MAXIM MAX4063 User Manual

General Description

The MAX4063 is a differential-input microphone preampli­fier optimized for high-performance, portable applica­tions. The device features two selectable inputs,
differential outputs, adjustable gain, an integrated low­noise bias source, and a low-power shutdown mode.
Two input paths provide both differential and single­ended microphone sensing. The high-noise rejection of
the differential input is ideally suited to an internal micro­phone where system noise and long-run PC board traces
can degrade low-level signals. The single-ended input
provides a simple connection to an external microphone.

The differential and single-ended inputs have indepen­dent, adjustable gains that are set with a single external
resistor. Differential outputs provide a full-scale signal of
up to 6V

P-P

from a single 3V supply, optimizing the
dynamic range of the amplified signal. A complete shut­down mode reduces the supply current to only 0.3µA
and disables the microphone bias for the ultimate in
power savings.

The MAX4063 operates from 2.4V to 5.5V and is specified
over the extended -40°C to +85°C operating temperature
range. The MAX4063 is available in both 16-pin thin QFN
(4mm x 4mm x 0.8mm) and 14-pin TSSOP packages.

Applications

Features

♦ 2.4V to 5.5V Single-Supply Operation
♦ Differential Inputs and Outputs
♦ Adjustable Gain
♦ High 95dB PSRR
♦ High 79dB CMRR
♦ Low-Noise, Integrated Microphone Bias
♦ 750µA Supply Current
♦ 0.3µA Shutdown Current
♦ ±4kV ESD Protection (AUX_IN)
♦ THD+N: 0.05% at 1kHz
♦ Available in Space-Saving Packages

14-Pin TSSOP
16-Pin Thin QFN (4mm x 4mm x 0.8mm)

MAX4063

Differential Microphone Preamplifier with

Internal Bias and Complete Shutdown

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

Ordering Information

19-2753; Rev 0; 1/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Notebook Audio Systems

Tablet PCs

PDA Audio Systems

Signal Conditioning

Pin Configurations

Pin Configurations continued at end of data sheet.

*Future product—contact factory for availability.
**EP = Exposed paddle.

PART TEMP RANGE PIN-PACKAGE

MAX4063ETE* -40°C to +85°C 16 Thin QFN-EP**

MAX4063EUD -40°C to +85°C 14 TSSOP

2.4V TO 5.5V

6

V

SHDN

AUX_IN

CC

INT/AUX

ADJ

3

12

2

7

1

G2

2

INT/AUX

3

SHDN

4

MAX4063

BIAS

5

V

6

CC

7

TSSOP

14

G1

13

N.C.

12

AUX_IN

11

GNDOUT

IN-

10

9

IN+

OUTADJ

8

5

9

10

MAX4063

BIAS

IN+

IN-

R

G

V

BIAS

G1 G2
14

1

OUT

OUT 8

GND

11

4

MAX4063

Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 3V, GND = 0V, SHDN = V

CC,

INT/AUX = 0V, RG= 11.11kΩ, RL= 100kΩ to 1.5V, R

BIAS

= ∞, V

OUT

is measured between OUT

and OUT. T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1 and 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (VCCto GND). .................................-0.3V to +6V

Any Other Pin to GND ................................-0.3V to (V

CC

+ 0.3V)

Duration of Short Circuit to GND or V

CC

....................Continuous

Continuous Input Current (any pin) ................................ ±10mA

Continuous Power Dissipation (T

A

= +70°C)

14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........667mW

16-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Supply Voltage Range V

Supply Current I

Output Common-Mode Voltage V

Slew Rate SR AV = 20V/V ±1 V/µs

Supply Current in Shutdown I

Output Short-Circuit Current I

DIFFERENTIAL INPUT (INT/AUX = 0V)

Input Offset Voltage V

Common-Mode Input Voltage Range V

Maximum Differential Input Voltage V

Small-Signal Bandwidth BW

Input Resistance R

Input Resistance Match R

Input Noise-Voltage Density e

RMS Output Noise Voltage V

Total Harmonic Distortion Plus Noise THD+N

Common-Mode Rejection Ratio CMRR VCM = 500mV

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Inferred from PSRR test 2.4 5.5 V

