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General Description
The MAX7409/MAX7410/MAX7413/MAX7414 5th-order,
lowpass, switched-capacitor filters (SCFs) operate from
a single +5V (MAX7409/MAX7410) or +3V (MAX7413/
MAX7414) supply. These devices draw only 1.2mA of
supply current and allow corner frequencies from 1Hz
to 15kHz, making them ideal for low-power post-DAC
filtering and anti-aliasing applications. They feature a
shutdown mode, which reduces the supply current to
0.2µA.
Two clocking options are available on these devices:
self-clocking (through the use of an external capacitor)
or external clocking for tighter corner-frequency control.
An offset adjust pin allows for adjustment of the DC out-
put level.
The MAX7409/MAX7413 Bessel filters provide low over-
shoot and fast settling, while the MAX7410/MAX7414
Butterworth filters provide a maximally flat passband
response. Their fixed response simplifies the design
task to selecting a clock frequency.
Applications
ADC Anti-Aliasing
CT2 Base Stations
DAC Postfiltering
Speech Processing
Air-Bag Electronics
Features
o
5th-Order Lowpass Filters
Bessel Response (MAX7409/MAX7413)
Butterworth Response (MAX7410/MAX7414)
o
Clock-Tunable Corner Frequency (1Hz to 15kHz)
o
Single-Supply Operation
+5V (MAX7409/MAX7410)
+3V (MAX7413/MAX7414)
o
Low Power
1.2mA (operating mode)
0.2µA (shutdown mode)
o
Available in 8-Pin µMAX/DIP Packages
o
Low Output Offset: ±4mV
MAX7409/MAX7410/MAX7413/MAX7414
5th-Order, Lowpass,
Switched-Capacitor Filters
________________________________________________________________
Maxim Integrated Products
1
OS
OUT
V
DD
1
2
8
7
CLK
SHDN
IN
GND
COM
µ
MAX/DIP
TOP VIEW
3
4
6
5
MAX7409
MAX7410
MAX7413
MAX7414
V
DD
IN
CLK
OUT
GND
INPUT
0.1
µ
F
0.1
µ
F
CLOCK
SHDN
OUTPUT
V
SUPPLY
COM
OS
MAX7409
MAX7410
MAX7413
MAX7414
Typical Operating Circuit
19-4766; Rev 1; 9/98
Pin Configuration
Ordering Information
PART
FILTER RESPONSE
OPERATING
VOLTAGE (V)
MAX7409
Bessel
+5
MAX7410
Butterworth
+5
Selector Guide
PART
MAX7409CPA
MAX7409EUA
MAX7409EPA
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
8 Plastic DIP
8 µMAX
8 Plastic DIP
MAX7410
CUA
MAX7410CPA
MAX7410EUA
MAX7410EPA
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
Ordering Information continued at end of data sheet.
MAX7413
Bessel
+3
MAX7414
Butterworth
+3
MAX7409
CUA
0°C to +70°C
8 µMAX
MAX7409/MAX7410/MAX7413/MAX7414
5th-Order, Lowpass,
Switched-Capacitor Filters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--MAX7409/MAX7410
(V
DD
= +5V, filter output measured at OUT, 10k
|| 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,
SHDN = V
DD
, f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
V
DD
to GND ..............................................................-0.3V to +6V
IN, OUT, COM, OS, CLK, SHDN ................-0.3V to (V
DD
+ 0.3V)
OUT Short-Circuit Duration...................................................1sec
Continuous Power Dissipation (T
A
= +70°C)
8-Pin DIP (derate 9.09mW/°C above +70°C) ...............727mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
Operating Temperature Ranges
MAX74 _ _C_A ...................................................0°C to +70°C
MAX74 _ _E_A ................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
C
OSC
= 1000pF (Note 3)
V
OS
= 0 to V
DD
SHDN = GND, V
COM
= 0 to V
DD
(Note 1)
Input, COM externally driven
OS to OUT
Input, OS externally driven
f
IN
= 200Hz, V
IN
= 4Vp-p,
measurement bandwidth = 22kHz
V
IN
= V
COM
= V
DD
/ 2
V
COM
= V
DD
/ 2 (Note 2)
Output, COM unconnected
CONDITIONS
21
30
38
f
OSC
Internal Oscillator Frequency
±0.1
±10
Input Leakage Current at OS
±0.1
±10
Input Leakage Current at COM
50
500
C
L
10
1
R
L
Resistive Output Load Drive
5
Clock Feedthrough
110
180
R
COM
Input Resistance at COM
V
COM
±0.1
V
