V to +5.25V analog supply (VDD) and a separate 1.8V–VDD digital logic supply (VL), supporting direct interfacing to low-voltage microcontrollers. Full power-down mode reduces VDD current to 1µA max, while partial power-down maintains 1mA typical consumption between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 1.8Msps maximum - supports real-time digitization of signals up to 20MHz small-signal bandwidth via undersampling. |
| INL (Max) | ±1.75 LSB - ensures monotonicity and <0.043% full-scale linearity error for calibrated measurement systems. |
| Differential Input Range | –VREF/2 to +VREF/2 - enables direct acquisition of AC-coupled or centered bipolar sensor outputs (e.g., accelerometers, current shunts). |
| Power-Down Current | 1µA max (full power-down) - extends battery life in portable instrumentation and intermittent-scan applications. |
| SPI Interface Speed | 28.8MHz SCLK - allows complete 12-bit readout in ≤556ns, minimizing bus occupancy in high-throughput DSP interfaces. |
| Reference Requirement | External VREF (1.0V to VDD+50mV) - decouples accuracy from supply rails and enables system-level gain calibration. |
Pinout & Package
MAX1275BETC+ is housed in a 12-pin 3mm × 3mm TQFN package with exposed paddle (EP), rated for –40°C to +85°C operation. Pin 1 is AIN–, pin 12 is AIN+, and EP is internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AIN–) | Negative analog input | Completes true-differential pair with AIN+; accepts –VREF/2 to +VREF/2 relative to RGND for bipolar signal capture. |
| 2 (REF) | External reference voltage input | Sets full-scale range; requires 4.7µF + 0.01µF bypassing to RGND for stable DC accuracy and AC performance. |
| 3 (RGND) | Reference ground | Must be connected to system GND; separates analog reference return path from noisy digital/power grounds. |
| 4 (VDD) | Analog supply voltage (+4.75V to +5.25V) | Powers analog core and T/H; bypassed with 10µF + 0.01µF to GND to suppress switching noise. |
| 5, 11 (N.C.) | No connection | Unbonded pins; must remain unconnected and unpopulated on PCB layout. |
| 6 (GND) | Digital/analog ground | Internally tied to EP; serves as common return for VDD, VL, and digital I/O; connects to system ground plane. |
| 7 (VL) | Digital logic supply (1.8V to VDD) | Enables direct interface to 1.8V/2.5V/3.3V/5V controllers; bypassed with 10µF + 0.01µF to GND. |
| 8 (DOUT) | Serial data output | Three-state CMOS output; drives MSB-first 12-bit result preceded by three zeros after CNVST falling edge. |
| 9 (CNVST) | Convert start input | Active-low control: falling edge initiates T/H hold and conversion; rising edge controls power-down entry/exit timing. |
| 10 (SCLK) | Serial clock input | Drives conversion timing and data shift-out; supports SPI/QSPI/MICROWIRE modes up to 28.8MHz. |
| 12 (AIN+) | Positive analog input | Completes true-differential pair with AIN–; differential voltage AIN+ – AIN– defines conversion result. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential T/H input stage | Rejects common-mode noise >60dB and improves SFDR by ≥5dB vs. single-ended inputs at 525kHz. |
| No pipeline delay | Delivers deterministic latency of exactly 16 SCLK cycles - critical for closed-loop motor control timing predictability. |
| Separate VL supply rail | Eliminates level-shifting components when interfacing with 1.8V FPGAs or ultra-low-power MCUs. |
| 70dB SINAD at 525kHz | Supports accurate spectral analysis of baseband signals in communications and vibration monitoring. |
| Bipolar two's complement output | Directly compatible with DSP arithmetic units; simplifies software sign handling in motor phase current sensing. |
Applications
| Motor Phase Current Sensing | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Real-time sampling of bidirectional current through motor windings using shunt resistors with center-tapped bias. IC Role / Device Role / Timing Role: Bipolar ADC capturing ±500mV differential signals at 1.8Msps with sub-µs aperture jitter for field-oriented control (FOC) loops. Use Value: Enables precise torque ripple reduction and efficient PWM synchronization without external op-amp level shifting. |
Use Scenario: High-channel-count sensor hub acquiring thermocouple, strain gauge, and pressure transducer outputs in PLC backplanes. IC Role / Device Role / Timing Role: Low-power, externally referenced ADC delivering ±1.75 LSB INL across –40°C to +85°C for calibrated multi-sensor fusion. Use Value: Reduces system calibration overhead and eliminates need for on-board reference ICs or trimming resistors. |
| Base Station RF Front-End Monitoring | Portable Test Equipment |
|
Use Scenario: Digitizing IF signals and power amplifier feedback paths in LTE/5G remote radio units with tight EMI constraints. IC Role / Device Role / Timing Role: True-differential ADC rejecting coupled RF noise while maintaining 70dB SINAD at 525kHz input frequency. Use Value: Avoids external baluns or transformer coupling, shrinking BOM and improving thermal stability in compact RF modules. |
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring high dynamic range and low standby current. IC Role / Device Role / Timing Role: 12-bit ADC operating from 5V supply with 1µA full power-down current and fast wake-up (<2ms) for button-triggered capture. Use Value: Extends single-charge runtime beyond 10 hours while preserving 12-bit resolution during active measurement bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, differential-input ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1Msps, SPI-only, internal reference, no VL pin - higher resolution but lower speed and fixed 3.3V I/O. | Better for precision DC measurements (e.g., weigh scales); unsuitable for 1.8Msps motor control loops or 1.8V logic interfacing. | Select MAX1275BETC+ when throughput >1.2Msps, bipolar input, or dual-supply flexibility is required. |
| AD7476AARMZ | 12-bit, 1Msps, unipolar only, no differential input, 2.7–5.25V single supply - lacks true-differential front-end and bipolar support. | Fits simple unipolar sensor interfaces (e.g., RTD bias circuits); cannot replace MAX1275BETC+ in AC-coupled or bidirectional current sensing. | Choose MAX1275BETC+ for any application requiring noise-immune bipolar signal acquisition at ≥1.5Msps. |
Compared with ADS8860IDRCT and AD7476AARMZ, the MAX1275BETC+ uniquely combines 1.8Msps throughput, true-differential bipolar input, 1.8V–5.25V logic compatibility, and 1µA power-down - making it the only viable option for space-constrained, battery-aware, high-bandwidth industrial control nodes.
Availability
MAX1275BETC+ is available at Aetrix Electronics and suitable for motor control, industrial data acquisition, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1275BETC+ 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 industrial, automotive, and communications infrastructure.
The MAX1274/MAX1275 family was engineered for high-speed, low-power, true-differential data acquisition in noise-sensitive environments - emphasizing DC accuracy, AC fidelity, and flexible digital interfacing without sacrificing energy efficiency.
FAQ
What is the input voltage range for MAX1275BETC+?
The MAX1275BETC+ features a true-differential bipolar input range of –VREF/2 to +VREF/2. With a standard 4.096V reference, this corresponds to ±2.048V differential swing. Absolute input voltage on AIN+ and AIN– must remain within 0V to VDD (4.75V–5.25V), and RGND must be connected to system ground for valid operation. The MAX1275BETC+ does not support unipolar input mode - that function is exclusive to the MAX1274 variant.
Does MAX1275BETC+ require an external reference voltage?
Yes, the MAX1275BETC+ requires an external reference voltage applied to the REF pin. The specified range is +1.0V to VDD + 50mV (i.e., up to +5.3V). For optimal performance, Maxim recommends bypassing REF with both a 4.7µF tantalum and a 0.01µF ceramic capacitor to RGND. The MAX1275BETC+ contains no internal reference; omitting the external reference will result in undefined conversion results.
How does the power-down mode work on MAX1275BETC+?
The MAX1275BETC+ supports two power-down states: partial (1mA typical VDD current) and full (1µA max VDD current). Entry requires specific CNVST/SCLK timing - partial mode is entered by pulling CNVST high after the 3rd but before the 14th SCLK rising edge; full mode requires executing the partial sequence twice. Exiting either mode requires driving CNVST low and waiting ≥14 SCLK cycles before reasserting CNVST high. The MAX1275BETC+ remains fully functional after wake-up with no recalibration needed.
Is MAX1275BETC+ compatible with standard SPI interfaces?
Yes, the MAX1275BETC+ is fully compatible with SPI, QSPI, and MICROWIRE protocols. It supports all four SPI modes (CPOL/CPHA combinations) and requires no mode configuration - conversion starts on CNVST falling edge, and data appears on DOUT synchronized to SCLK rising edges. The device outputs three leading zeros followed by 12 MSB-first data bits, making it interoperable with standard SPI master peripherals without custom framing logic.
What is the significance of the 'B' grade in MAX1275BETC+?
The 'B' in MAX1275BETC+ denotes the INL grade: ±1.75 LSB maximum (vs. ±1.0 LSB for 'A' grade). This specification applies across the full –40°C to +85°C temperature range and reflects tighter factory calibration of the internal DAC array. The 'B' grade is selected for applications where end-system linearity must meet stringent requirements - such as Class A energy meters or calibrated laboratory instruments - without requiring post-manufacture trimming.
MAX1275BETC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1.8M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.8V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-TQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1275BETC+ FAQ
1.How can I place an order for MAX1275BETC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1275BETC+ 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 MAX1275BETC+ reliable?
The price and inventory of MAX1275BETC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1275BETC+ is usually 5 days.
3.What payment methods are accepted for MAX1275BETC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1275BETC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1275BETC+?
MAX1275BETC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1275BETC+ 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 MAX1275BETC+?
For technical support, including MAX1275BETC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1275BETC+ requirements.
6.How does Aetrix verify that MAX1275BETC+ is sourced from the original manufacturer or authorized distributors?
All MAX1275BETC+ 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 MAX1275BETC+ meets industry standards.
7.What is the process for return or replacement of MAX1275BETC+?
All MAX1275BETC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1275BETC+, 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 MAX1275BETC+ part is unused and in its original packaging.
Return procedure for MAX1275BETC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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