Rainbow Electronics MAX7415 User Manual

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General Description

The MAX7408/MAX7411/MAX7412/MAX7415 5th-order,
lowpass, elliptic, switched-capacitor filters (SCFs) oper­ate from a single +5V (MAX7408/MAX7411) or +3V
(MAX7412/MAX7415) supply. The 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
can be put into a low-power mode, reducing supply
current to 0.2µA.

Two clocking options are available: self-clocking (through
the use of an external capacitor) or external clocking for
tighter cutoff-frequency control. An offset-adjust pin
allows for adjustment of the DC output level.

The MAX7408/MAX7412 deliver 53dB of stopband
rejection and a sharp rolloff with a transition ratio of 1.6.
The MAX7411/MAX7415 achieve a sharper rolloff with a
transition ratio of 1.25 while still providing 37dB of stop­band rejection. Their fixed response limits the design
task to selecting a clock frequency.

Applications

ADC Anti-Aliasing CT2 Base Stations
Post-DAC Filtering Speech Processing

Features

♦ 5th-Order, Elliptic Lowpass Filters
♦ Low Noise and Distortion: -80dB THD + Noise
♦ Clock-Tunable Corner Frequency (1Hz to 15kHz)
♦ Single-Supply Operation

+5V (MAX7408/MAX7411)
+3V (MAX7412/MAX7415)

♦ Low Power

1.2mA (operating mode)

0.2µA (shutdown mode)

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

MAX7408/MAX7411/MAX7412/MAX7415

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

________________________________________________________________

Maxim Integrated Products

1

OS

OUTV

DD

1
2

87CLK

SHDNIN

GND

COM

µMAX/DIP

TOP VIEW

3

4

6

5

MAX7408
MAX7411
MAX7412
MAX7415

Typical Operating Circuit

19-1378; Rev 1; 10/98

Pin Configuration

Ordering Information

PART

MAX7408CPA

MAX7408CUA
MAX7408EPA -40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP
8 µMAX
8 Plastic DIP

MAX7408EUA

MAX7415CPA
MAX7415CUA
MAX7415EPA -40°C to +85°C

0°C to +70°C

0°C to +70°C

-40°C to +85°C 8 µMAX

8 Plastic DIP
8 µMAX
8 Plastic DIP

MAX7415EUA -40°C to +85°C 8 µMAX

PART

TRANSITION RATIO

OPERATING

VOLTAGE (V)

MAX7408 r = 1.6 +5
MAX7411 r = 1.25 +5

Selector Guide

MAX7412 r = 1.6 +3
MAX7415 r = 1.25 +3

MAX7411CPA
MAX7411CUA
MAX7411EPA -40°C to +85°C

0°C to +70°C

0°C to +70°C 8 Plastic DIP

8 µMAX

8 Plastic DIP
MAX7411EUA -40°C to +85°C 8 µMAX
MAX7412CPA
MAX7412CUA
MAX7412EPA -40°C to +85°C

0°C to +70°C

0°C to +70°C 8 Plastic DIP

8 µMAX

8 Plastic DIP
MAX7412EUA -40°C to +85°C 8 µMAX

V

SUPPLY

0.1µF

INPUT

CLOCK

IN

CLK

V

DD

MAX7408
MAX7411
MAX7412
MAX7415

GND

SHDN

OUT

COM

OUTPUT

OS

0.1µF

MAX7408/MAX7411/MAX7412/MAX7415

5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX7408/MAX7411

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

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 6.90mW/°C above +70°C)...............552mW

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)

TA= +25°C

Input, COM externally driven

OS to OUT

Measured with respect to COM

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

VIN= V

COM

= V

DD

/ 2

V

COM

= V

DD

/ 2 (Note 2)

Output, COM internally driven

CONDITIONS

19 27 34f

OSC

Internal Oscillator Frequency

±0.2 ±10Input Leakage Current at OS

±0.2 ±10Input Leakage Current at COM

50 500C

L

10 1R

L

Resistive Output Load Drive

5Clock Feedthrough

110 180R

COM

Input Resistance at COM

±0.1V

OS

Input Voltage Range at OS

V

DD

- 0.2

V

DDVDD

+ 0.2

2 2 2

100:1f

CLK/fC

Clock-to-Corner Ratio

0.001 to 15f

C

Corner-Frequency Range

V

DD

- 0.5

V

DDVDD

+ 0.5

2 2 2

V

COM

COM Voltage Range

1A

OS

Offset Voltage Gain

-81THD+N

Total Harmonic Distortion plus
Noise

10Clock-to-Corner Tempco

0.25 VDD- 0.25Output Voltage Range
±4 ±25V

OFFSET

Output Offset Voltage

0 0.2 0.4

DC Insertion Gain with Output
Offset Removed

MIN TYP MAXSYMBOLPARAMETER

0.5V

IL

Clock Input Low

4.5V

IH

Clock Input High

±12 ±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 Load
at OUT

FILTER

CLOCK

MAX7408/MAX7411/MAX7412/MAX7415

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

_______________________________________________________________________________________ 3

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

ELECTRICAL CHARACTERISTICS—MAX7408/MAX7411 (continued)

