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Analog Devices Inc./Maxim Integrated MAX1275ACTC+
- Part No.:
- MAX1275ACTC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1275ACTC+.pdf
- Description:
- IC ADC 12BIT SAR 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,234
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Product details
Overview
MAX1275ACTC+ from Maxim Integrated is a 12-bit, true-differential, single-supply analog-to-digital converter (ADC) with 1.8Msps throughput, ±1 LSB INL accuracy, and bipolar input range (–VREF/2 to +VREF/2). It operates from +4.75V to +5.25V analog supply and supports 1.8V–VDD digital logic via separate VL pin, enabling direct interfacing with low-voltage DSPs and microcontrollers in motor control and industrial data acquisition systems.
For engineers reviewing the MAX1275ACTC+ datasheet, MAX1275ACTC+ pinout, MAX1275ACTC+ application, or MAX1275ACTC+ equivalent, this page delivers verified specifications, validated pin functions, confirmed bipolar-input timing behavior, and real-world interface guidance for SPI/QSPI/MICROWIRE synchronous serial systems requiring high dynamic range and low power between conversions.
Technical Context
The MAX1275ACTC+ employs a successive-approximation register (SAR) architecture with an internal true-differential track-and-hold (T/H), supporting undersampling up to 20MHz small-signal bandwidth. Its conversion is initiated by CNVST falling edge and clocked by SCLK, requiring exactly 16 SCLK cycles per 12-bit result plus three leading zeros - no pipeline delay.
It features two power-down modes: partial (1mA IDD typ) entered after the 3rd SCLK rising edge, and full (1µA IDD max) entered via repeated partial sequence. The bipolar transfer function outputs two's complement code, distinct from the unipolar MAX1274's straight-binary output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes over temperature |
| Sampling Rate | 1.8Msps maximum throughput; minimum conversion time = 0.556µs (16 × 28.8MHz SCLK period) |
| Differential Input Range | ±VREF/2 (bipolar); supports external reference from 1.0V to VDD + 50mV |
| DC Accuracy | ±1 LSB integral nonlinearity (INL) for MAX1275A grade; ±6 LSB offset error |
| Dynamic Performance | 70dB SINAD at 525kHz input; –83dB SFDR; 20MHz full-power bandwidth |
| Power Consumption | 9–11mA IDD (normal mode, 1.8Msps); 1µA IDD (full power-down, max) |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial (SCLK, CNVST, DOUT); MSB-first, 16-cycle frame |
Pinout & Package
MAX1275ACTC+ is housed in a 12-pin, 3mm × 3mm TQFN package with exposed paddle (EP) internally connected to GND. Pin 1 is AIN–; pin 12 is AIN+; pins 5 and 11 are no-connect; EP must be soldered to PCB ground plane for thermal and electrical performance.
| 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 |
| 2 (REF) | External reference voltage input | Sets full-scale range; requires 0.01µF + 4.7µF bypass to RGND; 1.0V to VDD + 50mV range |
| 3 (RGND) | Reference ground | Must be connected to system GND; separates analog reference return from power ground |
| 4 (VDD) | Analog supply voltage | +4.75V to +5.25V; bypass with 0.01µF + 10µF capacitors to GND |
| 6 (GND) | Power ground | Internally tied to exposed paddle (EP); primary return for VDD and VL supplies |
| 7 (VL) | Digital logic supply | +1.8V to VDD; enables direct interfacing with 1.8V/2.5V/3.3V/5V controllers; bypass with 0.01µF + 10µF |
| 8 (DOUT) | Serial data output | Three-state CMOS output; data valid tDOUT after SCLK rising edge; remains valid tDHOLD thereafter |
| 9 (CNVST) | Convert start input | Falling edge initiates conversion and T/H hold; rising edge controls power-down entry/exit timing windows |
| 10 (SCLK) | Serial clock input | Drives conversion and data shift-out; 28.8MHz max frequency; idle high/low supported |
| 12 (AIN+) | Positive analog input | Completes true-differential pair with AIN–; common-mode range 0V to VDD |
Key Features
| Feature | Design Value |
|---|---|
| True-differential input architecture | Enables 70dB SINAD and improved noise immunity vs. single-ended inputs; rejects common-mode interference |
| No pipeline delay | Provides deterministic latency of exactly one conversion cycle (0.556µs at 1.8Msps), critical for closed-loop control |
| Separate VL supply rail | Allows independent 1.8V–5.25V digital I/O voltage, eliminating level-shifters when interfacing with low-voltage DSPs |
| Two-stage power-down | Partial (1mA) and full (1µA) modes reduce quiescent current between samples without sacrificing wake-up speed |
| Bipolar two's complement output | Direct representation of signed differential input voltage; simplifies software scaling in motor phase current sensing |
Applications
| Motor Phase Current Sensing | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Real-time measurement of bidirectional current in BLDC motor windings using shunt resistors and differential amplifiers. IC Role / Device Role / Timing Role: Bipolar ADC digitizing ±VREF/2 differential voltage; synchronized to PWM switching via CNVST edge-triggering. Use Value: 12-bit resolution and ±1 LSB INL enable <1% current measurement error; 1.8Msps sampling captures transient ripple during commutation. |
Use Scenario: High-fidelity signal capture in programmable logic controller (PLC) analog input modules handling 4–20mA and ±10V sensor signals. IC Role / Device Role / Timing Role: Precision front-end ADC with external reference flexibility and robust noise immunity in electrically noisy factory environments. Use Value: True-differential inputs reject common-mode noise from long sensor cables; 70dB SINAD ensures accurate representation of low-level thermocouple or strain gauge outputs. |
| Base Station Receiver IF Sampling | Portable Test Equipment |
|
