The MAX7427CUA+ is a 5th order, low pass, elliptic, switched capacitor filter (SCF) in 8 pin μMAX package. It has a sharp roll-off with good stop band rejection and operates with a 100:1 clock to corner frequency ratio. The device emulate a passive network using switched capacitor integrators with summing and scaling. The passive network may be synthesized using CAD programs or may be found in many filter books. It draw only 0.8mA of supply current and allow corner frequencies from 1Hz to 12KHz, making device ideal for low power post-DAC filtering and anti-aliasing applications. It can be put into a low power mode, reducing supply current to 0.2μA. Device features two clocking options, self-clocking (through the use of an external capacitor) or external clocking for tighter cut-off-frequency control. An offset-adjust pin allows for adjustment of the DC output level. It is used in ADC anti-aliasing, post-DAC filtering, CT2 base stations and speech processing.
- Supply voltage range is 2.7V to 3.6V
- Operating temperature range from 0°C to 70°C
- Total harmonic distortion plus noise is -79dB at fIN = 200Hz
- Low output offset of ±4mV, offset voltage gain is +1V/V
- Sharp roll-off with a transition ratio of 1.25
- Clock to corner tempco is 10ppm/°C, corner-frequency range of 0.001KHz to 12KHz
- 17.5KHz internal oscillator frequency (COSC = 1000pF), ±7.5μA clock output current (VCLK = 0V or 3V)
- Power supply rejection ratio is 70dB at measured at DC
- Deliver 37dB of stopband rejection
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