Product Specification

SP42742

Page 4 of 10

Figure 4. Typical Application (1 of 4)

Table 7. Truth Table

C1 (pin 17)

C2 (pin 16)

RFC – RF1

RFC – RF2

OFF

Low

Low

ON

OFF

ON

Low

Low

ON

OFF

ON

Low

High

OFF

ON

ON

High

Low

OFF

ON

ON

High

High

ON

OFF

Note: A versatile logic table has been established to allow either C1 or C2

act as a single pin control and in either polarity.

Typical Applications

The SP42742 provides the high isolation required

by FCC part 15.115 regulation between the

television antenna and the cable plant. The

advantage of the SP42742 is that device

isolation / thru performance is maintained when

power is removed. This unique feature makes the

SP42742 ideal for set-top box and VCR

applications. The SP42742 supports signal flow

from RFC to RF1 and RF2 termination in the

unpowered state; similar to the powered state with

C1=C2 (both high or low).

DTV-Tuner

SP42742

SPDT

DTV Tuner

Antenna Input

CATV Input

80dB 54 – 216MHz

60dB 216 – 550MHz

55dB 550 – 806MHz

Power

Splitter

Power

Splitter

SP42742

SPDT

Dual Tuner DTV / DVR / Set-top Box

Television

RF

Splitter

Antenna/Cable

Input

PVR/VCR/Game Box

SP42742

SPDT

Tuner/

Modulator

OFF – Pass Through

Tuner

CATV Input

OFF – Terminated

TV Set / Cable Set-top Box

75

SP42742 SPDT

Figure 5. Typical Application (2 of 4)

Figure 7. Typical Application (4 of 4)

Figure 6. Typical Application (3 of 4)

DTV-Tuner

SP42742

SPDT

Antenna Input

CATV Input

80dB 54 – 216MHz

60dB 216 – 550MHz

55dB 550 – 806MHz

Tel: +86-23-62808818

Fax: +86-23-62805284

www.sipatsaw.com / sawmkt@sipat.com