Use Scenario: Digitizing intermediate-frequency (IF) signals (e.g., 525kHz) in cellular base station receiver chains for digital demodulation. IC Role / Device Role / Timing Role: High-SFDR ADC operating in undersampling mode; clocked by stable local oscillator-derived SCLK. Use Value: –83dB SFDR and 20MHz bandwidth support clean capture of narrowband IF signals without aliasing; external REF allows calibration traceability. |
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring precision, low power, and compact form factor. IC Role / Device Role / Timing Role: Core ADC in portable instrument front-end; leverages full power-down mode (<1µA) during display/idle periods. Use Value: 1µA shutdown current extends battery life; 12-pin TQFN (3mm × 3mm) minimizes PCB area; single 5V supply simplifies power design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, high-speed, differential ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI-only, no VL pin, internal reference option | Higher resolution but lower speed; lacks bipolar input flexibility and separate logic supply | Prefer when DC precision > speed; avoid if interfacing with 1.8V logic or requiring true bipolar range |
| AD7403BRIZ-RL | 16-bit isolated sigma-delta modulator, 20MHz clock input, differential CMOS output | Requires external digital filter; provides galvanic isolation; not pin-compatible or functionally drop-in | Choose only when reinforced isolation is mandatory; not suitable for direct replacement in existing MAX1275ACTC+ layouts |
Compared with ADS8860IDRCT and AD7403BRIZ-RL, the MAX1275ACTC+ uniquely balances 1.8Msps speed, true bipolar differential input, 1.8V–5.25V logic compatibility, and sub-µA shutdown - making it optimal for space-constrained, mixed-voltage industrial control nodes where latency and power cycling matter.
Availability
MAX1275ACTC+ is available at Aetrix Electronics and suitable for motor control, industrial data acquisition, and portable instrumentation requiring stable component supply, extended temperature operation (–40°C to +85°C), and RoHS-compliant packaging.
Supply support for MAX1275ACTC+ 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, communications, and computing applications.
The MAX1274/MAX1275 family was engineered for high-speed, low-power, true-differential data acquisition in noise-sensitive environments - emphasizing AC performance, flexible digital interfacing, and seamless integration with DSP/microcontroller serial ports.
FAQ
What is the input voltage range for MAX1275ACTC+?
The MAX1275ACTC+ supports a true-differential bipolar input range of –VREF/2 to +VREF/2, where VREF is externally supplied (1.0V to VDD + 50mV). For example, with a 4.096V reference, the differential input spans –2.048V to +2.048V. Absolute pin voltage must remain within 0V to VDD, and RGND must be tied to system ground.
Does MAX1275ACTC+ require an external reference?
Yes, MAX1275ACTC+ requires an external reference voltage applied to the REF pin. The device does not include an internal reference. Optimal performance demands 0.01µF and 4.7µF bypass capacitors from REF to RGND, and VREF must be stable within ±0.5% for full 12-bit accuracy.
How do I enter full power-down mode on MAX1275ACTC+?
To enter full power-down mode on MAX1275ACTC+, first place the device in partial power-down by pulling CNVST high after the 3rd SCLK rising edge and before the 14th. Then repeat that exact same SCLK/CNVST sequence - i.e., drive CNVST low, wait ≥14 SCLK cycles, then pull CNVST high again. This second sequence triggers full power-down (1µA max IDD).
Is MAX1275ACTC+ compatible with standard SPI interfaces?
Yes, MAX1275ACTC+ is fully compatible with SPI, QSPI, and MICROWIRE protocols. It supports all four SPI modes (CPOL/CPHA combinations), uses a 3-wire interface (SCLK, CNVST, DOUT), and outputs 12 data bits preceded by three zeros in MSB-first format over 16 SCLK cycles - no additional framing or chip-select required.
What is the purpose of the RGND pin on MAX1275ACTC+?
The RGND pin on MAX1275ACTC+ is the dedicated reference ground for the external reference voltage (REF) and analog input circuitry. It must be connected directly to system ground but kept as a separate low-noise return path from power ground (GND) to preserve DC accuracy and minimize reference coupling errors - especially critical for achieving ±1 LSB INL.
MAX1275ACTC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-TQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1275ACTC+ FAQ
1.How can I place an order for MAX1275ACTC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1275ACTC+ 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 MAX1275ACTC+ reliable?
The price and inventory of MAX1275ACTC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1275ACTC+ is usually 5 days.
3.What payment methods are accepted for MAX1275ACTC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1275ACTC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1275ACTC+?
MAX1275ACTC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1275ACTC+ 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 MAX1275ACTC+?
For technical support, including MAX1275ACTC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1275ACTC+ requirements.
6.How does Aetrix verify that MAX1275ACTC+ is sourced from the original manufacturer or authorized distributors?
All MAX1275ACTC+ 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 MAX1275ACTC+ meets industry standards.
7.What is the process for return or replacement of MAX1275ACTC+?
All MAX1275ACTC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1275ACTC+, 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 MAX1275ACTC+ part is unused and in its original packaging.
Return procedure for MAX1275ACTC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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