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Analog Devices Inc./Maxim Integrated MAX1377ATP+
- Part No.:
- MAX1377ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX1377ATP+.pdf
- Description:
- IC ADC 12BIT SAR 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
MAX1377ATP+ from Maxim Integrated is a dual, simultaneous-sampling, 12-bit SAR ADC with SPI/QSPI/MICROWIRE/DSP-compatible serial interface and internal 2.048V reference. It operates from a 2.7V–3.6V analog supply and 1.8V–AVDD digital supply, delivers 1.25Msps per channel, achieves 70dB SINAD and 84dBc SFDR at 500kHz input, and targets high-precision industrial process control and motor-control data acquisition systems requiring synchronized dual-channel sampling.
For engineers reviewing the MAX1377ATP+ datasheet, MAX1377ATP+ pinout, MAX1377ATP+ application, or MAX1377ATP+ equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, and validated alternative options for dual-channel 12-bit simultaneous-sampling ADC selection in automotive-grade (-40°C to +125°C) embedded systems.
Technical Context
The MAX1377ATP+ implements two independent 12-bit successive approximation register (SAR) ADCs with true simultaneous sampling-critical for phase-coherent measurements in motor current sensing and power quality monitoring. Its dual-output serial interface transfers full 12-bit results from both channels concurrently at up to 1.25Msps, doubling effective throughput versus single-output mode.
It supports unipolar (0–VREF) or bipolar (±VREF/2) input ranges via U/B control, accepts differential or two single-ended inputs per channel, and features internal reference (2.048V ±10mV) with ±50ppm/°C tempco or external reference selection via REFSEL. Power management includes partial (2mA) and full (1µA) power-down modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture enabling precise amplitude quantization for industrial sensor interfaces. |
| Sampling Rate | 1.25Msps per channel with simultaneous capture-supports real-time control loop sampling at ≤500kHz Nyquist bandwidth. |
| SINAD | 70dB at fIN = 500kHz-ensures ≥11.3 effective bits for high-fidelity signal reconstruction in RF and motor feedback paths. |
| Full-Linear Bandwidth | 1MHz (S/N+D > 68dB)-validates accurate digitization of fast transients in motor phase current waveforms. |
| Analog Supply | 2.7V–3.6V AVDD-enables direct integration into low-voltage industrial PLC I/O modules without level-shifting. |
| Digital Supply | 1.8V–AVDD VL-allows seamless interfacing with 1.8V/2.5V/3.3V microcontrollers and DSPs without translators. |
| Operating Temp | -40°C to +125°C-qualified for under-hood automotive motor control and industrial drive environments. |
Pinout & Package
MAX1377ATP+ is housed in a 20-pin TQFN-EP (4mm × 4mm, 0.5mm pitch) with exposed pad for thermal dissipation. Pin numbering follows standard top-view orientation with Pin 1 marked by dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFSEL | Reference select input | Logic-level control to enable internal reference (low) or external reference (high); determines VREF source and power state of reference circuitry. |
| 2 REF | Reference output/input | Provides 2.048V internal reference (bypassed to RGND) or accepts external reference voltage (1.0V–AVDD+0.05V). |
| 3 RGND | Reference ground | Common negative reference point for bipolar mode; serves as shared analog return for all four inputs in unipolar mode. |
| 4, 18 AGND | Analog ground | Dedicated low-noise ground return for analog circuitry; must be separated from DGND and connected at single point. |
| 5 AVDD | Analog supply | 2.7V–3.6V power for ADC core, track-and-hold, and reference; requires 10µF || 10nF local bypass to AGND. |
| 6 AIN2A | Channel 2 positive input | Primary analog input for ADC2; supports true-differential (with AIN2B) or single-ended configuration relative to RGND. |
| 7 AIN2B | Channel 2 negative input | Secondary analog input for ADC2; enables differential measurement or second single-ended channel when U/B = 1. |
| 8 AIN1A | Channel 1 positive input | Primary analog input for ADC1; functionally identical to AIN2A with matched timing and accuracy specs. |
| 9 AIN1B | Channel 1 negative input | Secondary analog input for ADC1; ensures simultaneous sampling alignment with AIN2B for phase-critical applications. |
| 10 CNVST | Convert start input | Edge-triggered command initiating simultaneous sampling on both ADCs; defines aperture timing for coherent acquisition. |
| 11 SCLK | Serial clock input | 20MHz max SPI-compatible clock driving data transfer; controls timing of DOUT1/DOUT2 output validity and bit alignment. |
| 12 CS | Chip select input | Active-low enable for serial interface; allows multiple devices on shared bus and reduces standby current when deasserted. |
