- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383875 > T7234 Compliance with the New ETSI PSD Requirement PDF資料下載
參數(shù)資料
| 型號(hào)： | T7234 |
| 英文描述： | Compliance with the New ETSI PSD Requirement |
| 中文描述： | 符合新的ETSI PSD的要求 |
| 文件頁(yè)數(shù)： | 105/116頁(yè) |
| 文件大?。?/td> | 1056K |
| 代理商： | T7234 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)當(dāng)前第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)
Data Sheet
January 1998
T7256 Single-Chip NT1 (SCNT1) Transceiver
Lucent Technologies Inc.
101
Questions and Answers
(continued)
Miscellaneous
(continued)
Q53:
Can you provide detailed information on the
active and idle power consumption of the T7256
A53:
The IDLE power of the T7256 is typically 35 mW.
The IDLE power will be increased if CKOUT or
the TDM highway are active. The discussion
below presents accurate numbers for adding in
the effects of CKOUT and the TDM highway.
When considering active power measurement fig-
ures, it is important to note that the conditions
under which power measurements are made are
not always completely stated by 2B1Q IC ven-
dors. For example, loop length is not typically
mentioned in the context of power dissipation, yet
power dissipation on a short loop is noticeably
greater than on a long loop. There are two rea-
sons for the increased power dissipation at
shorter loop lengths:
1. The overall loop impedance is smaller, requir-
ing a higher current to drive the loop.
2. The far-end transceiver is closer, requiring the
near-end transceiver to sink more far-end cur-
rent in order to maintain a virtual ground at its
transmitter outputs.
The following lab measurements provide an
example of how power dissipation varies with
loop length for a specific T7256 with its
15.36 MHz CKOUT output disabled (see the fol-
lowing table for information on CKOUT). Note that
power dissipation on a 0-length loop (the worst-
case loop) is about 35 mW higher than on a loop
of >3 kft length—a significant difference. Thus,
loop length needs to be considered when deter-
mining worst-case power numbers.
Table 43. Power Dissipation Variation
* This is the configuration used by some IC manufacturers.
Also, in the case of the T7256, the use of the out-
put clock CKOUT (pin 17) needs to be considered
since its influence on power dissipation is signifi-
cant. Some applications may make use of this
clock, while others may leave it 3-stated. The
power dissipation of CKOUT is shown in Table
44.
Table 44. Power Dissipation of CKOUT
Another factor influencing power consumption is
the S/T-interface data pattern. For example, when
transmitting an INFO 4 pattern with all 1s data in
the B and D channels, the power consumption is
25 mW lower than it is when transmitting INFO 2,
because INFO 2 is worst case in terms of the
amount of +0 and –0 transitions, and INFO 4 is
best case if the data is all 1s. A typical number
would lie about midway between these two. The
T7256 TDM highway, when active, can add
another 3 mW of power.
Loop Configuration
18 kft/26 awg
6 kft/26 awg
3 kft/26 awg
2 kft/26 awg
1 kft/26 awg
0.5 kft/26 awg
0 kft
135
load, ILOSS or
LPBK active, no far-end
transceiver*
Power (mW)
270
270
274
277
285
293
305
278
CKOUT
Frequency
(MHz)
15.36
10.24
Power Due to
CKOUT 40 pF
Load (mW)
21.3
17.7
Power Due to
CKOUT No
Load (mW)
11.0
9.1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T7234A | Compliance with the New ETSI PSD Requirement |
| T7237A | Compliance with the New ETSI PSD Requirement |
| T7256A | Compliance with the New ETSI PSD Requirement |
| T7288 | CEPT/E1 Line Interface(CEPT/E1 線接口) |
| T7290A | DS1/T1/CEPT/E1 Line Interface(DS1/T1/CEPT/E1 線接口) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T7234A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Compliance with the New ETSI PSD Requirement |
| T7237 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Compliance with the New ETSI PSD Requirement |
| T7237A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Compliance with the New ETSI PSD Requirement |
| T7240 | 制造商:TE Connectivity 功能描述: |
| T7-241A5 | 功能描述:撥動(dòng)開(kāi)關(guān) ON NONE OFF 2 Pole Standard Bat Handle RoHS:否 制造商:OTTO 觸點(diǎn)形式: 開(kāi)關(guān)功能: 電流額定值: 電壓額定值 AC: 電壓額定值 DC: 功率額定值: 端接類型: 安裝風(fēng)格: 端子密封: 觸點(diǎn)電鍍: 照明: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。