(PDF) MAX7425 Datasheet PDF | Maxim





MAX7425 Datasheet PDF

Part Number MAX7425
Description 5th-Order / Lowpass / Switched-Capacitor Filters
Manufacture Maxim
Total Page 14 Pages
PDF Download Download MAX7425 Datasheet PDF

Features: Datasheet pdf 19-1821; Rev 0; 11/00 MAX7418–MAX7425 5th-Order, Lowpass, Switched-Capacito r Filters General Description The MAX7 418–MAX7425 5th-order, low-pass, swit chedcapacitor filters (SCFs) operate fr om a single +5V (MAX7418–MAX7421) or +3V (MAX7422–MAX7425) supply. These d evices draw only 3mA of supply current and allow corner frequencies from 1Hz t o 45kHz, making them ideal for low-powe r post-DAC filtering and antialiasing a pplications. They feature a shutdown mo de that reduces supply current to 0.2µ A. Two clocking options are available: self-clocking (through the use of an ex ternal capacitor), or external clocking for tighter corner-frequency control. An offset adjust pin allows for adjustm ent of the DC output level. The MAX7418 /MAX7422 deliver 53dB of stopband rejec tion and a sharp rolloff with a 1.6 tra nsition ratio. The MAX7421/MAX7425 achi eve a sharper rolloff with a 1.25 trans ition ratio while still providing 37dB of stopband rejection. The MAX7419/MAX7423 Bessel filters provide low ov.

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MAX7425 datasheet
19-1821; Rev 0; 11/00
5th-Order, Lowpass,
Switched-Capacitor Filters
General Description
The MAX7418–MAX7425 5th-order, low-pass, switched-
capacitor filters (SCFs) operate from a single +5V
(MAX7418–MAX7421) or +3V (MAX7422–MAX7425)
supply. These devices draw only 3mA of supply current
and allow corner frequencies from 1Hz to 45kHz, mak-
ing them ideal for low-power post-DAC filtering and anti-
aliasing applications. They feature a shutdown mode
that reduces supply current to 0.2µA.
Two clocking options are available: 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 MAX7418/MAX7422 deliver 53dB of stopband
rejection and a sharp rolloff with a 1.6 transition ratio.
The MAX7421/MAX7425 achieve a sharper rolloff with a
1.25 transition ratio while still providing 37dB of stop-
band rejection. The MAX7419/MAX7423 Bessel filters
provide low overshoot and fast settling, and the
MAX7420/MAX7424 Butterworth filters provide a maxi-
mally flat passband response. Their fixed response sim-
plifies the design task of selecting a clock frequency.
Applications
ADC Anti-Aliasing
DAC Postfiltering
CT2 Base Stations
Speech Processing
Selector Guide
PART
FILTER RESPONSE
OPERATING
VOLTAGE (V)
MAX7418
r = 1.6
+5
MAX7419
Bessel
+5
MAX7420
Butterworth
+5
MAX7421
r = 1.25
+5
Selector Guide continued at end of data sheet.
Pin Configuration
TOP VIEW
COM 1
IN 2
GND 3
VDD 4
MAX7418–
MAX7425
8 CLK
7 SHDN
6 OS
5 OUT
Features
o 5th-Order, Lowpass Filters
Elliptic Response (MAX7418/MAX7421/
MAX7422/MAX7425)
Bessel Response (MAX7419/MAX7423)
Butterworth Response (MAX7420/MAX7424)
o Clock-Turnable Corner Frequency (1Hz to 45kHz)
o Single-Supply Operation
+5V (MAX7418–MAX7421)
+3V (MAX7422–MAX7425)
o Low Power
3mA (Operating Mode)
0.2µA (Shutdown Mode)
o Available in 8-Pin µMAX Package
o Low Output Offset: ±4mV
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX7418CUA
0°C to +70°C
8 µMAX
MAX7418EUA
-40°C to +85°C 8 µMAX
MAX7419CUA
0°C to +70°C
8 µMAX
MAX7419EUA
-40°C to +85°C 8 µMAX
MAX7420CUA
0°C to +70°C
8 µMAX
MAX7420EUA
-40°C to +85°C 8 µMAX
MAX7421CUA
0°C to +70°C
8 µMAX
MAX7421EUA
-40°C to +85°C 8 µMAX
Ordering Information continued at end of data sheet.
Typical Operating Circuit
VSUPPLY
0.1µF
INPUT
CLOCK
VDD SHDN
IN OUT
MAX7418–
MAX7425
CLK COM
OS
GND
OUTPUT
0.1µF
µMAX
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

MAX7425 datasheet
5th-Order, Lowpass,
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.......................................................1s
Continuous Power Dissipation (TA = +70°C)
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
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+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—MAX7418–MAX7421
(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, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
FILTER CHARACTERISTICS
Corner Frequency
Clock-to-Corner Ratio
Clock-to-Corner Tempco
fc VIN = 4Vp-p (Note 1)
fCLK / fC
0.001 to 30
100:1
10
kHz
ppm/°C
Output Voltage Range
Output Offset Voltage
DC Insertion Gain with
Output Offset Removed
VOFFSET
VIN = VCOM = VDD / 2
VCOM = VDD / 2
(Note 2)
MAX7418/MAX7421
MAX7419/MAX7420
0.25
0
-0.2
VDD - 0.25
±4 ±25
0.2 0.4
0 +0.2
V
mV
dB
Total Harmonic Distortion
plus Noise
THD+N
fIN = 2KHz,
VIN = 4Vp-p,
measurement
bandwidth = 80kHz
MAX7418
MAX7419
MAX7420
MAX7421
-76
-78
dB
-67
-78
Offset Voltage Gain
COM Voltage Range
AOS
VCOM
OS to OUT
Input, COM externally driven
Output, COM unconnected
1
2.0 2.5 3.0
2.3 2.5 2.7
V/V
V
Input Voltage Range at OS
Input Resistance at COM
Clock Feedthrough
VOS
RCOM
Input, OS externally driven
VCOM ±0.1
100 140
5
V
kΩ
mVp-p
Resistive Output Load Drive
RL
10 1
kΩ
Maximum Capacitive Output
Load Drive
CL
50 500
pF
Input Leakage Current at COM
Input Leakage Current at OS
CLOCK
SHDN = GND, VCOM = 0 to VDD
VOS = 0 to VDD
±0.1
±0.1
±10
±10
µA
µA
Internal Oscillator Frequency
fOSC
COSC = 1000pF (Note MAX7418/MAX7421
3) MAX7419/MAX7420
68
86
87 106
kHz
110 135
Clock Output Current
(Internal Oscillator Mode)
ICLK VCLK = 0 or 5V
MAX7418/MAX7421
MAX7419/MAX7420
±40 ±60
µA
±50 ±75
Clock Input High
Clock Input Low
VIH
VIL
4.5 V
0.5 V
2 _______________________________________________________________________________________




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