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MAX7426 Datasheet(数据表) 1 Page - Maxim Integrated Products |
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MAX7426 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 page 
General Description The MAX7426/MAX7427 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7426) or +3V (MAX7427) supply. The devices draw only 0.8mA of supply current and allow corner fre- quencies from 1Hz to 12kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applica- tions. 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 MAX7426/MAX7427 deliver 37dB of stopband rejection and a sharp rolloff with a transition ratio of 1.25. 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 o 5th-Order, Elliptic Lowpass Filters o Low Noise and Distortion: -80dB THD + Noise o Clock-Tunable Corner Frequency (1Hz to 12kHz) o Single-Supply Operation +5V (MAX7426) +3V (MAX7427) o Low Power 0.8mA (Operating Mode) 0.2µA (Shutdown Mode) o Available in 8-Pin µMAX/PDIP Packages o Low Output Offset: ±4mV 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters ________________________________________________________________ Maxim Integrated Products 1 OS OUT VDD 1 2 8 7 CLK SHDN IN GND COM µMAX/PDIP TOP VIEW 3 4 6 5 MAX7426 MAX7427 VDD IN CLK OUT GND INPUT 0.1 µF 0.1 µF CLOCK SHDN OUTPUT COM OS MAX7426 MAX7427 VSUPPLY Typical Operating Circuit 19-1710; Rev 0; 4/00 Pin Configuration Ordering Information PART MAX7426CUA MAX7426CPA MAX7426EUA -40°C to +85°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 8 µMAX 8 Plastic DIP 8 µMAX MAX7426EPA -40°C to +85°C 8 Plastic DIP PART TRANSITION RATIO OPERATING VOLTAGE (V) MAX7426 r = 1.25 +5 Selector Guide MAX7427 r = 1.25 +3 MAX7427CUA MAX7427CPA MAX7427EUA -40°C to +85°C 0°C to +70°C 0°C to +70°C 8 µMAX 8 Plastic DIP 8 µMAX MAX7427EPA -40°C to +85°C 8 Plastic DIP 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. |
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