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Analog Devices Inc./Maxim Integrated MAX1322ECM
- Part No.:
- MAX1322ECM
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
MAX1322ECM.pdf
- Description:
- 8-CHANNEL, 14-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:4,292
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Product details
Overview
The MAX1322ECM from Maxim Integrated is a 2-channel, 14-bit simultaneous-sampling analog-to-digital converter (ADC) with ±5V input range and ±16.5V fault-tolerant inputs. It achieves 2.5µs conversion time for two channels and delivers 250ksps throughput per channel at full 8-channel operation. Its on-chip track/hold circuitry preserves inter-channel phase integrity, making it suitable for precision motor current sensing in multiphase inverters.
For engineers reviewing the MAX1322ECM datasheet, MAX1322ECM pinout, MAX1322ECM application, or MAX1322ECM equivalent, key selection criteria include bipolar ±5V input compatibility, 50ps channel-to-channel T/H matching, 90dBc SFDR at 100kHz, internal +2.5V reference option, and 48-pin LQFP packaging with industrial -40°C to +85°C operation.
Technical Context
This ADC employs independent track-and-hold amplifiers per channel to enable true simultaneous sampling-critical for vector control of three-phase motors where phase alignment between current and voltage measurements must be preserved within 50ps. The device uses a successive-approximation register (SAR) architecture with internal reference buffering and supports both internal (10MHz) and external clocking up to 12.5MHz.
Its parallel 14-bit interface operates at 16.6MHz with standard microcontroller-compatible timing (RD/WR/CS), while power management includes shutdown mode drawing ≤2µA digital supply current. Analog and digital supplies are fully decoupled (AVDD: +4.75V to +5.25V; DVDD: +2.7V to +5.25V), supporting mixed-signal system partitioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high dynamic range in power monitoring applications |
| Input Range | ±5V - enables direct connection to industrial current-sense amplifier outputs without level-shifting |
| Conversion Time (2 ch) | 2.5µs - allows sub-microsecond current sampling across two motor phases per PWM cycle |
| Throughput (8 ch) | 250ksps per channel - supports 125kHz fundamental sampling for 50/60Hz grid synchronization |
| SFDR @ 100kHz | 90dBc - ensures clean spectral representation for vibration analysis and harmonic distortion measurement |
| Channel Matching | 50ps T/H aperture delay mismatch - maintains <0.003° phase error at 10kHz for accurate field-oriented control |
| Fault Tolerance | ±16.5V input protection - withstands transient overvoltages common in motor drive and power-grid environments |
| Reference | +2.5V internal or +2.0V to +3.0V external - simplifies BOM by eliminating external reference IC in cost-sensitive designs |
Pinout & Package
MAX1322ECM is housed in a 48-pin LQFP package (7mm × 7mm footprint) with exposed thermal pad, rated for industrial temperature range (-40°C to +85°C). Pin assignments are identical across the MAX1320–MAX1322 family; only pins CH0–CH1, MSV, REFMS, and ALLON are active for this 2-channel variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channels | Dedicated differential-capable inputs for simultaneous sampling of two motor phase currents or voltage/current pairs |
| MSV | Midscale Voltage Reference Tie | Connected directly to AGND for bipolar operation-establishes 0V reference point for ±5V input range |
| REFMS / REF | Internal Reference Bypass | Shared node for internal +2.5V reference; bypassed with 0.1µF capacitor to AGND for noise immunity |
| CONVST | Convert-Start Control | Rising-edge triggered; initiates simultaneous sampling across all enabled channels with precise timing control |
| EOC / EOLC | Conversion Status Outputs | EOC signals completion of first conversion; EOLC marks end of final channel-enables pipelined data capture |
| D0–D13 | Parallel Data Bus | 14-bit bidirectional bus; outputs conversion results when RD and CS are low-compatible with 8051, ARM, and FPGA interfaces |
| INTCLK/EXTCLK | Clock Mode Select | Tied to AGND for external clock mode; tied to AVDD for internal 10MHz clock-no external oscillator required |
| SHDN | Power-Down Control | Active-high logic input; reduces total supply current to ≤2µA-ideal for intermittent measurement systems |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Independent T/H per channel preserves phase coherence across CH0/CH1-essential for real-time torque estimation |
| No Calibration Required | Guaranteed ±1.5 LSB INL and ±1 LSB DNL over temperature eliminates factory calibration steps and reduces test time |
| Bipolar ±5V Input Range | Direct interface with isolated sigma-delta modulator outputs or op-amp-based current-sense circuits without gain/offset adjustment |
| 10MHz T/H Bandwidth | Supports accurate digitization of fast transients (e.g., IGBT switching spikes) and high-frequency vibration signatures |
| Flexible Power Supplies | Separate AVDD (+4.75V to +5.25V) and DVDD (+2.7V to +5.25V) rails allow optimization of analog SNR and digital noise immunity |
| 48-Pin LQFP Package | Standard footprint compatible with automated optical inspection (AOI) and reflow processes-supports high-volume manufacturing |
Applications
| Multiphase Motor Control | Power-Grid Synchronization |
|---|---|
|
Use Scenario: Real-time acquisition of phase A and B currents in a 3-phase PMSM inverter during field-oriented control. IC Role / Device Role / Timing Role: Simultaneous sampling ADC providing time-aligned current vectors for Clarke/Park transforms. Use Value: 50ps channel-to-channel T/H matching ensures <0.003° phase error at 10kHz-critical for torque ripple minimization. |
Use Scenario: Capturing voltage and current waveforms at utility substation metering points for synchrophasor generation. IC Role / Device Role / Timing Role: High-fidelity ADC capturing synchronized samples across multiple analog inputs for IEEE C37.118 compliance. Use Value: 90dBc SFDR enables detection of harmonics up to 50th order under 50/60Hz fundamental conditions. |
| Power-Factor Monitoring | Vibration Analysis |
|
Use Scenario: Measuring line voltage and load current simultaneously to compute real/reactive/apparent power in industrial energy meters. IC Role / Device Role / Timing Role: Bipolar-input ADC accepting ±5V signals from isolation amplifiers feeding into DSP-based power calculation engine. Use Value: ±16.5V fault tolerance protects against surge events during lightning-induced grid disturbances. |
