|
|
PDF AM7945 Data sheet ( Hoja de datos )
| Número de pieza | AM7945 | |
| Descripción | Subscriber Line Interface Circuit | |
| Fabricantes | AMD | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AM7945 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
Am7945 et4U.comSubscriber Line Interface Circuit
SheDISTINCTIVE CHARACTERISTICS
tas Programmable constant-current feed
.Das Current gain = 200
ws Programmable loop-detect threshold
ws Low power Standby state
ws Ground-key detector
ms Tip Open state for ground-start lines
os –19 V to –56.5 V battery operation
U.cBLOCK DIAGRAM
TMG
s On-chip Thermal Management (TMG) feature
s Two-wire impedance set by single external
impedance
s On-hook transmission
s On-chip ring relay driver and relay snubber
circuit
s Ideal for low cost PABX and key telephone
systems
et4A(TIP)
SheHPA
ataHPB
w.DB(RING)
ww U.comDA
et4DB
eVBAT
ataShBGND
Two-Wire
Interface
Ground-Key
Detector
Signal
Transmission
Off-Hook
Detector
Power-Feed
Controller
Ring-Trip
Detector
Ring Relay
Driver
Input Decoder
and Control
RINGOUT
C1
C2
C3
E0
E1
DET
RSN
VTX
RD
RDC
CAS
VCC VEE AGND/DGND
ww.DPublication# 18408 Rev: D Amendment: /0
w Issue Date: October 1999
1 page  
ABSOLUTE MAXIMUM RATINGS
Storage temperature . . . . . . . . . . . . –55°C to +150°C
With respect to AGND/DGND:
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . .–0.4 V to +7.0 V
VEE. . . . . . . . . . . . . . . . . . . . . . . . . . .+0.4 V to –7.0 V
VBAT
Continuous . . . . . . . . . . . . . . . . . . +0.4 V to –70 V
10 ms . . . . . . . . . . . . . . . . . . . . . . +0.4 V to –75 V
BGND. . . . . . . . . . . . . . . . . . . . . . . . . . . .+3 V to –3 V
A(TIP) or B(RING) with respect to BGND:
Continuous . . . . . . . . . . . . . . . . . . . .–70 V to +1 V
10 ms (f = 0.1 Hz) . . . . . . . . . . . . . . . –70 V to +5 V
1 ms (f = 0.1 Hz) . . . . . . . . . . . . . . . . –80 V to +8 V
10 µs (f = 0.1 Hz) . . . . . . . . . . . . .–100 V to +12 V
Current from A(TIP) or B(RING). . . . . . . . . . ±150 mA
Current from TMG . . . . . . . . . . . . . . . . . . . . . 100 mA
Voltage on RINGOUT:
During transient . . . . . . . . . . . . . . BGND to +10 V
During steady state . . . . . . . . . . . . . BGND to +7 V
Current through relay drivers . . . . . . . . . . . . . . 60 mA
DA and DB inputs
Voltage on ring-trip inputs . . . . . . . . . . .VBAT to 0 V
Current into ring-trip inputs . . . . . . . . . . . . ±10 mA
C3–C1, E0, E1
to AGND/DGND . . . . . . . . . –0.4 V to VCC + 0.4 V
Maximum power dissipation, TA = 85°C
No heat sink (See note):
In 32-pin PLCC package. . . . . . . . . . . . . . . . 1.4 W
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . θJA
In 32-pin PLCC package. . . . . . . . . . . .43°C/W typ
Note: Thermal limiting circuitry on chip will shut down the cir-
cuit at a junction temperature of about 165°C. The device
should never be exposed to this temperature. Operation above
145°C junction temperature may degrade device reliability.
See the SLIC Packaging Considerations for more information.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent device failure. Functionality at or above
these limits is not implied. Exposure to Absolute Maximum
Ratings for extended periods may affect device reliability.
OPERATING RANGES
Commercial (C) Devices
Ambient temperature . . . . . . . . . . . . . . 0°C to +70°C*
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . .4.75 V to 5.25 V
VEE . . . . . . . . . . . . . . . . . . . . . . . . .–4.75 V to –5.25 V
VBAT . . . . . . . . . . . . . . . . . . . . . . . . . –19 V to –56.5 V
AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V
BGND with respect to
AGND/DGND . . . . . . . . . . . –100 mV to +100 mV
Load resistance on VTX to GND . . . . . . . . 10 kΩ min
The Operating Ranges define those limits over which the
functionality of the device is guaranteed by production testing.
* Functionality of the device from 0°C to +70°C is guaranteed
by production testing. Performance from –40°C to +85°C is
guaranteed by characterization and periodic sampling of pro-
duction units.
SLIC Products
5
5 Page 
State C3 C2 C1
0 000
1 001
2 010
3 011
4 100
5 101
6 110
7 111
Note:
E0 High enables DET.
Table 1. SLIC Decoding
2-Wire Status
DET Output
E1 = 1
E1 = 0
Open Circuit
Ringing
Active
Ring trip
Ring trip
Loop detector
Ring trip
Ring trip
Ground key
On-Hook TX (OHT)
Tip Open
Standby
Reserved
Reserved
Loop detector
Loop detector
Loop detector
Ground key
Ground key
Ground key
Table 2. User-Programmable Components
ZT = 200(Z2WIN – 2RF)
ZRX
=
---Z----L----
G42L
•
-----------------2---0---0-----•----Z----T------------------
ZT + 200(ZL + 2 • RF)
ZT is connected between the VTX and RSN pins. The fuse
resistors are RF, and Z2WIN is the desired 2-wire AC input
impedance. When computing ZT, the internal current amplifier
pole and any external stray capacitance between VTX and
RSN must be taken into account.
ZRX is connected from VRX to RSN. ZT is defined above, and
G42L is the desired receive gain.
RDC1
+
RDC2
=
---5---0---0----
ILOOP
CDC
=
1.5
ms
•
R-----D---C---1----+-----R----D---C---2-
RDC1 • RDC2
RDC1, RDC2, and CDC form the network connected to the RDC
pin. RDC1 and RDC2 are approximately equal. ILOOP is the
desired loop current in the constant-current region.
RD
=
3---7---5-- ,
IT
CD
=
0---.--5-----m-----s-
RD
IOHT
=
5---0---0------V------•----0---.--6---6-
RDC1 + RDC2
RD and CD form the network connected from RD to –5 V and
IT is the threshold current between on hook and off hook.
OHT loop current (constant-current region).
CCAS
=
--------------1---------------
3.4 • 105πfc
CCAS is the regulator filter capacitor and fc is the desired filter
cutoff frequency.
Thermal Management Equations (Normal Active and Tip Open States)
RTMG
≥
--V-----B---A---T------–----6-----V---
ILOOP
RTMG is connected from TMG to VBAT and is used to limit power
dissipation within the SLIC in Normal Active and Tip Open
states only.
PRTMG
=
--V-----B---A---T------–----6-----V------–----(---I--L----•----R----L----)--2
RTMG
Power dissipated in the TMG resistor, RTMG, during Active and
Tip Open states.
PSLIC = VBAT • IL – (PRTMG – RL(IL)2) + 0.12 W
Power dissipated in the SLIC while in Active and Tip Open
states.
SLIC Products
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AM7945.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AM7942 | Subscriber Line Interface Circuit | AMD |
| AM7945 | (AM7943 - AM7945) SLIC Evaluation Board User Guide | AMD |
| AM7945 | Subscriber Line Interface Circuit | AMD |
| AM7946 | Subscriber Line Interface Circuit | AMD |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |