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參數(shù)資料
| 型號： | GS1532-CFE3 |
| 廠商： | Gennum Corporation |
| 英文描述： | GS1532 HD-LINX-TM II Multi-Rate Serializer |
| 中文描述： | GS1532的HD - LINX進程，商標(biāo)第二多速率串行器 |
| 文件頁數(shù)： | 41/52頁 |
| 文件大小： | 512K |
| 代理商： | GS1532-CFE3 |
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GS1532 Data Sheet
21498 - 6
June 2005
41 of 52
3.9 Serial Digital Output
The GS1532 contains an integrated current mode differential serial digital cable
driver with automatic slew rate control.
To enable the output, SDO_EN/DIS must be set HIGH by the application layer.
Setting the SDO_EN/DIS 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 GS1532's serial digital
outputs will provide a minimum output return loss of -15dB at SD rates. Gennum
recommends using the GS1528 SDI Dual Slew-Rate Cable Driver to meet output
return loss specifications at HD rates.
The integrated cable driver uses a separate power supply of +1.8V DC supplied via
the CD_VDD and CD_GND pins.
3.9.1 Output Swing
Nominally, the voltage swing of the serial digital output is 800mVp-p single-ended
into a 75
Ω
load. This is set externally by connecting the RSET pin to CD_VDD
through 281
Ω .
The output swing may be decreased by increasing the value of the RSET resistor.
The relationship is approximated by the curve shown in
Figure 3-4
.
Alternatively, the serial digital output swing can drive 800mVp-p into a 50
Ω
load.
Since the output swing is reduced by a factor of approximately one third when the
smaller load is used, the RSET resistor must be 187
Ω
to obtain 800mVp-p.
Figure 3-4: Serial Digital Output Swing
3.9.2 Serial Digital Output Mute
The GS1532 will automatically mute the serial digital output when the LOCKED
output signal is LOW. In this case, the SDO and SDO signals are set to a constant
voltage level.
50
Ω
load
300
400
500
600
700
800
900
1000
250 300 350 400 450 500 550 600 650 700
RSET(
Ω
)
Δ
V
S
(
200
75
Ω
load
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