Data Sheet
March 1997
L7554 Low-Power SLIC
Applications (continued)
Design Considerations
Table 11 shows the design parameters of the application circuit shown in Figure 11. Components that are adjusted
to program these values are also shown.
Table 11. 600 Ω Design Parameters
Design Parameter
Loop Closure Threshold
Parameter Value
10 mA
Components Adjusted
RLCTH
RPROG
RPT, RPR
—
dc Loop Current Limit
dc Feed Resistance
40 mA
183 Ω
2-wire Signal Overload Level
ac Termination Impedance
Hybrid Balance Line Impedance
Transmit Gain
3.14 dBm
600 Ω
RT1, RGP, RRCV
RHB1
600 Ω
0 dB
RT2, RX
Receive Gain
0 dB
RRCV, RGP, RT1
16
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
