General Description
The MAX4465MAX4469 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 24A 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
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
= 100k
)
o Rail-to-Rail Outputs
o Low 24A 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)
MAX4465MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
________________________________________________________________ Maxim Integrated Products
1
19-1950; Rev 1; 4/01
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX4465EXK-T
-40C to +85C
5 SC70-5
MAX4465EUK-T
-40C to +85C
5 SOT23-5
MAX4466EXK-T
-40C to +85C
5 SC70-5
MAX4466EUK-T
-40C to +85C
5 SOT23-5
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
MAX4467
MAX4468
GND
MICROPHONE
CAPSULE
MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH
COMPLETE SHUTDOWN
R
BIAS
R
FB
V
CC
OUT
IN+
IN-
SHDN
C
BIAS
R
BIAS
R
DC
MIC_BIAS
R
IN
C
IN
C
BYPASS
R
DC
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.
MAX4465MAX4469
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 (V
CC
to 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
= +70C)
5-Pin SC70 (derate 2.5mW/C above +70C) .............200mW
5-Pin SOT23 (derate 7.1mW/C above +70C) ...........571mW
8-Pin SOT23 (derate 5.3mW/C above +70C) ...........421mW
8-Pin SO (derate 5.88mW/C above +70C) ...............471mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Junction Temperature ......................................................+150C
Lead Temperature (soldering, 10s) .................................+300C
ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
=
to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only). T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values specified at T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
CC
Inferred from PSRR test
2.4
5.5
V
T
A
= +25
C
24
48
Supply Current
(Per Amplifier)
I
CC
T
A
= T
MIN
to T
MAX
60
A
Supply Current in Shutdown
I
SHDN
SHDN = V
CC
(Note 2)
5
50
nA
Input Offset Voltage
V
OS
1
5
mV
Input Bias Current
I
B
V
CM
= -0.1V
2.5
100
nA
Input Offset Current Range
I
OS
V
CM
= -0.1V
1
15
nA
Input Common-Mode Range
V
CM
Inferred from CMRR test
-0.1
V
CC
- 0.1
V
C om m on- M od e Rej ecti on Rati o
CMRR
-0.1V
V
CM
V
CC
- 1V
80
126
dB
2.4V
V
CC
5.5V
80
112
MAX4465/MAX4467/MAX4469, f = 3.4kHz
75
Power-Supply Rejection Ratio
PSRR
MAX4466/MAX4468, f = 3.4kHz
80
dB
R
L
= 100k
to V
CC
/2,
0.05V
V
OUT
V
CC
- 0.05V
125
Open-Loop Gain
A
VOL
R
L
= 10k
to V
CC
/2,
0.1V
V
OUT
V
CC
- 0.1V
80
95
dB
R
L
= 100k
10
Output Voltage Swing High
V
OH
I
V
CC
- V
OH
I
R
L
= 10k
16
50
mV
R
L
= 100k
10
Output Voltage Swing Low
V
OL
R
L
= 10k
14
50
mV
Output Short-Circuit Current
To either supply rail
15
mA
Output Leakage Current
in Shutdown
SHDN = V
CC
, 0
V
OUT
V
CC
;
(Notes 2, 3)
0.5
100
nA
SHDN Logic Low
V
IL
(Note 2)
V
CC
0.3
V
SHDN Logic High
V
IH
(Note 2)
V
CC
0.7
V
SHDN Input Current
(Note 2)
2
25
nA
MAX4465/MAX4467/MAX4469
200
Gain Bandwidth Product
GBWP
MAX4466/MAX4468
600
kHz
MAX4465MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
_______________________________________________________________________________________
3
-140
-120
-100
-80
-60
-40
-20
0
20
40
60
80
100
120
140
MAX4465/MAX4467/MAX4469
GAIN AND PHASE vs. FREQUENCY (NO LOAD)
FREQUENCY (Hz)
1
0.1
1k
10k 100k
10
100
1M
GAIN (dB)/PHASE (DEGREES)
MAX4465-69 toc01
-160
-140
-120
-100
-80
-60
-40
0
-20
20
40
60
80
100
120
140
MAX4466/MAX4468 GAIN AND PHASE
vs. FREQUENCY (NO LOAD)
FREQUENCY (Hz)
GAIN (dB)/PHASE (DEGREES)
MAX4465-69 toc02
1
1k
10k
100k
10
100
1M
-140
-120
-100
-80
-60
-40
-20
0
20
40
60
80
100
120
140
MAX4465/MAX4467/MAX4469
GAIN AND PHASE vs. FREQUENCY (C
L
= 100pF)
FREQUENCY (Hz)
1
0.1
1k
10k 100k
10
100
1M
GAIN (dB)/PHASE (DEGREES)
MAX4465-69 toc03
Note 1: All specifications are 100% production tested at T
A
= +25C. 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)
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
=
to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only), T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values specified at T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Channel-to-Channel Isolation
MAX4469 only, f = 1kHz
85
dB
Phase Margin
M
R
L
= 100k
70
d egr ees
Gain Margin
R
L
= 100k
20
dB
MAX4465/MAX4467/
MAX4469,
A
V
= +1
45
Slew Rate
SR
Output step = 4V
MAX4466/MAX4468,
A
V
= +5
300
mV/
s
Input Noise Voltage Density
e
n
f = 1kHz
80
nV/
Hz
M AX 4465/M AX 4467/
M AX 4469
0.02
Total Harmonic Distortion
THD
f = 1kHz, R
L
= 10k
,
V
OUT
= 2Vp-p
MAX4466/MAX4468
0.03
%
MAX4465/MAX4467/MAX4469, A
V
= +1
100
Capacitive Load Stability
C
LOAD
MAX4466/MAX4468, A
V
= +5
100
pF
SHDN Delay Time
t
SHDN
(Note 2)
1
s
Enable Delay Time
t
EN
(Note 2)
50
s
Power-On Time
t
ON
(Note 2)
40
s
Bias Switch On-Resistance
R
S
I
S
= 5mA (Note 2)
20
500
Typical Operating Characteristics
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100k
to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only), T
A
= +25C, unless otherwise
noted.)
