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參數(shù)資料
| 型號： | BU5071 |
| 文件頁數(shù)： | 11/30頁 |
| 文件大?。?/td> | 393K |
| 代理商： | BU5071 |
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HYBRID BALANCE FILTER
The Hybrid Balance Filter on COMBO IIG is a
programmable filter consisting of a second-order
Bi-Quad section, Hybal1, followed by a first-order
section, Hybal2, and a programmable attenuator.
Either of the filter sections can be bypassed if
only one is required to achievegood cancellation.
A selectable 180 degree inverting stage is in-
cluded to compensate for interface circuits which
also invert the transmit input relative to the re-
ceive output signal. The Bi-Quad is intended
mainly to balance low frequency signals across a
transformer SLIC, and the first order section to
balance midrange to higher audio frequency sig-
nals. The attenuatorcan be programmed to com-
pensate for VF
R
O to VF
X
I echos in the range
of -2.5 to – 8.5 dB.
As a Bi-Quad, Hybal1 has a pair of low frequency
zeroes and a pair of complex conjugate poles.
When configuring the Bi-Quad, matching the
phase of the hybrid at lowto midbandfrequencies
is most critical. Once the echo path is correctly
balancedin phase, the magnitudeof the cancella-
tion signal can be corrected by the programmable
attenuator.
The Bi-Quad mode of Hybal1 is most suitable for
balancinginterfaceswith transformershaving high
inductanceof 1.5 Henries or more. An alternative
configuration for smaller transformers is available
byconverting Hybal1to a simple first-order section
witha singlereallow frequencypole and0 Hzzero.
In this mode, the pole/zero frequencymay be pro-
grammed.
Many line interfaces can be adequatelybalanced
by use of the Hybal1 section only, in which case
the Hybal2 filter should be de-selected to bypass
it.
Hybal2, the higher frequencyfirst-order section,is
provided for balancing an electronic SLIC, and is
also helpful with a transformer SLIC in providing
additionalphase correction for mid and high-band
frequencies, typically 1 kHz to 3.4 kHz. Such a
correction is particularly useful if the test balance
impedanceincludes a capacitorof 100 nF or less,
such as the loaded and non-loaded loop test net-
works in the United States. Independent place-
ment of the pole andzero location is provided.
Bit
State
Function
7
0
Disable Hybrid Balance Circuit Completely.
No internal cancellation is provided.
*
1
Enable Hybrid BalanceCancellation Path
6
0
Phase of the internal cancellation signal assumes inverted phase of the echo
path from VF
R
O to VF
X
I.
1
Phase of the internal cancellation signal assumes no phase inversionin the line
interface.
5
0
Bypass Hybal 2 Filter Section
1
Enable Hybal 2 Filter Section
G4–G0
Attenuation Adjustment for the Magnitude of the Cancellation Signal. Range is
– 2.5 dB (00000) to – 8.5 dB (11000)
Table 9:
Hybrid BalanceRegister1 Byte 2 Instruction.
Notes:
1. Maximum level into300
; 2. Maximum level into 600
;
3.R
L
≥
15K
(*) State at power on initialization
(*) State at poweron initialization
Setting = Please refer to software TS50772
Bit Number
0dBm0 Test Leve at VF
R
0
In dBm (Into 600
)
7
6
5
4
3
2
1
0
In Vrms (approx.)
0
0
0
0
0
0
0
0
No Output
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
– 17.3
– 17.2
0.106
0.107
1
0
1
0
1
1
1
0
0
0.775
1
1
1
1
0
0
1
1
+ 6.9 (note 1)
1.71
1
1
1
1
1
0
1
0
+ 7.6 (note 2)
1.86
1
1
1
1
1
1
1
1
+ 8.1 (note 3)
1.07
Table 8:
Byte 2 of Receive Gain Instructions.
TS5070 - TS5071
11/30
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PDF描述 |
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| BU508AD | TRANSISTOR | BJT | NPN | 700V V(BR)CEO | 8A I(C) | TO-218AC |
| BU508DR | TRANSISTOR | BJT | NPN | 700V V(BR)CEO | 8A I(C) | TO-218VAR |
| BU508FI | TRANSISTOR | BJT | NPN | 700V V(BR)CEO | 5A I(C) | TO-218 |
| BU508DFI | HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORS |
| BU508AF | NPN POWER TRANSISTORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| BU507-1 | 制造商:Thomas & Betts 功能描述:2 1/2 BUSHING,RGD/IMC,NM,INSUL,EA |
| BU-5076-C-24-0 | 功能描述:測試插頭和測試插座 Black BNC Male to Bl RoHS:否 制造商:Johnson / Emerson Connectivity Solutions 設(shè)備類型:Binding Posts 類型:Threaded stud 顏色:Black 電流額定值:15 A 觸點(diǎn)電鍍:Silver |
| BU-5076-C-36-0 | 功能描述:測試插頭和測試插座 Black BNC Male to Bl RoHS:否 制造商:Johnson / Emerson Connectivity Solutions 設(shè)備類型:Binding Posts 類型:Threaded stud 顏色:Black 電流額定值:15 A 觸點(diǎn)電鍍:Silver |
| BU-5076-C-48-0 | 功能描述:測試插頭和測試插座 Black BNC Male to Bl RoHS:否 制造商:Johnson / Emerson Connectivity Solutions 設(shè)備類型:Binding Posts 類型:Threaded stud 顏色:Black 電流額定值:15 A 觸點(diǎn)電鍍:Silver |
| BU-5078-C-24-0 | 功能描述:測試插頭和測試插座 Black BNC Male to Go RoHS:否 制造商:Johnson / Emerson Connectivity Solutions 設(shè)備類型:Binding Posts 類型:Threaded stud 顏色:Black 電流額定值:15 A 觸點(diǎn)電鍍:Silver |
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