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19-1950; Rev 1; 4/01
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.
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)
MAX4465–MAX4469
Ordering Information
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 SC70-5
5 SOT23-5
5 SC70-5
5 SOT23-5
MAX4465EXK-T
MAX4465EUK-T
MAX4466EXK-T
MAX4466EUK-T
Applications
Microphone Preamplifiers
Hearing Aids
Cellular Phones
Voice-Recognition Systems
Digital Dictation Devices
Headsets
Portable Computing
Ordering Information continued at end of data sheet.
Typical Operating Circuit
V
CC
SHDN
MIC_BIAS
C
BIAS
R
DC
IN+
OUT
C
IN
R
IN
IN-
Pin Configurations
R
BIAS
TOP VIEW
IN+
1
5
V
CC
R
BIAS
GND
2
MAX4465
MAX4466
4
OUT
IN-
3
C
BYPASS
R
DC
GND
MAX4467
MAX4468
SC70/SOT23
Pin Configurations continued at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
MICROPHONE
CAPSULE
R
FB
MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH
COMPLETE SHUTDOWN
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
MAX4465–MAX4469
ABSOLUTE MAXIMUM RATINGS
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
= +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
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.
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
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
(Per Amplifier)
Supply Current in Shutdown
Input Offset Voltage
Input Bias Current
Input Offset Current Range
Input Common-Mode Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
SYMBOL
V
CC
I
CC
I
SHDN
V
OS
I
B
I
OS
V
CM
CMRR
PSRR
V
CM
= -0.1V
V
CM
= -0.1V
Inferred from CMRR test
-0.1V
≤
V
CM
≤
V
CC
- 1V
2.4V
≤
V
CC
≤
5.5V
MAX4465/MAX4467/MAX4469, f = 3.4kHz
MAX4466/MAX4468, f = 3.4kHz
R
L
= 100kΩ to V
CC
/2,
0.05V
≤
V
OUT
≤
V
CC
- 0.05V
R
L
= 10kΩ to V
CC
/2,
0.1V
≤
V
OUT
≤
V
CC
- 0.1V
80
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 100kΩ
R
L
= 10kΩ
To either supply rail
SHDN = V
CC
, 0
≤
V
OUT
≤
V
CC
;
(Notes 2, 3)
V
IL
V
IH
(Note 2)
(Note 2)
(Note 2)
GBWP
MAX4465/MAX4467/MAX4469
MAX4466/MAX4468
V
CC
✕
0.7
2
200
600
25
-0.1
80
80
126
112
75
80
125
dB
95
10
16
10
14
15
±0.5
±
100
V
CC
✕
0.3
50
50
mV
mV
mA
nA
V
V
nA
kHz
dB
T
A
= +25°C
T
A
= T
MIN
to T
MAX
SHDN = V
CC
(Note 2)
5
±1
±2.5
±
1
CONDITIONS
Inferred from PSRR test
MIN
2.4
24
TYP
MAX
5.5
48
60
50
±
5
±
100
±
15
V
CC
- 0.1
UNITS
V
µA
nA
mV
nA
nA
V
dB
Open-Loop Gain
A
VOL
Output Voltage Swing High
Output Voltage Swing Low
Output Short-Circuit Current
Output Leakage Current
in Shutdown
SHDN Logic Low
SHDN Logic High
SHDN Input Current
Gain Bandwidth Product
V
OH
V
OL
I
V
CC
- V
OH
I
2
_______________________________________________________________________________________
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
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
= +25°C.) (Note 1)
PARAMETER
Channel-to-Channel Isolation
Phase Margin
Gain Margin
Ø
M
SYMBOL
CONDITIONS
MAX4469 only, f = 1kHz
R
L
= 100kΩ
R
L
= 100kΩ
MAX4465/MAX4467/
MAX4469,
A
V
= +1
MAX4466/MAX4468,
A
V
= +5
Input Noise Voltage Density
Total Harmonic Distortion
e
n
THD
f = 1kHz
f = 1kHz, R
L
= 10kΩ,
V
OUT
= 2Vp-p
MAX4465/MAX4467/
MAX4469
MAX4466/MAX4468
MIN
TYP
85
70
20
45
mV/µs
300
80
0.02
0.03
100
100
1
50
40
20
500
µs
µs
µs
Ω
pF
nV/√Hz
%
MAX
UNITS
dB
degrees
dB
MAX4465–MAX4469
Slew Rate
SR
Output step = 4V
Capacitive Load Stability
SHDN Delay Time
Enable Delay Time
Power-On Time
Bias Switch On-Resistance
C
LOAD
t
SHDN
t
EN
t
ON
R
S
MAX4465/MAX4467/MAX4469, A
V
= +1
MAX4466/MAX4468, A
V
= +5
(Note 2)
(Note 2)
(Note 2)
I
S
= 5mA (Note 2)
Note 1:
All specifications are 100% production tested at T
A
= +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.