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

CLK

= 100kHz, TA= T

MIN

to T

MAX

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

ELECTRICAL CHARACTERISTICS—MAX7412/MAX7415

(VDD= +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to
GND, f

CLK

= 100kHz; TA= T

MIN

to T

MAX

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

CONDITIONS

MIN TYP MAXSYMBOLPARAMETER

Measured at DC

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

1.16 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

V

OS

Input Voltage Range at OS

110 180R

COM

Input Resistance at COM kΩ

(Note 1)

TA= +25°C

Measured with respect to COM

OS to OUT

fIN= 200Hz, VIN= 2.5Vp-p,
measurement bandwidth = 22kHz

VIN= V

COM

= V

DD

/ 2

V

COM

= V

DD

/ 2 (Note 2)

CONDITIONS

50 500C

L

10 1R

L

Resistance Output Load Drive

3Clock Feedthrough

±0.1

V

DD

- 0.1

V

DDVDD

+ 0.1

2 2 2

V

COM

COM Voltage Range

100:1f

CLK

/

f

C

Clock-to-Corner Ratio

0.001 to 15f

C

Corner-Frequency Range

1A

OS

Offset Voltage Gain

-79THD+N

Total Harmonic Distortion plus
Noise

10Clock-to-Corner Tempco

0.25 VDD- 0.25Output Voltage Range
±4 ±25V

OFFSET

Output Offset Voltage

0 0.2 0.4

DC Insertion Gain with Output
Offset Removed

MIN TYP MAXSYMBOLPARAMETER

pF

kΩ

mVp-p

V

V

V/V

dB

dB

mV

V

ppm/°C

kHz

UNITS

Maximum Capacitive Load
at OUT

Input Leakage Current at COM

SHDN = GND, V

COM

= 0 to V

DD

±0.2 ±10 µA

Input Leakage Current at OS VOS= 0 to V

DD

±0.2 ±10 µA

POWER REQUIREMENTS

SHUTDOWN

FILTER CHARACTERISTICS

MAX7408/MAX7411/MAX7412/MAX7415

5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters

4 _______________________________________________________________________________________

C

OSC

= 1000pF (Note 3)

CONDITIONS

19 27 34f

OSC

Internal Oscillator Frequency

MIN TYP MAXSYMBOLPARAMETER

Measured at DC

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

1.13 1.5

2.7 3.6V

DD

Supply Voltage

0.5V

IL

Clock Input Low

2.5V

IH

Clock Input High

±12 ±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

ELECTRICAL CHARACTERISTICS—MAX7412/MAX7415 (continued)

(VDD= +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to
GND, f

CLK

= 100kHz; TA= T

MIN

to T

MAX

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

mA

I

DD

Supply Current

ELLIPTIC FILTER (r = 1.6) CHARACTERISTICS—MAX7408/MAX7412

(VDD= +5V for MAX7408, VDD= +3V for MAX7412; filter output measured at OUT; 10kΩ || 50pF load to GND at OUT; SHDN = VDD;
V

COM

= V

OS

= V

DD

/ 2; f

CLK

= 100kHz; TA = T

MIN

to T

MAX

; unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)

f

IN

= 0.63f

C

fIN= 0.34f

C

fIN= 4.62f

C

fIN= 1.90f

C

fIN= 1.60f

C

fIN= 0.84f

C

fIN= 0.96f

C

fIN= f

C

CONDITIONS

-0.4 0.2 0.4

dB

-0.4 -0.2 0.4

Insertion Gain
with DC Gain Error Removed
(Note 4)

-53.4 -50

-53.4 -50

-53.4 -50

-0.4 -0.2 0.4

-0.4 0.2 0.4

-0.7 -0.2 0.2

UNITSMIN TYP MAXPARAMETER

CLOCK

POWER REQUIREMENTS

SHUTDOWN