Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown

 

Part Number	Replacement	Explanation

Description

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The MAX4465–MAX4469 are micropower op amps optimized for use as microphone preamplifiers. They provide the ideal combination of an optimized gain bandwidth product vs. supply current, and low-voltage operation in an ultra-small package. The MAX4465/MAX4467/MAX4469 are unity-gain stable and deliver a 200kHz gain bandwidth from only 24µA of supply current. The MAX4466/MAX4468 are decompensated for a minimum stable gain of +5V/V and provide a 600kHz gain bandwidth product. In addition these amplifiers feature rail-to-rail outputs, high A_VOL, plus excellent power-supply rejection and common-mode rejection ratios for operation in noisy environments.

The MAX4467/MAX4468 include a complete shutdown mode. In shutdown, the amplifiers' supply current is reduced to 5nA and the bias current to the external microphone is cut off for ultimate power savings. The single MAX4465/MAX4466 are offered in the ultra-small 5-pin SC70 package, while the single with shutdown MAX4467/MAX4468 and dual MAX4469 are available in the space-saving 8-pin SOT23 package.

MAX4465, MAX4466, MAX4467, MAX4468, MAX4469: Typical Operating Circuit Enlarge+

Key Features

• +2.4V to +5.5V Supply Voltage Operation
• Versions with 5nA Complete Shutdown Available (MAX4467/MAX4468)
• Excellent Power-Supply Rejection Ratio: 112dB
• Excellent Common-Mode Rejection Ratio: 126dB
• High A_VOL: 125dB (R_L = 100kΩ)
• Rail-to-Rail Outputs
• Low 24µA Quiescent Supply Current
• Gain Bandwidth Product:
  • 200kHz (MAX4465/MAX4467/MAX4469)
  • 600kHz A_V ≥ 5 (MAX4466/MAX4468)
• Available in Space-Saving Packages
  • 5-Pin SC70 (MAX4465/MAX4466)
  • 8-Pin SOT23 (MAX4467/MAX4468/MAX4469)

Applications/Uses

• Cell Phones
• Digital Dictation Devices
• Headsets
• Hearing Aids
• Microphone Preamplifiers
• Portable Computing
• Voice-Recognition Systems