saa5290 NXP Semiconductors, saa5290 Datasheet - Page 28

• Manufacturer Part Number: saa5290
• Description: Page Economy Teletext/tv Microcontroller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Clock generator
The oscillator circuit of the SAA5290 is a single-stage
inverting amplifier in a Pierce oscillator configuration. The
circuitry between OSCIN and OSCOUT is basically an
inverter biased to the transfer point. A crystal must be
used as the feedback element to complete the oscillator
February 1995
handbook, halfpage
One page Economy Teletext/TV
microcontroller
(1) The values of C1 and C2 depend on the crystal specification:
C1 = C2 = 2C
L
.
Fig.7 Oscillator circuit.
C1
C2
(1)
(1)
OSCGND
OSCOUT
OSCIN
MLC110
28
circuitry. It is operated in parallel resonance. OSCIN is the
high gain amplifier input and OSCOUT is the output. To
drive the SAA5290 externally OSCIN is driven from an
external source and OSCOUT is left open-circuit.
handbook, halfpage
Fig.8 Oscillator circuit driven from external source.
not connected
external clock
not connected
OSCGND
OSCOUT
OSCIN
Preliminary specification
MLC111
SAA5290