MAXIM MAX4465, MAX4469 User Manual

General Description

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 ultra-small packages. 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.

Applications

Microphone Preamplifiers

Hearing Aids

Cellular Phones

Voice-Recognition Systems

Digital Dictation Devices

Headsets

Portable Computing

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 (RL= 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)

MAX4465–MAX4469

Low-Cost, Micropower, SC70/SOT23-8, Microphone

Preamplifiers with Complete Shutdown

________________________________________________________________ Maxim Integrated Products 1

19-1950; Rev 1; 4/01

Ordering Information

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Ordering Information continued at end of data sheet.

TOP VIEW

GND

OUT

IN-

1

5

V

CC

IN+

MAX4465
MAX4466

SC70/SOT23

2

3

4

Pin Configurations

Typical Operating Circuit

Pin Configurations continued at end of data sheet.

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.

PART TEMP. RANGE PIN-PACKAGE

MAX4465EXK-T -40°C to +85°C 5 SC70-5

MAX4465EUK-T -40°C to +85°C 5 SOT23-5

MAX4466EXK-T -40°C to +85°C 5 SC70-5

MAX4466EUK-T -40°C to +85°C 5 SOT23-5

V

CC

MAX4467
MAX4468

SHDN

OUT

R

C

C

BYPASS

BIAS

IN

R

BIAS

C

BIAS

R

IN

R

R

DC

DC

MIC_BIAS

IN+

IN-

GND

MICROPHONE
CAPSULE

MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH
COMPLETE SHUTDOWN

R

FB

MAX4465–MAX4469

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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)................................................+6V

All Other Pins to GND.................................-0.3V to (V

CC

+ 0.3V)

Output Short-Circuit Duration

OUT Shorted to GND or V

CC

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

Continuous Power Dissipation (T

A

= +70°C)

5-Pin SC70 (derate 2.5mW/°C above +70°C) .............200mW

5-Pin SOT23 (derate 7.1mW/°C above +70°C) ...........571mW

8-Pin SOT23 (derate 5.3mW/°C above +70°C) ...........421mW

8-Pin SO (derate 5.88mW/°C above +70°C) ...............471mW

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

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

Junction Temperature......................................................+150°C

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

ELECTRICAL CHARACTERISTICS

(VCC= +5V, VCM= 0, V

OUT

= VCC/2, RL= ∞ to VCC/2, SHDN = GND (MAX4467/MAX4468 only). TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values specified at T

A

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

Supply Current
(Per Amplifier)

Supply Current in Shutdown I

Input Offset Voltage V

Input Bias Current I

Input Offset Current Range I

Input Common-Mode Range V
C om m on- M od e Rej ecti on Rati o CMRR -0.1V ≤ VCM ≤ VCC - 1V 80 126 dB

Open-Loop Gain A

Output Voltage Swing High V

Output Voltage Swing Low V

Output Short-Circuit Current To either supply rail 15 mA

Output Leakage Current
in Shutdown

SHDN Logic Low V

SHDN Logic High V

SHDN Input Current (Note 2) 2 25 nA

Gain Bandwidth Product GBWP

Inferred from PSRR test 2.4 5.5 V

CC

I

SHDN

TA = +25°C2448

CC

TA = T

SHDN = VCC (Note 2) 5 50 nA

OS

VCM = -0.1V ±2.5 ±100 nA

B

VCM = -0.1V ±1 ±15 nA

OS

Inferred from CMRR test -0.1 V

CM

2.4V ≤ V

to T

MIN

MAX

≤ 5.5V 80 112

CC

MAX4465/MAX4467/MAX4469, f = 3.4kHz 75Power-Supply Rejection Ratio PSRR

MAX4466/MAX4468, f = 3.4kHz 80

R

= 100kΩ to VCC/2,

L

0.05V ≤ V

VOL

R

0.1V ≤ V

VCC - V

I

OH

OL

SHDN = VCC, 0 ≤ V

= 10kΩ to V

L

≤ VCC - 0.05V

OUT

CC

≤ VCC - 0.1V

OUT

I

OH

/2,

OUT

(Notes 2, 3)

