saa7110 NXP Semiconductors, saa7110 Datasheet - Page 28

• Manufacturer Part Number: saa7110
• Description: One Chip Front-end 1 Ocf1
• Manufacturer: NXP Semiconductors

Philips Semiconductors
15 CLOCK SYSTEM
15.1
The internal CGC generates the system clocks LLC, LLC2
and the clock reference signal CREF. The internally
generated LFCO (triangular waveform) is multiplied by
four via the analog PLL (including phase detector, loop
filter, VCO and frequency divider). The rectangular output
signals have a 50% duty factor.
1995 Oct 18
handbook, full pagewidth
One Chip Front-end 1 (OCF1)
Clock generation circuit
LFCO
BAND PASS
FC = LLC/4
DETECTION
CROSS
ZERO
Fig.18 Clock generation circuit.
DETECTION
PHASE
28
Table 4 System clock frequencies
CLOCK
XTAL
LLC2
LLC4
LLC8
LLC
DIVIDER
FILTER
LOOP
1/2
3.6875
50 Hz
14.75
7.375
26.8
29.5
SAA7110; SAA7110A
OSCILLATOR
FREQUENCY (MHz)
DIVIDER
DELAY
1/2
MGC837
Product specification
CREF
LLC
LLC2
24.545454
12.272727
6.136136
3.068181
60 Hz
26.8