MC68194FJ Просмотр технического описания (PDF) - ON Semiconductor

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MC68194FJ

Carrier Band Modem (CBM)

ON Semiconductor 

MC68194

Signal Description (Cont.)

Symbol

RXIN, RXIN*

FDBK, FDBK*

THRESHOLD

GAIN

CARDET

RPW, CPW

SET–PW

UP*, DOWN*

Type

I

I

O

O

I

O

ECL/O

VCX

I

VCM–C1, VCM–C2

I

JAB–RC

I

XTAL,1 XTAL2

I

VCC–VCM

VCC–TXOUT

VCC–OSC

VCC–RCV

VCC

VCC–TTL

GND–TTL, GND–VCM,

GND–LOGIC, GND–OSC,

GND–RCV, GND–SUBS, GND

Name/Description

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

These inputs may be used differentially or single ended.

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

around the receiver amplifier.

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

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

only for test purposes.

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

sampled to sense carrier detect.

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

pulse width used in the clock recovery circuitry.

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

one–shot pulse width.

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.

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

multivibrator.

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

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

jabber–inhibit time constant.

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

clock source. Oscillator frequency is 4X data rate.

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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