Data Sheet
March 1997
L7554 Low-Power SLIC
Applications (continued)
ac Design (continued)
ac equivalent circuits using a T7513 Codec are shown in Figures 32 and 33.
RX
VGSX
–0.4 V/mA
–
+
RT2
VFXIN
–
VITR
VFXIP
RT1
+
RCVN
RCVP
RHB1
–
ZT/R
RP PT 40 Ω
AV = 1
AV = 4
RRCV
VFR
+
IT/R
+
(PWROP)
VS
ZT
VT/R
–
RG
RP PR 40 Ω
AV = –1
L7554 SLIC
ATT7564 SLIC
T7513 CODEC
12-2554.a (C)
Figure 32. ac Equivalent Circuit Not Including Spare Op Amp
Z
T5
RX
VGSX
R
T4
XMT
–0.4 V/mA
VITR
–
+
–
+
R
T6
VFXIN
VFXIP
SN
AGND
–
+
RT3
R
HB1
RCVN
RCVP
–
Z
T/R
R
P
PT 40 Ω
PR 40 Ω
A
V
= 1
AV = 4
RRCV
VFR
+
I
T/R
+
V
–
(PWROP)
VS
Z
T
T/R
RGN
RP
AV
= –1
L7554 SLIC
T7513 CODEC
12-3013 (C)
Figure 33. ac Equivalent Circuit Including Spare Op Amp
Lucent Technologies Inc.
25
AGERE [ AGERE SYSTEMS ]
