Analog Devices Inc./Maxim Integrated MAX1320ECM

Overview

The MAX1320ECM from Maxim Integrated is a 14-bit, 8-channel simultaneous-sampling analog-to-digital converter (ADC) with ±5V input range and ±16.5V fault-tolerant inputs. It achieves 250ksps per channel throughput across all eight channels, features independent track/hold circuitry per channel, and operates from +4.75V to +5.25V analog and +2.7V to +5.25V digital supplies. It is used in multiphase motor control systems requiring precise phase-aligned voltage/current sampling.

For engineers reviewing the MAX1320ECM datasheet, MAX1320ECM pinout, MAX1320ECM application, or MAX1320ECM equivalent, key selection criteria include its bipolar ±5V input range, 8-channel simultaneous sampling capability, 14-bit resolution with ±1.5 LSB INL, 48-pin LQFP package, and support for internal or external clocking - all critical for power-grid synchronization and vibration analysis designs.

Technical Context

The MAX1320ECM implements eight independent track/hold amplifiers enabling true simultaneous sampling across all channels, preserving inter-channel phase relationships essential for vector-based measurements. Its architecture supports both internal 10MHz clock and external clock up to 12.5MHz, with conversion timing tightly controlled by CONVST edge-triggered sequencing.

It uses a 14-bit parallel interface (D0–D13) operating at up to 16.6MHz, with RD/WR/CS control logic and EOC/EOLC status outputs. The device accepts either an internal +2.5V reference or an external +2.0V to +3.0V reference, and requires separate analog/digital ground connections (AGND/DGND) tied at a single point for optimal noise performance.

Key Specifications

Pinout & Package

MAX1320ECM is housed in a 48-pin LQFP package (7mm × 7mm footprint) with exposed thermal pad, rated for operation from –40°C to +85°C. Pin functions are validated per Maxim's official pin description table for MAX1320 variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit simultaneous-sampling ADC applications.

Compared with AD7606BSTZ and ADS8588SIPM, the MAX1320ECM offers the only combination of ±5V native input range, 250ksps/channel throughput, internal +2.5V reference, and 14-bit parallel interface - making it uniquely suited for cost-sensitive, space-constrained motor control boards needing fast deterministic readout.

Availability

MAX1320ECM is available at Aetrix Electronics and suitable for multiphase motor control, power-grid synchronization, and power-factor monitoring applications requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term industrial lifecycle support.

Supply support for MAX1320ECM 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.

The MAX1320ECM belongs to Maxim's high-performance simultaneous-sampling ADC product line, engineered specifically for phase-critical power electronics and energy measurement systems demanding bipolar input handling and robust fault tolerance.

FAQ

What is the maximum sample rate per channel for the MAX1320ECM in 8-channel mode?

The MAX1320ECM achieves 250ksps per channel when all eight inputs are active. This is measured with a 10MHz internal clock and reflects sustained throughput under full-channel load, enabling accurate reconstruction of signals up to 125kHz per Nyquist criterion. The MAX1320ECM maintains this rate across its full operating temperature range (–40°C to +85°C) with no derating.

Does the MAX1320ECM require an external reference voltage, or does it have an internal one?

The MAX1320ECM includes an internal +2.5V reference with ±25mV initial accuracy and 30ppm/°C temperature coefficient, eliminating the need for external reference in most applications. It also supports external reference voltages from +2.0V to +3.0V applied to REF and REFMS pins, providing flexibility for higher-accuracy or ratiometric measurement setups. The MAX1320ECM automatically configures its reference network for bipolar operation when MSV is tied to AGND.

How does the MAX1320ECM handle channel selection and power optimization?

The MAX1320ECM uses the ALLON pin to globally enable or disable all eight analog input channels. When ALLON is low, only channels selected via the write-only configuration register remain active - reducing analog supply current from 46mA (all channels) to approximately 10mA (single channel). This dynamic channel gating, combined with SHDN pin for full shutdown (<2µA), allows fine-grained power management in battery-powered or thermally constrained systems using the MAX1320ECM.

What is the purpose of the MSV pin on the MAX1320ECM, and how should it be connected?

On the MAX1320ECM, the MSV (Midscale Voltage) pin must be connected directly to AGND to configure the device for bipolar ±5V operation. This differs from unipolar variants (e.g., MAX1316ECM), which require a 2.2µF + 0.1µF capacitor from MSV to AGND. Correct MSV grounding ensures proper internal common-mode biasing of the ADC core and reference ladder, guaranteeing accurate zero-crossing detection and full-scale symmetry in the MAX1320ECM's transfer function.

Can the MAX1320ECM interface directly with a 3.3V microcontroller without level shifters?

Yes - the MAX1320ECM's digital interface (D0–D13, RD, WR, CS, EOC) is compatible with 3.3V logic when DVDD is supplied at +3.3V. Its VIH threshold is 0.7 × DVDD (≥2.31V) and VIL is 0.3 × DVDD (≤0.99V), ensuring reliable recognition of 3.3V logic levels. However, the analog section remains powered from AVDD (+5V), so the MAX1320ECM supports mixed-voltage operation without external level translation on its parallel bus.