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參數(shù)資料
| 型號(hào)： | EL9111IL-T7 |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 3/13頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DIFF RCVR/EQUALZR TRPL 28-QFN |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 接收器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 0/3 |
| 規(guī)程： | 雙絞線 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | 帶卷 (TR) |
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11
FN7450.4
May 9, 2007
Decoding is based on the EL4543 encoding scheme, as
level system, which has been designed such that the sum of
the common mode voltages results in a fixed average DC
level with no AC content. This eliminates the effect of EMI
radiation into the common mode signals along the twisted
pairs of the cable.
The common mode voltages are initially extracted by the
EL9111 from the three input pairs. These are then passed to
an internal logic decoding block to provide Horizontal and
Vertical sync output signals (HOUT and VOUT).
FIGURE 27. H AND V SYNCS ENCODED
Sync Ref
The Sync Ref pin is the reference level for the logic low of the
sync outputs. It can be tied to 0V or -5V, but for typical
operation, the Sync Ref pin would tie to 0V. The Sync output
logic low level approaches Sync Ref within VCESAT; the logic
high will approach VSP within VCESAT. The EL9111 operating
with a 10V single supply and Sync Ref at ground will cause the
HOUT and VOUT pins to go from ground to VSP, a 10V swing.
This is too large a voltage for logic inputs, so an output voltage
divider of 1k
Ω series from the outputs with 1kΩ to ground will
reduce the output logic levels to 0V and 5V. Different logic
levels may require different output divider ratios.
The Sync Ref is intended to sink all the switching currents as
transitions to logic low are made. This prevents switching
signals crosstalk to the main chip 0V line, as well as adding the
flexibility of referencing to -5V. Thus, the logic output buffer
does use Sync Ref as its negative supply. The Sync Ref pin is
connected to the analog -5V or analog ground as needed and
is a separate pin to prevent noise coupling in the chip.
EL9111 with Single Ended Coax Input
The EL9111 is designed to use twisted pair cat 5 cable input
with sync encoded as differential CMV on the RGB pairs.
Coax cable inputs may be used with a few changes and
limitations. Coax cable cannot have sync encoded as CMV,
so the coax shields are grounded along with the EL9111
RGB minus inputs. The coax center conductor is terminated
with 75
Ω and connected to the RGB plus inputs. The result
is half the video signal will be seen as CMV by the sync
decoding circuit that decodes the video as sync. This causes
noise on the RGB outputs. The noise may be eliminated by
connecting the Sync Ref pin to VSP to disable the Sync
Outputs which now typically go to about 3V with +5VSP.
TABLE 1. H AND V SYNC DECODING
RED CM
GREEN CM
BLUE CM
HSYNC
VSYNC
Mid
High
Low
High
Low
Mid
Low
High
Low
High
Mid
High
Low
Mid
Low
High
NOTE: Level ‘Mid’ is halfway between ‘High’ and ‘Low’
TIME (0.5ms/DIV)
VOLTA
GE
(0.
5
V/
DIV
)
BLUE CM
OUT (CH A)
GREEN CM
OUT (CH B)
RED CM
OUT (CH C)
VSYNC
HSYNC
VO
LTA
GE
(2.
5
V/
DIV
)
EL9111, EL9112
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL9111ILZ | 功能描述:總線接收器 EL9111ILZ TRIPLE DIF REC/EQUALIZER RoHS:否 制造商:Texas Instruments 接收機(jī)數(shù)量:4 接收機(jī)信號(hào)類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel |
| EL9111ILZ-T13 | 功能描述:總線接收器 EL9111ILZ TRPL DIFFR NTLCVR/EQUALIZER RoHS:否 制造商:Texas Instruments 接收機(jī)數(shù)量:4 接收機(jī)信號(hào)類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel |
| EL9111ILZ-T7 | 功能描述:總線接收器 EL9111ILZ TRPL DIFFR NTLCVR/EQUALIZER RoHS:否 制造商:Texas Instruments 接收機(jī)數(shù)量:4 接收機(jī)信號(hào)類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel |
| EL9112 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Triple Differential Receiver/Equalizer |
| EL9112ES | 制造商:ELANTEC 功能描述: |
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