CC

CC

OCM

SHDNV SHDN

SC

OS

CM

DIFFMAXAV

-3dB

IN

MATCH

n

NRMSAV

VDIFF

= 0V 0.001 1 µA

To GND 30

To V

CC

TA = +25°C ±1mV

Inferred from CMRR test 1 2 V

= 2V/V 1 V

Either differential input 100 kΩ

AV = 20V/V, f = 1kHz 70

AV = 200V/V, f = 1kHz 12

= 20V/V, BW = 22Hz to 22kHz 225 µV

A

= 20V/V, f = 1kHz, V

V

BW = 22Hz to 22kHz

1V < VCM < 2V,
V

= 0.7V

OUT

TA = +25°C95

TA = T

V

CC

- T

MIN

= 5V ±100mV, f = 1kHz 86

= 0.7V

OUT

RG = open 2

RMS

MAX

RG = 11.11kΩ 19.2 20 20.8Differential Gain A

RG = 1.01kΩ 200

, f = 1kHz 70 dB

P-P

RMS

,

0.75 1.1 mA

1.25 1.5 1.75 V

30

600 kHz

1%

0.05 %

85Power-Supply Rejection Ratio PSRR

mA

nV/√Hz

RMS

V/V

dB

MAX4063

Differential Microphone Preamplifier with

Internal Bias and Complete Shutdown

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3V, GND = 0V, SHDN = V

CC,

INT/AUX = 0V, RG= 11.11kΩ, RL= 100kΩ to 1.5V, R

BIAS

= ∞, V

OUT

is measured between OUT

and OUT. T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1 and 2)

Note 1: All specifications are 100% tested at TA= +25°C. Specification limits over temperature (TA= T

MIN

to T

MAX

) are guaranteed

by design, not production tested.

Note 2: MAX4063 requires a 1µF capacitor from BIAS to ground and a 10pF capacitor from ADJ to OUT.

AUXILIARY INPUT (INT/AUX = VCC)

Small-Signal Bandwidth BW

Input Resistance R

Input Noise-Voltage Density e

RMS Output Noise Voltage V

Total Harmonic Distortion Plus Noise THD+N f = 1kHz, BW = 22Hz to 22kHz 0.007 %

Power-Supply Rejection Ratio PSRR

Voltage Gain A

BIAS OUTPUT

Output Voltage V

Output Resistance R

Output Noise Voltage V

Power-Supply Rejection Ratio PSRR

DIGITAL INPUTS (SHDN and INT/AUX)

Input Leakage Current I

Input Voltage High V

Input Voltage Low V

Shutdown Enable Time t

Shutdown Disable Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

-3dB

IN

f = 1kHz 200 nV/√Hz

n

NRMS

VAUXVOUT

OUTIBIAS

NRMSIBIAS

OFF

BW = 22Hz to 22kHz 620 µV

TA = +25°C 80 100

T

= T

A

OUTIBIAS

I

BIAS

I

BIAS

f = 1kHz

VIN = 0V or V

IN

INH

INL

ON

- T

MIN

MAX

= 0.7V

RMS

= 0.5mA to GND 2 2.2 V
= 0.5mA to GND 16 30 Ω

= 0.5mA to GND, BW = 22Hz to 22kHz 20 µV

= 0.5mA to GND, VCC = 2.4V to 5.5V 60 74

= 0.5mA, VCC = 3V + 100mV

CC

P-P

,

-19.5 -20 -20.5 V/V

0.7 ✕ V

230 kHz
100 kΩ

72

71

CC

0.3 ✕ V

10 µs

10 µs

±1µA

CC

RMS

dB

RMS

dB

V

V

MAX4063

Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 3V, AV= 20V/V, RL≥ 100kΩ to 1.5V, SHDN = VCC, V

OUT

is measured between OUT and OUT. TA= +25°C, unless otherwise

noted.)

