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LUCL9214ARG-D 参数 Datasheet PDF下载

LUCL9214ARG-D图片预览
型号: LUCL9214ARG-D
PDF下载: 下载PDF文件 查看货源
内容描述: 低成本振铃SLIC [Low-Cost Ringing SLIC]
分类和应用: 电池电信集成电路
文件页数/大小: 46 页 / 750 K
品牌: AGERE [ AGERE SYSTEMS ]
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L9214A/G  
Low-Cost Ringing SLIC  
Preliminary Data Sheet  
October 2001  
ac Applications (continued)  
Design Examples (continued)  
ac Interface Using First-Generation Codec (continued)  
RTGS CGS  
Rx  
RGX = 4750 Ω  
IT/R  
318.25  
0.1 µF  
RT6  
20  
+
VTX  
TXI  
VITR  
CODEC  
OP AMP  
CN  
RT3  
RHB  
RN1  
RCVN  
RCVP  
CODEC  
OUTPUT  
DRIVE  
AMP  
RRCV  
RN2  
RGP  
5-6400.H (F)  
Figure 15. Interface Circuit Using First-Generation Codec (Blocking Capacitors Not Shown)  
Transmit Gain  
Using REQ, calculate the desired transmit gain, taking  
into account the impedance transformation:  
Transmit gain will be specified as a gain from T/R to  
PCM, TX (dB). Since PCM is referenced to 600 and  
assumed to be 0 dB, and in the case of T/R being refer-  
enced to some complex impedance other than 600 Ω  
resistive, the effects of the impedance transformation  
must be taken into account.  
600  
REQ  
TX (dB) = TX (specified[dB]) + 20log ----------  
TX (specified[dB]) is the specified transmit gain. 600 is the  
impedance at the PCM, and REQ is the impedance at  
600  
REQ  
Tip and ring. 20log ---------- represents the power  
Again, specified complex termination impedance at T/R  
is of the form:  
loss/gain due to the impedance transformation.  
R2  
Note in the case of a 600 pure resistive termination  
600  
600  
R1  
at T/R 20log ---------- = 20log --------- = 0.  
REQ 600  
C
Thus, there is no power loss/gain due to impedance  
transformation and TX (dB) = TX (specified[dB]).  
5-6396(F)  
First, calculate the equivalent resistance of this network  
at the midband frequency of 1000 Hz.  
Finally, convert TX (dB) to a ratio, gtx:  
TX (dB) = 20log gtx  
REQ =  
2
2
2
2
2
2
(2 πf) C1 R1R22 + R1 + R2  
2 πfR2 C1  
The ratio of RX/RT6 is used to set the transmit gain:  
-----------------------------------------------------------------------------  
--------------------------------------------------  
+
2
2
2
2
2
2
1 + (2 πf) R2 C1  
1 + (2 πf) R2 C1  
RX  
RT6  
318.25  
20  
1
M
----------  
= gtx ----------------- ---- with a quad Agere codec  
such as T7504:  
RX < 200 kΩ  
Agere Systems Inc.  
35  
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