Use Scenario: Digitizing accelerometer outputs from rotating machinery bearings to detect early-stage mechanical faults. IC Role / Device Role / Timing Role: High-SNR ADC capturing broadband vibration spectra (DC–10kHz) with minimal quantization noise floor. Use Value: 76.5dB SINAD at 100kHz input ensures resolution of sub-millig acceleration levels in predictive maintenance systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8588SIPM | 8-channel, 16-bit, ±10V input, SPI interface, 250ksps/ch, no internal reference | Higher resolution but serial interface increases MCU overhead; requires external ±10V reference and driver amplifiers | Preferred when >14-bit resolution is mandatory and layout space permits additional support components |
| AD7606C-16BSTZ | 8-channel, 16-bit, ±10V input, parallel interface, 1MSPS aggregate, internal reference, 68-pin LQFP | Larger package, higher power (120mW vs. 230mW), wider input range-less optimal for compact 2-channel motor control PCBs | Selected when system requires 8-channel scalability and tighter DC accuracy (±0.5LSB INL) over temperature |
Compared with ADS8588SIPM and AD7606C-16BSTZ, the MAX1322ECM offers optimized integration for dual-channel industrial feedback loops-combining ±5V bipolar input, 48-pin LQFP footprint, internal reference, and simultaneous sampling in a single low-power IC without external support circuitry.
Availability
MAX1322ECM is available at Aetrix Electronics and suitable for multiphase motor control, power-grid synchronization, and power-factor monitoring applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1322ECM 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 and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing high reliability and performance under harsh environmental conditions.
The MAX1322ECM belongs to Maxim's simultaneous-sampling ADC product line, engineered specifically for closed-loop control systems where inter-channel timing coherence, fault resilience, and seamless microcontroller interfacing are critical design requirements.
FAQ
What is the maximum sample rate per channel for the MAX1322ECM when operating with two active channels?
The MAX1322ECM achieves a conversion time of 2.5µs for two channels, enabling a per-channel throughput of 400ksps in dual-channel mode. This is derived from the device's architecture: simultaneous sampling followed by sequential conversion readout. At full 8-channel operation, throughput drops to 250ksps per channel due to increased internal sequencing overhead. The MAX1322ECM maintains consistent timing regardless of channel count selected via the configuration register.
Does the MAX1322ECM require external calibration to meet its specified INL and DNL performance?
No, the MAX1322ECM does not require external calibration. It guarantees ±1.5 LSB integral nonlinearity (INL) and ±1 LSB differential nonlinearity (DNL) across the full industrial temperature range (-40°C to +85°C) without user calibration. This is achieved through factory-trimmed internal reference and SAR core compensation. The MAX1322ECM datasheet explicitly states "No Calibration Needed" as a key feature, reducing production test complexity and field recalibration requirements.
Can the MAX1322ECM operate with only an internal clock, and what is its frequency?
Yes, the MAX1322ECM can operate using its internal clock by tying the INTCLK/EXTCLK pin to AVDD. In this mode, it runs at a fixed 10MHz clock frequency, which drives both the track/hold and conversion logic. This eliminates the need for an external crystal or oscillator, simplifying board design. The internal clock supports all specified timing parameters-including 2.5µs two-channel conversion-and is fully characterized over temperature and supply voltage variations.
What is the purpose of the MSV pin on the MAX1322ECM, and how should it be connected?
On the MAX1322ECM, the MSV (Midscale Voltage) pin serves as the reference ground for the ±5V bipolar input range. For MAX1322ECM operation, MSV must be connected directly to AGND-this establishes the 0V midpoint for the input range. Unlike unipolar variants (e.g., MAX1318ECM), no capacitor is required at MSV for the MAX1322ECM. Incorrect connection (e.g., floating or capacitive tie) will cause offset errors and violate the specified ±40 LSB offset error limit.
How does the MAX1322ECM handle fault conditions on its analog inputs, and what protection voltage level is supported?
The MAX1322ECM provides robust analog input protection with ±16.5V fault tolerance on CH0 and CH1-meaning either input can safely withstand voltages from -16.5V to +16.5V relative to AGND without damage or latch-up, even when powered down. This protection is implemented via integrated clamping diodes and current-limiting structures. It is specifically designed for industrial environments where transients from relay switching, inductive loads, or ESD events may exceed normal operating ranges.
MAX1322ECM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 455k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 2:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1322ECM FAQ
1.How can I place an order for MAX1322ECM through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1322ECM 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 MAX1322ECM reliable?
The price and inventory of MAX1322ECM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1322ECM is usually 5 days.
3.What payment methods are accepted for MAX1322ECM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1322ECM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1322ECM?
MAX1322ECM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1322ECM 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 MAX1322ECM?
For technical support, including MAX1322ECM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1322ECM requirements.
6.How does Aetrix verify that MAX1322ECM is sourced from the original manufacturer or authorized distributors?
All MAX1322ECM 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 MAX1322ECM meets industry standards.
7.What is the process for return or replacement of MAX1322ECM?
All MAX1322ECM units undergo pre-shipment inspection (PSI). If there is an issue with MAX1322ECM, 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 MAX1322ECM part is unused and in its original packaging.
Return procedure for MAX1322ECM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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