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參數(shù)資料
| 型號： | ISL54105CRZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TMDS REGENERATOR 72-QFN |
| 標準包裝： | 1,680 |
| 應(yīng)用： | 多媒體顯示器，測試設(shè)備 |
| 接口： | I²C |
| 電源電壓： | 3 V ~ 3.6 V |
| 封裝/外殼： | 72-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 72-QFN（10x10） |
| 包裝： | 托盤 |
| 安裝類型： | 表面貼裝 |
11
FN6723.0
June 11, 2008
drawing current from the external TMDS receiver it is
attached to.
This is non-ideal and can cause the ISL54105 to fail HDMI
Compliance Test 7-3 (“VOFF”). VOFF is the voltage across
each 50
Ω Rx
N resistor when the power is removed from the
device containing the ISL54105.
Modifying the PCB layout per Figure 9 to add a Schottky
diode between the VD power net and the VD_ESD pins,
eliminates current flow from the ESD bus into VD. This
reduces the amount of current drawn from the Tx supply, but
there is still some circuitry attached to the internal ESD bus
that will sink some current. So the current drawn from Rx will
be lower than if the diode were not there (reducing the VOFF
magnitude), but still not low enough to pass Test 7-3.
Intersil is currently sampling the ISL54105A, which is fully
compliant with Test 7-3 when applied using the circuit shown
in Figure 9. The ISL54105A is 100% drop-in and backwards
compatible with the ISL54105.
Using the ISL54105A in a layout designed for the ISL54105
(Figure 8) will result in the same behavior as the original
version. See Table 1 for the full matrix.
Intersil recommends adding the Schottky circuit to all
designs to reduce Rx current drain in systems using the
original version and completely eliminate it in systems using
the ISL54105A.
Inter-Pair (Channel-to-Channel) Skew
The read pointers for Channel 0, 1, and 2 of the FIFO that
follows the CDR all have the same clock, so all 3 channels
transition within a few picoseconds of each other - there is
essentially no skew between the transitions of the three
channels.
However the FIFO read pointers may be positioned up to 2
bits apart relative to each other, introducing a random, fixed
channel-to-channel skew of skew of 1 or (much less
frequently) 2 bits. The random skew is introduced whenever
there is a discontinuity in the input signal (typically a video
mode change or a new mux channel selection). After the
CDRs and PLL lock, the skew is fixed until the next
discontinuity. This adds up to 2 bits of skew in addition to any
incoming skew, as shown in the following examples.
Figure 10 shows an input (the top three signals) with
essentially no skew. After the ISL54105 locks on to the
signal, there may be 1 bit of skew on the output, as shown in
When there is pre-existing skew on the input, the ISL54105
can add up to 2 bits to the channel-to-channel skew. In the
example in Figure 11, the incoming red channel has 2.3 bits
FIGURE 8. ISL54105 ESD PROTECTION DIODES
ISL54105
VD
VD_ESD
(41, 53)
3.3VTX
TxN
Tx
3.3VRX
50
RxN
FIGURE 9. SCHOTTKY DIODE MODIFICATION
ISL54105
VD
VD_ESD
(41, 53)
3.3VTX
TxN
Tx
3.3VRX
50
RxN
D1
C1
0.1
μF
TABLE 1. VERSION/LAYOUT MATRIX
VERSION
FIGURE 8
FIGURE 9
ISL54105
Fails 7-3
Fails 7-3 (not as badly)
ISL54105A
Fails 7-3
Passes 7-3
FIGURE 10. MAXIMUM ADDITIONAL INTERCHANNEL SKEW
FOR INPUTS WITH NO OR LITTLE SKEW
Bit 4
Bit 5
Bit 6
Bit 7
Bit 0
Bit 1
Bit 2
Bit 3
B
Bit 8
Bit 9
Bit 4
Bit 5
Bit 6
Bit 7
Bit 0
Bit 1
Bit 2
Bit 3
B
Bit 8
Bit 9
Bit 4
Bit 5
Bit 6
Bit 7
Bit 0
Bit 1
Bit 2
Bit 3
B
Bit 8
Bit 9
Bit 4
Bit 5
Bit 6
Bit 0
Bit 1
Bit 2
Bit 3
B
Bit 7
Bit 8
Bit 9
Bit 4
Bit 5
Bit 6
Bit 7
Bit 0
Bit 1
Bit 2
Bit 3
B
Bit 8
Bit 9
Bit 4
Bit 5
Bit 6
Bit 7
Bit 0
Bit 1
Bit 2
Bit 3
B
Bit 8
Bit 9
INPUT SKEW
(none, in this
example)
OUTPUT SKEW
(1 bit – 615ps at
162.5Mpixels/s)
ISL54105
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL54105CRZ-EVALZ | 制造商:Intersil Corporation 功能描述:ISL54105CRZ EVALUATION BOARD, ROHS - Bulk |
| ISL54106ACRZ | 功能描述:IC TMDS REGENERATOR MUX RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標準包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| ISL54106CRZ | 功能描述:IC TMDS REGENERATOR MUX RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標準包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| ISL54111CATX-EVALZ | 制造商:Intersil Corporation 功能描述:ISL54111CATX EVALUATION BOARD - ROHS COMPLIANT - Bulk |
| ISL54111HDMI-EVALZ | 制造商:Intersil Corporation 功能描述:ISL54111HDMI EVALUATION BOARD - ROHS COMPLIANT - Bulk |
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