ETC5054 datasheet(3/18 Pages) STMICROELECTRONICS

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PIN DESCRIPTION

Name

Type

DIP

and

PLCC

(**)

Fun ction

Description

VBB

Negative

Power Supply

VBB =– 5 V

± 5%.

GNDA

GND

Analog Ground

All signals are referenced to this pin.

VFRO

Receive Filter

Output

Analog Output of the Receive Filter

VCC

Positive Power

Supply

VCC =+ 5 V

± 5%.

FSR

Receive Frame

Sync Pulse

Enables BCLKR to shift PCM data into DR.FSR is an

8kHz pulse train. See figures 1,

2 and 3 for timing

details.

Receive Data

Input

PCM data is shifted into DR following the FSR leading

edge.

BCLKR/CLKSEL

Shift-in Clock

Shifts data into DR after the FSR leading edge. May

vary from 64 kHz to 2.048 MHz. Alternatively, may be

a logic input which selects either 1.536 MHz/1.544

MHz or 2.048 MHz for master clock in synchronous

mode and BCLKX is used for both transmit and receive

directions (see table 1). This input has an internal pull-

up.

MCLKR/PDN

Receive Master Clock

Must be 1.536 MHz, 1.544 MHz or 2.048 MHz. May be

asynchronous

with

MCLKX,

but

should

synchronous with MCLKX for best performance. When

MCLKR is connected continuously low,

MCLKX is

selected for all internal timing. When MCLKR is

connected continuously high, the device is powered

down.

MCLKX

Transmit Master Clock

Must be 1.536 MHz, 1.544 MHz or 2.048 MHz. May be

asynchronous with MCLKR.

BCLKXI

Shift-out Clock

Shifts out the PCM data on DX. May vary from 64 kHz

to 2.048 MHz, but must be synchronous with MCLKX.

Transmit

Data Output

The TRI-STATE

® PCM data output which is enabled

by FSX.

FSX

Transmit Frame

Sync Pulse

Enables BCLKX to shift out the PCM data on DX.FSX is

an 8 kHz pulse train. See figures 1, 2 and 3 for timing

details.

TSX

Transmit Time Slot

Open drain output which pulses low during the encoder

time slot. Recommended to be grounded if not used.

GSX

Gain Set

Analog output of the transmit input amplifier. Used to

set gain externally.

VFXI

–

Inverting Amplifier

Input

Inverting Input of the Transmit Input Amplifier.

VFXI

Non-inverting Amplifier

Input

Non-inverting Input of the Transmit Input Amplifier.

(*) I: Input, O: Output, S: Power Supply

(**) Pins 4,10,11 and 13 are not connected

TRI-STATE

®is a trademark of National Semiconductor Corp.

ETC5054 - ETC5057

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