PCE84C886 datasheet(13/56 Pages) PHILIPS

13 / 56 page

1996 Jan 08

Philips Semiconductors

Preliminary speciﬁcation

Microcontroller for monitor OSD

and auto-sync applications

PCE84C886

Fig.10 Fine adjustment output (OUT2).

handbook, full pagewidth

MLC755

t sub0

t sub16

t sub32

t sub48

t sub64

t sub80

t sub96

t sub112

t sub127

t r

111 1110

111 1011

111 1010

PWM8L

7.3

A typical PWM output application

A typical PWM application is shown in Fig.11. The buffer is

used to reduce jitter on the OSD. R1 and C1 form the

integration network the time constant of which should be

equal to or greater than 5 times the repetition period of the

PWM output pattern. In order to smooth a changing PWM

output a high value of C1 should be chosen. The value of

C1 will normally be in the range 1 to 10

µF. The potential

divider chain formed by R2 and R3 is used only when the

output voltage is to be offset. The output voltages for this

application are calculated using Equations (1) and (2).

(1)

(2)

The loop from the PWM pin through R1 and C1 to VSS will

radiate high frequency energy pulses. In order to limit the

effect of this unwanted radiation source, the loop should

be kept short and a high value of R1 selected. The value

of R1 will normally be in the range 3.3 to 100 k

Ω. It is good

practice to avoid sharing VSS (pin 21) with the return leads

of other sensitive signals.

max

supply voltage

----------------------

----------------------------------------------------

min

----------------------

supply voltage

----------------------

-------------------------------------------------------------------

Fig.11 Typical PWM output circuit.

handbook, halfpage

MLC070

PCE84C886

PWMn

VSS

supply

voltage

analog

output

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