(Note 2) V

IL

(Note 2) V

IH

MAX4465/MAX4467/MAX4469 200

MAX4466/MAX4468 600

60

±1 ±5mV

- 0.1 V

CC

125

80 95

RL = 100kΩ 10

RL = 10kΩ 16 50

RL = 100kΩ 10

RL = 10kΩ 14 50

≤ V

;

CC

CC

±0.5 ±100 nA

✕

0.3 V

CC

✕

0.7 V

µA

dB

dB

mV

mV

kHz

MAX4465–MAX4469

Low-Cost, Micropower, SC70/SOT23-8, Microphone

Preamplifiers with Complete Shutdown

_______________________________________________________________________________________ 3

Note 1: All specifications are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2: Shutdown mode is available only on the MAX4467/MAX4468.
Note 3: External feedback networks not considered.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V, VCM= 0, V

OUT

= VCC/2, RL= ∞ to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values specified at T

A

= +25°C.) (Note 1)

Typical Operating Characteristics

(VCC= +5V, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise

noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Channel-to-Channel Isolation MAX4469 only, f = 1kHz 85 dB

Phase Margin Ø

Gain Margin R

Slew Rate SR Output step = 4V

Input Noise Voltage Density e

Total Harmonic Distortion THD

Capacitive Load Stability C

SHDN Delay Time t

Enable Delay Time t

Power-On Time t

Bias Switch On-Resistance R

R

M

= 100kΩ 70

L

= 100kΩ 20 dB

L

MAX4465/MAX4467/
MAX4469,
A

= +1

V

MAX4466/MAX4468,
A

= +5

V

f = 1kHz 80 nV/√Hz

n

M AX 4465/M AX 4467/
M AX 4469

MAX4466/MAX4468 0.03

LOAD

SHDN

EN

ON

S

f = 1kHz, R
V

OUT

L

= 2Vp-p

= 10kΩ,

MAX4465/MAX4467/MAX4469, AV = +1 100

MAX4466/MAX4468, AV = +5 100
(Note 2) 1 µs
(Note 2) 50 µs
(Note 2) 40 µs

IS = 5mA (Note 2) 20 500 Ω

45

300

0.02

d egr ees

mV/µs

%

pF

MAX4465/MAX4467/MAX4469

GAIN AND PHASE vs. FREQUENCY (NO LOAD)

140
120
100

80
60
40
20

0

-20

-40

-60

GAIN (dB)/PHASE (DEGREES)

-80

-100

-120

-140

10.1 1k 10k 100k10 100 1M
FREQUENCY (Hz)

MAX4466/MAX4468 GAIN AND PHASE

140
120
100

MAX4465-69 toc01

80
60
40
20

0

-20

-40

-60

-80

GAIN (dB)/PHASE (DEGREES)

-100

-120

-140

-160
1 1k 10k 100k10 100 1M

vs. FREQUENCY (NO LOAD)

MAX4465-69 toc02

GAIN (dB)/PHASE (DEGREES)

FREQUENCY (Hz)

MAX4465/MAX4467/MAX4469

GAIN AND PHASE vs. FREQUENCY (C

140
120
100

80
60
40
20

0

-20

-40

-60

-80

-100

-120

-140

10.1 1k 10k 100k10 100 1M
FREQUENCY (Hz)

= 100pF)

L

MAX4465-69 toc03

MAX4465–MAX4469

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

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= +5V, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise

noted.)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

-10

-30

-50

-70

PSRR (dB)

-90

-110

SHUTDOWN SUPPLY CURRENT

10,000

MAX4465-69 toc04

1000

100

SUPPLY CURRENT (pA)

10

V

= V

SHDN

vs. TEMPERATURE

CC

MAX4465-69 toc05

SUPPLY CURRENT vs. TEMPERATURE

27

26

25

24

SUPPLY CURRENT (µA)

23

MAX4465-69 toc06

-130
10 1k 10k 100k100 1M

FREQUENCY (Hz)

OUTPUT LEAKAGE CURRENT

vs. TEMPERATURE

1000

V

= V

SHDN

CC

V

= VCC/2

OUT

100

(pA)

