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MAX7418 Dataheets PDF



Part Number MAX7418
Manufacturers Maxim
Logo Maxim
Description 5th-Order / Lowpass / Switched-Capacitor Filters
Datasheet MAX7418 DatasheetMAX7418 Datasheet (PDF)

19-1821; Rev 0; 11/00 MAX7418–MAX7425 5th-Order, Lowpass, Switched-Capacitor Filters General Description The MAX7418–MAX7425 5th-order, low-pass, switchedcapacitor 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, making them ideal for low-power post-DAC filtering and antialiasing applications. They feature a shutdown mode that reduces supply current to 0.2µA.

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19-1821; Rev 0; 11/00 MAX7418–MAX7425 5th-Order, Lowpass, Switched-Capacitor Filters General Description The MAX7418–MAX7425 5th-order, low-pass, switchedcapacitor 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, making them ideal for low-power post-DAC filtering and antialiasing 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 stopband rejection. The MAX7419/MAX7423 Bessel filters provide low overshoot and fast settling, and the MAX7420/MAX7424 Butterworth filters provide a maximally flat passband response. Their fixed response simplifies 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. 5th-Order, Lowpass, Switched-Capacitor Filters MAX7418–MAX7425 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.


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