am79r70 Advanced Micro Devices, am79r70 Datasheet - Page 17

• Manufacturer Part Number: am79r70
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

APPLICATION CIRCUIT
Note:
The input should be 50% duty cycle CMOS-compatible input.
REVISION SUMMARY
Revision A to Revision B
•
Trademarks
Copyright
AMD, the AMD logo and combinations thereof are trademarks of Advanced Micro Devices, Inc.
DSLAC and QSLAC are trademarks of Advanced Micro Devices, Inc.
Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
RING
Assumptions:
1. 1.25 CF
2. 25 mA I
3. 100 mA Ringing Current Limit
TIP
Minor changes were made to the data sheet style and format to conform to AMD standards.
R
R
FA
FB
Bat1
= 50
= 50
1.5 µF
1998 Advanced Micro Devices, All rights reserved.
LOOP
C
RT
BAT1
BAT2
K1
G
K2
61089
TISP
12 k
C
R
K1
K2
BX
RT2
A
A
D
D
1
= 2.2 nF
2
C
0.1 µF
0.1 µF
AX
515 k
R
18 nF
= 2.2 nF
C
4. 5.2 k High Battery Loop Threshold
5. 925
6. 600
RT1
HP
600
I. Application Circuit
RTRIP1
RTRIP2
A(TIP)
HPA
HPB
B(RING)
VBAT1
VBAT2
RYOUT1
RYOUT2
RYE
BGND
P R E L I M I N A R Y
Ringing Loop Threshold
Two-wire Impedance,
Z
L
SLIC Products
RINGIN
AGND/
DGND
RSGH
VNEG
RSGL
RDCR
B2EN
VCC
RSN
DET
VTX
RDC
RD
C1
C2
C3
D1
D2
E1
15 k
50 k
R
R
R
66 k
DC1
DCR1
R
T2
R
T1
D
C
T
+5 V
C
0.33 µF
SLEW
125 k
125 k
50 k
R
C
150 k
R
7. G
8. –67 V Vbat1, –24 V Vbat2
10 nF
open
R
DC2
C
DCR
SGH
820 nF
–5 V
SLEW
DC
42L
250 k
R
= 1
R
RX
open
SGL
R
DCR2
15 k
V
V
TX
See Note.
RX
BATTERY
GROUND
GROUND
GROUND
ANALOG
DIGITAL
17