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參數(shù)資料
| 型號： | GS9092A |
| 廠商： | Gennum Corporation |
| 英文描述： | GS9092A GenLINX-R III 270Mb/s Serializer for SDI and DVB-ASI |
| 中文描述： | GS9092A GenLINX - R的第三270Mb / s的串行SDI和DVB - ASI在內(nèi) |
| 文件頁數(shù)： | 46/59頁 |
| 文件大?。?/td> | 614K |
| 代理商： | GS9092A |
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GS9092A Data Sheet
34715 - 0
February 2006
46 of 59
3.10 Serial Digital Output
The GS9092A contains an integrated current mode differential serial digital output
buffer/cable driver, capable of driving 800mV into two single ended 75
Ω
loads.
Output pins SDO and SDO provide a single differential serial digital output.
Alternatively, two 75
Ω
connections can be driven using single ended drive.
To enable the output, SDO_EN must be set HIGH by the application layer. Setting
the SDO_EN signal LOW will cause the SDO and SDO output pins to become high
impedance, resulting in reduced device power consumption.
With suitable external return loss matching circuitry, the GS9092A's serial digital
outputs will provide a minimum output return loss of 15dB.
The output buffer / cable driver uses a separate power supply of +1.8V DC supplied
via the CD_VDD and CD_GND pins.
3.10.1 Output Swing
Nominally, the voltage swing of the serial digital output is 800mV
p-p
single-ended
into a 75
Ω
load. This is set externally by connecting the RSET pin to CD_VDD
through a resistor. The output swing may be adjusted by altering the value of the
RSET resistor.
SMPTE-compliant cable driver operation can be achieved at +1.8V operation by
connecting external pull-up resistors from the differential output to the +1.8V
source.
3.10.2 Serial Digital Output Mute Control
The GS9092A will automatically mute the serial digital output when RESET is
LOW. In this case, the SDO and SDO signals are set to the last logic state.
3.10.3 Output Return Loss Measurement
Under normal operating conditions the cable connected to the BNC connector will
provide a 75
Ω
load. Under this loaded condition, the outputs of the device swing
between V
CC
-0.4V and V
CC
-1.2V. When a 75
Ω
load is not connected to the BNC
connector, the outputs of the device will swing between V
CC
and V
CC
- 1.6V. The
difference in output swing is shown in
Figure 3-10
.
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