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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7408 Datasheet

Switched-Capacitor Filters

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19-1378; Rev 1; 10/98
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
General Description
The MAX7408/MAX7411/MAX7412/MAX7415 5th-order,
lowpass, elliptic, switched-capacitor filters (SCFs) oper-
ate 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 stop-
band rejection. Their fixed response limits the design
task to selecting a clock frequency.
ADC Anti-Aliasing
Post-DAC Filtering
Applications
CT2 Base Stations
Speech Processing
Selector Guide
PART TRANSITION RATIO
MAX7408
MAX7411
MAX7412
MAX7415
r = 1.6
r = 1.25
r = 1.6
r = 1.25
OPERATING
VOLTAGE (V)
+5
+5
+3
+3
Typical Operating Circuit
VSUPPLY
0.1µF
INPUT
CLOCK
VDD SHDN
IN OUT
MAX7408
MAX7411
CLK
MAX7412
MAX7415
COM
OS
GND
OUTPUT
0.1µF
Features
o 5th-Order, Elliptic Lowpass Filters
o Low Noise and Distortion: -80dB THD + Noise
o Clock-Tunable Corner Frequency (1Hz to 15kHz)
o Single-Supply Operation
+5V (MAX7408/MAX7411)
+3V (MAX7412/MAX7415)
o Low Power
1.2mA (operating mode)
0.2µA (shutdown mode)
o Available in 8-Pin µMAX/DIP Packages
o Low Output Offset: ±4mV
PART
MAX7408CPA
MAX7408CUA
MAX7408EPA
MAX7408EUA
MAX7411CPA
MAX7411CUA
MAX7411EPA
MAX7411EUA
MAX7412CPA
MAX7412CUA
MAX7412EPA
MAX7412EUA
MAX7415CPA
MAX7415CUA
MAX7415EPA
MAX7415EUA
Ordering Information
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
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 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
Pin Configuration
TOP VIEW
COM 1
IN 2
GND 3
VDD 4
MAX7408
MAX7411
MAX7412
MAX7415
8 CLK
7 SHDN
6 OS
5 OUT
µMAX/DIP
________________________________________________________________ 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 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7408 Datasheet

Switched-Capacitor Filters

No Preview Available !

5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V
IN, OUT, COM, OS, CLK, SHDN ................-0.3V to (VDD + 0.3V)
OUT Short-Circuit Duration...................................................1sec
Continuous Power Dissipation (TA = +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
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—MAX7408/MAX7411
(VDD = +5V; filter output measured at OUT, 10k|| 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to GND,
fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
FILTER
Corner-Frequency Range
Clock-to-Corner Ratio
Clock-to-Corner Tempco
fC
fCLK/fC
(Note 1)
0.001 to 15
100:1
10
kHz
ppm/°C
Output Voltage Range
Output Offset Voltage
VOFFSET VIN = VCOM = VDD / 2
0.25
VDD - 0.25
±4 ±25
V
mV
DC Insertion Gain with Output
Offset Removed
VCOM = VDD / 2 (Note 2)
0 0.2 0.4 dB
Total Harmonic Distortion plus
Noise
THD+N
fIN = 200Hz, VIN = 4Vp-p,
measurement bandwidth = 22kHz
-81 dB
Offset Voltage Gain
COM Voltage Range
Input Voltage Range at OS
Input Resistance at COM
Clock Feedthrough
Resistive Output Load Drive
Maximum Capacitive Load
at OUT
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
AOS
VCOM
VOS
RCOM
RL
CL
OS to OUT
Input, COM externally driven
Output, COM internally driven
Measured with respect to COM
TA = +25°C
SHDN = GND, VCOM = 0 to VDD
VOS = 0 to VDD
fOSC
ICLK
VIH
VIL
COSC = 1000pF (Note 3)
VDD
2
-
0.5
VDD
2
-
0.2
110
10
1
VDD
2
VDD
2
±0.1
180
5
1
V/V
VDD
2
+
0.5
VDD
2
+
0.2
V
V
k
mVp-p
k
50 500
pF
±0.2
±0.2
±10
±10
µA
µA
19 27 34 kHz
±12 ±20
µA
4.5 V
0.5 V
2 _______________________________________________________________________________________


Part Number MAX7408
Description Switched-Capacitor Filters
Maker Maxim
Total Page 12 Pages
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