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參數(shù)資料
| 型號(hào)： | CLC034 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SMPTE 292M / 259M Adaptive Cable Equalizer |
| 中文描述： | 順從SMPTE 292M / 259M的自適應(yīng)電纜均衡 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 461K |
| 代理商： | CLC034 |
Block Diagram
20085902
Device Operation
BLOCK DESCRIPTION
The
Equalizer
block is a multi-stage adaptive filter. If Bypass
is high, the equalizer is disabled.
The
DC Restore
block receives the differential signals from
the equalizer filter block. This block incorporates a self-
biasing DC restore circuit to fully DC restore the signals. If
Bypass is high, this function is disabled.
The
Output
block produces SDO and SDO.
The
Cable Length Indicator
provides a voltage to indicate
the length of cable being equalized.
The
Mute Reference
determines the amount of cable to
equalize before muting the outputs. This is set by applying a
voltage proportional to the required length of cable. The
higher the voltage, the lower the mute threshold.
Carrier Detect / Mute
is bi-directional, serving two pur-
poses.As an output, carrier detect monitors the signal power
out of the equalizing filter and compares it to the mute
reference to determine if a valid signal is present. Carrier
detect provides a high voltage when no signal is present.
Mute can be forced on or off by using this pin as an input.
Mute is forced off if this pin is tied to ground, and the outputs
will always mute if this pin is tied to V
CC
.
The loop response in the
AEC
block is controlled by an
external 1μF capacitor placed across the AEC+ and AEC-
pins.
INPUT INTERFACING
The CLC034 accepts either differential or single-ended in-
put. The input must be AC coupled. Transformer coupling is
not supported.
The CLC034 correctly handles equalizer pathological signals
for standard definition and high definition serial digital video,
as described in SMPTE RP 178 and RP 198, respectively.
OUTPUT INTERFACING
The SDO and SDO outputs are internally loaded with 50
.
They produce a 750 mV
differential output, or a
375 mV
P-P
single-ended output.
REPLACING THE GENNUM GS1524
The CLC034 is form-fit-function compatible with the Gennum
GS1524.
C
www.national.com
5
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