MAX4063EUD+ Maxim Integrated, MAX4063EUD+ Datasheet - Page 7

• Manufacturer Part Number: MAX4063EUD+
• Description: Microphone Preamplifiers Integrated Circuits (ICs)
• Manufacturer: Maxim Integrated

Specifications of MAX4063EUD+

• Factory Pack Quantity: 96

The MAX4063 is a differential microphone pre-
amplifier providing high-quality amplification, optimized
for use in computer and mobile applications. This device
features adjustable gain, very high power-supply rejec-
tion (95dB), and common-mode rejection (79dB), making
it ideal for low-noise applications. The MAX4063 provides
a differential input stage, making the device particularly
effective when layout constraints force the microphone
amplifier to be physically remote from the ECM micro-
phone.
The MAX4063 is capable of switching its output
between the differential input and an inverting single-
ended input. INT/AUX selects either the differential
input or single-ended auxiliary input. In addition, the
MAX4063 has an integrated microphone bias source,
simplifying system design and eliminating the need for
TSSOP
10
11
12
13
14
—
1
2
3
4
5
6
7
8
9
PIN
6, 8, 14
TQFN
15
16
10
11
12
13
—
Differential Microphone Preamplifier with
1
2
3
4
5
7
9
_______________________________________________________________________________________
Detailed Description
Internal Bias and Complete Shutdown
INT/AUX
AUX_IN
NAME
SHDN
BIAS
GND
OUT
OUT
N.C.
V
ADJ
IN+
G2
IN-
G1
EP
CC
Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for
the differential amplifier (see Adjustable Differential Gain-Setting section).
Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select
differential in or high to select auxiliary in.
Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown
mode.
Amplifier Output. OUT is high impedance when in shutdown mode.
External Electret Microphone Capsule Bias Output. Bypass BIAS with a 1µF capacitor to
ground.
Power Supply. Bypass the V
Adjustable Gain Select for AUX_IN (see Auxiliary Input-Gain Adjustment section). Connect
a 10pF capacitor between OUT and ADJ.
Complementary Amplifier Output. OUT is high impedance in shutdown mode.
Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+.
Inverting Differential Amplifier Input. AC-couple the audio signal into IN-.
Ground
Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into AUX_IN.
No Connection. Not internally connected.
Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for
the differential amplifier.
Exposed Pad (TQFN Only). Internally connected to GND. Connect to a large ground plane
to maximize thermal performance. Not intended as an electrical connection point.
CC
external components. The MAX4063 has a complemen-
tary output allowing CODECs and other devices with
differential inputs to be optimally driven (see Functional
Diagram ). The MAX4063 includes a 0.3µA shutdown
mode for ultimate power savings. The differential gain
of the MAX4063 is set with a single resistor connected
between the G1 and G2 pins. The MAX4063 has an
internal default gain of 20V/V on the AUX_IN input. The
AUX_IN gain can be increased with a single external
resistor (see the Differential-Gain Adjustment and
Auxiliary Input-Gain Adjustment sections).
The main microphone amplifier is a low-noise, differen-
tial input structure. This is an almost essential element
when faced with amplification of low-amplitude analog
signals in digitally intense environments such as note-
to GND with a 0.1µF capacitor.
FUNCTION
Pin Description
Differential Input
7