Analog Devices Inc. AD8647ARMZ

Overview

AD8647ARMZ from Analog Devices is a dual, rail-to-rail input/output operational amplifier with integrated shutdown control, housed in a 10-lead MSOP package. It delivers 24 MHz gain bandwidth, 11 V/μs slew rate, 2.5 mV max offset voltage, and 8 nV/√Hz noise density-enabling precision signal conditioning in battery-powered instrumentation and photodiode amplifiers.

For engineers reviewing the AD8647ARMZ datasheet, AD8647ARMZ pinout, AD8647ARMZ application, or AD8647ARMZ equivalent, key selection factors include its dual-channel architecture with independent shutdown pins (SDA/SDB), low 2 mA per amplifier supply current, and guaranteed operation from −40°C to +125°C for automotive and industrial environments.

Technical Context

The AD8647ARMZ implements a CMOS input stage with 1 pA typical input bias current and rail-to-rail output swing, supporting single-supply operation from 2.7 V to 5.5 V. Its unity-gain stable architecture achieves 74° phase margin at 5 V supply and maintains 53° at 2.7 V, ensuring robust closed-loop performance across voltage rails.

Shutdown functionality is implemented via two CMOS-compatible logic inputs (SDA and SDB), each requiring <0.8 V for power-down and >2.0 V for enable. In shutdown mode, supply current drops to 10 nA typical, and outputs enter high-impedance state-enabling wire-OR multiplexing without external switches.

Key Specifications

Pinout & Package

AD8647ARMZ is packaged in a 10-lead MSOP (RM-10) with 0.5 mm pitch, 3.0 mm × 3.0 mm footprint, and exposed pad for thermal enhancement. Pin 1 identifier is marked with a dot; device is RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual op-amp with shutdown applications.

Compared with AD8646ARMZ and OPA2333AIDRGT, AD8647ARMZ uniquely balances low-noise AC performance, ultra-low shutdown current, and dual independent enable-making it optimal for battery-constrained systems requiring selective channel activation.

Availability

AD8647ARMZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode amplification, and barcode scanner signal chains requiring stable component supply across automotive and industrial temperature ranges.

Supply support for AD8647ARMZ 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 AD864x family was designed for precision, low-power, rail-to-rail signal conditioning in space- and energy-constrained applications-including portable test equipment, optical sensors, and automotive subsystems.

FAQ

What is the maximum operating supply voltage for AD8647ARMZ?

The AD8647ARMZ has an absolute maximum supply voltage rating of 6 V. Continuous operation above 5.5 V risks permanent damage. For reliable long-term use, the recommended supply range remains 2.7 V to 5.5 V as specified in the datasheet, with full parametric performance guaranteed across this window. Exceeding 5.5 V-even briefly-may trigger latch-up or junction breakdown in the AD8647ARMZ.

Does AD8647ARMZ support true rail-to-rail input common-mode range?

Yes, AD8647ARMZ supports rail-to-rail input common-mode voltage from V– to V+, including both supply rails. At 5 V supply, inputs operate from 0 V to 5 V; at 2.7 V supply, from 0 V to 2.7 V. This is confirmed in Table 1 and Table 2 of the datasheet under "Input Voltage Range (VCM)", enabling direct interfacing with CMOS logic outputs and unbuffered DACs without external level shifting.

How does the shutdown feature affect output state in AD8647ARMZ?

When either SDA or SDB is driven below 0.8 V, the corresponding amplifier output enters high-impedance (Hi-Z) state-neither sourcing nor sinking current. The output remains electrically disconnected, preventing loading of downstream circuitry. This behavior is explicitly documented in the Power-Down Operation section and Figure 41–45 waveforms, confirming that AD8647ARMZ outputs do not default to V– or V+ during shutdown.

Can AD8647ARMZ drive a 600 Ω load at 25 kHz with low THD+N?

Yes, AD8647ARMZ achieves 0.010% THD+N driving a 600 Ω load at 25 kHz with AV = +1 and 0.1 V_PP output, as measured in Table 4 of the datasheet. This performance holds at 5 V supply and 25°C ambient, making it suitable for audio line drivers and high-fidelity sensor signal chains where harmonic distortion must remain below −80 dB.

Is AD8647ARMZ pin-compatible with other devices in the AD864x family?

No, AD8647ARMZ is not pin-compatible with AD8646ARMZ or AD8648 variants. While all share MSOP packaging, AD8647ARMZ uses a 10-lead MSOP (RM-10) with dedicated SDA/SDB pins (Pins 5 and 6), whereas AD8646ARMZ uses an 8-lead MSOP (RM-8) with Pins 5/6 unassigned. Swapping packages requires PCB redesign-confirmed by Figures 1 and 2 and the Ordering Guide.