M02140 datasheet(2/2 Pages) MA-COM

2 / 2 page

www.mindspeed.com/salesoffices

General Information: (949) 579-3000

Headquarters – Newport Beach

4000 MacArthur Blvd., East Tower

Newport Beach, CA 92660-3007

02140-BRF-001-A M04-0935

logo are trademarks of Mindspeed Technologies. All other trademarks are the prop-

erty of their respective owners. Although Mindspeed Technologies strives for accu-

racy in all its publications, this material may contain errors or omissions and is

subject to change without notice. This material is provided as is and without any

express or implied warranties, including merchantability, fitness for a particular

purpose and non-infringement.

Mindspeed Technologies shall not be liable for any

special, indirect, incidental or consequential damages as a result of its use.

Applications

• STM-64/OC-192 SDH/SONET

• SDH/SONET with single or double FEC

• 10G Ethernet

• 10G Fiber Channel

• XFP

Product Features

RLOS establishes a threshold voltage at the LOSSET pin. The input

signal develops a voltage at the RSSI pin. This voltage is propor-

tional to the input signal peak-to-peak value. The voltage at LOSSET

is internally compared to the voltage at the RSSI (V(RSSI)) pin.

When the voltage at V(RSSI) is less than V(LOSSET), LOS is asserted

(ST de-asserted) and will stay asserted until the input signal level

increases by a predefined amount of hysteresis. When the input

level increases by more than this hysteresis, LOS is

de-asserted (ST asserted)

When asserted, the active high PWDN pin forces the outputs to a

high state. This ensures that no data is propagated through the

system. The loss of signal detection circuit can be used to auto-

matically force the data outputs to a high state when the input

signal falls below the threshold. The function is normally used to

allow data to propagate only when the signal is above the user's

bit-error-rate requirement. It therefore inhibits the data outputs

toggling due to noise when there is no signal present ("squelch").

In order to implement this function, LOS should be connected to

the PWDN pin, thus forcing the data outputs to

VCC when the signal falls below the threshold.

The M02140 contains an accurate on-chip bias circuit requiring an

external 12.1 k–

Ω 1% resistor, R

REF, from pin IREF to ground to

define an on-chip reference current.

The output circuit is basically a differential pair with a tail current

of ITAIL. The load of the differential pair is formed by the parallel

combination of ROUT and RLOAD for high frequencies where the

output AC-coupling capacitor can be considered as a short circuit

(50 || 50 = 25

Ω).

The required minimum voltage swing sets ITAIL which determines

the output power consumption. The minimum voltage swing

depends on the application. Therefore, M02140 provides the user

the flexibility to optimize the voltage swing and the output power

consumption in his own application by setting ITAIL using an external

resistor (RAMPSET).

VCCP

VCCD

AMPSET

Level

Detector

Amplitude

Control

DIN

50W

OUT

Comparator

Threshold

Setting

Circuit

Biasing

PWDN

IREF

LOS

LOSSET

RSSI

DOUT

Limiting

Amplifier

CML

Buffer

CMOS

Buffer

M02140 Block Diagram

M02140 Datasheet(PDF) 2 Page - M/A-COM Technology Solutions, Inc.

M02140 Datasheet(HTML) 2 Page - M/A-COM Technology Solutions, Inc.

Html Pages

1 2

Datasheet Download

Link URL