OS
2.3
2.5
2.7
100:1
f
CLK
/ f
c
Clock-to-Corner Ratio
0.001 to 15
fc
Corner Frequency
V
COM
1
A
OS
Offset Voltage Gain
-85
THD+N
Total Harmonic Distortion
plus Noise
10
Clock-to-Corner Tempco
0.25
V
DD -
0.25
Output Voltage Range
±4
±25
V
OFFSET
Output Offset Voltage
-0.2
0
0.2
DC Insertion Gain with
Output Offset Removed
MIN
TYP
MAX
SYMBOL
PARAMETER
V
CLK
= 0 or 5V
0.5
V
IL
Clock Input Low
4.5
V
IH
Clock Input High
±13.5
±20
I
CLK
Clock Output Current
(Internal Oscillator Mode)
V
V
µA
kHz
µA
µA
pF
k
mVp-p
k
V
V
V/V
dB
dB
mV
V
ppm/°C
kHz
UNITS
Maximum Capacitive Output
Load Drive
FILTER CHARACTERISTICS
CLOCK
MAX7409
MAX7410
-78
COM Voltage Range
2.0
2.5
3.0
Input Voltage Range at OS
MAX7409/MAX7410/MAX7413/MAX7414
5th-Order, Lowpass,
Switched-Capacitor Filters
_______________________________________________________________________________________
3
5th-Order, Lowpass,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS--MAX7409/MAX7410
(V
DD
= +5V, filter output measured at OUT, 10k
|| 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,
SHDN = V
DD
, f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS--MAX7413/MAX7414
(V
DD
= +3V, filter output measured at OUT pin, 10k
|| 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,
SHDN = V
DD
, f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
CONDITIONS
MIN
TYP
MAX
SYMBOL
PARAMETER
IN = COM (Note 4)
SHDN = GND
Operating mode, no load
0.5
V
SDL
SHDN Input Low
4.5
V
SDH
SHDN Input High
70
PSRR
Power-Supply Rejection Ratio
0.2
1
I
SHDN
Shutdown Current
1.2
1.5
Supply Current
I
DD
4.5
5.5
V
DD
Supply Voltage
V
V
dB
µA
mA
V
UNITS
SHDN Input Leakage Current
V
SHDN
= 0 to V
DD
±0.2
±10
µA
POWER REQUIREMENTS
SHUTDOWN
µA
±0.1
±10
V
OS
= 0 to V
DD
Input Leakage Current at OS
µA
±0.1
±10
SHDN = GND, V
COM
= 0 to V
DD
Input Leakage Current at COM
Maximum Capacitive Output
Load Drive
UNITS
kHz
ppm/°C
V
mV
dB
dB
V/V
V
V
mVp-p
k
pF
PARAMETER
SYMBOL
MIN
TYP
MAX
DC Insertion Gain with
Output Offset Removed
-0.2
0
+0.2
Output Offset Voltage
V
OFFSET
±4
±25
Output Voltage Range
0.25
V
DD -
0.25
Clock-to-Corner Tempco
10
Total Harmonic Distortion
plus Noise
THD+N
-83
Offset Voltage Gain
A
OS
1
Corner Frequency
f
C
0.001 to 15
Clock-to-Corner Ratio
f
CLK /
f
C
100:1
COM Voltage Range
V
COM
1.4
1.5
1.6
V
COM
±0.1
Clock Feedthrough
3
Resistance Output Load Drive
R
L
10
1
C
L
50
500
CONDITIONS
V
COM
= V
DD
/ 2 (Note 2)
V
IN
= V
COM
= V
DD
/ 2
f
IN
= 200Hz, V
IN
= 2.5Vp-p,
measurement bandwidth = 22kHz
Input, COM externally driven
OS to OUT
Input, OS externally driven
(Note 1)
1.4
1.5
1.6
k
Input Resistance at COM
R
COM
110
180
Input Voltage Range at OS
V
OS
MAX7413
MAX7414
-81
FILTER CHARACTERISTICS
V
Output, COM unconnected
MAX7409/MAX7410/MAX7413/MAX7414
5th-Order, Lowpass,
Switched-Capacitor Filters
4
_______________________________________________________________________________________
C
OSC
= 1000pF (Note 3)
CONDITIONS
21
30
38
f
OSC
Internal Oscillator Frequency
MIN
TYP
MAX
SYMBOL
PARAMETER
IN = COM (Note 4)
SHDN = GND
Operating mode, no load
V
CLK
= 0 or 3V
0.5
V
SDL
SHDN Input Low
2.5
V
SDH
SHDN Input High
70
PSRR
Power-Supply Rejection Ratio
0.2
1
I
SHDN
Shutdown Current
1.2
1.5
2.7
3.6
V
DD
Supply Voltage
0.5
V
IL
Clock Input Low
2.5
V
IH
Clock Input High
±13.5
±20
I
CLK
Clock Output Current
(Internal Oscillator Mode)
V
V
dB
µA
V
V
V
µA
kHz
UNITS
SHDN Input Leakage Current
V
SHDN
= 0 to V
DD
0.2
±10
µA
FILTER CHARACTERISTICS
(V
DD
= +5V for MAX7409/MAX7410, V
DD
= +3V for MAX7413/MAX7414, filter output measured at OUT, 10k
||
50pF load to GND at
OUT, SHDN = V
DD
, f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Note 1:
The maximum f
C
is defined as the clock frequency f
CLK
= 100 x f
C
at which the peak S / (THD+N) drops to 68dB with a
sinusoidal input at 0.2f
C
.