| 13 DOUT1 | Channel 1 serial output | 12-bit MSB-first data stream for ADC1; operates independently in dual-output mode or multiplexed in single-output mode. |
| 14 DOUT2 | Channel 2 serial output | 12-bit MSB-first data stream for ADC2; enables parallel readout without inter-channel latency skew. |
| 15 U/B | Unipolar/bipolar select | Configures input range: low = unipolar (0–VREF), high = bipolar (±VREF/2); sets RGND role and full-scale scaling. |
| 16 S/D | Single/dual output select | Selects interface mode: low = dual outputs (1.25Msps), high = single output (0.625Msps); affects timing and pin usage. |
| 17 SEL | Input mux select | Chooses between 2×2 mux (AIN1A/AIN1B/AIN2A/AIN2B) or two differential pairs; defines analog input topology. |
| 19 DGND | Digital ground | Return path for digital I/O and logic; must be isolated from AGND except at single-point star connection. |
| 20 VL | Digital supply | 1.8V–AVDD logic supply; powers serial interface and control logic; decoupling required for noise-sensitive timing. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Guarantees zero inter-channel phase delay-essential for vector-controlled motor drives and three-phase current measurement. |
| Internal 2.048V reference | ±10mV initial accuracy and ±50ppm/°C drift enable stable absolute measurements without external precision reference ICs. |
| 20MHz SPI-compatible interface | Supports high-speed data streaming to Cortex-M4/M7 or C2000 DSPs with minimal firmware overhead and deterministic timing. |
| Partial power-down (2mA) | Maintains reference and bias circuits active for sub-µs wake-up-ideal for burst-mode acquisition in battery-powered test equipment. |
| Automotive temperature grade | -40°C to +125°C operation with guaranteed AC/DC specs across range-meets AEC-Q100 stress requirements for motor control ECUs. |
Applications
| Motor Current Sensing | Industrial Process Control |
|---|---|
|
Use Scenario: Real-time sampling of phase currents in three-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC captures Ia and Ib at precisely aligned apertures to reconstruct Ic via Kirchhoff's law with <2ns matching error. Use Value: Enables torque ripple reduction and efficient PWM switching by eliminating sampling skew-induced current estimation errors. |
Use Scenario: High-accuracy analog input module in programmable logic controllers (PLCs) for pressure, temperature, and flow sensors. IC Role / Device Role / Timing Role: Provides synchronized dual-channel acquisition for redundant sensor validation and differential sensor configurations. Use Value: Improves system reliability through cross-checked measurements and supports 4–20mA loop diagnostics with 12-bit resolution. |
| RF Signal Monitoring | Automotive Battery Management |
|
Use Scenario: Digitizing IF signals in software-defined radio (SDR) front-ends or spectrum analyzers operating up to 500kHz baseband. IC Role / Device Role / Timing Role: Simultaneous dual-channel capture preserves phase relationship between I/Q components for coherent demodulation. Use Value: Achieves 70dB SINAD at 500kHz input-sufficient for 16-QAM demodulation without additional analog filtering. |
Use Scenario: Cell voltage and temperature monitoring in high-voltage EV battery packs with isolation barriers. IC Role / Device Role / Timing Role: Interfaces with isolated sigma-delta modulators or directly samples shunt-based current sense signals with synchronized timing. Use Value: Supports ISO 26262 ASIL-B functional safety by enabling time-aligned voltage/current sampling for SOC/SOH calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel 12-bit simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8556IPM | 6-channel, 16-bit SAR with 1.25Msps/ch, 5V analog supply, no integrated reference, larger 64-pin HTQFP package. | Higher resolution for precision test equipment; lacks internal reference and automotive temp grade. | Choose when 16-bit resolution and multi-channel count outweigh size, cost, and reference integration needs. |
| AD7327BRUZ | 8-channel, 12-bit SAR with 1Msps/ch, ±10V input range, 3V/5V dual supply, internal reference, 24-pin TSSOP. | Wider input range suits industrial ±10V sensor interfaces; lower throughput and non-automotive temp grade (-40°C to +85°C). | Prefer for legacy ±10V instrumentation systems where channel count >2 and extended voltage range are mandatory. |
Compared with ADS8556IPM and AD7327BRUZ, the MAX1377ATP+ offers the optimal balance of automotive-grade reliability, integrated reference, compact TQFN packaging, and true simultaneous dual-channel performance at 12-bit resolution-making it uniquely suited for space-constrained motor control and industrial automation designs.
