EQCO875SC.HS datasheet, PDF - EEWORLD Datasheet

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EQCO875SC.HS: DescriptionDATACOM, ETHERNET TRANSCEIVER; CategoryWireless rf/communication Telecom circuit; File Size1MB，13 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

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EQCO875SC.HS Overview

DATACOM, ETHERNET TRANSCEIVER

EQCO875SC.HS Parametric

Parameter Name	Attribute value
Maker	Microchip
package instruction	HVQCCN,
Reach Compliance Code	compliant
JESD-30 code	S-XQCC-N16
length	4 mm
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	UNSPECIFIED
encapsulated code	HVQCCN
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Filter level	TS 16949
Maximum seat height	0.9 mm
Nominal supply voltage	3.3 V
surface mount	YES
Telecom integrated circuit types	ETHERNET TRANSCEIVER
Temperature level	INDUSTRIAL
Terminal form	NO LEAD
Terminal pitch	0.65 mm
Terminal location	QUAD
width	4 mm

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Engineering Information

EqcoLogic NV

Open your Eyes™

EQCO850SC-HS and EQCO875SC-HS

Single Coax Transceiver

for LVDS and Gigabit Ethernet applications

1.1

Features



1.2

Combined transmitter and receiver with an integrated equalizer to form a full-duplex

bidirectional connection over a single 50Ω coax cable (EQCO850SC-HS) or 75Ω coax cable

(EQCO875SC-HS)

Internal LVDS termination resistors for low external discrete count

Allows power distribution over the coax, on top of the data signals

Single 3.3 V supply

16-pin, 0.65 mm pin pitch, 4 mm QFN package

Pb-free and RoHS compliant

Applications

This solution is useful and economical for many markets and applications, including the following:



1.3

Camera networks - Home Security, Surveillance, industrial/inspection, medical cameras

Coax Cable-Distribution infrastructure

Typical Equalization Performance

Bit Rate

125Mbps

250Mbps

500Mpbs

1Gbps

40 m

30 m

25 m

15 m

EQCO850SC-HS range using

RG174 ( 2.8 mm)

RTK ( 2.8 mm)

70 m

60 m

40 m

25 m

RG58 ( 5 mm)

70 m

50 m

30 m

Table 1: Typical Equalization Performance

For other cable types, the length that can be reached in full-duplex may have maximally -12dB

insertion loss at 625 MHz, for a bit rate of 1.25 Gbps. Equalizer performance works up to much

higher levels in half-duplex. For lower bit-rates slightly longer cable lengths can be achieved.

EQCO850SC-HS works for 50 coax and the EQCO875SC-HS works for 75 coax. Everything is the same except the part number, the

used coax and the characteristic impedance of transmission lines and connectors between the chip and the edge of the boards. See

also section 5.1 about the typical application circuit.

DS-EQCO850SC-HS-2v0-2014-01-28

Page 1 of 13

Engineering Information

EQCO850SC

SDIp

SDIn

Input

Pre-Driver

Active Signal

Splitter/Combiner

SDIO

REF

EqcoLogic NV

Open your Eyes™

Transmit

wake-up

Detection

Equalizer

Core

SDOp

SDOn

RX Output

Driver

Figure 3: EQCO850SC-HS block diagram showing electrical connections

2.3.1

SDIp/SDIn

SDIp/SDIn together form a differential input pair. The serial data received on these pins will be

transmitted on SDIO. The Input Pre-Driver automatically corrects for variations in signal levels

and different edge slew rates at these inputs before they go into the Active Splitter/Combiner for

transmission over the coax.

SDIp and SDIn inputs are differentially terminated by 100 Ω on chip. The center of the 100 Ω is

connected to DGND with a 10 kΩ resistor for DC biasing. The inputs also have protection diodes

to ground for ESD purposes. Always AC-couple these inputs to the outputs of the LVDS driver.

A Transmit Wake-up detection circuit puts both the Input Pre-Driver and the Active Signal

Splitter/Combiner into a low power mode when no signal is detected on the SDIp/SDIn signal pair

(except in mode B, where transmit circuit is permanently ON).

2.3.2

SDIO/REF

The signal on the SDIO pin is the sum of the incoming signal (i.e. the signal transmitted by the

EQCO850SC-HS on the far end side of the coax) and the outgoing signal (i.e. the signal created

based on SDIp/SDIn). The far end signal is extracted by subtraction of the near end signal and it is

this voltage that the equalizer analyses and adaptively equalizes for level and frequency response

based on the knowledge that the originating signal is DC balanced and Run length encoded

before transmission.

The REF signal carries a precise anti-phase current to the transmit current on SDIO. REF must be

connected directly to AGND

at the connector

(see Figure ) via a resistor precisely matched to the

impedance of the coaxial cable used.

2.3.3

SDOp/SDOn

SDOp/SDOn together form a differential pair outputting the reconstructed far end transmit signal.

The EQCO850SC-HS uses LVDS drivers with source matching for a 100 Ω transmission line. This

LVDS signal can normally be connected (subject to input common mode requirements) directly to

the RX signal pair of a standard LVDS receiver.

2.3.4

CLK, SI

These pins are used for production test and/or reserved for future options. For normal operation

connect them to DGND as indicated in Table 1.

DS-EQCO850SC-HS-2v0-2014-01-28

Page 4 of 13

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