Analog Devices Inc. ADM1064ASU

Overview

ADM1064ASU from Analog Devices is a configurable supervisory and sequencing IC for multivoltage systems, integrating 10 supply fault detectors (±1% accuracy across −40°C to +85°C), a 12-bit SAR ADC for voltage readback of up to 12 channels, and 10 programmable driver outputs (PDOs) with dual-mode operation (LV logic or HV FET gate drive). It enables precise power-up/down sequencing in DSP/FPGA boards and telecom line cards.

For engineers reviewing the ADM1064ASU datasheet, ADM1064ASU pinout, ADM1064ASU application, or ADM1064ASU equivalent, key selection considerations include its 40-lead LFCSP package, SMBus programmability, 12 V charge-pumped PDO output capability (PDO1–PDO6), 0.573 V to 14.4 V supervision range, and integrated EEPROM for configuration persistence.

Technical Context

The ADM1064ASU implements a state-machine-based Sequencing Engine (SE) supporting up to 63 programmable states, enabling conditional transitions based on input events (e.g., supply OK, fault detection, watchdog timeout). Its architecture decouples supervision logic from sequencing control via dedicated SFDs and configurable PDO drivers.

Power is autonomously arbitrated among VH (up to 14.4 V) and VPx (up to 6.0 V) inputs, generating a regulated 4.75 V VDDCAP supply with <0.2 V dropout. The 12-bit ADC uses an internal 2.048 V reference (REFOUT) or external REFIN, with round-robin scanning across VH, VP1–VP4, VX1–VX5, AUX1, AUX2, and REFIN.

Key Specifications

Pinout & Package

ADM1064ASU is housed in a 40-lead LFCSP (Lead Frame Chip Scale Package) with 6 mm × 6 mm footprint and exposed thermal pad (NC, soldered for mechanical stability only).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multirail supervisory sequencing applications.

Compared with ADM1064ASU, ADM1168ACPZ offers identical packaging and HV PDO capability but omits ADC-based telemetry, while TPS40422RTWR provides PMBus compatibility and smaller footprint but lacks the 12 V charge-pumped outputs needed for direct N-FET control - making ADM1064ASU uniquely suited for high-voltage sequencing with integrated diagnostics.

Availability

ADM1064ASU is available at Aetrix Electronics and suitable for telecom line cards, server power subsystems, FPGA development platforms, and in-circuit margining test fixtures requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADM1064ASU 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.

The ADM1064ASU belongs to Analog Devices' Super Sequencer® family, engineered specifically for robust, software-configurable power supervision and sequencing in multivoltage infrastructure equipment where reliability, precision, and integration are critical.

FAQ

What is the primary function of the ADM1064ASU in a power system?

The ADM1064ASU serves as a fully configurable supervisory sequencer that monitors up to 10 voltage rails with ±1% accuracy, executes programmable power-up/down sequences via its 63-state Sequencing Engine, and provides 12-bit ADC-based voltage readback. In systems like telecom line cards, the ADM1064ASU replaces discrete supervisors and timers, centralizing control while enabling real-time telemetry and fault response - all within a single 40-lead LFCSP package.

How does the ADM1064ASU handle power supply redundancy?

The ADM1064ASU implements autonomous power arbitration among VH (up to 14.4 V) and VP1–VP4 (up to 6.0 V) inputs, selecting the highest valid supply ≥3.0 V to generate its internal 4.75 V VDDCAP rail. This architecture ensures continuous operation during partial supply loss - for example, if the 12 V backplane fails, the device seamlessly switches to a 3.3 V auxiliary rail. The ADM1064ASU's VDDCAP remains stable even during transient brownouts, thanks to an external 10 μF reservoir capacitor.

Can the ADM1064ASU drive N-channel MOSFETs directly?

Yes - six of the ADM1064ASU's programmable driver outputs (PDO1–PDO6) feature an internal charge pump that delivers 11–14 V at up to 20 μA average current, sufficient to fully enhance common N-channel power FETs used in high-side switching applications. This eliminates external level-shifting circuitry. The remaining four PDOs (PDO7–PDO10) operate in LV mode, providing push-pull or weak pull-up outputs referenced to VDDCAP or VPx - ideal for enabling DC/DC converters or asserting reset signals.

What interfaces does the ADM1064ASU support for configuration and monitoring?

The ADM1064ASU uses a standard 400 kHz SMBus 2-wire interface (SDA/SCL pins) for full read/write access to all registers, including supply thresholds, sequencing states, PDO configurations, and ADC results. Configuration data is stored in 256 bytes of on-chip EEPROM, enabling autonomous operation at power-up without host intervention. Analog Devices provides a GUI-based configuration tool that communicates with the ADM1064ASU over SMBus to simplify setup and validation of complex sequencing logic.

Does the ADM1064ASU require an external voltage reference for ADC operation?

No - the ADM1064ASU integrates a precision 2.048 V ±0.25% reference (REFOUT) that can be directly connected to its REFIN pin to serve as the ADC reference. This eliminates the need for an external reference and ensures consistent 12-bit conversion accuracy across temperature. Alternatively, a higher-accuracy external reference may be applied to REFIN for improved ADC performance in metrology-grade applications, but the internal REFOUT is sufficient for typical power-supply monitoring tasks.