TLH5176 12

FIGURE 12 Bar Graph Display of Peak Detector Voltage

TLH5176 13

FIGURE 13 Technique for Measuring SN Improvement of the DNR System

CASCADE CONNECTION

Additional noise reduction can be obtained by cascading the

DNR filters With two filters cascaded the rolloff is 12 dB per

octave For proper operating bandwidth the capacitors on

pin 3 and 12 are changed to 15 nF The resulting noise

reduction is about 17 dB

Figure 15 shows the monaural cascade connection Note

that pin 14 is grounded so only the pin 2 input is fed to the

summing amp and therefore the control path

Figure 14 shows the stereo cascade connection Note that

pin 14 is open circuit as in normal stereo operation

TLH5176 14

1kX (refer to application hints)

FIGURE 14 Stereo Cascade Connection

6