SP5026 Datasheet, PDF (2/11 Pages) Zarlink Semiconductor Inc – 1.0GHz 3-Wire Bus Controlled Synthesizer

SP5026
1.0GHz 3-Wire Bus Controlled Synthesizer
Data Sheet
Features
• Complete 1.OGHz Single Chip System
• Dual Standard 62.5kHz or 31.25 kHz Step Size
• Low power Consumption (5V 40mA)
• Function Compatible with Toshiba TD6380 and
TD6381*
• Pin Compatible with SP5510^†
• Low Radiation
• Varactor Drive Amplifier Disable
• Charge Pump Disable
• Single Port 18/19 Bit Serial Data Entry
• Four Controllable Outputs
• ESD Protection^‡
† See notes on pin compatibility
‡ Normal ESD handling procedures should be observed
Applications
• Satellite TV when combined with SP4902 2.5GHz
Prescaler
• Cable tuning systems
• VCRs
DS5776
Issue 2
December 2002
Ordering Information
SP5026 DP
18-lead plastic package)
SP5026S MP
(16-lead miniature plastic package)
Description
The SP5026 is a programming variant of the SP5510,
allowing the design of one tuner with either 1²C bus or
3-wire bus format depending on which device is
inserted. The SP5026, when used with a TV varicap
tuner, forms a complete phase locked loop tuning
system. The circuit consists of a divider-by-8 prescaler
with its own preamplifier and at 5-bit programmable
divider controlled by a serially-loaded data register.
Four open-collector outputs, each independently
programmable, are included. The device has two
modes of operation, selected by the “mode select”
input. In mode 1, the comparison frequency is
7.8125kHz and the programmable divider MSB is
bypassed; mode 2 comparison frequency is
3.90625kHz. The comparison frequencies are both
obtained from a 4MHz crystal controlled on-chip
oscillator.
Figure 1 - Block Diagram
1