Availability
MAX1377ATP+ is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and high-precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1377ATP+ 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 MAX1377ATP+ belongs to Maxim's precision data acquisition product line, engineered specifically for applications demanding synchronized dual-channel sampling, low-power operation, and robust performance in harsh environments.
FAQ
What is the maximum sampling rate supported by the MAX1377ATP+?
The MAX1377ATP+ supports a maximum throughput rate of 1.25Msps per channel in dual-output mode (S/D = 0). This rate is achieved using a 20MHz SCLK and 16-clock-cycle conversion time. In single-output mode (S/D = 1), the maximum rate drops to 0.625Msps due to time-multiplexed data transfer. The device maintains full linear bandwidth (1MHz) only above 10ksps sample rates.
Does the MAX1377ATP+ include an internal voltage reference?
Yes, the MAX1377ATP+ integrates a precision 2.048V internal reference with ±10mV initial accuracy and ±50ppm/°C temperature coefficient. When REFSEL is driven low, the internal reference is enabled and appears at the REF pin, requiring a ≥1µF capacitor to RGND. This eliminates the need for external reference ICs in most industrial and automotive applications.
What input configurations does the MAX1377ATP+ support?
The MAX1377ATP+ supports both true-differential and single-ended input modes per channel. Using the U/B pin, users select unipolar (0–VREF) or bipolar (±VREF/2) full-scale ranges. The SEL pin configures either a 2×2 analog mux (four independent inputs) or two differential pairs (AIN1A/AIN1B and AIN2A/AIN2B), enabling flexible sensor interface topologies.
How does the MAX1377ATP+ handle power management?
The MAX1377ATP+ provides two power-down modes: partial power-down (2mA supply current) retains reference and bias circuits for fast wake-up (<2ms), while full power-down reduces current to 1µA. These modes are controlled via dedicated logic inputs and are fully specified across the -40°C to +125°C range, supporting energy-efficient operation in battery-backed or intermittent-acquisition systems.
Is the MAX1377ATP+ qualified for automotive applications?
Yes, the MAX1377ATP+ is specified for the automotive temperature range of -40°C to +125°C and packaged in a 20-pin TQFN-EP with exposed pad for thermal performance. Its electrical specifications-including DC accuracy, dynamic performance, and power consumption-are guaranteed across this full range, making it suitable for engine control units, electric power steering, and battery management systems.
MAX1377ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1.25M
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1377ATP+ FAQ
1.How can I place an order for MAX1377ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1377ATP+ 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 MAX1377ATP+ reliable?
The price and inventory of MAX1377ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1377ATP+ is usually 5 days.
3.What payment methods are accepted for MAX1377ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1377ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1377ATP+?
MAX1377ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1377ATP+ 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 MAX1377ATP+?
For technical support, including MAX1377ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1377ATP+ requirements.
6.How does Aetrix verify that MAX1377ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX1377ATP+ 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 MAX1377ATP+ meets industry standards.
7.What is the process for return or replacement of MAX1377ATP+?
All MAX1377ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1377ATP+, 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 MAX1377ATP+ part is unused and in its original packaging.
Return procedure for MAX1377ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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