19-4766; Rev 1; 9/98
5th-Order, Lowpass,
Switched-Capacitor Filters
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.
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
Ordering Information
PART
MAX7409CUA
MAX7409CPA
MAX7409EUA
MAX7409EPA
MAX7410CUA
MAX7410CPA
MAX7410EUA
MAX7410EPA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
Applications
ADC Anti-Aliasing
DAC Postfiltering
Air-Bag Electronics
CT2 Base Stations
Speech Processing
Selector Guide
PART
MAX7409
MAX7410
MAX7413
MAX7414
FILTER RESPONSE
Bessel
Butterworth
Bessel
Butterworth
OPERATING
VOLTAGE (V)
+5
+5
+3
+3
Ordering Information continued at end of data sheet.
Typical Operating Circuit
V
SUPPLY
Pin Configuration
TOP VIEW
0.1µF
V
DD
INPUT
IN
SHDN
OUT
OUTPUT
COM
IN
GND
1
2
3
8
7
CLK
SHDN
OS
OUT
CLOCK
CLK
V
DD
4
MAX7409
MAX7410
MAX7413
MAX7414
µMAX/DIP
6
5
MAX7409
MAX7410
MAX7413
MAX7414
GND
COM
OS
0.1µF
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
5th-Order, Lowpass,
Switched-Capacitor Filters
MAX7409/MAX7410/MAX7413/MAX7414
ABSOLUTE MAXIMUM RATINGS
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
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—MAX7409/MAX7410
(V
DD
= +5V, filter output measured at OUT, 10kΩ || 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.)
PARAMETER
FILTER CHARACTERISTICS
Corner Frequency
Clock-to-Corner Ratio
Clock-to-Corner Tempco
Output Voltage Range
Output Offset Voltage
DC Insertion Gain with
Output Offset Removed
Total Harmonic Distortion
plus Noise
Offset Voltage Gain
COM Voltage Range
Input Voltage Range at OS
Input Resistance at COM
Clock Feedthrough
Resistive Output Load Drive
Maximum Capacitive Output
Load Drive
Input Leakage Current at COM
Input Leakage Current at OS
CLOCK
Internal Oscillator Frequency
Clock Output Current
(Internal Oscillator Mode)
Clock Input High
Clock Input Low
f
OSC
I
CLK
V
IH
V
IL
C
OSC
= 1000pF (Note 3)
V
CLK
= 0 or 5V
4.5
0.5
21
30
±13.5
38
±20
kHz
µA
V
V
R
L
C
L
SHDN
= GND, V
COM
= 0 to V
DD
V
OS
= 0 to V
DD
10
50
THD+N
A
OS
V
COM
V
OS
R
COM
V
OFFSET
V
IN
= V
COM
= V
DD
/ 2
V
COM
= V
DD
/ 2 (Note 2)
f
IN
= 200Hz, V
IN
= 4Vp-p,
measurement bandwidth = 22kHz
OS to OUT
Input, COM externally driven
Output, COM unconnected
Input, OS externally driven
110
2.0
2.3
MAX7409
MAX7410
-0.2
0.25
±4
0
-85
-78
1
2.5
2.5
V
COM
±0.1
180
5
1
500
±0.1
±0.1
±10
±10
3.0
2.7
fc
f
CLK
/ f
c
(Note 1)
0.001 to 15
100:1
10
V
DD -
0.25
±25
0.2
ppm/°C
V
mV
dB
dB
V/V
V
V
kΩ
mVp-p
kΩ
pF
µA
µA
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
5th-Order, Lowpass,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS—MAX7409/MAX7410
(V
DD
= +5V, filter output measured at OUT, 10kΩ || 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.)
PARAMETER
POWER REQUIREMENTS
Supply Voltage
Supply Current
Shutdown Current
Power-Supply Rejection Ratio
SHUTDOWN
SHDN
Input High
SHDN
Input Low
SHDN
Input Leakage Current
V
SDH
V
SDL
V
SHDN
= 0 to V
DD
±0.2
4.5
0.5
±10
V
V
µA
V
DD
I
DD
I
SHDN
PSRR
Operating mode, no load
SHDN
= GND
IN = COM (Note 4)
4.5
1.2
0.2
70
5.5
1.5
1
V
mA
µA
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX7409/MAX7410/MAX7413/MAX7414
ELECTRICAL CHARACTERISTICS—MAX7413/MAX7414
(V
DD
= +3V, filter output measured at OUT pin, 10kΩ || 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.)
