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Analog Devices Inc./Maxim Integrated MAX1079ETC
- Part No.:
- MAX1079ETC
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1079ETC.pdf
- Description:
- MAX1079 10-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
MAX1079ETC from Maxim Integrated is a 10-bit, true-differential, serial-output analog-to-digital converter (ADC) with internal 2.048V reference, operating at up to 1.5Msps on a single +2.7V to +3.6V supply. It features bipolar analog input range (±VREF/2), 61dB SINAD at 525kHz, ±0.5 LSB INL, and supports SPI/QSPI/MICROWIRE interfaces. It is used in motor control systems requiring high-accuracy digitization of differential sensor signals under low-power constraints.
For engineers reviewing the MAX1079ETC datasheet, MAX1079ETC pinout, MAX1079ETC application, or MAX1079ETC equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support tailored for industrial embedded and base-station signal acquisition designs.
Technical Context
The MAX1079ETC employs a successive-approximation register (SAR) architecture with an integrated true-differential track-and-hold (T/H), enabling accurate sampling of bipolar input signals without external level-shifting. Its internal 2.048V reference remains active in normal and partial power-down modes but is disabled in full power-down mode, requiring ≥2ms recovery before valid conversion.
Conversion is initiated by a falling edge on CNVST and clocked by SCLK; 16 SCLK cycles are required per conversion, delivering 10 data bits, 2 sub-bits (S1/S0), and 3 leading zeros in MSB-first format. The device supports three power states: normal (7–9mA VDD current), partial power-down (2mA), and full power-down (≤1µA), with VL supply (1.8V to VDD) decoupled separately for logic-level compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 1.5Msps maximum throughput - enables digitization of signals up to 750kHz Nyquist bandwidth or undersampling of higher-frequency RF/IF content. |
| INL / DNL | ±0.5 LSB integral and differential nonlinearity - ensures <0.05% end-point linearity error critical for precision motor current sensing and closed-loop control. |
| SINAD | 61 dB at 525kHz input - corresponds to ~10.2 effective number of bits (ENOB), supporting high-fidelity acquisition in communications and instrumentation. |
| Input Range | Bipolar ±1.024V differential (VREF/2) - accepts centered AC-coupled signals or differential outputs from instrumentation amplifiers without DC biasing. |
| Power Modes | Full power-down draws ≤1µA - reduces system standby power in battery-operated portable instruments or intermittent-scan data loggers. |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperates with TI C54x DSPs and standard microcontrollers without protocol translation or glue logic. |
Pinout & Package
MAX1079ETC is housed in a 12-pin TQFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed paddle thermally and electrically connected to GND. The package supports reflow soldering (260°C) and is RoHS-compliant (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AIN− | Negative analog input | Completes true-differential pair with AIN+; accepts −1.024V to +1.024V relative to AIN+, enabling rejection of common-mode noise in noisy motor drive environments. |
| 2 REF | Internal reference output | 2.048V ±10mV (25°C), ±50ppm/°C drift; supplies DAC and can source 2mA for external circuitry-bypass with 0.01µF + 4.7µF to RGND. |
| 3 RGND | Reference ground | Dedicated low-noise ground return for REF and analog input stage; must be connected to system GND to avoid reference instability. |
| 4 VDD | Analog supply | +2.7V to +3.6V analog rail; bypass with 0.01µF + 10µF to GND to suppress switching noise from digital interface and maintain SNR performance. |
| 5, 11 N.C. | No connection | Unbonded pins-must remain unconnected and unpopulated on PCB; no routing or thermal relief required. |
| 6 GND | Ground | Main analog/digital ground; internally tied to exposed paddle (EP); serves as primary return path for VDD, VL, and digital I/O. |
| 7 VL | Digital I/O supply | +1.8V to VDD logic rail; allows direct interfacing with 1.8V/2.5V/3.3V controllers-bypass with 0.01µF + 10µF to GND. |
| 8 DOUT | Serial data output | 3-state CMOS output; drives MSB-first 10-bit result plus status bits on rising SCLK edges; valid tDOUT after each edge, held for tDHOLD. |
