OBSOLETE

CLC405

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SNOS815F – AUGUST 2000 – REVISED APRIL 2013

Figure 28.

(1)

at ±5V supplies.

Wideband Digital PGA

As shown on the front page, the CLC405 is easily configured as a digitally controlled programmable gain

each different gain. Use a TTL decoder that has enough outputs to control the selection of different gains and the

buffer stage. Connect the buffer stage like the buffer on the front page. The buffer isolates each gain stage from

the load and can produce a gain of zero for a gain selection of zero. Use of an inverter (7404) on the buffer

disable pin to keep the buffer operational at all gains except zero. Or float the buffer disable pin for a continuous

enable state.

Amplitude Equalization

Sending signals over coaxial cable greater than 50 meters in length will attenuate high frequency signal

components. Equalizers restore the attenuated components of this signal. The circuit in Figure 29, is an op amp

equalizer. The RC networks peak the response of the CLC405 at higher frequencies. This peaking restores

cable-attenuated frequencies. Figure 30 shows how the equalizer actually restores a digital word through 150

meters of coaxial cable.

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