DRP3510 datasheet(7/30 Pages) ETC

7 / 30 page

ADVANCE INFORMATION

DRX 3960A

Micronas

1.3.1. Initialization for Analog TV

The DRX 3960A is able to operate with different refer-

ence frequencies. If 20.25 MHz is used, REF_SW has

to be connected to ground; additionally, if a lower fre-

quency is used, SYN_REF (control register) has to be

set accordingly. If a higher frequency is used,

REF_SW has to be

connected to

VDVDD and

SYN_REF has to be set accordingly. In the 20.25 MHz

case, no I2C command is needed.

The standard which should be processed has to be set

via I2C bus.

Additional controlling is only needed if the default val-

ues for the remaining write registers are not applicable.

1.3.2. Multistandard Configuration for

B/G, L, I, D/K and M/N

In multistandard applications for B/G, L, I, D/K, and M/N,

the picture carrier frequency at the tuner output should

be 38.9 MHz. The sound carrier frequencies are below

in a distance corresponding to the transmission stan-

dard. Thus, all wanted channel components are within

the passband of the SAW and forwarded to the

DRX 3960A. The demodulated and filtered video sig-

nal will be available at the CVBS output and the down-

converted sound carriers will be available at the 2nd

SIF output.

1.3.3. Multistandard Configuration for L’

In the L standard, the band 1 channels (40 MHz to

65 MHz) have a different frequency configuration.

Their sound carriers are below the according picture

carrier. This sub-standard is called L’. In that case, the

picture carrier frequency at the tuner output should be

32.9 MHz. Using conventional tuners, the sound car-

rier frequencies in L’ at the tuner output are above the

picture carrier. Thus, again all wanted channel compo-

nents are within the passband of the SAW.

1.3.4. FM Radio

In FM radio applications, the tuner has to down-con-

vert the wanted channel to 32.4 MHz. Therefore, the

lower slope of the SAW frequency response rejects

adjacent carriers on one side of that channel. The

DRX 3960A further down-converts the wanted channel

to 5.5 MHz. After additional filtering, the signal is fed to

the 2nd SIF output.

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