Data Sheet
May 2001
L8576B Dual Ringing SLIC
Test Configurations (continued)
Applications
Characteristic Curves
Figures 11—16 display typical room temperature read-
ings.
100 µF
TIP
VS
365 Ω
365 Ω
+
BASIC
TEST CIRCUIT
VM
–
0
RING
100 µF
RECEIVE GAIN
–10
–20
HYBRID BALANCE
VS
LONGITUDINAL BALANCE = 20log ------
VM
–30
–40
–50
12-2584(F)b
Figure 8. Longitudinal Balance
–60
100k
ILONG
0.1k
1k
10k
FREQUENCY (Hz)
PT
+
12-3507(F)
VPT
–
Note: Gain is normalized to 0 dB.
BASIC
TEST CIRCUIT
–
Figure 11. Receive Gain and Hybrid Balance vs.
Frequency
ILONG
VPR
+
PR
∆ VPT
∆ ILONG
∆ VPR
∆ ILONG
ZLONG =
OR
0
12-2585(F).r1
–5
–10
–15
–20
–25
–30
–35
–40
–45
TRANSMIT GAIN
Figure 9. Longitudinal Impedance
RETURN LOSS
XMT
PT
+
BASIC
600 Ω
VT/R
TEST CIRCUIT
–50
–55
0.1k
–
RCV
PR
1k
10k
100k
VS
FREQUENCY (Hz)
12-3508
Note: Gain is normalized to 0 dB.
VXMT
VT/R
GXMT =
VT/R
VRCV
Figure 12. Transmit Gain and Return Loss vs.
Frequency
GRCV =
12-2587(F)
Figure 10. ac Gains
Agere Systems Inc.
15
AGERE [ AGERE SYSTEMS ]