| 9 CNVST | Convert start input | Active-low asynchronous trigger; falling edge initiates T/H hold and conversion; timing-critical for jitter-sensitive applications. |
| 10 SCLK | Serial clock input | Master-controlled clock (up to 24MHz); defines conversion speed and bit-shift timing; idle high/low acceptable. |
| 12 AIN+ | Positive analog input | Completes true-differential pair with AIN−; sampled voltage difference (AIN+ − AIN−) determines output code per bipolar two's complement transfer function. |
| EP | Exposed paddle | Internally connected to GND; must be soldered to solid GND plane for thermal dissipation (1349mW max) and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential T/H input | Rejects >60dB common-mode noise and improves SFDR by >5dB vs. single-ended inputs-critical for current-sense amplifier outputs in inverter legs. |
| No pipeline delay | First valid conversion completes within 0.667µs after CNVST fall-enables deterministic latency for real-time feedback loops in servo motor control. |
| Separate VL supply | Enables direct interface to 1.8V FPGA I/O banks or ultra-low-voltage MCUs without level shifters-reduces BOM count and layout complexity. |
| Internal 2.048V reference | Eliminates external reference IC and associated passive components-saves board space and improves long-term gain stability (±2ppm/°C TC). |
| Partial/full power-down | Reduces average current from 8mA to 2mA (partial) or ≤1µA (full)-extends battery life in handheld test equipment between measurement bursts. |
Applications
| Motor Control | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Digitizing phase currents in 3-phase BLDC inverters using shunt resistors and differential amplifiers. IC Role / Device Role / Timing Role: Bipolar ADC capturing true-differential voltage across shunt with 1.5Msps rate and <5ns aperture jitter to resolve current ripple at PWM frequencies. Use Value: Enables precise field-oriented control (FOC) with <0.5% torque ripple due to ±0.5 LSB INL and 61dB SINAD preserving signal integrity. |
Use Scenario: High-channel-count condition monitoring of vibration, temperature, and pressure sensors in PLC-based factory automation. IC Role / Device Role / Timing Role: Low-power, serial-output ADC multiplexed across multiple sensor front-ends via shared SCLK/DOUT bus and individual CNVST lines. Use Value: Reduces system power by 75% vs. legacy 12-bit ADCs while maintaining 10-bit ENOB-extends uptime in fanless industrial enclosures. |
| Portable Test Instruments | Wireless Base Station Receivers |
|
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring wide dynamic range and fast wake-up from sleep. IC Role / Device Role / Timing Role: ADC entering full power-down between measurements (<1µA), then recovering reference in 2ms to capture transient events on demand. Use Value: Achieves >10-hour battery life with 100ksps burst sampling-enabled by VL-supply independence and zero pipeline delay. |
Use Scenario: Digitizing IF signals in LTE femtocell receivers where size, power, and spurious-free performance are constrained. IC Role / Device Role / Timing Role: ADC undersampling 190MHz IF with 1.5Msps clock, leveraging 15MHz small-signal bandwidth and −88.7dB SFDR at 500kHz. Use Value: Replaces larger, higher-power sigma-delta converters-reduces receiver front-end BOM cost by $1.20/unit and saves 12mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit differential SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8326IPW | 16-bit resolution, 500ksps, external reference required, 16-pin TSSOP | Higher precision but lower speed and no internal reference-requires additional ref IC and decoupling, increasing layout area and cost. | Select when absolute accuracy >12-bit ENOB is mandatory and throughput ≤500ksps suffices; not drop-in due to pin count, voltage levels, and interface timing. |
| AD7457BRMZ | 12-bit resolution, 1Msps, unipolar input only, internal 2.5V ref, 10-pin MSOP | Lacks true-differential input-requires external instrumentation amp for bipolar signals, adding noise, offset, and power. | Choose for cost-sensitive unipolar applications (e.g., DC voltage monitoring); unsuitable for motor current sensing without redesign. |
Compared with ADS8326IPW and AD7457BRMZ, the MAX1079ETC uniquely combines bipolar differential input, internal reference, 1.5Msps speed, and ultra-low full-power-down current in a compact 12-pin TQFN-making it optimal for space-constrained, battery-aware, and noise-immune industrial signal chains.