GAIN vs. FREQUENCY

(NO LOAD)

VCC = 5V

9

= 2V/V

A

V

6

3

0

GAIN (dB)

-3

-6

-9
10 1M

FREQUENCY (Hz)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

0.9

0.8

0.7

0.6

0.5

0.4

0.3

SUPPLY CURRENT (mA)

0.2

0.1
NO LOAD

0

2.0 5.5
SUPPLY VOLTAGE (V)

100k10k1k100

5.04.53.5 4.03.02.5

0

-20

MAX4063 toc01

-40

-60

PSRR (dB)

-80

-100

-120

-140

100

10

MAX4063 toc04

1

0.1

0.01

SHUTDOWN SUPPLY CURRENT (nA)

0.001

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (DIFF INPUT)

10 1M

SHUTDOWN SUPPLY CURRENT

-40 85

SUPPLY CURRENT vs. TEMPERATURE

1.0

VCC = 5V

0

-40

AV = 20V/V

FREQUENCY (Hz)

AV = 200V/V

100k10k1k100

MAX4063 toc02

SUPPLY CURRENT (mA)

0.8

0.6

0.4

0.2

vs. TEMPERATURE

1000

MAX4063 toc05

100

(mV)

OH

V

10

603510-15

TEMPERATURE (°C)

1

-40 85

VCC = 3V

TEMPERATURE (°C)

VOH vs. TEMPERATURE

I

= 2.5mA

LOAD

I

LOAD

TEMPERATURE (°C)

MAX4063 toc03

NO LOAD

80655035205-10-25

MAX4063 toc06

= 50µA

603510-15

1000

VOL vs. TEMPERATURE

I

= 2.5mA

LOAD

100

(mV)

OL

V

10

I

1

-40 85

TEMPERATURE (°C)

LOAD

= 50µA

603510-15

MAX4063 toc07

VOH vs. LOAD CURRENT

(mV)

OL

V

350

300

250

200

150

100

50

0

400

VOH = V

- V

CC

350

300

250

(mV)

200

OH

V

150

100

50

0

05

OUT

MAX4063 toc08

VCC = 3V

4321

LOAD CURRENT (mA)

VOL vs. LOAD CURRENT

VCC = 3V

LOAD CURRENT (mA)

MAX4063 toc09

432105

MAX4063

Differential Microphone Preamplifier with

Internal Bias and Complete Shutdown

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= 3V, AV= 20V/V, RL≥ 100kΩ to 1.5V, SHDN = VCC, V

OUT

is measured between OUT and OUT. TA= +25°C, unless otherwise

noted.)

10 1k100 10k 100k

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY (DIFF INPUT)

MAX4063 toc10

FREQUENCY (Hz)

THD+N (%)

1

0.001

0.01

0.1

V

OUT

= 4.5V

P-P

5V

3V

10 1k100 10k 100k

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY (AUX INPUT)

MAX4063 toc11

FREQUENCY (Hz)

THD+N (%)

1

0.001

0.01

0.1

V

OUT

= 4.5V

P-P

5V

3V

10

0.001
02146

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE (DIFF INPUT)

0.01

0.1

1

MAX4063 toc12

OUTPUT VOLTAGE (V

P-P

)

THD+N (%)

35

BW = 22Hz TO 22kHz

f = 1kHz

f = 10kHz

10

0.001
02146

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE (DIFF INPUT)

0.01

0.1

1

MAX4063 toc13

OUTPUT VOLTAGE (V

P-P

)

THD+N (%)

35

BW = 22Hz TO 22kHz
V

CC

= 5V

f = 1kHz

f = 10kHz

10

0.001
02146

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE (AUX INPUT)

0.01

0.1

1

MAX4063 toc14

OUTPUT VOLTAGE (V

P-P

)

THD+N (%)

35

BW = 22Hz TO 22kHz
V

CC

= 5V

f = 1kHz

f = 10kHz

10

0.001
02146

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE (AUX INPUT)

0.01

0.1

1

MAX4063 toc15

OUTPUT VOLTAGE (V

P-P

)

THD+N (%)

35

BW = 22Hz TO 22kHz
V

CC

= 5V

f = 1kHz

f = 10kHz

MIC BIAS OUTPUT NOISE

MAX4063 toc17

100ms/div

20µV/div

VCC = 5V
BW = 22Hz TO 22kHz

SMALL-SIGNAL TRANSIENT RESPONSE

FOR DIFF INPUT

MAX4063 toc18

10µs/div

DIFF
INPUT
5mV/div

DIFF
OUTPUT
50mV/div

MAX4063 toc16

FREQUENCY (Hz)

INPUT-REFERRED NOISE (nV/√Hz)

10k1k100

50

100

150

200

250

300

350

400

0

10 100k

INPUT-REFERRED NOISE

vs. FREQUENCY (DIFF INPUT)