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參數(shù)資料
| 型號(hào)： | T7570 |
| 廠商： | Lineage Power |
| 元件分類(lèi)： | 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(yè)數(shù)： | 25/28頁(yè) |
| 文件大?。?/td> | 489K |
| 代理商： | T7570 |
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25
Lucent Technologies Inc.
Data Sheet
October 1996
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Applications
Figure 7 illustrates a T7570 codec interfaced to a Lucent L7554 SLIC. Interface components were chosen for a
basic 600
resistive only termination and balance network. Overall receive path gain is 0 dB (PCM to T/R). Overall
transmit path gain is –2 dB (T/R to PCM). Codec receive gain is 0 dB. The signal level returned to VF
X
I is
–3.658 dBm. This satisfies the transmission level point requirement for hybrid cancellation. That is, the signal at
VF
X
I relative to the output at VF
R
O must be within –2.5 dB to –10.25 dB. Transmit gain of the codec is set at
+1.658 dB in order to achieve a transmission level point at Dx of –2 dBm.
Transmit and receive paths are capacitively coupled to accommodate different SLIC and codec bias levels. The
codec’s inputs are self-biased so that no additional external resistors are necessary with ac coupling. Capacitor
values are sized appropriately to pass low-frequency requirements of relevant gain versus frequency templates.
Resistive values were ascertained from SLIC documentation.
An optional 20 k
resistor from RCVN to ground and a 30 pF capacitor across RGP can be added for stability.
Gain and hybrid-balance register values are shown in hex. Gain values were obtained from Tables 8 and 9. Hybrid-
balance values were obtained by removing the codec and inserting a network analyzer to measure the phase and
gain returned by the loop to VF
X
I when a signal is injected at VF
R
O. Gain and phase are then measured at 14 fre-
quencies. The results obtained from this exercise are plugged into the hybrid-balance software that provides the
register settings as shown.
5-4716.a C
Figure 7. 600
Resistive SLIC Interface
Register Settings
Register
RX GAIN
TX GAIN
HYBRID 1
HYBRID 2
HYBRID 3
Register Number Value
04
05
06
07
08
Description
AE
AE
A4
51
88
0 dB
1.658 dB
—
—
—
L7554
RGP
20 k
CC1
0.47 μF
VITR
CRCV1
0.1 μF
VF
X
I
VFRO
2.4 V
SEE REGISTER
SETTINGS
BELOW
T7570
RRCV
48.7 k
RT1
86.6 k
RCVN
RCVP
RPT
35
TZ
600
RPT
35
SLIC
CODEC
PT
PR
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