INDT165B 查看數據表（PDF） - Unspecified

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INDT165B

Long Distance Digital Display Link Transmitter & Receiver

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Data Sheet

INDT/R165B

INDT/R330B

3 Electrical Specification

3.1 External Circuits

3.1.1 External Loop Filter Specification

The internal PLLs of the INDT165B/330B and the INDR165B/330B devices require an external RC loop filter (Figure 3.1).

R1

C R2

CAPx

CAPy

Figure 3.1: External Loop Filter Circuit

It is recommended to implement the 0-Ohm resistors R1 and R2 for the transmitter as real components, because their

values may change in future versions. Table 3.1 shows the optimal values for the INDT/R165B, Table 3.2 for the

INDT/R330B. It is recommended to use SMD ceramic chip capacitors and chip resistors.

Link

PLL0

Signals

CAP1

CAP2

Pins

C11

C12

Parameter

Loop Filter Capacitor

Loop Filter Resistor 1

Loop Filter Resistor 2

Symbol

C

R1

R2

Value Tx

(INDT165B)

1µF

0Ω

0Ω

Table 3.1: External Loop Filter Specification for INDT/R165B

Value Rx

(INDR165B)

1µF

47 Ω

47 Ω

Link

PLL0

PLL1

Signals

CAP1

CAP2

CAP3

CAP4

Pins

A15

B15

A8

B8

Parameter

Loop Filter Capacitor

Loop Filter Resistor 1

Loop Filter Resistor 2

Loop Filter Capacitor

Loop Filter Resistor 1

Loop Filter Resistor 2

Symbol

C

R1

R2

C

R1

R2

Value Tx

(INDT330B)

1µF

0Ω

0Ω

1µF

0Ω

0Ω

Table 3.2: External Loop Filter Specification for INDT/R330B

Value Rx

(INDR330B)

1µF

47 Ω

47 Ω

1µF

47 Ω

47 Ω

3.1.2 Serial Transmission Cable Interconnect

The serial lines have to be AC-coupled through 100 nF capacitors; RF ceramic capacitors shall be used. Values for R and

L are dependent on the type of cable.

TX0+

TX0–

TX1+

INDT

TX1–

RX2+

RX2–

Decoupling capacitor

Cable termination

R

L

Downstream

R

L

Only INDT/R 330

R

L

Upstream

RX0+

RX0–

RX1+

INDR

RX1–

TX2+

TX2–

Date: 2005-02-18 Revision: 1.1

Figure 3.2: Decoupling and Cable Termination

Page 16 of 41

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