HC5514XEVAL3【PDF 1/10 页】EVAL BOARD TI CODEC MOTHER BOARD

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Operation of the UniSLIC14 Family of SLICs

Evaluation Board

Application Note

February 2001

AN9871.1

Functional Description

Evaluation Board

The HC5514X evaluation board, due to the common pinout

of the UniSLIC14 family, is capable of evaluating the

performance of the following parts in the UniSLIC14 family

(HC55120, HC55121, HC55130, HC55140, HC55142 and

HC55150).

This evaluation board also has provisions for the evaluation

of the 758XX Access Switch, which is not covered in this

application note. For information about the operation of the

Access Switch reference application note AN9870

“Operation of the 758XX Line Card Access Switch”.

The sample provided with this board (HC5514X) will

illustrate the electrical performance for all members of the

family listed above. The board is con?gured to match a 600 ?

line impedance, have a minimum loop current of 20mA, a

maximum loop current of 30mA, onhook transmission of

0.775V RMS , offhook voice transmission of 3.2V PEAK , and a

maximum loop resistance of 1777 ? .

For evaluation of the programmability of the HC5514 family,

reference the data sheet for calculation of external

components. An Excel spread sheet can be downloaded

from the web for easy calculation of external components

(www.intersil.com/telecom/unislic14.xls).

The board is equipped with eleven Single Pole Double Throw

(SPDT) switches. The switches control the logic state and

performance of the HC5514 and the 758XX Access Switch.

The logic control (C3, C2, C1), SHD and GKD/LVM switches

are center open toggle switches. If off-board mode control of

the SLIC is desired, these switches can be set to center

open position and driven by logic at the logic terminal port.

The logic terminal port is located at the bottom right hand

side of the board.

The logic control for the Access Switch (lower left hand side

of the board) can also be set to center open position and

driven by logic at the logic terminal port if desired.

Power Requirements for the HC5514X

Power Supply Connections

The HC5514X requires as many as three external power

supplies. V BH = -48V (Typ), V BL = -24V (Typ) and V CC =

+5V. If the design requires only two supplies, it is

recommended that the V BL supply pin ?oat.

Ground Connections

The three external power supplies should each be grounded

at the evaluation board.

Features

? Toggle Switch Programming for Logic States

? Monitoring of Switch Hook Detect (SHD) and Ground Key /

Line Voltage Measurement (GKD_LVM) via On Board LEDs

? Selectable Transmit Gain 0dB/-6dB

? Selectable Power Sharing

? Single/Dual Battery Operation

? Logic Terminal Port for Easy Evaluation in Existing

Systems

? Includes a Ring Relay for Evaluation of Ring Trip and

Provisions for Evaluation of Intersil’s 758XX Linecard

Access Switch

? Selectable/Programmable Polarity Reversal Time

? Programmable 2-Wire Impedance

? Programmable Loop Detect Threshold

? Programmable Onhook and Offhook Overheads

? Provisions for Pulse Metering

? Provisions for Internal Transhybrid Balance

? Provisions for Line Voltage Measurement Test

Getting Started

Verify that the sample is oriented in its socket correctly.

Correct orientation is with pin 1 pointing towards the top of

the board (tip and ring terminals to the left). (Reference the

data sheet for device pinout.)

Verifying Basic SLIC Operation

The operation of the sample part can be veri?ed by

performing the following tests: (The board comes with a

standard ring relay. The following set of tests, evaluate the

operation of the HC5514X with the ring relay.)

1. Power Supply Current Veri?cation

? Forward Active and Reverse States

2. Normal Loop Feed Veri?cation

? Forward Active and Reverse Active States

3. Gain Veri?cation

? 4-Wire to 2-Wire and 2-Wire to 4-Wire

4. Polarity Reversal Time

5. Battery Selection/Power Sharing

6. Ring Trip Veri?cation

7. Pulse Metering

8. Transhybrid Balance

9. Line Voltage Measurement Test

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Americas Inc.

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