U6239B
2.9 GHz PLL for SAT TV Tuner with UNi-Bus
Description
The U6239B is a single-chip frequency synthesizer with
bidirectional I
2
C bus control and unidirectional 3-wire
bus control, developed for SAT TV-tuner and cable tuner
applications.
This IC contains an integrated preamplifier, a high
frequency prescaler, a reference divider with multiple
programmable divider ratios, a crystal oscillator, a phase/
frequency detector together with a charge pump, a tuning
amplifier and an analog-to-digital converter.
Features
D
2.9 GHz divide-by-16 prescaler integrated
D
UNi-BUS:
I
2
C bus and 3-wire bus
I
2
C bus software compatible to U6223B
3-wire bus software compatible to LC7215 (Sanyo)
4 bidirectional ports (open collector)
2 unidirectional ports (open collector)
5 level ADC or unidirectional port (open collector)
Address mode select function (AMS, Pin 3):
3 or 4 addresses selectable via Pin 10
D
3-wire bus mode:
4 unidirectional ports (open collector)
Lock output (open collector)
D
I
2
C bus mode:
D
Programmable reference divider
D
Low power consumption (typ. 5 V / 23 mA)
D
Electrostatic protection according to MIL-STD 883
Block Diagram
AS / ENABLE / P3
10
SCL 5
SDA 4
UNI–BUS
Control
11 P0/Lock
5–bit Latch
ADC
I/O
Ports
7–bit Latch
8–bit Latch
7–bit Latch
T1
9 P4
8 P5
7 P6 / ADC
6 P7
Vs 12
GND 15
Power–on
reset
POR
14–bit Shift Reg.
Sync
15–bit Latch
LOCK
T0
5I
RD1,2,3
OS
AMS
RFi
14
13
div. by 16
Prescaler
SET
15/14–bit
counter
RDS
divide by 256/512/off/1024
divide by 25/50/140/250
divide by 50/100/280/500
Phase
detector
Charge
pump
FR
FP
RDS / AMS 3
XTAL 2
Oscillator
16 VD
1 PD
9611809
Figure 1.
TELEFUNKEN Semiconductors
Rev. A3, 28-May-97
1 (15)
TEMIC [ TEMIC SEMICONDUCTORS ]
