MAX4465_V2 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown

19-1950; Rev 2; 6/12
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
General Description
The MAX4465–MAX4469 are micropower op amps opti-
mized for use as microphone preamplifiers. They pro-
vide the ideal combination of an optimized gain
bandwidth product vs. supply current, and low voltage
operation in ultra-small packages. The MAX4465/
MAX4467/MAX4469 are unity-gain stable and deliver a
200kHz gain bandwidth from only 24µA of supply cur-
rent. 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.
Applications
Microphone Preamplifiers
Hearing Aids
Cellular Phones
Voice-Recognition Systems
Digital Dictation Devices
Headsets
Portable Computing
Pin Configurations
TOP VIEW
+
IN+ 1
5 V_CC
MAX4465
GND 2 _MAX4466
IN- 3
4 OUT
Features
o +2.4V to +5.5V Supply Voltage Operation
o Versions with 5nA Complete Shutdown Available
(MAX4467/MAX4468)
o Excellent Power-Supply Rejection Ratio: 112dB
o Excellent Common-Mode Rejection Ratio: 126dB
o High A_VOL: 125dB (R_L = 100kΩ)
o Rail-to-Rail Outputs
o Low 24µA Quiescent Supply Current
o Gain Bandwidth Product:
200kHz (MAX4465/MAX4467/MAX4469)
600kHz A_V ≥ 5 (MAX4466/MAX4468)
o Available in Space-Saving Packages
5-Pin SC70 (MAX4465/MAX4466)
8-Pin SOT23 (MAX4467/MAX4468/MAX4469)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX4465EXK+T
-40°C to +85°C 5 SC70
MAX4465EUK+T
-40°C to +85°C 5 SOT23
MAX4466EXK+T
-40°C to +85°C 5 SC70
MAX4466EUK+T
-40°C to +85°C 5 SOT23
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
RBIAS
CBIAS
RBIAS
CIN RIN
CBYPASS
MIC_BIAS
RDC
IN+
IN-
RDC
VCC
SHDN
OUT
MAX4467
MAX4468
GND
SC70/SOT23
Pin Configurations continued at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
MICROPHONE
CAPSULE
RFB
MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH
COMPLETE SHUTDOWN
For pricing, delivery, and ordering information, please contact Maxim Direct
1
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.