MAX4465MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
4
_______________________________________________________________________________________
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
FREQUENCY (Hz)
10
1k
10k
100k
100
1M
PSRR (dB)
-10
-130
-110
-90
-70
-50
-30
MAX4465-69 toc04
10,000
1000
100
10
1
-40
10
-15
35
60
85
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4465-69 toc05
TEMPERATURE (
C)
SUPPLY CURRENT (pA)
V
SHDN
= V
CC
22
23
25
24
26
27
-40
10
-15
35
60
85
SUPPLY CURRENT vs. TEMPERATURE
MAX4465-69 toc06
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
1000
100
10
1
0.1
-40
10
-15
35
60
85
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE
MAX4465-69 toc07
TEMPERATURE (
C)
I
LEAK
(pA)
V
SHDN
= V
CC
V
OUT
= V
CC
/2
0
-100
0.1
1
100
1000
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
-80
-60
-40
-20
MAX4465-69 toc08
FREQUENCY (kHz)
CHANNEL-TO-CHANNEL ISOLATION (dB)
10
-600
-200
-400
200
0
400
600
-40
10
-15
35
60
85
MAX4465-69 toc09
TEMPERATURE (
C)
V
OS
(
V)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
0
1
3
2
4
5
-40
10
-15
35
60
85
MAX4465-69 toc10
TEMPERATURE (
C)
V
DD
- V
OUT
(mV)
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
0
1
3
2
4
5
-40
10
-15
35
60
85
MAX4465-69 toc11
TEMPERATURE (
C)
V
OUT
- V
SS
(mV)
OUTPUT VOLTAGE SWING LOW
vs. TEMPERATURE
-120
-114
-116
-118
-112
-110
-108
-106
-104
-102
-100
-40
10
-15
35
60
85
MAX4465-69 toc12
TEMPERATURE (
C)
CMRR (dB)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100k
to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only), T
A
= +25C, unless otherwise
noted.)
MAX4465MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
_______________________________________________________________________________________
5
80
90
85
100
95
110
105
115
125
120
130
0
1.0 1.5 2.0
0.5
2.5 3.0 3.5
4.5
4.0
5.0
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAX4465-69 toc13
V
OUT
(V)
GAIN (dB)
-40
10
-15
35
60
85
MAX4465-69 toc14
TEMPERATURE (
C)
GAIN (dB)
LARGE-SIGNAL GAIN
vs. TEMPERATURE
130
125
120
115
110
1.0
1.2
1.1
1.4
1.3
1.5
1.6
-40
10
-15
35
60
85
MAX4465-69 toc15
TEMPERATURE (
C)
V
MIN
(V)
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
100
10
1
0.1
0.01
0.001
20
2k
20k
200
MAX4465/MAX4467/MAX4469
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4465-69 toc16
FREQUENCY (Hz)
THD + N (%)
V
OUT
= 2Vp-p
A
V
= +1V/V
BW = 22kHz
R
L
= 100k
R
L
= 10k
100
10
MAX4465-69 toc17
FREQUENCY (Hz)
THD + N (%)
1
0.1
0.01
0.001
20
2k
200
20k
VOUT = 2Vp-p
AV = +10V/V
BW = 22kHz
R
L
= 10k
R
L
= 100k
MAX4466/MAX4468
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
100
10
1
0.1
0.01
0
1.0
1.5
0.5
2.0
THD + N (%)
f = 1kHz
A
V
= +1V/V
BW = 122kHz
0.001
MAX4465/MAX4467/MAX4469
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT AMPLITUDE
MAX4465-69 toc18
V
IN
(Vp-p)
2.5
3.0
R
L
= 10k
R
L
= 100k
100
0
0.05
0.10
0.15
0.20
0.25
0.30
10
1
0.1
0.01
0.001
MAX4465-69 toc19
V
IN
(Vp-p)
THD + N (%)
f = 1kHz
A
V
= +10V/V
BW = 22kHz
MAX4466/MAX4468
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT AMPLITUDE
R
L
= 10k
R
L
= 100k
20
s/div
NONINVERTING SMALL-SIGNAL
TRANSIENT RESPONSE
MAX4465-69 toc20
50mV/div
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100k
to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only), T
A
= +25C, unless otherwise
noted.)
200
s/div
NONINVERTING LARGE-SIGNAL
TRANSIENT RESPONSE
MAX4465-69 toc21
2V/div
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