Typical Operating Characteristics
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only), T
A
= +25°C, unless otherwise
noted.)
MAX4465/MAX4467/MAX4469
GAIN AND PHASE vs. FREQUENCY (NO LOAD)
140
120
100
80
60
40
20
0
-20
-40
-60
-80
-100
-120
-140
0.1
1
10
100
1k
10k 100k
FREQUENCY (Hz)
140
120
100
80
60
40
20
0
-20
-40
-60
-80
-100
-120
-140
-160
1
10
100
1k
10k
100k
FREQUENCY (Hz)
MAX4465-69 toc01
MAX4466/MAX4468 GAIN AND PHASE
vs. FREQUENCY (NO LOAD)
MAX4465-69 toc02
MAX4465/MAX4467/MAX4469
GAIN AND PHASE vs. FREQUENCY (C
L
= 100pF)
140
120
100
80
60
40
20
0
-20
-40
-60
-80
-100
-120
-140
0.1
1
10
100
1k
10k 100k
FREQUENCY (Hz)
MAX4465-69 toc03
GAIN (dB)/PHASE (DEGREES)
GAIN (dB)/PHASE (DEGREES)
GAIN (dB)/PHASE (DEGREES)
1M
1M
1M
_______________________________________________________________________________________
3
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
MAX4465–MAX4469
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, SHDN = GND (MAX4467/MAX4468 only), T
A
= +25°C, unless otherwise
noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4465-69 toc04
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4465-69 toc05
SUPPLY CURRENT vs. TEMPERATURE
MAX4465-69 toc06
10,000
-10
-30
-50
-70
-90
-110
-130
10
100
1k
10k
100k
V
SHDN
= V
CC
27
SUPPLY CURRENT (pA)
SUPPLY CURRENT (µA)
-40
-15
10
35
60
85
1000
26
PSRR (dB)
25
100
24
10
23
1
1M
FREQUENCY (Hz)
TEMPERATURE (°C)
22
-40
-15
10
35
60
85
TEMPERATURE (°C)
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE
CHANNEL-TO-CHANNEL ISOLATION (dB)
V
SHDN
= V
CC
V
OUT
= V
CC
/2
MAX4465-69 toc07
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
MAX4465-69 toc08
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4465-69 toc09
1000
0
600
400
200
V
OS
(µV)
-20
100
I
LEAK
(pA)
-40
10
0
-200
-60
1
-80
-400
-600
0.1
1
10
FREQUENCY (kHz)
100
1000
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.1
-40
-15
10
35
60
85
TEMPERATURE (°C)
-100
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
MAX4465-69 toc10
OUTPUT VOLTAGE SWING LOW
vs. TEMPERATURE
MAX4465-69 toc11
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
-102
-104
-106
MAX4465-69 toc12
5
5
-100
4
V
DD
- V
OUT
(mV)
4
V
OUT
- V
SS
(mV)
3
3
CMRR (dB)
-108
-110
-112
-114
2
2
1
1
-116
-118
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
-120
-40
-15
10
35
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
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