Maxim MAX7409CPA, MAX7409CUA, MAX7413CPA, MAX7413CUA, MAX7413EPA Datasheet

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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 out­put level.

The MAX7409/MAX7413 Bessel filters provide low over­shoot 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

♦ 5th-Order Lowpass Filters

Bessel Response (MAX7409/MAX7413)
Butterworth Response (MAX7410/MAX7414)

♦ Clock-Tunable Corner Frequency (1Hz to 15kHz)
♦ Single-Supply Operation

+5V (MAX7409/MAX7410)
+3V (MAX7413/MAX7414)

♦ Low Power

1.2mA (operating mode)

0.2µA (shutdown mode)

♦ Available in 8-Pin µMAX/DIP Packages
♦ Low Output Offset: ±4mV

MAX7409/MAX7410/MAX7413/MAX7414

5th-Order, Lowpass,

Switched-Capacitor Filters

________________________________________________________________

Maxim Integrated Products

1

OS

OUTV

DD

1
2

87CLK

SHDNIN

GND

COM

µMAX/DIP

TOP VIEW

3

4

6

5

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
MAX7410CUA
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

MAX7409CUA

0°C to +70°C 8 µMAX

V

SUPPLY

0.1µF

INPUT

CLOCK

V

DD

SHDN

IN

MAX7409
MAX7410
MAX7413

CLK

MAX7414

GND

OUT

COM

OS

OUTPUT

0.1µF

MAX7409/MAX7410/MAX7413/MAX7414

5th-Order, Lowpass,
Switched-Capacitor Filters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX7409/MAX7410

(VDD= +5V, filter output measured at OUT, 10kΩ || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,

SHDN = VDD, f

CLK

= 100kHz, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +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.

VDDto 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)

VOS= 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

fIN= 200Hz, VIN= 4Vp-p,
measurement bandwidth = 22kHz

VIN= V

COM

= V

DD

/ 2

V

COM

= V

DD

/ 2 (Note 2)

Output, COM unconnected

CONDITIONS

21 30 38f

OSC

Internal Oscillator Frequency

±0.1 ±10Input Leakage Current at OS

±0.1 ±10Input Leakage Current at COM

50 500C

L

10 1R

L

Resistive Output Load Drive

5Clock Feedthrough

110 180R

COM

Input Resistance at COM

V

COM

±0.1V

OS

2.3 2.5 2.7

100:1f

CLK

/ f

c

Clock-to-Corner Ratio

0.001 to 15f

c

Corner Frequency

V

COM

1A

OS

Offset Voltage Gain

-85

THD+N

Total Harmonic Distortion
plus Noise

10Clock-to-Corner Tempco

0.25 V

DD

-

0.25Output Voltage Range

±4 ±25V

OFFSET

Output Offset Voltage

-0.2 0 0.2

DC Insertion Gain with
Output Offset Removed

MIN TYP MAX

SYMBOLPARAMETER

V

CLK

= 0 or 5V

0.5V

IL

Clock Input Low

4.5V

IH

Clock Input High

±13.5 ±20I

CLK

Clock Output Current
(Internal Oscillator Mode)

V

V

µA

kHz

µA

µA

pF

kΩ

mVp-p

kΩ

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

(VDD= +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, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX7413/MAX7414

(VDD= +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, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

CONDITIONS

MIN TYP MAX

SYMBOLPARAMETER

IN = COM (Note 4)

SHDN = GND

Operating mode, no load

0.5V

SDL

SHDN Input Low

4.5V

SDH

SHDN Input High

70PSRRPower-Supply Rejection Ratio

0.2 1I

SHDN

Shutdown Current

1.2 1.5Supply Current I

DD

4.5 5.5V

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 ±10VOS= 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

kΩ

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)

VIN= V

COM

= V

DD

/ 2

fIN= 200Hz, VIN= 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

kΩInput Resistance at COM R

COM

110 180

Input Voltage Range at OS V

OS

MAX7413
MAX7414 -81

FILTER CHARACTERISTICS

VOutput, COM unconnected

MAX7409/MAX7410/MAX7413/MAX7414

5th-Order, Lowpass,
Switched-Capacitor Filters

4 _______________________________________________________________________________________

C

OSC

= 1000pF (Note 3)

CONDITIONS

21 30 38f

OSC

Internal Oscillator Frequency

MIN TYP MAX

SYMBOLPARAMETER

IN = COM (Note 4)

SHDN = GND

Operating mode, no load

V

CLK

= 0 or 3V

0.5V

SDL

SHDN Input Low

2.5V

SDH

SHDN Input High

70PSRRPower-Supply Rejection Ratio

0.2 1I

SHDN

Shutdown Current

1.2 1.5

2.7 3.6V

DD

Supply Voltage

0.5V

IL

Clock Input Low

2.5V

IH

Clock Input High

±13.5 ±20I

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

(VDD= +5V for MAX7409/MAX7410, VDD= +3V for MAX7413/MAX7414, filter output measured at OUT, 10kΩ || 50pF load to GND at
OUT, SHDN = V

DD

, f

CLK

= 100kHz, TA = T

MIN

to T

MAX

, unless otherwise noted.)

Note 1: The maximum f

C

is defined as the clock frequency f

CLK

= 100 x fCat 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

/ ∆VIN.

Note 3: f

OSC

(kHz) ≅ 30 x 103/ C

OSC

(pF).

Note 4: PSRR is the change in output voltage from a V

DD

of 4.5V and a VDDof 5.5V.

CLOCK

POWER REQUIREMENTS

SHUTDOWN

CONDITIONS UNITS

MIN TYP MAX

PARAMETER

mAI

DD

Supply Current

ELECTRICAL CHARACTERISTICS—MAX7413/MAX7414 (continued)

(VDD= +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, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

fIN= 0.5f

C

-1 -0.74

fIN= f

C

-3.6 -3.0 -2.4

fIN= 4f

C

-41.0 -35

fIN= 7f

C

dB

-64.3 -58

fIN= 0.5f

C

dB

-0.3 0

fIN= 3f

C

fIN= f

C

-3.6 -3.0 -2.4

Insertion Gain Relative to
DC Gain

-47.5 -43

fIN= 5f

C

-70 -65

Insertion Gain Relative to
DC Gain

BESSEL FILTERS—MAX7409/MAX7413

BUTTERWORTH FILTERS—MAX7410/MAX7414