10

LEAK

I

1

0.1

-40 10-15 356085
TEMPERATURE (°C)

0

-20

MAX4465-69 toc07

-40

-60

-80

CHANNEL-TO-CHANNEL ISOLATION (dB)

-100

OUTPUT VOLTAGE SWING HIGH

vs. TEMPERATURE

5

4

3

(mV)

OUT

- V

DD

2

V

1

0

-40 10-15 35 60 85

TEMPERATURE (°C)

MAX4465-69 toc10

(mV)

SS

- V

OUT

V

1

-40 10-15 35 60 85
TEMPERATURE (°C)

CHANNEL-TO-CHANNEL ISOLATION

vs. FREQUENCY

0.1 1 100 1000

10

FREQUENCY (kHz)

OUTPUT VOLTAGE SWING LOW

vs. TEMPERATURE

5

4

3

2

1

0

-40 10-15 35 60 85

TEMPERATURE (°C)

MAX4465-69 toc08

MAX4465-69 toc11

CMRR (dB)

22

-40 10-15 35 60 85
TEMPERATURE (°C)

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

600

400

200

(µV)

0

OS

V

-200

-400

-600

-40 10-15 35 60 85
TEMPERATURE (°C)

COMMON-MODE REJECTION RATIO

vs. TEMPERATURE

-100

-102

-104

-106

-108

-110

-112

-114

-116

-118

-120

-40 10-15 35 60 85

TEMPERATURE (°C)

MAX4465-69 toc09

MAX4465-69 toc12

MAX4465–MAX4469

Low-Cost, Micropower, SC70/SOT23-8, Microphone

Preamplifiers with Complete Shutdown

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= +5V, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise

noted.)

200µs/div

NONINVERTING LARGE-SIGNAL

TRANSIENT RESPONSE

MAX4465-69 toc21

2V/div

130

125

120

115

110

105

GAIN (dB)

100

95

90

85

80

0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.54.0 5.0

LARGE-SIGNAL GAIN

vs. OUTPUT VOLTAGE

MAX4465/MAX4467/MAX4469

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

100

V

= 2Vp-p

OUT

= +1V/V

A

V

BW = 22kHz

10

LARGE-SIGNAL GAIN

vs. TEMPERATURE

130

MAX4465-69 toc13

125

120

GAIN (dB)

115

110

-40 10-15 35 60 85

V

OUT

(V)

TEMPERATURE (°C)

MAX4465-69 toc14

(V)

V

MAX4466/MAX4468

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

100

V

= 2Vp-p

OUT

AV = +10V/V
BW = 22kHz

10

MAX4465-69 toc16

MAX4465-69 toc17

MINIMUM OPERATING VOLTAGE

vs. TEMPERATURE

1.6

1.5

1.4

1.3

MIN

1.2

1.1

1.0

-40 10-15 35 60 85
TEMPERATURE (°C)

MAX4465/MAX4467/MAX4469

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. INPUT AMPLITUDE

100

f = 1kHz

= +1V/V

A

V

BW = 122kHz

10

MAX4465-69 toc15

MAX4465-69 toc18

1

THD + N (%)

0.1

0.01

0.001
20 2k 20k200

RL = 100k

RL = 10k

Ω

FREQUENCY (Hz)

MAX4466/MAX4468

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. INPUT AMPLITUDE

100

f = 1kHz

= +10V/V

A

V

BW = 22kHz

10

1

THD + N (%)

0.1

0.01

0.001
0 0.05 0.10 0.15 0.20 0.25 0.30

Ω

RL = 10k

RL = 100kΩ

VIN (Vp-p)

1

THD + N (%)

0.1

0.01

0.001
20 2k200 20k

RL = 100k

Ω

FREQUENCY (Hz)

Ω

1

RL = 100k

RL = 10k

Ω

THD + N (%)

0.1

0.01

0.001

0 1.0 1.50.5 2.0

Ω

2.5 3.0

VIN (Vp-p)

RL = 10k

NONINVERTING SMALL-SIGNAL

TRANSIENT RESPONSE

MAX4465-69 toc19

Ω

50mV/div

20µs/div

MAX4465-69 toc20