Analog Devices Inc. ADM2914-1ARQZ

Overview

ADM2914-1ARQZ from Analog Devices is a quad UV/OV voltage supervisor IC designed to monitor up to four independent power rails-two positive and two negative-for simultaneous undervoltage and overvoltage conditions. It features ±1.5% threshold accuracy over −40°C to +125°C, 1 V buffered reference output (REF), open-drain UV/OV reset outputs, and adjustable reset timeout via external TIMER capacitor. It is used in FPGA/DSP core-I/O voltage monitoring and server supply supervision.

For engineers reviewing the ADM2914-1ARQZ datasheet, ADM2914-1ARQZ pinout, ADM2914-1ARQZ application, or ADM2914-1ARQZ equivalent, key selection considerations include latching OV behavior, SEL-configurable polarity for VH3/VL3/VH4/VL4 inputs, shunt-regulated VCC operation up to 6.6 V, and guaranteed functionality down to VCC = 1 V with 62 μA supply current.

Technical Context

The ADM2914-1ARQZ implements four independent comparator pairs (VHx/VLx) referenced to a precision 500 mV internal threshold, enabling dual-direction monitoring per rail. Its three-state SEL pin configures polarity of inputs 3 and 4 for positive or negative supply detection, while REF provides a stable 1 V offset for negative-rail resistor-divider biasing.

It integrates an internal 6.6 V shunt regulator on VCC, allowing direct connection to supplies >6 V when paired with a current-limiting dropper resistor. The LATCH pin enables manual clearing of the latched OV output-a distinguishing feature of the -1 variant versus the -2 disable-pin version.

Key Specifications

Pinout & Package

ADM2914-1ARQZ is housed in a 16-lead QSOP package (3.9 mm × 4.9 mm, 1.0 mm height) with standard 0.635 mm lead pitch and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage supervisor applications.

Compared with ADM2914-2ARQZ, the ADM2914-1ARQZ provides deterministic fault persistence via hardware-latched OV, critical for safety shutdowns; compared with TPS3307-18DGNR, it delivers full quad-rail configurability, negative-rail support, and user-adjustable thresholds - making it irreplaceable in high-integrity, multi-rail embedded systems.

Availability

ADM2914-1ARQZ is available at Aetrix Electronics and suitable for server supply monitoring, FPGA/DSP core and I/O voltage monitoring, and medical imaging power management requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADM2914-1ARQZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM2914 product line delivers precision multi-rail voltage supervision for mission-critical power systems, emphasizing threshold accuracy, mixed-polarity support, and robust fault-handling - targeting high-reliability infrastructure equipment.

FAQ

What is the function of the LATCH pin on the ADM2914-1ARQZ?

The LATCH pin on the ADM2914-1ARQZ controls the overvoltage output behavior: when pulled low, the OV pin latches low upon fault detection and remains asserted until LATCH is briefly pulled high. This enables persistent fault signaling without continuous polling. The ADM2914-1ARQZ requires this pin to be actively managed to clear latched states - unlike the ADM2914-2ARQZ which uses a DIS pin instead.

Can the ADM2914-1ARQZ monitor negative voltage rails?

Yes, the ADM2914-1ARQZ monitors negative rails using its REF pin (1 V buffered output) as an offset for external resistor dividers on VH3/VL3/VH4/VL4 inputs. The SEL pin configures polarity: when SEL = GND or open, inputs 3 and 4 detect negative supplies - VLx rising above 0.5 V triggers undervoltage, VHx falling below 0.5 V triggers overvoltage. This capability is confirmed in the Functional Block Diagram and Polarity Configuration table of the ADM2914-1ARQZ datasheet.

What is the maximum supply voltage that can be applied to the VCC pin of the ADM2914-1ARQZ?

The ADM2914-1ARQZ VCC pin supports up to 6 V directly. For higher voltages (e.g., 12 V), its internal 6.6 V shunt regulator activates - but a current-limiting dropper resistor must be placed between the supply and VCC to restrict ICC to ≤10 mA. Absolute maximum rating is 6 V without resistor; exceeding this without current limiting risks permanent damage per Absolute Maximum Ratings Table 2.

How is the reset timeout period set on the ADM2914-1ARQZ?

The reset timeout period (tUOTO) on the ADM2914-1ARQZ is set by an external capacitor (CTIMER) connected between the TIMER pin and GND. With CTIMER = 1 nF, tUOTO = 8.5 ms typical; the relationship follows tUOTO ≈ 115 × CTIMER (in seconds). To bypass timing, connect TIMER directly to VCC. Values from 10 pF to 100 nF are supported, and leakage must be <1.3 μA to avoid timing drift.

Does the ADM2914-1ARQZ require external resistors for voltage monitoring?

Yes, the ADM2914-1ARQZ requires external resistor dividers on each monitored rail to scale input voltages to its 500 mV internal threshold. For positive rails, three-resistor networks (RX, RY, RZ) set UV/OV points; for negative rails, the REF pin provides the 1 V offset needed for proper scaling. These configurations are detailed in Figures 17 and 18 of the ADM2914-1ARQZ datasheet and are mandatory for accurate supervision.