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Analog Devices Inc./Maxim Integrated MAX1276ETC+
- Part No.:
- MAX1276ETC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1276ETC+.pdf
- Description:
- IC ADC 12BIT SAR 12TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX1276ETC+ from Maxim Integrated is a 12-bit, true-differential, serial-output analog-to-digital converter (ADC) with internal 4.096V reference, 1.8Msps sampling rate, ±1.25 LSB INL, and unipolar input range (0 to VREF). It operates from a single +4.75V to +5.25V analog supply and supports 1.8V–VDD digital logic via dedicated VL pin, enabling direct interfacing with low-voltage microcontrollers in motor control and industrial data acquisition systems.
For engineers reviewing the MAX1276ETC+ datasheet, MAX1276ETC+ pinout, MAX1276ETC+ application, or MAX1276ETC+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Maxim's official specifications for the MAX1276ETC+ variant (12-pin TQFN, -40°C to +85°C, unipolar input).
Technical Context
The MAX1276ETC+ employs a successive-approximation register (SAR) architecture with an integrated true-differential track-and-hold (T/H), delivering no pipeline delay and 70dB SINAD at 525kHz input frequency. Its internal 4.096V reference remains active in normal and partial power-down modes, supporting fast wake-up (16-cycle restart) and stable conversion accuracy across temperature.
It uses a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface (SCLK, CNVST, DOUT), requiring exactly 16 SCLK cycles per conversion. The CNVST falling edge initiates sampling, and DOUT outputs MSB-first with three leading zeros - enabling seamless integration with TI C54x DSPs and standard microcontroller synchronous serial ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 1.8Msps maximum throughput - supports real-time digitization of signals up to 20MHz small-signal bandwidth using undersampling techniques. |
| DC Accuracy | ±1.25 LSB integral nonlinearity (INL) - ensures high-fidelity representation of analog signals without gain/offset calibration in most industrial applications. |
| Analog Input | True-differential unipolar input (AIN+ to AIN− = 0V to +4.096V) - provides superior noise immunity and 2× dynamic range vs. single-ended configurations. |
| Power Modes | Full power-down draws ≤1µA; partial power-down draws 2mA - enables energy-efficient operation between conversions in battery-powered or intermittent-sampling systems. |
| Digital Interface | SPI/QSPI/MICROWIRE 3-wire serial (SCLK/CNVST/DOUT) - eliminates need for parallel bus, reduces PCB routing complexity, and supports daisy-chaining. |
| Reference | Internal 4.096V ±10mV (±50ppm/°C) - eliminates external reference component, simplifies BOM, and supplies up to 2mA for auxiliary circuitry. |
Pinout & Package
MAX1276ETC+ is housed in a 12-pin 3mm × 3mm thin quad flat no-lead (TQFN) package with exposed paddle (EP), rated for -40°C to +85°C operation. The EP is internally connected to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AIN− | Negative analog input | Completes true-differential input pair with AIN+; must be referenced to RGND for optimal common-mode rejection. |
| 2 REF | Internal reference output | Provides 4.096V reference voltage; requires 0.01µF + 4.7µF bypass to RGND for stability and low-noise operation. |
| 3 RGND | Reference ground | Separate ground return for REF and analog input stage; must be connected directly to system GND to minimize reference error. |
| 4 VDD | Analog supply input | +4.75V to +5.25V analog rail; bypassed with 0.01µF + 10µF capacitors to GND to suppress high-frequency noise affecting conversion accuracy. |
| 5, 11 N.C. | No connection | Unbonded pins; must remain floating - no routing or soldering permitted. |
| 6 GND | Digital/analog ground | Main system ground; internally tied to exposed paddle (EP); serves as return path for VDD, VL, and digital I/O. |
| 7 VL | Digital logic supply | +1.8V to VDD logic rail; enables direct interface with 1.8V/2.5V/3.3V/5V controllers without level shifters. |
| 8 DOUT | Serial data output | MSB-first 12-bit result with three leading zeros; transitions on SCLK rising edge; tri-states when CNVST goes high. |
| 9 CNVST | Convert start control | Falling edge triggers T/H hold and conversion start; timing window determines entry into partial/full power-down modes. |
| 10 SCLK | Serial clock input | Drives conversion timing and data shift-out; supports up to 28.8MHz; idle state (high/low) configurable per host interface. |
| 12 AIN+ | Positive analog input | Primary differential input node; full-scale range is 0V to VREF (unipolar) - matches MAX1276's transfer function. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential T/H input | Enables 70dB SINAD at 525kHz and rejects common-mode noise without external instrumentation amplifiers. |
| No pipeline delay | Delivers deterministic latency (≤0.556µs conversion time) - critical for closed-loop motor control and real-time feedback systems. |
| Separate VL supply | Allows independent 1.8V digital interface while maintaining 5V analog performance - eliminates level-shifter components and associated signal integrity issues. |
| Internal 4.096V reference | Reduces BOM count by one precision reference IC; ±50ppm/°C drift ensures <0.1% full-scale error over industrial temperature range. |
| Partial & full power-down | 2mA (partial) and ≤1µA (full) quiescent current - extends battery life in portable instruments and enables duty-cycled sensing architectures. |
Applications
| Motor Control Feedback | Industrial Data Acquisition |
|---|---|
Use Scenario: Sampling current/voltage waveforms in servo drives and inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-speed, low-latency ADC capturing phase currents with true-differential inputs to reject PWM switching noise. Use Value: 1.8Msps rate and 20MHz input bandwidth support accurate reconstruction of 10kHz+ fundamental frequencies; ±1.25 LSB INL ensures precise torque calculation. |
Use Scenario: Multi-channel sensor monitoring in PLC analog input modules and process transmitters. IC Role / Device Role / Timing Role: Precision front-end ADC converting 4–20mA loop signals or thermocouple outputs with integrated reference stability. Use Value: Internal 4.096V reference eliminates external trimming; unipolar 0–4.096V range maps directly to 12-bit resolution for 0.001V LSB granularity. |
