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Part: MAX7408E
Category:
Analog & Mixed-Signal Processing
-> Filters
Description: 5th Order, Lowpass, Elliptic, Switched-capacitor Filters
Company: Maxim Integrated Products
Datasheet: Download MAX7408E datasheet File size : 554 kB
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Datasheet text preview:
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) opera t e 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. T h e 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. 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
Features
MAX7408/MAX7411/MAX7412/MAX7415
Ordering Information
PART MAX7408CPA MAX7408CUA MAX7408EPA MAX7408EUA MAX7411CPA MAX7411CUA MAX7411EPA MAX7411EUA MAX7412CPA MAX7412CUA MAX7412EPA MAX7412EUA MAX7415CPA MAX7415CUA MAX7415EPA MAX7415EUA 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
Applications
ADC Anti-Aliasing Post-DAC Filtering CT2 Base Stations Speech Processing
Selector Guide
PART MAX7408 MAX7411 MAX7412 MAX7415 TRANSITION RATIO 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 VDD INPUT IN SHDN OUT OUTPUT
Pin Configuration
TOP VIEW
COM IN COM OS 0.1µF GND 1 2 3 8 7 CLK SHDN OS OUT
CLOCK
CLK
MAX7408 MAX7411 MAX7412 MAX7415
GND
VDD 4
MAX7408 MAX7411 MAX7412 MAX7415
µMAX/DIP
6 5
________________________________________________________________ Maxim Integrated Products
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5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters MAX7408/MAX7411/MAX7412/MAX7415
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 FILTER Corner-Frequency Range 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 THD+N AOS VOFFSET VIN = VCOM = VDD / 2 VCOM = VDD / 2 (Note 2) fIN = 200Hz, VIN = 4Vp-p, measurement bandwidth = 22kHz OS to OUT Input, COM externally driven COM Voltage Range VCOM Output, COM internally driven 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 fOSC ICLK VIH VIL 4.5 0.5 COSC = 1000pF (Note 3) 19 27 ±12 34 ±20 kHz µA V V RL CL SHDN = GND, VCOM = 0 to VDD VOS = 0 to VDD VOS RCOM TA = +25°C 10 50 Measured with respect to COM 110 VDD - 0.5 2 VDD - 0.2 2 0 0.25 ±4 0.2 -81 1 VDD 2 VDD 2 ±0.1 180 5 1 500 ±0.2 ±0.2 ±10 ±10 VDD + 0.5 2 V VDD + 0.2 2 V k mVp-p k pF µA µA fC fCLK/fC (Note 1) 0.001 to 15 100:1 10 VDD - 0.25 ±25 0.4 ppm/°C V mV dB dB V/V kHz SYMBOL CONDITIONS MIN TYP MAX UNITS
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5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS--MAX7408/MAX7411 (continued)
(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 POWER REQUIREMENTS Supply Voltage Supply Current Shutdown Current Power-Supply Rejection Ratio SHUTDOWN SHDN Input High SHDN Input Low SHDN Input Leakage Current VSDH VSDL VSHDN = 0 to VDD ±0.2 4.5 0.5 ±10 V V µA VDD IDD I SHDN PSRR Operating mode, no load SHDN = GND Measured at DC 4.5 1.16 0.2 70 5.5 1.5 1 V mA µA dB SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX7408/MAX7411/MAX7412/MAX7415
ELECTRICAL CHARACTERISTICS--MAX7412/MAX7415
(VDD = +3V, filter output measured at OUT pin, 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 FILTER CHARACTERISTICS Corner-Frequency Range 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 Load at OUT Input Leakage Current at COM Input Leakage Current at OS RL CL SHDN = GND, VCOM = 0 to VDD VOS = 0 to VDD THD+N AOS VCOM VOS RCOM TA = +25°C 10 50 Measured with respect to COM 110 VOFFSET VIN = VCOM = VDD / 2 VCOM = VDD / 2 (Note 2) fIN = 200Hz, VIN = 2.5Vp-p, measurement bandwidth = 22kHz OS to OUT VDD - 0.1 2 0 0.25 ±4 0.2 -79 1 VDD 2 ±0.1 180 3 1 500 ±0.2 ±0.2 ±10 ±10 VDD + 0.1 2 fC fCLK/fC (Note 1) 0.001 to 15 100:1 10 VDD - 0.25 ±25 0.4 ppm/°C V mV dB dB V/V V V k mVp-p k pF µA µA kHz SYMBOL CONDITIONS MIN TYP MAX UNITS
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