GS1574ACNE3 GENNUM, GS1574ACNE3 Datasheet - Page 14

• Manufacturer Part Number: GS1574ACNE3
• Description: EQUALIZER, ADAPTER, HD-LINX II, 16QFN
• Manufacturer: GENNUM

Specifications of GS1574ACNE3

• Supply Voltage Range: 3.135V To 3.465V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: QFN
• No. Of Pins: 16

6.3 Programmable Mute Output
For SMPTE 259M inputs, the GS1574A incorporates a programmable threshold output
mute (MCLADJ).
In applications where there are multiple input channels using the GS1574A, it is
advantageous to have a programmable mute output to avoid signal crosstalk.
The output of the GS1574A can be muted when the input signal decreases below a
certain input level. This threshold is determined using the input voltage applied to the
MCLADJ pin. The MCLADJ pin may be left unconnected for applications where output
muting is not required.
This feature has been designed for use in applications such as routers where signal
crosstalk and circuit noise cause the equalizer to output erroneous data when no input
signal is present. The use of a Carrier Detect function with a fixed internal reference
does not solve this problem since the signal to noise ratio on the circuit board could be
significantly less than the default signal detection level set by the on chip reference.
NOTE: MCLADJ is only recommended for data rates up to 360Mb/s. For data rates above
this, MCLADJ should be left floating.
6.4 Mute and Carrier Detect
The GS1574A includes a MUTE input pin that allows the application interface to mute
the serial digital output at any time. Set the MUTE pin HIGH to mute SDO and SDO. In
this case, the outputs will mute regardless of the setting of the BYPASS pin.
A Carrier Detect output pin (CD) indicates the presence of a valid signal at the input of
the GS1574A. When CD is LOW, the device has detected a valid input on SDI and SDI.
When CD is HIGH, the device has not detected a valid input.
NOTE: CD will only detect loss of carrier for data rates greater than 19Mb/s. The CD
output pin may be connected directly to the MUTE input pin to enable automatic muting
of the GS1574A when no valid input signal has been detected.
NOTE: If the maximum cable length is exceeded and the device is not in bypass mode
the GS1574A will not assert the CD pin even if a carrier is present.
GS1574A HD-LINX® II Adaptive Cable Equalizer
14 of 18
Data Sheet
33416 - 9
September 2009
Proprietary & Confidential