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AD8644AR
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Product Detailed Parameters
- Description：IC OPAMP GP R-R 5.5MHZ 14SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Amplifier Type：General Purpose
- Number of Circuits：4
- Output Type：Rail-to-Rail
- Slew Rate：7.5V/µs
- Gain Bandwidth Product：5.5 MHz
- Current - Input Bias：80 nA
- Voltage - Input Offset：1 mV
- Current - Supply：800µA (x4 Channels)
- Current - Output / Channel：70 mA
- Voltage - Supply Span (Min)：5 V
- Voltage - Supply Span (Max)：18 V
- Operating Temperature：-20°C ~ 85°C
- Grade：-
- Mounting Type：Surface Mount
- Package / Case：14-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：14-SOIC
- -3db Bandwidth：-
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Overview
The AD8644AR is a quad operational amplifier from Analog Devices, utilizing the HV XFCB process for high voltage and extra fast complementary bipolar performance. It features a unity-gain bandwidth of 5.5 MHz and a slew rate of 7.5 V/μs. The device operates on single supplies ranging from 5 V to 18 V, with a typical supply current of 800 μA per amplifier. It provides rail-to-rail inputs and outputs, an output short-circuit current of up to 70 mA, and maintains stability with large capacitive loads.
Feature Summary
- Rail-to-rail input and output stages maximize dynamic range in single-supply applications.
- High output drive capability supports direct driving of heavy capacitive loads without external compensation.
- Low power consumption design ensures suitability for portable and densely packed instrumentation.
- Immunity to output phase reversal prevents signal distortion when input voltages approach supply rails.
Applications
- LCD gamma and VCOM drivers
- Modems and direct access arrangements
- Portable battery-powered instrumentation
- Audio headphone and line-out amplifiers
Procurement Notes
Verify package type (SOIC-14) and temperature range (-20°C to +85°C). Confirm RoHS compliance status via suffix if required. Check datasheet for absolute maximum ratings regarding supply voltage and thermal dissipation limits before integration.
Selection Notes
Select this component for applications requiring high output current and capacitive load stability. Ensure supply voltage remains within 5 V to 18 V. Consider thermal resistance values for heat dissipation calculations in enclosed environments.
Part Context
Part of the AD8614/AD8644 family designed for LCD monitor applications. Manufactured using Analog Devices' proprietary HV XFCB process, which lowers internal parasitic capacitance to improve gain bandwidth and phase margin compared to standard CMOS op-amps.
Replacement Considerations
No public confirmed substitute part numbers are documented in the provided source material.
FAQ
Does the AD8644AR include built-in short-circuit protection?
No, the device lacks built-in short-circuit protection. Shorting the output directly can destroy the device; a series resistor is recommended for protection.
How does the AD8644 handle input overvoltage conditions?
Internal 1.5 kΩ resistors limit input current during overvoltage events. If currents exceed 5 mA, an external series resistor should be added to prevent damage.
