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PDF AM7945 Data sheet ( Hoja de datos )
| Número de pieza | AM7945 | |
| Descripción | (AM7943 - AM7945) SLIC Evaluation Board User Guide | |
| Fabricantes | AMD | |
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Hay una vista previa y un enlace de descarga de AM7945 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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www.DataSheet4U.com Am7943/44/45 SLIC
mEvaluation Board
oUser’s Guide
.c1999
www.DataSheet4Uwww.DataSheet4U.com
1 page  
1.0
Figure 1
INTRODUCTION
The Am7943/44/45 SLIC Evaluation Board provides a platform to evaluate the different
capabilities of the Am7943/44/45 SLIC devices. The evaluation board’s two modes of operation,
INTERNAL and EXTERNAL, provide a flexible platform to evaluate each SLIC device. All digital
control signals and voice band signals have test points for easy probing. All user selectable
components are mounted on component carriers for easy modification where required. A surge
protection circuit, robust enough to meet Bellcore GR-1089-CORE specifications, is part of the
telephone interface. All power is brought to the board via a single-keyed connector. LEDs are
provided to indicate when the loop detect/ground-key (DET) and RINGOUT circuits are active or
non-active.
Detailed device explanations, operational circuit descriptions, and required formulas can be found
in the Linecard Products Data Book and the individual SLIC device data sheets.
The Am7943/44/45 SLIC evaluation board physical layout is shown in Figure 1.
Am7943/44/45 SLIC Evaluation Board User’s Guide
1
5 Page 
3.6
3.7
Figure 6
3.8
3.9
Loop Detect Threshold Setting (RD/CD)
The Loop Detect Circuit is a filter composed of a resistor (RD) and capacitor (CD) in parallel with
each other and in series with the RD pin. Component values for this circuit are chosen to set the
threshold and filter point for the off-hook detector to on-hook transition. Components are mounted
on CC1 (refer to Figure 6). The values are derived by the following formula, which is also
explained in the device data sheet:
CD = 0.5mS
RD
Where: 0.5 mS is the time constant
RD is a selected resistance
CD is the calculated capacitive value
Battery Feed Control and Setting (RDC1, CDC, RDC2)
The components for the loop current circuit of the evaluation board are set to provide a
programmed DC loop current (IL) of approximately 25 mA. The components for the loop current
are located on CC1. The visual placement of components on CC1 and the electrical equivalent
circuit are shown in Figure 6. They are shown here to facilitate their identification to the user
when being placed on the board.
CC1
CD [15nF]
RD [35.7K]
R14 [10.5K]
C2 [470nF]
R15 [10.5K]
CC1 Component Carrier
RSN
AGND
RDC
RDC1
CDC
RDC2
DC Feed Control Circuit
DA, DB, and RINGOUT Banana Jacks
External DA and DB input signals can be applied to the SLIC via the DA and DB banana jacks
when the top two switches of S1 are set to the switched position. The banana jacks are
incorporated to allow the user to connect to off-board custom-built ringing circuitry. Please be
aware that if the RINGOUT signal is switched to this banana jack the user can no longer control
the relay K1.
The Ring Source input from the PW1 connector can be used to supply an off-board ring signal to
relay K1. The ring signal is applied to the unbalanced ring circuit composed of resistors R1, R2,
R3, R4, R5; and capacitors C12 and C14. The unbalanced ring circuit is used to set the on board
DA and DB inputs of the SLIC device.
LED Indicators
LED indicators are provided to monitor the various SLIC outputs.
LED
1
2
On
DET Low
RINGOUT Low
Off
DET High
RINGOUT High
Am7943/44/45 SLIC Evaluation Board User’s Guide
7
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AM7945.PDF ] | |
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