| Portable Test Equipment | Communications Baseband |
Use Scenario: Handheld oscilloscopes and multimeters requiring compact, low-power, high-accuracy digitization. IC Role / Device Role / Timing Role: Core ADC in battery-operated instruments where size, power, and DC accuracy are prioritized over ultra-high speed. Use Value: 12-pin TQFN footprint saves board space; 55mW typical power dissipation extends runtime; 2ms reference settle time enables rapid measurement startup. |
Use Scenario: Digitizing IF/RF baseband signals in wireless infrastructure equipment (e.g., LTE remote radio heads). IC Role / Device Role / Timing Role: Medium-speed ADC for channel monitoring, automatic gain control (AGC), and digital predistortion (DPD) feedback paths. Use Value: 70dB SINAD at 525kHz supports >10-bit ENOB for wideband signal analysis; differential input rejects coupled RF 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 |
|---|---|---|---|
| ADS8325IPW | 16-bit resolution, 100ksps max, external reference required, 20-pin TSSOP | Better DC accuracy but lower speed; suited for precision DC measurements, not high-throughput AC capture | Select when 16-bit resolution and <±0.5 LSB INL outweigh speed and integration needs. |
| AD7476AARMZ | 12-bit, 1Msps, no internal reference, 8-pin MSOP, 2.35–5.25V single supply | Lower power (3.7mW @ 1Msps) but lacks differential input and internal reference - requires external components | Select for ultra-low-power, cost-sensitive designs where external reference and signal conditioning are acceptable. |
Compared with ADS8325IPW and AD7476AARMZ, the MAX1276ETC+ uniquely combines 1.8Msps speed, true-differential input, internal 4.096V reference, and 12-pin TQFN packaging - making it optimal for space-constrained, noise-immune, medium-speed industrial digitization where system-level integration reduces design risk.
Availability
MAX1276ETC+ is available at Aetrix Electronics and suitable for motor control feedback, industrial data acquisition, and portable test equipment requiring stable component supply, RoHS-compliant packaging, and extended temperature support (-40°C to +85°C).
Supply support for MAX1276ETC+ 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, automotive, and communications markets.
The MAX1276ETC+ belongs to Maxim's precision data acquisition product line, designed specifically for applications demanding high-speed, low-power, and integrated signal chain solutions - especially where differential input, internal reference, and minimal external components are critical.
FAQ
What is the input voltage range for MAX1276ETC+?
The MAX1276ETC+ features a unipolar true-differential analog input with a full-scale range of AIN+ − AIN− = 0V to +4.096V (VREF). Absolute input voltage on each pin must stay within 0V to VDD, and RGND must be connected to system GND. This range is fixed by the internal 4.096V reference and applies specifically to the MAX1276ETC+ variant - unlike the bipolar MAX1278ETC+.
Does MAX1276ETC+ require an external reference?
No, the MAX1276ETC+ includes a factory-trimmed 4.096V internal reference accessible at the REF pin. It sources up to 2mA and remains enabled in normal and partial power-down modes. External reference is unnecessary unless higher initial accuracy or different voltage is required - in which case the internal reference must be disabled per datasheet instructions.
How does the power-down mode work on MAX1276ETC+?
The MAX1276ETC+ supports two low-power states: partial power-down (2mA IDD) entered by asserting CNVST high after the 3rd but before the 14th SCLK rising edge, and full power-down (≤1µA IDD) entered by repeating that sequence. In full power-down, the internal reference is disabled and requires ≥2ms to re-stabilize after exit - a timing constraint critical for time-sensitive applications using the MAX1276ETC+.
What digital interfaces are compatible with MAX1276ETC+?
The MAX1276ETC+ supports SPI, QSPI, and MICROWIRE protocols via its 3-wire serial interface (SCLK, CNVST, DOUT). It operates in all four SPI modes (CPOL/CPHA combinations) and requires 16 SCLK cycles per 12-bit conversion. No configuration registers or setup commands are needed - interface behavior is hardwired, simplifying firmware development for microcontrollers and DSPs interfacing with the MAX1276ETC+.
What is the significance of the RGND pin on MAX1276ETC+?
RGND is the dedicated reference ground for the internal 4.096V reference and analog input stage of the MAX1276ETC+. It must be connected directly to system GND with low-inductance routing - separate from noisy digital ground planes - to prevent reference voltage errors and maintain ±1.25 LSB INL accuracy. Failure to properly tie RGND degrades DC performance and invalidates the MAX1276ETC+'s specified integral nonlinearity.
MAX1276ETC+ 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:
- Internal
- 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:
- -
MAX1276ETC+ FAQ
1.How can I place an order for MAX1276ETC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1276ETC+ 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 MAX1276ETC+ reliable?
The price and inventory of MAX1276ETC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1276ETC+ is usually 5 days.
3.What payment methods are accepted for MAX1276ETC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1276ETC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1276ETC+?
MAX1276ETC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1276ETC+ 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 MAX1276ETC+?
For technical support, including MAX1276ETC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1276ETC+ requirements.
6.How does Aetrix verify that MAX1276ETC+ is sourced from the original manufacturer or authorized distributors?
All MAX1276ETC+ 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 MAX1276ETC+ meets industry standards.
7.What is the process for return or replacement of MAX1276ETC+?
All MAX1276ETC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1276ETC+, 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 MAX1276ETC+ part is unused and in its original packaging.
Return procedure for MAX1276ETC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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