Availability
MAX1079ETC is available at Aetrix Electronics and suitable for motor control, industrial data acquisition, portable instrumentation, and wireless base station receiver designs requiring stable component supply, extended temperature operation (−40°C to +85°C), and RoHS-compliant packaging.
Supply support for MAX1079ETC 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, communications, and consumer applications.
The MAX1077/MAX1079 product line was designed for low-power, high-speed digitization in space- and energy-constrained systems-targeting motor control, portable test gear, and telecom infrastructure where differential signaling, internal reference integration, and fast wake-up are essential.
FAQ
What is the analog input voltage range for MAX1079ETC?
The MAX1079ETC features a true-differential bipolar input range of −VREF/2 to +VREF/2, where VREF = 2.048V. This yields a differential input span of ±1.024V (−1.024V to +1.024V), enabling direct digitization of AC-coupled or center-tapped sensor outputs without external level-shifting circuitry. Absolute pin voltage must remain within 0V to VDD.
Does MAX1079ETC require an external reference?
No, the MAX1079ETC includes a factory-trimmed 2.048V internal reference accessible at the REF pin. This reference drives the internal DAC and can source up to 2mA for external use. It remains enabled in normal and partial power-down modes but is disabled in full power-down mode, requiring ≥2ms settling time upon exit.
How many clock cycles are needed to read a full conversion from MAX1079ETC?
A complete conversion from the MAX1079ETC requires exactly 16 SCLK rising edges. The serial output contains three leading zeros, followed by 10 data bits (MSB first), two status sub-bits (S1/S0), and one trailing zero. DOUT transitions on each SCLK rising edge and remains valid for tDHOLD = 4ns after the next edge.
What is the power consumption of MAX1079ETC in full power-down mode?
In full power-down mode, the MAX1079ETC draws ≤1µA total supply current (VDD + VL combined) at +25°C. This ultra-low state disables the internal reference and analog circuitry entirely. Recovery to full operational readiness-including reference stabilization-requires ≥2ms after exiting full power-down, as specified in the datasheet.
Can MAX1079ETC interface directly with a 1.8V microcontroller?
Yes, the MAX1079ETC supports direct interfacing with 1.8V logic via its dedicated VL supply pin (Pin 7). When VL = 1.8V, digital inputs (CNVST, SCLK) accept 0.3×VL = 0.54V low and 0.7×VL = 1.26V high thresholds, and DOUT drives VOH ≥ VL − 0.5V = 1.3V-ensuring reliable communication without level shifters.
MAX1079ETC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1.5M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire Serial, DSP, Microwire, QSPI, 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-TQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1079ETC FAQ
1.How can I place an order for MAX1079ETC through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1079ETC 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 MAX1079ETC reliable?
The price and inventory of MAX1079ETC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1079ETC is usually 5 days.
3.What payment methods are accepted for MAX1079ETC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1079ETC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1079ETC?
MAX1079ETC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1079ETC 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 MAX1079ETC?
For technical support, including MAX1079ETC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1079ETC requirements.
6.How does Aetrix verify that MAX1079ETC is sourced from the original manufacturer or authorized distributors?
All MAX1079ETC 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 MAX1079ETC meets industry standards.
7.What is the process for return or replacement of MAX1079ETC?
All MAX1079ETC units undergo pre-shipment inspection (PSI). If there is an issue with MAX1079ETC, 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 MAX1079ETC part is unused and in its original packaging.
Return procedure for MAX1079ETC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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