- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383876 > T7570 (Lineage Power) Programmable PCM Codec with Hybrid-Balance Filter(帶混合平衡濾波器的可編程PCM編解碼器) PDF資料下載
參數(shù)資料
| 型號： | T7570 |
| 廠商： | Lineage Power |
| 元件分類： | Codec |
| 英文描述： | Programmable PCM Codec with Hybrid-Balance Filter(帶混合平衡濾波器的可編程PCM編解碼器) |
| 中文描述： | 可編程PCM編解碼器與混合平衡濾波器（帶混合平衡濾波器的可編程的PCM編解碼器） |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 489K |
| 代理商： | T7570 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
10
Lucent Technologies Inc.
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Data Sheet
October 1996
Functional Description
(continued)
Programmable Functions
(continued)
Table 7. Time-Slot and Port Assignment Instruction
* T
5
is the MSB of the time-slot assignment.
Bit Number and Name
5
4
T
5
*
T
4
X
X
7
6
3
T
3
X
2
T
2
X
1
T
1
X
0
T
0
X
EN
0
PS
0
Function
Disable D
X
0 Output (transmit instruction)
Disable D
R
0 Input (receive instruction)
Disable D
X
1 Output (transmit instruction)
Disable D
R
1 Input (receive instruction)
0
1
X
X
X
X
X
X
1
0
Assign One Binary-coded Time Slot from 0—63 Enable D
X
0 Output (transmit instruction)
Enable D
R
0 Input (receive instruction)
1
1
Assign One Binary-coded Time Slot from 0—63 Enable D
X
1 Output (transmit instruction)
Enable D
R
1 Input (receive instruction)
Transmit Gain Instruction Byte 2
The transmit gain can be programmed in 0.1 dB steps
from –0.4 dB to +19.0 dB by writing to the transmit gain
register as defined in Tables 2 and 8. This corresponds
to a range of 0 dBm0 levels at VF
X
I between
0.811 Vrms and 0.087 Vrms (equivalent to +0.4 dBm to
–19.0 dBm into 600
).
To set transmit gain, determine the gain required of the
codec in order to achieve the overall desired transmis-
sion level point (TLP) at the PCM interface (usually
0 dBm or –2 dBm).
In order for the internal hybrid-balance circuitry to be
effective, the portion of VF
R
O returned to the codec
analog input must be between –2.5 dB to –10.25 dB of
the VF
R
O output. For instance, if a SLIC presents a
–6 dBm signal to VF
X
I when VF
R
O produces 0 dBm,
good hybrid balance can be achieved. If the returned
signal requires amplification to satisfy this requirement,
then an additional op amp in the transmit path would be
required. The T7570 will accommodate the phase
inversion. A spare op amp is provided in some Lucent
SLICs.
Once the codec gain is chosen, determine what signal
level at VF
X
I would provide the desired TLP output at
Dx. For our example of +6 dB gain (Gx) providing a
0 dBm TLP and working backwards from Dx, take the
antilog of minus 6 dB divided by 20 and multiply by the
0.7746 reference level to obtain the signal level at VF
X
I
in Vrms. As follows:
(1)
antilog
10
(–Gx / 20) * 0.7746 = Vrms
Finally, convert the signal level to a decimal number (n)
using the following formula:
(2)
200 * log
10
(Vrms / 0.08592) = n
Round n to the nearest integer and convert to binary.
This is the code required by byte 2 of this instruction.
Some examples are given in Table 8.
Table 8. Byte 2 of Transmit Gain Instructions
* 0 dB path gain setting.
Programming values greater than those listed in this table are
permitted. However, large signals may cause overload.
Receive Gain Instruction Byte 2
The receive gain can be programmed in 0.1 dB steps
from –17.3 dB to +2.1 dB by writing to the receive gain
register as defined in Tables 2 and 9. This corresponds
to a range of 0 dBm0 levels at VF
R
O between
0.987 Vrms and 0.106 Vrms (equivalent to +2.1 dBm to
–17.3 dBm into 600
).
Bit Number
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1
0 0 0 0 0 0 1 0
—
1 0 1 1 1 1 1 1*
—
1 1 0 0 0 0 1 0
1 1 0 0 0 0 1 1
0 dBm0 Test Level (Vrms)
at VF
X
I
No Output
0.087
0.088
—
0.7746
—
0.802
0.811
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T7633 | Dual T1/E1 3.3 V Short-Haul Terminator(雙T1/E1 3.3V短通信距離終端器) |
| T7688 | 5.0 V E1/CEPT Quad Line Interface(5.0 V E1/CEPT四線接口) |
| T7689 | 5.0 V T1 Quad Line Interface(5.0 V T1四線接口) |
| T7690 | 5.0 V T1/E1 Quad Line Interface(5.0 V T1/E1 四線接口) |
| T7693 | 3.3 V T1/E1 Quad Line Interface( 3.3 V T1/E四線接口) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T-758 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:Transformer |
| T-759 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SCHEMATIC DIAGRAM |
| T75A | 制造商:EGS Appleton 功能描述:Exact Equal/ 1-5 Days |
| T75F-C | 功能描述:非熱縮管和套管 SPIRAL WRAP 3/4 100’ RoHS:否 制造商:Panduit 產(chǎn)品:Cable Wraps 類型:Spiral 顏色:Black 材料:PP 內(nèi)徑:0.03 in 長度:100 ft |
| T75F-C0 | 功能描述:非熱縮管和套管 Spiral Wrap Poly .75" x 100’ RoHS:否 制造商:Panduit 產(chǎn)品:Cable Wraps 類型:Spiral 顏色:Black 材料:PP 內(nèi)徑:0.03 in 長度:100 ft |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。