SAA7103 datasheet(70/76 Pages) PHILIPS

70 / 76 page

2001 Sep 25

Philips Semiconductors

Product speciﬁcation

Digital video encoder

SAA7102; SAA7103

handbook, halfpage

MHB912

2.7

µH

120 pF

C16

JP11

JP12

FIN

FOUT

C10

390 pF

C13

560 pF

2.7

µH

FILTER 1

= byp.

ll act.

AGND

Fig.16 FLTR0, FLTR1 and FLTR2 of Fig.15.

12.1

Analog output voltages

The analog output voltages are dependent on the total

load (typical value 37.5

Ω), the digital gain parameters and

the I2C-bus settings of the DAC reference currents (analog

settings).

The digital output signals in front of the DACs under

nominal (nominal here stands for the settings given in

Tables 53 to 60 for example a standard PAL or NTSC

signal) conditions occupy different conversion ranges, as

indicated in Table 112 for a 100

⁄100 colour bar signal.

By setting the reference currents of the DACs as shown in

Table 112, standard compliant amplitudes can be

achieved for all signal combinations; it is assumed that in

subaddress 16H, parameter DACF = 0000b, that means

the fine adjustment for all DACs in common is set to 0%.

If S-video output is desired, the adjustment for the C

(chrominance subcarrier) output should be identical to the

one for VBS (luminance plus sync) output.

Table 112 Digital output signals conversion range

SET/OUT

CVBS, SYNC TIP-TO-WHITE VBS, SYNC TIP-TO-WHITE

RGB, BLACK-TO-WHITE

Digital settings

see Tables 53 to 60

see Table 48

Digital output

1014

881

876

Analog settings

e.g. B DAC = 1FH

e.g. G DAC = 1BH

e.g. R DAC = G DAC = B DAC = 0BH

Analog output

1.23 V (p-p)

1.00 V (p-p)

0.70 V (p-p)

12.2

Suggestions for a board layout

Use separate ground planes for analog and digital ground.

Connect these planes only at one point directly under the

device, by using a 0

Ω resistor directly at the supply stage.

Use separate supply lines for the analog and digital supply.

Place the supply decoupling capacitors close to the supply

pins.

Use Lbead (ferrite coil) in each digital supply line close to

the decoupling capacitors to minimize radiation energy

(EMC).

Place the analog coupling (clamp) capacitors close to the

analog input pins. Place the analog termination resistors

close to the coupling capacitors.

Be careful of hidden layout capacitors around the crystal

application.

Use serial resistors in clock, sync and data lines, to avoid

clock or data reflection effects and to soften data energy.

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