Note 2:
DC insertion gain is defined as
V
OUT
/
V
IN
.
Note 3:
f
OSC
(kHz)
30 x 10
3
/ C
OSC
(pF).
Note 4:
PSRR is the change in output voltage from a V
DD
of 4.5V and a V
DD
of 5.5V.
CLOCK
POWER REQUIREMENTS
SHUTDOWN
CONDITIONS
UNITS
MIN
TYP
MAX
PARAMETER
mA
I
DD
Supply Current
ELECTRICAL CHARACTERISTICS--MAX7413/MAX7414 (continued)
(V
DD
= +3V, filter output measured at OUT pin, 10k
|| 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,
SHDN = V
DD
, f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
f
IN
= 0.5f
C
-1
-0.74
f
IN
= f
C
-3.6
-3.0
-2.4
f
IN
= 4f
C
-41.0
-35
f
IN
= 7f
C
dB
-64.3
-58
f
IN
= 0.5f
C
dB
-0.3
0
f
IN
= 3f
C
f
IN
= f
C
-3.6
-3.0
-2.4
Insertion Gain Relative to
DC Gain
-47.5
-43
f
IN
= 5f
C
-70
-65
Insertion Gain Relative to
DC Gain
BESSEL FILTERS--MAX7409/MAX7413
BUTTERWORTH FILTERS--MAX7410/MAX7414
MAX7409/MAX7410/MAX7413/MAX7414
5th-Order, Lowpass,
Switched-Capacitor Filters
_______________________________________________________________________________________
5
-56
-40
-48
-32
-8
0
-16
-24
8
0
1.0 1.5 2.0 2.5
0.5
3.0 3.5 4.0 4.5 5.0
MAX7409/MAX7413
FREQUENCY RESPONSE
(BESSEL)
MAX7409 toc01
INPUT FREQUENCY (kHz)
GAIN (dB)
f
C
= 1kHz
-70
-50
-60
-40
-10
0
-20
-30
10
0
1.0 1.5 2.0 2.5
0.5
3.0 3.5 4.0 4.5 5.0
MAX7410/MAX7414
FREQUENCY RESPONSE
(BUTTERWORTH)
MAX7409 toc02
INPUT FREQUENCY (kHz)
GAIN (dB)
f
C
= 1kHz
-250
-200
-100
-150
-50
0
0
0.4
0.6
0.2
0.8
1.0
1.2
1.4
1.6
MAX7409/MAX7413
PHASE RESPONSE
(BESSEL)
MAX7409 toc05
INPUT FREQUENCY (kHz)
PHASE SHIFT (DEGREES)
f
C
= 1kHz
-350
-300
-200
-250
-100
-50
-150
0
0
0.4
0.6
0.2
0.8
1.0
1.2
1.4
1.6
MAX7410/MAX7414
PHASE RESPONSE
(BUTTERWORTH)
MAX7409 toc06
INPUT FREQUENCY (kHz)
PHASE SHIFT (DEGREES)
f
C
= 1kHz
-3.2
-2.4
-3.0
-2.0
-0.8
-0.4
-1.2
-1.6
0
0
204 306 408 510
102
612 714 816 918 1.02k
MAX7409/MAX7413
PASSBAND FREQUENCY RESPONSE
(BESSEL)
MAX7409 toc03
INPUT FREQUENCY (Hz)
GAIN (dB)
f
C
= 1kHz
-3.5
-2.5
-3.0
-2.0
-0.5
0
-1.0
-1.5
0.5
0
204 306 408 510
102
612 714 816 918 1.02k
MAX7410/MAX7414
PASSBAND FREQUENCY RESPONSE
(BUTTERWORTH)
MAX7409 toc04
INPUT FREQUENCY (Hz)
GAIN (dB)
f
C
= 1kHz
1.11
1.12
1.13
1.14
1.15
1.16
1.17
1.18
1.19
2.5
3.5
3.0
4.0
4.5
5.0
5.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7409 toc07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
Typical Operating Characteristics
(V
DD
= +5V for MAX7409/MAX7410, V
DD
= +3V for MAX7413/MAX7414, f
CLK
= 100kHz, SHDN = V
DD
, COM = OS = V
DD
/ 2, T
A
= +25°C,
unless otherwise noted.)
LABEL
f
IN
(Hz)
f
C
(kHz)
A
200
1
B
1k
5
f
CLK
(kHz)
100
500
MEASUREMENT
BANDWIDTH (kHz)
22
80
Table A. THD+N vs. Input Signal
Amplitude Plot Characteristics
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