Analog Devices Inc. ADM1069ASTZ-REEL7

Overview

ADM1069ASTZ-REEL7 from Analog Devices is a configurable supervisory and sequencing IC with integrated 12-bit ADC, four 8-bit DACs, and an 8-state programmable sequencing engine. It monitors up to eight voltage rails with <1.0% accuracy across temperature, provides closed-loop voltage margining for four supplies, and drives N-FET gates via charge-pumped outputs (PDO1–PDO6). It is used in multivoltage server line cards requiring precise power-up/down sequencing and in-circuit supply validation.

For engineers reviewing the ADM1069ASTZ-REEL7 datasheet, ADM1069ASTZ-REEL7 pinout, ADM1069ASTZ-REEL7 application, or ADM1069ASTZ-REEL7 equivalent, key selection criteria include its 32-lead LQFP package, SMBus interface, ±1% supply fault detection accuracy, 12-bit ADC readback capability, and support for both high-voltage FET gate drive and low-voltage logic enable functions.

Technical Context

The ADM1069ASTZ-REEL7 implements a state-machine-based Sequencing Engine (SE) supporting up to 63 programmable states, enabling conditional output transitions based on input events such as undervoltage faults or digital signals. Its dual-function VXx inputs serve either as high-impedance analog comparators (0.573 V–1.375 V thresholds) or general-purpose logic inputs.

Power arbitration selects the highest valid supply among VH (3.0–14.4 V) or VPx (3.0–6.0 V) pins to generate a regulated 4.75 V VDDCAP rail; no external regulator is needed. The device integrates a 2.048 V reference (±0.25%) for ADC/DAC operation, with REFIN configurable for external reference use to improve ADC gain error to ±0.05%.

Key Specifications

Pinout & Package

The ADM1069ASTZ-REEL7 is housed in a 32-lead, 7 mm × 7 mm LQFP package with exposed thermal pad (not electrically connected). Pin 1 is marked with a dot; all ground pins (GND, AGND, REFGND, PDOGND) must be tied together in layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS659122ZWSR and MAX16050ATL+, the ADM1069ASTZ-REEL7 uniquely combines high-voltage FET gate drive, closed-loop margining, and 12-bit voltage readback in a single SMBus-configurable IC - eliminating external components required by alternatives to achieve equivalent system-level functionality.

Availability

ADM1069ASTZ-REEL7 is available at Aetrix Electronics and suitable for server motherboard design, telecom line card development, FPGA power management, and automated test equipment requiring stable component supply and long-term lifecycle support.

Supply support for ADM1069ASTZ-REEL7 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.

The ADM1069 product line delivers integrated power supervision and sequencing solutions for complex multivoltage systems in datacenter, telecom, and industrial infrastructure - emphasizing configurability, accuracy, and system-level fault resilience.

FAQ

What is the maximum supply voltage the ADM1069ASTZ-REEL7 can monitor on its VH pin?

The ADM1069ASTZ-REEL7 supports a maximum input voltage of 14.4 V on the VH pin, with three selectable attenuation ranges (high: 6–14.4 V, mid: 2.5–6 V). This allows direct supervision of 12 V backplane supplies without external resistive dividers. Absolute maximum rating is 16 V, but operation above 14.4 V violates specification limits and risks measurement inaccuracy. The VH pin also serves as a redundant power source for the device itself.

Does the ADM1069ASTZ-REEL7 support closed-loop voltage margining, and how is it implemented?

Yes, the ADM1069ASTZ-REEL7 implements closed-loop voltage margining using its four 8-bit DACs and integrated 12-bit ADC. Each DAC adjusts the feedback node or reference of a dc-dc converter, while the ADC simultaneously reads back the resulting rail voltage. This loop enables real-time verification that the margining offset (e.g., −5%) is accurately applied. The ADM1069ASTZ-REEL7 executes this autonomously via SMBus commands without host processor intervention.

What are the key differences between PDO1–PDO6 and PDO7–PDO8 on the ADM1069ASTZ-REEL7?

PDO1–PDO6 support charge-pumped high-voltage drive (up to 14 V), enabling direct control of N-FET gates in high-side switch configurations. PDO7–PDO8 operate as low-voltage push-pull outputs referenced to VDDCAP or VPx, suitable for logic-level enables. Only PDO1–PDO6 integrate the internal charge pump; PDO7–PDO8 lack this circuitry and cannot drive >6 V loads. All eight outputs are software-configurable via the Sequencing Engine and EEPROM.

Can the ADM1069ASTZ-REEL7 be powered solely from the VXx pins?

No, the ADM1069ASTZ-REEL7 cannot be powered from the VXx pins. Power arbitration exclusively selects among VH and VP1–VP3 pins - the VXx inputs are high-impedance analog/digital monitoring pins with no power delivery capability. Attempting to power the device from VXx will result in failure to initialize. The minimum valid supply is 3.0 V on either VH or any VPx pin, generating a regulated 4.75 V VDDCAP rail.

How does the ADM1069ASTZ-REEL7 handle brownout conditions on its supply inputs?

During brownout, the ADM1069ASTZ-REEL7's VDD arbitrator disables the failing supply path and switches to the next highest valid input. The 10 µF capacitor on VDDCAP acts as a reservoir, sustaining operation for milliseconds while the transition occurs. Internal synchronous rectifier switches minimize dropout (~0.2 V), allowing continued function down to 3.0 V input. This behavior is inherent to the architecture and requires no firmware or configuration changes.