PARAMETER
FILTER CHARACTERISTICS
Corner Frequency
Clock-to-Corner Ratio
Clock-to-Corner Tempco
Output Voltage Range
Output Offset Voltage
DC Insertion Gain with
Output Offset Removed
Total Harmonic Distortion
plus Noise
Offset Voltage Gain
COM Voltage Range
Input Voltage Range at OS
Input Resistance at COM
Clock Feedthrough
Resistance Output Load Drive
Maximum Capacitive Output
Load Drive
Input Leakage Current at COM
Input Leakage Current at OS
R
L
C
L
SHDN
= GND, V
COM
= 0 to V
DD
V
OS
= 0 to V
DD
10
50
THD+N
A
OS
V
COM
V
OS
R
COM
V
OFFSET
V
IN
= V
COM
= V
DD
/ 2
V
COM
= V
DD
/ 2 (Note 2)
f
IN
= 200Hz, V
IN
= 2.5Vp-p,
measurement bandwidth = 22kHz
OS to OUT
Input, COM externally driven
Output, COM unconnected
Input, OS externally driven
110
1.4
1.4
MAX7413
MAX7414
-0.2
0.25
±4
0
-83
-81
1
1.5
1.5
V
COM
±0.1
180
3
1
500
±0.1
±0.1
±10
±10
1.6
1.6
f
C
f
CLK /
f
C
(Note 1)
0.001 to 15
100:1
10
V
DD -
0.25
±25
+0.2
ppm/°C
V
mV
dB
dB
V/V
V
V
V
kΩ
mVp-p
kΩ
pF
µA
µA
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
5th-Order, Lowpass,
Switched-Capacitor Filters
MAX7409/MAX7410/MAX7413/MAX7414
ELECTRICAL CHARACTERISTICS—MAX7413/MAX7414 (continued)
(V
DD
= +3V, filter output measured at OUT pin, 10kΩ || 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.)
PARAMETER
CLOCK
Internal Oscillator Frequency
Clock Output Current
(Internal Oscillator Mode)
Clock Input High
Clock Input Low
POWER REQUIREMENTS
Supply Voltage
Supply Current
Shutdown Current
Power-Supply Rejection Ratio
SHUTDOWN
SHDN
Input High
SHDN
Input Low
SHDN
Input Leakage Current
V
SDH
V
SDL
V
SHDN
= 0 to V
DD
0.2
2.5
0.5
±10
V
V
µA
V
DD
I
DD
I
SHDN
PSRR
Operating mode, no load
SHDN
= GND
IN = COM (Note 4)
2.7
1.2
0.2
70
3.6
1.5
1
V
mA
µA
dB
f
OSC
I
CLK
V
IH
V
IL
C
OSC
= 1000pF (Note 3)
V
CLK
= 0 or 3V
2.5
0.5
21
30
±13.5
38
±20
kHz
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FILTER CHARACTERISTICS
(V
DD
= +5V for MAX7409/MAX7410, V
DD
= +3V for MAX7413/MAX7414, filter output measured at OUT, 10kΩ
||
50pF load to GND at
OUT,
SHDN
= V
DD
, f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
BESSEL FILTERS—MAX7409/MAX7413
f
IN
= 0.5f
C
Insertion Gain Relative to
DC Gain
f
IN
= f
C
f
IN
= 4f
C
f
IN
= 7f
C
BUTTERWORTH FILTERS—MAX7410/MAX7414
f
IN
= 0.5f
C
Insertion Gain Relative to
DC Gain
f
IN
= f
C
f
IN
= 3f
C
f
IN
= 5f
C
-0.3
-3.6
0
-3.0
-47.5
-70
-2.4
-43
-65
dB
-1
-3.6
-0.74
-3.0
-41.0
-64.3
-2.4
-35
-58
dB
CONDITIONS
MIN
TYP
MAX
UNITS
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.
4
_______________________________________________________________________________________
5th-Order, Lowpass,
Switched-Capacitor Filters
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.)
MAX7409/MAX7413
FREQUENCY RESPONSE
(BESSEL)
MAX7409 toc01
MAX7409/MAX7410/MAX7413/MAX7414
MAX7410/MAX7414
FREQUENCY RESPONSE
(BUTTERWORTH)
MAX7409 toc02
MAX7409/MAX7413
PASSBAND FREQUENCY RESPONSE
(BESSEL)
f
C
= 1kHz
-0.4
-0.8
GAIN (dB)
-1.2
-1.6
-2.0
-2.4
-3.0
-3.2
MAX7409 toc03
8
f
C
= 1kHz
0
-8
GAIN (dB)
10
f
C
= 1kHz
0
-10
GAIN (dB)
-20
-30
-40
-50
-60
-70
0
-16
-24
-32
-40
-48
-56
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT FREQUENCY (kHz)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT FREQUENCY (kHz)
0 102 204 306 408 510 612 714 816 918 1.02k
INPUT FREQUENCY (Hz)
MAX7410/MAX7414
PASSBAND FREQUENCY RESPONSE
(BUTTERWORTH)
f
C
= 1kHz
0
-0.5
GAIN (dB)
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
0 102 204 306 408 510 612 714 816 918 1.02k
INPUT FREQUENCY (Hz)
-250
0
0.2
MAX7409 toc04
MAX7409/MAX7413
PHASE RESPONSE
(BESSEL)
MAX7409 toc05
MAX7410/MAX7414
PHASE RESPONSE
(BUTTERWORTH)
f
C
= 1kHz
-50
PHASE SHIFT (DEGREES)
-100
-150
-200
-250
-300
-350
MAX7409 toc06
0.5
0
f
C
= 1kHz
PHASE SHIFT (DEGREES)
-50
0
-100
-150
-200
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.18
SUPPLY CURRENT (mA)
1.17
1.16
MAX7409 toc07
1.19
Table A. THD+N vs. Input Signal
Amplitude Plot Characteristics
LABEL
A
f
IN
(Hz)
200
1k
f
C
(kHz)
1
5
f
CLK
(kHz)
100
500
MEASUREMENT
BANDWIDTH (kHz)
22
80
1.15
1.14
1.13
1.12
1.11
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
B
_______________________________________________________________________________________
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