Instruction manual

Output Amp Specifications
6-15
■ Filter Characteristics
The analog filter is a 2nd-order Butterworth filter, with a cutoff frequency that is about 1.2 times the aliasing
frequency (1/2Fs).
The digital filter attenuation characteristics are about -6 dB at 1/2Fs. The input amp and output amp are
both added for the input signal, so (as shown in the following diagram) the attenuation is about -12 dB at an
aliasing frequency (1/2 Fs).
Block Diagram
-6 dB
Analog filter
(-12 dB/oct)
1/2 Fs
Digital filter
1.1 x 1/2 Fs
Out
put Amp
D/A
PLD
Out
put Amp
D/A
OUT
1
OUT
8
FIFO
DSP
FIFO
RAM