RC43 / RC43SB Sallen&Key RC-Lowpass Filter (20kHz)

 

Key Features

  • Smoothing or Antialiasing Filter
  • Supply Voltage 4.5 - 5.5 V
  • Small Area 0.338mm²
  • Size x=354µm y=955µm
  • With OP02B or SB1
  • Uses POLY2 resistors
  • Power-Down-Mode Ivdd < 1nA

Symbol

 

Block Diagram


Description

The RC43 and RC43SB macro cells are second order Sallen&Key lowpass filters for smoothing and antialiasing applications. RC43 uses OP02B and RC43SB uses SB1 as operational amplifier. Using RC43SB an input and output range from VSS to VDD can be applied.
As passive elements poly capacitors and poly2 resistors on top of poly1 are used. This distributed RC-network gives better linearity than filters using n-well resistors.
These two macro cells can be used as smoothing filters for sigma-delta- and digital-to-analogue-converters.

Pin List

Pin Description Capacitance
in analogue input x
pd power down 0.05pF
xpd power down not 0.05pF
out analogue output x
vdda positive analogue power supply x
vssa negative analogue power supply x
gnda analogue ground input x

 

Electrical Parameters

Parameter Symbol Min Typ Max Unit
Power Supply Range Vdd 4.5
5.0
5.5
V
Temperature Range Temp 0
25
85
deg
3dB Frequency (RC43) f0 13.2
20.3
32.7 kHz

For DC parameters please refer to

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