MC68194(2006) Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

MC68194
(Rev.:2006)

Carrier Band Modem (CBM)

ON Semiconductor 

MC68194

Signal Description (Cont.)

Symbol

Type Name/Description

RXIN, RXIN*

I

RECEIVER INPUTS — A differential input signal pair for the receiver amplifier/limiter.

These inputs may be used differentially or single ended.

FDBK, FDBK*

DC FEEDBACK BYPASS — These two points are provided to bypass dc feedback

around the receiver amplifier.

THRESHOLD

I

THRESHOLD ADJUST — The receiver threshold detect is trimmed with this pin.

GAIN

O GAIN — This output can be used to monitor the receiver amplifier output signal. Used

only for test purposes.

CARDET

O CARRIER DETECT — This output can be used to filter the internal signal that is

sampled to sense carrier detect.

RPW, CPW

I

PULSE−WIDTH RESISTOR/CAPACITOR — A resistor and capacitor set a one−shot

pulse width used in the clock recovery circuitry.

SET−PW

O PULSE WIDTH TEST POINT — Output test point used for adjusting clock recovery

one−shot pulse width.

UP*, DOWN*

ECL/O

PLL PHASE DETECTOR OUTPUTS — UP* and DOWN* are the pump−up and

pump−down outputs, respectively, of the PLL digital phase detector. They are MECL

levels referenced to +5.0 volts and are used to drive inputs to an active filter or charge

pump for the PLL.

VCX

I

VCM CONTROL — The control voltage applied to the PLL voltage controlled

multivibrator.

VCM−C1, VCM−C2

I

VCM CAPACITOR — VCM capacitor inputs. VCM frequency is 4X RXCLK.

JAB−RC

I

JABBER−INHIBIT RC — A resistor−capacitor network connected to this pin sets the

jabber−inhibit time constant.

XTAL,1 XTAL2

I

CLOCK CRYSTAL — Oscillator circuit inputs may be used with a crystal or an external

clock source. Oscillator frequency is 4X data rate.

VCC−VCM

VCC−TXOUT

VCC−OSC

VCC−RCV

VCC

VCC−TTL

GND−TTL, GND−VCM,

GND−LOGIC, GND−OSC,

GND−RCV, GND−SUBS, GND

VCM POWER — 5.0 ± 5% volts for VCM.

TXOUT POWER — 5.0 ± 5% volts for TXOUT/TXOUT*.

OSCILLATOR POWER — 5.0 ± 5% volts for oscillator.

RECEIVER POWER — 5.0 ± 5% volts for receiver amplifier/limiter.

LOGIC POWER — 5.0 ± 5% volts for remaining logic.

TTL POWER — 5.0 ± 5% volts for TTL output buffers.

GROUND — Reference voltage for TTL buffers, VCM, internal logic, oscillator, receiver/

limiter, substrate respectively. Two additional grounds are used to isolate signals.

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