GS3440 Adaptive Cable Equalizer

Final Data Sheet

Rev. 2

December 2012

16 of 23

Proprietary and Confidential

Automatic muting of the output can be enabled by connecting the CD pin to the OP_CTL pin.

If the connection is made directly, as shown in Figure 4-1, the output would be in its default

Figure 4-1: Direct Loopback

To enable automatic muting while the output is configured for other settings, a resistor

network should be used between CD and VCC_A. The intermediate voltages of this resistor

ladder can set the output to any one of the nine different settings as shown in Figure 4-2 and

Figure 4-3.

In Figure 4-2, the automatic muting of the output is established by connecting node 3 to the

there is a signal present.

In Figure 4-3, the OP_CTL pin is connected to node 4. In this scenario, the output would be

In both cases, the output would be muted when no carrier is detected.

Note:

When the device is in SLEEP mode, automatic muting and SQ_ADJ do not function.

Asserting the SLEEP pin manually overrides all other functionality.

Figure 4-2: Resistor Divider Loopback Example #1

(Function Level 3 from Table 4-5)

Figure 4-3: Resistor Divider Loopback Example #2

(Function Level 4 from Table 4-5)

VCC_A

1K 1K 1K 1K 1K 1K 1K 1K 2.6K

01

2

3

4

5

67

8

Levels

Taps

VCC_A

1K 1K 1K 1K 1K 1K 1K 1K 2.6K

01

2

3

4

5

67

8

Levels

Taps